CN114616751A - Power supply circuit and working method thereof - Google Patents
Power supply circuit and working method thereof Download PDFInfo
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- CN114616751A CN114616751A CN202180004928.5A CN202180004928A CN114616751A CN 114616751 A CN114616751 A CN 114616751A CN 202180004928 A CN202180004928 A CN 202180004928A CN 114616751 A CN114616751 A CN 114616751A
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- 230000003111 delayed effect Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 6
- 230000007423 decrease Effects 0.000 description 9
- 238000012545 processing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 3
- YVWNECBAHBJBSI-HZOWPXDZSA-N (2E,4E)-2,4,6-trimethyldeca-2,4-dienamide Chemical compound CCCCC(C)\C=C(/C)\C=C(/C)C(N)=O YVWNECBAHBJBSI-HZOWPXDZSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
Abstract
A power supply circuit and a method of operating the power supply circuit are provided in which overshoot of an output voltage does not occur. A power supply circuit (1) is provided with: the step-up switching regulator (3) includes an insulation switching regulator (4), the insulation switching regulator (4) includes a feedback circuit (5) including a Photo Coupler (PC) and a Shunt Regulator (SR), the feedback circuit (5) includes a switching circuit that automatically switches a target voltage of an output voltage (Vt) of the insulation switching regulator (4) from a 1 st target voltage (V1) to a 2 nd target voltage (V2) higher than the 1 st target voltage (V1).
Description
Cross reference to related applications
The present application claims priority to the filing of japanese patent application having the title "power supply circuit and method of operating a power supply circuit" in japanese patent office, application No. 2020-.
Embodiments of the present application relate to a power supply circuit and a method of operating the power supply circuit.
As the display screen of the television receiver is increased in size, a power supply circuit for supplying power to the display panel is also increased in power. The power supply circuit has a step-up switching regulator and an insulating switching regulator using an output voltage of the step-up switching regulator as an input. The boost switching regulator requires time until a standard voltage is generated at the time of startup.
As described later, if the boost switching regulator is started at the same time as the insulating switching regulator or the starting order is reversed, the input voltage to the insulating switching regulator becomes low at the time of starting. Therefore, it takes time for the output voltage of the insulated switching regulator to rise, and the feedback circuit portion of the insulated switching regulator does not operate normally, so that there is a risk of overshoot (overshoot) in the output voltage of the insulated switching regulator.
For example, the above-described problem can be solved by preparing a dedicated power supply circuit for the step-up switching regulator, or supplying power from a separate unit to the insulating switching regulator, thereby starting the insulating switching regulator after a predetermined time has elapsed since the step-up switching regulator was started.
However, in the above-described solution, since a dedicated power supply circuit or a wiring cable and a connector from a separate unit are required, the structure becomes complicated, and the cost of the power supply circuit becomes high.
Prior art documents
Patent document
Patent document 1: japanese patent No. 5743244
Patent document 2: japanese patent laid-open publication No. 2007-078900
Disclosure of Invention
An object of the embodiments of the present application is to provide a power supply circuit and an operating method of the power supply circuit, which prevent overshoot of an output voltage at startup with a simple configuration.
A power supply circuit according to an embodiment of the present application includes a step-up switching regulator having a feedback circuit including a photocoupler and a parallel regulator (Shunt regulator), and an insulated switching regulator including a switching circuit that automatically switches a target voltage of an output voltage of the insulated switching regulator from a 1 st target voltage to a 2 nd target voltage higher than the 1 st target voltage.
A method for operating a power supply circuit according to another embodiment of the present application, when starting a power supply circuit including a step-up switching regulator and an insulated switching regulator including a feedback circuit including a photocoupler and a parallel regulator, includes: a 1 st step in which the feedback circuit performs control so that an output voltage of the power supply circuit becomes a 1 st target voltage; a 2 nd step of applying a voltage equal to or higher than a threshold voltage equal to or lower than the 1 st target voltage to an on/off switch included in the feedback circuit and turned on at the threshold voltage through a delay circuit including a capacitor, thereby turning the on/off switch on and switching the target voltage to a 2 nd target voltage higher than the 1 st target voltage; and a 3 rd step of controlling the feedback circuit so that the output voltage becomes the 2 nd target voltage in the 3 rd step.
Fig. 1 is a configuration diagram of a television receiver including a power supply circuit of the embodiment;
fig. 2 is a circuit diagram of a conventional power supply circuit;
fig. 3 is a diagram for explaining an operation at the time of starting up the conventional power supply circuit;
FIG. 4 is a circuit diagram of a power supply circuit of an embodiment;
fig. 5 is a diagram for explaining an operation at the time of starting the power supply circuit according to the embodiment.
Description of the reference numerals
1. 101 … power supply circuit, 2 … rectification circuit, 3 … boost switching regulator, 4, 104 … insulation switching regulator, 5, 105 … feedback circuit, 9 … television receiver, 91 … signal processing power supply circuit, 92 … signal processing circuit, 93 … panel control circuit, 94 … display panel, C0, C1, C2 … capacitor, D1, D2 … diode, IC1, IC2 … control IC, PC … photocoupler, R1-R5 … resistance, SR … shunt regulator, SW … switch, TR … transformer.
Fig. 1 is a configuration diagram of a television receiver 9 according to an embodiment of the present application. Power is supplied to the television receiver 9 from a commercial power supply 8 such as AC 100V. The power is converted into a standard DC voltage by the signal processing power supply circuit 91, and supplied to the signal processing circuit 92. The signal processing circuit 92 receives television broadcasts received by an antenna (not shown). The signal processing circuit 92 may also receive internet broadcasting via a network line. The signal processing circuit 92 performs signal processing on the received broadcast signal, and outputs an image signal and a sound signal. The video signal is output to the display panel 94, the audio signal is output to a speaker (not shown), and the viewer views the program. The display panel 94 is, for example, an OLED panel or a liquid crystal panel.
The display panel 94 is supplied with power converted into a standard DC voltage by the panel power supply circuit 1 (hereinafter referred to as "power supply circuit 1") via the panel control circuit 93.
< conventional Power supply Circuit >
First, a conventional power supply circuit 101 used in a television receiver as in the power supply circuit 1 will be described. The power supply circuit 101 shown in fig. 2 includes a rectifier circuit 2, a boost switching regulator 3, and an isolation switching regulator 104 including a feedback circuit 105. Fig. 2 and the like are simple circuit diagrams, and not all of the electronic components are shown.
The rectifier circuit 2 includes: a diode bridge that rectifies and outputs alternating-current power supplied from a commercial power supply; and a capacitor for smoothing the rectified voltage output from the diode bridge.
Although detailed description is omitted, the boost-type switching regulator 3 boosts the voltage output from the rectifier circuit 2 to a standard voltage.
In the isolation type switching regulator 104, based on the input voltage Vin applied from the boosting type switching regulator 3, the control IC (IC2) drives the 2 switching elements SW-A, SW-B based on the feedback voltage Vfb controlled by the feedback circuit 105, thereby applying a rectangular wave signal of a predetermined frequency to the primary side coil of the transformer TR. The induced current generated in the secondary winding of the transformer TR passes through the 2 diodes D1 and D2 and the capacitor C0, and becomes an OUTPUT (OUTPUT) of the OUTPUT voltage Vout.
In the steady-state operation, the driving voltage Vcc is applied from the transformer TR to the control IC (IC1) of the boost switching regulator 3 and the control IC (IC2) of the isolation switching regulator 104. At the time of start-up, although not shown, the drive voltage Vcc is generated by an internal start-up circuit of the control IC (IC 2).
The feedback circuit 105 includes a Photo Coupler (PC), a parallel regulator (SR), and resistors R1, R2. The connection point of the 2 resistors R1 and R2 connected in series is connected to the reference electrode terminal (REF terminal) of the parallel regulator (SR). The feedback circuit 105 uses a Photo Coupler (PC) to control the FB voltage Vfb applied to the feedback terminal of the control IC (IC 2). When the Photo Coupler (PC) is turned on, the FB voltage Vfb applied to the feedback terminal decreases. In addition, insulation of the primary side circuit and the secondary side circuit of the transformer TR is ensured by a Photo Coupler (PC). The reference potential of the primary side circuit is a ground potential (earth), and the reference potential of the secondary side circuit is a ground potential (ground).
The target voltage Vt of the power supply circuit 101 automatically controlled by the feedback circuit 105 is represented by the following expression. REF is the reference voltage of the Shunt Regulator (SR), R1Is the resistance value of the resistor R1, R2Is the resistance value of the resistor R2.
Vt＝REF×(R 1+R 2)/R 2
That is, the target voltage Vt can be set to an arbitrary voltage by selecting the resistance values of the 2 resistors R1 and R2. For example, when the reference voltage REF of the parallel regulator (SR) is 2.5V, the resistor R1 is 9k Ω, and the resistor R2 is 1k Ω, the target voltage Vt is 25V.
When the output voltage Vout is higher than the target voltage Vt, a voltage equal to or higher than the reference voltage REF is applied to a REF terminal of the parallel regulator (SR), and a current Ik flows from the cathode K to the anode A according to the control voltage Vref. The photo coupler PC emits light with an intensity corresponding to the current Ik flowing through the parallel regulator (SR). Therefore, the FB voltage Vfb applied to the FB terminal of the control IC (IC2) decreases according to the light emission intensity of the photo coupler PC. That is, the control IC (IC2) controls the switching element SW-A, SW-B so as to decrease the output voltage Vout when the FB voltage Vfb decreases.
< actions of conventional Power supply Circuit >
The operation of the conventional power supply circuit 101 will be described with reference to fig. 3.
When power is supplied from the commercial power source at time T0 (at the time of startup) in the power supply circuit 101, the dc output from the rectifier circuit 2 is input to the step-up switching regulator 3 and the insulating switching regulator 104. The insulated switching regulator 104 starts a switching operation, and the output voltage Vout starts to rise.
The booster switching regulator 3 that supplies large electric power requires a predetermined start-up time. That is, a predetermined time is required until the voltage Vin input to the insulating switching regulator 104 rises to a standard voltage after the power is supplied to the step-up switching regulator 3.
That is, in fig. 3, the output voltage Vout of the insulated switching regulator 104 is lower than the target voltage Vt from time T0 to time T1. Therefore, since the Photodiode (PC) of the feedback circuit 105 does not light up, the FB voltage Vfb rises as shown in fig. 3, and accordingly, the output voltage Vout also rises.
When the output voltage Vout becomes higher than the target voltage Vt at time T1, the Photodiode (PC) is turned on by a current Ik corresponding to the control voltage Vref of the insulated switching regulator 104. However, the lowering of the FB voltage Vfb that has risen greatly takes time. Therefore, even if the output voltage Vout becomes higher than the target voltage Vt, the insulated-type switching regulator 104 operates to increase the output voltage Vout by the time T2.
In the power supply circuit 101, an overshoot of the output voltage Vout occurs until the FB voltage Vfb decreases and the feedback circuit 105 performs a steady-state operation. Therefore, the power supply circuit 101 may adversely affect the display panel 94 having a voltage tolerance.
After time T2, the output voltage Vout drops to the target voltage Vt, and then the steady-state operation is performed. That is, since the feedback voltage Vfb increases when the output voltage Vout becomes lower than the target voltage Vt, the insulated-type switching regulator 104 operates to increase the output voltage Vout. Since the feedback voltage Vfb decreases when the output voltage Vout becomes higher than the target voltage Vt, the insulated switching regulator 104 operates to decrease the output voltage Vout. At this time, although not shown, the Photo Coupler (PC) may be turned off.
Moreover, by increasing the capacity of the phase compensation capacitor C1 shown in fig. 2, the occurrence of overshoot can be prevented. However, the response of the feedback circuit becomes poor, so that the performance of the power supply circuit is degraded.
< Power supply Circuit of embodiment >
The power supply circuit 1 of the embodiment shown in fig. 4 includes a rectifier circuit 2, a step-up switching regulator 3, and an insulating switching regulator 4 including a feedback circuit 5. The power supply circuit 1 differs from the power supply circuit 101 only in the feedback circuit of the insulated switching regulator 4. Therefore, the description of the same configuration as that of the power supply circuit 101 is omitted.
The feedback circuit 5 includes a switching circuit that automatically switches the target voltage Vt of the output voltage Vout of the insulated switching regulator 4 from the 1 st target voltage V1 to the 2 nd target voltage V2 higher than the 1 st target voltage V1.
That is, the feedback circuit 5 includes a switch circuit including resistors R3, R4, R5, a switch SW, and a capacitor C2, in addition to the configuration including the feedback circuit 105. A resistor R3 having one end connected to the reference electrode terminal (REF terminal) of the shunt regulator SR is connected in parallel to the resistor R2 via the switch SW.
The switch SW is an ON/OFF switch (hereinafter referred to as an ON/OFF switch) that is turned ON when a voltage equal to or higher than a threshold voltage Vth is applied to an ON terminal. The output voltage Vout of the insulated switching regulator 4 is divided by resistors R4 and R5, and a voltage Vsw is applied to the ON terminal of the switch SW. That is, the voltage Vsw applied to the switch SW is expressed by the following equation. R4Is the resistance value of the resistor R4, R5Is the resistance value of the resistor R5.
Vsw＝Vout×(R 4+R 5)/R 5
When the switch SW is OFF (disconnected), the target voltage V1 of the power supply circuit 1 is expressed by the following equation, as is the target voltage Vt of the power supply circuit 101.
V1＝REF×(R 1+R 2)/R 2
For example, when the reference voltage REF of the parallel regulator (SR) is 2.5V, the resistor R1 is 9k Ω, and the resistor R2 is 2k Ω, the 1 st target voltage V1 becomes 13.75V.
The switch SW is configured to increase the number of resistors connected to a reference electrode terminal (REF terminal) of the parallel regulator SR when turned ON (conductive state). Therefore, the 2 nd target voltage V2 of the power supply circuit 1 in which the switch SW is ON is expressed by the following expression. R3Is the resistance value of the resistor R3.
V2＝REF×((R 1×R 2)+(R 1×R 3)+(R 2×R 3))/(R 2×R 3)
For example, in the case where the resistance R3 is 2k Ω, the 2 nd target voltage V2 is 25V. The 2 nd target voltage V2 is the standard output voltage Vout of the power supply circuit 1.
The switch circuit includes a capacitor C2, and the capacitor C2 delays the application speed of the voltage Vsw to the ON terminal of the switch SW. The resistors R4 and R5 and the capacitor C2 form a delay circuit.
< action of Power supply Circuit >
The operation of the power supply circuit 1 will be described with reference to fig. 5.
Similarly to the power supply circuit 101, when power is supplied from a commercial power supply at time T0, the power supply circuit 1 sequentially applies voltages to the step-up switching regulator 3, the insulation switching regulator 4, and the feedback circuit 5 via the rectifier circuit 2.
As shown in fig. 5, at time T0, the voltage application to the step-up switching regulator 3 is started. However, by the time T1, the output voltage Vout of the insulated switching regulator 4 is lower than the 1 st target voltage V1. Therefore, since the Photodiode (PC) of the feedback circuit 105 does not light up, the FB voltage Vfb rises, and accordingly, the output voltage Vout also rises.
When the output voltage Vout reaches the 1 st target voltage V1 at time T1, a current flows through the photo-coupler (PC), and the feedback voltage Vfb starts to decrease.
The 1 st target voltage V1 is lower than the 2 nd target voltage V2, and the time T1 until the output voltage Vout reaches the 1 st target voltage V1 is shorter than the time T1 in the conventional power supply circuit 101. In the power supply circuit 1, the FB voltage Vfb at time T1 rises only to Vfb 1. Therefore, at time T2 when the prescribed time has elapsed from time T1, the FB voltage Vfb decreases to Vfb 2.
The time T2 is the time when the switch SW is turned ON. When the switch SW is turned ON, the target voltage is switched from the 1 st target voltage V1 to the 2 nd target voltage V2.
The switch SW performs an ON operation at a threshold voltage Vth equal to or lower than the 1 st target voltage V1, but a predetermined delay time is present until the ON operation is performed. That is, since the delay circuit constituted by the capacitor C2 and the resistors R4 and R5 has a predetermined time constant, the increase speed of the output voltage Vout applied to the switch SW is delayed.
That is, the time T2 is a time after a predetermined time based on the delay time of the delay circuit has elapsed after the 1 st target voltage V1 is reached.
The predetermined time until the target voltage Vt is automatically switched from the 1 st target voltage V1 to the 2 nd target voltage V2, that is, the time (delay time) from the time T1 to the time T2 is set to, for example, 10 μ sec to 500m sec, or 100 μ sec to 20m sec, depending on the specification of the power supply circuit 1.
At time T3, when the output voltage Vout reaches the target voltage V2(Vt), the power supply circuit 1 is controlled to be in a normal state.
As described above, the method of operating the power supply circuit 1 includes: a 1 st step of performing control so that the output voltage Vout of the power supply circuit 1 becomes a 1 st target voltage V1 in the 1 st step; a 2 nd step of switching the ON/OFF switch SW included in the feedback circuit 5 to an ON state at a threshold voltage Vth at which the output voltage Vout is equal to or lower than the 1 st target voltage V1 to a 2 nd target voltage V2 higher than the 1 st target voltage V1 by applying a voltage equal to or higher than the threshold voltage to the ON state after a predetermined time has elapsed after the output voltage Vout becomes the 1 st target voltage V1 by a delay circuit including a capacitor C1; and a 3 rd step of performing control so that the output voltage Vout becomes the 2 nd target voltage V2 in the 3 rd step.
The 1 st target voltage V1 may be 10% to 90% of the 2 nd target voltage V2, and may be 30% to 70% of the 2 nd target voltage V2. If the 1 st target voltage V1 is within the above range, it is easy to design that the output voltage Vout does not overshoot at the time of startup.
The threshold voltage Vth of the switch SW may be a threshold voltage that is turned ON when 50% or more of the 1 st target voltage V1 is reached. If the threshold voltage Vth is above the above range, it is easy to design to perform switching from the 1 st target voltage V1 to the 2 nd target voltage V2.
The power supply circuit 1 switches the target voltage at startup from the 1 st target voltage V1 to the 2 nd target voltage V2 using a switch circuit having a small number of electronic elements. The power supply circuit 1 can prevent overshoot of the output voltage Vout at the time of startup with a simple configuration.
The power supply circuit according to the embodiment of the present application may include a switching circuit that controls the target voltage Vt in 3 steps or more. For example, the power supply circuit may also have a switching circuit that automatically switches the target voltage Vt to a 3 rd target voltage V3 that is greater than the 1 st target voltage V1 and less than the 2 nd target voltage V2. The switching circuit has a 2 nd switching circuit having a different threshold voltage in parallel with the switching circuit of the power supply circuit 1.
Some embodiments of the present application have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments may be implemented in other various forms, and various omissions, substitutions, and changes may be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the technical means described in the claims and the equivalent scope thereof.
Claims (5)
- A power supply circuit, wherein,the device comprises a step-up switching regulator and an insulated switching regulator, wherein the insulated switching regulator comprises a feedback circuit including a photocoupler and a parallel regulator,the feedback circuit includes a switching circuit that automatically switches a target voltage of an output voltage of the insulated switching regulator from a 1 st target voltage to a 2 nd target voltage higher than the 1 st target voltage.
- The power supply circuit of claim 1,the switching circuit has an on/off switch configured to increase the number of resistors connected to a reference electrode terminal of the parallel regulator,the on/off switch is turned on at a threshold voltage at which the output voltage is equal to or lower than the 1 st target voltage.
- The power supply circuit of claim 2,the switch circuit includes a capacitor, and a voltage applied to the on/off switch is delayed by a delay circuit including the capacitor.
- The power supply circuit of claim 1,the switching circuit automatically switches a target voltage of an output voltage of the insulated switching regulator to a 3 rd target voltage that is greater than the 1 st target voltage and less than the 2 nd target voltage.
- A method of operating a power supply circuit, wherein,when a power supply circuit including a step-up switching regulator and an insulated switching regulator having a feedback circuit including a photocoupler and a parallel regulator is started, the power supply circuit includes:a 1 st step of controlling the feedback circuit so that an output voltage of the power supply circuit becomes a 1 st target voltage;a 2 nd step of applying a voltage equal to or higher than a threshold voltage equal to or lower than the 1 st target voltage to an on/off switch included in the feedback circuit and turned on at the threshold voltage through a delay circuit including a capacitor, thereby turning the on/off switch on and switching the target voltage to a 2 nd target voltage higher than the 1 st target voltage; andand a 3 rd step of controlling the feedback circuit so that the output voltage becomes the 2 nd target voltage in the 3 rd step.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-171424 | 2020-10-09 | ||
| JP2020171424A JP7229979B2 (en) | 2020-10-09 | 2020-10-09 | Power supply circuit and method of operation of the power supply circuit |
| PCT/CN2021/111983 WO2022073381A1 (en) | 2020-10-09 | 2021-08-11 | Power supply circuit and working method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114616751A true CN114616751A (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180004928.5A Pending CN114616751A (en) | 2020-10-09 | 2021-08-11 | Power supply circuit and working method thereof |
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| Country | Link |
|---|---|
| JP (1) | JP7229979B2 (en) |
| CN (1) | CN114616751A (en) |
| WO (1) | WO2022073381A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226775A (en) * | 2006-12-28 | 2008-07-23 | 三星电子株式会社 | High-voltage generation circuit and method for reducing overshoot of output voltage |
| CN105553292A (en) * | 2015-12-31 | 2016-05-04 | 广州金升阳科技有限公司 | Two-stage control method, two-stage controller and AC/DC switching power supply |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3809266B2 (en) * | 1997-12-04 | 2006-08-16 | キヤノン株式会社 | High pressure generator |
| JP5129651B2 (en) * | 2008-05-27 | 2013-01-30 | パナソニック株式会社 | High pressure discharge lamp lighting device and lighting fixture |
| CN202309501U (en) * | 2011-10-18 | 2012-07-04 | 康佳集团股份有限公司 | Circuit for restraining overshoot output by switch power supply |
| CN102638184A (en) * | 2012-04-27 | 2012-08-15 | 矽力杰半导体技术(杭州)有限公司 | High-efficiency alternating current-direct current voltage converting circuit |
| JP6840516B2 (en) * | 2016-11-18 | 2021-03-10 | キヤノン株式会社 | Power supply device and image forming device |
-
2020
- 2020-10-09 JP JP2020171424A patent/JP7229979B2/en active Active
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2021
- 2021-08-11 CN CN202180004928.5A patent/CN114616751A/en active Pending
- 2021-08-11 WO PCT/CN2021/111983 patent/WO2022073381A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226775A (en) * | 2006-12-28 | 2008-07-23 | 三星电子株式会社 | High-voltage generation circuit and method for reducing overshoot of output voltage |
| CN105553292A (en) * | 2015-12-31 | 2016-05-04 | 广州金升阳科技有限公司 | Two-stage control method, two-stage controller and AC/DC switching power supply |
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| Publication number | Publication date |
|---|---|
| JP7229979B2 (en) | 2023-02-28 |
| JP2022063082A (en) | 2022-04-21 |
| WO2022073381A1 (en) | 2022-04-14 |
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Application publication date: 20220610 |