JP3796166B2 - Output adjustment method for multiple power supplies - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for adjusting the output of a plurality of power supplies that balances the power outputs of a device that operates by connecting a plurality of power supplies to one load.
[0002]
[Prior art]
For example, when a plurality of constant voltage power supplies having different rated outputs are connected in parallel and connected to a single load, it is necessary to balance the output current of each power supply. This is because when a plurality of constant voltage power supplies are operated in parallel without balancing, the output current of the power supply with the higher voltage is maximized due to slight variations in the output voltage, and the output of the power supply with the relatively lower output voltage is output. The current is almost zero. This is because there is a problem that the power supply life of the one with the maximum output current becomes short and the power supply life becomes non-uniform.
[0003]
Therefore, there is a conventional method for adjusting the output of a plurality of power supplies, which detects output currents of a plurality of constant voltage power supplies, manually adjusts the output voltage, and balances the output currents. Further, as a method of automatically performing this adjustment, as shown in FIG. 12, current detectors 3 and 4 are incorporated in a plurality of constant voltage power supplies 1 and 2, respectively, and the output current of the constant voltage power supplies 1 and 2 is adjusted. A method of balancing was also employed.
[0004]
A power supply equipped with this automatic adjustment method includes current proportional voltage output units 7 and 8 for receiving a signal proportional to the output current from the DC supply devices 5 and 6 in the constant voltage power supplies 1 and 2 and outputting a current proportional voltage. The current voltage transmission units 7 and 8 are connected to the output voltage detection units 9 and 10 which detect the current flowing through the current proportional voltage output units 7 and 8 and input the currents to the DC supply devices 5 and 6, respectively. Wire 11. The output terminals of the constant voltage power supplies 1 and 2 are connected in parallel to the load 12.
[0005]
In this multiple power supply output adjustment method, for example, when the output voltage of one constant voltage power supply 1 is slightly high, the output current of the constant voltage power supply 1 increases and the output current of the constant voltage power supply 2 decreases. Then, the output of the current proportional voltage output unit 7 is also relatively large, and the output voltage detection units 9 and 10 have a relatively large output current of the constant voltage power source 1 through the current information transmission wire 11. Is detected. Then, the output voltage of the DC supply device 5 is suppressed and the output voltage of the DC supply device 6 is increased by the output voltage control signals from the output voltage detection units 9 and 10. Thereby, the output current of the DC supply device 5 is suppressed, the output current of the DC supply device 6 is increased, and the output currents of the constant voltage power supplies 1 and 2 are balanced.
[0006]
[Problems to be solved by the invention]
In the case of manual adjustment according to the above-described conventional technique, in order to balance the current, it is necessary to perform output adjustment work for a plurality of power supplies at the beginning of power supply operation and every predetermined period, which is troublesome. Further, if manual adjustment is not performed, there is a problem that current balance is lost, a load is applied to some power supplies, and the life of the power supply with a large load is shortened.
[0007]
In the case of the above-described conventional technique for automatically adjusting the output current, it is necessary to wire the current information transmission wire 11 in order to detect the other output current, and the configuration of the entire power supply device becomes complicated. The work was also troublesome.
[0008]
Also, in the case of a constant current power supply, when a plurality of constant current power supplies are connected in series with a load, the load is increased unless the output voltage balance of each constant current power supply is adjusted as described above. One of the power supplies generated more heat and the life of the power supply was shortened.
[0009]
The present invention has been made in view of the above-described conventional technology, and with a simple configuration, appropriately balances the outputs of a plurality of power supply devices, eliminates bias in the life of each power supply device, and stabilizes the output. It is an object of the present invention to provide an output adjustment method for a plurality of power supplies that can improve the performance.
[0010]
[Means for Solving the Problems]
The present invention relates to an output adjustment method for a plurality of power supplies that connects a plurality of power supplies and outputs a constant current or voltage, and includes a control unit that controls the output of each power supply. Fluctuate the power output for a certain period , recognize each fluctuation, calculate the output target value that balances the output of each power supply based on the fluctuation of its own power output for each power supply, Is an output adjustment method for a plurality of power supplies that is autonomously controlled for each power supply so that the current value is equal to the target value and does not require wiring such as a current information transmission wire.
[0011]
Further, when the output target value is calculated for each power source, the maximum value and the minimum value of fluctuations in its own power output are detected, and the output target value is calculated for each power source. Furthermore, when detecting the maximum and minimum values of fluctuations in its own power supply output, random fluctuations are given in advance, and the output target value is calculated for each power supply based on the maximum and minimum values of fluctuations at that time. You may do it.
[0012]
The present invention is also an output adjustment method for a plurality of power supplies that calculates the output target value of each power supply in correlation with the rated output of its own power supply when calculating the output target value for each power supply. . Furthermore, when calculating the output target value for each power source, the output target value of each power source is calculated by calculating a weighted average of the fluctuations of the output based on the rated output of the power source of its own. .
[0013]
Further, the present invention superimposes an output information signal having information on its own output on the output of each power supply device, and the other power supply device recognizes this output information signal and sets an output target value for each power supply. This is an output adjustment method for a plurality of power sources, which is calculated and autonomously controlled for each power source so that each power source output becomes this target value.
[0014]
In addition, the present invention superimposes an output information signal having information related to its own output on the output of each power supply device, a specific control unit recognizes this output information signal, and calculates an output target value of all power supplies, This is an output adjustment method for a plurality of power supplies in which each power supply is controlled by a control signal superimposed on the power supply output from the specific control unit so that each power supply output becomes the target value.
[0015]
The power source is a plurality of constant voltage power sources connected in parallel, and the output indicates an output current. Alternatively, the power source is a power source in which a plurality of constant current power sources are connected in series, and the output indicates an output voltage.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show an output adjustment method for a plurality of power supplies according to the first embodiment of the present invention. A power supply apparatus to which the output adjustment method for a plurality of power supplies is applied, for example, has a rated output of 40A and 10A. Voltage power supplies 21 and 22 are connected to one load 12 in parallel.
[0017]
As shown in FIG. 1, each constant voltage power supply 21, 22 is provided with a DC supply device 15, and the DC supply device 15 is provided with a control unit 23 that controls an output voltage. Each control unit 23 is connected to a start signal unit 25 that outputs a start signal for the control.
[0018]
In the output adjustment method for a plurality of power sources of this embodiment, the control unit 23 is operated via the start signal unit 25 at first when the power is turned on, at a predetermined periodicity, or at any time manually, and the DC supply device 15 is operated. To do. At this time, as shown in FIG. 2, the cycle of the output voltages V ₀₁ and V ₀₂ of each DC supply device 15 is randomly changed with a predetermined amplitude for a certain period. Then, the maximum values I _01a and I _02a and the minimum values I _01b and I _02b of the output voltages V ₀₁ and V ₀₂ and the output currents I ₀₁ and I ₀₂ at that time are detected.
[0019]
Maximum value and the average value of the minimum value of the output current obtained _{(I 01a + I 01b) /} 2 and _{(I 02a + I 02b) /} 2 , and each target output current _I 01c of the constant voltage source _21, and _{I 02c} . Then, as shown in FIG. 3, the output voltages V ₀₁ and V ₀₂ are adjusted so that the output currents I ₀₁ and I ₀₂ of the constant voltage power supplies 21 and 22 become the target output currents I _01c and I _02c , respectively. The adjustment is controlled so that the output currents I ₀₁ and I _{02 of the} constant voltage power supplies 21 and 22 are within 10% of the target output currents I _01c and I _02c , respectively.
[0020]
According to the output adjustment method for a plurality of power supplies of this embodiment, the current information transmission wire is not required as in the prior art, and the output voltage is adjusted by adjusting the output voltage automatically or manually when the power is turned on or at an appropriate time. Adjustment can be performed easily and reliably. This facilitates the management of the power supply device, eliminates the uneven temperature rise of the power supply device, eliminates the variation in life, and extends the life of the device as a whole. In addition, since each power supply is always in an active state, it can follow a transient change in load with good responsiveness and has high output stability.
[0021]
Next, a second embodiment of the output adjustment method for a plurality of power supplies according to the present invention will be described with reference to FIGS. Here, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, for example, a constant voltage power supply 31, 32 with a rated output of 10 A and a constant voltage power supply 33 with a rated output of 20 A are operated in parallel, and each constant voltage power supply 31, 32, 33 is connected to one load 12. Connected in parallel.
[0022]
The output adjustment method for a plurality of power sources of this embodiment is similar to the above embodiment in that the control unit is first operated via the start signal unit when the power is turned on, at a predetermined period, or at any time manually, and the direct current is applied. Operate the feeder. At this time, as shown in FIG. 6, the cycle of the output voltages V ₀₃ , V ₀₄ , V ₀₅ of each DC supply device is randomly changed with a predetermined amplitude for a certain period. At this time, as shown in FIG. 7, the center voltage V ₀ of the amplitudes of the output voltages V ₀₃ , V ₀₄ , V ₀₅ of the DC power supplies 31, 32, 33 is further determined as a target value that is current balanced. In order to search for the optimum value to be performed, each is changed randomly in stages for a certain period.
[0023]
The output voltages V ₀₃ , V ₀₄ , V ₀₅ at that time are detected during the random change of the predetermined period, and the maximum values I _03a , I ₀₅ of the output currents I ₀₃ , I ₀₄ , I ₀₅ during that period are detected. _04a , _I05a and minimum values _I03b , _I04b , _I05b are detected, respectively. Then, the center voltage V V is set to an optimum value where the difference between the maximum values I _03a , I _04a , I _05a and the minimum values I _03b , I _04b , I _05b of the output currents I ₀₃ , I ₀₄ , I _{05 is} the largest. The change of ₀ is stopped, and the center voltage at that time is fixed as V _0c .
[0024]
In this embodiment, it is preferable that an average value obtained by weighting the rated values of the constant voltage power supplies 31, 32, and 33 with respect to the maximum value and the minimum value of the obtained output current is a target output current of each power supply. However, here, for example, for the target output current of the constant voltage power supplies 31 and 32 when the change value of the output current is the rated value, the average values (I _03a + I _03b ) / 2 and (I _04a + I _04b ) are uniquely _determined. ) / 2, respectively target output current _I 03c of the constant voltage source _31, and _{I 04c,} remains in this case is _{V 03} is _{V 03} at that _time, and _{V 04} also is fixed while the _{V 04} at that time deep. For the constant voltage power supply 33 having a maximum output current equal to or lower than the rated value, the target output current I _05c is set to I _05a × 20 A / (I _05a −I _05b +20 A) by weighted averaging taking the rated value into consideration.
[0025]
Then, as shown in FIG. 6, the output voltage V ₀₅ is adjusted by a control unit (not shown) so that the output current I ₀₅ of the constant voltage power supply 33 becomes the target output current I _05c . The adjustment is controlled such that the output current I ₀₅ of the constant voltage power supply 33 falls within 10% of the target output current I _05c . By this operation, each of the maximum values I ₀₃ and I ₀₄ is further affected and moves in a direction that improves the overall balance.
[0026]
According to the output adjustment method for a plurality of power supplies of this embodiment, in addition to the effects of the above-described embodiment, the output current is balanced to a more appropriate value for each power supply when power supplies having different rated values are connected in parallel. Thus, the power supply life can be adjusted more accurately. In particular, when the center voltage V ₀ having the amplitude of the output voltages V ₀₃ , V ₀₄ , V ₀₅ is randomly changed in stages for a certain period of time, there is a large difference in individual output setting voltages from the beginning. However, it is possible to find a target value that can balance the current more accurately. Moreover, it can operate | move with the output current of a high correlation with the rated output of each constant voltage power supply 31,32,33, and a power supply lifetime can be leveled more effectively.
[0027]
Next, a third embodiment of the output adjustment method for a plurality of power supplies according to the present invention will be described with reference to FIGS. Here, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, constant voltage power supplies 41, 42 and 43 are connected to one load 12 in parallel. Each constant voltage power supply 41, 42, 43 includes a DC supply device 15 and a control unit 23, and further outputs output current information of the DC supply device 15 to the control unit 23 through a signal modulator / demodulator 48 by a superimposing coupler 46. Connected to allow input. Here, the current information of the output current of each constant voltage power source detected by each control unit 23 is superimposed on each output current of the constant voltage power sources 41, 42, 43 as a spread spectrum signal by the signal modulator / demodulator 48. Superimpose via 46.
[0028]
In the output adjustment method for a plurality of power supplies of this embodiment, the output current information transmitted from each constant voltage power supply 41, 42, 43 is used, and each constant voltage power supply 41, 42, 43 uses the superimposing coupler 46 and the signal modulator / demodulator 48. Then, the data is taken into the control unit 23. The control unit 23 calculates a target value of the current by a weighted average considering the rated output for each power source 41, 42, 43. The target value is obtained by calculating a weighting coefficient k = (I ₀₆ + I ₀₇ + I ₀₈ ) / (I _06t + I _07t + I _08t ) and multiplying the output value of each power source by the weighting coefficient k. Here, I _06t , I _07t , and I _08t are rated output current values, and I ₀₆ , I ₀₇ , and I ₀₈ are output currents of the respective power supplies.
[0029]
As a result, each of the constant voltage power supplies 41, 42 and 43 has their target values I _06c , I _07c and I _08c calculated by multiplying the output current I ₀₆ + I ₀₇ + I ₀₈ by the weighting coefficient k by their own control unit 23. The output voltage is autonomously controlled so that
[0030]
In addition, the control unit 23 of the constant voltage power supply 41 transmits a control signal via the signal modulator / demodulator 48 and the superposition coupler 46 so that the output current values of the other constant voltage power supplies 42 and 43 become the target values, thereby performing centralized control. It may be configured to
[0031]
According to the output adjustment method for a plurality of power supplies of this embodiment, the current control signal is superimposed on the output cable and transmitted to another power supply apparatus, so that no extra signal cable is required. Moreover, the influence with respect to the load 12 can be reduced by making a signal into a spread spectrum signal.
[0032]
Next, a fourth embodiment of the output adjustment method for a plurality of power supplies according to the present invention will be described with reference to FIG. In this embodiment, constant current power supplies 51 and 52 are connected in series to one load 12 as a power supply device.
[0033]
In this embodiment, the balance of the output voltage is adjusted by adjusting the output current of the constant current power supplies 51 and 52. The balance adjustment method replaces the method of detecting the output current in the method from the first embodiment to the third embodiment with a method of detecting the output voltage of the constant current power supplies 51 and 52, and the first adjustment method. Control is performed so as to balance the output voltage by the same method as in the third embodiment.
[0034]
Also by the output adjustment method of the multiple power sources of this embodiment, similarly to the effect of the above embodiment, the bias of heat generation of each power source when operating by connecting a plurality of constant current power sources in series is suppressed, and the variation in life is eliminated. A power supply device with good responsiveness to load fluctuations can be obtained.
[0035]
The output adjustment method for a plurality of power supplies of the present invention is not limited to the above embodiment, and the number and type of power supply devices connected in parallel or in series are not limited. It is also possible to use a combination of methods as appropriate.
[0036]
【The invention's effect】
The output adjustment method for a plurality of power supplies according to the present invention adjusts the balance of the outputs of each power supply device when a plurality of power supply devices are connected in parallel or in series, thereby suppressing the bias of heat generation and the like, thereby extending the life of each power supply device. Leveling can be performed and the life of the apparatus can be extended as a whole. In addition, each power supply device can be kept in an always operating state, responding well to load fluctuations and contributing to stabilization of output.
[0037]
In addition, by calculating the target output in consideration of the rated value, it is possible to adjust to a more appropriate output balance and obtain a greater effect.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of a power supply used in an output adjustment method for a plurality of power supplies according to a first embodiment of the present invention.
2 is a power supply output timing chart according to the output adjustment method for a plurality of power supplies according to the first embodiment of the present invention; FIG.
FIG. 3 is a flowchart of an output adjustment method for a plurality of power supplies according to the first embodiment of the present invention.
FIG. 4 is a diagram showing connection of power supplies used in the output adjustment method for a plurality of power supplies according to the first embodiment of the present invention.
FIG. 5 is a diagram showing connection of power sources used in the output adjustment method for a plurality of power sources according to the second embodiment of the present invention.
FIG. 6 is a timing chart of power supply output by the output adjustment method for a plurality of power supplies according to the second embodiment of the present invention.
FIG. 7 is a partial enlarged timing chart of power output by the output adjustment method for a plurality of power supplies according to the second embodiment of the present invention.
FIG. 8 is a diagram showing connection of power supplies used in the output adjustment method for a plurality of power supplies according to the third embodiment of the present invention.
FIG. 9 is a schematic block diagram of a power supply used in the output adjustment method for a plurality of power supplies according to the third embodiment of the present invention.
FIG. 10 is a timing chart of power supply output by the output adjustment method for a plurality of power supplies according to the third embodiment of the present invention.
FIG. 11 is a diagram showing the connection of power sources used in the output adjustment method for a plurality of power sources according to the fourth embodiment of the present invention.
FIG. 12 is a schematic circuit diagram of a power supply device according to a conventional output adjustment method for a plurality of power supplies.
[Explanation of symbols]
5,15 DC supply device 12 Load 21, 22 Constant voltage power supply 23 Control unit 25 Start signal unit

Claims (6)

In the output adjustment method for multiple power supplies that connect multiple power supplies and output with a constant current or voltage, each power supply has a control unit that controls its output, and this control unit varies its power supply output for a certain period is allowed each to recognize the fluctuation, the target output value-balanced output of each power supply, calculated on the basis of the fluctuation of the power supply output of the self to each power, each power output becomes the target value As described above, an output adjustment method for a plurality of power supplies, wherein each power supply is autonomously controlled.   2. The output adjustment method for a plurality of power supplies according to claim 1, wherein a maximum value and a minimum value of fluctuations in the power supply output of the power supply are detected, and an output target value is calculated for each power supply.   When detecting the maximum and minimum values of fluctuations in its own power output, give random fluctuations in advance and calculate the output target value for each power supply based on the maximum and minimum values of fluctuations at that time. 3. The output adjustment method for a plurality of power supplies according to claim 2. When calculating the output target value for each power supply , correlate with the rated output of its own power supply, calculate the weighted average of the fluctuations of the output, and calculate the output target value of each power supply The output adjustment method for a plurality of power supplies according to claim 1.   5. The output adjustment method for a plurality of power supplies according to claim 1, wherein the power supply is a plurality of constant voltage power supplies connected in parallel, and the output indicates an output current.   5. The output adjustment method for a plurality of power supplies according to claim 1, wherein the power supply is a plurality of constant current power supplies connected in series, and the output indicates an output voltage.

Images