CN114374323A - Isolated power supply circuit and electronic equipment - Google Patents
Isolated power supply circuit and electronic equipment Download PDFInfo
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- CN114374323A CN114374323A CN202011103047.2A CN202011103047A CN114374323A CN 114374323 A CN114374323 A CN 114374323A CN 202011103047 A CN202011103047 A CN 202011103047A CN 114374323 A CN114374323 A CN 114374323A
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- power supply
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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
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses keep apart power supply circuit and electronic equipment, wherein, keep apart power supply circuit includes the PWM controller, transformer and feedback circuit, feedback circuit's input is connected with the secondary of transformer, feedback circuit's output is connected with the feedback pin of PWM controller, feedback circuit acquires gives the PWM controller after the actual output voltage of secondary, the output signal of PWM controller regulation switch control pin is so that change the input voltage on primary side according to the relation between actual output voltage and the ideal voltage, and then adjusts actual output voltage. By applying the technical scheme, the actual output voltage can be kept in a stable state, and the anti-interference performance of the isolation power supply is enhanced.
Description
Technical Field
The present application relates to the field of electronic technologies, and in particular, to an isolated power circuit and an electronic device.
Background
With the rapid development of electronic technology, users have more and more requirements for small-power electronic devices, resulting in more and more types of small-power electronic devices, and in small-power electronic devices, an isolated power supply circuit is often used. However, the control method causes the output voltage to be difficult to keep stable, and the output voltage is easy to fluctuate under the condition of interference, so that the normal use of the electronic equipment is influenced, even devices in the electronic equipment are damaged, and the service life of the electronic equipment is influenced.
Therefore, it is obvious that how to improve the output stability of the isolated power circuit is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The application aims to provide an isolation power supply circuit, and output stability of the isolation power supply circuit is improved. In addition, the purpose of this application still provides an electronic equipment who contains isolation power supply circuit.
In order to solve the above technical problem, the present application provides an isolated power supply circuit, which includes a PWM controller 11, a transformer 12, and a feedback circuit 13;
the primary side of the transformer 12 is connected with the power supply 10, and the secondary side of the transformer 12 is connected with the load 14;
an enable pin of the PWM controller 11 is connected to the power supply 10, a switch control pin of the PWM controller 11 is connected to the primary side, and the PWM controller 11 is configured to adjust an output signal of the switch control pin according to a relationship between an actual output voltage of the secondary side and a preset voltage so as to change an input voltage of the primary side;
the input end of the feedback circuit 13 is connected to the secondary side for obtaining the actual output voltage, and the output end of the feedback circuit 13 is connected to the feedback pin of the PWM controller 11.
Preferably, a rectifier diode is further included, an anode of the rectifier diode is connected to the second end of the secondary side, a cathode of the rectifier diode is used for connecting to the load 14, and a first end of the secondary side is grounded.
Preferably, the feedback circuit 13 specifically includes a first resistor, a second resistor, a third resistor, a three-terminal adjustable voltage regulator, an optocoupler, and a fourth resistor;
the first end of the first resistor is connected with the cathode of the rectifier diode, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the common end of the first resistor and the second resistor is connected with the reference end of the three-end adjustable voltage regulator, the first end of the three-end adjustable voltage regulator is connected with the first end of the third resistor, the second end of the third resistor is connected with the cathode of the rectifier diode, the second end of the three-end adjustable voltage regulator is grounded, the first end of the three-end adjustable voltage regulator is further connected with the second end of the optocoupler, the first end of the optocoupler is connected with the cathode of the rectifier diode, and the third end of the optocoupler and the common end of the fourth resistor are connected with the feedback pin of the PWM controller 11.
Preferably, the rectifier circuit further comprises a filter circuit, the filter circuit at least comprises a first capacitor, a first end of the first capacitor is connected with a first end of the secondary side, and a second end of the first capacitor is connected with a cathode of the rectifier diode.
Preferably, the capacitor further comprises a second capacitor, and the second capacitor is connected with the first capacitor in parallel.
Preferably, the device further comprises a peripheral compensation circuit, wherein the peripheral compensation circuit at least comprises a third capacitor;
and the first end of the third capacitor is connected with the common end of the first resistor and the second resistor, and the second end of the third capacitor is connected with the first end of the three-end adjustable voltage regulator.
Preferably, the peripheral compensation circuit further includes a fifth resistor and a fourth capacitor, and the fifth resistor and the fourth capacitor are connected in series and then connected in parallel with the third capacitor.
Preferably, the circuit further comprises an absorption circuit, wherein the absorption circuit specifically comprises a sixth resistor, a seventh resistor, a fifth capacitor and a first switching tube;
the first end of the fifth capacitor is connected with the first end of the primary side, the second end of the fifth capacitor is connected with the second end of the first switching tube, the first end of the first switching tube is connected with a switch control pin of the PWM controller 11, the sixth resistor is connected in parallel with the fifth capacitor, and the seventh resistor is connected in parallel with the sixth resistor.
Preferably, the optical coupler further comprises an eighth resistor and a ninth resistor, wherein the eighth resistor is connected with the first end of the optical coupler, and the ninth resistor is connected with the fourth end of the optical coupler.
Preferably, the three-terminal adjustable voltage regulator further comprises a sixth capacitor, a first terminal of the sixth capacitor is connected with a first terminal of the three-terminal adjustable voltage regulator, and a second terminal of the sixth capacitor is grounded.
In order to solve the above technical problem, the present application further provides an electronic device including the isolated power supply circuit.
The utility model provides an isolation power supply circuit, including PWM controller, transformer and feedback circuit, feedback circuit's input is connected with the secondary of transformer, feedback circuit's output is connected with PWM controller's feedback pin, feedback circuit acquires gives PWM controller behind the actual output voltage of secondary, PWM controller adjusts the output signal of switch control pin so that change the input voltage on primary side according to the relation between actual output voltage and the ideal voltage, and then adjusts actual output voltage. By applying the technical scheme, the actual output voltage can be kept in a stable state, and the anti-interference performance of the isolation power supply is enhanced.
In addition, the electronic equipment provided by the application comprises the isolation power supply circuit, and the effect is the same as that of the isolation power supply circuit.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of an isolated power supply circuit according to an embodiment of the present disclosure;
FIG. 2 is a circuit diagram of an isolated power supply according to an embodiment of the present disclosure;
the reference numbers are as follows:
the power supply is 10, the PWM controller is 11, the transformer is 12, the feedback circuit is 13, and the load is 14.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide the isolation power supply circuit and the electronic equipment, so that the actual output voltage can be kept in a stable state, and the anti-interference performance of the isolation power supply is enhanced.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an isolated power supply circuit according to an embodiment of the present disclosure, and a description is provided below of a structure of the isolated power supply circuit shown in fig. 1.
The isolation power supply circuit provided by the embodiment of the application comprises a PWM controller 11, a transformer 12 and a feedback circuit 13;
the primary side of the transformer 12 is used for being connected with the power supply 10, and the secondary side of the transformer 12 is used for being connected with the load 14;
an enabling pin of the PWM controller 11 is connected with the power supply 10, a switch control pin of the PWM controller 11 is connected with the primary side, and the PWM controller 11 is used for adjusting an output signal of the switch control pin according to a relation between an actual output voltage of the secondary side and a preset voltage so as to change an input voltage of the primary side;
the input end of the feedback circuit 13 is connected to the secondary side for obtaining the actual output voltage, and the output end of the feedback circuit 13 is connected to the feedback pin of the PWM controller 11.
In a specific implementation, the primary side of the transformer 12 is used for being connected to the power supply 10 to obtain an input voltage from the power supply 10, the input end of the feedback circuit 13 is connected to the secondary side of the transformer 12, the transformer 12 outputs an actual output voltage to the feedback circuit 13, the feedback circuit 13 outputs a corresponding output voltage to the PWM controller 11 according to the internal structure of the feedback circuit, and the PWM controller 11 adjusts an output signal of the switch control pin according to a relation between the actual output voltage and an ideal voltage to change the input voltage of the primary side, thereby adjusting the actual output voltage.
It should be noted that the actual output voltage UoAnd an input voltage UiThe relationship between them is:
N1is the number of turns of the primary winding of the transformer 12, N2The number of turns of the secondary winding of the transformer 12,
the duty cycle of the output signal at the switch control pin of the PWM controller 11.
When the actual output voltage U isoWhen the voltage is greater than the ideal voltage, the duty ratio of the output signal of the switch control pin of the PWM controller 11 is reduced, so that the actual output voltage is reduced; when the actual output voltage U isoWhen the voltage is smaller than the ideal voltage, the duty ratio of the output signal of the switch control pin of the PWM controller 11 is increased, so that the actual output voltage is increased, and finally the actual output voltage is kept in a stable state.
The utility model provides an isolation power supply circuit, including PWM controller, transformer and feedback circuit, feedback circuit's input is connected with the secondary of transformer, feedback circuit's output is connected with PWM controller's feedback pin, feedback circuit acquires gives PWM controller behind the actual output voltage of secondary, PWM controller adjusts the output signal of switch control pin so that change the input voltage on primary side according to the relation between actual output voltage and the ideal voltage, and then adjusts actual output voltage. By applying the technical scheme, the actual output voltage can be kept in a stable state, and the anti-interference performance of the isolation power supply is enhanced.
In addition, the transformer provided by the present application is a high-frequency transformer, because the purpose of the embodiments of the present application is to realize the step-up and step-down of the direct current. Fig. 2 is a diagram of an isolated power supply circuit according to an embodiment of the present application, and in a specific implementation, as shown in fig. 2, the isolated power supply circuit further includes a rectifier diode, an anode of the rectifier diode is connected to the second end of the secondary side, a cathode of the rectifier diode is used for being connected to the load 14, and a first end of the secondary side is connected to ground.
The isolation power supply circuit provided by the application further comprises a filter circuit, wherein the filter circuit at least comprises a first capacitor C1, the first end of a first capacitor C1 is connected with the first end of the secondary side, and the second end of the first capacitor C1 is connected with the cathode of the rectifier diode.
Preferably, a second capacitor C2 is further included, and the second capacitor C2 is connected in parallel with the first capacitor C1.
In a specific implementation, since the secondary side of the transformer 12 outputs ac power, when the load 14 needs dc power to supply power, a rectifier diode and a filter circuit are connected to the secondary side of the transformer 12, an anode of the rectifier diode is connected to the second terminal B2 of the secondary side, and second terminals of the first capacitor C1 and the second capacitor C2 of the filter circuit are connected to a cathode of the rectifier diode.
The isolation power supply circuit provided by the application comprises a rectifier diode and a filter circuit. The rectifier diode can convert alternating current output by the secondary side into pulsating direct current, and the filter capacitor can convert the pulsating direct current into smoother direct current, so that the isolation power supply circuit can output direct current required by a load.
As shown in fig. 2, the feedback circuit provided in the embodiment of the present application specifically includes a first resistor R1, a second resistor R2, a third resistor R3, a three-terminal adjustable voltage regulator U1, an optical coupler U2, and a fourth resistor R4;
the first end of the first resistor R1 is connected with the cathode of the rectifier diode, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is grounded, the common end of the first resistor R1 and the second resistor R2 is connected with the reference end 3 of the three-terminal adjustable voltage-stabilizing source U1, the first end 1 of the three-terminal adjustable voltage-stabilizing source U1 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is connected with the cathode of the rectifier diode, the second end 2 of the three-terminal adjustable voltage-stabilizing source U1 is grounded, the first end 1 of the three-terminal adjustable voltage-stabilizing source U1 is further connected with the second end 5 of the optocoupler U2, the first end 4 of the optocoupler U2 is connected with the cathode of the rectifier diode, and the common end of the third end 6 of the optocoupler U2 and the common end of the fourth resistor R4 is connected with the feedback pin of the PWM controller 11.
The isolation power supply circuit that this application embodiment provided still includes eighth resistance R8 and ninth resistance R9, and eighth resistance R8 is connected with the first end 4 of opto-coupler U2, and ninth resistance R9 is connected with the fourth end 7 of opto-coupler U2. In addition, the three-terminal adjustable voltage regulator further comprises a sixth capacitor C6, wherein a first terminal of the sixth capacitor C6 is connected with the first terminal 1 of the three-terminal adjustable voltage regulator U1, and a second terminal of the sixth capacitor C6 is grounded.
It should be noted that the embodiment of the present application does not limit the type of the three-terminal adjustable voltage regulator U1, and any chip capable of implementing the related function of the present application may be used according to practical situations, the chip adopting the TL431 type in the embodiment of the present application is only a preferred embodiment, and the following description will be given by taking TL431 as the three-terminal adjustable voltage regulator U1 as an example
In specific implementation, an ideal voltage is set to be 5V, the first resistor R1 and the second resistor R2 are connected in series and have the same resistance value, the common end of the first resistor R1 and the second resistor R2 is connected with the reference end 3 of the TL431, namely, the actual output voltage is divided by the first resistor R1 and the second resistor R2 and then enters the reference end 3 of the TL431, a 2.5V reference source is arranged inside the TL431 chip, and the voltage of the reference end 3 is compared with the internal reference source, so that the current flowing between the first end 1 and the second end 2 is controlled, and the current flowing through the optocoupler U2 is further controlled. The current that flows between the first end 4 of opto-coupler U2 and the second end 5 can control the current that flows between opto-coupler third end 6 and the fourth end 7, and the voltage drop that produces on fourth resistance R4 gets into the feedback pin of PWM controller 11, through the duty cycle of the inside regulation control switch control pin output of PWM controller 11 to realize output voltage's stability.
The utility model provides an isolation power supply circuit carries out voltage conversion through TL431 and opto-coupler that uses the high accuracy for actual output voltage can remain stable state, has strengthened the interference immunity who keeps apart the power, and in addition, the third resistance provides initial operating current for TL431, and eighth resistance and ninth resistance are current-limiting protection resistance, and the current of opto-coupler is flowed through in the restriction, avoids the electric current too big and the loss device.
As shown in fig. 2, the isolated power supply circuit provided by the present application further includes a peripheral compensation circuit, which includes at least a third capacitor C3;
the first end of the third capacitor C3 is connected with the common end of the first resistor R1 and the second resistor R2, and the second end of the third capacitor C3 is connected with the first end 1 of the three-end adjustable voltage regulator U1.
Preferably, the peripheral compensation circuit further includes a fifth resistor R5 and a fourth capacitor C4, and the fifth resistor R5 and the fourth capacitor C4 are connected in series and then connected in parallel with the third capacitor C3.
The peripheral compensation circuit provided by the application provides required feedback loop compensation around feedback circuit, and control loop that can be stable has strengthened the stability of feedback circuit loop, and then has increased actual output voltage's stability.
As shown in fig. 2, the isolated power supply circuit provided by the present application further includes an absorption circuit, which specifically includes a sixth resistor R6, a seventh resistor R7, a fifth capacitor C5, and a first switch tube D1;
the first end of the fifth capacitor C5 is connected with the first end of the primary side, the second end of the fifth capacitor C5 is connected with the second end of the first switch tube D1, the first end of the first switch tube D1 is connected with the switch control pin of the PWM controller 11, the sixth resistor R6 is connected in parallel with the fifth capacitor C5, and the seventh resistor R7 is connected in parallel with the sixth resistor R6.
The absorption circuit provided by the application absorbs the instantaneous peak voltage of the switch of the PWM controller 11, and the stability of the isolation power supply circuit is enhanced.
In addition, the present application also provides an electronic device including the isolated power supply circuit mentioned in the above embodiments.
Since the isolated power circuit is described in detail above, the present embodiment is not described in detail.
The application provides electronic equipment, including isolation power supply circuit, this circuit includes the PWM controller, transformer and feedback circuit, feedback circuit's input is connected with the secondary of transformer, feedback circuit's output is connected with the feedback pin of PWM controller, feedback circuit acquires gives the PWM controller after the actual output voltage of secondary, the output signal of PWM controller regulation switch control pin is so that change the input voltage on primary side according to the relation between actual output voltage and the ideal voltage, and then adjusts actual output voltage. By applying the technical scheme, the actual output voltage can be kept in a stable state, and the anti-interference performance of the isolation power supply is enhanced.
The isolated power supply circuit provided by the present application is described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (11)
1. An isolated power supply circuit, comprising a PWM controller (11), a transformer (12) and a feedback circuit (13);
the primary side of the transformer (12) is connected with a power supply (10), and the secondary side of the transformer (12) is connected with a load (14);
an enabling pin of the PWM controller (11) is connected with the power supply (10), a switch control pin of the PWM controller (11) is connected with the primary side, and the PWM controller (11) is used for adjusting an output signal of the switch control pin according to a relation between an actual output voltage of the secondary side and a preset voltage so as to change an input voltage of the primary side;
the input end of the feedback circuit (13) is connected with the secondary side and used for obtaining the actual output voltage, and the output end of the feedback circuit (13) is connected with a feedback pin of the PWM controller (11).
2. The isolated power supply circuit of claim 1, further comprising a rectifying diode, an anode of said rectifying diode being connected to the second end of said secondary side, a cathode of said rectifying diode being adapted for connection to said load (14), a first end of said secondary side being connected to ground.
3. The isolated power supply circuit according to claim 2, wherein the feedback circuit (13) specifically comprises a first resistor, a second resistor, a third resistor, a three-terminal adjustable voltage regulator, an optocoupler, and a fourth resistor;
the first end of the first resistor is connected with the cathode of the rectifier diode, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the common end of the first resistor and the second resistor is connected with the reference end of the three-end adjustable voltage-stabilizing source, the first end of the three-end adjustable voltage-stabilizing source is connected with the first end of the third resistor, the second end of the third resistor is connected with the cathode of the rectifier diode, the second end of the three-end adjustable voltage-stabilizing source is grounded, the first end of the three-end adjustable voltage-stabilizing source is further connected with the second end of the optocoupler, the first end of the optocoupler is connected with the cathode of the rectifier diode, and the third end of the optocoupler and the common end of the fourth resistor are connected with the feedback pin of the PWM controller (11).
4. The isolated power supply circuit of claim 3, further comprising a filter circuit comprising at least a first capacitor, a first terminal of the first capacitor connected to a first terminal of the secondary side, a second terminal of the first capacitor connected to a cathode of the rectifier diode.
5. The isolated power supply circuit of claim 4, further comprising a second capacitor connected in parallel with the first capacitor.
6. The isolated power supply circuit of claim 4 or 5, further comprising a peripheral compensation circuit, the peripheral compensation circuit comprising at least a third capacitance;
and the first end of the third capacitor is connected with the common end of the first resistor and the second resistor, and the second end of the third capacitor is connected with the first end of the three-end adjustable voltage regulator.
7. The isolated power supply circuit of claim 6, wherein the periphery compensation circuit further comprises a fifth resistor and a fourth capacitor, the fifth resistor and the fourth capacitor being connected in series and then connected in parallel with the third capacitor.
8. The isolated power supply circuit of claim 7, further comprising an absorption circuit, wherein the absorption circuit comprises a sixth resistor, a seventh resistor, a fifth capacitor and a first switch tube;
the first end of the fifth capacitor is connected with the first end of the primary side, the second end of the fifth capacitor is connected with the second end of the first switching tube, the first end of the first switching tube is connected with a switch control pin of the PWM controller (11), the sixth resistor is connected with the fifth capacitor in parallel, and the seventh resistor is connected with the sixth resistor in parallel.
9. The isolated power supply circuit of claim 3, further comprising an eighth resistor and a ninth resistor, the eighth resistor connected to the first end of the optocoupler and the ninth resistor connected to the fourth end of the optocoupler.
10. The isolated power supply circuit of claim 9, further comprising a sixth capacitor, a first terminal of the sixth capacitor being connected to the first terminal of the three-terminal adjustable voltage regulator, a second terminal of the sixth capacitor being connected to ground.
11. An electronic device comprising an isolated power supply circuit as claimed in any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011103047.2A CN114374323A (en) | 2020-10-15 | 2020-10-15 | Isolated power supply circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011103047.2A CN114374323A (en) | 2020-10-15 | 2020-10-15 | Isolated power supply circuit and electronic equipment |
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| CN114374323A true CN114374323A (en) | 2022-04-19 |
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| CN202011103047.2A Pending CN114374323A (en) | 2020-10-15 | 2020-10-15 | Isolated power supply circuit and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117439408A (en) * | 2023-10-25 | 2024-01-23 | 广东迅扬科技股份有限公司 | Stabilizing circuit and control method thereof |
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