CN219496509U - Flyback transformer input voltage detection circuit structure and electrical equipment - Google Patents
Flyback transformer input voltage detection circuit structure and electrical equipment Download PDFInfo
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- CN219496509U CN219496509U CN202320730044.4U CN202320730044U CN219496509U CN 219496509 U CN219496509 U CN 219496509U CN 202320730044 U CN202320730044 U CN 202320730044U CN 219496509 U CN219496509 U CN 219496509U
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- 239000003381 stabilizer Substances 0.000 claims description 7
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model is suitable for the technical field of electronic circuits, and particularly provides a flyback transformer input voltage detection circuit structure and electrical equipment, wherein the structure comprises an input voltage stress module, a feedback circuit and a feedback circuit, wherein the input voltage stress module is arranged on the secondary side of the flyback transformer and is used for generating stress voltage along with the change of the input voltage of the flyback transformer; the voltage detection module is connected with the input voltage stress module and used for detecting the stress voltage so as to output a detection voltage signal to the rear-end controller. The input voltage stress module is arranged on the secondary side of the flyback transformer, the input voltage stress module can generate stress voltage along with the change of the input voltage of the flyback transformer, and then the voltage detection module detects the stress voltage to output a detection voltage signal to the rear-end controller, so that the function of detecting the input voltage of the flyback transformer is realized, the circuit structure is simplified, and the circuit layout difficulty is reduced.
Description
Technical Field
The utility model belongs to the technical field of electronic circuits, and particularly relates to a flyback transformer input voltage detection circuit structure and electrical equipment.
Background
Flyback transformers are converters that are suitable for low-power supplies and for various power adapters. The output end of the transformer gets energy when the primary winding is disconnected from the power supply, so the transformer is named. The flyback converter has simple circuit structure and low cost and is deeply favored by development engineers.
In the use process, the power input voltage needs to be detected for input undervoltage or input overvoltage protection. In the existing detection mode, a detection circuit and an MCU are added on the primary side of a flyback transformer to detect input voltage, a special detection chip is needed to be used for detecting the input voltage, and in addition, the primary side of the flyback transformer is connected with a power supply such as mains supply and the like, so that the layout difficulty and the structural complexity of the detection circuit are high.
Disclosure of Invention
The utility model provides a flyback transformer input voltage detection circuit structure, which solves the problems that a special detection chip is needed for detecting the input voltage of the existing flyback transformer and the layout difficulty and the structure complexity of a detection circuit are high.
The utility model is realized in such a way that a flyback transformer input voltage detection circuit structure comprises:
the input voltage stress module is arranged at the secondary of the flyback transformer and is used for generating stress voltage along with the change of the input voltage of the flyback transformer;
the voltage detection module is connected with the input voltage stress module and used for detecting the stress voltage so as to output a detection voltage signal to the rear-end controller.
Optionally, the input voltage stress module comprises a voltage detection winding;
one end of the voltage detection winding is connected with the input cathode of the voltage detection circuit, and the other end of the voltage detection winding is connected with the input anode of the voltage detection circuit.
Optionally, the voltage detection module includes a first diode, a first resistor, a second resistor, a third resistor, and a first capacitor;
the anode of the first diode is connected with the other end of the voltage detection winding, and the cathode of the first diode is grounded through a first resistor, a second resistor and a third resistor which are sequentially connected in series;
the circuit between the first resistor and the second resistor is grounded through a first capacitor;
the line between the second resistor and the third resistor is connected with an AD port of the rear end controller;
and one end of the third resistor, which is grounded, is connected with one end of the voltage detection winding.
Optionally, the voltage detection module further includes a zener diode and a second capacitor;
one end of the cathode of the voltage stabilizing diode and one end of the second capacitor are connected with an AD port of the back-end controller;
the anode of the zener diode and the other end of the second capacitor are grounded.
Optionally, the flyback transformer input voltage detection circuit structure further includes:
a rectifying input module connected with the main winding of the flyback transformer;
the power supply control module is connected with the auxiliary winding of the flyback transformer and the rectification input module;
an output rectifying circuit module connected with the output winding of the flyback transformer; and
and the negative feedback module is connected with the power supply control module and the output rectifying circuit module.
Optionally, the power control module includes a power chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a sixth capacitor, a seventh capacitor, a sixth diode, and a seventh diode;
the power chip is characterized in that a D pin of the power chip is connected with the anode of the sixth diode and one end of the main winding, a VDD pin of the power chip is connected with one end of the sixth resistor, one end of the seventh resistor and one end of the sixth capacitor, a BIO pin of the power chip is connected with one end of the eighth resistor and one end of the ninth resistor, a CS pin of the power chip is connected with one end of the tenth resistor, and a GND pin of the power chip is grounded;
the cathode of the sixth diode is connected with one end of the eleventh resistor and one end of the seventh capacitor;
the other end of the sixth resistor, the other end of the eleventh resistor and the other end of the seventh capacitor are connected with the other end of the main winding;
the other end of the seventh resistor is connected with the cathode of the seventh diode;
the other end of the eighth resistor and the anode of the seventh diode are connected with one end of the auxiliary winding, and the other end of the auxiliary winding is grounded;
the other end of the sixth capacitor, the other end of the ninth resistor and the other end of the tenth resistor are grounded.
Optionally, the output rectifying circuit module includes a twelfth resistor, an eighth diode, an eighth capacitor, a ninth capacitor, a tenth capacitor, and a third common-mode inductor;
the anode of the eighth diode is connected with one end of the output winding, and the cathode of the eighth diode is connected with one end of the eighth capacitor and the third pin of the third common-mode inductor;
the other ends of the first pin and the eighth capacitor of the third common mode inductor are connected with the other end of the output winding;
the second pin of the third common mode inductor is connected with one end of the ninth capacitor;
the other ends of the fourth pin of the third common mode inductor and the ninth capacitor are grounded;
the twelfth resistor and the tenth capacitor are connected in series and then connected in parallel with the eighth diode.
Optionally, the negative feedback module comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eleventh capacitor, a twelfth capacitor, an adjustable voltage regulator and an optocoupler;
the input end of the optocoupler is connected with one end of a thirteenth resistor and one end of a fourteenth resistor, the input two ends of the optocoupler are connected with the other end of the thirteenth resistor, one end of an eleventh capacitor and the cathode of the adjustable voltage stabilizer, the output end of the optocoupler is connected with one end of a twelfth capacitor, and the output two ends of the optocoupler are connected with the other end of the twelfth capacitor and the power supply control module;
the other end of the eleventh capacitor is connected with one end of the fifteenth resistor;
the other end of the fifteenth resistor is connected with one end of the sixteenth resistor, one end of the seventeenth resistor and the reference end of the adjustable voltage stabilizer;
the other end of the fourteenth resistor and the other end of the sixteenth resistor are connected with the output rectifying circuit module;
the anode of the adjustable voltage regulator, the other end of the seventeenth resistor and one end of the twelfth capacitor are grounded.
In a second aspect, the present application further provides an electrical device, including a flyback transformer input voltage detection circuit structure as described above.
The utility model has the beneficial effects that the input voltage stress module is arranged at the secondary side of the flyback transformer, the input voltage stress module can generate stress voltage along with the change of the input voltage of the flyback transformer, and then the voltage detection module detects the stress voltage to output a detection voltage signal to the back-end controller, so that the function of detecting the input voltage of the flyback transformer is realized, the back-end controller does not need to use a special detection chip, the circuit structure is simplified, and the circuit layout difficulty is reduced.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of an input voltage detection circuit configuration of a flyback transformer of the present application;
FIG. 2 is a schematic block diagram of another embodiment of an input voltage detection circuit structure of the flyback transformer of the present application;
fig. 3 is a schematic circuit diagram of an embodiment of an input voltage detection circuit structure of the flyback transformer of the present application.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
According to the embodiment of the utility model, the input voltage stress module is arranged at the secondary side of the flyback transformer, the input voltage stress module can generate stress voltage along with the change of the input voltage of the flyback transformer, and then the voltage detection module detects the stress voltage to output a detection voltage signal to the rear-end controller, so that the function of detecting the input voltage of the flyback transformer is realized, the rear-end controller does not need to use a special detection chip, the circuit structure is simplified, and the circuit layout difficulty is reduced.
Example 1
As shown in fig. 1 to 3, the present embodiment provides a flyback transformer input voltage detection circuit structure, including:
the input voltage stress module 100 is disposed at the secondary of the flyback transformer T1, and is configured to generate a stress voltage according to the input voltage variation of the flyback transformer T1;
the voltage detection module 200 is connected to the input voltage stress module 100, and is configured to detect a stress voltage to output a detection voltage signal to the back-end controller U1.
In practice, flyback transformer T1 comprises a primary for connecting the input and the control section and a secondary for connecting the output. Optionally, the primary side of the conventional flyback transformer T1 includes a main winding and an auxiliary winding, and the primary side of the flyback transformer T1 includes an output winding, which is not described herein.
Optionally, the present application provides an input voltage stress module 100 at the secondary side of the flyback transformer T1, and the input voltage stress module 100 may generate a stress voltage according to the input voltage of the flyback transformer T1.
Alternatively, the input voltage stress module 100 may employ a voltage detection winding, one end of which is connected to the input negative electrode of the voltage detection module 200, and the other end of which is connected to the input positive electrode of the voltage detection module 200.
In implementation, by adding a voltage detection winding to the secondary side of the flyback transformer T1, the voltage detection winding generates a stress voltage when the input voltage of the primary side of the flyback transformer T1 changes, and is further detected by the voltage detection module 200, so that the voltage detection module 200 generates a detection voltage signal and outputs the detection voltage signal to the back-end controller U1.
Optionally, the back-end controller U1 may use a single-chip microcomputer chip, and the back-end controller U1 calculates an input voltage according to the detected voltage signal, so as to implement an input voltage detection function.
In the embodiment of the utility model, the input voltage stress module 100 is arranged at the secondary side of the flyback transformer T1, the input voltage stress module 10 can generate stress voltage along with the change of the input voltage of the flyback transformer T1, and then the voltage detection module 200 detects the stress voltage to output a detection voltage signal to the back-end controller U1, so that the function of detecting the input voltage of the flyback transformer T1 is realized, the back-end controller U1 does not need to use a special detection chip, the hardware cost can be effectively controlled, the circuit structure is simplified, and the circuit layout difficulty is reduced.
Example two
In some alternative embodiments, the voltage detection module 200 includes a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1;
the anode of the first diode D1 is connected with the other end of the voltage detection winding, and the cathode of the first diode D1 is grounded through a first resistor R1, a second resistor R2 and a third resistor R3 which are sequentially connected in series;
the circuit between the first resistor R1 and the second resistor R2 is grounded through a first capacitor C1;
the line between the second resistor R2 and the third resistor R3 is connected with the AD port of the back-end controller U1;
and one end of the third resistor R3, which is grounded, is connected with one end of the voltage detection winding.
In implementation, the second resistor R2 and the third resistor R3 divide the voltage of the voltage detection winding and then output the divided voltage to the rear end controller U1, so that the circuit structure is simple and reliable.
Optionally, the voltage detection module 200 further includes a zener diode ZD1 and a second capacitor C2;
one end of the cathode of the zener diode ZD1 and one end of the second capacitor C2 are connected with an AD port of the back-end controller U1;
the anode of the zener diode ZD1 and the other end of the second capacitor C2 are grounded.
Optionally, the zener diode ZD1 and the second capacitor C2 may stabilize and filter the electrical signal output from the voltage detection module 200 to the AD port of the back-end controller U1, thereby improving signal stability and reliability of detecting the input voltage.
Example III
Optionally, the flyback transformer input voltage detection circuit structure provided in the present application further includes:
a rectifying input module 300 connected to the main winding of flyback transformer T1;
a power control module 400 connected to the auxiliary winding of flyback transformer T1 and to rectifying input module 300;
an output rectifying circuit module 500 connected to the output winding of the flyback transformer T1; and
and a negative feedback module 600 connected to the power control module 400 and the output rectifying circuit module 500.
Optionally, the rectifying input module 300 includes a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a varistor VDR1, a third capacitor C3, and a fourth capacitor C4;
the cathode of the second diode D2 is connected with the cathode of the third diode D3, one end of the third capacitor C3 and the other end of the main winding;
the anode of the second diode D2 is connected with the cathode of the fifth diode D5, one end of the fourth capacitor C4, one end of the piezoresistor VDR1 and one end of the power supply output;
the anode of the third diode D3 is connected with the cathode of the fourth diode D4, the other end of the fourth capacitor C4, the other end of the piezoresistor VDR1 and two ends of the power supply output;
the anode of the fourth diode D4 is connected with the anode of the fifth diode D5 and the other end of the third capacitor C3;
the other end of the third capacitor C3 is grounded.
In practice, the power output end and the power output two ends are used for connecting to a power supply, and in some embodiments, the power supply may be a mains supply or other power supply, which is not limited herein.
In some possible embodiments, the power output end and the power output two ends may be integrated in the connection terminal CN1, specifically, the connection terminal CN1 includes a pin 1, a pin 2, and a pin 3, where the pin 1 may be regarded as the power output end, the pin 3 may be regarded as the power output two ends, and the pin 2 may be regarded as the ground end.
Optionally, in order to protect the circuit, a fuse F1 may be further disposed in the circuit, as shown in fig. 3, one end of the fuse F1 is connected to the pin 1, and the other end of the fuse F1 is connected to one end of the fourth capacitor C4.
Optionally, the rectifying input module 300 further includes a first common-mode inductance L1, a second common-mode inductance L2, a fourth resistor R4, a fifth resistor R5, and a fifth capacitor C5;
the first pin of the first common-mode inductor L1 is connected with one end of a fourth capacitor C4, the second pin of the first common-mode inductor L1 is connected with one end of a fifth capacitor C5 and the third pin of the second common-mode inductor L2, the third pin of the first common-mode inductor L1 is connected with the other end of the fourth capacitor C4, and the fourth pin of the first common-mode inductor L1 is connected with the other end of the fifth capacitor C5 and one end of a fourth resistor R4;
the other end of the fourth resistor R4 is connected with a first pin of the second common-mode inductor L2;
the second pin of the second common-mode inductor L2 is connected with the anode of the third diode D3, and the fourth pin of the second common-mode inductor L1 is connected with the anode of the second diode D2;
the fifth resistor R5 is connected in parallel with the fourth capacitor C4.
By setting the first common-mode inductor L1 and the second common-mode inductor L2, common-mode electromagnetic interference signals can be filtered in the switching power supply.
Optionally, the power control module 400 includes a power chip U2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a sixth capacitor C6, a seventh capacitor C7, a sixth diode D6, and a seventh diode D7;
the D pin of the power chip U2 is connected with the anode of the sixth diode D6 and one end of the main winding, the VDD pin of the power chip U2 is connected with one end of the sixth resistor R6, one end of the seventh resistor R7 and one end of the sixth capacitor C6, the BIO pin of the power chip U2 is connected with one end of the eighth resistor R8 and one end of the ninth resistor R9, the CS pin of the power chip U2 is connected with one end of the tenth resistor R10, and the GND pin of the power chip U2 is grounded;
the cathode of the sixth diode D6 is connected with one end of the eleventh resistor R11 and one end of the seventh capacitor C7;
the other end of the sixth resistor R6, the other end of the eleventh resistor R11 and the other end of the seventh capacitor C7 are connected with the other end of the main winding;
the other end of the seventh resistor R7 is connected with the cathode of the seventh diode D7;
the other end of the eighth resistor R8 and the anode of the seventh diode D7 are connected with one end of an auxiliary winding, and the other end of the auxiliary winding is grounded;
the other end of the sixth capacitor C6, the other end of the ninth resistor R9, and the other end of the tenth resistor R10 are grounded.
Optionally, the output rectifying circuit module 500 includes a twelfth resistor R12, an eighth diode D8, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, and a third common-mode inductance L3;
an anode of the eighth diode D8 is connected with one end of the output winding, and a cathode of the eighth diode D8 is connected with one end of the eighth capacitor C8 and a third pin of the third common-mode inductor L3;
the other ends of the first pin of the third common mode inductor L3 and the eighth capacitor C8 are connected with the other end of the output winding;
the second pin of the third common mode inductor L3 is connected with one end of a ninth capacitor C9;
the other ends of the fourth pin of the third common mode inductor L3 and the ninth capacitor C9 are grounded;
the twelfth resistor R12 and the tenth capacitor C10 are connected in series and then connected in parallel with the eighth diode D8.
In practice, one end of the ninth capacitor C9 may be considered as an output positive terminal Vout for connecting with an external device to supply power to the external device.
Optionally, the negative feedback module 600 includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eleventh capacitor C11, a twelfth capacitor C12, an adjustable voltage regulator U3, and an optocoupler U4;
one input end of the optical coupler U4 is connected with one end of a thirteenth resistor R13 and one end of a fourteenth resistor R14, two input ends of the optical coupler U4 are connected with the other end of the thirteenth resistor R13, one end of an eleventh capacitor C11 and a cathode of the adjustable voltage stabilizer U3, one output end of the optical coupler U4 is connected with one end of a twelfth capacitor C12, and two output ends of the optical coupler U4 are connected with the other end of the twelfth capacitor C12 and the power supply control module 400;
the other end of the eleventh capacitor C11 is connected with one end of the fifteenth resistor R15;
the other end of the fifteenth resistor R15 is connected with one end of the sixteenth resistor R16, one end of the seventeenth resistor R17 and the reference end of the adjustable voltage stabilizer U3;
the other end of the fourteenth resistor R14 and the other end of the sixteenth resistor R16 are connected with the output rectifying circuit module 500;
the anode of the adjustable voltage regulator U3, the other end of the seventeenth resistor R17, and one end of the twelfth capacitor C12 are grounded.
In implementation, as shown in fig. 3, for ease of understanding, flyback transformer T1 includes pin 1, pin 3, pin 4, pin 5, pin 6, pin 7, pin 9 and pin 10, wherein one end of the main winding is pin 3, the other end of the main winding is pin 1, the other end of the auxiliary winding is pin 4, one end of the auxiliary winding is pin 5, the other end of the voltage detection winding is pin 6, one end of the voltage detection winding is pin 7, the other end of the output winding is pin 9, and one end of the output winding is pin 10.
Alternatively, the main winding, the auxiliary winding and the output winding may constitute a switching power supply transformer structure. Pin 3, pin 5 and pin 10 are the same name end and pin 6 and pin 3, pin 5 and pin 10 are different name ends. In the flyback transformer T1, the main winding, the auxiliary winding, the voltage detection winding and the output winding are coils, and when two mutual inductance coils are supplied with current and the directions of magnetic fluxes generated by the two mutual inductance coils are the same, the current inflow ends of the two coils are called as homonymous ends (also called as homonymous ends), and conversely are heteronymous ends.
In practice, the formula for calculating the input voltage value is as follows:
in the formula (1), vin is the theoretical value of the input voltage, vac is the voltage value of the AD port of the back-end controller U1, V D1 N (1-3) is the number of turns of the main winding (corresponding to pin 1 and pin 3) and N (6-7) is the number of turns of the voltage detection winding (corresponding to pin 6 and pin 7) for the forward voltage drop of the first diode D1.
Example IV
In some alternative embodiments, the present application also provides an electrical device including a flyback transformer input voltage detection circuit structure as described above.
It will be clear to those skilled in the art that, for convenience and indirection of the description, the structure and implementation principle of the electrical apparatus described above may refer to the corresponding structure and implementation principle in the first to third embodiments, and are not repeated herein.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (9)
1. A flyback transformer input voltage detection circuit structure, comprising:
the input voltage stress module is arranged at the secondary of the flyback transformer and is used for generating stress voltage along with the change of the input voltage of the flyback transformer;
the voltage detection module is connected with the input voltage stress module and used for detecting the stress voltage so as to output a detection voltage signal to the rear-end controller.
2. The flyback transformer input voltage detection circuit structure of claim 1 wherein the input voltage stress module comprises a voltage detection winding;
one end of the voltage detection winding is connected with the input negative electrode of the voltage detection circuit, and the other end of the voltage detection winding is connected with the input positive electrode of the voltage detection circuit.
3. The flyback transformer input voltage detection circuit structure of claim 2 wherein the voltage detection module comprises a first diode, a first resistor, a second resistor, a third resistor, and a first capacitor;
the anode of the first diode is connected with the other end of the voltage detection winding, and the cathode of the first diode is grounded through the first resistor, the second resistor and the third resistor which are sequentially connected in series;
the circuit between the first resistor and the second resistor is grounded through the first capacitor;
the circuit between the second resistor and the third resistor is connected with the AD port of the rear end controller;
and one end of the third resistor, which is grounded, is connected with one end of the voltage detection winding.
4. The flyback transformer input voltage detection circuit of claim 3 wherein the voltage detection module further comprises a zener diode and a second capacitor;
one end of the cathode of the voltage stabilizing diode and one end of the second capacitor are connected with an AD port of the rear-end controller;
the anode of the voltage stabilizing diode and the other end of the second capacitor are grounded.
5. The flyback transformer input voltage detection circuit structure of claim 1 further comprising:
a rectification input module connected with the main winding of the flyback transformer;
the power supply control module is connected with the auxiliary winding of the flyback transformer and the rectification input module;
an output rectifying circuit module connected with an output winding of the flyback transformer; and
and the negative feedback module is connected with the power supply control module and the output rectifying circuit module.
6. The flyback transformer input voltage detection circuit of claim 5 wherein the power control module comprises a power chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a sixth capacitor, a seventh capacitor, a sixth diode, and a seventh diode;
the D pin of the power chip is connected with the anode of the sixth diode and one end of the main winding, the VDD pin of the power chip is connected with one end of the sixth resistor, one end of the seventh resistor and one end of the sixth capacitor, the BIO pin of the power chip is connected with one end of the eighth resistor and one end of the ninth resistor, the CS pin of the power chip is connected with one end of the tenth resistor, and the GND pin of the power chip is grounded;
the cathode of the sixth diode is connected with one end of the eleventh resistor and one end of the seventh capacitor;
the other end of the sixth resistor, the other end of the eleventh resistor and the other end of the seventh capacitor are connected with the other end of the main winding;
the other end of the seventh resistor is connected with the cathode of the seventh diode;
the other end of the eighth resistor and the anode of the seventh diode are connected with one end of the auxiliary winding, and the other end of the auxiliary winding is grounded;
the other end of the sixth capacitor, the other end of the ninth resistor and the other end of the tenth resistor are grounded.
7. The flyback transformer input voltage detection circuit of claim 5 wherein the output rectifier circuit module comprises a twelfth resistor, an eighth diode, an eighth capacitor, a ninth capacitor, a tenth capacitor, and a third common-mode inductor;
the anode of the eighth diode is connected with one end of the output winding, and the cathode of the eighth diode is connected with one end of the eighth capacitor and the third pin of the third common-mode inductor;
the first pin of the third common mode inductor and the other end of the eighth capacitor are connected with the other end of the output winding;
the second pin of the third common mode inductor is connected with one end of the ninth capacitor;
the fourth pin of the third common mode inductor is grounded to the other end of the ninth capacitor;
the twelfth resistor and the tenth capacitor are connected in series and then connected in parallel with the eighth diode.
8. The flyback transformer input voltage detection circuit of claim 5 wherein the negative feedback module comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eleventh capacitor, a twelfth capacitor, an adjustable voltage regulator, and an optocoupler;
the input end of the optocoupler is connected with one end of the thirteenth resistor and one end of the fourteenth resistor, the input two ends of the optocoupler are connected with the other end of the thirteenth resistor, one end of the eleventh capacitor and the cathode of the adjustable voltage stabilizer, the output end of the optocoupler is connected with one end of the twelfth capacitor, and the output two ends of the optocoupler are connected with the other end of the twelfth capacitor and the power supply control module;
the other end of the eleventh capacitor is connected with one end of the fifteenth resistor;
the other end of the fifteenth resistor is connected with one end of the sixteenth resistor, one end of the seventeenth resistor and the reference end of the adjustable voltage stabilizer;
the other end of the fourteenth resistor and the other end of the sixteenth resistor are connected with the output rectifying circuit module;
the anode of the adjustable voltage stabilizer, the other end of the seventeenth resistor and one end of the twelfth capacitor are grounded.
9. An electrical device comprising a flyback transformer input voltage detection circuit arrangement according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320730044.4U CN219496509U (en) | 2023-03-23 | 2023-03-23 | Flyback transformer input voltage detection circuit structure and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320730044.4U CN219496509U (en) | 2023-03-23 | 2023-03-23 | Flyback transformer input voltage detection circuit structure and electrical equipment |
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| CN219496509U true CN219496509U (en) | 2023-08-08 |
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| CN202320730044.4U Active CN219496509U (en) | 2023-03-23 | 2023-03-23 | Flyback transformer input voltage detection circuit structure and electrical equipment |
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2023
- 2023-03-23 CN CN202320730044.4U patent/CN219496509U/en active Active
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