CN-224233338-U - Overcurrent protection circuit, compressor detection circuit and air conditioner

CN224233338UCN 224233338 UCN224233338 UCN 224233338UCN-224233338-U

Abstract

The application discloses an overcurrent protection circuit, a compressor detection circuit and an air conditioner, wherein the overcurrent protection circuit comprises a filtering module, an overcurrent protection module and a filtering compensation module, the filtering module is used for being connected into a current sampling end of a compressor and performing filtering treatment on an overcurrent detection voltage input by the current sampling end, the overcurrent protection module is used for outputting an overcurrent protection signal when the overcurrent detection voltage after the filtering treatment is larger than a preset reference voltage, and the filtering compensation module is used for performing filtering compensation on the overcurrent detection voltage according to the overcurrent protection signal when the actual bus voltage of the compressor is smaller than a preset threshold voltage and the current detection voltage of the compressor is smaller than the preset reference voltage. The application can relieve the problem of false triggering of the overcurrent protection caused by unrealistic overcurrent detection voltage, thereby improving the reliability of the overcurrent protection.

Inventors

ZHONG HAIWANG
XU WENYI
XIONG JUN
YE WOLIN

Assignees

TCL空调器(中山)有限公司

Dates

Publication Date: 20260512
Application Date: 20250331

Claims (10)

1. An overcurrent protection circuit is applied to an air conditioner, the air conditioner comprises a compressor, and the overcurrent protection circuit is characterized by comprising: the filtering module is used for being connected to a current sampling end of the compressor and filtering the overcurrent detection voltage input by the current sampling end; the overcurrent protection module is used for outputting an overcurrent protection signal when the overcurrent detection voltage after the filtering treatment is greater than a preset reference voltage; The device comprises a filtering compensation module, a current detection module and an overcurrent protection module, wherein the filtering compensation module is connected with the filtering module and the overcurrent protection module and is used for carrying out filtering compensation on the overcurrent detection voltage according to the overcurrent protection signal when the actual bus voltage of the compressor is smaller than a preset threshold voltage and the current detection voltage of the compressor is smaller than a preset reference voltage.
2. The overcurrent protection circuit of claim 1, wherein the filter compensation module comprises a filter compensation unit and an access control unit, the filter compensation unit being connected to the filter module and the overcurrent protection module, the access control unit being connected to the filter compensation unit; The access control unit is used for controlling the compensation unit to be accessed into the filtering module according to the overcurrent protection signal when the actual bus voltage of the compressor is smaller than a preset threshold voltage and the actual detection voltage of the compressor is smaller than a preset reference voltage, and filtering compensation is carried out on the overcurrent detection voltage.
3. The overcurrent protection circuit according to claim 2, wherein the filter compensation unit includes a first capacitor, one end of the first capacitor is connected to the filter module and the overcurrent protection module, and the other end of the first capacitor is connected to the access control unit.
4. The overcurrent protection circuit according to claim 3, wherein the access control unit comprises a controller and a switching tube, a first end of the switching tube is connected with the controller, a second end of the switching tube is connected with the other end of the first capacitor, and a third end of the switching tube is grounded; The controller is used for controlling the switching tube to be conducted when the actual bus voltage of the compressor is smaller than a preset threshold voltage and the actual detection voltage of the compressor is smaller than a preset reference voltage.
5. The overcurrent protection circuit according to any one of claims 1 to 4, wherein the filter module includes a first resistor and a second capacitor, one end of the second capacitor is connected to one end of the first resistor and the overcurrent protection module, the other end of the first resistor is connected to the current sampling end, and the other end of the second capacitor is grounded.
6. The overcurrent protection circuit of claim 5, wherein the overcurrent protection module comprises a first operational amplifier, a second resistor, a third resistor, a fourth resistor and a third capacitor, wherein the non-inverting input terminal of the first operational amplifier is connected with the filter module, the inverting input terminal of the first operational amplifier is connected with the non-inverting input terminal of the first operational amplifier, one end of the third resistor, one end of the fourth resistor and one end of the third capacitor, the other end of the third resistor, the other end of the fourth resistor and the other end of the third capacitor are all grounded, one end of the second resistor is connected with the non-inverting input terminal of the first operational amplifier, and the other end of the second resistor is electrically connected.
7. A compressor detection circuit, the compressor detection circuit comprising: the overcurrent protection circuit according to any one of claims 1 to 6; The voltage detection module is used for sampling the bus voltage of the compressor and then outputting the actual bus voltage to the filtering compensation module in the overcurrent protection circuit; The current detection module is used for being connected with a current sampling end of the compressor, and amplifying the overcurrent detection voltage input by the current sampling end so as to output the current detection voltage to the filtering compensation module.
8. The compressor detection circuit of claim 7, wherein the current detection module comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and a second operational amplifier, wherein one end of the fifth resistor is connected with the current sampling end, the other end of the fifth resistor is connected with the normal phase input end of the second operational amplifier, one end of the third capacitor, one end of the fifth capacitor and one end of the sixth resistor are all connected with the normal phase input end of the second operational amplifier, the other end of the sixth resistor and the other end of the fifth capacitor are all connected with electricity, one end of the sixth resistor, one end of the seventh capacitor and one end of the seventh capacitor are all connected with the inverting input end of the second operational amplifier, the other end of the sixth capacitor and the other end of the sixth capacitor are all grounded, the other end of the seventh capacitor and the other end of the seventh capacitor are all connected with the inverting input end of the second operational amplifier, and the other end of the eighth resistor is all connected with the output end of the fourth capacitor and the eighth amplifier.
9. The compressor detection circuit of claim 7, wherein the voltage detection module comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a clamping diode, and an eighth capacitor, wherein one end of the ninth resistor and one end of the eighth capacitor are connected to the filter compensation module, one end of the ninth resistor, a first end of the clamping diode, and one end of the twelfth resistor are connected to one end of the thirteenth resistor, the other end of the eighth resistor, the other end of the thirteenth resistor, and a second end of the clamping diode are grounded, a third end of the clamping diode is electrically connected, the other end of the twelfth resistor is connected to one end of the tenth resistor through the eleventh resistor, and the other end of the tenth resistor is electrically connected to one end of the tenth resistor.
10. An air conditioner comprising a compressor and a compressor detection circuit as claimed in any one of claims 7 to 9.

Description

Overcurrent protection circuit, compressor detection circuit and air conditioner Technical Field The application relates to the technical field of electronics, in particular to an overcurrent protection circuit, a compressor detection circuit and an air conditioner. Background With the increasing popularization of household variable frequency air conditioners, the requirements on the quality of the air conditioner are higher and higher at present. The intelligent degree of the air conditioner is also higher and higher, and the use environment is also more and more complex. Once the power grid voltage clutter or other household appliances interfere, the capacitance of the ceramic chip of some key circuits on the air conditioner external machine board is reduced along with the time, so that the authenticity of the sampling signal of the main chip port can be influenced, the fault is wrongly reported, and the reliability of the product is influenced. Thus, there is a need for improvement and advancement in the art. Disclosure of utility model The application provides an overcurrent protection circuit, a compressor detection circuit and an air conditioner, which can relieve the problem of overcurrent protection false triggering caused by unrealistic sampling signals. The application provides an overcurrent protection circuit, which is applied to an air conditioner, wherein the air conditioner comprises a compressor, and the overcurrent protection circuit comprises: the filtering module is used for being connected to a current sampling end of the compressor and filtering the overcurrent detection voltage input by the current sampling end; The overcurrent protection module is used for outputting an overcurrent protection signal when the overcurrent detection voltage after the filtering treatment is greater than a preset reference voltage; The device comprises a filtering compensation module, a filtering protection module and a control module, wherein the filtering compensation module is connected with the filtering module and the overcurrent protection module, and is used for carrying out filtering compensation on the overcurrent detection voltage according to an overcurrent protection signal when the actual bus voltage of the compressor is smaller than a preset threshold voltage and the current detection voltage of the compressor is smaller than a preset reference voltage. In some embodiments, the overcurrent protection circuit comprises a filtering compensation unit and an access control unit, wherein the filtering compensation unit is connected with the filtering module and the overcurrent protection module, and the access control unit is connected with the filtering compensation unit; And the controller is used for controlling the compensation unit to be connected to the filtering module according to the overcurrent protection signal when the actual bus voltage of the compressor is smaller than the preset threshold voltage and the actual detection voltage of the compressor is smaller than the preset reference voltage, and carrying out filtering compensation on the overcurrent detection voltage. In some embodiments, the overcurrent protection circuit includes a first capacitor, one end of the first capacitor is connected to the filter module and the overcurrent protection module, and the other end of the first capacitor is connected to the access control unit. In some embodiments, the over-current protection circuit comprises an access control unit and a switching tube, wherein a first end of the switching tube is connected with the controller, a second end of the switching tube is connected with the other end of the first capacitor, and a third end of the switching tube is grounded; The controller is used for controlling the switching tube to be conducted when the actual bus voltage of the compressor is smaller than a preset threshold voltage and the actual detection voltage of the compressor is smaller than a preset reference voltage. In some embodiments, the overcurrent protection circuit includes a first resistor and a second capacitor, one end of the second capacitor is connected to one end of the first resistor and the overcurrent protection module, the other end of the first resistor is connected to the current sampling end, and the other end of the second capacitor is grounded. In some embodiments, the overcurrent protection circuit includes a first operational amplifier, a second resistor, a third resistor, a fourth resistor and a third capacitor, where a positive input terminal of the first operational amplifier is connected to the filtering module, an negative input terminal of the first operational amplifier is connected to the positive input terminal of the first operational amplifier, one end of the third resistor, one end of the fourth resistor and one end of the third capacitor, the other end of the third resistor, the other end of the fourth resistor and the other end of the third capacitor ar