CN217824228U - Overcurrent protection circuit, switching power supply circuit, computer board and air conditioner - Google Patents
Overcurrent protection circuit, switching power supply circuit, computer board and air conditioner Download PDFInfo
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Abstract
The application relates to the technical field of overcurrent protection circuits, and discloses an overcurrent protection circuit, which comprises: the power supply module is used for supplying power to a load through a switch end of the relay; the current sampling module is electrically connected with the power supply module. The current sampling module is used for sampling current of the power supply module. The control signal input end of the relay is electrically connected with the overcurrent detection control module; the overcurrent detection control module is electrically connected with the current sampling module; the overcurrent detection control module is used for outputting a control signal to the relay according to the current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the current signal output by the current sampling module so as to disconnect the power supply module from the load. Further, the possibility of the circuit being burned out can be reduced when an overcurrent is generated in the circuit. The application also discloses a switching power supply circuit, a computer board and an air conditioner.
Description
Technical Field
The application relates to the technical field of overcurrent protection circuits, for example to an overcurrent protection circuit, a switching power supply circuit, a computer board and an air conditioner.
Background
The power supply is often over-current or short-circuited due to load damage, the fuse tube and the direct current voltage stabilizing circuit are burnt if the power supply is in a light state, and a higher rectified voltage is connected in series to the load due to the damage of the direct current voltage stabilizing circuit, so that more expensive circuit modules are burnt. Therefore, it is necessary to solve the problem of reducing the possibility of the circuit being burned when an over-current is generated in the circuit.
SUMMERY OF THE UTILITY MODEL
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides an overcurrent protection circuit, a switching power supply circuit, a computer board and an air conditioner, so that the probability of circuit burnout can be reduced under the condition that overcurrent is generated in the circuit.
In some embodiments, the over-current protection circuit includes: the power supply module is used for supplying power to the load through the switch end of the relay; the current sampling module is electrically connected with the power supply module and is used for sampling current of the power supply module; the control signal input end of the relay is electrically connected with the overcurrent detection control module; the over-current detection control module is electrically connected with the current sampling module; the overcurrent detection control module is used for outputting a control signal to the relay according to the current signal output by the current sampling module.
In some embodiments, the power supply module comprises: the first power supply module is electrically connected with the rectifying circuit; the rectifying circuit is electrically connected with the current sampling module and is electrically connected with the load through the switch end of the relay.
In some embodiments, the overcurrent protection circuit further includes: and the input end of the power factor correction module is electrically connected with the rectifying circuit, and the output end of the power factor correction module is electrically connected with the load through the switch end of the relay.
In some embodiments, the rectifier circuit is a capacitive filter type rectifier circuit.
In some embodiments, the over-current detection control module comprises: the overcurrent detection module is respectively electrically connected with the current sampling module and the controller and is used for amplifying a current signal output by the current sampling module; the control signal output end of the controller is respectively and electrically connected with the base electrode of the triode and the first end of the first resistor; the controller is used for outputting a voltage signal to the triode according to the current signal output by the overcurrent detection module; an emitting electrode of the triode is electrically connected with the current sampling module and the second end of the first resistor respectively, and a collecting electrode of the triode is electrically connected with the anode of the diode and the relay respectively; the second end of the first resistor is grounded; and the cathode of the diode is electrically connected with the relay and the second power supply module respectively.
In some embodiments, the current sampling module comprises: the first end of the second resistor is respectively and electrically connected with the first end of a third resistor, the rectifying circuit and the first end of the over-current detection module, and the second end of the second resistor is respectively and electrically connected with the second end of the third resistor, the second end of the over-current detection module, the emitting electrode of the triode and the second end of the first resistor; and the first end of the third resistor is respectively and electrically connected with the rectifying circuit and the first end of the over-current detection module, and the second end of the third resistor is respectively and electrically connected with the second end of the over-current detection module, the emitting electrode of the triode and the second end of the first resistor.
In some embodiments, the current sampling module is a precision sampling resistor.
In some embodiments, the switching power supply circuit includes the overcurrent protection circuit described above.
In some embodiments, the computer board includes the switching power supply circuit.
In some embodiments, the air conditioner comprises the computer board.
The overcurrent protection circuit, the switching power supply circuit, the computer board and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects: according to the scheme, the current sampling module is used for sampling the current of the power supply module, and the overcurrent detection control module is used for outputting a control signal to the relay according to a current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the overcurrent signal output by the current sampling module so as to disconnect the power supply module from the load. Thereby reducing the possibility of the circuit being burned out when an overcurrent is generated in the circuit.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic structural diagram of an overcurrent protection circuit provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another overcurrent protection circuit provided in the embodiment of the disclosure;
fig. 3 is a schematic structural diagram of another overcurrent protection circuit provided in the embodiment of the disclosure;
fig. 4-1 is a schematic structural diagram of another overcurrent protection circuit provided by the embodiment of the disclosure;
fig. 4-2 is a schematic structural diagram of another overcurrent protection circuit provided by the embodiment of the disclosure;
fig. 5 is a schematic structural diagram of another overcurrent protection circuit provided in an embodiment of the disclosure.
Reference numerals:
101: a power supply module; 102: a current sampling module; 103: a relay; 104: an overcurrent detection control module; 201: a first power supply module; 202: a rectifying circuit; 301: a power factor correction module; 401: an overcurrent detection module; 402: a controller; 403: a triode; 404: a first resistor; 405: a diode; 406: an operational amplifier; 501: a second resistor; 502: and a third resistor.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and claims of the embodiments of the disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged as appropriate for the embodiments of the disclosure described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
At present, because a power supply circuit is often over-current or short-circuited due to damage of a load, a protective tube and a direct current voltage stabilizing circuit are burnt out slightly, and a higher rectified voltage is connected to the load in series due to damage of the direct current voltage stabilizing circuit, so that more expensive circuit modules are burnt out. The current sampling module is used for sampling the current of the power supply module, and the overcurrent detection control module is used for outputting a control signal to the relay according to the current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the overcurrent signal output by the current sampling module so as to disconnect the connection between the power supply module and the load. Thereby reducing the possibility of the circuit being burned out when an overcurrent is generated in the circuit.
As shown in fig. 1, an embodiment of the present disclosure provides an overcurrent protection circuit, including: the device comprises a power supply module 101, a current sampling module 102, a relay 103 and an overcurrent detection control module 104. The power supply module 101 is used for supplying power to a load through the switch terminal of the relay 103. The current sampling module 102 is electrically connected to the power supply module 101, and the current sampling module 102 is configured to sample current of the power supply module 101. The control signal input end of the relay 103 is electrically connected with the overcurrent detection control module 104. The over-current detection control module 104 is electrically connected to the current sampling module 102, and the over-current detection control module 104 is configured to output a control signal to the relay 103 according to a current signal output by the current sampling module 102.
By adopting the overcurrent protection circuit provided by the embodiment of the disclosure, the current sampling module is used for sampling the current of the power supply module, and the overcurrent detection control module is used for outputting the control signal to the relay according to the current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the overcurrent signal output by the current sampling module so as to disconnect the connection between the power supply module and the load. Thereby reducing the possibility of the circuit being burned out when an overcurrent is generated in the circuit.
Optionally, the power supply module comprises: the power supply comprises a first power supply module and a rectifying circuit. The first power supply module is electrically connected with the rectifying circuit. The rectifying circuit is electrically connected with the current sampling module and is electrically connected with the load through the switch end of the relay.
In some embodiments, as shown in fig. 2, the overcurrent protection circuit includes: the device comprises a first power supply module 201, a rectifying circuit 202, a current sampling module 102, a relay 103 and an over-current detection control module 104. The first power supply module 201 is electrically connected to the rectifier circuit 202. The rectifying circuit 201 is electrically connected to the load through the switching terminal of the relay 103. The current sampling module 102 is electrically connected to the rectifying circuit 201, and the current sampling module 102 is configured to sample a current of the rectifying circuit 201. The control signal input end of the relay 103 is electrically connected with the over-current detection control module 104. The over-current detection control module 104 is electrically connected to the current sampling module 102, and the over-current detection control module 104 is configured to output a control signal to the relay 103 according to a current signal output by the current sampling module 102. Further, the rectifier circuit is a capacitor filter type rectifier circuit. Because the rectifying circuit is a capacitance filtering type rectifying circuit, the initial voltage on a capacitor in the rectifying circuit is zero, and the capacitance value of the capacitor is very large. Therefore, at the moment of power supply of the first power supply module, a large surge current can be formed in the circuit, so that components in the circuit are easy to break down or be damaged. According to the scheme, the current sampling module is used for sampling the current of the power supply module, so that the over-current detection control module can output a control signal to the relay according to the current signal output by the current sampling module. Therefore, under the condition that a large surge current is generated in the circuit, the circuit sampling module can collect the over-current, and the over-current detection control module can output a control signal to the relay according to a current signal output by the current sampling module so as to disconnect the connection between the power supply module and the load. Further, when a large surge current is generated in the circuit, the possibility that components in the circuit are broken down or damaged can be reduced.
Optionally, the overcurrent protection circuit further comprises a power factor correction module. The input end of the power factor correction module is electrically connected with the rectifying circuit, and the output end of the power factor correction module is electrically connected with the load through the switch end of the relay. Therefore, the power factor correction module is added in the circuit, so that the power factor can be improved, the reactive current can be reduced, and the line loss can be reduced.
Furthermore, the output end of the power factor correction module is electrically connected with a load through a normally closed switch of the relay.
In some embodiments, as shown in fig. 3, the overcurrent protection circuit includes: the device comprises a first power supply module 201, a rectifying circuit 202, a current sampling module 102, a relay 103, an over-current detection control module 104 and a power factor correction module 301. The first power supply module 201 is electrically connected to the rectifier circuit 202. The rectifying circuit 201 is electrically connected with the input end of the power factor correction module 301, and the output end of the power factor correction module 301 is electrically connected with the load through the switch end of the relay 103. The current sampling module 102 is electrically connected to the rectifying circuit 201, and the current sampling module 102 is configured to sample a current of the rectifying circuit 201. The control signal input end of the relay 103 is electrically connected with the overcurrent detection control module 104. The over-current detection control module 104 is electrically connected to the current sampling module 102, and the over-current detection control module 104 is configured to output a control signal to the relay 103 according to a current signal output by the current sampling module 102. Therefore, the power factor correction module is added in the circuit, so that the power factor can be improved, the reactive current can be reduced, and the line loss can be reduced. Meanwhile, the current sampling module is used for sampling the current of the power supply module, and the overcurrent detection control module is used for outputting a control signal to the relay according to a current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the overcurrent signal output by the current sampling module so as to disconnect the connection between the power supply module and the load. Thereby reducing the possibility of the circuit being burned out when an overcurrent is generated in the circuit.
Optionally, the over-current detection control module is further explained by the following detailed description:
in an alternative embodiment, the over-current detection control module comprises: the overcurrent detection device comprises an overcurrent detection module, a controller, a triode, a first resistor and a diode. The overcurrent detection module is respectively electrically connected with the current sampling module and the controller and is used for amplifying a current signal output by the current sampling module. The control signal output end of the controller is respectively and electrically connected with the base electrode of the triode and the first end of the first resistor; the controller is used for outputting a voltage signal to the triode according to the current signal output by the overcurrent detection module. And the emitting electrode of the triode is respectively and electrically connected with the current sampling module and the second end of the first resistor, and the collecting electrode of the triode is respectively and electrically connected with the anode of the diode and the relay. The second end of the first resistor is grounded. And the cathode of the diode is respectively and electrically connected with the relay and the second power supply module. In this way, the circuit sampling module can collect an overcurrent in the case where an overcurrent is generated in the circuit or a short circuit occurs. The overcurrent output by the circuit sampling module is amplified by the overcurrent detection module and then output to the controller, so that the controller can output a voltage signal to the triode according to the current signal output by the overcurrent detection module. Therefore, the triode can be conducted to enable the relay to be electrified, and meanwhile, the switch end of the relay is disconnected, so that the power supply module and the load are disconnected. So as to reduce the possibility of the circuit being burnt in case of overcurrent in the circuit.
Optionally, the relay is electrically connected to the second power module. And under the condition that the current signal output by the overcurrent detection module is greater than the reference current, the controller outputs a high-level voltage signal to the triode. And under the condition that the current signal output by the overcurrent detection module is less than or equal to the reference current, the controller outputs a low-level voltage signal to the triode. The transistor is turned on when the controller outputs a high level signal.
As shown in fig. 4-1, the overcurrent protection circuit includes a first power module 201, a rectifier circuit 202, a current sampling module 102, a relay 103, a power factor correction module 301, an overcurrent detection module 401, a controller 402, a transistor 403, a first resistor 404, and a diode 405. The first power supply module 201 is electrically connected to the rectifier circuit 202. The rectifying circuit 201 is electrically connected to an input terminal of the power factor correction module 301, and an output terminal of the power factor correction module 301 is electrically connected to a load through a switch terminal of the relay 103. The current sampling module 102 is electrically connected to the rectifying circuit 201, and the current sampling module 102 is configured to sample current of the rectifying circuit 201. The over-current detection module 401 is electrically connected to the current sampling module 102 and the controller 402, respectively, and the over-current detection module 401 is configured to amplify a current signal output by the current sampling module 102. A control signal output end of the controller 402 is electrically connected with a base of the triode 403 and a first end of the first resistor 404 respectively; the controller 402 is configured to output a voltage signal to the transistor 403 according to the current signal output by the over-current detection module 401. The emitter of the transistor 403 is electrically connected to the current sampling module 102 and the second terminal of the first resistor 404, respectively, and the collector of the transistor 403 is electrically connected to the anode of the diode 405 and the relay 103, respectively. A second terminal of the first resistor 404 is connected to ground. The cathode of the diode 405 is electrically connected to the relay 103 and the second power module, respectively. In this way, the circuit sampling module can collect an overcurrent in the case where an overcurrent is generated in the circuit or a short circuit occurs. The overcurrent output by the circuit sampling module is amplified by the overcurrent detection module and then output to the controller, so that the controller can output a voltage signal to the triode according to the current signal output by the overcurrent detection module. Therefore, the triode can be conducted, so that the relay is electrified, and meanwhile, the switch end of the relay is disconnected to disconnect the power supply module and the load. Further, the possibility of the circuit being burned out can be reduced when an overcurrent is generated in the circuit.
In another optional embodiment, the over-current detection control module comprises: the circuit comprises an operational amplifier, a triode, a first resistor and a diode. The operational amplifier is respectively electrically connected with the current sampling module and the triode and is used for outputting a voltage signal to the triode according to a current signal output by the current sampling module. And the emitting electrode of the triode is respectively and electrically connected with the current sampling module and the second end of the first resistor, and the collecting electrode of the triode is respectively and electrically connected with the anode of the diode and the relay. The second end of the first resistor is grounded. And the cathode of the diode is respectively electrically connected with the relay and the second power supply module. In this way, the circuit sampling module can collect an overcurrent in the case where an overcurrent is generated in the circuit or a short circuit occurs. The operational amplifier outputs a voltage signal to the triode according to the current signal output by the overcurrent detection module, so that the triode can be conducted to enable the relay to be electrified, and the switch end of the relay can be disconnected to disconnect the power supply module and the load. Further, the possibility of circuit burnout can be reduced when overcurrent is generated in the circuit.
As shown in fig. 4-2, the overcurrent protection circuit includes a first power module 201, a rectifying circuit 202, a current sampling module 102, a relay 103, a power factor correction module 301, an operational amplifier 406, a transistor 403, a first resistor 404, and a diode 405. The first power supply module 201 is electrically connected to the rectifier circuit 202. The rectifying circuit 201 is electrically connected to an input terminal of the power factor correction module 301, and an output terminal of the power factor correction module 301 is electrically connected to a load through a switch terminal of the relay 103. The current sampling module 102 is electrically connected to the rectifying circuit 201, and the current sampling module 102 is configured to sample a current of the rectifying circuit 201. The operational amplifier 406 is electrically connected with the current sampling module 102, the base of the transistor 403 and the first end of the first resistor 404, respectively; the operational amplifier 406 is used for outputting a voltage signal to the transistor 403 according to the current signal output by the current sampling module 102. The emitter of the transistor 403 is electrically connected to the current sampling module 102 and the second terminal of the first resistor 404, respectively, and the collector of the transistor 403 is electrically connected to the anode of the diode 405 and the relay 103, respectively. A second terminal of the first resistor 404 is connected to ground. The cathode of the diode 405 is electrically connected to the relay 103 and the second power module, respectively. In this way, the circuit sampling module can collect the overcurrent when the overcurrent is generated or the short circuit is generated in the circuit. The operational amplifier outputs a voltage signal to the triode according to the current signal output by the overcurrent detection module, so that the triode can be conducted to enable the relay to be electrified, and meanwhile, the switch end of the relay is disconnected to disconnect the power supply module and the load. Further, the possibility of the circuit being burned out can be reduced when an overcurrent is generated in the circuit.
Further, the current sampling module is further explained by the following description:
in an alternative embodiment, the current sampling module comprises: a second resistor and a third resistor. The first end of the second resistor is electrically connected with the first end of the third resistor, the rectifying circuit and the first end of the over-current detection module respectively. The second end of the second resistor is electrically connected with the second end of the third resistor, the second end of the over-current detection module, the emitter of the triode and the second end of the first resistor respectively. The first end of the third resistor is respectively and electrically connected with the rectifying circuit and the first end of the overcurrent detection module, and the second end of the third resistor is respectively and electrically connected with the second end of the overcurrent detection module, the emitter of the triode and the second end of the first resistor.
As shown in fig. 5, the overcurrent protection circuit includes a first power module 201, a rectifying circuit 202, a second resistor 501, a third resistor 502, a relay 103, a power factor correction module 301, an overcurrent detection module 401, a controller 402, a transistor 403, a first resistor 404, and a diode 405. The first power supply module 201 is electrically connected to the rectifier circuit 202. The rectifying circuit 201 is electrically connected to an input terminal of the power factor correction module 301, and an output terminal of the power factor correction module 301 is electrically connected to a load through a switch terminal of the relay 103. A first end of the second resistor 501 is electrically connected to a first end of the third resistor 404, the rectifier circuit 202, and a first end of the over-current detection module 401, respectively. A second end of the second resistor 501 is electrically connected to a second end of the third resistor 404, a second end of the over-current detection module 401, an emitter of the transistor 403, and a second end of the first resistor 404, respectively. A first end of the third resistor 502 is electrically connected to the rectifying circuit 202 and a first end of the over-current detection module 401, and a second end of the third resistor 502 is electrically connected to a second end of the over-current detection module 401, an emitter of the transistor 403, and a second end of the first resistor 404. The over-current detection module 401 is electrically connected to the controller 402. A control signal output end of the controller 402 is electrically connected with a base of the triode 403 and a first end of the first resistor 404 respectively; the controller 402 is configured to output a voltage signal to the transistor 403 according to the current signal output by the over-current detection module 401. An emitter of the transistor 403 is electrically connected to a second terminal of the first resistor 404, and a collector of the transistor 403 is electrically connected to an anode of the diode 405 and the relay 103, respectively. A second terminal of the first resistor 404 is connected to ground. The cathodes of the diodes 405 are electrically connected to the relay 103 and the second power module, respectively. In this way, the circuit sampling module can collect the overcurrent when the overcurrent is generated or the short circuit is generated in the circuit. The overcurrent output by the circuit sampling module is amplified by the overcurrent detection module and then output to the controller, so that the controller can output a voltage signal to the triode according to the current signal output by the overcurrent detection module. Therefore, the triode can be conducted, so that the relay is electrified, and meanwhile, the switch end of the relay is disconnected to disconnect the power supply module and the load. Further, the possibility of circuit burnout can be reduced when overcurrent is generated in the circuit.
In another alternative embodiment, the current sampling module is a precision sampling resistor.
The embodiment of the disclosure provides a switching power supply circuit, which comprises the overcurrent protection circuit.
By adopting the switching power supply circuit provided by the embodiment of the disclosure, the current sampling module is used for sampling the current of the power supply module, and the overcurrent detection control module is used for outputting the control signal to the relay according to the current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the overcurrent signal output by the current sampling module so as to disconnect the power supply module from the load. Therefore, the probability of burning the switching power supply circuit can be reduced under the condition that overcurrent is generated in the circuit.
The embodiment of the disclosure provides a computer board, which comprises the overcurrent protection circuit.
By adopting the computer board provided by the embodiment of the disclosure, the current sampling module is used for sampling the current of the power supply module, and the overcurrent detection control module is used for outputting a control signal to the relay according to the current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the overcurrent signal output by the current sampling module so as to disconnect the power supply module from the load. Thereby reducing the possibility of burning the circuit board when overcurrent is generated in the circuit.
The embodiment of the disclosure provides an air conditioner, which comprises the computer board.
By adopting the air conditioner provided by the embodiment of the disclosure, the current sampling module is used for sampling the current of the power supply module, and the over-current detection control module is used for outputting the control signal to the relay according to the current signal output by the current sampling module. Therefore, under the condition that overcurrent is generated in the circuit, the circuit sampling module can collect the overcurrent, and the overcurrent detection control module can output a control signal to the relay according to the overcurrent signal output by the current sampling module so as to disconnect the connection between the power supply module and the load. Therefore, the probability of burning the air conditioner circuit board can be reduced under the condition that overcurrent is generated in the circuit.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and illustrated in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An overcurrent protection circuit, comprising:
the power supply module is used for supplying power to a load through the switch end of the relay;
the current sampling module is electrically connected with the power supply module and is used for sampling current of the power supply module;
the control signal input end of the relay is electrically connected with the overcurrent detection control module;
the over-current detection control module is electrically connected with the current sampling module; the overcurrent detection control module is used for outputting a control signal to the relay according to the current signal output by the current sampling module.
2. The overcurrent protection circuit of claim 1 wherein the power supply module comprises:
the first power supply module is electrically connected with the rectifying circuit;
the rectifying circuit is electrically connected with the current sampling module and is electrically connected with the load through the switch end of the relay.
3. The overcurrent protection circuit of claim 2, further comprising:
and the input end of the power factor correction module is electrically connected with the rectifying circuit, and the output end of the power factor correction module is electrically connected with the load through the switch end of the relay.
4. The overcurrent protection circuit of claim 3 wherein the rectifier circuit is a capacitive filter type rectifier circuit.
5. The over-current protection circuit according to any one of claims 2 to 4, wherein the over-current detection control module comprises:
the overcurrent detection module is respectively and electrically connected with the current sampling module and the controller and is used for amplifying a current signal output by the current sampling module;
the control signal output end of the controller is respectively and electrically connected with the base electrode of the triode and the first end of the first resistor; the controller is used for outputting a voltage signal to the triode according to the current signal output by the overcurrent detection module;
an emitting electrode of the triode is electrically connected with the current sampling module and the second end of the first resistor respectively, and a collecting electrode of the triode is electrically connected with the anode of the diode and the relay respectively;
the second end of the first resistor is grounded;
and the cathode of the diode is electrically connected with the relay and the second power supply module respectively.
6. The overcurrent protection circuit of claim 5, wherein the current sampling module comprises:
the first end of the second resistor is respectively and electrically connected with the first end of a third resistor, the rectifying circuit and the first end of the over-current detection module, and the second end of the second resistor is respectively and electrically connected with the second end of the third resistor, the second end of the over-current detection module, the emitting electrode of the triode and the second end of the first resistor;
and the first end of the third resistor is respectively and electrically connected with the rectifying circuit and the first end of the overcurrent detection module, and the second end of the third resistor is respectively and electrically connected with the second end of the overcurrent detection module, the emitter of the triode and the second end of the first resistor.
7. The overcurrent protection circuit of any one of claims 1 to 4, wherein the current sampling module is a precision sampling resistor.
8. A switching power supply circuit comprising the overcurrent protection circuit as set forth in any one of claims 1 to 7.
9. A computer board comprising the switching power supply circuit according to claim 8.
10. An air conditioner comprising the computer board of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221311787.XU CN217824228U (en) | 2022-05-27 | 2022-05-27 | Overcurrent protection circuit, switching power supply circuit, computer board and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221311787.XU CN217824228U (en) | 2022-05-27 | 2022-05-27 | Overcurrent protection circuit, switching power supply circuit, computer board and air conditioner |
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| CN217824228U true CN217824228U (en) | 2022-11-15 |
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| CN202221311787.XU Active CN217824228U (en) | 2022-05-27 | 2022-05-27 | Overcurrent protection circuit, switching power supply circuit, computer board and air conditioner |
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| CN (1) | CN217824228U (en) |
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- 2022-05-27 CN CN202221311787.XU patent/CN217824228U/en active Active
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