CN213990124U - Power input protection circuit - Google Patents
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- CN213990124U CN213990124U CN202022332582.7U CN202022332582U CN213990124U CN 213990124 U CN213990124 U CN 213990124U CN 202022332582 U CN202022332582 U CN 202022332582U CN 213990124 U CN213990124 U CN 213990124U
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Abstract
The application relates to a power input protection circuit, which comprises a first voltage stabilizing unit, a delay unit and a switch unit, wherein the delay unit is respectively and electrically connected with the first voltage stabilizing unit, the switch unit and a power supply input end; the time delay unit is at least used for converting the power supply voltage input by the power supply input end into a first switch voltage within the preset power-on time; the switch unit is at least used for controlling the power supply input end and the power supply output end to be disconnected when receiving the first switch voltage, and through the application, the problems that electric sparks are generated instantly when the direct current source is input and the reliability of the power supply input is poor in the related technology are solved, the phenomenon that the electric sparks are generated instantly when the direct current source is input is effectively solved, and the beneficial effect of providing a stable and reliable protection circuit for the power supply input is achieved.
Description
Technical Field
The present application relates to the field of dc power supplies, and more particularly, to a power input protection circuit.
Background
Along with the continuous improvement of the living standard of people, the use requirements of electronic products and electric appliances are also more and more increased. Various electronic products require power sources, especially portable electronic products. In the prior art, many electronic products are powered by a direct current power supply, but when the conventional direct current power supply is used for supplying power to the electronic products, electric sparks are easily generated at the moment of electrifying.
In order to eliminate sparks in the power-on process, the spark elimination circuit realizes delay of power-on by utilizing capacitor charging, and achieves spark elimination. However, the above-mentioned spark-quenching circuit uses a large capacitor and cannot protect the circuit against an abnormal power supply voltage in order to provide a protection function.
At present, no effective solution is provided for the problems of electric sparks generated instantly by direct current source input and poor reliability of power source input in the related technology.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a power input protection circuit, which is used for at least solving the problems that electric sparks are generated instantly when a direct current source is input and the reliability of power input is poor in the related technology.
In a first aspect, an embodiment of the present application provides a power input protection circuit, including a first voltage stabilizing unit, a delay unit, and a switch unit, where the delay unit is electrically connected to the first voltage stabilizing unit, the switch unit, and a power supply input terminal respectively, and the switch unit is also electrically connected to the power supply input terminal and the power supply output terminal, where the first voltage stabilizing unit is configured to stabilize a power supply voltage input by the power supply input terminal within a preset voltage range; the time delay unit is at least used for converting the power supply voltage input by the power supply input end into a first switch voltage within preset power-on time; the switch unit is at least used for controlling the power supply input end to be disconnected with the power supply output end when the first switch voltage is received.
In some embodiments, the delay unit includes an RC delay circuit, an input end of the RC delay circuit is electrically connected to the first voltage stabilizing unit and a control end of the switch unit, respectively, an input end of the RC delay circuit is further electrically connected to the power supply input end, and an output end of the RC delay circuit is grounded, where the RC delay circuit is at least configured to charge a capacitor of the RC delay circuit within the preset power-on time and convert the power supply voltage into the first switch voltage.
In some embodiments, the RC delay circuit includes a first capacitor and a first resistor connected in series, one end of the first capacitor is electrically connected to the control terminal of the switch unit, the other end of the first capacitor is connected to the first resistor, and the other end of the first resistor is connected to ground.
In one embodiment, an input terminal of the RC delay circuit is electrically connected to the power supply input terminal through a power-taking circuit, where the power-taking circuit is configured to convert the power supply voltage into a first voltage and transmit the first voltage to the RC delay circuit; the RC delay circuit is at least used for receiving the first voltage and charging a capacitor of the RC delay circuit within the preset power-on time, and converting the first voltage into the first switching voltage.
In one embodiment, the power taking circuit includes a second resistor and a third resistor connected in series, one end of the second resistor is electrically connected to the power supply input end, the other end of the second resistor is electrically connected to the third resistor and the first voltage stabilizing unit, and the other end of the third resistor is electrically connected to the input end of the RC delay circuit and the control end of the switch unit.
In one embodiment, the switch unit includes a first switch tube, the first switch tube includes a first input end, a first control end and a first output end, the first input end is connected to the power supply input end, the first control end is electrically connected to the input end of the delay unit, wherein the first switch tube is at least used for controlling the first input end to be disconnected from the first output end when receiving the first switch voltage.
In one embodiment, the switch unit includes a second switch tube, a third switch tube and a first voltage divider circuit, the second switch tube includes a second input end, a second control end and a second output end, the third switch tube includes a third input end, a third control end and a third output end, the first voltage divider circuit includes a fourth resistor and a fifth resistor connected in series, the second control end is electrically connected to the input end of the delay unit, the second input end is connected to the power supply input end, the second output end is electrically connected to the third control end and an electrical connection point of the fourth resistor and the fifth resistor respectively, the other end of the fourth resistor is electrically connected to the power supply input end, the other end of the fifth resistor is grounded, the third input end is connected to the power supply input end, and the third output end is connected to the power supply output end, the second switching tube is at least used for communicating the second input end with the second output end when the second control end receives the first switching voltage; the third switching tube is at least used for controlling the third input end to be disconnected with the third output end when the second input end is communicated with the second output end and the third control end receives the power supply voltage output by the second output end.
In one embodiment, the third switch tube comprises an a04435MOS chip.
In one embodiment, the power input protection circuit further includes a second voltage stabilizing unit and a filtering unit, the second voltage stabilizing unit is connected to the power input terminal, and the filtering unit is connected to the power output terminal, wherein the second voltage stabilizing unit includes a voltage stabilizing diode and is configured to clamp a power supply voltage input from the power input terminal; the filtering unit is used for filtering the power supply voltage output by the switch unit.
In one embodiment, the first voltage stabilization unit includes a voltage stabilization diode.
Compared with the related art, the power input protection circuit provided by the embodiment of the application comprises a first voltage stabilizing unit, a delay unit and a switch unit, wherein the delay unit is respectively and electrically connected with the first voltage stabilizing unit, the switch unit and a power supply input end, and the switch unit is also electrically connected with a power supply input end and a power supply output end, wherein the first voltage stabilizing unit is used for stabilizing the power supply voltage input by the power supply input end within a preset voltage value range; the time delay unit is at least used for converting the power supply voltage input by the power supply input end into a first switch voltage within the preset power-on time; the switch unit is at least used for controlling the power supply input end and the power supply output end to be disconnected when receiving the first switch voltage, so that the problems that electric sparks are generated at the moment of direct current source input and the reliability of power supply input is poor in the related technology are solved, the phenomenon that the electric sparks are generated at the moment of direct current source input is effectively solved, and the beneficial effect of providing a stable and reliable protection circuit for the power supply input is achieved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a power input protection circuit according to an embodiment of the present invention;
fig. 2 is a circuit topology view of an electronically controlled drive circuit unit according to an embodiment of the present invention;
fig. 3 is a circuit topology view of an electronically controlled drive circuit unit according to a preferred embodiment of the present invention;
fig. 4 is a first schematic diagram of the connection between the status monitoring unit and the main control unit according to the preferred embodiment of the present invention;
fig. 5 is a second schematic diagram of the connection between the status monitoring unit and the main control unit according to the preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated 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. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
The embodiment provides a power input protection circuit. The power input protection circuit of the embodiment is applied to, but not limited to, protection of direct current power input. Fig. 1 is a schematic structural diagram of a power input protection circuit according to an embodiment of the present invention. As shown IN fig. 1, the power input protection circuit includes a first voltage stabilizing unit 100, a delay unit 200 and a switch unit 300, wherein the delay unit 200 is electrically connected to the first voltage stabilizing unit 100, the switch unit 300 and a power input terminal, respectively, IN this embodiment, the power input terminal includes a positive input terminal (12V _ IN +) and a negative input terminal (12V _ IN-), IN this embodiment, the negative input terminal (12V _ IN-) is grounded, and therefore, IN this application, the power input terminal is illustrated as the positive input terminal (12V _ IN +); the switch unit 300 is further electrically connected to a power supply input terminal and a power supply output terminal, in this embodiment, the power supply output terminal includes a positive output terminal (12V _ OUT +) and a negative input terminal (12V _ OUT-), in this embodiment, since the negative output terminal (12V _ OUT-) is correspondingly grounded, in this application, the power supply output terminals are all described as the positive output terminal (12V _ OUT +); IN this embodiment, the first voltage stabilizing unit 100 is configured to stabilize the supply voltage input by the supply input terminal 12V _ IN + within a preset voltage range; the delay unit 200 is at least configured to convert a power supply voltage input by the power supply input terminal 12V _ IN + into a first switching voltage within a preset power-on time; the switching unit 300 is at least used for controlling the power supply input terminal 12V _ IN + to be disconnected from the power supply output terminal 12V _ OUT + when receiving the first switching voltage.
IN this embodiment, the first voltage stabilizing unit 100 is configured to, when the voltage input by the power supply input terminal 12V _ IN + is greater than 12V, stabilize the power supply voltage to a second voltage within a preset voltage range, and transmit the second voltage to the switch unit 300, and after the switch unit 300 receives the second voltage, the switch unit 300 does not start to connect the power supply input terminal 12V _ IN + and the power supply output terminal 12V _ OUT +, so that when the power supply voltage is over-voltage, the power supply output terminal 12V _ OUT + has no voltage output.
IN this embodiment, the delay unit 200 is configured to delay the voltage input along the power supply input end 12V _ IN + to be powered up to the switch unit 300 by performing a delay process on the voltage at the moment of starting the power supply input, so that at the moment of powering up, the switch unit 300 disconnects the power supply input end 12V _ IN + from the power supply output end 12V _ OUT +; the delay unit 200 delays the input voltage, i.e. controls the actual power-on time of the power input, thereby eliminating the electric spark at the moment of power-on.
IN this embodiment, when receiving the second voltage, the switch unit 300 is not activated to connect the power supply input terminal 12V _ IN + and the power supply output terminal 12V _ OUT +; the switching unit 300 disconnects the power supply input terminal 12V _ IN + from the power supply output terminal 12V _ OUT + upon receiving the first switching voltage outputted by the delay unit 200; meanwhile, after the preset power-on time of the switch unit 300 passes, because the delay unit 200 is not performing the delay action, the power supply voltage input by the power supply input end 12V _ IN + outputs a third voltage lower than the power supply voltage after passing through the delay unit 200, and the third voltage can drive the switch unit 300 to communicate the power supply input end 12V _ IN + with the power supply output end 12V _ OUT +, so as to perform normal power supply.
The power input protection circuit solves the problems that electric sparks are generated instantly when a direct current source is input and the reliability of power input is poor in the related technology, effectively solves the problem that electric sparks are generated instantly when the direct current source is input, and provides the beneficial effect of a stable and reliable protection circuit for power input.
Fig. 2 is a first view of a topology structure of a power input protection circuit according to an embodiment of the present invention. As shown IN fig. 2, IN some embodiments, the delay unit 200 includes an RC delay circuit 201, an input terminal of the RC delay circuit 201 is electrically connected to the control terminals of the first voltage stabilizing unit 100 and the switch unit 300, respectively, an input terminal of the RC delay circuit 201 is further electrically connected to the power supply input terminal 12V _ IN +, and an output terminal of the RC delay circuit 201 is grounded, where the RC delay circuit 201 is configured to charge a capacitor (refer to a capacitor C1 IN fig. 2) of the RC delay circuit 201 at least during a preset power-on time and convert the power supply voltage into the first switching voltage.
In this embodiment, the RC delay circuit 201 includes a first capacitor C1 and a first resistor R1 connected in series, one end of the first capacitor C1 is electrically connected to the control terminal of the switch unit 300, the other end is connected to the first resistor R1, and the other end of the first resistor R1 is connected to ground.
In this embodiment, the RC delay circuit 201 constitutes a capacitor charging and discharging circuit, and the charging and discharging circuit controls the power-on time by charging, and the power-on time can be effectively controlled by adjusting the first capacitor C1 and the first resistor R1.
Specifically, when the power supply is not plugged IN, the input of the power supply input terminal 12V _ IN + is 0, and the voltage across the first capacitor C1 is 0V; when a power supply is inserted into the power supply input protection circuit and reaches a steady state, the power supply voltage provides electric energy to charge the first capacitor C1, the voltage at the electric connection point of the control end of the switch unit 300 and the first capacitor C1 is a second voltage, the second voltage cannot drive the switch unit 300 to connect the power supply input end 12V _ IN + with the power supply output end 12V _ OUT +, and the output of the power supply output end 12V _ OUT + is 0; after the preset power-on time, the first capacitor C1 is charged, at this time, the voltage at the electrical connection point between the control end of the switch unit 300 and the first capacitor C1 is the third voltage, the third voltage can drive the switch unit 300 to connect the power supply input end 12V _ IN + with the power supply output end 12V _ OUT +, and the power supply output end 12V _ OUT + outputs normally.
Fig. 3 is a second view of the topology structure of the power input protection circuit according to the embodiment of the present invention, as shown IN fig. 3, IN some embodiments, the input end of the RC delay circuit 201 is electrically connected to the power input end 12V _ IN + through the power-taking circuit 202, wherein the power-taking circuit 202 is used for converting the power supply voltage into the first voltage and transmitting the first voltage to the RC delay circuit 201; the RC delay circuit 201 is at least used for receiving the first voltage and charging the capacitor of the RC delay circuit 201 in the preset power-on time, and converting the first voltage into the first switching voltage.
IN this embodiment, the power-taking circuit 202 includes a second resistor R2 and a third resistor R3 connected IN series, one end of the second resistor R2 is electrically connected to the power supply input terminal 12V _ IN +, the other end of the second resistor R2 is electrically connected to the third resistor R3 and the first voltage stabilizing unit 100, and the other end of the third resistor R3 is electrically connected to the input terminal of the RC delay circuit 201 and the control terminal of the switch unit 300.
In the present embodiment, the first zener unit 100 includes, but is not limited to, a zener diode D1, and in the preferred embodiment of the present application, the zener diode D1 is preferably a zener diode of the ZMM5242B type.
In this embodiment, the second resistor R2, the third resistor R3, the first capacitor C1, and the first resistor R1 form a capacitor charging and discharging circuit, which controls the power-on time, and the first capacitor C1 and the first resistor R1 are adjusted to effectively control the power-on time.
Specifically, when the power supply is not plugged IN, the input of the power supply input terminal 12V _ IN + is 0, and the voltage across the first capacitor C1 is 0V; when a power supply is inserted into the power supply input protection circuit until a steady state is reached, current charges the first capacitor C1 through the second resistor R2 and the third resistor R3, the voltage at the electric connection point of the control end of the switch unit 300 and the first capacitor C1 is a second voltage through the voltage division of the second resistor R2, the third resistor R3 and the first resistor R1, the second voltage cannot drive the switch unit 300 to connect the power supply input end 12V _ IN + with the power supply output end 12V _ OUT +, and the output of the power supply output end 12V _ OUT + is 0; after the preset power-on time, the first capacitor C1 is charged, at this time, the voltage at the electrical connection point between the control end of the switch unit 300 and the first capacitor C1 is the third voltage, the third voltage can drive the switch unit 300 to connect the power supply input end 12V _ IN + with the power supply output end 12V _ OUT +, and the power supply output end 12V _ OUT + outputs normally.
Fig. 4 is a third view of the topology structure of the power input protection circuit according to the embodiment of the present invention, as shown IN fig. 4, IN some embodiments, the switch unit 300 includes a first switch tube Q1, the first switch tube Q1 includes a first input end (corresponding to the terminal S IN fig. 4), a first control end (corresponding to the terminal G IN fig. 4), and a first output end (corresponding to the terminal D IN fig. 4), the first input end is connected to the power input end 12V _ IN +, the first control end is electrically connected to the input end of the delay unit 200, wherein the first switch tube Q1 is at least used for controlling the first input end to be disconnected from the first output end when receiving the first switch voltage.
IN this embodiment, when the first control terminal of the first switching tube Q1 receives the second voltage, the first input terminal and the first output terminal are not conducted, and the power supply input terminal 12V _ IN + and the power supply output terminal 12V _ OUT + are not correspondingly conducted; when the first control end of the first switching tube Q1 receives the first switching voltage output by the delay unit 200, the first input end and the first output end are also not connected, and the power supply input end 12V _ IN + and the power supply output end 12V _ OUT + are correspondingly not connected; after the first capacitor C1 is charged, the first control terminal receives a third voltage lower than the power supply voltage, the third voltage can drive the first input terminal and the first output terminal to be connected, and the corresponding power supply input terminal 12V _ IN + is connected with the power supply output terminal 12V _ OUT + for normal power supply.
Fig. 5 is a view showing the topology of the power input protection circuit according to the embodiment of the present invention, as shown IN fig. 5, IN some embodiments, the switch unit 300 includes a second switch Q2, a third switch Q3 and a first voltage divider circuit, the second switch Q2 includes a second input terminal, a second control terminal and a second output terminal, the third switch Q3 includes a third input terminal, a third control terminal and a third output terminal, the first voltage divider circuit includes a fourth resistor R4 and a fifth resistor R5 connected IN series, the second control terminal is electrically connected to the input terminal of the delay unit 200, the second input terminal is connected to the power input terminal 12V _ IN +, the second output terminal is electrically connected to the third control terminal and the electrical connection point of the fourth resistor R4 and the fifth resistor R5, the other end of the fourth resistor R4 is electrically connected to the power input terminal 12V _ IN +, the other end of the fifth resistor R5 is grounded, the third input end is connected with the power supply input end 12V _ IN +, the third output end is connected with the power supply output end 12V _ OUT +, wherein the second switching tube Q2 is at least used for communicating the second input end with the second output end when the second control end receives the first switching voltage; the third switching tube Q3 is at least used for controlling the third input end to be disconnected from the third output end when the second input end is connected with the second output end and the third control end receives the supply voltage output by the second output end.
In the present embodiment, the second switch Q2 includes, but is not limited to, a transistor or a MOS transistor. In addition, the present application can be implemented whether the switching transistor is an NPN type or PNP type triode or an N-channel or P-channel switching MOS transistor, which is not limited in the embodiments of the present application. In the present embodiment, the third switching transistor Q3 includes, but is not limited to, an a04435MOS chip.
IN this embodiment, the power input protection circuit further includes a second voltage stabilizing unit and a filtering unit, the second voltage stabilizing unit is connected to the power input port 12V _ IN +, the filtering unit is connected to the power output port 12V _ OUT +, wherein the second voltage stabilizing unit includes a voltage stabilizing diode D2 and is configured to clamp the power supply voltage input by the power input port 12V _ IN +; the filtering unit includes a filtering capacitor C3 and is used to filter the supply voltage output by the switching unit 300.
It should be noted that the power input protection circuit of the present application has functions of power-on delay and overvoltage protection. Wherein,
the second resistor R2, the third resistor R3, the first capacitor C1 and the first resistor R1 form a capacitor charging and discharging circuit, power-on time is controlled, and power-on time can be effectively controlled by adjusting the first capacitor C1 and the first resistor R1.
The zener diode D1 is a zener diode for over-voltage protection.
The fourth resistor R4, the fifth resistor R5, and the third capacitor C2 are used for driving the G-pole of the third transistor Q3 (correspondingly, PMOS).
When the power input protection works: when the power supply is not plugged in, the voltage across the first capacitor C1 is 0V. When the power supply is inserted into the protection circuit and reaches a steady state, the current of the second resistor R2 and the third resistor R3 charges the first capacitor C1, and due to the voltage dividing effect of the second resistor R2, the third resistor R3 and the first resistor R1, the voltage difference between the emitter (E) and the base (B) of the second switch tube Q2 (preferably a triode) is greater than the turn-on voltage, so that the second switch tube Q2 is turned on, the G-pole voltage of the third switch tube Q3 is 12V, the S-pole voltage thereof is also 12V, the third switch tube Q3 cannot be turned on, and the output of the power supply output terminal 12V _ OUT + is 0V.
When the first capacitor C1 is charged, so that the voltage difference between the emitter (E) of the second switch tube Q2 and the base (B) of the second switch tube Q2 is smaller than the turn-on voltage, the second switch tube Q2 is turned off, the G-pole voltage of the third switch tube Q3 is the divided voltage obtained by dividing the voltage of the first voltage dividing circuit, the voltage between the S-pole and the G-pole of the third switch tube Q3 is larger than the turn-on voltage, the third switch tube Q3 is turned on, the output of the power supply output end 12V _ OUT + is 12V, the RC delay circuit 201 plays a role in delaying power-on, and eliminates electric sparks at the moment of power-on.
When the input voltage of the power supply input end 12V _ IN + is greater than the sum of 12V and the conducting voltage of the second switching tube Q2, the maximum base voltage of the second switching tube Q2 is 12V under the action of the voltage regulator tube diode D1, then the second switching tube Q2 is always conducting, and the third switching tube Q3 is always off, so that the overvoltage protection function is realized.
In the embodiment of the application, the third switching tube Q3 is controlled by turning on and off the second switching tube Q2, the G-voltage of the third switching tube Q3 changes rapidly, and the control can be responded rapidly, so that the influence on a later-stage system is reduced.
The power input protection circuit has the functions of delaying power-on and overvoltage protection, can effectively eliminate instantaneous spark of power-on, and can effectively protect a follow-up system, the process from switching on to switching off or from switching off to switching on of a follow-up switching tube is quick and stable, the cost is low, the realization is easy, the size of each device is controllable, and the area of a PCB (printed circuit board) can be saved.
It should be understood by those skilled in the art that various features of the above embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power input protection circuit is characterized by comprising a first voltage stabilizing unit, a time delay unit and a switch unit, wherein the time delay unit is respectively and electrically connected with the first voltage stabilizing unit, the switch unit and a power supply input end, the switch unit is also electrically connected with the power supply input end and a power supply output end, and the first voltage stabilizing unit is used for stabilizing the power supply voltage input by the power supply input end within a preset voltage value range; the time delay unit is at least used for converting the power supply voltage input by the power supply input end into a first switch voltage within preset power-on time; the switch unit is at least used for controlling the power supply input end to be disconnected with the power supply output end when the first switch voltage is received.
2. The power input protection circuit of claim 1, wherein the delay unit comprises an RC delay circuit, an input terminal of the RC delay circuit is electrically connected to the first voltage stabilizing unit and the control terminal of the switch unit, respectively, an input terminal of the RC delay circuit is further electrically connected to the power supply input terminal, and an output terminal of the RC delay circuit is grounded, wherein the RC delay circuit is configured to charge a capacitor of the RC delay circuit at least within the preset power-on time and convert the power supply voltage into the first switch voltage.
3. The power input protection circuit according to claim 2, wherein the RC delay circuit comprises a first capacitor and a first resistor connected in series, one end of the first capacitor is electrically connected to the control terminal of the switch unit, the other end of the first capacitor is connected to the first resistor, and the other end of the first resistor is connected to ground.
4. The power input protection circuit of claim 2, wherein the input terminal of the RC delay circuit is electrically connected to the power input terminal through a power-taking circuit, wherein the power-taking circuit is configured to convert the power supply voltage into a first voltage and transmit the first voltage to the RC delay circuit;
the RC delay circuit is at least used for receiving the first voltage and charging a capacitor of the RC delay circuit within the preset power-on time, and converting the first voltage into the first switching voltage.
5. The power input protection circuit according to claim 4, wherein the power-taking circuit includes a second resistor and a third resistor connected in series, one end of the second resistor is electrically connected to the power supply input end, the other end of the second resistor is electrically connected to the third resistor and the first voltage stabilizing unit, and the other end of the third resistor is electrically connected to the input end of the RC delay circuit and the control end of the switch unit.
6. The power input protection circuit of claim 1, wherein the switch unit comprises a first switch tube, the first switch tube comprises a first input terminal, a first control terminal and a first output terminal, the first input terminal is connected to the power input terminal, the first control terminal is electrically connected to the input terminal of the delay unit, and the first switch tube is at least used for controlling the first input terminal to be disconnected from the first output terminal when receiving the first switch voltage.
7. The power input protection circuit of claim 1, wherein the switch unit comprises a second switch tube, a third switch tube and a first voltage divider circuit, the second switch tube comprises a second input end, a second control end and a second output end, the third switch tube comprises a third input end, a third control end and a third output end, the first voltage divider circuit comprises a fourth resistor and a fifth resistor connected in series, the second control end is electrically connected to the input end of the delay unit, the second input end is connected to the power input end, the second output end is electrically connected to the third control end and an electrical connection point of the fourth resistor and the fifth resistor, respectively, the other end of the fourth resistor is electrically connected to the power input end, the other end of the fifth resistor is connected to ground, and the third input end is connected to the power input end, the third output end is connected with the power supply output end, wherein the second switching tube is at least used for communicating the second input end with the second output end when the second control end receives the first switching voltage; the third switching tube is at least used for controlling the third input end to be disconnected with the third output end when the second input end is communicated with the second output end and the third control end receives the power supply voltage output by the second output end.
8. The power input protection circuit of claim 7, wherein the third switching transistor comprises an A04435MOS chip.
9. The power input protection circuit according to claim 1, further comprising a second voltage stabilizing unit and a filtering unit, wherein the second voltage stabilizing unit is connected to the power input terminal, and the filtering unit is connected to the power output terminal, wherein the second voltage stabilizing unit comprises a voltage stabilizing diode and is configured to clamp the power supply voltage input from the power input terminal; the filtering unit is used for filtering the power supply voltage output by the switch unit.
10. The power input protection circuit according to any one of claims 1 to 9, wherein the first voltage regulation unit comprises a voltage regulation diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022332582.7U CN213990124U (en) | 2020-10-19 | 2020-10-19 | Power input protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022332582.7U CN213990124U (en) | 2020-10-19 | 2020-10-19 | Power input protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213990124U true CN213990124U (en) | 2021-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022332582.7U Active CN213990124U (en) | 2020-10-19 | 2020-10-19 | Power input protection circuit |
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| Country | Link |
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| CN (1) | CN213990124U (en) |
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