CN216199166U - Protection circuit, protection device and electronic equipment - Google Patents
Protection circuit, protection device and electronic equipment Download PDFInfo
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- CN216199166U CN216199166U CN202122336311.3U CN202122336311U CN216199166U CN 216199166 U CN216199166 U CN 216199166U CN 202122336311 U CN202122336311 U CN 202122336311U CN 216199166 U CN216199166 U CN 216199166U
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Abstract
The utility model discloses a protection circuit, a protection device and electronic equipment, and belongs to the field of circuits. The protection circuit comprises a detection module, a first comparison module and a first control module; the first comparison module is respectively connected with the detection module and the first control module; the detection module is used for detecting temperature information of target equipment and outputting a first detection signal according to the temperature information, the first comparison module is used for receiving the first detection signal and outputting a first comparison signal according to the first detection signal, the first control module is used for receiving the first comparison signal and outputting a first control signal according to the first comparison signal, and the first control module is used for changing the output state of a fan of the target equipment through the first control signal so as to carry out over-temperature protection on the target equipment. The protection circuit can adjust the rotating speed of the fan according to the temperature change of the target equipment, so that the power consumption of the fan is reduced, and meanwhile, the over-temperature protection of the target equipment is realized.
Description
Technical Field
The present invention relates to the field of circuits, and in particular, to a protection circuit, a protection device, and an electronic apparatus.
Background
At present, most of electronic devices are provided with fans to perform heat dissipation treatment on internal components, but the voltage supplied to the fans in the circuits is often fixed, so that the rotating speed of the fans cannot be adjusted according to the change of the internal temperature of the devices, and the power consumption of the fans is high, therefore, how to provide a protection circuit reduces the power consumption of the fans in the electronic devices while performing over-temperature protection treatment on the electronic devices becomes a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a protection circuit which can reduce the power consumption of a fan in an electronic device while performing over-temperature protection processing on the electronic device.
The utility model also provides a protection device with the protection circuit.
The utility model also provides electronic equipment with the protection device.
The protection circuit comprises a detection module, a first comparison module and a first control module;
the first comparison module is respectively connected with the detection module and the first control module;
the detection module is used for detecting temperature information of target equipment and outputting a first detection signal according to the temperature information, the first comparison module is used for receiving the first detection signal and outputting a first comparison signal according to the first detection signal, the first control module is used for receiving the first comparison signal and outputting a first control signal according to the first comparison signal, and the first control module is used for changing the output state of a fan of the target equipment through the first control signal so as to carry out over-temperature protection on the target equipment.
The protection circuit provided by the embodiment of the utility model at least has the following beneficial effects: the protection circuit detects temperature information of target equipment through the detection module and outputs a first detection signal according to the temperature information, the first comparison module is used for receiving the first detection signal and outputting a first comparison signal according to the first detection signal, the first control module is used for receiving the first comparison signal and outputting a first control signal according to the first comparison signal, and the first control module is used for changing the output state of a fan of the target equipment through the first control signal, so that the rotating speed of the fan can be adjusted according to the change of the temperature of the target equipment, the power consumption of the fan is reduced, and meanwhile, over-temperature protection of the target equipment is achieved.
According to some embodiments of the utility model, the detection module comprises a first resistor, a second resistor, a first diode, a third resistor, and a second diode;
the first end of the first resistor is connected with a first input end of an external power supply, and the second end of the first resistor is connected with the first end of the second resistor;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with the anode of the first diode;
the anode of the first diode is connected with the second end of the second resistor, and the cathode of the first diode is respectively connected with the cathode of the second diode and the first comparison module;
the first end of the third resistor is connected with the second input end of the external power supply, and the second end of the third resistor is connected with the anode of the second diode;
the anode of the second diode is connected with the second end of the third resistor, and the cathode of the second diode is respectively connected with the cathode of the first diode and the first comparison module.
According to some embodiments of the utility model, the first comparison module comprises a first voltage comparator, a first capacitor and a fourth resistor;
a negative input end of the first voltage comparator is connected with a first end of the first capacitor, a cathode of the first diode and a cathode of the second diode respectively, a positive input end of the first voltage comparator is connected with a second end of the first capacitor, and an output end of the first voltage comparator is connected with a first end of the fourth resistor;
a first end of the first capacitor is connected with a negative input end of the first voltage comparator, a cathode of the first diode and a cathode of the second diode respectively, and a second end of the first capacitor is connected with a positive input end of the first voltage comparator;
and the first end of the fourth resistor is connected with the output end of the first voltage comparator, and the second end of the fourth resistor is connected with the first control module.
According to some embodiments of the utility model, the first control module comprises a transistor;
the base electrode of the triode is connected with the second end of the fourth resistor, the emitting electrode of the triode is connected with the third input end of the external power supply, and the collecting electrode of the triode is connected with the fan.
According to some embodiments of the utility model, the protection circuit further comprises a second comparison module;
the second comparison module is connected with the detection module, the detection module is further used for outputting a second detection signal, and the second comparison module is used for receiving the second detection signal and outputting a second comparison signal according to the second detection signal.
According to some embodiments of the utility model, the second comparing module comprises a fifth resistor, a sixth resistor, a seventh resistor, a second voltage comparator, a second capacitor, an eighth resistor and a third capacitor;
a first end of the fifth resistor is connected with a second end of the second resistor and an anode of the first diode respectively, and a second end of the fifth resistor is connected with a positive input end of the second voltage comparator and a first end of the second capacitor respectively;
a first end of the sixth resistor is connected with a fourth input end of the external power supply, and a second end of the sixth resistor is connected with a first end of the seventh resistor;
a first end of the seventh resistor is connected to a second end of the sixth resistor, and a second end of the seventh resistor is respectively connected to a negative input end of the second voltage comparator and a second end of the second capacitor;
a positive input end of the second voltage comparator is connected with the second end of the fifth resistor and the first end of the second capacitor respectively, a negative input end of the second voltage comparator is connected with the second end of the second capacitor and the second end of the seventh resistor respectively, and an output end of the second voltage comparator is connected with a fourth input end of the external power supply, the first end of the eighth resistor and the first end of the third capacitor respectively;
a first end of the second capacitor is connected with a positive input end of the second voltage comparator and a second end of the fifth resistor respectively, and a second end of the second capacitor is connected with a negative input end of the second voltage comparator and a second end of the seventh resistor respectively;
the first end of the eighth resistor is connected with the output end of the second voltage comparator;
and the first end of the third capacitor is connected with the output end of the second voltage comparator, and the second end of the third capacitor is grounded.
According to some embodiments of the utility model, the protection circuit further comprises a second control module;
the second control module is connected with the second comparison module, and is used for receiving a second comparison signal output by the second comparison module and outputting a second control signal according to the second comparison signal so as to change the working state of the target device through the second control signal.
According to some embodiments of the utility model, the second control module comprises a third diode and a control chip;
and the anode of the third diode is connected with the second end of the eighth resistor, and the cathode of the third diode is connected with the control chip.
The protection device according to the second aspect embodiment of the utility model comprises the protection circuit according to the first aspect embodiment.
The protection device provided by the embodiment of the utility model at least has the following beneficial effects: the protection device adopts the protection circuit to detect the temperature information of the target equipment through the detection module and output a first detection signal according to the temperature information, the first comparison module is used for receiving the first detection signal and outputting a first comparison signal according to the first detection signal, the first control module is used for receiving the first comparison signal and outputting a first control signal according to the first comparison signal, and the first control module is used for changing the output state of the fan of the target equipment through the first control signal, so that the rotating speed of the fan can be adjusted according to the change of the temperature of the target equipment, the power consumption of the fan is reduced, and meanwhile, the over-temperature protection of the target equipment is realized.
An electronic device according to an embodiment of a third aspect of the utility model comprises the protection device according to the embodiment of the second aspect.
According to the electronic equipment provided by the embodiment of the utility model, at least the following beneficial effects are achieved: the electronic device adopts the protection device to detect the temperature information of the target device through the detection module and output a first detection signal according to the temperature information, the first comparison module is used for receiving the first detection signal and outputting a first comparison signal according to the first detection signal, the first control module is used for receiving the first comparison signal and outputting a first control signal according to the first comparison signal, and the first control module is used for changing the output state of the fan of the target device through the first control signal, so that the rotating speed of the fan can be adjusted according to the change of the temperature of the target device, the power consumption of the fan is reduced, and meanwhile, the over-temperature protection of the target device is realized.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the following figures and examples, in which:
FIG. 1 is a block diagram of a protection circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a protection circuit according to another embodiment of the present invention;
fig. 3 is a circuit diagram of a protection circuit according to another embodiment of the utility model.
Reference numerals: 100. a detection module; 110. a first comparison module; 120. a first control module; 130. a second comparison module; 140. a second control module; 141. a control chip; 210. a first input terminal; 220. a second input terminal; 230. a third input terminal; 240. a fourth input terminal; 300. a fan.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In a first aspect, referring to fig. 1 and 3, the protection circuit of the embodiment of the present invention includes a detection module 100, a first comparison module 110, and a first control module 120; the first comparison module 110 is respectively connected with the detection module 100 and the first control module 120; the detection module 100 is configured to detect temperature information of a target device and output a first detection signal according to the temperature information, the first comparison module 110 is configured to receive the first detection signal and output a first comparison signal according to the first detection signal, the first control module 120 is configured to receive the first comparison signal and output a first control signal according to the first comparison signal, and the first control module 120 is configured to change an output state of the fan 300 of the target device according to the first control signal to perform over-temperature protection on the target device. In the working process of the circuit, since the efficiency of most power conversion devices (such as a switching power supply) in the working process cannot reach 100%, power loss is generated in the target device in the running process, the lost power is basically converted into heat energy, and the temperature of components in the device is changed due to heat accumulation in the target device. The detection module 100 can detect temperature information of the target device and output a corresponding first detection signal according to a change in temperature, and specifically, the detection module 100 includes a thermistor that can change its resistance according to a change in temperature, thereby outputting a corresponding first detection signal. The first comparing module 110 is configured to receive the first detection signal and output a first comparison signal according to the first detection signal, and specifically, the first comparing module 110 includes a first voltage comparator U1, and the first voltage comparator U1 is configured to receive the first detection signal and output a corresponding high level or a corresponding low level according to the first detection signal. The first control module 120 is configured to receive the first comparison signal and output a first control signal according to the first comparison signal, the first control module 120 includes a transistor Q1, the transistor Q1 is configured to receive the level signal output by the first voltage comparator U1 and change its operating state according to the level signal, so as to adjust the voltage output to the fan 300, and in this way, the voltage of the fan 300 can be changed according to the temperature information of the target device, so as to adjust the rotation speed of the fan 300, thereby implementing over-temperature protection on the target device, and simultaneously reducing the power consumption of the fan 300.
Referring to fig. 3, in some embodiments, the detection module 100 includes a first resistor R1, a second resistor R2, a first diode D1, a third resistor R3, and a second diode D2; a first end of the first resistor R1 is connected to the first input end 210 of the external power supply, and a second end of the first resistor R1 is connected to a first end of the second resistor R2; a first end of the second resistor R2 is connected with a second end of the first resistor R1, and a second end of the second resistor R2 is connected with the anode of the first diode D1; the anode of the first diode D1 is connected to the second end of the second resistor R2, and the cathode of the first diode D1 is connected to the cathode of the second diode D2 and the first comparing module 110, respectively; a first end of the third resistor R3 is connected to the second input terminal 220 of the external power supply, and a second end of the third resistor R3 is connected to the anode of the second diode D2; an anode of the second diode D2 is connected to the second terminal of the third resistor R3, and a cathode of the second diode D2 is connected to the cathode of the first diode D1 and the first comparing module 110, respectively. In the operation process of the circuit, the first resistor R1 is a thermistor, and when the temperature of the target device is lower, the resistance value of the first resistor R1 is larger. Conversely, when the target device temperature is high, the resistance value of the first resistor R1 is small.
Referring to fig. 3, in some embodiments, the first comparing module 110 includes a first voltage comparator U1, a first capacitor C1, and a fourth resistor R4; a negative input end of the first voltage comparator U1 is respectively connected with a first end of the first capacitor C1, a cathode of the first diode D1 and a cathode of the second diode D2, a positive input end of the first voltage comparator U1 is connected with a second end of the first capacitor C1, and an output end of the first voltage comparator U1 is connected with a first end of the fourth resistor R4; a first end of the first capacitor C1 is connected to the negative input end of the first voltage comparator U1, the cathode of the first diode D1 and the cathode of the second diode D2, respectively, and a second end of the first capacitor C1 is connected to the positive input end of the first voltage comparator U1; the first end of the fourth resistor R4 is connected to the output terminal of the first voltage comparator U1, and the second end of the fourth resistor R4 is connected to the first control module 120. In the operation of the circuit, when the resistance of the first resistor R1 is larger, the voltage at the positive input terminal of the first voltage comparator U1 is larger than that at the negative input terminal, and the output terminal of the first voltage comparator U1 outputs a high level. When the resistance of the first resistor R1 is small, the voltage at the positive input terminal of the first voltage comparator U1 is smaller than that at the negative input terminal, and the output terminal of the first voltage comparator U1 outputs a low level.
Referring to fig. 3, in some embodiments, the first control module 120 includes a transistor Q1; the base of the transistor Q1 is connected to the second terminal of the fourth resistor R4, the emitter of the transistor Q1 is connected to the third input terminal 230 of the external power source, and the collector of the transistor Q1 is connected to the fan 300. In the working process of the circuit, when the temperature of the target device is low (for example, the temperature is 25 ℃), the resistance value of the first resistor R1 is large, at this time, the voltage of the positive input end of the first voltage comparator U1 is larger than the voltage of the negative input end, so that the first voltage comparator U1 outputs a high level signal, because the first voltage comparator U1 outputs a high level signal, the triode Q1 works in a cut-off state, at this time, the output voltage of the triode Q1 does not reach the starting voltage of the fan 300, the fan 300 does not work, so that the fan 300 can be turned off when the temperature of the target device is low, and the power consumption of the fan 300 is saved. After the target device operates for a period of time, the temperature of components inside the device may increase (for example, the temperature is 50 ℃), at this time, the resistance value of the first resistor R1 may decrease, when the resistance value of the first resistor R1 gradually decreases and the voltage of the positive input terminal of the first voltage comparator U1 is smaller than the voltage of the negative input terminal, the first voltage comparator U1 outputs a first low level signal, at this time, the transistor Q1 operates in an amplification state, the output voltage of the transistor Q1 is higher than the starting voltage of the fan 300, the fan 300 starts to operate, and the target device is cooled at a certain rotation speed. If the temperature of the target device continues to increase (for example, the temperature is 75 ℃), the resistance of the first resistor R1 continues to decrease, and at this time, the voltage of the negative input terminal of the first voltage comparator U1 is greater than the sum of the voltage of the positive input terminal and the bias voltage of the first voltage comparator U1, so that the first voltage comparator U1 outputs the second low-level signal, it should be noted that the voltage value of the second low-level signal is less than the voltage value of the first low-level signal, at this time, the transistor Q1 operates in a saturation state, the output voltage of the transistor Q1 enables the fan 300 to operate at the maximum operating voltage (for example, the maximum operating voltage is 12V), and further, the fan 300 performs cooling processing on the target device at the maximum rotation speed.
Referring to fig. 2 and 3, in some embodiments, the protection circuit further includes a second comparison module 130; the second comparing module 130 is connected to the detecting module 100, the detecting module 100 is further configured to output a second detecting signal, and the second comparing module 130 is configured to receive the second detecting signal and output a second comparing signal according to the second detecting signal. In order to improve the working safety of the protection circuit, when the working temperature of the target device is too high (for example, the temperature is 100 ℃), the protection circuit controls the target device to stop working. Specifically, when the temperature of the target device is too high, the first resistor R1 may be smaller than the predetermined resistance value, the detection module 100 may output the second detection signal, and at this time, the second comparison module 130 may receive the second detection signal, the second comparison module 130 includes a second voltage comparator U2, and the second voltage comparator U2 may output a corresponding high level or low level signal according to the second detection signal, so as to control the operating state of the target device.
Referring to fig. 3, in some embodiments, the second comparing module 130 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second voltage comparator U2, a second capacitor C2, an eighth resistor R8, and a third capacitor C3; a first end of the fifth resistor R5 is connected to a second end of the second resistor R2 and the anode of the first diode D1, respectively, and a second end of the fifth resistor R5 is connected to the positive input end of the second voltage comparator U2 and the first end of the second capacitor C2, respectively; a first end of the sixth resistor R6 is connected to the fourth input terminal 240 of the external power source, and a second end of the sixth resistor R6 is connected to a first end of the seventh resistor R7; a first end of the seventh resistor R7 is connected to a second end of the sixth resistor R6, and a second end of the seventh resistor R7 is connected to a negative input end of the second voltage comparator U2 and a second end of the second capacitor C2, respectively; the positive input end of the second voltage comparator U2 is connected to the second end of the fifth resistor R5 and the first end of the second capacitor C2, respectively, the negative input end of the second voltage comparator U2 is connected to the second end of the second capacitor C2 and the second end of the seventh resistor R7, respectively, and the output end of the second voltage comparator U2 is connected to the fourth input end 240 of the external power supply, the first end of the eighth resistor R8 and the first end of the third capacitor C3, respectively; a first end of the second capacitor C2 is connected to the positive input end of the second voltage comparator U2 and the second end of the fifth resistor R5, respectively, and a second end of the second capacitor C2 is connected to the negative input end of the second voltage comparator U2 and the second end of the seventh resistor R7, respectively; a first end of the eighth resistor R8 is connected with the output end of the second voltage comparator U2; a first terminal of the third capacitor C3 is connected to the output terminal of the second voltage comparator U2, and a second terminal of the third capacitor C3 is grounded. In the operation process of the circuit, when the target device temperature is too high and the first resistor R1 is smaller than the preset resistance value, the voltage at the positive input end of the second voltage comparator U2 is larger than the sum of the voltage at the negative input end and the bias voltage of the second voltage comparator U2, and at this time, the second voltage comparator U2 outputs a high-level signal.
Referring to fig. 2 and 3, in some embodiments, the protection circuit further includes a second control module 140; the second control module 140 is connected to the second comparing module 130, and the second control module 140 is configured to receive the second comparison signal output by the second comparing module 130, and output a second control signal according to the second comparison signal, so as to change the operating state of the target device through the second control signal. Specifically, the second control module 140 includes a control chip 141, and the control chip 141 can control the operating state of the target device according to the output signal of the second voltage comparator U2, so that when the operating temperature of the target device is too high, the target device can be controlled to stop operating, and the operating safety of the target device is improved.
Referring to fig. 3, in some embodiments, the second control module 140 includes a third diode D3 and a control chip 141; an anode of the third diode D3 is connected to the second terminal of the eighth resistor R8, and a cathode of the third diode D3 is connected to the control chip 141. In the working process of the circuit, when the temperature of the device is too high, so that the second voltage comparator U2 outputs a high level signal, the control chip 141 receives the high level signal, and then controls the target device to stop working, thereby realizing the over-temperature protection of the target device.
In a second aspect, an embodiment of the present invention further provides a protection device, including the protection circuit shown in the first aspect.
According to the protection device, the protection circuit of the above embodiment is adopted to detect temperature information of a target device through the detection module 100 and output a first detection signal according to the temperature information, the first comparison module 110 is used to receive the first detection signal and output a first comparison signal according to the first detection signal, the first control module 120 is used to receive the first comparison signal and output a first control signal according to the first comparison signal, and the first control module 120 is used to change the output state of the fan 300 of the target device through the first control signal, so that the rotation speed of the fan 300 can be adjusted according to the change of the temperature of the target device, the power consumption of the fan 300 is reduced, and meanwhile, over-temperature protection of the target device is realized.
In a third aspect, the present invention further provides an electronic device, including the protection apparatus shown in the second aspect.
The protection device for the electronic device adopting the above embodiment detects temperature information of a target device through the detection module 100 and outputs a first detection signal according to the temperature information, the first comparison module 110 is configured to receive the first detection signal and output a first comparison signal according to the first detection signal, the first control module 120 is configured to receive the first comparison signal and output a first control signal according to the first comparison signal, and the first control module 120 is configured to change an output state of the fan 300 of the target device through the first control signal, so that a rotation speed of the fan 300 can be adjusted according to a change of the temperature of the target device, thereby reducing power consumption of the fan 300 and simultaneously realizing over-temperature protection of the target device.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The protection circuit is characterized by comprising a detection module, a first comparison module and a first control module;
the first comparison module is respectively connected with the detection module and the first control module;
the detection module is used for detecting temperature information of target equipment and outputting a first detection signal according to the temperature information, the first comparison module is used for receiving the first detection signal and outputting a first comparison signal according to the first detection signal, the first control module is used for receiving the first comparison signal and outputting a first control signal according to the first comparison signal, and the first control module is used for changing the output state of a fan of the target equipment through the first control signal so as to carry out over-temperature protection on the target equipment.
2. The protection circuit of claim 1, wherein the detection module comprises a first resistor, a second resistor, a first diode, a third resistor, and a second diode;
the first end of the first resistor is connected with a first input end of an external power supply, and the second end of the first resistor is connected with the first end of the second resistor;
the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is connected with the anode of the first diode;
the anode of the first diode is connected with the second end of the second resistor, and the cathode of the first diode is respectively connected with the cathode of the second diode and the first comparison module;
the first end of the third resistor is connected with the second input end of the external power supply, and the second end of the third resistor is connected with the anode of the second diode;
the anode of the second diode is connected with the second end of the third resistor, and the cathode of the second diode is respectively connected with the cathode of the first diode and the first comparison module.
3. The protection circuit of claim 2, wherein the first comparison module comprises a first voltage comparator, a first capacitor and a fourth resistor;
a negative input end of the first voltage comparator is connected with a first end of the first capacitor, a cathode of the first diode and a cathode of the second diode respectively, a positive input end of the first voltage comparator is connected with a second end of the first capacitor, and an output end of the first voltage comparator is connected with a first end of the fourth resistor;
a first end of the first capacitor is connected with a negative input end of the first voltage comparator, a cathode of the first diode and a cathode of the second diode respectively, and a second end of the first capacitor is connected with a positive input end of the first voltage comparator;
and the first end of the fourth resistor is connected with the output end of the first voltage comparator, and the second end of the fourth resistor is connected with the first control module.
4. The protection circuit of claim 3, wherein the first control module comprises a transistor;
the base electrode of the triode is connected with the second end of the fourth resistor, the emitting electrode of the triode is connected with the third input end of the external power supply, and the collecting electrode of the triode is connected with the fan.
5. The protection circuit of claim 4, further comprising a second comparison module;
the second comparison module is connected with the detection module, the detection module is further used for outputting a second detection signal, and the second comparison module is used for receiving the second detection signal and outputting a second comparison signal according to the second detection signal.
6. The protection circuit of claim 5, wherein the second comparison module comprises a fifth resistor, a sixth resistor, a seventh resistor, a second voltage comparator, a second capacitor, an eighth resistor, and a third capacitor;
a first end of the fifth resistor is connected with a second end of the second resistor and an anode of the first diode respectively, and a second end of the fifth resistor is connected with a positive input end of the second voltage comparator and a first end of the second capacitor respectively;
a first end of the sixth resistor is connected with a fourth input end of the external power supply, and a second end of the sixth resistor is connected with a first end of the seventh resistor;
a first end of the seventh resistor is connected to a second end of the sixth resistor, and a second end of the seventh resistor is respectively connected to a negative input end of the second voltage comparator and a second end of the second capacitor;
a positive input end of the second voltage comparator is connected with the second end of the fifth resistor and the first end of the second capacitor respectively, a negative input end of the second voltage comparator is connected with the second end of the second capacitor and the second end of the seventh resistor respectively, and an output end of the second voltage comparator is connected with a fourth input end of the external power supply, the first end of the eighth resistor and the first end of the third capacitor respectively;
a first end of the second capacitor is connected with a positive input end of the second voltage comparator and a second end of the fifth resistor respectively, and a second end of the second capacitor is connected with a negative input end of the second voltage comparator and a second end of the seventh resistor respectively;
the first end of the eighth resistor is connected with the output end of the second voltage comparator;
and the first end of the third capacitor is connected with the output end of the second voltage comparator, and the second end of the third capacitor is grounded.
7. The protection circuit of claim 6, further comprising a second control module;
the second control module is connected with the second comparison module, and is used for receiving a second comparison signal output by the second comparison module and outputting a second control signal according to the second comparison signal so as to change the working state of the target device through the second control signal.
8. The protection circuit of claim 7, wherein the second control module comprises a third diode and a control chip;
and the anode of the third diode is connected with the second end of the eighth resistor, and the cathode of the third diode is connected with the control chip.
9. Protection device, characterized in that it comprises a protection circuit according to any one of claims 1 to 8.
10. Electronic equipment, characterized in that it comprises a protection device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122336311.3U CN216199166U (en) | 2021-09-26 | 2021-09-26 | Protection circuit, protection device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122336311.3U CN216199166U (en) | 2021-09-26 | 2021-09-26 | Protection circuit, protection device and electronic equipment |
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