CN111740381B - Switching power supply circuit, air conditioning equipment and refrigerator - Google Patents
Switching power supply circuit, air conditioning equipment and refrigerator Download PDFInfo
- Publication number
- CN111740381B CN111740381B CN202010661064.1A CN202010661064A CN111740381B CN 111740381 B CN111740381 B CN 111740381B CN 202010661064 A CN202010661064 A CN 202010661064A CN 111740381 B CN111740381 B CN 111740381B
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- power supply
- capacitor
- switching power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
Abstract
A switching power supply circuit, air conditioning equipment and a refrigerator comprise a driving circuit, a switching power supply module, a detection circuit and an overcurrent protection circuit; when the driving circuit is accessed to the control signal, the driving circuit generates a driving signal according to the control signal; the switching power supply module converts the input voltage according to the driving signal to output a working voltage; the working voltage is used for driving a load; the detection circuit detects the main switch conduction current of the switching power supply module to generate a detection current; the overcurrent protection circuit compares the detection current with a threshold current and generates a disabling signal according to a comparison result; the driving circuit stops generating driving signals according to the disabling signals so as to enable the switching power supply module to stop generating main switch conducting current and working voltage; therefore, the hardware overcurrent protection of the load is realized.
Description
Technical Field
The application belongs to the field of power supplies, and particularly relates to a switching power supply circuit, air conditioning equipment and a refrigerator.
Background
In the existing electronic products, semiconductor devices are widely used, and one of the most remarkable characteristics of the semiconductor devices is that the semiconductor devices are obviously heated under the condition of large current, so that the temperature of components is sharply increased, and the long-time operation under the high-temperature condition not only can reduce the service life of the semiconductor devices, but also can greatly reduce the operation reliability of the electronic products. Therefore, heat dissipation of heat-generating electronic products needs to be considered. The temperature of the heating electronic product is controlled to a certain range, and a direct current fan is usually adopted for air cooling and heat dissipation. Because electronic products are various in types and application occasions are different, in some severe environments, the direct current fan may be blocked and overloaded to cause overcurrent to burn out the direct current fan, and therefore overcurrent protection of the direct current fan is very important.
Disclosure of Invention
An object of the application is to provide a switching power supply circuit, air conditioning equipment and refrigerator, aim at solving the unable problem of carrying on overcurrent protection that traditional switching power supply circuit exists.
The embodiment of the application provides a switching power supply circuit, includes:
the driving circuit is configured to generate a driving signal according to the control signal when the control signal is switched in;
the switching power supply module is connected with the driving circuit and is configured to convert input voltage according to a driving signal so as to output working voltage; the working voltage is used for driving a load;
the detection circuit is connected with the switching power supply module and is configured to detect the conduction current of a main switch of the switching power supply module so as to generate a detection current;
the overcurrent protection circuit is connected with the detection circuit and the drive circuit and is configured to compare the detection current with a threshold current and generate an incapability signal according to a comparison result;
the driving circuit is further configured to stop generating a driving signal according to the disable signal to stop the switching power supply module from generating the main switch conducting current and the working voltage.
In one embodiment, the switching power supply circuit further includes:
and the control circuit is connected with the drive circuit and is configured to output the control signal when the disabling signal is not accessed, and stop outputting the control signal when the disabling signal is accessed.
In one embodiment, the control circuit comprises a microprocessor;
the first data input and output end of the microprocessor is a control signal output end of the control circuit, and the second data input and output end of the microprocessor is a disabling signal input end of the control circuit.
In one embodiment, the driving circuit comprises a driving chip, a first diode, a second diode, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor;
the negative electrode input end of the channel A of the driving chip is connected with the first end of the fourth resistor, the positive electrode input end of the channel A of the driving chip is connected with the first end of the second resistor, the first end of the first resistor and the positive electrode of the first diode, the negative electrode of the first diode is the disabling signal input end of the driving circuit, the second end of the first resistor is the control signal input end of the driving circuit, the negative electrode input end of the channel B of the driving chip is connected with the first end of the third resistor, the power end of the driving chip and the first end of the first capacitor are connected to a first power supply in common, the output end of the channel A of the driving chip is connected with the negative electrode of the second diode and the first end of the fifth resistor, the positive electrode of the second diode and the second end of the fifth resistor jointly form the driving signal output end of the driving circuit, the ground terminal of the driving chip, the second end of the fourth resistor, the second end of the second resistor, the second end of the third resistor and the second end of the first capacitor are connected to a power ground in common.
In one embodiment, the detection circuit comprises a second capacitor, a seventh resistor and an eighth resistor;
the first end of the seventh resistor and the first end of the eighth resistor jointly form a main switch conduction current input end of the detection circuit, the second end of the eighth resistor and the first end of the second capacitor jointly form a detection current output end of the detection circuit, and the second end of the seventh resistor and the second end of the second capacitor are connected to a power ground in common.
In one embodiment, the switching power supply module is a chopper circuit.
In one embodiment, the chopper circuit comprises a first field effect transistor, a voltage regulator tube, a first inductor, a third diode, a third capacitor and a sixth resistor;
the negative electrode of the voltage regulator tube, the negative electrode of the third diode and the first end of the third capacitor jointly form an input direct current input end of the chopper circuit and an anode output end of working voltage of the chopper circuit, the first end of the first inductor, the anode of the third diode and the second end of the third capacitor jointly form a negative electrode output end of the working voltage of the chopper circuit, the second end of the first inductor is connected with the anode of the third diode and the drain electrode of the first field-effect tube, the first end of the sixth resistor and the gate electrode of the first field-effect tube jointly form a driving signal input end of the chopper circuit, and the source electrode of the first field-effect tube and the second end of the sixth resistor are main switch conduction current output ends of the chopper circuit.
In one embodiment, the overcurrent protection circuit comprises a comparator, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a thirteenth resistor;
a positive-phase input end of the comparator is connected with a first end of the fifth capacitor, a first end of the sixth capacitor, a first end of the tenth resistor and a first end of the twelfth resistor, an inverted-phase input end of the comparator is connected with a first end of the seventh capacitor, a second end of the sixth capacitor, a first end of the eleventh resistor and a first end of the thirteenth resistor, a second end of the thirteenth resistor is a detection current input end of the over-current protection circuit, an output end of the comparator and a first end of the ninth resistor jointly form an disable signal output end of the over-current protection circuit, a power supply end of the comparator, a second end of the ninth resistor, a first end of the fourth capacitor, a second end of the tenth resistor and a second end of the eleventh resistor are commonly connected to a second power supply, a ground end of the comparator, a positive-phase input end of the comparator, a first end of the sixth capacitor, a first end of the tenth resistor and a first end of the twelfth resistor are connected to a first end of the thirteenth resistor, a second end of the over-current protection circuit is connected to a second power supply terminal of the comparator, and a second power supply terminal of the comparator, The second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the seventh capacitor and the second end of the twelfth resistor are connected to a power ground in common.
The embodiment of the invention also provides air conditioning equipment which comprises the switching power supply circuit.
The embodiment of the invention also provides a refrigerator which comprises the switching power supply circuit.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the switch power supply circuit monitors the main switch breakover current of the switch power supply module in real time through the detection circuit to generate the detection current, the overcurrent protection circuit compares the detection current with the threshold current, and when the detection current is greater than the set threshold current, the overcurrent protection circuit starts protection action, so that the switch power supply circuit stops outputting working voltage to a load, the load is protected and shut down, and the hardware overcurrent protection of the load is realized.
Drawings
In order to more clearly illustrate the technical invention in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced, it is obvious that the drawings in the description below are only some embodiments of the present invention, and other drawings may be obtained by those skilled in the art without inventive efforts.
Fig. 1 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a switching power supply circuit according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of an example of a switching power supply circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings to facilitate the description of the application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be constructed in operation as a limitation of the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic structural diagram of a switching power supply circuit provided in a preferred embodiment of the present application, and for convenience of description, only the parts related to this embodiment are shown, and the details are as follows:
the switching power supply circuit comprises a driving circuit 11, a switching power supply module 12, a detection circuit 13 and an overcurrent protection circuit 14.
The driving circuit 11 is configured to generate a driving signal according to the control signal when the control signal is switched in; the switching power supply module 12 is connected to the driving circuit 11, and configured to convert an input voltage according to a driving signal to output a working voltage; the working voltage is used for driving a load; the detection circuit 13 is connected to the switching power supply module 12 and configured to detect a main switch on current of the switching power supply module 12 to generate a detection current; the overcurrent protection circuit 14 is connected with the detection circuit 13 and the drive circuit 11, and is configured to compare the detection current with the threshold current and generate an disable signal according to the comparison result; the driving circuit 11 is further configured to stop generating the driving signal according to the disable signal to stop the switching power supply module 12 from generating the main switch on current and the operating voltage.
The switching power supply module 12 may be a chopper circuit configured to perform high-frequency chopping on the input voltage according to the driving signal to generate a main switch conduction current and a working voltage.
As shown in fig. 2, the switching power supply circuit further includes a control circuit 15.
The driver circuit 11 is connected to output a control signal when the disable signal is not input, and stops outputting the control signal when the disable signal is input.
When the hardware overcurrent protection is performed on the load 16, the disabling signal is input to the control circuit 15, and the control circuit 15 stops outputting the control signal after receiving the disabling signal, so that the software overcurrent protection of the load 16 is realized. Hardware overcurrent protection and software overcurrent protection actions almost occur at the same time, but because the software overcurrent protection needs the control circuit 15 to receive the disabling signal and send out the software protection action after processing the disabling signal, the hardware overcurrent protection action is faster than the software protection action, and is more efficient and more reliable, but the software overcurrent protection can avoid the problem of ground overcurrent protection failure caused by the fault of the overcurrent protection circuit 14.
As shown in fig. 3, the switching power supply circuit is also connected to a load 16.
The load 16 is configured to operate according to an operating voltage.
Specifically, the load 16 may be a dc motor.
Fig. 4 shows an exemplary circuit structure of a switching power supply circuit provided in an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
the driving circuit 11 includes a driving chip U1, a first diode D1, a second diode D2, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.
The A-channel cathode input terminal INA-of the driving chip U1 is connected to the first terminal of the fourth resistor R4, the A-channel anode input terminal INA + of the driving chip U1 is connected to the first terminal of the second resistor R2, the first terminal of the first resistor R1 and the anode of the first diode D1, the cathode of the first diode D1 is the disable signal input terminal of the driving circuit 11, the second terminal of the first resistor R1 is the control signal input terminal of the driving circuit 11, the B-channel cathode input terminal INB-of the driving chip U1 is connected to the first terminal of the third resistor R3, the power supply VDD of the driving chip U1 and the first terminal of the first capacitor C1 are connected to the first power supply VP in common, the A-channel output terminal OUTA of the driving chip U1 is connected to the cathode of the second diode D2 and the first terminal of the fifth resistor R5, the anode of the second diode D2 and the second terminal of the fifth resistor R5 form the driving signal output terminal of the driving circuit 11, the ground GND of the driving chip U1, the second terminal of the fourth resistor R4, the second terminal of the second resistor R2, the second terminal of the third resistor R3, and the second terminal of the first capacitor C1 are commonly connected to the power ground.
The detection circuit 13 includes a second capacitor C2, a seventh resistor R7, and an eighth resistor R8.
A first end of the seventh resistor R7 and a first end of the eighth resistor R8 jointly form a main switch conduction current input end of the detection circuit 13, a second end of the eighth resistor R8 and a first end of the second capacitor C2 jointly form a detection current output end of the detection circuit 13, and a second end of the seventh resistor R7 and a second end of the second capacitor C2 are jointly connected to the power ground.
The chopper circuit 12 includes a first field effect transistor Q1, a voltage regulator DZ1, a first inductor L1, a third diode D3, a third capacitor C3, and a sixth resistor R6.
The negative electrode of the voltage regulator tube DZ1, the negative electrode of the third diode D3 and the first end of the third capacitor C3 jointly form an input direct current input end of the chopper circuit 12 and a positive electrode output end of the working voltage of the chopper circuit 12, the first end of the first inductor L1, the positive electrode of the third diode D3 and the second end of the third capacitor C3 jointly form a negative electrode output end of the working voltage of the chopper circuit 12, the second end of the first inductor L1 is connected with the positive electrode of the third diode D3 and the drain electrode of the first field-effect tube Q1, the first end of the sixth resistor R6 and the gate electrode of the first field-effect tube Q1 jointly form a driving signal input end of the chopper circuit 12, and the source electrode of the first field-effect tube Q1 and the second end of the sixth resistor R6 are main switching current output ends of the chopper circuit 12.
The over-current protection circuit 14 includes a comparator U2, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13.
A non-inverting input terminal of the comparator U2 is connected to a first terminal of the fifth capacitor C5, a first terminal of the sixth capacitor C6, a first terminal of the tenth resistor R10, and a first terminal of the twelfth resistor R12, an inverting input terminal of the comparator U2 is connected to a first terminal of the seventh capacitor C7, a second terminal of the sixth capacitor C6, a first terminal of the eleventh resistor R11, and a first terminal of the thirteenth resistor R13, a second terminal of the thirteenth resistor R13 is a detection current input terminal of the overcurrent protection circuit 14, an output terminal of the comparator U2 and a first terminal of the ninth resistor R9 jointly form a disable signal output terminal of the overcurrent protection circuit 14, a power supply terminal of the comparator U2, a second terminal of the ninth resistor R9, a first terminal of the fourth capacitor C4, a second terminal of the tenth resistor R10, and a second terminal of the eleventh resistor R11 are jointly connected to a second power supply, a ground terminal of the comparator U VCC 42, a second terminal of the fourth capacitor C4, a second terminal of the fourth capacitor C5, and a second terminal of the fifth capacitor R5 are jointly connected to a second power supply terminal of the second power supply 3984, The second terminal of the seventh capacitor C7 and the second terminal of the twelfth resistor R12 are connected to the power ground.
The control circuit 15 includes a microprocessor U3.
The first data input/output terminal P1.0 of the microprocessor U3 is a control signal output terminal of the control circuit 15, and the second data input/output terminal P2.0 of the microprocessor U3 is a disable signal input terminal of the control circuit 15.
The description of fig. 4 is further described below in conjunction with the working principle:
a first data input and output end P1.0 of the microprocessor U3 outputs a control signal to an a-channel positive input end INA + of a driving chip U1, the driving chip U1 generates a driving signal with a preset duty ratio according to the control signal and outputs the driving signal to a gate of a first field-effect transistor Q1, a chopper circuit 12 composed of the first field-effect transistor Q1, a voltage regulator DZ1, a first inductor L1, a third diode D3 and a third capacitor C3 performs high-frequency chopping on an input voltage (input direct current) according to the driving signal and generates a working voltage, and the working voltage is output to a load 16 from a positive output end (a negative electrode of the voltage regulator DZ1, a negative electrode of the third diode D3 and a first end of the third capacitor C3) of the working voltage and a negative output end (a first end of the first inductor L1, a positive electrode of the third diode D3 and a second end of the third capacitor C3) of the working voltage, so that the load 16 operates; meanwhile, the chopper circuit 12 also generates a main switch conducting current to be output from a source electrode of a first field effect transistor Q1, a resistance-capacitance network consisting of a second capacitor C2, a seventh resistor R7 and an eighth resistor R8 detects the main switch conducting current and generates a detection current, the detection current is input to an inverting input end of a comparator U2, the resistance value of a tenth resistor R10, the resistance value of an eleventh resistor R11, the resistance value of a twelfth resistor R12 and the resistance value of a thirteenth resistor R13 are set to set the threshold current of current protection, when the detection circuit 13 received by the comparator U2 is larger than the set threshold current, the voltage of a negative input end of the comparator U2 is larger than the voltage of a positive input end of a comparator U2, the comparator U2 outputs a low level, an A + of an A channel positive input end of a driving chip U2 is forcibly pulled down through a first diode 35D 1 to be disabled, and the driving chip U1 stops outputting a driving voltage, the first fet Q1 is turned off, the chopper circuit 12 stops working, and thus stops outputting working voltage to the load 16 (such as a dc fan), the load 16 is protected and stopped, and at the same time, the second data input/output terminal P2.0 of the microprocessor U3 is also pulled low, and the low level signal is regarded as a fault signal, and the microprocessor U3 stops outputting a control signal to the driver chip after receiving the disable signal, and releases internal resources of the microprocessor U3.
The second diode D2 is used to provide a fast current leakage loop for the first fet Q1 when the first fet Q1 is turned off.
The embodiment of the invention also provides air conditioning equipment which comprises the switching power supply circuit.
The embodiment of the invention also provides a refrigerator which comprises the switching power supply circuit.
The embodiment of the invention comprises a driving circuit, a switching power supply module, a detection circuit and an overcurrent protection circuit; when the driving circuit is accessed to the control signal, the driving circuit generates a driving signal according to the control signal; the switching power supply module converts the input voltage according to the driving signal to output a working voltage; the working voltage is used for driving a load; the detection circuit detects the main switch conduction current of the switching power supply module to generate a detection current; the overcurrent protection circuit compares the detection current with a threshold current and generates a disabling signal according to a comparison result; the driving circuit stops generating driving signals according to the disabling signals so that the switching power supply module stops generating main switch conducting current and working voltage; the detection circuit monitors the main switch conduction current of the switching power supply module in real time to generate detection current, the overcurrent protection circuit compares the detection current with the threshold current, and when the detection current is greater than the set threshold current, the overcurrent protection circuit starts protection action, so that the switching power supply circuit stops outputting working voltage to the load, the load is protected and shut down, and the hardware overcurrent protection of the load is realized.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (8)
1. A switching power supply circuit, comprising:
the driving circuit is configured to generate a driving signal according to the control signal when the control signal is switched in;
the switching power supply module is connected with the driving circuit and is configured to convert input voltage according to a driving signal so as to output working voltage; the working voltage is used for driving a load;
the detection circuit is connected with the switching power supply module and is configured to detect a main switch conduction current of the switching power supply module to generate a detection current;
the overcurrent protection circuit is connected with the detection circuit and the drive circuit and is configured to compare the detection current with a threshold current and generate an incapability signal according to a comparison result;
the driving circuit is further configured to stop generating a driving signal according to the disable signal to stop the switching power supply module from generating the main switch conducting current and the working voltage;
the switching power supply module is a chopper circuit;
the chopper circuit comprises a first field effect transistor, a voltage regulator tube, a first inductor, a third diode, a third capacitor and a sixth resistor;
the negative electrode of the voltage regulator tube, the negative electrode of the third diode and the first end of the third capacitor jointly form an input direct current input end of the chopper circuit and an anode output end of working voltage of the chopper circuit, the first end of the first inductor, the anode of the third diode and the second end of the third capacitor jointly form a negative electrode output end of the working voltage of the chopper circuit, the second end of the first inductor is connected with the anode of the third diode and the drain electrode of the first field-effect tube, the first end of the sixth resistor and the gate electrode of the first field-effect tube jointly form a driving signal input end of the chopper circuit, and the source electrode of the first field-effect tube and the second end of the sixth resistor are main switch conduction current output ends of the chopper circuit.
2. The switching power supply circuit according to claim 1, wherein the switching power supply circuit further comprises:
and the control circuit is connected with the drive circuit and is configured to output the control signal when the disabling signal is not accessed, and stop outputting the control signal when the disabling signal is accessed.
3. The switching power supply circuit according to claim 2, wherein the control circuit includes a microprocessor;
the first data input and output end of the microprocessor is a control signal output end of the control circuit, and the second data input and output end of the microprocessor is a disable signal input end of the control circuit.
4. The switching power supply circuit according to claim 1, wherein the driving circuit includes a driving chip, a first diode, a second diode, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;
the negative electrode input end of the channel A of the driving chip is connected with the first end of the fourth resistor, the positive electrode input end of the channel A of the driving chip is connected with the first end of the second resistor, the first end of the first resistor and the positive electrode of the first diode, the negative electrode of the first diode is the disabling signal input end of the driving circuit, the second end of the first resistor is the control signal input end of the driving circuit, the negative electrode input end of the channel B of the driving chip is connected with the first end of the third resistor, the power end of the driving chip and the first end of the first capacitor are connected to a first power supply in common, the output end of the channel A of the driving chip is connected with the negative electrode of the second diode and the first end of the fifth resistor, the positive electrode of the second diode and the second end of the fifth resistor jointly form the driving signal output end of the driving circuit, the ground terminal of the driving chip, the second end of the fourth resistor, the second end of the second resistor, the second end of the third resistor and the second end of the first capacitor are connected to a power ground in common.
5. The switching power supply circuit according to claim 1, wherein the detection circuit includes a second capacitor, a seventh resistor, and an eighth resistor;
the first end of the seventh resistor and the first end of the eighth resistor jointly form a main switch conduction current input end of the detection circuit, the second end of the eighth resistor and the first end of the second capacitor jointly form a detection current output end of the detection circuit, and the second end of the seventh resistor and the second end of the second capacitor are connected to a power ground in common.
6. The switching power supply circuit according to claim 1, wherein the overcurrent protection circuit includes a comparator, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor;
a positive-phase input end of the comparator is connected with a first end of the fifth capacitor, a first end of the sixth capacitor, a first end of the tenth resistor and a first end of the twelfth resistor, an inverted-phase input end of the comparator is connected with a first end of the seventh capacitor, a second end of the sixth capacitor, a first end of the eleventh resistor and a first end of the thirteenth resistor, a second end of the thirteenth resistor is a detection current input end of the over-current protection circuit, an output end of the comparator and a first end of the ninth resistor jointly form an disable signal output end of the over-current protection circuit, a power supply end of the comparator, a second end of the ninth resistor, a first end of the fourth capacitor, a second end of the tenth resistor and a second end of the eleventh resistor are commonly connected to a second power supply, a ground end of the comparator, a positive-phase input end of the comparator, a first end of the sixth capacitor, a first end of the tenth resistor and a first end of the twelfth resistor are connected to a first end of the thirteenth resistor, a second end of the over-current protection circuit is connected to a second power supply terminal of the comparator, and a second power supply terminal of the comparator, The second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the seventh capacitor and the second end of the twelfth resistor are connected to a power ground in common.
7. An air conditioning apparatus characterized by comprising the switching power supply circuit according to any one of claims 1 to 6.
8. A refrigerator characterized in that it comprises a switching power supply circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010661064.1A CN111740381B (en) | 2020-07-10 | 2020-07-10 | Switching power supply circuit, air conditioning equipment and refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010661064.1A CN111740381B (en) | 2020-07-10 | 2020-07-10 | Switching power supply circuit, air conditioning equipment and refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111740381A CN111740381A (en) | 2020-10-02 |
| CN111740381B true CN111740381B (en) | 2022-08-19 |
Family
ID=72654273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010661064.1A Active CN111740381B (en) | 2020-07-10 | 2020-07-10 | Switching power supply circuit, air conditioning equipment and refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111740381B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701662B (en) * | 2020-12-11 | 2023-02-21 | 深圳市英威腾电气股份有限公司 | Overvoltage protection circuit, switching power supply circuit, and power supply device |
| CN115800189B (en) * | 2023-01-09 | 2023-05-02 | 上海海栎创科技股份有限公司 | On-chip overcurrent protection circuit and protection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010124614A (en) * | 2008-11-20 | 2010-06-03 | Cosel Co Ltd | Switching power supply unit |
| JP2012249499A (en) * | 2011-05-31 | 2012-12-13 | Nichicon Corp | Switching power supply device |
| CN108718152A (en) * | 2018-06-13 | 2018-10-30 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN208707299U (en) * | 2018-09-30 | 2019-04-05 | 广东美芝制冷设备有限公司 | The overcurrent protective device and electric system and equipment of motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8385029B2 (en) * | 2009-09-10 | 2013-02-26 | Polar Semiconductor, Inc. | Over-current protection device for a switched-mode power supply |
-
2020
- 2020-07-10 CN CN202010661064.1A patent/CN111740381B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010124614A (en) * | 2008-11-20 | 2010-06-03 | Cosel Co Ltd | Switching power supply unit |
| JP2012249499A (en) * | 2011-05-31 | 2012-12-13 | Nichicon Corp | Switching power supply device |
| CN108718152A (en) * | 2018-06-13 | 2018-10-30 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN208707299U (en) * | 2018-09-30 | 2019-04-05 | 广东美芝制冷设备有限公司 | The overcurrent protective device and electric system and equipment of motor |
Non-Patent Citations (1)
| Title |
|---|
| 丁立文.一种电流模式PWM开关电源控制器的设计.《中国优秀硕士学位论文全文数据库 电子期刊 信息科技辑》.2018,(第2期),1136-152 第59-65页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111740381A (en) | 2020-10-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111740381B (en) | Switching power supply circuit, air conditioning equipment and refrigerator | |
| US20130077195A1 (en) | Electrostatic discharge protection circuit for an integrated circuit | |
| WO2020238864A1 (en) | Overvoltage protection circuit | |
| CN109510176B (en) | Intelligent power module driving protection circuit | |
| CN111162510A (en) | Load driving circuit with quick protection function and protection method thereof | |
| CN114977753A (en) | Active clamping method, circuit and power conversion equipment | |
| CN216086603U (en) | Inductive load switch tube protection circuit | |
| CN116316436A (en) | Motor driving circuit and electronic equipment | |
| CN112181885B (en) | Hot plug circuit, mainboard and server system | |
| CN110518543B (en) | Short-circuit protection circuit and power supply system | |
| CN112865520A (en) | Switching tube protection circuit and switching device | |
| CN113131436A (en) | Overvoltage protection circuit, overvoltage protection device and electronic equipment | |
| CN113285587A (en) | Protection device of PFC circuit, control method thereof and motor system | |
| CN112068614A (en) | Temperature control heat dissipation circuit and electronic equipment | |
| US20140362485A1 (en) | Transient Protection Filter Circuit that Minimizes the Effects of Thermal Runaway | |
| CN215990180U (en) | Switch protection circuit and device | |
| CN109962697A (en) | For operating the method for transistor device and with the electronic circuit of transistor device | |
| CN113675939B (en) | Low-loss internal and external power supply seamless switching circuit | |
| CN215186464U (en) | Switching tube protection circuit and switching device | |
| CN219498943U (en) | Low side switch protection circuit | |
| CN218734246U (en) | Overvoltage protection circuit and power equipment | |
| CN214707134U (en) | Overvoltage protection circuit, overvoltage protection device and electronic equipment | |
| CN217849266U (en) | Double-circuit direct current Motor driving circuit | |
| CN215072144U (en) | Protection device and motor system of PFC circuit | |
| CN117318684B (en) | Shutdown circuit and electronic device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |