CN218850619U

CN218850619U - Voltage-withstanding circuit

Info

Publication number: CN218850619U
Application number: CN202223399747.8U
Authority: CN
Inventors: 马瑞杰; 孟伟; 张骏
Original assignee: Shanghai Musa Electronic Technology Co ltd
Current assignee: Shanghai Musa Electronic Technology Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-04-11
Anticipated expiration: 2032-12-19

Abstract

The application discloses withstand voltage circuit includes: the power supply module is used for accessing alternating current electric energy of an external power supply and outputting direct current electric energy to external equipment after processing the alternating current electric energy; the input end of the voltage-resistant module is electrically connected with the output end of the power supply module, and the voltage-resistant module is used for enhancing the voltage resistance of the direct-current electric energy accessed by the power supply module and then outputting the direct-current electric energy; the constant voltage output module, the input of constant voltage output module with the output electric connection of withstand voltage module, the constant voltage output module be used for with the electric energy constant voltage output of withstand voltage module output is exported to external equipment. The LED lamp voltage stabilizing device has the advantages that the voltage input in the higher voltage occasion is effectively reduced due to the fact that voltage fluctuation is far greater than the withstand voltage value in the switching power supply, the LED lamp is easily damaged, and accordingly the using condition of the LED lamp is influenced.

Description

Voltage withstand circuit

Technical Field

The application relates to the field of electrical equipment, in particular to a voltage-resistant circuit.

Background

The switching power supply is a power supply which utilizes the modern power electronic technology to control the on-off time ratio of a switching tube and maintain stable output voltage, and is widely applied to the fields of LED illumination, liquid crystal displays, LED lamps and lanterns and the like because the switching power supply has the advantages of high conversion efficiency, small size, light weight and the like.

In the related art, when the LED lamp is powered, a general supporting LED switching power supply supplies power to the LED lamp by direct current. However, in the situation of high voltage, the input voltage is much larger than the withstand voltage value in the switching power supply due to the voltage fluctuation, and the LED lamp is easily damaged, thereby affecting the use of the LED lamp.

SUMMERY OF THE UTILITY MODEL

In order to improve relevant in the occasion that the voltage is higher, because voltage fluctuation leads to the voltage of input to be greater than the withstand voltage value in the switching power supply far away, easily causes the damage to the LED lamp to influence the drawback of the use of LED lamp, this application provides a withstand voltage circuit.

The voltage-resistant circuit adopts the following technical scheme:

a voltage withstand circuit comprising:

the power supply module is used for accessing alternating current electric energy of an external power supply and outputting direct current electric energy to external equipment after processing the alternating current electric energy;

the input end of the voltage-resistant module is electrically connected with the output end of the power supply module, and the voltage-resistant module is used for enhancing the voltage resistance of the direct-current electric energy accessed by the power supply module and then outputting the direct-current electric energy;

the constant voltage output module, the input of constant voltage output module with the output electric connection of withstand voltage module, the constant voltage output module be used for with the electric energy constant voltage output to external equipment of withstand voltage module output.

Through adopting above-mentioned technical scheme, when supplying power to the LED lamp, external power supply's electric energy is carried to power module, and power module filters the interfering signal in to external power supply to output direct current to withstand voltage module. The withstand voltage value of the circuit is enhanced and output to the constant voltage output module through the withstand voltage module, so that the constant voltage output module receives a voltage signal output by the withstand voltage module and adjusts the voltage signal, stable voltage is output to external equipment, the voltage is effectively reduced in the higher occasion of the voltage, the voltage input is far greater than the withstand voltage value in the switching power supply due to voltage fluctuation, the LED lamp is easily damaged, and the use condition of the LED lamp is influenced.

Preferably, the voltage-withstanding module comprises a current-limiting unit for limiting the current of the power signal output by the power supply module and a voltage-withstanding unit for enhancing voltage withstanding, the output end of the current-limiting unit is electrically connected with the input end of the voltage-withstanding unit, and the output end of the voltage-withstanding unit is electrically connected with the input end of the constant-voltage output module.

Through adopting above-mentioned technical scheme, when supplying power to the LED lamp, external power supply's electric energy is carried to power module, and the power signal current-limiting to power module output through the current-limiting unit, the withstand voltage value of rethread withstand voltage unit reinforcing circuit is after exported to constant voltage output module for the voltage signal of withstand voltage module output is received to constant voltage output module, and adjusts it, thereby to the stable voltage of external equipment output.

Preferably, the current limiting unit includes a current limiting portion for limiting a current of the power signal output by the power supply module and a voltage stabilizing portion for stabilizing the current-limited power signal, and the current limiting portion is electrically connected to the voltage stabilizing portion.

By adopting the technical scheme, the current limiting part limits the current of the power supply signal output by the power supply module, and then the voltage-stabilizing part stabilizes and outputs the current-limited power supply signal to the voltage-resisting unit, so that the voltage-resisting value of the circuit is enhanced.

Preferably, the constant voltage output module includes a control unit for adjusting the voltage output by the voltage withstand unit and a voltage stabilizing output unit for transforming the voltage output by the control unit and then outputting the voltage to an external device, and the output end of the control unit is electrically connected to the input end of the voltage stabilizing output unit.

By adopting the technical scheme, when the constant voltage output module receives the voltage output by the voltage-resistant unit, the control unit adjusts the output voltage and outputs the adjusted output voltage to the voltage-stabilizing output unit, and then the regulated output voltage is constantly output to external equipment through the voltage-stabilizing output unit.

Preferably, the output end of the control unit is electrically connected to a transformer T1, and the output end of the transformer T1 is electrically connected to the input end of the voltage stabilizing output unit.

By adopting the technical scheme, after the control unit regulates the output voltage, the voltage output by the voltage-resisting unit is transformed by the transformer T1 and then output to the voltage-stabilizing output unit, so that the voltage is constantly output to external equipment for power supply.

Preferably, the control unit includes an overvoltage protection part for limiting a pulse leading edge spike voltage caused by the transformer T1 to a safe value and a control part for adjusting an output voltage of the regulated output unit.

By adopting the technical scheme, when the transformer T1 transforms the voltage output by the voltage-resistant unit, the transformer T1 causes the pulse front edge peak voltage, the pulse front edge peak voltage is limited to a safe value by the overvoltage protection part, and the voltage output by the voltage-stabilizing output unit is regulated by the control part.

Preferably, the control portion includes a control chip IC1 and a peripheral standard circuit of the control chip IC1, a drain pin of the control chip IC1 is electrically connected to the output end of the voltage withstanding unit, and both the control pin and a source pin of the control chip IC1 are electrically connected to the output end of the transformer T1.

By adopting the technical scheme, after the transformer T1 transforms the voltage output by the voltage-resistant module, the voltage signal is output to the control pin of the control chip IC1 through the transformer T1, and the control chip IC1 adjusts the voltage signal, so that the voltage is stably output.

Preferably, the power supply module includes an interference suppression unit for filtering an interference signal in the electric energy input by the external power supply and a rectification unit for rectifying the alternating current electric energy output by the interference suppression unit, an output end of the interference suppression unit is electrically connected to an input end of the rectification unit, and an output end of the rectification unit is electrically connected to an input end of the voltage-withstanding module.

By adopting the technical scheme, when the external power supply is connected, the interference suppression unit filters interference signals in electric energy input by the external power supply, and then the interference signals are output to the rectification unit to rectify the alternating current electric energy into direct current electric energy and output to the voltage-resistant module.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the voltage-withstanding value of the circuit is enhanced through the arrangement of the voltage-withstanding unit, and then stable voltage is output to external equipment through the voltage-stabilizing output unit, so that the situation that the LED lamp is easily damaged due to the fact that the input voltage is far greater than the voltage-withstanding value in the switching power supply due to voltage fluctuation on the occasion that the voltage is high is effectively reduced;

2. through the setting of interference suppression unit to carry out the filtering to the interference signal in the electric energy of external power source access.

Drawings

Fig. 1 is a schematic diagram of an overall circuit structure according to an embodiment of the present application.

Fig. 2 is a schematic circuit diagram of the voltage-resistant module in the embodiment of the present application.

Fig. 3 is a schematic circuit diagram of a constant voltage output module in the embodiment of the present application.

Description of reference numerals:

1. a power supply module; 11. an interference suppression unit; 12. a rectifying unit; 2. a voltage-withstanding module; 21. a current limiting unit; 211. a flow restriction portion; 212. a voltage stabilizing part; 22. a voltage withstand unit; 3. a constant voltage output module; 31. a control unit; 311. an overvoltage protection section; 312. a control unit; 32. and a voltage stabilization output unit.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

Referring to fig. 1, the present application discloses a voltage withstanding circuit, which includes a power supply module 1, a voltage withstanding module 2, and a constant voltage output module 3. The power supply module 1 is electrically connected with an external power supply, is used for accessing electric energy of the external power supply and outputting the electric energy to the voltage-resistant module 2; the voltage-withstanding module 2 is electrically connected with the constant-voltage output module 3, and is used for enhancing voltage withstanding of the electric energy accessed by the power supply module 1 and outputting the electric energy to the constant-voltage output module 3; the constant voltage output module 3 is used for outputting the electric energy output by the voltage-resistant module 2 to external equipment at constant voltage. In this embodiment, the external device is a device such as an LED lamp.

Referring to fig. 1, the power supply module 1 includes an interference suppression unit 11 and a rectification unit 12 electrically connected to the interference suppression unit 11, where the interference suppression unit 11 is configured to filter an interference signal in electric energy input by an external power supply, and the rectification unit 12 is configured to rectify ac electric energy output by the interference suppression unit 11 and output dc electric energy.

Referring to fig. 1, specifically, the interference suppression unit 11 includes a fuse FU, a first capacitor C1, and a first inductor L1, where the first capacitor C1 and the first inductor L1 are connected in parallel, and the first inductor L1 serves as a common mode choke. The input end of the first inductor L1 is electrically connected to the first capacitor C1, and the output end of the first inductor L1 is electrically connected to the input end of the rectifying unit 12. The electric energy of external power supply passes through fuse FU and carries to first electric capacity C1 and first inductance L1, through setting up fuse FU to the circuit of protection rear end, through setting up first electric capacity C1 and first inductance L1, common mode interference signal in the electric energy of external power supply input filters.

Referring to fig. 1, the rectifying unit 12 includes a rectifying bridge, an anode input end and a cathode input end of the rectifying bridge are electrically connected to an anode output end and a cathode output end of the first inductor L1, respectively, an output end of the rectifying bridge is further electrically connected to a filter capacitor C2, and an anode and a cathode of the filter capacitor C2 are electrically connected to the anode output end and the cathode output end of the rectifying bridge, respectively. When an external power supply is connected, alternating current electric energy is rectified into direct current electric energy through the rectifier bridge, strong high-frequency interference is easily generated after rectification, and direct current output by the rectifier bridge is filtered through the parallel filter capacitor C2.

Referring to fig. 1 and 2, the voltage withstand module 2 includes a current limiting unit 21 and a voltage withstand unit 22 electrically connected to the current limiting unit 21, where the current limiting unit 21 is configured to limit a current of a power signal output by the power supply module 1, and the voltage withstand unit 22 is configured to enhance a voltage withstand value in a circuit.

Referring to fig. 1 and 2, specifically, the current limiting unit 21 includes a current limiting portion 211 and a voltage stabilizing portion 212 electrically connected to the current limiting portion 211, where an input terminal of the current limiting portion 211 is electrically connected to an output terminal of the rectifier bridge for limiting a current of a power signal output by the rectifier bridge, and an input terminal of the voltage stabilizing portion 212 is electrically connected to an output terminal of the current limiting portion 211 for stabilizing the voltage of the current-limited power signal.

Referring to fig. 1 and 2, the current limiting portion 211 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, the first resistor R1, the second resistor R2, and the third resistor R3 are connected in series, the fourth resistor R4 is connected in parallel to the third resistor R3, and the third resistor R3 is electrically connected to the input end of the voltage stabilizing portion 212. The voltage stabilizing part 212 comprises a voltage stabilizing diode VD1, the anode of the voltage stabilizing diode VD1 is electrically connected to the third resistor R3, and the cathode of the voltage stabilizing diode VD1 is grounded. The current limiting unit 211 and the voltage stabilizing unit 212 are provided to limit the current of the power signal output from the rectifier bridge, and to output the regulated voltage to the voltage withstanding unit 22.

Referring to fig. 1 and 2, the voltage-withstanding unit 22 mainly includes a field-effect transistor Q1 and a voltage-stabilizing diode VD2, and the field-effect transistor Q1 is an insulated gate enhancement type field-effect transistor. The gate of the field-effect tube Q1 is electrically connected between the second resistor R2 and the third resistor R3, the drain of the field-effect tube Q1 is electrically connected with the output end of the rectifying unit 12 and the input end of the constant voltage output module 3, the source of the field-effect tube Q1 is electrically connected to the anode of the voltage-stabilizing diode VD2, and the cathode of the voltage-stabilizing diode VD2 is electrically connected between the second resistor R2 and the third resistor R3. When the current limiting unit 21 outputs the current-limited power signal to the voltage withstanding unit 22, the power signal output by the rectifying unit 12 passes through the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the voltage stabilizing diode VD1 to provide electric energy to the gate of the field effect transistor Q1, the field effect transistor Q1 receives the power signal output by the current limiting portion 211, and the voltage of the gate is smaller than a certain value, so that the field effect transistor Q1 is turned on. The field effect transistor Q1 is a power switching transistor, and the withstand voltage is enhanced by providing the field effect transistor Q1.

Referring to fig. 2 and 3, the constant voltage output module 3 includes a control unit 31 and a voltage stabilization output unit 32 electrically connected to the constant voltage control unit 31, wherein the control unit 31 is configured to adjust the voltage output by the voltage withstanding unit 22 and output the adjusted voltage to the voltage stabilization output unit 32, and the voltage stabilization output unit 32 is configured to transform the voltage output by the control unit 31 and output the transformed voltage to an external device.

Referring to fig. 2 and 3, in particular, the control unit 31 includes an overvoltage protection portion 311 and a control portion 312 electrically connected to the overvoltage protection portion 311, an input end of the overvoltage protection portion 311 is electrically connected to an output end of the rectifying unit 12, an output end of the overvoltage protection portion 311 is electrically connected to a transformer T1, and the overvoltage protection portion 311 is configured to limit a pulse front edge spike voltage caused by the transformer T1 to a safe value. The input terminal of the control portion 312 is electrically connected to the output terminal of the voltage-withstanding unit 22, and is used for adjusting the voltage-stabilizing output unit 32 to stably output a constant voltage.

Referring to fig. 2 and 3, the transformer T1 includes a primary coil and two secondary coils, and the primary coil of the transformer T1 is electrically connected to the overvoltage protection part 311. The two secondary coils are respectively a first primary coil and a second primary coil, the first secondary coil of the transformer T1 is electrically connected to the voltage stabilization output unit 32, and the second secondary coil is electrically connected to the control portion 312.

Referring to fig. 2 and 3, the overvoltage protection part 311 includes a zener diode VD3 and a diode D3 connected in series, wherein an anode of the zener diode VD3 is electrically connected to the input terminal of the transformer T1, a cathode of the zener diode VD3 is electrically connected to a cathode of the diode D3, and a cathode of the diode D3 is electrically connected to the input terminal of the transformer T1, so as to limit the pulse front peak voltage caused by the transformer T1 to a safe value.

Referring to fig. 2 and 3, the control section 312 includes a control chip IC1 and a peripheral standard circuit of the control chip IC1, and the model of the control chip IC1 is a TOP210 chip. A drain pin of the TOP210 chip is electrically connected to the drain of the fet Q1, a control pin of the TOP210 chip is electrically connected to the second secondary winding of the transformer T1, and a source pin of the TOP210 chip is electrically connected to the first secondary winding of the transformer T1. After the transformer T1 transforms the voltage output by the voltage-withstanding module 2, the transformer T1 outputs a voltage signal to a control pin of the TOP210 chip, and the TOP210 chip adjusts the voltage signal, thereby stabilizing the output voltage.

Referring to fig. 2 and 3, the voltage regulation output unit 32 includes a diode D4, a filter capacitor C4, a second inductor L2, and a filter capacitor C5, wherein an anode of the diode D4 is electrically connected to the first secondary winding of the transformer T1, and the filter capacitor C4 and the filter capacitor C5 are connected in parallel. The positive electrode and the negative electrode of the filter capacitor C4 are respectively and electrically connected to the first secondary coil of the transformer T1, and similarly, the positive electrode and the negative electrode of the filter capacitor C5 are respectively and electrically connected to the first secondary coil of the transformer T1. When the transformer T1 transforms the voltage output by the voltage-withstanding module 2, the voltage is rectified by the diode D4, filtered by the filter capacitor C4, the second inductor L2, and the filter capacitor C5, and then the voltage is output to an external device.

The implementation principle of the embodiment of the application is as follows: when the LED lamp is powered, the electric energy of the external power supply is transmitted to the power supply module 1, the interference suppression unit 11 filters the interference signal in the external power supply, and transmits the filtered interference signal to the rectification unit 12 for rectification, and then outputs the direct current to the current limiting unit 21 and the voltage withstanding unit 22. The current limiting unit 21 is used for limiting the current of the power supply signal output by the power supply module 1, and the voltage withstanding unit 22 is used for enhancing the withstand voltage value of the circuit and outputting the circuit to the constant voltage output module 3, so that the control pin of the control chip IC1 receives and adjusts the voltage signal output by the transformer T1. The voltage stabilizing output unit 32 is used for outputting the voltage output by the transformer T1 after stabilizing the voltage, so as to output a stable voltage to external equipment, thereby effectively reducing the situation that the voltage input by the voltage stabilizing output unit is far greater than the withstand voltage value in the switching power supply due to voltage fluctuation in the situation with a high voltage, and the LED lamp is easily damaged, so that the use of the LED lamp is influenced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A voltage withstand circuit, comprising:

the power supply system comprises a power supply module (1), a power supply module and a power supply module, wherein the power supply module (1) is used for accessing alternating current electric energy of an external power supply and outputting direct current electric energy to external equipment after processing the alternating current electric energy;

the input end of the voltage-withstanding module (2) is electrically connected with the output end of the power supply module (1), and the voltage-withstanding module (2) is used for enhancing the withstand voltage of the direct-current electric energy accessed by the power supply module (1) and then outputting the direct-current electric energy;

constant voltage output module (3), the input of constant voltage output module (3) with the output electric connection of withstand voltage module (2), constant voltage output module (3) be used for with the electric energy constant voltage output to external equipment of withstand voltage module (2) output.

2. A voltage withstand circuit according to claim 1, wherein: withstand voltage module (2) including be used for with current-limiting unit (21) of the power signal current-limiting of power module (1) output and be used for strengthening withstand voltage unit (22), the output of current-limiting unit (21) with the input electric connection of withstand voltage unit (22), the output electric connection of withstand voltage unit (22) in the input of constant voltage output module (3).

3. A voltage withstand circuit according to claim 2, wherein: the current limiting unit (21) comprises a current limiting part (211) used for limiting the current of the power supply signal output by the power supply module (1) and a voltage stabilizing part (212) used for stabilizing the voltage of the power supply signal after current limiting, and the current limiting part (211) is electrically connected to the voltage stabilizing part (212).

4. A voltage withstand circuit according to claim 2, wherein: the constant voltage output module (3) comprises a control unit (31) and a voltage stabilizing output unit (32), wherein the control unit (31) is used for outputting the voltage output by the voltage withstand unit (22) after adjustment, the voltage stabilizing output unit (32) is used for outputting the voltage output by the control unit (31) to external equipment after transformation, and the output end of the control unit (31) is electrically connected to the input end of the voltage stabilizing output unit (32).

5. A voltage withstand circuit according to claim 4, wherein: the output end of the control unit (31) is electrically connected with a transformer T1, and the output end of the transformer T1 is electrically connected with the input end of the voltage-stabilizing output unit (32).

6. A voltage withstand circuit according to claim 5, wherein: the control unit (31) comprises an overvoltage protection part (311) for limiting the pulse leading edge spike voltage caused by the transformer T1 to a safe value and a control part (312) for regulating the output voltage of the regulated output unit (32).

7. A voltage withstand circuit according to claim 6, wherein: the control part (312) comprises a control chip IC1 and a peripheral standard circuit of the control chip IC1, a drain electrode pin of the control chip IC1 is electrically connected to the output end of the voltage-resisting unit (22), and a control pin and a source electrode pin of the control chip IC1 are both electrically connected to the output end of the transformer T1.

8. A voltage withstand circuit according to claim 1, wherein: the power supply module (1) comprises an interference suppression unit (11) and a rectification unit (12), wherein the interference suppression unit (11) is used for filtering interference signals in electric energy input by an external power supply, the rectification unit (12) is used for rectifying alternating current electric energy output by the interference suppression unit (11), the output end of the interference suppression unit (11) is electrically connected with the input end of the rectification unit (12), and the output end of the rectification unit (12) is electrically connected with the input end of the voltage-resistant module (2).