CN110855127A - Feedback control circuit, charger and switching power supply - Google Patents
Feedback control circuit, charger and switching power supply Download PDFInfo
- Publication number
- CN110855127A CN110855127A CN201911179255.8A CN201911179255A CN110855127A CN 110855127 A CN110855127 A CN 110855127A CN 201911179255 A CN201911179255 A CN 201911179255A CN 110855127 A CN110855127 A CN 110855127A
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- resistor
- circuit
- feedback
- control circuit
- feedback control
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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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a feedback control circuit, a charger and a switching power supply, wherein the feedback control circuit comprises a primary side control circuit, a secondary side feedback circuit and a photoelectric coupler; the secondary feedback circuit feeds back the change of the output voltage of the secondary circuit to the primary control circuit through a photoelectric coupler; the photoelectric coupler comprises a light emitting device and a light receiving device; the secondary feedback circuit includes: the controllable precise voltage stabilizing chip comprises a cathode, an anode and a reference electrode; the anode is grounded, and the cathode is connected to the negative electrode of the light-emitting device; a primary feedback circuit providing a reference voltage for the reference electrode; and a secondary feedback circuit providing a reference voltage to the reference electrode. Compared with the prior art, the feedback control circuit provided by the invention is provided with the secondary feedback circuit, so that the reliability of the feedback control circuit is effectively enhanced.
Description
Technical Field
The invention relates to a feedback control circuit, a charger and a switching power supply.
Background
In designing an electrical appliance such as a charger or a switching power supply, a designer usually designs a voltage stabilizing feedback circuit by using a TL431 voltage stabilizing chip to output a voltage lower than 36V. The TL431 voltage stabilizing chip is provided with a 2.5V reference voltage, so that the use is convenient. A designer can form a stable secondary side circuit voltage feedback voltage stabilizing ring with low cost by connecting a TL431 voltage stabilizing chip, a photoelectric coupler, a peripheral resistor, a capacitor and the like, as shown in fig. 1The feedback circuit is a typical voltage stabilizing feedback circuit adopting a TL431 voltage stabilizing chip, and the output voltage stabilizing calculation formula of the typical circuit is Uout2.5V (1+ Ra/Rb). However, this solution has a major disadvantage that when there is a problem in the material of the resistor Ra or the resistor Rb itself, or the resistor Ra or the resistor Rb is short-circuited or short-soldered due to the manufacturing process, the reference voltage 2.5V of the reference electrode of the TL431 regulator chip fails or the correct voltage value cannot be acquired, and at this time, the voltage output from the output terminal of the switching power supply, the charger, etc. is out of control, or even the output voltage exceeds the designed expected value. When such a defective switching power supply or charger is introduced into the hands of the end consumer, the circuit may fail or malfunction, which may have serious consequences.
In view of the above problems, it is desirable to provide a feedback control circuit to solve the above problems.
Disclosure of Invention
The invention aims to provide a feedback control circuit, a charger and a switching power supply, wherein the feedback control circuit is provided with a secondary feedback circuit, so that the reliability of the feedback control circuit is effectively enhanced, and the problems of overcurrent explosion of a switching tube of a primary side circuit and out-of-control of output voltage of a secondary side circuit under the condition that a single-voltage-loop of the charger and the switching power supply fails are solved.
In order to achieve the above object, the present invention provides a feedback control circuit, which comprises a primary side control circuit, a secondary side feedback circuit and a photoelectric coupler; the secondary feedback circuit feeds back the change of the output voltage of the secondary circuit to the primary control circuit through a photoelectric coupler; the photoelectric coupler comprises a light emitting device and a light receiving device; the secondary feedback circuit includes: the controllable precise voltage stabilizing chip comprises a cathode, an anode and a reference electrode; the anode is grounded, and the cathode is connected to the negative electrode of the light-emitting device; a primary feedback circuit providing a reference voltage for the reference electrode; and a secondary feedback circuit providing a reference voltage to the reference electrode.
As a further improvement of the present invention, the primary feedback circuit includes a first resistor and a second resistor; one end of the first resistor is grounded, and the other end of the first resistor is connected to one end of the second resistor; the other end of the second resistor is connected to the output end of the secondary side circuit; the reference pole is connected between the first resistor and the second resistor.
As a further improvement of the present invention, the secondary feedback circuit includes a third resistor and a voltage regulator tube; one end of the third resistor is connected to the reference electrode, and the other end of the third resistor is connected to the anode of the voltage stabilizing tube; and the cathode of the voltage stabilizing tube is connected to the output end of the secondary side circuit.
As a further improvement of the present invention, the secondary feedback circuit further includes a fourth resistor; one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected to the anode of the voltage stabilizing tube.
As a further improvement of the present invention, the primary feedback circuit includes a first resistor and a second resistor; one end of the first resistor is grounded, and the other end of the first resistor is connected to one end of the second resistor; the other end of the second resistor is connected to the output end of the secondary side circuit; the reference pole is connected between the first resistor and the second resistor; the secondary feedback circuit further comprises a diode; and the cathode of the diode is connected between the first resistor and the second resistor, and the other end of the diode is connected to the third resistor.
As a further improvement of the present invention, the secondary feedback circuit further includes a current limiting resistor; one end of the current-limiting resistor is connected to the anode of the light-emitting device, and the other end of the current-limiting resistor is connected to the output end of the secondary side circuit.
As a further improvement of the present invention, the secondary feedback circuit further includes a capacitor and a fifth resistor; one end of the capacitor is connected to the negative electrode of the light-emitting device, and the other end of the capacitor is connected to one end of the fifth resistor; the other end of the fifth resistor is connected between the first resistor and the second resistor.
As a further improvement of the invention, the controllable precise voltage stabilization chip is a TL431 voltage stabilization chip.
The invention also discloses a charger which comprises a primary side circuit, a secondary side circuit and the feedback control circuit.
The invention also discloses a switching power supply which comprises a primary side circuit, a secondary side circuit and the feedback control circuit.
The invention has the beneficial effects that: the feedback control circuit is provided with the secondary feedback circuit, so that the reliability of the feedback control circuit is effectively enhanced, and the problems of overcurrent explosion of a switching tube of a primary side circuit and out-of-control of output voltage of a secondary side circuit under the condition that a single-voltage ring of a charger and a switching power supply fails are solved.
Drawings
Fig. 1 is a schematic diagram of a conventional feedback control circuit.
Fig. 2 is a schematic diagram of a first embodiment of the feedback control circuit of the present invention.
Fig. 3 is a schematic diagram of a second embodiment of the feedback control circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or intervening components may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 2, the present invention discloses a feedback control circuit 100, which includes a primary side control circuit 10, a secondary side feedback circuit 20, and a photo coupler 30. The secondary feedback circuit 20 feeds back the change of the output voltage of the secondary circuit 40 to the primary control circuit 10 through the photoelectric coupler 30, so that the primary control circuit 10 controls the primary circuit 50 to work according to the received feedback signal, thereby achieving the purpose of voltage stabilization. The photo-coupler 30 includes a light emitting device 31 and a light receiving device 32 fitted to the light emitting device 31. The light receiving device 32 is connected to the primary side control circuit 10, so that the primary side control circuit 10 receives a feedback signal.
The secondary feedback circuit 20 includes a controllable precision voltage stabilization chip 21, a primary feedback circuit 22, and a secondary feedback circuit 23. The controllable precise voltage stabilization chip 21 includes a cathode, an anode and a reference electrode, the anode is grounded, and the cathode is connected to the cathode of the light emitting device 31. In this embodiment, the controllable precise voltage regulation chip 21 is a TL431 chip. The primary feedback circuit 22 provides a reference voltage for the reference pole, and includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is grounded, and the other end is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the output end of the secondary side circuit 40. The reference pole is connected between the first resistor R1 and the second resistor R2. The secondary feedback circuit 23 is used to provide a reference voltage for the reference pole. Due to the arrangement of the secondary feedback circuit 23, the feedback control circuit 100 can still normally work when the primary feedback circuit 22 fails, so that the reliability of the feedback control circuit 100 is effectively enhanced, and the problems of overcurrent explosion of a switching tube of the primary side circuit 50 and the problem of out-of-control output voltage of the secondary side circuit under the condition of failure of a single-rectifier voltage loop are solved. The secondary feedback circuit 23 includes a third resistor R3, a fourth resistor R4, and a zener diode ZD 1. One end of the third resistor R3 is connected to the connection position of the reference pole and the first resistor R1 and the second resistor R2, and the other end is connected to the anode of the voltage regulator tube ZD 1. The cathode of the voltage regulator tube ZD1 is connected to the output end of the secondary side circuit 40. One end of the fourth resistor R4 is grounded, and the other end is connected to the anode of the zener diode ZD 1. When the primary feedback circuit 22 fails, the output voltage of the secondary side circuit 40 will gradually increase. When the output voltage of the secondary side circuit 40 exceeds the voltage stabilizing value of the voltage stabilizing tube ZD1, the voltage stabilizing tube ZD1 is broken down, so that the reference electrode obtains the reference voltage from the secondary feedback circuit 23, and the controllable precise voltage stabilizing chip 21 can normally work again, thereby achieving the purpose of secondary voltage stabilization, and effectively solving the problem that the output voltage of the secondary side circuit 40 is out of control or overvoltage after the primary feedback circuit 22 fails. The fourth resistor R4 is used to fine-tune the output voltage of the secondary side circuit 40, and can make the non-intervenient secondary feedback circuit 23 not affect the operation stability of the primary feedback circuit 22.
Preferably, the secondary feedback circuit 20 further includes a capacitor C1, a fifth resistor R5, and a current limiting resistor R6. One end of the capacitor C1 is connected to the cathode of the light emitting device 31, and the other end is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected between the first resistor R1 and the second resistor R2. One end of the current limiting resistor R6 is connected to the anode of the light emitting device 31, and the other end is connected to the output end of the secondary side circuit 40, so as to limit the maximum current flowing through the photocoupler 30 and the controllable precise voltage stabilizing chip 21.
Fig. 3 shows a feedback control circuit 200 according to a second embodiment of the present invention. The structure of the feedback control circuit 200 is substantially the same as the structure of the feedback control circuit 100, except that the secondary feedback circuit 24 of the feedback control circuit 200 further includes a diode D1. The cathode of the diode D1 is connected between the first resistor R1 and the second resistor R2, and the anode of the diode D1 is connected to the third resistor R3. By such an arrangement, when the primary feedback circuit 22 operates normally, the diode D1 can cut off the reference electrode of the controlled precision voltage regulation chip 21 and prevent the reference electrode from being divided by the third resistor R3 and the fourth resistor R4, so that parameter setting can be simplified. If the diode D1 is not provided, the matching of the whole network resistances of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 needs to be considered globally, so that the parameter adjustment is cumbersome.
The invention also discloses a charger, which comprises a primary side circuit, a secondary side circuit and the feedback control circuit 100 or 200.
The invention also discloses a switching power supply, which comprises a primary side circuit, a secondary side circuit and the feedback control circuit 100 or 200.
Compared with the prior art, the feedback control circuits 100 and 200 are provided with the secondary feedback circuits 23 and 24, so that the reliability of the feedback control circuits 100 and 200 is effectively enhanced, and the problems of overcurrent explosion of a switching tube of a primary side circuit and runaway of output voltage of a secondary side circuit under the condition that a single voltage loop of a charger and a switching power supply fails are solved.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. A feedback control circuit comprises a primary side control circuit, a secondary side feedback circuit and a photoelectric coupler; the secondary feedback circuit feeds back the change of the output voltage of the secondary circuit to the primary control circuit through a photoelectric coupler; the photoelectric coupler comprises a light emitting device and a light receiving device; wherein the secondary feedback circuit comprises:
the controllable precise voltage stabilizing chip comprises a cathode, an anode and a reference electrode; the anode is grounded, and the cathode is connected to the negative electrode of the light-emitting device;
a primary feedback circuit providing a reference voltage for the reference electrode; and
a secondary feedback circuit to provide a reference voltage to the reference electrode.
2. The feedback control circuit of claim 1, wherein: the primary feedback circuit comprises a first resistor and a second resistor; one end of the first resistor is grounded, and the other end of the first resistor is connected to one end of the second resistor; the other end of the second resistor is connected to the output end of the secondary side circuit; the reference pole is connected between the first resistor and the second resistor.
3. The feedback control circuit of claim 1, wherein: the secondary feedback circuit comprises a third resistor and a voltage regulator tube; one end of the third resistor is connected to the reference electrode, and the other end of the third resistor is connected to the anode of the voltage stabilizing tube; and the cathode of the voltage stabilizing tube is connected to the output end of the secondary side circuit.
4. The feedback control circuit of claim 3, wherein: the secondary feedback circuit further comprises a fourth resistor; one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected to the anode of the voltage stabilizing tube.
5. The feedback control circuit of claim 4, wherein: the primary feedback circuit comprises a first resistor and a second resistor; one end of the first resistor is grounded, and the other end of the first resistor is connected to one end of the second resistor; the other end of the second resistor is connected to the output end of the secondary side circuit; the reference pole is connected between the first resistor and the second resistor; the secondary feedback circuit further comprises a diode; and the cathode of the diode is connected between the first resistor and the second resistor, and the other end of the diode is connected to the third resistor.
6. The feedback control circuit of claim 1, wherein: the secondary side feedback circuit also comprises a current limiting resistor; one end of the current-limiting resistor is connected to the anode of the light-emitting device, and the other end of the current-limiting resistor is connected to the output end of the secondary side circuit.
7. The feedback control circuit of claim 2, wherein: the secondary side feedback circuit further comprises a capacitor and a fifth resistor; one end of the capacitor is connected to the negative electrode of the light-emitting device, and the other end of the capacitor is connected to one end of the fifth resistor; the other end of the fifth resistor is connected between the first resistor and the second resistor.
8. The feedback control circuit of claim 1, wherein: the controllable precise voltage stabilization chip is a TL431 voltage stabilization chip.
9. A charger comprising a primary circuit, a secondary circuit, and a feedback control circuit as claimed in any one of claims 1 to 8.
10. A switching power supply comprising a primary side circuit, a secondary side circuit, and a feedback control circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911179255.8A CN110855127A (en) | 2019-11-27 | 2019-11-27 | Feedback control circuit, charger and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911179255.8A CN110855127A (en) | 2019-11-27 | 2019-11-27 | Feedback control circuit, charger and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110855127A true CN110855127A (en) | 2020-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911179255.8A Pending CN110855127A (en) | 2019-11-27 | 2019-11-27 | Feedback control circuit, charger and switching power supply |
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| Country | Link |
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| CN (1) | CN110855127A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783430A (en) * | 2020-06-10 | 2021-12-10 | 苏州明纬科技有限公司 | Limit power control circuit and power supply device with limit power control circuit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002136117A (en) * | 2000-10-20 | 2002-05-10 | Kaga Component Kk | Switching power device |
| US20070201252A1 (en) * | 2006-02-24 | 2007-08-30 | Ta-Yung Yang | Control circuit having two-level under voltage lockout threshold to improve the protection of power supply |
| CN104038038A (en) * | 2014-06-03 | 2014-09-10 | 青岛海信电器股份有限公司 | Startup circuit and electronic equipment |
| CN205231714U (en) * | 2015-11-27 | 2016-05-11 | 深圳Tcl新技术有限公司 | Switching power supply protection circuit and switching power supply |
| CN106849641A (en) * | 2017-03-20 | 2017-06-13 | 常州格力博有限公司 | A kind of mu balanced circuit |
| CN206542331U (en) * | 2017-03-21 | 2017-10-03 | 中国矿业大学 | A kind of auto-excitation type anti exciting converter |
| CN207117173U (en) * | 2017-08-18 | 2018-03-16 | 广州视源电子科技股份有限公司 | A kind of overvoltage crowbar and switching power circuit |
| CN209571950U (en) * | 2018-12-24 | 2019-11-01 | 深圳市思科锐实业有限公司 | Intelligent high pressure pulse DC power supply |
-
2019
- 2019-11-27 CN CN201911179255.8A patent/CN110855127A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002136117A (en) * | 2000-10-20 | 2002-05-10 | Kaga Component Kk | Switching power device |
| US20070201252A1 (en) * | 2006-02-24 | 2007-08-30 | Ta-Yung Yang | Control circuit having two-level under voltage lockout threshold to improve the protection of power supply |
| CN104038038A (en) * | 2014-06-03 | 2014-09-10 | 青岛海信电器股份有限公司 | Startup circuit and electronic equipment |
| CN205231714U (en) * | 2015-11-27 | 2016-05-11 | 深圳Tcl新技术有限公司 | Switching power supply protection circuit and switching power supply |
| CN106849641A (en) * | 2017-03-20 | 2017-06-13 | 常州格力博有限公司 | A kind of mu balanced circuit |
| CN206542331U (en) * | 2017-03-21 | 2017-10-03 | 中国矿业大学 | A kind of auto-excitation type anti exciting converter |
| CN207117173U (en) * | 2017-08-18 | 2018-03-16 | 广州视源电子科技股份有限公司 | A kind of overvoltage crowbar and switching power circuit |
| CN209571950U (en) * | 2018-12-24 | 2019-11-01 | 深圳市思科锐实业有限公司 | Intelligent high pressure pulse DC power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783430A (en) * | 2020-06-10 | 2021-12-10 | 苏州明纬科技有限公司 | Limit power control circuit and power supply device with limit power control circuit |
| CN113783430B (en) * | 2020-06-10 | 2024-05-24 | 苏州明纬科技有限公司 | Power limiting control circuit and power supply device with same |
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Address after: No.65-1 Xinggang Road, Zhonglou Economic Development Zone, Changzhou City, Jiangsu Province Applicant after: Gelibo (Jiangsu) Co.,Ltd. Address before: No.65 Xinggang Road, Zhonglou Economic Development Zone, Changzhou City, Jiangsu Province Applicant before: CHANGZHOU GLOBE Co.,Ltd. |
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Application publication date: 20200228 |
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