JP2850693B2 - Pulse power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback type pulse power supply used for a pulse laser or the like.

[0002]

2. Description of the Related Art FIG. 9 is a circuit diagram showing a configuration of a conventional pulse power supply of this type disclosed in, for example, Japanese Patent Application Laid-Open No. 4-181805. In the figure, 1 is a DC power supply, 2 is a main switching element composed of a transistor, 3 is a sub-switching element composed of a transistor connected in series with the main switching element 2, 4 is an iron core 4a and the iron core 4
The transformer 5 includes a primary winding 4b and a secondary winding 4c wound around a. A reference numeral 5 denotes a return diode that forms a return circuit with the primary winding 4b and the sub-switching element 3 of the transformer 4, and 6 denotes a main switching element 2. The main base signal S ₁ and the sub base signal S ₂
To control the on / off state and the current command value S ₆
Is a control circuit to which is input.

Reference numeral 7 denotes an oscillator for transmitting a trigger signal S ₃ to the control circuit 6, and reference numeral 8 denotes a current for detecting a primary current I ₁ flowing through the primary winding 4 b of the transformer 4 and transmitting a current signal S ₄ to the control circuit 6. detector, 9 is a rectifier diode connected to the secondary winding 4c of the transformer 4, 10 voltage detector delivering a voltage signal S ₅ detects the output voltage V _2, 11 is a voltage detector 1
Comparator A, 12 is a load capacitor 0 voltage signal S ₅ from the comparison between voltage command value S ₇ inputted separately delivering a comparison signal S ₈ to the control circuit 6, 13, for example a load of the laser oscillator or the like, 14 is a high voltage switch for supplying to a load 13 a charge stored in the load capacitor 12 as a load current I _2.

FIG. 10 shows a trigger signal S ₃ , a main base signal S ₁ , and a transformer 4 in a conventional device configured as described above.
5 is a timing chart showing a primary current I ₁ , a sub base signal S ₂ , an output voltage V ₂ and a load current I ₂ .

Next, the operation of the conventional apparatus will be described with reference to FIG. If the trigger signal S ₃ from the oscillator 7 at time t ₁ as shown in FIG. 10 is sent, the control circuit 6 the main base signals S ₁ and the sub-base signal S ₂ transmits the main switching element 2 and the sub-switching element 3 Turn on. As a result, the primary current I ₁ flows from the DC power supply 1 to the primary winding 4b of the transformer 4 through the main switching element 2 and the sub-switching element 3, and increases with time.
At this time, the return diode 5 is reverse-biased and off, and the rectifier diode 9 is reverse-biased and off. Then, the primary current I ₁ is detected by the current detector 8 and sent to the control circuit 6 as a current signal S ₄ .

Next, at time t ₂ , when the primary current I ₁ becomes the set current I _1S commanded by the current command value S ₆ , the control circuit 6 turns off both the main switching element 2 and the sub switching element 3. . Thereby a voltage is generated in the secondary winding 4c by the excitation energy stored in the transformer 4 is charged the load capacitor 12 through the rectifying diode 9, the output voltage V ₂ is the charging voltage is gradually increased. The output voltage V ₂ is detected by the voltage detector 10 is sent to the comparator A11 as a voltage signal S _5.

[0007] At time t _3, the output voltage V ₂ becomes the set voltage V _2S instructed by the voltage command value S _7, comparator A1
1 sends the comparison signal S ₈ to the control circuit 6, the control circuit 6 turns on the sub-switching element 3. Here, the condition that the output voltage V ₂ rises to the set voltage V _2S is such that the capacitance of the load capacitor 12 is C ₂ and the inductance of the primary winding 4b is L ₁
Then, I _1S > √ (C ₂ / L ₁ ) · V _2S . Therefore, the set current I _1S and the set voltage V _2S are set so that the above equation holds. When the sub-switching element 3 is turned on, the excitation energy remaining in the transformer 4 at this time flows into the return circuit composed of the primary winding 4b, the sub-switching element 3 and the return diode 5 as a return current _{IF, and} is output. increase in the voltage V ₂ becomes constant at the set voltage V _2S stopped.

Next, when the high-voltage switch 14 is turned on at time t ₄ , the electric charge stored in the load capacitor 12 is discharged through the load 13 and a desired steep pulse-like load current I ₂ flows. Then, the load current I ₂ at time t ₅ becomes 0, and turns off the high-pressure switch 14 simultaneously. Thereafter, the trigger signal S ₃ from the oscillator 7 via a predetermined time is sent to the control circuit 6, the operation of the next cycle is started. Although the primary current I ₁ already during the second and subsequent main switching element 2 on the transformer 4 is present, the operation is the same as for the first time.

Here, the return current _IF and the set voltage V _2S have a relationship such that the following equation (1) holds. ^{_{1/2 · L 1 · I F 2}} = 1/2 · L 1 · I 1S 2 -1/2 · C 2 · V 2S 2 ··· (1) Therefore, if the set current I _1S is constant, FIG. As shown in FIG. 10, when the set voltage V _2S is reduced to V _2S ′, the return current _IF is increased to _IF ′. From the above equation (1), the return current _IF is expressed by the following equation (2). ^{_{I F = √ (I 1S 2}} -C 2 / L 1 · V 2S 2) ········
(2) Thus, the return current I _F and the capacitance C ₂ of the load capacitor 12, varies the inductance L ₁ of the primary winding 4b. That is, when the inductance L ₁ is constant, the return current I _F decreases the capacity C ₂ is increased, the capacitance C ₂
Becomes smaller and becomes larger.

[0010]

THE INVENTION Problems to be Solved by conventional pulse power supply is constituted as described above, since the value of the primary current I ₁ was fixed to the value of a preset current I _1S, the output voltage V ₂ When the setting range is widened, the setting current I _1S value of the primary current I ₁ needs to be very large. Accordingly, when the lower settings V _2S of the output voltage V _2, the primary winding 4b of the transformer 4, the return current I _F flowing through the sub-switching element 3 and a reflux diode 5 becomes very large value, extra power loss There was a problem that it occurred.

When a capacitor having a negative temperature coefficient is used as the load capacitor 12, as the operation time elapses, the temperature of the load capacitor 12 increases due to self-heating or the surrounding atmosphere, and the capacitance C ₂ decreases. As a result, the return current _IF becomes a large value, and there is a problem that extra power loss occurs as described above.

The present invention has been made in order to solve the above-mentioned problems. Even if the output voltage setting range is widened, or if a load capacitor having a negative temperature coefficient is used, It is an object of the present invention to provide a pulse power supply device capable of suppressing excess power loss due to a return current.

[0013]

According to a first aspect of the present invention, there is provided a pulse power supply device in which a main switching element, a sub-switching element, and a primary winding connected in series are connected to a DC power supply via the two switching elements. that transformer, comprising a rectifier diode connected to the secondary winding of the freewheeling diode and the transformer via the sub-switching element is connected to the primary winding of the transformer, the main switch
Switching element and sub-switching element
After that, when the current of the primary winding reaches a predetermined current command value
The main switching element and sub-switching element
At the same time, the excitation energy of the transformer stored by the current from the DC power supply is output as a pulse voltage via the rectifier diode, and the sub-switching element is turned on when the pulse voltage reaches a predetermined voltage command value. in flyback pulse power supply are turned on to form a reflux circuit in the primary winding of the freewheeling diode and the transformer, the voltage command
The above current command value is obtained by multiplying the
By providing a current setting circuit for output,
The current flowing through the road is constant regardless of the voltage command value .

According to a second aspect of the present invention, there is provided a pulse power supply device comprising: a main switching element and a sub-switching element connected in series; a transformer having a primary winding connected to a DC power supply via both switching elements; A return diode connected to the primary winding of the transformer and a rectifier diode connected to the secondary winding of the transformer, and a value of a low-frequency component of a current flowing through the primary winding of the transformer and a preset return current The current from the DC power supply is controlled so that the current command value becomes equal to the current command value.

According to a third aspect of the present invention, there is provided a pulse power supply device comprising: a difference value between a low-frequency component value of a current flowing through a primary winding of a transformer according to the second aspect and a preset return current command value; The hold is performed at the timing of the trigger signal.

According to a fourth aspect of the present invention, there is provided a pulse power supply device comprising: a main switching element and a sub-switching element; a transformer having a primary winding connected to a DC power supply via the main switching element; A return diode connected to the primary winding and a rectifier diode connected to the primary winding of the transformer, wherein the value of the low-frequency component of the current flowing through the primary winding of the transformer and a preset return current command value are The current from the DC power supply is controlled to be equal.

According to a fifth aspect of the present invention, there is provided a pulse power supply device comprising: a difference value between a low frequency component value of a current flowing through a primary winding of a transformer according to the fourth aspect and a preset return current command value; The hold is performed at the timing of the trigger signal.

[0018]

According to a first aspect of the present invention, there is provided a pulse power supply device comprising a current setting circuit and a voltage designation value as a current command value.
Is multiplied by a predetermined constant to keep the return current constant. Further, the pulse power supply device according to claims 2 to 5 of the present invention is configured such that the current from the DC power supply is converted into a low-frequency component value of the current flowing through the primary winding of the transformer and a preset return current command value. By controlling them to be equal, the return current is kept constant at a low level.

[0019]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 1 of the present invention. In the figure, the same parts as those of the conventional device shown in FIG. 15 current setting circuit for sending a current command value S ₆ for setting a set current I _1S of the primary current I ₁ multiplied by an arbitrary constant K to the voltage command value S _7, 16 is sent from the current detector 8 The current signal S ₄ is compared with a current command value S ₆ sent from the current setting circuit 15 and the comparison signal S ₉
Is a comparator B that sends out the following.

FIG. 2 shows the trigger signal S ₃ , the main base signal S ₁ , the primary current I ₁ of the transformer 4, the sub base signal S ₂ , and the output voltage V ₂ in the pulse power supply of the first embodiment configured as described above. and is a timing chart showing the load current I _2.

Next, the operation will be described with reference to FIG. If the trigger signal S ₃ from the oscillator 7 at time t ₁ is transmitted as shown in FIG. 2, the control circuit 6 sends a main base signals S ₁ and the sub-base signal S _2, the main switching element 2 and the sub-switching The element 3 is turned on. This allows
Mainly through the switching element 2 and the sub-switching element 3 from the DC power source 1, slide into increased with the primary current I ₁ flows time the primary winding 4b of the transformer 4. The primary current I ₁ is detected by current detector 8, is sent to the comparator B16 as a current signal S _4.

In the comparator B16, the current setting circuit 1
A current command value S ₆ sent by multiplying the arbitrary constant K to the voltage command value S ₇ at 5, when they are equal at time t ₂ is compared with the current signal S _4, the comparison signal S ₉ is sent Is done. As in the conventional device control circuit 6 by the comparison signal S _9, thereby the voltage in the secondary winding 4c by the excitation energy stored in the transformer 4 to turn off both the main switching element 2 and the sub-switching element 3 There occurs, the load capacitor 12 via the rectifier diode 9 is charged, the output voltage V ₂ is the charging voltage is gradually increased. And this output voltage V ₂ is the voltage detector 1
Detected by 0, is sent to the comparator A11 as a voltage signal S _5.

[0023] At time t _3, the output voltage V ₂ becomes the set voltage V _2S instructed by the voltage command value S _7, comparator A1
1 sends the comparison signal S ₈ to the control circuit 6, the control circuit 6 turns on the sub-switching element 3. When the sub-switching element 3 is turned on, the excitation energy remaining in the transformer 4 at this time flows into the return circuit composed of the primary winding 4b, the sub-switching element 3 and the return diode 5 as a return current _{IF, and} is output. increase in the voltage V ₂ becomes constant at the set voltage V _2S stopped.

Next, when the high voltage switch 14 is turned on at time t ₄ , the electric charge stored in the load capacitor 12 is discharged through the load 13, and a desired steep pulsed load current I ₂ flows. Then, the load current I ₂ at time t ₅ becomes 0, and turns off the high-pressure switch 14 simultaneously. Thereafter, the trigger signal S ₃ from the oscillator 7 via a predetermined time is sent to the control circuit 6, the operation of the next cycle is started.

The constant K by which the voltage command value S ₇ is multiplied by the current setting circuit 15 is set as follows. First, the relationship between the set current I _1S the set voltage V _2S of the output voltage V ₂ of the primary current I ₁ from the above equation ^{_{(1), I 1S 2 =}} (C 2 / L 1) · V 2S 2 + I F ²・ ・ ・ ・ ・ ・ ・ ・ ・
... (3) Since who return current I _F is small loss is reduced, the relation between the circulating current I _F and the set current I _1S I
When _1S >> I _F, it can be approximated to the following equation negligible I _F in the above equation (3) (4). I _1S ≒ √ (C ₂ / L ₁ ) · V _2S ···
... (4)

The current command value S for the set current I _1S
6 ratio of S ₆ / I _1S = X, the ratio of the voltage command value S ₇ for setting the voltage V _2S and S ₇ / V _2S = Y, when changing position the relationship of formula (4) to the signal level S ₆ / _{X ≒ √ (C 2 / L} 1) · S 7 / Y ∴S 6 ≒ √ (C 2 / L 1) · (X / Y) · S 7 ······
(5) Therefore, the constant K is set so that K ≧ √ (C ₂ / L ₁ ) · X / Y from the above equation (5). This constant K has a variable range, it is possible to adjust the magnitude of the circulating current I _F by adjusting the constant K. Also, even if the set voltage V _2S commanded by the voltage command value S ₇ changes, the current setting circuit 1
In 5 in accordance with the setting voltage V _2S as described above by setting an arbitrary constant K, since the set current L _1S corresponding to the set voltage V _2S by multiplying this is set, the return current I _F is It does not change.

Embodiment 2 FIG. FIG. 3 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 2 of the present invention. FIG. 4 is a diagram showing a trigger signal S ₃ , a main base signal S ₁ , a return current command value S ₁₁ , and an integration in the pulse power supply device shown in FIG. Value S ₁₀ , primary current I ₁ of transformer 4, sub-base signal S ₂ and output voltage V ₂
6 is a timing chart showing the timing chart of FIG. In the figure, the same parts as those in the first embodiment shown in FIG.

[0028] 17 integrated signal after integrating removed low frequency components of the current signal S ₄ sent from the current detector 8 S
Integrator delivering _10, 18 integral signal S is sent from the integrator 17 from the return current command value signal S ₁₁ which is set in advance
₁₀ by subtracting sends a signal S ₁₂ the adder A, 19 is a predetermined constant K ¹ to the signal S ₁₂ sent from the adder A18
Multiplied by an amplifier for sending a control signal S ₁₃ that determines the return current control range, 20 to the current command value S ₆ sent from the current setting circuit 15 adds a control signal S ₁₃ sent from the amplifier 19, an adder B for sending a current command value S ₁₄ for setting a set current I _1S.

Next, the operation will be described with reference to FIG. If the trigger signal S ₃ from the oscillator 7 at time t ₁ is transmitted as shown in FIG. 4, the control circuit 6 sends a main base signals S ₁ and the sub-base signal S _2, the main switching element 2 and the sub-switching The element 3 is turned on. This allows
Mainly through the switching element 2 and the sub-switching element 3 from the DC power source 1, slide into increased with the primary current I ₁ flows time the primary winding 4b of the transformer 4. This primary current I ₁ is detected by the current detector 8 and sent to the comparator B 16 and the integrator 17 as a current signal S ₄ .

Then, the integrator 17 extracts the low frequency component of the current signal S ₄ and sends out the integrated value S ₁₀ to the adder A 18. The adder A18 has a preset return current command value S
The difference signal S ₁₂ between the signal ₁₁ and the integrated value S ₁₀ from the integrator 17 is sent to the amplifier 19. The difference value signal S ₁₂ is amplifier 19
Amplified by the control signal is input to the adder B20 as S _13, the adder B20 and the control signal S _13, the sum of the current command value S ₆ which is determined by the voltage command value S _7, actually set current I _1S and it sends to the comparator B16 as a current command value S ₁₄ for setting.

[0031] is compared with the comparator in B16 current command value S ₁₄ and the current signal S ₄ is, when they are equal at time t _2, the are sent to the control circuit 6 as a comparison signal S _9. When the comparison signal S ₉ is input, the control circuit 6 turns off the main switching element 2 and the sub-switching element 3. Then, a voltage is generated in the secondary winding 4c by the exciting energy stored in the transformer 4 is charged the load capacitor 12 through the rectifying diode 9, the charge voltage, i.e. the output voltage V ₂ gradually rises.
Then, the output voltage V ₂ is detected by the voltage detector 10 is sent to the comparator A11 as a voltage signal S _5.

The increased output voltage V ₂ is gradually, when the voltage signal S ₅ becomes equal to the voltage command value S ₇ at time t _3, the comparator A11 sends out the comparison signal S ₈ to the control circuit 6, the control circuit 6 The sub-switching element 3 is turned on. When the sub-switching element 3 is turned on, the excitation energy remaining in the transformer 4 at this time, the primary winding 4b, as the return current I _F to the configured back circuit in the sub-switching element 3 and the reflux diodes 5 flow, increase of the output voltage V ₂ becomes constant at the set voltage V _2S stopped.

Next, when the high-voltage switch 14 is turned on at time t ₄ , the electric charge stored in the load capacitor 12 is discharged through the load 13, and a desired steep pulse-like load current I ₂ is obtained although not shown. The flow is the same as in Example 1,
After a certain time, it becomes 0, and at the same time, the high-voltage switch 14
Is turned off. Thereafter, the trigger signal S ₃ from the oscillator 7 via a predetermined time is sent to the control circuit 6 operates in the next cycle is started.

As described above, while the operation with one cycle from time t ₁ to t ₄ is sequentially repeated, the return current _IF is supplied for most of the time in one cycle, and the current detector 8
And an integrator 17 to detect the low-frequency component of the current I ₁ flowing through the primary winding 4b of the transformer 4, can simulate the value of approximately circulating current I _F, the current command value S ₁₄ that determines the set current I _1S is is controlled according to the difference value signal S ₁₂ of the integrated value S ₁₀ sent from the integrator 17 and the circulating current command value S _11.

[0035] Also, from the relationship of the above equation (2), the return current I _F is apparent that increased or decreased in proportion to the set current I _1S. Thus, as the integrated value S ₁₀ and the return current command value S ₁₁ are equal, by controlling the set current I _1S sets the current command value S _14, the 't ₄ from' for example, time t ₁ 1 As shown in the timing chart of the period, the return current _IF 'decreases. That is, the return current I _F
Since it is controlled to a value determined by the return current command value S _11, the return current in order to reduce the I _F may be a value of the return current command value S ₁₁ to a low value, the return current command value S Once you have a predetermined value when preset _11, return current I _F is can be kept constant at a low level.

Embodiment 3 FIG. FIG. 5 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 3 of the present invention, and FIG. 6 is a trigger signal S ₃ , main base signal S ₁ , return current command value S ₁₁ , integration in the pulse power supply device shown in FIG. Value S ₁₀ , primary current I ₁ of transformer 4, sub-base signal S ₂ and output voltage V ₂
6 is a timing chart showing the timing chart of FIG. In the figure, the same parts as those of the second embodiment shown in FIG. The difference value signal S ₁₂ of 21 to the reflux current command value S ₁₁ sent from the adder A18 and the integrated value S _10,
Together hold the trigger signal S _3, a sample hold circuit for sending to the amplifier 19 as the control signal S _13.

According to the third embodiment configured as described above, the integrated value S ₁₀ from the integrator 17 and the return current command value S ₁₁
Once hold the difference value S ₁₂ by the sample-and-hold circuit 21 and, since the so sent to the amplifier 19, the current command value S _14, as shown in FIG. 6, the trigger signal S ₃ sent from the oscillator 7 is held at the timing, the setting by the held current command value S ₁₄ current controls the I _1S, return current I _F reflux preset current command value S ₁₁
Since the control, the return current to the I _F can be held constant at a low level, of course, always in comparison with the case of controlling a current command value S ₁₄ is changing, it is possible to stably control.

Embodiment 4 FIG. In the second embodiment, as shown in FIG. 3, the main switching element 2 and the sub switching element 3 are connected in series, and this is connected to the primary winding 4b of the transformer 4.
7, the pulse is configured such that the sub-switching element 3 and the return diode 5 are independent of the main switching element 2 and connected to the primary winding 4b of the transformer 4, as shown in FIG. Even when the present invention is applied to a power supply device, the same effect as in the second embodiment can be obtained.

Embodiment 5 FIG. Further, the sample and hold circuit 21 of the pulse power supply device according to the third embodiment shown in FIG. 5 is added to the pulse power supply device according to the fourth embodiment shown in FIG.
Even when applied to a pulse power supply device having a configuration as shown in FIG.
Needless to say, the same effects as in the third embodiment are obtained.

[0040]

As described above, according to the first aspect of the present invention , a voltage setting is provided as a current command value by providing a current setting circuit.
Since the value is set to a value multiplied by a predetermined constant ,
The return current can be suppressed irrespective of the output voltage, and according to the second and fourth aspects of the present invention, the current from the DC power supply is reduced to the value of the low frequency component of the current flowing through the primary winding of the transformer. And the preset return current command value are controlled to be equal, so that the return current can be kept constant at a low level. Further, according to the third and fifth aspects of the present invention, Since the difference between the value of the low-frequency component and the return current command value in claims 2 and 4 is held at the timing of the trigger signal, more stable control is possible, and the setting range of the output voltage is reduced. It is possible to provide a pulse power supply device that can suppress an excessive power loss due to a return current even if the load capacitor has a negative temperature coefficient even if it is wide.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 1 of the present invention.

FIG. 2 is a timing chart showing a trigger signal S ₃ , a main base signal S ₁ , a primary current I ₁ , a sub base signal S ₂ , an output voltage V ₂ and a load current I ₂ in the pulse power supply device shown in FIG. It is a chart.

FIG. 3 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 2 of the present invention.

4 shows a trigger signal S ₃ , a main base signal S ₁ , a current command value S ₁₄ , an integral value S ₁₀ , a trigger signal S ₃ in the pulse power supply device shown in FIG.
5 is a timing chart showing a primary current I ₁ , a sub base signal S ₂ and an output voltage V ₂ of a transformer 4.

FIG. 5 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 3 of the present invention.

6 shows a trigger signal S ₃ , a main base signal S ₁ , a current command value S ₁₄ , an integral value S ₁₀ , a trigger signal S ₃ in the pulse power supply device shown in FIG.
5 is a timing chart showing a primary current I ₁ , a sub base signal S ₂ and an output voltage V ₂ of a transformer 4.

FIG. 7 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 4 of the present invention.

FIG. 8 is a circuit diagram showing a configuration of a pulse power supply device according to Embodiment 5 of the present invention.

FIG. 9 is a circuit diagram showing a configuration of a conventional pulse power supply device.

10 shows a trigger signal S ₃ , a main base signal S ₁ , a primary current I ₁ of the transformer 4 in the pulse power supply device shown in FIG. 9,
5 is a timing chart showing a sub base signal S ₂ , an output voltage V ₂ and a load current I ₂ .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 DC power supply 2 Main switching element 3 Sub-switching element 4 Transformer 4b, 4c Primary and secondary winding 5 Reflux diode 6 Control circuit 7 Oscillator 8 Current detector 9 Rectifier diode 10 Voltage detector 11 Comparator A 12 Load capacitor 13 Load 14 High voltage switch 15 Current setting circuit 16 Comparator B 17 Integrator 18 Adder 19 Amplifier 20 Adder B 21 Sample hold circuit S ₃ Trigger signal S ₄ Current signal S ₅ Voltage signal S ₆ Current command value S ₁₀ Integral value S ₁₁ Return current command value S ₁₄ Current command value I ₁ Primary current of transformer I ₂ Load current V ₂ Output voltage

Claims (5)

(57) [Claims] 1. A main switching element and a sub-switching element connected in series, and a primary winding connected to a DC power supply via the two switching elements, and to a primary winding of the transformer via the sub-switching element. a reflux diode and the rectifier diode connected to the transformer secondary winding is connected, the main switching
After turning on the element and sub-switching element simultaneously
When the current of the primary winding reaches the specified current command value,
Main switching element and sub switching element simultaneously
By turning off, the excitation energy of the transformer stored by the current from the DC power supply is output as a pulse voltage via the rectifier diode, and the sub-switching element is turned on when the pulse voltage reaches a predetermined voltage command value. In a flyback type pulse power supply device which is turned on to form a freewheeling circuit with the freewheeling diode and the primary winding of the transformer, the voltage command value is multiplied by a predetermined constant to obtain the power supply.
By providing a current setting circuit that outputs a flow command value,
The current flowing through the return circuit is not affected by the voltage command value.
A pulse power supply device characterized in that it is configured to be constant . 2. A main switching element and a sub-switching element connected in series, and a primary winding connected to a DC power supply via both the switching elements, and a primary winding of the transformer via the sub-switching element. A return diode connected to the transformer and a rectifier diode connected to the secondary winding of the transformer, and the excitation energy of the transformer stored by the current from the DC power supply is output as a pulse voltage via the rectifier diode. In the flyback type pulse power supply device in which the sub-switching element is turned on when the pulse voltage reaches a predetermined value to form a return circuit with the return diode and the primary winding of the transformer, the primary winding of the transformer The low-frequency component of the current flowing through the line is detected, and the value of this low-frequency component is A pulse current device comprising comparing a return current command value set to a desired value and controlling a current from the DC power supply so that the two values become equal. 3. The pulse power supply device according to claim 2, wherein a difference value between the value of the low frequency component and the return current command value is held at a timing of a trigger signal. 4. A transformer having a main switching element, a sub-switching element, and a primary winding connected to a DC power supply via the main switching element, and a return current connected to a primary winding of the transformer via the sub-switching element. A diode and a rectifier diode connected to the secondary winding of the transformer, outputting the excitation energy of the transformer stored by the current from the DC power supply as a pulse voltage via the rectifier diode, and In a flyback type pulse power supply device in which the sub-switching element is turned on when a predetermined value is reached to form a freewheeling circuit with the freewheeling diode and the primary winding of the transformer, a current flowing in the primary winding of the transformer Low-frequency component, and set the value of this low-frequency component to a desired value in advance. A pulse power supply device, wherein a current from the DC power supply is controlled such that the two values become equal by comparing the set return current command value. 5. The pulse power supply according to claim 4, wherein the difference between the value of the low frequency component and the return current command value is held at the timing of the trigger signal.