JP5226399B2 - Power supply device and control method of power supply device - Google Patents

Description

  The present invention relates to a power supply apparatus having a configuration in which a plurality of switching power supplies are connected in parallel and a control method for the power supply apparatus.

  In a power supply device having a configuration in which a plurality of switching power supplies are connected in parallel, for example, as shown in Patent Document 1, it is connected in parallel with a droop characteristic that reduces the output voltage when the load current increases. Current sharing is performed by a plurality of switching power supplies.

  That is, FIG. 6 shows a conventional power supply apparatus having a configuration in which a plurality of switching power supplies are connected in parallel. In FIG. 6, each of the switching power supplies 101 a and 101 b includes two switching elements 111 and 112 each made of a MOSFET (Metal Oxide Field Effect Effect Transistor), an inductor 113, capacitors 114 and 115, a digital control circuit 116, and a driver 117. It consists of.

  A DC power source 120 is connected to the power input terminals 121 and 122. The power input terminal 121 is connected to the power output terminal 127 through the power line 123, the switching element 111, the power line 124, the inductor 113, and the power line 125. The power input terminal 122 is connected to the power output terminal 128 through the power line 126. A capacitor 114 is connected between the power supply line 123 and the power supply line 126. The switching element 112 is connected between the power supply line 124 and the power supply line 126. A capacitor 115 is connected between the power supply line 125 and the power supply line 126.

  The output voltage of each switching power supply 101a, 101b is sent to the digital control circuit 116. The digital control circuit 116 forms drive pulses for driving the switching elements 111 and 112 with an operation amount (duty ratio) based on the deviation between the output voltage and the reference voltage.

  The drive pulse from the digital control circuit 116 is supplied to the gates of the switching elements 111 and 112 via the driver 117. As a result, a power output of a desired output voltage is obtained from the power output terminals 127 and 128.

  The power output terminals 127 and 128 of the switching power supplies 101a and 101b are connected in parallel. A load 130 is connected to the switching power supplies 101a and 101b connected in parallel, and power is supplied to the load 130 from the switching power supplies 101a and 101b.

  In this case, if the output voltage of one of the switching power supplies 101a and 101b increases due to variations in the characteristics of the switching power supplies 101a and 101b, the load current is biased toward the current from the switching power supply with a high output voltage. For example, when the output voltage of the switching power supply 101a becomes higher than the output voltage of the switching power supply 101b, most of the current flowing through the load 130 is concentrated from the switching power supply 101a.

  Therefore, the switching power supplies 101a and 101b have a droop characteristic that detects the load current and decreases the output voltage when the load current increases. That is, the load current detection circuit 140 is provided in each of the switching power supplies 101a and 101b. The detected value of the load current is sent to the digital control circuit 116. The digital control circuit 116 realizes a droop characteristic by controlling so that the output voltage decreases when the detected value of the load current increases.

  For example, when the output voltage of the switching power supply 101a is higher than the output voltage of the switching power supply 101b, the output voltage of the switching power supply 101a is lowered by controlling the droop characteristic. When the output voltage of the switching power supply 101a decreases, the load current from the switching power supply 101a decreases and the load current from the switching power supply 101b increases. In this way, the current supplied to the load is shared by the plurality of switching power supplies 101a and 101b connected in parallel.

  FIG. 7 is a functional block diagram showing the operation of the conventional digital control circuit 116 for realizing the droop characteristic. In FIG. 7, the output voltage Vout is sampled by the output voltage sampling unit 151 and A / D converted. This output voltage Vout is supplied to the subtractor 152.

  In addition, the load current Iout from the load current detection circuit 140 is detected by the load current sampling unit 153. The detected value of the load current Iout is supplied to the reference voltage calculation unit 154. The reference voltage calculation unit 154 calculates the reference voltage according to the load current Iout. A reference voltage Vref is generated from the reference voltage generator 155 based on the voltage calculated by the reference voltage calculator 154. This reference voltage Vref is supplied to the subtractor 152.

  The subtractor 152 obtains a deviation E [n] (E [n] = Vref−Vout) between the reference voltage Vref and the output voltage Vout. The deviation E [n] is supplied to the operation amount calculation unit 156. The operation amount calculation unit 156 calculates an operation amount (duty ratio) according to the deviation E [n]. This operation amount is supplied to the driver 117, and a drive pulse based on this operation amount is supplied to the switching elements 111 and 112.

  When the load current Iout increases, the detected value of the load current Iout detected by the load current sampling unit 153 increases. When the detected value of the load current Iout increases, the set value of the reference voltage Vref from the reference voltage generator 155 is lowered. The subtractor 152 obtains a deviation E [n] between the reference voltage Vref and the output voltage Vout, and the manipulated variable computing unit 156 computes the manipulated variable so that the deviation E [n] becomes zero. For this reason, when the detected value of the load current Iout detected by the load current sampling unit 153 increases and the set value of the reference voltage Vref from the reference voltage generating unit 155 is lowered, the output voltage is lowered accordingly. The droop characteristic is realized.

FIG. 8 is a flowchart showing the operation of the conventional digital control circuit 116 described above. In FIG. 8, the load current Iout is detected in step S101. In step S102, the reference voltage Vref is corrected based on the detected value of the load current Iout. In step S103, the output voltage is detected, and in step S104, a deviation (E [n] = Vref−Vout) between the reference voltage Vref and the output voltage Vout is calculated. In step S105, an operation amount is calculated based on the deviation E [n], and in step S106, the operation amount is updated.
JP 2004-304960 A

  Thus, in the conventional power supply device in which the plurality of switching power supplies 101a and 101b are connected in parallel, the reference voltage Vref is changed so that the output voltage Vout decreases when the load current Iout is detected and the load current Iout increases. In this way, the droop characteristic is realized.

  However, in such a conventional power supply device, it is necessary to add a current detection circuit 140 even for a power supply that does not need to detect a load current. In such a conventional power supply device, the accuracy of the current detection circuit 140 is important. This is because if there is a variation in the detection current, the output voltage is determined by the load current, and the output voltage stability is also involved.

  In view of the above-described problems, the present invention is a power supply device in which a plurality of switching power supplies are connected in parallel and supplied to a load, and can realize a droop characteristic without detecting a load current and maintain a steady state. An object of the present invention is to provide a power supply apparatus and a control method for the power supply apparatus that can change the output voltage.

The present invention proposes the following items in order to solve the above-described problems.
(1) The present invention calculates a deviation between a reference voltage and an output voltage in a power supply device in which a plurality of switching power supplies are connected in parallel and power from the plurality of switching power supplies connected in parallel is supplied to a load. Means for calculating a correction amount of the operation amount of the switching element according to the deviation, means for realizing a droop characteristic by calculation from the correction amount of the operation amount,
The power supply device characterized by having this is proposed.

  According to the present invention, the deviation between the reference voltage and the output voltage is calculated, the correction amount of the operation amount of the switching element is calculated according to the deviation, and the droop characteristic is realized from the correction amount of the operation amount, whereby the current value Without detecting this, it is possible to realize a droop characteristic that reduces the output voltage as the load current increases while maintaining a stable state.

  (2) In the power supply device according to (1), the means for realizing the droop characteristic includes means for calculating a droop operation amount calculation function with respect to the previous operation amount, a correction amount of the operation amount, And a means for adding the previous manipulated variable calculated from the droop manipulated variable calculation function.

  According to this invention, the droop operation amount calculation function is calculated to the previous operation amount, the operation amount correction amount is added to the previous operation amount calculated from the droop operation amount calculation function, and the operation amount correction amount The operation amount is updated by the sum of the previous operation amount calculated from the droop operation amount calculation function. As a result, the sum of the operation amount correction amount and the previous operation amount does not change, and the output voltage can be changed while maintaining the steady state.

  (3) In the power supply device according to (1), the means for realizing the droop characteristic includes a means for calculating a droop manipulated variable calculation function for the current manipulated variable, a correction amount of the manipulated variable, The power supply device according to claim 1, further comprising: a means for adding the current operation amount obtained by calculating the droop operation amount calculation function.

  According to the present invention, the droop operation amount calculation function is calculated for the current operation amount, the operation amount correction amount is added to the current operation amount for which the droop operation amount calculation function is calculated, and the operation amount correction amount The operation amount is updated by the sum of the operation amount of the droop operation amount calculation function and the current operation amount. As a result, the output voltage can be changed while the steady state is maintained.

  (4) The present invention provides a control method for a power supply apparatus in which a plurality of switching power supplies are connected in parallel and power from the plurality of switching power supplies connected in parallel is supplied to a load. A first step of calculating a deviation; a second step of calculating a correction amount of an operation amount of the switching element according to the deviation; and a third step of realizing a droop characteristic by calculation from the correction amount of the operation amount. The control method of the power supply device characterized by including these is proposed.

  According to the present invention, the deviation between the reference voltage and the output voltage is calculated, the correction amount of the operation amount of the switching element is calculated according to the deviation, and the droop characteristic is realized from the correction amount of the operation amount, whereby the current value Without detecting this, it is possible to realize a droop characteristic that reduces the output voltage as the load current increases while maintaining a stable state.

  (5) In the power supply device control method according to (4), the third step includes a fourth step of calculating a droop operation amount calculation function to the previous operation amount, and a correction amount of the operation amount. And a fifth step of adding the previous manipulated variable obtained by calculating the droop manipulated variable calculating function, adding the corrected amount of the manipulated variable, and the previous manipulated variable obtained by calculating the droop manipulated variable calculating function. And a sixth step of updating the operation amount.

  According to this invention, the droop operation amount calculation function is calculated to the previous operation amount, the operation amount correction amount is added to the previous operation amount calculated from the droop operation amount calculation function, and the operation amount correction amount The operation amount is updated by the sum of the previous operation amount calculated from the droop operation amount calculation function. As a result, the sum of the operation amount correction amount and the previous operation amount does not change, and the output voltage can be changed while maintaining the steady state.

  (6) According to the present invention, in the method for controlling the power supply apparatus according to (4), the third step includes a seventh step of calculating a droop operation amount calculation function for the current operation amount, and a correction amount of the operation amount. And an eighth step of adding the current manipulated variable obtained by calculating the droop manipulated variable calculating function, a corrected amount of the manipulated variable, and a current manipulated variable obtained by calculating the droop manipulated variable calculating function. And a ninth step of updating an operation amount.

  According to the present invention, the droop operation amount calculation function is calculated for the current operation amount, the operation amount correction amount is added to the current operation amount for which the droop operation amount calculation function is calculated, and the operation amount correction amount The operation amount is updated by the sum of the operation amount of the droop operation amount calculation function and the current operation amount. As a result, the sum of the operation amount correction amount and the previous operation amount does not change, and the output voltage can be changed while maintaining the steady state.

  According to the present invention, the operation amount correction amount is calculated, the droop operation amount calculation function is calculated to the operation amount, and the operation amount correction amount is added to the operation amount calculated from the droop operation amount calculation function. Thus, it is possible to realize a droop characteristic that decreases the output voltage as the load current increases while maintaining the stable state without detecting the current value.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the constituent elements in the present embodiment can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the present embodiment does not limit the contents of the invention described in the claims.

<First Embodiment>
FIG. 1 shows a first embodiment of the present invention.
In this embodiment, two switching power supplies 1a and 1b are connected in parallel to supply power to a load 30. Here, the two switching power supplies 1a and 1b are connected in parallel. However, the number of switching power supplies to be connected in parallel is not limited to this, and any number of switching power supplies may be connected in parallel. It is the same.

  In FIG. 1, each switching power supply 1 a, 1 b is composed of two switching elements 11 and 12 made of MOSFETs, an inductor 13, capacitors 14 and 15, a digital control circuit 16, and a driver 17.

  A DC power supply 20 is connected to the power input terminals 21 and 22. The power input terminal 21 is connected to the power output terminal 27 through the power line 23, the switching element 11, the power line 24, the inductor 13, and the power line 25.

  The power input terminal 22 is connected to the power output terminal 28 through the power line 26. The capacitor 14 is connected between the power supply line 23 and the power supply line 26. The switching element 12 is connected between the power supply line 24 and the power supply line 26. The capacitor 15 is connected between the power supply line 25 and the power supply line 26.

  The output voltages of the switching power supplies 1a and 1b are sent to the digital control circuit 16. In the digital control circuit 16, a drive pulse for driving the switching elements 11 and 12 is formed with an operation amount (duty ratio) based on a deviation between the output voltage and the reference voltage.

  The drive pulse from the digital control circuit 16 is supplied to the gates of the switching elements 11 and 12 via the driver 17. As a result, a power output of a desired output voltage can be obtained from the power output terminals 27 and 28.

  The power output terminals 27 and 28 of the switching power supplies 1a and 1b are connected in parallel. A load 30 is connected to the switching power supplies 1a and 1b connected in parallel, and power is supplied to the load 30 from the switching power supplies 1a and 1b.

  In the digital control circuit 16, when the load current increases, a droop characteristic that lowers the output voltage is realized. In the first embodiment of the present invention, the droop characteristic is realized by calculating the droop characteristic from the operation amount correction amount and the previous operation amount. Due to the droop characteristic, a plurality of switching power supplies 1a and 1b connected in parallel share the current.

  At this time, in the first embodiment of the present invention, the droop operation amount calculation function is calculated with respect to the previous operation amount, and the operation amount correction amount and the previous operation amount with which the droop operation amount calculation function is calculated are calculated. Addition is performed so that the sum does not change so that the droop characteristic is realized and the steady state is maintained. This eliminates the need for a circuit that detects the load current. In addition, when calculating the droop operation amount calculation function, only the coefficient to be multiplied as the droop operation amount calculation function with respect to the previous operation amount is changed, so that the calculation time does not increase due to the addition of the droop function. .

  Next, the digital control circuit 16 in the first embodiment of the present invention will be described. FIG. 2 is a functional block diagram showing the configuration of the digital control circuit 16. In FIG. 2, the output voltage Vout is sampled by the output voltage sampling unit 51 and A / D converted. A reference voltage Vref is generated from the reference voltage generator 52. The subtractor 53 obtains a deviation E [n] (E [n] = Vref−Vout) between the reference voltage Vref and the output voltage Vout.

  The deviation E [n] obtained by the subtractor 53 is sent to the operation amount correction amount calculation unit 54. The operation amount correction amount calculation unit 54 calculates the operation amount correction amount ΔU based on the deviation E [n] between the reference voltage Vref and the output voltage Vout. The manipulated variable correction amount ΔU is sent to the adder 55.

  The droop manipulated variable calculator 56 calculates a droop manipulated variable calculation function P to the previous manipulated variable U [n−1] in order to provide a droop characteristic while maintaining a stable state. The droop operation amount calculation unit 56 calculates the droop operation amount calculation function P for the previous operation amount U [n−1], and the previous operation amount U [n−1] from which the droop operation amount calculation function P was calculated. Is sent to the adder 55.

  The operation amount correction amount ΔU from the operation amount correction amount calculation unit 54 and the previous operation amount (P × U [n−1]) in which the droop operation amount calculation function P from the droop operation amount calculation unit 56 is calculated. Are added by the adder 55. The output of the adder 55 is supplied as a drive pulse to the gates of the switching elements 11 and 12 via the driver 17.

  Thus, in the first embodiment of the present invention, the operation amount correction amount calculation unit 54 calculates the operation amount correction amount ΔU, and the droop operation amount calculation unit 56 calculates the previous operation amount U [n−1]. Then, the droop manipulated variable calculation function P is calculated, and the manipulated variable correction amount ΔU and the previous manipulated variable (P × U [n−1]) calculated by the droop manipulated variable calculation function P are added by the adder 55. As a result, the droop characteristic is realized while maintaining a stable state. How the droop characteristic is obtained in this way will be described below.

In general, in digital control, an operation amount is determined by calculating a correction amount from a newly obtained deviation and adding it to the previous operation amount. That is, if the previous operation amount is U [n−1], the previous deviation is E [n−1], and the current deviation is E [n], the current operation amount U [n] is the previous operation amount. Is added to U [n−1] by a correction amount (K ₀ × E [n] + K ₁ × E [n−1]) as follows.
_{U [n] = K 0 ×} E [n] + K 1 × E [n-1] + U [n-1] ... (1)
K ₀ is a proportional element, and K ₁ is an integral element.

In the steady state, the correction amount is zero, and the previous operation amount U [n−1] and the updated operation amount U [n] have the same value. That is, in the equation (1), the portion indicating the correction amount (K ₀ × E [n] + K ₁ × E [n−1]) is zero,
U [n] = U [n-1] (2)
It becomes.

The droop characteristic is changed so as to decrease the output voltage when the load current increases. In order to perform such control, it is conceivable to move the reference voltage Vref in accordance with U [n−1] the previous operation amount. However, if the reference voltage Vref is moved, the deviation (E [n] = Vout−Vref) changes, and the portion indicating the correction amount (K ₀ × E [n] + K ₁ × E [n−1]) Will not become zero, and the steady state cannot be maintained.

  The reason why the correction amount of the manipulated variable becomes zero in the steady state is that the deviation (E [n] = Vref−Vout) between the reference voltage and the output voltage is zero in the equation (1). The deviation E [n] converges to zero regardless of the load current. Therefore, the output voltage Vout approaches the reference voltage Vref, and control that changes the output voltage Vout by changing the deviation E [n] while maintaining a steady state is impossible. Become.

  In contrast, in this embodiment, the correction amount of the operation amount is changed while maintaining the steady state by correcting the previous operation amount so as to correspond to the correction amount of the operation amount, and the droop characteristic Is realized.

That is, in the above description, the condition that the manipulated variable is stable is described as the case where the manipulated variable correction amount (K ₀ × E [n] + K ₁ × E [n−1]) is zero. This is a case where the previous operation amount U [n−1] and the current operation amount U [n] are equal to each other and a stable steady state is obtained.

However, from equation (1), the sum K ₀ × E of the manipulated variable correction amount (K ₀ × E [n] + K ₁ × E [n−1]) and the previous manipulated variable U [n−1]. [N] + K ₁ × E [n−1] + U [n−1]
Even when is constant, the updated operation amount U [n] is constant and can maintain a steady state.

That is, even if the correction amount (K ₀ × E [n] + K ₁ × E [n−1]) is changed, the previous operation amount U [n−1] is changed and corrected so as to compensate for this. If the sum of the amount and the previous operation amount is not changed, the steady state can be maintained.

In this embodiment, as shown in the following equation (3), an operation using the droop operation amount calculation function P is performed on the previous operation amount U [n−1], and the operation amount correction amount and the droop operation are calculated. The operation amount using the amount calculation function P is added to the previous operation amount, and the sum is not changed so that the steady state is maintained. The droop operation amount calculation function is a function for performing an operation on the previous operation amount in order to realize the droop characteristic.
_{U [n] = K 0 ×} E [n] + K 1 × E [n-1] + P × U [n-1] ... (3)

  That is, the previous operation amount U [n−1] is multiplied by a coefficient P such as 0.9. In this case, the amount of correction constantly exists by an amount corresponding to 0.1, and it is possible to perform control such that the deviation E [n] is changed by that amount.

  In order to provide the droop characteristic, the value of the deviation E [n] must be changed depending on the load current. This problem also depends on the previous manipulated variable U [n−1] and the droop manipulated variable calculation function. This is solved by calculating P.

  That is, during operation, the operation amount is sequentially updated according to the load variation. For example, in the case of a buck converter, the operation amount is small when the load is light, and the operation amount is large when the load is heavy. That is, when the previous operation amount is multiplied by a coefficient as the droop operation amount calculation function P, the ratio between the correction amount and the previous operation amount does not change relatively, but the value of the correction amount, that is, the deviation is absolute. Will change. This characteristic makes it possible to provide a droop characteristic without detecting the load current.

In the functional block diagram shown in FIG. 2, the subtractor 53 obtains a deviation E [n] (E [n] = Vref−Vout) between the reference voltage Vref and the output voltage Vout, and an operation amount correction amount calculation unit 54. Thus, based on the deviation E [n], an operation amount correction amount ΔU is calculated as in the following equation.
ΔU = K ₀ × E [n] + K ₁ × E [n−1]

Further, the droop manipulated variable calculation unit 56 calculates the droop manipulated variable calculation function P to the previous manipulated variable U [n−1] as in the following equation.
P × U [n-1]

Then, in the adder 55, the operation amount correction amount ΔU (ΔU = K ₀ × E [n] + K ₁ × E [n−1]) from the operation amount correction amount calculation unit 54 is expressed as follows: The previous manipulated variable P × U [n−1] in which the droop manipulated variable calculation function P from the droop manipulated variable computing unit 56 is computed is added.
_{U [n] = K 0 ×} E [n] + K 1 × E [n-1] + P × U [n-1]

  As a result, the droop characteristic can be obtained while maintaining a steady state as shown in the above-described equation (3).

FIG. 3 is a flowchart showing the operation of the first embodiment of the present invention.
In FIG. 3, the output voltage Vout is detected in step S1, and in step S2, a deviation (E [n] = Vref−Vout) between the reference voltage and the output voltage is calculated. In step S3, an operation amount correction amount ΔU is calculated. The manipulated variable correction amount ΔU is a portion of (K ₀ × E [n] + K ₁ × E [n−1]) in the equation (3).

In step S4, the droop operation amount is calculated. The droop manipulated variable is a portion (P × U [n−1]) of the previous manipulated variable U [n−1] obtained by calculating the droop manipulated variable calculation function P in the expression (3). In step S5, based on the equation (3), the operation amount correction amount (K ₀ × E [n] + K ₁ × E [n−1]) and the previous operation amount calculated from the droop operation amount calculation function P are calculated. The operation amount is calculated by the sum of (P × U [n−1]). In step S6, the operation amount is updated based on this.

  FIG. 4 shows the operation amount U [n−1] obtained by multiplying the operation amount correction amount and the droop operation amount calculation function P by a coefficient of 1 or less as in the first embodiment of the present invention. When the droop characteristic is realized by calculation from the sum of the values (indicated by the curve A1), and when the current value of the conventional load current is detected and the reference voltage is changed to realize the droop characteristic (indicated by the curve B1). It is a comparison.

In FIG. 4, the horizontal axis represents the load current, and the vertical axis represents the output voltage.
As shown in FIG. 4, in the first embodiment of the present invention, the droop characteristic is calculated by calculating from the sum of the operation amount correction amount and the previous operation amount U [n−1] multiplied by a coefficient P of 1 or less. Therefore, as shown by the curve A1, a steady state is maintained and a stable droop characteristic can be realized. On the other hand, conventionally, the steady state cannot be maintained by changing the reference voltage, and the droop characteristic becomes unstable as shown by the curve B1.

<Second Embodiment>
FIG. 5 shows a second embodiment of the present invention.
In the first embodiment described above, the previous operation amount U [n−1] is multiplied by the droop operation amount calculation function P to maintain a steady state. In contrast, in the second embodiment, the current operation amount U [n] is multiplied by the droop operation amount calculation function P so as to maintain a steady state.

  In the second embodiment shown in FIG. 5, the output voltage Vout is sampled by the output voltage sampling unit 61, and the difference E [between the reference voltage Vref from the reference voltage generator 62 and the output voltage Vout is subtracted by the subtractor 63. n] (E [n] = Vref−Vout).

The operation amount correction amount calculation unit 64 calculates the operation amount correction amount ΔU based on the deviation E [n] as in the following equation.
ΔU = K ₀ × E [n] + K ₁ × E [n−1]

Further, the droop operation amount calculation unit 66 multiplies the current operation amount U [n] by the droop operation amount calculation function P.
P x U [n]

  Then, in the adder 65, the current operation amount (P × U [n]) multiplied by the droop operation amount calculation function P from the droop operation amount calculation unit 66 and the operation amount from the operation amount correction amount calculation unit 64. Is added to the correction amount ΔU.

  In the above-described embodiment, the duty ratio of the switching element is controlled according to the operation amount. However, the present invention is not limited to such control. All are effective for changing the operation amount according to the load. For example, in the frequency control, the operation amount is changed depending on the load, so that the same applies.

  The present invention is not limited to the above-described embodiments, and various modifications and applications can be made without departing from the gist of the present invention.

It is a block diagram of the power supply device of the 1st Embodiment of this invention. It is a functional block diagram used for description of the digital control circuit in the power supply device of the 1st Embodiment of this invention. It is a flowchart used for description of the droop control in the power supply device of the 1st Embodiment of this invention. It is a graph used for comparison with the droop characteristic of the power supply device of the 1st Embodiment of this invention, and the droop characteristic of the conventional power supply device. It is a functional block diagram used for description of the digital control circuit in the power supply device of the 2nd Embodiment of this invention. It is a block diagram of the conventional power supply device. It is a functional block diagram used for description of the digital control circuit in the conventional power supply device. It is a flowchart used for description of the droop control in the conventional power supply device.

Explanation of symbols

1a, 1b; switching power supplies 11, 12: switching element 13: inductor 14, 15: capacitor 16: digital control circuit 17: driver 30: load 51: output voltage sampling unit 52: reference voltage generating unit 53: subtractor 54: operation Amount correction amount calculation unit 55: Adder 56: Droop operation amount calculation unit 61: Output voltage sampling unit 62: Reference voltage generation unit 63: Subtractor 64: Operation amount correction amount calculation unit 65: Adder 66: Droop operation amount calculation Part

Claims (6)

In a power supply device in which a plurality of switching power supplies are connected in parallel, and power from the plurality of switching power supplies connected in parallel is supplied to a load,
Means for calculating a deviation between the reference voltage and the output voltage;
Means for calculating a correction amount of an operation amount of the switching element according to the deviation;
Means for realizing a droop characteristic by calculation from a correction amount of the operation amount;
A power supply device comprising: Means for realizing the droop characteristic is:
Means for calculating a droop operation amount calculation function with respect to the previous operation amount;
Means for adding the correction amount of the operation amount and the previous operation amount obtained by calculating the droop operation amount calculation function;
The power supply device according to claim 1, comprising: Means for realizing the droop characteristic is:
Means for calculating a droop operation amount calculation function for the current operation amount;
Means for adding the correction amount of the operation amount and the current operation amount obtained by calculating the droop operation amount calculation function;
The power supply device according to claim 1, comprising: In a control method of a power supply apparatus, wherein a plurality of switching power supplies are connected in parallel, and power from the plurality of switching power supplies connected in parallel is supplied to a load.
A first step of calculating a deviation between the reference voltage and the output voltage;
A second step of calculating a correction amount of an operation amount of the switching element according to the deviation;
A third step of realizing a droop characteristic by calculation from the manipulated variable correction amount;
A control method for a power supply apparatus comprising: The third step includes
A fourth step of calculating a droop operation amount calculation function for the previous operation amount;
A fifth step of adding the correction amount of the operation amount and the previous operation amount obtained by calculating the droop operation amount calculation function;
A sixth step of updating the operation amount by adding the correction amount of the operation amount and the previous operation amount obtained by calculating the droop operation amount calculation function;
The method for controlling a power supply device according to claim 4, further comprising: The third step includes
A seventh step of calculating a droop manipulated variable calculation function for the current manipulated variable;
An eighth step of adding the correction amount of the operation amount and the current operation amount obtained by calculating the droop operation amount calculation function;
A ninth step of updating the operation amount by adding the correction amount of the operation amount and the current operation amount obtained by calculating the droop operation amount calculation function;
The method for controlling a power supply device according to claim 4, further comprising:

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