KR102040888B1 - High voltage power supply having single switch and control circuit device for the same - Google Patents

Abstract

A control circuit device according to an aspect of the present invention is a control circuit device for zero voltage switching of a high voltage power supply device having a single switch, the pulse voltage corresponding to a comparison result of the magnitude of a predetermined type of voltage. A first comparator for outputting a signal, a timer for applying an ON signal to a gate of a single switch according to the magnitude of a pulse voltage output from the first comparator, and an error corresponding to a difference between magnitudes of a predetermined type of voltage Including a second comparator for outputting a voltage, the timer unit may block the ON signal applied to the gate according to the comparison result of the magnitude of the error voltage and the magnitude of the accumulated voltage of the ON signal.

Description

HIGH VOLTAGE POWER SUPPLY HAVING SINGLE SWITCH AND CONTROL CIRCUIT DEVICE FOR THE SAME

The technical idea of the present invention relates to a high voltage power supply, and more particularly, to an apparatus and method for controlling a resonant high voltage power supply having a single switch.

High voltage power supplies (HVPS) can be used in devices that require voltages of thousands to tens of thousands of volts. Equipment to which a high voltage power supply is applied is very diverse, for example, X-ray generator, electric dust collector, air purifier, printer and the like.

As a power conversion method of a high voltage power supply device, there are a push-pull method, a half-bridge method, a full bridge method, a flyback method, and the like. Among them, push-pull, half-bridge, and full-bridge methods are applied to X-ray generators, electrostatic precipitators, and air cleaners that require power of several tens of watts or more. In addition, the flyback method is applied to printers, ion generators, and the like, which require power of 10W or less.

The reason why the flyback method is not applied to a device that requires more than tens of watts of power is that two or more semiconductor switches must be applied when the flyback method is applied, which complicates the circuit in driving the switch and in the number of elements. The disadvantage is that the production cost is increased. Accordingly, push-pull, half-bridge, and full-bridge methods, which basically employ two or more semiconductor switches, are widely used.

On the other hand, in the case of a resonant high voltage power supply having a single switch, it may be possible to switch to a high frequency (about 100KHz or more) as the size of the transformer is reduced. However, in the case of high frequency switching, switching power loss may occur, which limits implementation. As a result, there are few experienced developers for a resonant high voltage power supply having a single switch. There is a problem that it is difficult to guarantee.

Therefore, a method for reliably driving a resonant high voltage power supply having a single switch through a simple control circuit is required.

The technical problem to be achieved by a high voltage power supply having a single switch and a control circuit device therefor according to the technical idea of the present invention is to achieve zero voltage switching of the high voltage power supply with a simple circuit configuration.

In addition, a technical problem to be achieved by a high voltage power supply having a single switch and a control circuit device therefor according to the technical idea of the present invention is to improve the utilization of the single switch high voltage power supply.

The technical problem to be achieved by the high-voltage power supply having a single switch and a control circuit device for the same according to the technical idea of the present invention is not limited to the above-mentioned problems, another task that is not mentioned from those skilled in the art Will be clearly understood.

A control circuit device according to an aspect of the present invention is a control circuit device for zero voltage switching of a high voltage power supply device having a single switch, the pulse voltage corresponding to a comparison result of the magnitude of a predetermined type of voltage. A first comparator for outputting a; A timer unit applying an ON signal to a gate of the single switch according to the magnitude of the pulse voltage output from the first comparator; And a second comparator configured to output an error voltage corresponding to a difference in magnitude of a preset type of voltage, wherein the timer unit is further configured to compare the magnitude of the error voltage with a magnitude of the accumulated voltage of the ON signal. Accordingly, the on signal applied to the gate is blocked.

According to an exemplary embodiment, the first comparator may compare an input voltage of the high voltage power supply with a magnitude of a switch voltage applied to both ends of the single switch, and output a pulse voltage indicating a comparison result.

According to an exemplary embodiment, the first comparator may output a pulse voltage of a first state when the input voltage of the high voltage power supply is greater than the size of the switch voltage, the timer unit, The on signal may be applied to the gate of the single switch according to the pulse voltage.

According to an exemplary embodiment, when the magnitude of the switch voltage is greater than the magnitude of the input voltage of the high voltage power supply as the single switch is blocked due to the blocking of the on signal, the first comparator may be configured to be in a second state. The pulse voltage can be output.

According to an exemplary embodiment, the timer unit comprises: a first comparison element for outputting a setting signal of a predetermined state according to the state of the pulse voltage; An on / off control element for applying an on signal to a gate of the single switch according to a setting signal of a first state; And a second comparison element receiving the accumulated voltage and the error voltage and outputting a reset signal to the on / off control element according to a result of comparing the magnitude of the accumulated voltage and the error voltage.

According to an exemplary embodiment, the on / off control element may block the application of the on signal in accordance with the reset signal.

According to an exemplary embodiment, the on / off control element may include an SR latch element.

According to an exemplary embodiment, the control circuit device may further include an integrator that accumulates and transmits the voltage of the on signal to the timer unit.

According to an exemplary embodiment, the control circuit device may further include a delayer for delaying the pulse voltage output from the first comparator.

According to an exemplary embodiment, the control circuit device may further include a CMOS inverter for transmitting the ON signal output from the timer unit to the gate of the single switch.

According to another aspect of the inventive concept, a high voltage power supply may include: an LLC converter connected to a first node of an input voltage; A single switch connected to the second node of the input voltage; A voltage amplifier connected to the secondary side of the transformer of the LLC converter; And a control circuit connected to the gate terminal of the single switch to control switching of the single switch.

According to an exemplary embodiment, the control circuit may include: a first comparator comparing the input voltage with a magnitude of a switch voltage applied across the single switch and outputting a pulse voltage indicating a comparison result; A timer unit applying an ON signal to a gate of the single switch according to the magnitude of the pulse voltage output from the first comparator; And a second comparator configured to output an error voltage corresponding to a difference between an output voltage of the high voltage power supply and a preset reference voltage, wherein the timer unit includes a magnitude of the error voltage and an ON signal. The on signal applied to the gate may be blocked according to the comparison result of the magnitude of the accumulated voltage.

In example embodiments, the first comparator may output a pulse voltage in a first state when the input voltage is greater than a magnitude of the switch voltage, and the timer unit may be configured according to the pulse voltage of the first state. The on signal can be applied to the gate of a single switch.

According to an exemplary embodiment, the first comparator may output a pulse voltage of a second state when the size of the switch voltage is greater than that of the input voltage as the single switch is blocked due to the blocking of the on signal. Can be.

According to an exemplary embodiment, the timer unit comprises: a first comparison element for outputting a setting signal of a predetermined state according to the state of the pulse voltage; An on / off control element for applying an on signal to a gate of the single switch according to a setting signal of a first state; And a second comparison element receiving the accumulated voltage and the error voltage and outputting a reset signal to the on / off control element according to a result of comparing the magnitude of the accumulated voltage and the error voltage.

According to an exemplary embodiment, the control circuit may further include an integrator that accumulates and transmits the voltage of the on signal to the timer unit.

According to an exemplary embodiment, the control circuit may further include a delayer for delaying the pulse voltage output from the first comparator.

In example embodiments, the electronic device may further include a CMOS inverter configured to transfer an ON signal output from the timer unit to a gate of the single switch.

The high voltage power supply device having a single switch and the control circuit device therefor according to the embodiments of the inventive concept can achieve zero voltage switching of the high voltage power supply with a simple circuit configuration.

In addition, a high voltage power supply having a single switch and a control circuit device therefor according to embodiments of the inventive concept may improve the utility of the single switch high voltage power supply.

In addition, the high voltage power supply apparatus having a single switch and the control circuit apparatus therefor according to the embodiments of the inventive concept may reduce the size of the transformer by high frequency switching.

In addition, the high voltage power supply apparatus having a single switch and the control circuit apparatus therefor according to the embodiments of the inventive concept may reduce the capacitance of the capacitor of the back voltage circuit.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings referred to herein, a brief description of each drawing is provided.
1 is a view for explaining the power loss caused by the switching operation of the switch.
2 is a view for explaining the concept of soft switching.
3 is a circuit diagram of a high voltage power supply to which a control circuit according to an embodiment of the inventive concept is applied.
4 is a circuit diagram of a control circuit according to an embodiment of the inventive concept.
FIG. 5 is a diagram showing voltages and currents measured at main nodes of the control circuit shown in FIG. 4.
6A to 6D are diagrams for describing an equivalent circuit for each operation mode of a high voltage power supply device according to an embodiment of the inventive concept.
FIG. 7 is a diagram illustrating experimental results of a high voltage power supply device according to an embodiment of the inventive concept.

The technical spirit of the present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the technical spirit of the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the scope of the technical spirit of the present invention.

In describing the technical idea of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the technical idea of the present invention, the detailed description thereof will be omitted. In addition, numerals (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

In addition, the terms "~ unit", "~ group", "~ ruler", "~ module" as used herein refers to a unit for processing at least one function or operation, which means hardware or software or hardware and It can be implemented in a combination of software.

In addition, it is intended to clarify that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function. Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by.

Hereinafter, embodiments according to the spirit of the present invention will be described in detail.

1 is a view for explaining the power loss generated by the switching operation of the switch, Figure 2 is a view for explaining the concept of soft switching (soft switching) to prevent the power loss.

In FIG. 1, the G1 graph shows a voltage applied to the gate of the switch, and the G2 graph shows a waveform of voltage and current applied to both ends of the switch according to on / off of the switch, and the G3 graph shows both ends of the switch. The power dissipated in the switch depends on the voltage and current applied.

When the switch is turned on due to the voltage applied to the gate in the G1 graph, as shown in the G2 graph, the switch current increases, in which case the switch voltage is continuously applied across both ends of the switch. As in the G3 graph, power loss occurs.

Soft switching is required to prevent this loss of power. In ideal soft switching, when the switch is turned off, the voltage applied to the switch is at its maximum and immediately before the switch is turned on. The voltage applied to the switch drops to zero. Since the switch current rises to the maximum value after the switch is turned on, ideally, no power loss occurs.

In the exemplary embodiment of the present invention, soft switching may be achieved using only a simple circuit such as an op amp or a timer, which will be described below with reference to FIG. 3.

3 is a circuit diagram of a high voltage power supply 300 to which a control circuit according to an embodiment of the inventive concept may be applied.

Referring to FIG. 3, the LLC converter 330 is connected to the first terminal a1 of the input voltage Vin, and a single switch 310 is connected to the second terminal a2 of the input voltage Vin. The input voltage Vin may be, for example, a direct current (DC) voltage source.

The LLC converter 330 is composed of a resonant capacitor Cr, a resonant inductor Lr, a magnetizing inductor Lm, and a transformer 338, and at least one diode D1 and D2 is provided on the secondary side of the transformer 338. Voltage amplifiers 350 including capacitors 351 and 357 are connected.

The switch 310 may be formed of, for example, a MOSFET semiconductor or the like, and according to the switching operation of the switch 310 and the resonance operation of the resonance capacitor Cr and the resonance inductor Lr, the load R0 on the secondary side may be used. The output voltage Vo is applied to it.

According to an embodiment of the inventive concept, the voltage amplifier 350 may include a voltage doubler including a first capacitor 351, a second capacitor 357, a first diode D1, and a second diode D2. Although shown to be, this is only one example. The voltage amplifier 350 may be implemented as a voltage multiplier of various structures.

The control circuit device according to an embodiment of the inventive concept may be connected to the gate terminal 313 of the switch 310 to control the on and off of the switch 310. As described above, the control circuit device may achieve zero voltage switching of the high voltage power supply 300 through voltage application or blocking to the gate terminal 313.

4 is a circuit diagram of a control circuit 400 according to an embodiment of the inventive concept, and FIG. 5 is a diagram illustrating voltages and currents measured at main nodes of the control circuit 400 shown in FIG. 4. .

Referring to FIG. 4, the control circuit 400 according to an embodiment of the present invention may include a first comparator 410, a timer 430, a second comparator 420, and an integrator 440. In addition, the control circuit 400 according to the embodiment of the inventive concept may further include a delay unit 450 and a CMOS inverter 460 according to the embodiment.

Although FIG. 4 briefly illustrates the high voltage power supply 300 for clarity, for example, the gate terminal 313 of the switch 310 of the high voltage power supply 300 shown in FIG. It may be connected to the output side of the control circuit 400.

The first comparator 410 outputs a pulse voltage Vpulse indicating a comparison result of the magnitude of the preset type of voltage. For example, the first comparator 410 may include a magnitude of the input voltage Vin of the high voltage power supply 300 measured by the first sensor 401 and a single switch measured by the second sensor 403. The magnitude of the switch voltage Vds applied to both ends of the 310 may be compared through the comparison element 412, and the pulse voltage Vpulse of a predetermined state corresponding to the comparison result may be output.

The comparison element 412 may include, for example, an Op-Amp. In addition, the first sensor 401 is connected to the terminal of the input voltage Vin of the high voltage power supply 400, the second sensor 403 is connected between both ends of the switch 310, respectively, the input voltage Vin ) And the switch voltage Vds may be applied.

The comparison element 412 outputs a pulse voltage Vpulse in a first state (for example, a high state) when the magnitude of the input voltage Vin is greater than the magnitude of the switch voltage Vds, and the input voltage V When the magnitude of Vin is smaller than the magnitude of the switch voltage Vds, the pulse voltage Vpulse of the second state (for example, the low state) is output. When the first input voltage Vin is applied, since the switch 310 is turned off, the size of the switch voltage Vds is 0, and accordingly, the pulse voltage Vpulse of the first state is output.

The timer 430 turns on the single switch 310 by applying an on signal to the gate 313 of the single switch 310 according to the state of the pulse voltage Vpulse output from the first comparator 410. The operation of the timer unit 430 will be described later.

The second comparator 420 outputs an error voltage Ve corresponding to a difference in the magnitude of the preset type of voltage. For example, the second comparator 420 may measure the magnitude of the output voltage Vo of the high voltage power supply 300 measured by the third sensor 405 through the comparison element 422 and the preset reference voltage Vref. The error voltage Ve corresponding to the difference between the magnitudes of?) Is output. The comparator 422 of the second comparator 420 may be made of Op-Amp. In addition, the third sensor 405 may be connected to the load Ro of the high voltage power supply 300 to receive the output voltage Vo.

The integrator 440 accumulates and transmits the voltage of the ON signal output from the timer 430 to the timer 430. As shown, the integrator 440 may be composed of a VCCS (Voltage Controlled Current Source) 442, a discharge transistor 444 and a capacitor 446, the structure of the integrator 440 is limited thereto. However, various types of circuits capable of accumulating the applied voltage may be used.

As described above, the timer unit 430 applies an ON signal to the gate 313 of the single switch 310 according to the state of the pulse voltage Vpulse of the first comparator 410. The 430 may include a first comparison element 431, a second comparison element 433, and an on / off control element 435. The first comparison element 431 and the second comparison element 433 may be made of Op-Amp, and the on / off control element 435 may be made of an SR latch element.

The pulse voltage Vpulse of the first comparator 410 is input to one terminal of the first comparator 431, and the other terminal of the first comparator 431 is derived from a preset Vcc. A voltage of magnitude is applied. When the pulse voltage Vpulse of the first state output from the first comparator 410 is applied to the first comparator 431, the first comparator 431 is in a first state (for example, a high state). The setting signal is transmitted to the on / off control element 435.

An error voltage Ve, which is an output from the second comparator 420, is applied to one terminal of the second comparator 433, and an accumulating voltage, which is an output from the integrator 440, is applied to the other terminal. Vint) is applied. If the cumulative voltage Vin increases gradually over time and becomes equal to the magnitude of the error voltage Ve, the second comparison element 433 outputs a reset signal to the on / off control element 435.

The on / off control element 435 transmits an on signal to the gate 313 when the setting signal of the first state is received from the first comparison element 431, and is then reset by the second comparison element 433. When the signal is output, the application of the on signal is blocked to turn off the single switch 310. Accordingly, the accumulated voltage Vint of the integrator 440 is initialized, and the reset signal is no longer output from the second comparison element 433.

When the single switch 310 is turned off, the magnitude of the switch voltage Vds applied to both ends of the switch 310 is gradually increased according to the resonance of the resonant capacitor Cr and the resonant inductor Lr. When the magnitude of Vds becomes greater than the magnitude of the input voltage Vin, the first comparator 410 outputs a pulse voltage Vpulse in a second state (for example, a low state) and the second state. The first comparison element 431 which has received the pulse voltage Vpulse transmits a setting signal of a second state (for example, a low state) to the on / off control element 435. The on / off control element 435 maintains the on signal blocking state to the gate 313 in accordance with the setting signal of the second state.

After that, when the resonance of the resonant capacitor Cr and the resonant inductor Lr ends, the magnitude of the switch voltage Vds decreases, and when the magnitude of the switch voltage Vds becomes lower than the magnitude of the input voltage Vin. The first comparator 410 outputs the pulse voltage Vpulse of the first state again so that the switch 310 is turned on.

The operation of the above-described control circuit 400 will be described in chronological order as follows.

1) When the first input voltage Vin is applied, since the switch 310 is turned off, the switch voltage Vds is 0, and accordingly, the pulse voltage Vpulse of the first state is output from the first comparator 410. do.

2) Since the pulse voltage Vpulse of the first state is output, a signal from the on / off control element 435 is applied to the gate 313 so that the switch 310 is turned on.

3) Since the on signal is applied to the gate 313, the voltage of the on signal is accumulated by the integrator 440, and accordingly, the accumulated voltage Vint increases linearly.

4) When the accumulated voltage Vin reaches the error voltage Ve, a reset signal is output from the second comparison element 433 and applied to the on / off control element 435.

5) When the reset signal is applied to the on / off control element 435, the on signal applied to the gate 313 is blocked so that the integrator 440 is initialized and the switch 310 is turned off. It can be seen that the turn on time of the switch 310 is proportional to the magnitude of the error voltage Ve.

6) When the switch voltage Vds increases with the resonance of the resonant capacitor Cr and the resonant inductor Lr, and the switch voltage Vds becomes larger than the magnitude of the input voltage Vin, from the first comparator 410 The pulse voltage Vpulse of the second state is output.

7) After the resonance is completed, when the switch voltage Vds becomes smaller than the magnitude of the input voltage Vin, the pulse voltage Vpulse of the first state is output from the first comparator 410, and accordingly, the switch 310 Is turned on. Thereafter, steps 3) to 7) are repeatedly performed.

As described above, the control circuit 400 may further include a delay 450 and a CMOS inverter 460. The delayer 450 adjusts the timing of signals applied to the on / off control element 435 by delaying the pulse voltage Vpulse output from the first comparator 410. In addition, the CMOS inverter 460 is provided for applying the on signal output from the on / off control element 435 to the gate 313 without a level shift.

6A to 6D are diagrams for describing an equivalent circuit for each operation mode of the high voltage power supply device 300 to which the control circuit 400 is applied according to an embodiment of the inventive concept.

Mode 1: T0-T1

Since the voltage Vgate is applied to the gate 313 when the time t is T0, the switch 310 is turned on, the first diode D1 is turned on, and the second diode D2 is turned off. It is assumed that the inductance Lm of the magnetizing inductor Lm is large enough to ignore ripple.

The magnetization current I _Lm flowing through the magnetization inductor Lm becomes a constant I _Lm = Iin = Po / Vin, and the voltage applied to the resonance capacitor Cr also becomes a constant Vcr (t) = − Vin. The voltage applied to the magnetizing inductor Lm is clamped to (Vo-Vc) / N due to the turn-on of the first diode D1.

The current I _Lr (t) flowing through the resonant inductor Lr and the current I _D1 (t) flowing through the first diode D1 may be expressed by Equation 1 below.

When time t reaches T1, switch 310 is turned off and I _Lr (t) is at its peak value.

Mode 2: T1-T2

When t becomes T1, the switch 310 is turned off, the first diode D1 is turned on, and the second diode D2 is turned off. Resonance of the resonant capacitor Cr and the resonant inductor Lr occurs, so that the current I _Lr flowing through the resonant inductor Lr decreases, and the switch voltage Vds increases.

The voltage applied to the magnetizing inductor Lm is clamped to (Vo-Vc) / N since the first diode D1 is turned on.

The magnitude of the current I _Lr (t) flowing through the resonant inductor Lr and the voltage Vcr (t) applied to the resonant capacitor Cr may be expressed by Equation 2 below.

, 여기서 초기 조건으로서, I_Lr(0)은 I_Lr의 피크 값, Vcr(0)은 -Vin이다. 또한 Cr은 공진 커패시터의 커패시턴스이다.

, Where as an initial condition, I _Lr (0) is the peak value of I _Lr and Vcr (0) is -Vin. Cr is also the capacitance of the resonant capacitor.

If t is the T2, I _Lr is reduced to I _Lm, mode 2 is terminated.

Mode 3: T2-T3

When t becomes T2, the first diode D1 is turned off and the second diode D2 is turned on. Since the resonance between the resonant capacitor Cr and the resonant inductor Lr continues to be maintained, I _Lr decreases, Vcr increases to reach the peak, and then decreases again. Since the second diode D2 is turned on, the voltage applied to the magnetizing inductor Lm is clamped to -Vc / N.

The current I _Lr (t) flowing through the resonant inductor Lr and the voltage Vcr (t) applied to the resonant capacitor Cr may be expressed by Equation 3 below.

, 초기 조건으로서, I_Lr(0)은 Iin이고, Vcr(0)은 Vcr(T2)이다.

, As an initial condition, I _Lr (0) is Iin and Vcr (0) is Vcr (T2).

The switch voltage (Vds = Vin + Vcr) reaches a peak and then decreases to zero. When t reaches T3, the switch voltage Vds decreases to zero, and mode 3 ends.

Mode 4: T3-T4

In mode 4 zero voltage switching occurs. When t becomes T3, the first diode D1 is turned off, the second diode D2 is turned on, and the anti-parallel diode of the switch 310 is energized. The switch voltage Vds is kept at zero.

The current I _Lr (t) flowing in the resonant inductor Lr increases linearly, and the voltage Vcr (t) applied to the resonant capacitor Cr is maintained at −Vin. The current I _Lr (t) flowing through the resonant inductor Lr may be expressed by Equation 4 below.

When t becomes T4, the first diode D1 is turned on and the second diode D2 is turned off. After that, the mode is executed again.

FIG. 7 is a diagram illustrating experimental results of a high voltage power supply device 300 to which a control circuit 400 according to an embodiment of the inventive concept is applied. In FIGS. 7A to 7D, I (MOS1) is a current flowing through the switch 310.

FIG. 7A is a graph measured when the input voltage Vin is 24V and the load Ro is 1350 * 10 ¹⁶ Ω. The output voltage Vo is regulated to 60kV and the switching frequency is 132 kHz. The turn-off time interval of the switch 310 was 1.4us, and the turn-on time interval of the switch 310 was measured to be 5.9us.

7B is a graph measured when the input voltage is 21V and the resistance of the load is 1350 * 10 ¹⁶ Ω. The output voltage Vo is regulated to 60kV, the switching frequency is 135kHz, and the switch 310 The turn-off time interval of is 1.35us, and the turn-on time interval of the switch 310 was measured to be 6.0us.

7C is a graph measured when the input voltage is 24V and the resistance of the load is 1350 * 10 ¹⁰ Ω. The output voltage Vo is regulated to 60kV, the switching frequency is 126kHz, and the switch 310 The turn-off time interval of is 1.43us, and the turn-on time interval of the switch 310 was measured to be 6.50us.

FIG. 7D is a graph measured when the input voltage is 26.5 V and the load resistance is 1350 * 10 ¹⁶ Ω. The output voltage Vo is regulated to 60 kV, and the switching frequency is 162 kHz. The turn-off time interval of) is 1.4us, and the turn-on time interval of the switch 310 is measured to be 4.75us. In FIGS. 7A to 7D, it was confirmed that zero voltage switching was achieved.

As mentioned above, although the technical idea of the present invention has been described in detail with reference to a preferred embodiment, the technical idea of the present invention is not limited to the above embodiments, and having ordinary skill in the art within the scope of the technical idea of the present invention. Many modifications and variations are possible.

300: high voltage power supply
310: single switch
330: LLC converter
338: transformer
350: voltage amplifier
400: control circuit
410: first comparator
420: second comparator
430: timer unit
440: integrator
450: delay
460: CMOS inverter

Claims (18)

A control circuit arrangement for zero voltage switching of a high voltage power supply having a single switch,
A first comparator comparing the input voltage of the high voltage power supply with a magnitude of the switch voltage applied to both ends of the single switch, and outputting a pulse voltage corresponding to the comparison result;
A timer unit applying an ON signal to a gate of the single switch according to the magnitude of the pulse voltage output from the first comparator; And
And a second comparator configured to output an error voltage corresponding to a difference between an output voltage of the high voltage power supply and a preset reference voltage.
The timer unit cuts off an ON signal applied to the gate according to a result of comparing the magnitude of the error voltage output from the second comparator with the magnitude of the accumulated voltage of the ON signal. .
delete The method of claim 1,
The first comparator,
If the input voltage of the high voltage power supply is greater than the size of the switch voltage, and outputs a pulse voltage of the first state,
The timer unit,
And an on signal is applied to the gate of the single switch according to the pulse voltage of the first state.
The method of claim 1,
The first comparator,
And outputting a pulse voltage in a second state when the size of the switch voltage is greater than the input voltage of the high voltage power supply as the single switch is blocked due to the blocking of the on signal.
The method of claim 1,
The timer unit,
A first comparing element which outputs a setting signal of a predetermined state according to the state of the pulse voltage;
An on / off control element for applying an on signal to a gate of the single switch according to a setting signal of a first state; And
And a second comparison element receiving the accumulated voltage and the error voltage and outputting a reset signal to the on / off control element according to a comparison result of the magnitude of the accumulated voltage and the error voltage.
The method of claim 5,
The on / off control element,
And controlling the application of the on signal in response to the reset signal.
The method of claim 5,
The on / off control element,
A control circuit device comprising an SR latch element.
The method of claim 1,
The control circuit device,
And an integrator that accumulates and transmits the voltage of the on signal to the timer unit.
The method of claim 1,
The control circuit device,
And a delayer for delaying the pulse voltage output from the first comparator.
The method of claim 1,
The control circuit device,
And a CMOS inverter for transmitting the ON signal output from the timer unit to the gate of the single switch.
High voltage power supply,
An LLC converter coupled to a first node of an input voltage of the high voltage power supply;
A single switch connected to the second node of the input voltage;
A voltage amplifier connected to the secondary side of the transformer of the LLC converter; And
A control circuit connected to the gate terminal of the single switch to control switching of the single switch,
The control circuit,
A first comparator comparing the input voltage with a magnitude of a switch voltage applied to both ends of the single switch, and outputting a pulse voltage indicating a comparison result;
A timer unit applying an ON signal to a gate of the single switch according to the magnitude of the pulse voltage output from the first comparator; And
A second comparator configured to output an error voltage corresponding to a difference between an output voltage of the high voltage power supply and a preset reference voltage,
The timer unit cuts off the ON signal applied to the gate according to a result of comparing the magnitude of the error voltage and the magnitude of the accumulated voltage of the ON signal.
delete The method of claim 11,
The first comparator,
Outputting a pulse voltage of a first state if the input voltage is greater than the magnitude of the switch voltage,
The timer unit,
And applying an on signal to the gate of the single switch according to the pulse voltage of the first state.
The method of claim 11,
The first comparator,
And when the magnitude of the switch voltage is greater than that of the input voltage as the single switch is blocked due to the blocking of the on signal, a pulse voltage in a second state is output.
The method of claim 11,
The timer unit,
A first comparing element which outputs a setting signal of a predetermined state according to the state of the pulse voltage;
An on / off control element for applying an on signal to a gate of the single switch according to a setting signal of a first state; And
And a second comparison element receiving the accumulated voltage and the error voltage and outputting a reset signal to the on / off control element according to a comparison result of the magnitude of the accumulated voltage and the error voltage. .
The method of claim 11,
The control circuit,
And an integrator that accumulates and transmits the voltage of the on signal to the timer unit.
The method of claim 11,
The control circuit,
And a delayer for delaying the pulse voltage output from the first comparator.
The method of claim 11,
The control circuit,
And a CMOS inverter for transmitting the ON signal output from the timer unit to the gate of the single switch.

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