Overcurrent protection circuit, driving device and electrical equipment

Abstract

The utility model relates to an overcurrent protection circuit, a driving device and electrical equipment. The output end of an overcurrent protection adjusting module is electrically connected with the first input end of a comparator module, and the second input end of the comparator module is electrically connected with the sampling output end of a load driving module; the output end of the comparator module is electrically connected with the input end of the digital signal processing module, so that the comparator module can compare a reference signal output by the overcurrent protection adjusting module with a sampling signal corresponding to the load driving module and output a comparison result signal to the digital signal processing module; therefore, the digital signal processing module outputs the overcurrent protection signal according to the comparison result signal, the overcurrent protection value can be adjusted through the overcurrent protection adjusting module while overcurrent protection is achieved, the problem that different loads cannot be compatible due to the fact that the overcurrent protection value is fixed in the prior art is solved, and compatibility is improved.

Description

Technical Field

[0001] The present application relates to the field of drive protection technology, and in particular to an overcurrent protection circuit, a drive device, and an electrical device. Background Art

[0002] With the rapid development of DC variable frequency technology, more and more devices use variable frequency drive technology to drive loads such as motors.

[0003] Specifically, DC frequency conversion technology is currently used to drive motor loads. Usually, the input AC power is rectified into DC power transmitted by the DC bus through a rectifier bridge, and then inverted through an insulated-gate bipolar transistor (IGBT) or silicon carbide (SiC) switching transistor to output equivalent AC power to drive the motor. At the same time, in order to deal with abnormal conditions that may occur during the operation of the motor, additional protection circuits such as overcurrent protection, overvoltage protection, and temperature protection are usually set to respond in time when the motor is operating abnormally. However, commonly used overcurrent protection circuits can often only set a fixed protection value. When facing different loads, only driver boards with different protection values ​​can be used to drive different loads respectively, resulting in poor compatibility. Utility Model Content

[0004] In view of this, the present application provides an overcurrent protection circuit, a driving device and an electrical device to solve the problem of poor compatibility caused by the fixed overcurrent protection value in the existing related technology.

[0005] In a first aspect, an embodiment of the present application provides an overcurrent protection circuit, comprising: an overcurrent protection adjustment module, a comparator module, a digital signal processing module, and a load driving module;

[0006] The output end of the overcurrent protection adjustment module is electrically connected to the first input end of the comparator module, the second input end of the comparator module is electrically connected to the sampling output end of the load driving module, the output end of the comparator module is electrically connected to the input end of the digital signal processing module, and the output end of the digital signal processing module is electrically connected to the driving control end of the load driving module;

[0007] The overcurrent protection adjustment module is used to adjust the overcurrent protection value according to the adjustment control signal corresponding to the load, and output a reference signal corresponding to the overcurrent protection value;

[0008] The comparator module is configured to compare the reference signal with the sampling signal corresponding to the load driving module and output a comparison result signal;

[0009] The digital signal processing module is used to output an overcurrent protection signal according to the comparison result signal, and the overcurrent protection signal is used to trigger the load driving module to stop driving the load.

[0010] Optionally, the overcurrent protection adjustment module includes: a resistor voltage dividing unit, at least two adjustment output units and a switch control unit;

[0011] The switch control unit includes control switches connected to the adjustment output units in a one-to-one correspondence;

[0012] A first end of each control switch is electrically connected to the output end of the resistance voltage divider unit, and a second end of each control switch is electrically connected to the control input end of a target regulation output unit, wherein the target regulation output unit is a regulation output unit correspondingly connected to the control switch;

[0013] The output terminal of the adjustment output unit is electrically connected to the first input terminal of the comparator module;

[0014] The regulating control signal is used to control the switching state of each control switch in the switch control unit;

[0015] The output end of the adjustment output unit is used to output the reference signal.

[0016] Optionally, the resistance voltage dividing unit includes a first resistor and a second resistor;

[0017] The first end of the first resistor is electrically connected to the first power supply end of the overcurrent protection circuit, the second end of the first resistor, the second end of the second resistor and the first end of the control switch are electrically connected, and the second end of the second resistor is electrically connected to the reference ground of the overcurrent protection circuit.

[0018] Optionally, each of the regulating output units includes a transistor and a voltage dividing resistor;

[0019] The first end of the transistor is electrically connected to the second power supply end of the overcurrent protection circuit through the voltage-dividing resistor, the second end of the transistor is electrically connected to the first input end of the comparator module, and the control end of the transistor is electrically connected to the second end of the target control switch;

[0020] The target control switch is a control switch correspondingly connected to the transistor.

[0021] Optionally, each of the regulating output units includes a transistor and a voltage dividing resistor;

[0022] The first end of the transistor is electrically connected to the second power supply end of the overcurrent protection circuit, the second end of the transistor is electrically connected to the first input end of the comparator module through the voltage divider resistor, and the control end of the transistor is electrically connected to the second end of the target control switch;

[0023] The target control switch is a control switch correspondingly connected to the transistor.

[0024] Optionally, the comparator module includes a comparator and a filter circuit unit;

[0025] The input end of the filter circuit unit is electrically connected to the sampling output end of the load driving module, and the output end of the filter circuit unit is electrically connected to the first input end of the comparator;

[0026] The second input terminal of the comparator is electrically connected to the output terminal of the overcurrent protection adjustment module, and the output terminal of the comparator is electrically connected to the digital signal processing module;

[0027] The sampling output end of the load driving module is used to output the sampling signal;

[0028] The output terminal of the comparator is used to output the comparison result signal.

[0029] Optionally, the filtering circuit unit includes a current limiting resistor and a filtering capacitor;

[0030] The first end of the current limiting resistor is electrically connected to the sampling output end of the load driving module, the second end of the current limiting resistor, the first end of the filter capacitor and the first input end of the comparator are electrically connected, and the second end of the filter capacitor is electrically connected to the reference ground of the overcurrent protection circuit.

[0031] Optionally, the digital signal processing module includes a delay unit and a digital signal processing unit;

[0032] The input end of the delay unit is electrically connected to the output end of the comparator module, the output end of the delay unit is electrically connected to the overcurrent protection end of the digital signal processing unit, and the overcurrent protection output end of the digital signal processing unit is electrically connected to the drive control end of the load driving module;

[0033] The input end of the delay unit is used to receive the comparison result signal;

[0034] The overcurrent protection output terminal of the digital signal processing unit is used to output the overcurrent protection signal.

[0035] Optionally, the load driving module includes a sampling resistor, a bus capacitor, a rectifier bridge and a power switch device;

[0036] The first end of the rectifier bridge, the first end of the bus capacitor, and the first end of the power switch device are electrically connected; the second end of the rectifier bridge, the second end of the bus capacitor, and the second end of the sampling resistor are electrically connected; the first end of the sampling resistor, the second end of the power switch device, and the second input end of the comparator module are electrically connected;

[0037] The control terminal of the power switch device is used to receive the overcurrent protection signal;

[0038] The power switching device is used to drive the load.

[0039] In a second aspect, an embodiment of the present application provides a driving device comprising an overcurrent protection circuit as described in any one of the first aspects of the present application.

[0040] In a second aspect, an embodiment of the present application provides a household appliance, wherein a driving board of the household appliance includes an overcurrent protection circuit as described in any one of the first aspects of the present application.

[0041] The overcurrent protection circuit, driving device and electrical equipment provided in the embodiments of the present application are electrically connected to the first input end of the comparator module through the output end of the overcurrent protection adjustment module, the second input end of the comparator module is electrically connected to the sampling output end of the load driving module, and the output end of the comparator module is electrically connected to the input end of the digital signal processing module, so that the comparator module can compare the reference signal output by the overcurrent protection adjustment module with the sampling signal corresponding to the load driving module, and output the comparison result signal to the digital signal processing module, so that the digital signal processing module outputs an overcurrent protection signal based on the comparison result signal, so as to trigger the load driving module to stop driving the load through the overcurrent protection signal, thereby realizing overcurrent protection, and adjusting the overcurrent protection value through the overcurrent protection adjustment module, thereby realizing overcurrent protection value adjustment, thereby solving the problem of poor compatibility caused by the fixed overcurrent protection value in the existing related technology, and improving compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0045] Figure 1 A structural block diagram of an overcurrent protection circuit provided in an embodiment of the present application;

[0046] Figure 2 A schematic structural diagram of an overcurrent protection circuit provided in an optional embodiment of the present application;

[0047] Figure 3 A schematic structural diagram of an overcurrent protection regulation module provided in an optional embodiment of the present application;

[0048] Figure 4 A schematic diagram of the connection between an overcurrent protection adjustment module and a comparison module provided in an embodiment of the present application;

[0049] Figure 5 A schematic diagram of the circuit principle of an overcurrent protection circuit provided as an example of this application;

[0050] Figure 6 This is a schematic diagram of 49 different resistance combinations created by turning on different transistors in this application example;

[0051] Figure 7 A schematic structural diagram of a driving device provided in an embodiment of the present application;

[0052] Figure 8 A schematic diagram of the structure of an electrical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0055] In order to solve the problem that the overcurrent protection value of the existing driver board is fixed and is incompatible when facing loads with different characteristics, the embodiment of the present application provides an overcurrent protection circuit, a driving device and an electrical device, which include an overcurrent protection adjustment module, a comparator module, a digital signal processing (DSP) module and a load driving module. The overcurrent protection adjustment module adjusts the overcurrent protection value according to the adjustment control signal corresponding to the load to achieve overcurrent protection value adjustment, so that the overcurrent protection circuit can set different overcurrent protection values ​​as needed when facing loads with different characteristics, meet the overcurrent protection requirements of loads with different characteristics, and achieve the purpose of compatibility with loads with different characteristics.

[0056] Figure 1 This is a structural block diagram of an overcurrent protection circuit of a controller provided in an embodiment of the present application. Figure 1 As shown, the overcurrent protection circuit provided in the embodiment of the present application may specifically include: an overcurrent protection adjustment module 110, a comparator module 120, a digital signal processing module 130 and a load driving module 140; wherein, the output end of the overcurrent protection adjustment module 110 is electrically connected to the first input end of the comparator module 120, and the second input end of the comparator module 120 is electrically connected to the sampling output end of the load driving module 140, so that the comparator module 120 can compare the reference signal output by the overcurrent protection adjustment module 110 with the sampling signal corresponding to the load driving module 140, The output end of the comparator module 120 is electrically connected to the input end of the digital signal processing module 130, so that the comparator module 120 can output a comparison result signal to the digital signal processing module 130; and the output end of the digital signal processing module 130 is electrically connected to the drive control end of the load driving module 140, so that the digital signal processing module 130 can output an overcurrent protection signal based on the comparison result signal output by the digital signal processing module 130, so as to trigger the load driving module 140 to stop driving the load through the overcurrent protection signal, thereby realizing overcurrent protection of the load.

[0057] In an embodiment of the present application, the overcurrent protection adjustment module 110 is used to adjust the overcurrent protection value according to the adjustment control signal corresponding to the load, and output a reference signal corresponding to the overcurrent protection value to the comparator module 120, so that the comparator module 120 can compare the reference signal with the sampling signal corresponding to the load driving module 140, and output the comparison result signal to the digital signal processing module 130, so that the digital signal processing module 130 can output an overcurrent protection signal according to the comparison result signal to achieve overcurrent protection. Among them, the comparator module 120 is used to compare the reference signal with the sampling signal corresponding to the load driving module 140, and output the comparison result signal; the digital signal processing module 130 is used to output the overcurrent protection signal according to the comparison result signal, and the overcurrent protection signal is used to trigger the load driving module 140 to stop driving the load.

[0058] It can be seen that the overcurrent protection circuit provided in the embodiment of the present application adjusts the overcurrent protection value according to the adjustment control signal corresponding to the load through the overcurrent protection adjustment module 110, and the output end of the overcurrent protection adjustment module 110 is electrically connected to the first input end of the comparator module 120, the second input end of the comparator module 120 is electrically connected to the sampling output end of the load driving module 140, and the output end of the comparator module 120 is electrically connected to the input end of the digital signal processing module 130, so that the comparator module 120 can compare the reference signal output by the overcurrent protection adjustment module 110 with the sampling signal corresponding to the load driving module 140, and output the comparison result signal to the digital signal processing module 130, so that the digital signal processing module 130 can output the overcurrent protection signal according to the comparison result signal, and then the load driving module 140 can be triggered by the overcurrent protection signal to stop driving the load, thereby achieving overcurrent protection. This solves the problem in the existing related art that the overcurrent protection value in the overcurrent protection circuit is fixed and cannot be compatible with loads with different characteristics, thereby improving the compatibility of the overcurrent protection circuit.

[0059] For example, in order to solve the poor compatibility problem caused by the fixed overcurrent protection value of the existing driver board, the overcurrent protection circuit provided in the embodiment of the present application can be used as the overcurrent protection circuit of the driver board, so that the overcurrent protection value can be adjusted through the overcurrent protection adjustment module 110, so that the same model of driver board can drive multiple loads with different characteristics, solving the problem in the existing related technology that the driver board is incompatible with different loads due to the fixed overcurrent protection value, making the application of the driver board more flexible and improving the compatibility of the driver board.

[0060] In some optional embodiments of the present application, after receiving the adjustment control signal corresponding to the load, the overcurrent protection adjustment module 110 can control the adjustment output unit through the switch control unit to adjust the reference signal corresponding to the output current protection value of the adjustment output unit to achieve the adjustment of the overcurrent protection value.

[0061] Optional, such as Figure 2 As shown, the overcurrent protection adjustment module 110 in the embodiment of the present application includes: a resistor voltage divider unit 210, an adjustment output unit 220, and a switch control unit 230. The output end of the resistor voltage divider unit 210 is electrically connected to the input end of the switch control unit 230, and the output end of the switch control unit 230 is electrically connected to the control input end of the adjustment output unit 220. The control input end of the switch control unit 230 is used to receive an adjustment control signal corresponding to the load, so that the switch control unit 230 can control the switching state of each control switch in the switch control unit 230 according to the adjustment control signal, so as to transmit the voltage division signal provided by the resistor voltage divider unit 210 to the adjustment output unit 220 through the conductive control switch, so that the adjustment output unit 220 can output based on the voltage division signal, so as to form a reference signal corresponding to the overcurrent protection value based on the output signal of the adjustment output unit 220, thereby realizing overcurrent protection value adjustment.

[0062] The regulating control signal is used to control the switching state of each control switch in the switch control unit 230 .

[0063] In some optional embodiments of the present application, the resistor voltage divider unit 210 can serve as a voltage divider circuit in the overcurrent protection adjustment module 110, and based on the power supply signal provided by the first power supply end, divide the voltage through two or more voltage divider resistors to generate a voltage divider signal, which is transmitted to the switch control unit 230, so that the switch control unit 230 can transmit the voltage divider signal to the adjustment output unit 220 through the turned-on control switch based on the adjustment control signal, so as to output the reference signal corresponding to the overcurrent protection value through the adjustment output unit 220 based on the voltage divider signal.

[0064] For example, Figure 3As shown, the resistor voltage divider unit 210 in the embodiment of the present application includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is electrically connected to the first power supply terminal V1 of the overcurrent protection circuit, the second end of the first resistor R1, the second end of the second resistor R2 and the first end of the switch control unit 230 are electrically connected, and the second end of the second resistor R2 is electrically connected to the reference ground of the overcurrent protection circuit, so that the resistor voltage divider unit 210 can divide the voltage through the first resistor R1 and the second resistor R2 to generate a voltage division signal, and can transmit the voltage division signal to the switch control unit 230, so that the voltage division signal is transmitted to the adjustment output unit 220 through the switch control unit 230, so that the adjustment output unit 220 can output based on the voltage division signal, so that a reference signal corresponding to the overcurrent protection value can be formed based on the output signal of the adjustment output unit 220 to achieve overcurrent protection value adjustment.

[0065] In an optional embodiment of the present application, the overcurrent protection adjustment module 110 includes two or more adjustment output units 220; the switch control unit 230 includes control switches connected one-to-one with the adjustment output units 220, and the first end of each control switch is electrically connected to the output end of the resistor voltage divider unit 210, and the second end of each control switch is electrically connected to the control input end of the target adjustment output unit 220, so that the overcurrent protection adjustment module 110 can control the switching state of each control switch in the switch control unit 230 by adjusting the control signal to adjust the overcurrent protection value. The target adjustment output unit 220 is the adjustment output unit 220 corresponding to the control switch.

[0066] Specifically, in the embodiment of the present application, the overcurrent protection regulation module 110 includes a resistor divider unit 210, at least two regulation output units 220 and a switch control unit 230, and the switch control unit 230 includes a control switch connected one-to-one with the regulation output unit 220. For example, in the case where the overcurrent protection regulation module 110 includes 6 regulation output units 220, the switch control unit 230 includes 6 control switches connected one-to-one with the regulation output unit 220, and the first end of each control switch is electrically connected to the output end of the resistor divider unit 210, and the second end of each control switch is electrically connected to the control input end of the regulation output unit 220 to which it is connected, so that the output of the regulation output unit 220 to which it is connected can be controlled by the control switch to achieve adjustment of the overcurrent protection value.

[0067] In an embodiment of the present application, the output end of the adjustment output unit 220 is used to output the reference signal. For example, the output ends of all the adjustment output units 220 in the overcurrent protection adjustment module 110 are electrically connected to the first input end of the comparator module 120, so that the overcurrent protection adjustment module 110 can output the reference signal corresponding to the overcurrent protection value through the output end of the adjustment output unit 220, and can transmit the reference signal to the comparator module 120, so that the comparator module 120 can compare the reference signal with the sampling signal corresponding to the load driving module 140 based on the reference signal, and output a comparison result signal.

[0068] In an optional embodiment of the present application, each of the adjustment output units 220 may include a transistor and a voltage dividing resistor; Figure 4 As shown, the first end of the transistor is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit through the voltage-dividing resistor, the second end of the transistor is electrically connected to the first input terminal of the comparator module 120, and the control end of the transistor is electrically connected to the second end of the target control switch, so that the transistors of different adjustment output units 220 in the overcurrent protection adjustment module 110 can be controlled by the target control switch connected to their control ends to achieve adjustment of different overcurrent protection values. The target control switch is the control switch correspondingly connected to the transistor.

[0069] For example, when the overcurrent protection regulating module 110 includes 6 regulating output units, the 6 regulating output units may be respectively: a first regulating output unit, a second regulating output unit, a third regulating output unit, a fourth regulating output unit, a fifth regulating output unit and a sixth regulating output unit; Figure 5As shown, the first end of the transistor Q1 in the first regulating output unit is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit through the voltage-dividing resistor R3 in the first regulating output unit, the second end of the transistor Q1 in the first regulating output unit is electrically connected to the first input terminal of the comparator module 120, and the control end of the transistor Q1 in the first regulating output unit is electrically connected to the second end of the control switch connected thereto, so that the transistor Q1 can be controlled to be turned on or off by the control switch connected to the control end of the transistor Q1, thereby achieving the adjustment of the overcurrent protection value; similarly, the first end of the transistor Q2 in the second regulating output unit is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit through the voltage-dividing resistor R4 in the second regulating output unit. The second power supply terminal V2 of the overcurrent protection circuit is electrically connected, the second end of the transistor Q2 in the second adjustment output unit is electrically connected to the first input terminal of the comparator module, and the control end of the transistor Q2 in the second adjustment output unit is electrically connected to the second end of the control switch connected thereto, so that the transistor Q2 can be controlled to be turned on or off by the control switch connected to the control end of the transistor Q2, thereby adjusting the overcurrent protection value; the first end of the transistor Q3 in the third adjustment output unit is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit through the voltage divider resistor R5 in the third adjustment output unit, and the second end of the transistor Q3 in the third adjustment output unit is electrically connected to the first end of the comparator module 120. The input terminal is electrically connected, and the control terminal of the transistor Q3 in the third adjustment output unit is electrically connected to the second terminal of the control switch connected to it, so that the conduction or shutoff of the transistor Q3 can be controlled by the control switch connected to the control terminal of the transistor Q3, thereby realizing the adjustment of the overcurrent protection value; the first terminal of the transistor Q4 in the fourth adjustment output unit is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit through the voltage dividing resistor R6 in the fourth adjustment output unit, the second terminal of the transistor Q4 in the fourth adjustment output unit is electrically connected to the first input terminal of the comparator module 120, and the control terminal of the transistor Q4 in the fourth adjustment output unit is electrically connected to the second terminal of the control switch connected to it, The transistor Q4 can be turned on or off by the control switch connected to the control end of the transistor Q4, thereby adjusting the overcurrent protection value. The first end of the transistor Q5 in the fifth adjustment output unit is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit through the voltage divider resistor R7 in the fifth adjustment output unit, the second end of the transistor Q5 in the fifth adjustment output unit is electrically connected to the first input end of the comparator module 120, and the control end of the transistor Q5 in the fifth adjustment output unit is electrically connected to the second end of the control switch connected to the corresponding control end. Thus, the transistor Q5 can be turned on or off by the control switch connected to the control end of the transistor Q5, thereby adjusting the overcurrent protection value.A first end of the transistor Q6 in the sixth adjustment output unit is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit via the voltage-dividing resistor R8 in the fifth adjustment output unit. A second end of the transistor Q6 in the sixth adjustment output unit is electrically connected to the first input terminal of the comparator module 120. A control end of the transistor Q6 in the sixth adjustment output unit is electrically connected to the second end of the control switch to which it is connected. Thus, the control switch connected to the control end of the transistor Q6 can be used to control the on / off state of the transistor Q6, thereby adjusting the overcurrent protection value.

[0070] It can be seen that the transistors in different adjustment output units in the embodiment of the present application can be controlled by the control switch connected to their control ends. One end of the control switch is connected to the voltage divider circuit composed of the first voltage divider resistor R1 and the second voltage divider resistor R2, and the other end is connected to the control end of the transistor. For example, when a transistor is used as the transistor in the adjustment output unit 220, the base of the transistor can be used as the control end of the transistor and connected to the other end of the control switch, so that different transistors can be controlled by the control switch connected to their control ends, and then the corresponding connected voltage divider resistors can be connected to the circuit by turning on the transistor.

[0071] In the embodiment of the present application, the transistor in the regulation output unit 220 functions as a switch tube and can be replaced by other switch tubes or circuit elements such as relays with the same function. The embodiment of the present application does not limit this.

[0072] In addition, in addition to connecting the second end of the transistor to the first input end of the comparator module 120 in the embodiment of the present application, the adjustment output unit 220 can also be connected to the first input end of the comparator module 120 in other ways, such as connecting the voltage divider resistor in the adjustment output unit 220 to the first input end of the comparator module 120. The embodiment of the present application does not impose any specific restrictions on this.

[0073] Optionally, in the embodiment of the present application, when each adjustment output unit 220 includes a transistor and a voltage-dividing resistor, the first end of the transistor in each adjustment output unit 220 is electrically connected to the second power supply terminal V2 of the overcurrent protection circuit, the second end of the transistor is electrically connected to the first input terminal of the comparator module 120 through the voltage-dividing resistor, and the control end of the transistor is electrically connected to the second end of the target control switch, and the target control switch is a control switch connected corresponding to the transistor.

[0074] For example, when a transistor is used as the transistor in the regulation output unit 220, a dip switch K1 can be used as the switch control unit 230 in the overcurrent protection regulation module 110, connected to the base of the transistor, so that different transistors in the overcurrent protection regulation module 110 can be controlled by the dip switch. Specifically, the number of bits of the dip switch corresponds to the transistor, and each bit in the dip switch corresponds to a transistor. By dialing the dip switch to different positions, the bases of different transistors can be energized. The transistors with energized bases are turned on, and the corresponding series-connected voltage divider resistors are connected to the circuit, such as Figure 5 As shown in the figure, the transistor whose base is not energized is turned off, and the corresponding voltage divider resistor is not connected to the circuit. Then, the conduction of different transistors can be controlled by the dip switch to adjust the overcurrent protection value.

[0075] Of course, in addition to using a dip switch to control the conduction of different transistors to achieve overcurrent protection value adjustment, the overcurrent protection adjustment module 110 in the embodiment of the present application can also use other methods to achieve overcurrent protection value adjustment. For example, the combination of the voltage divider resistor and the transistor in the overcurrent protection adjustment module 110 can be replaced with two or more variable resistors in series, so that the overcurrent protection value can be adjusted by adjusting the resistance value of the variable resistor. This application does not impose any specific restrictions on this.

[0076] In some optional embodiments of the present application, the comparator module 120 can compare the sampling signal corresponding to the load driving module 140 with the reference signal output by the overcurrent protection adjustment module 110 through the comparator U1, so as to give different outputs according to the voltage relationship between the sampling signal and the reference signal. For example, when the voltage of the reference signal is greater than the voltage of the sampling signal, the comparator U1 outputs a high-level signal as a comparison result signal, which is transmitted to the digital signal processing module 130; and when the voltage of the reference signal is less than the voltage of the sampling signal, the comparator U1 outputs a low-level signal as a comparison result signal, which is transmitted to the digital signal processing module 130, thereby enabling the digital signal processing module 130 to output an overcurrent protection signal based on the comparison result signal to achieve overcurrent protection.

[0077] In addition, to ensure stable operation of the load, the embodiment of the present application can filter the sampling signal corresponding to the load driving module 140 through the filtering circuit unit 121 to avoid the problem of unstable load operation caused by erroneous execution of the overcurrent protection logic.

[0078] Optionally, the comparator module 120 in the embodiment of the present application may include a comparator U1 and a filtering circuit unit 121; the input end of the filtering circuit unit 121 is electrically connected to the sampling output end of the load driving module 140, and the output end of the filtering circuit unit 121 is electrically connected to the first input end of the comparator U1, so that the sampling signal can be filtered by the filtering circuit unit 121 and then transmitted to the comparator U1, and the second input end of the comparator U1 is electrically connected to the output end of the overcurrent protection adjustment module 110, so that the comparator U1 can compare the reference signal output by the overcurrent protection adjustment module 110 with the sampling signal, and output different comparison result signals according to the voltage relationship between the sampling signal and the reference signal; and the output end of the comparator U1 is electrically connected to the digital signal processing module 130, so that the comparison result signal can be output to the digital signal processing module 130 through the output end of the comparator U1, so that the digital signal processing module 130 can output an overcurrent protection signal based on the comparison result signal, execute the overcurrent protection logic, and achieve overcurrent protection.

[0079] The sampling output terminal of the load driving module 140 is used to output the sampling signal, and the output terminal of the comparator is used to output the comparison result signal.

[0080] In some optional embodiments of the present application, the filter circuit unit 121 includes a current limiting resistor R9 and a filter capacitor C3, so as to filter the sampling signal through the filter circuit composed of the current limiting resistor R9 and the filter capacitor C3 to achieve filtering and voltage stabilization power. Figure 5 As shown, the first end of the current limiting resistor R9 is electrically connected to the sampling output end of the load driving module 140, the second end of the current limiting resistor R9, the first end of the filter capacitor C3 and the first input end of the comparator U1 are electrically connected, and the second end of the filter capacitor C3 is electrically connected to the reference ground of the overcurrent protection circuit.

[0081] As an example of the present application, when the non-inverting input terminal of the comparator U1 is used as the first input terminal of the comparator U1 and the inverting input terminal of the comparator U1 is used as the second input terminal of the comparator, as shown in FIG. Figure 5As shown, the reference signal output by the overcurrent protection adjustment module 110 can be input to the comparator U1 through the non-inverting input terminal, and the sampling signal corresponding to the load driving module 140 can be transmitted to the inverting input terminal of the comparator U1 through the current limiting resistor R9 in the filter circuit unit 121, so that the comparator U1 can compare the voltage of the reference signal with the sampling signal, that is, compare the voltages of the two input terminals to give different outputs according to the relationship between the input terminal voltages. For example, when the voltage of the non-inverting input terminal is less than the voltage of the inverting input terminal, that is, when the voltage of the reference signal is less than the voltage of the sampling signal, the comparator U1 outputs a low-level signal as a comparison result signal; and when the voltage of the non-inverting input terminal is greater than the voltage of the inverting input terminal, that is, when the voltage of the reference signal is greater than the voltage of the sampling signal, the comparator U1 outputs a high-level signal as a comparison result signal, and then transmits the comparison result signal to the digital signal processing module 130, so that the digital signal processing module 130 outputs an overcurrent protection signal according to the comparison result signal to achieve overcurrent protection.

[0082] In addition, considering that the pulse width of the comparison result signal output by the comparator U1 is relatively short, in some optional embodiments of the present application, the comparison result signal can be delayed by a delay unit to extend the pulse width of the comparison result signal, so that the comparison result signal is easy to identify and the recognition accuracy of the comparison result signal is improved.

[0083] Optionally, the digital signal processing module 130 of the embodiment of the present application may include a delay unit and a digital signal processing unit; the input end of the delay unit is electrically connected to the output end of the comparator module 120, and the output end of the delay unit is electrically connected to the overcurrent protection end of the digital signal processing unit, so that the comparison result signal output by the comparator module 120 can pass through the delay unit and then be transmitted to the overcurrent protection end of the digital signal processing unit, thereby improving the accuracy of the digital signal processing unit in identifying the comparison result signal, which is beneficial for the digital signal processing unit to output an overcurrent protection signal based on the identified comparison result signal, and the overcurrent protection output end of the digital signal processing unit is electrically connected to the drive control end of the load driving module 140, so that the digital signal processing unit can output the overcurrent protection signal to the load driving module 140 through the overcurrent protection output end, so as to control the load driving module 140 to stop driving the load when the load is overcurrent, so as to control the load to stop running and achieve overcurrent protection.

[0084] Among them, the input end of the delay unit is used to receive the result signal of the comparison load driving module 140; the overcurrent protection output end of the digital signal processing unit is used to output the overcurrent protection signal; the overcurrent protection signal refers to the protection signal generated when the load overcurrent occurs, which can be specifically used to trigger the load driving module 140 to stop driving the load, so as to control the load to stop running and realize overcurrent protection.

[0085] For example, when the comparator outputs a narrow pulse width level signal as a comparison result signal, a 555 timer can be used as a delay unit to utilize the 555 timer to delay the comparison result signal output by the comparator, thereby extending the duration of the comparison result signal, that is, converting the narrow pulse width level into a settable wide pulse width level, and then transmitting it to the digital signal processing unit to give the comparison result signal to the digital signal processing unit, so that the digital signal processing unit responds according to the comparison result signal. For example, when the comparison result signal is a low level signal, it can be considered that no load overcurrent situation currently occurs; and when the comparison result signal is a high level signal, it can be considered that a load overcurrent situation currently occurs, and an overcurrent protection signal can be output based on the high level signal to respond to the comparison result signal, execute the overcurrent protection logic, and realize overcurrent protection.

[0086] In some optional embodiments of the present application, the load driving module 140 serves as an intelligent power module (IPM) of the load to drive the load through the power switch device in the IPM. Optionally, the load driving module 140 in the embodiment of the present application includes a sampling resistor R10, a bus capacitor 142, a rectifier bridge 141 and a power switch device G; Figure 5 As shown, the first end of the rectifier bridge 141, the first end of the bus capacitor 142, and the first end of the power switch device G are electrically connected, the second end of the rectifier bridge 141, the second end of the bus capacitor 142, and the second end of the sampling resistor R10 are electrically connected, and the first end of the sampling resistor R10, the second end of the power switch device G, and the second input end of the comparator module 120 are electrically connected. Therefore, the rectifier bridge 141 can rectify the input AC power signal and output a rectified signal to charge the bus capacitor 142 based on the rectified signal. Furthermore, based on the power stored in the bus capacitor 142, a stable DC power supply signal can be output to the power switch device G to power the power switch device G and ensure that the power switch device G can operate normally. In addition, the control end of the power switch device G is used to receive the overcurrent protection signal, so that the power switch device G can be disconnected under the control of the overcurrent protection signal, thereby causing the load driving module 140 to stop outputting the drive signal to the load, thereby stopping driving the load.

[0087] The power switch device G is used to drive the load; the bus capacitor refers to the capacitor connected to the DC bus, which may specifically include one or more capacitors. For example, the bus capacitor may include a first capacitor C1 and a second capacitor C2 connected to the DC bus. Figure 5 shown.

[0088] In a specific implementation, the overcurrent protection circuit provided in the embodiment of the present application can be applied to a driver board as an overcurrent protection circuit of the driver board, so that the driver board can adjust the overcurrent protection value through the overcurrent protection adjustment module 110 to achieve overcurrent protection value adjustment, thereby making the driver board more flexible in application, solving the problem in the existing related technology that the driver board is incompatible with different loads due to the fixed overcurrent protection value, and improving the compatibility of the driver board while achieving overcurrent protection.

[0089] As an example of the present application, the overcurrent protection function of the driver board can be implemented based on the overcurrent protection circuit provided in the embodiment of the present application, so that the driver board can set different overcurrent protection values ​​as needed, so that one driver board can be compatible with multiple loads, that is, the same model of driver board can be used to correspond to multiple loads, thereby streamlining accessories and simplifying production and after-sales processes.

[0090] For example, when the comparator's non-inverting input is connected to some voltage divider resistors, such as Figure 5 As shown in the figure, these voltage divider resistors include voltage divider resistor R3, voltage divider resistor R4, voltage divider resistor R5, voltage divider resistor R6, voltage divider resistor R7, and voltage divider resistor R8, and each of these voltage divider resistors is connected in series with a transistor to control whether the voltage divider resistor is connected or not, so that the overcurrent protection value can be adjusted by controlling the conduction of the transistor. Specifically, by switching different transistors, 49 different resistor combinations can be theoretically matched, such as Figure 6 As shown, the overcurrent protection adjustment module 110 can adjust the overcurrent protection value according to the adjustment control signal corresponding to the load, output the corresponding 49 different level signals, and transmit them to the comparator non-inverting input terminal as a reference signal to achieve compatibility of multiple overcurrent protection values.

[0091] Among them, the combination of voltage divider resistors and transistors is not limited to Figure 5 The configuration shown can be freely selected according to needs, and the embodiments of the present application are not limited to this.

[0092] like Figure 7As shown, the embodiment of the present application provides a driving device 700, including an overcurrent protection circuit 710 of a driving board. The overcurrent protection circuit 710 can be the overcurrent protection circuit described in any embodiment of the present application, so that the driving device can adjust the overcurrent protection value through the overcurrent protection adjustment module 110, thereby realizing the overcurrent protection value adjustment, through the output end of the overcurrent protection adjustment module 110 being electrically connected to the first input end of the comparator module 120, the second input end of the comparator module 120 being electrically connected to the sampling output end of the load driving module 140, and the output end of the comparator module 120 being electrically connected to the sampling output end of the digital signal processing module 140. The input end of the processing module 130 is electrically connected, so that the comparator module 120 can compare the reference signal output by the overcurrent protection adjustment module 110 with the sampling signal corresponding to the load driving module 140, and output the comparison result signal to the digital signal processing module 130, so that the digital signal processing module 130 outputs the overcurrent protection signal according to the comparison result signal, so as to trigger the load driving module 140 to stop driving the load through the overcurrent protection signal, thereby realizing overcurrent protection, thereby solving the problem of poor compatibility caused by the fixed overcurrent protection value in the existing related technology and improving the compatibility of the driving device.

[0093] In a specific implementation, the above-mentioned driving device can be integrated into the driving board of the electrical equipment, so that the driving board can adjust the overcurrent protection value through the overcurrent protection adjustment module 110 to realize overcurrent protection value adjustment, and the reference signal output by the overcurrent protection adjustment module 110 can be compared with the sampling signal corresponding to the load driving module 140 through the comparator module 120, and the comparison result signal is output to the digital signal processing module 130, so that the digital signal processing module 130 outputs the overcurrent protection signal according to the comparison result signal, so as to trigger the load driving module 140 to stop driving the load through the overcurrent protection signal to realize overcurrent protection, thereby solving the problem of poor compatibility caused by the use of a fixed overcurrent protection value by the driving board in the existing related technology, and improving the compatibility of the driving board.

[0094] like Figure 8 As shown, an embodiment of the present application also provides an electrical device 801, the driving board 802 of the electrical device 801 includes the overcurrent protection circuit 710 in any of the above embodiments, so that the electrical device can adjust the overcurrent protection value through the overcurrent protection adjustment module 110 in the driving board to achieve overcurrent protection value adjustment, and can compare the reference signal output by the overcurrent protection adjustment module 110 with the sampling signal corresponding to the load driving module 140 through the comparator module 120, and output the comparison result signal to the digital signal processing module 130, so that the digital signal processing module 130 outputs the overcurrent protection signal according to the comparison result signal, so as to trigger the load driving module 140 to stop driving the load through the overcurrent protection signal, thereby achieving overcurrent protection and ensuring the safety of the user device.

[0095] In specific implementations, the electrical equipment in the embodiments of the present application may include but is not limited to refrigeration electronic equipment such as air conditioners and refrigerators, and may also include small electronic equipment such as fans, washing machines and other small electronic equipment. The embodiments of the present application do not impose specific restrictions on this.

[0096] The apparatus and device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0097] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, and of course can also be implemented by hardware.

[0098] Based on this understanding, the above technical solution can essentially or the part that contributes to the relevant technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0099] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0100] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but rather to be construed in the broadest manner consistent with the principles and novel features claimed herein.

Claims

1. An overcurrent protection circuit, characterized in that: include: Overcurrent protection regulation module, comparator module, digital signal processing module and load driving module; The output end of the overcurrent protection adjustment module is electrically connected to the first input end of the comparator module, the second input end of the comparator module is electrically connected to the sampling output end of the load driving module, the output end of the comparator module is electrically connected to the input end of the digital signal processing module, and the output end of the digital signal processing module is electrically connected to the driving control end of the load driving module; The overcurrent protection adjustment module is used to adjust the overcurrent protection value according to the adjustment control signal corresponding to the load, and output a reference signal corresponding to the overcurrent protection value; The comparator module is configured to compare the reference signal with the sampling signal corresponding to the load driving module and output a comparison result signal; The digital signal processing module is used to output an overcurrent protection signal according to the comparison result signal, and the overcurrent protection signal is used to trigger the load driving module to stop driving the load.

2. The overcurrent protection circuit according to claim 1, characterized in that: The overcurrent protection adjustment module includes: a resistor voltage dividing unit, at least two adjustment output units and a switch control unit; The switch control unit includes control switches connected to the adjustment output units in a one-to-one correspondence, a first end of each control switch is electrically connected to the output end of the resistance voltage divider unit, and a second end of each control switch is electrically connected to the control input end of the target adjustment output unit, and the target adjustment output unit is the adjustment output unit correspondingly connected to the control switch; The output terminal of the adjustment output unit is electrically connected to the first input terminal of the comparator module; The regulation control signal is used to control the switching state of each control switch in the switch control unit, and the output end of the regulation output unit is used to output the reference signal.

3. The overcurrent protection circuit according to claim 2, characterized in that: The resistance voltage dividing unit includes a first resistor and a second resistor; The first end of the first resistor is electrically connected to the first power supply end of the overcurrent protection circuit, the second end of the first resistor, the second end of the second resistor and the first end of the control switch are electrically connected, and the second end of the second resistor is electrically connected to the reference ground of the overcurrent protection circuit.

4. The overcurrent protection circuit according to claim 2, wherein: Each of the regulating output units comprises a transistor and a voltage dividing resistor; The first end of the transistor is electrically connected to the second power supply end of the overcurrent protection circuit through the voltage-dividing resistor, the second end of the transistor is electrically connected to the first input end of the comparator module, and the control end of the transistor is electrically connected to the second end of the target control switch, and the target control switch is a control switch corresponding to the transistor.

5. The overcurrent protection circuit according to claim 2, wherein: Each of the regulating output units comprises a transistor and a voltage dividing resistor; The first end of the transistor is electrically connected to the second power supply end of the overcurrent protection circuit, the second end of the transistor is electrically connected to the first input end of the comparator module through the voltage divider resistor, and the control end of the transistor is electrically connected to the second end of the target control switch, and the target control switch is a control switch corresponding to the transistor.

6. The overcurrent protection circuit according to claim 1, wherein: The comparator module includes a comparator and a filter circuit unit; The input end of the filter circuit unit is electrically connected to the sampling output end of the load driving module, the output end of the filter circuit unit is electrically connected to the first input end of the comparator, the second input end of the comparator is electrically connected to the output end of the overcurrent protection adjustment module, the output end of the comparator is electrically connected to the digital signal processing module, the sampling output end of the load driving module is used to output the sampling signal, and the output end of the comparator is used to output the comparison result signal.

7. The overcurrent protection circuit according to claim 6, characterized in that: The filter circuit unit includes a current limiting resistor and a filter capacitor; The first end of the current limiting resistor is electrically connected to the sampling output end of the load driving module, the second end of the current limiting resistor, the first end of the filter capacitor and the first input end of the comparator are electrically connected, and the second end of the filter capacitor is electrically connected to the reference ground of the overcurrent protection circuit.

8. The overcurrent protection circuit according to claim 1, wherein: The digital signal processing module includes a delay unit and a digital signal processing unit; The input end of the delay unit is electrically connected to the output end of the comparator module, the output end of the delay unit is electrically connected to the overcurrent protection end of the digital signal processing unit, the overcurrent protection output end of the digital signal processing unit is electrically connected to the drive control end of the load driving module, the input end of the delay unit is used to receive the comparison result signal, and the overcurrent protection output end of the digital signal processing unit is used to output the overcurrent protection signal.

9. The overcurrent protection circuit according to any one of claims 1 to 8, characterized in that: The load driving module includes a sampling resistor, a bus capacitor, a rectifier bridge and a power switch device; The first end of the rectifier bridge, the first end of the bus capacitor, and the first end of the power switching device are electrically connected; the second end of the rectifier bridge, the second end of the bus capacitor, and the second end of the sampling resistor are electrically connected; the first end of the sampling resistor, the second end of the power switching device, and the second input end of the comparator module are electrically connected; the control end of the power switching device is used to receive the overcurrent protection signal; and the power switching device is used to drive the load.

10. A driving device, characterized in that: The invention comprises the overcurrent protection circuit as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: The driving board of the electrical device includes the overcurrent protection circuit as described in any one of claims 1 to 9.

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