CN218449462U - Strong electricity overvoltage automated inspection protection circuit - Google Patents
Strong electricity overvoltage automated inspection protection circuit Download PDFInfo
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- CN218449462U CN218449462U CN202222662497.6U CN202222662497U CN218449462U CN 218449462 U CN218449462 U CN 218449462U CN 202222662497 U CN202222662497 U CN 202222662497U CN 218449462 U CN218449462 U CN 218449462U
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Abstract
The utility model discloses a forceful electric power overvoltage automated inspection protective circuit, the utility model relates to a circuit technology field for response time is slower among the solution prior art, occupy the problem of master control platform software and hardware resource. At least comprises the following steps: the protection circuit comprises a power supply protection circuit, a transformer, an AC-DC power supply chip, a triode switch circuit and a device to be protected; the transformer comprises a primary coil, a first secondary coil and a second secondary coil; one end of the primary coil is connected with the power supply protection circuit, and the other end of the primary coil is connected with the AC-DC power supply chip; one end of the first secondary coil is connected with the first rectifying diode and the AC-DC power supply chip, and the other end of the first secondary coil is grounded; one end of the second secondary coil is connected with a triode switch circuit, and the triode switch circuit is connected with a device to be protected; the other end of the second secondary coil is grounded. The device can detect strong current input overvoltage in real time, protects a rear-stage overvoltage sensitive device in real time, and is quick in response.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a forceful electric power overvoltage automated inspection protection circuit.
Background
The variation range of the voltage amplitude of the power grid is greatly different along with the different conditions of the power supply capacity of the power grid, the quality of power transmission and distribution equipment, the power consumption capacity and the like. The variation range of the voltage amplitude of the power grid in certain areas with poor power supply can even reach 20% -30%, and the fluctuation requirement is far higher than 10% of the national standard. When the power supply environment is poor, the input voltage of the electric equipment is easy to generate overvoltage, undervoltage and the like, wherein the electric equipment is easy to be damaged irreversibly under the overvoltage condition, so that property loss is caused.
The main control platform of the device obtains the voltage value of the strong current input through analog-to-digital converter sampling calculation, and when the strong current input is overvoltage, the main control platform judges that the overvoltage is carried out, and then corresponding protection measures are carried out. The scheme has the defects of slow response time, occupation of software and hardware resources of the main control platform and the like.
Therefore, it is desirable to provide a more reliable automatic detection and protection circuit for high voltage and overvoltage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a forceful electric power overvoltage automated inspection protection circuit for response time is slower among the solution prior art, occupy the problem of master control platform software and hardware resource.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a forceful electric power overvoltage automated inspection protective circuit, forceful electric power overvoltage automated inspection protective circuit includes at least:
the protection circuit comprises a power supply protection circuit, a transformer, an AC-DC power supply chip, a triode switch circuit and a device to be protected;
the transformer comprises a primary coil and a secondary coil; the secondary coil comprises a first secondary coil and a second secondary coil;
one end of the primary coil is connected with the power supply protection circuit, and the other end of the primary coil is connected with the AC-DC power supply chip; one end of the first secondary coil is connected with a first rectifying diode and the AC-DC power supply chip, and the other end of the first secondary coil is grounded; one end of the second secondary coil is connected with the triode switch circuit, and the triode switch circuit is connected with the device to be protected; the other end of the second secondary coil is grounded, and the output induced voltage is used for detecting strong current input voltage and driving a triode in the triode switch circuit to output a control signal.
Optionally, the strong overvoltage automatic detection protection circuit further includes:
the rectifier circuit comprises a voltage stabilizing diode, a first voltage dividing resistor, a second voltage dividing resistor and a second rectifying diode; the second rectifying diode, the voltage stabilizing diode and the first voltage dividing resistor are connected in series, and one end of the second voltage dividing resistor is connected with the first voltage dividing resistor and the triode.
Optionally, the strong overvoltage automatic detection protection circuit further includes:
the protection device comprises a power supply loop protection device and a device protection device, wherein the power supply loop protection device comprises a thermistor and a relay;
the device protection is used for ensuring that the device is in an off state when strong current is input to overvoltage.
Optionally, one end of the thermistor is connected with the power protection circuit; the relay is connected with the thermistor in parallel;
the triode switch circuit is also connected with the relay; and the control signal output by the triode switch circuit is used for controlling the relay and the device to be protected, and when the strong-current input voltage is overvoltage, the device to be protected and the relay are switched off.
Optionally, the automatic detection and protection circuit for strong overvoltage further includes:
a rectifying and filtering circuit;
one end of the rectifying and filtering circuit is connected with the other end of the thermistor; and the other end of the rectifying and filtering circuit is connected with the primary coil.
Optionally, the triode includes a first triode and a second triode, and a base of the first triode is connected to the first voltage-dividing resistor and the second voltage-dividing resistor; the collector of the first triode is connected with the base of the second triode; and the emitter of the second triode and the emitter of the first triode are both connected with the second divider resistor, and the collector of the second triode is connected with the device to be protected.
Optionally, the thermistor is a positive temperature coefficient thermistor.
Optionally, the power protection circuit includes a strong current input terminal, and one end of the primary coil is connected to the strong current input terminal of the power protection circuit.
Optionally, the relay is further connected to a power protection circuit.
Compared with the prior art, the utility model provides a forceful electric power overvoltage automated inspection protective circuit includes at least: the protection circuit comprises a power supply protection circuit, a transformer, an AC-DC power supply chip, a triode switch circuit and a device to be protected; the transformer comprises a primary coil and a secondary coil; the secondary coil comprises a first secondary coil and a second secondary coil; one end of the primary coil is connected with the power supply protection circuit, and the other end of the primary coil is connected with the AC-DC power supply chip; one end of the first secondary coil is connected with the first rectifying diode and the AC-DC power supply chip, and the other end of the first secondary coil is grounded; one end of the second secondary coil is connected with a triode switch circuit, and the triode switch circuit is connected with a device to be protected; the other end of the second secondary coil is grounded, and the output induced voltage is used for detecting strong current input voltage and driving a triode in a triode switch circuit to output a control signal. The utility model discloses based on AC-DC alternating current-direct current converting circuit's basis, utilize transformer induced voltage, secondary coil is drawn forth to the transformer, through the real-time induction input voltage of turn ratio, control triode switch circuit realizes real-time detection and protect function, the second secondary coil output induced voltage drive triode output control signal of transformer, the direct control relay reaches and treats the protection device, when forceful electric power input excessive pressure, turn-off at once treats the protection device, the relay is closed simultaneously, the forceful electric power is whole to be passed through thermistor, reduce circuit through-flow capacity, real-time protection rear circuit module. Compared with the method that the main control platform is adopted to obtain the voltage value of the strong current input through the analog-to-digital converter in a sampling calculation mode, and then protective measures are adopted, the scheme has the advantages that the response time is faster, the software and hardware resources of the main control platform are not occupied, the real-time detection can be carried out on the strong current input overvoltage, and the real-time protection can be carried out on the rear-stage overvoltage sensitive device.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
fig. 1 is a circuit structure diagram of an automatic detection and protection circuit for strong current overvoltage according to the present invention.
Reference numerals are as follows:
the protection circuit comprises a power supply protection circuit-101, a thermistor-102, a rectifying and filtering circuit-103, a transformer-104, an AC-DC power supply chip-105, a relay-106 and a device-to-be-protected-107.
Detailed Description
For the convenience of clearly describing the technical solution of the embodiment of the present invention, in the embodiment of the present invention, the words "first", "second", etc. are adopted to distinguish the same items or similar items with basically the same functions and actions. For example, the first threshold and the second threshold are only used for distinguishing different thresholds, and the sequence order of the thresholds is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
It is to be understood that the terms "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.
In the prior art, when the strong-current input voltage exceeds a normal range value, the direct-current voltage subjected to AC-DC conversion is very easy to cause physical damage to a rear-stage overvoltage sensitive device, so that the device cannot work normally. The main control platform obtains the voltage value of the strong current input through analog-to-digital converter sampling calculation, and when the strong current input is overvoltage, the main control platform can perform corresponding protection measures after judging overvoltage. The scheme has the defects of slow response time, occupation of software and hardware resources of the main control platform and the like.
To the above defect, the utility model provides a forceful electric power overvoltage automated inspection protective circuit on AC-DC alternating current-direct current converting circuit's basis, utilizes transformer 104 induced voltage, and control triode switch circuit realizes real-time detection and protect function for to the real-time detection of forceful electric power input overvoltage and to the real-time protection to the sensitive device of excessive pressure of back level. When the strong electric input voltage is in a normal range value, the normal work of the circuit is not influenced.
Next, the scheme provided by the embodiments of the present specification will be described with reference to the accompanying drawings:
fig. 1 is a circuit structure diagram of the strong current overvoltage automatic detection protection circuit provided by the present invention, as shown in fig. 1, the strong current overvoltage automatic detection protection circuit at least may include: the protection circuit comprises a power supply protection circuit 101, a transformer 104, an AC-DC power supply chip 105, a triode switch circuit and a device to be protected 107.
The transformer 104 may include a primary coil and a secondary coil; the secondary coil may include a first secondary coil and a second secondary coil; one end of the primary coil is connected with the power protection circuit 101, and the other end of the primary coil is connected with the AC-DC power supply chip 105; one end of the first secondary coil is connected with a first rectifying diode and the AC-DC power supply chip 105, and the other end of the first secondary coil is grounded; one end of the second secondary coil is connected with the triode switch circuit, and the triode switch circuit is connected with the device to be protected 107; the other end of the second secondary coil is grounded, and the output induced voltage is used for detecting strong current input voltage and driving a triode in the triode switch circuit to output a control signal. More specifically, the induced voltage output by configuring the turns ratio of the coil is used for detecting a strong electric input voltage and driving a triode in the triode switching circuit to output a control signal.
Among other things, the AC-DC power chip 105 may be a device that converts alternating current to direct current, and its power flow may be bi-directional, referred to as "rectification" when power flows from the source to the load, and "active inversion" when power flows from the load back to the source. The AC-DC switching power supply utilizes electronic switching devices such as transistors, field effect transistors, thyristor and the like, and the electronic switching devices are continuously switched on and off through a control circuit, so that the electronic switching devices perform pulse modulation on input voltage, thereby realizing voltage conversion between AC and DC and automatically stabilizing output voltage.
For the transformer 104, the primary coil is a coil group for electrical input, and is connected to a power supply, also called a primary coil; the secondary coil is a coil winding for outputting electricity and is connected with a load, namely a secondary coil; the primary coil is connected with the mains supply, and the secondary coil is connected with the output, and is generally low-voltage. The winding method of the coil is many, and the winding method is generally on the same iron core, and the starting end is pressed in the iron core. The primary winding serves as an input terminal of the transformer 104 and is typically connected to a power source, and the primary winding is intended to absorb energy from the power source and transfer the energy to the secondary winding by electromagnetic induction. The secondary winding is used as the output terminal of the transformer 104, and after being subjected to electromagnetic induction by the primary winding, the voltage (induced electromotive force) generated in the secondary winding is related to the number of turns of the secondary winding, and the more the number of turns of the secondary winding, the higher the secondary voltage. The strong power input terminal of the power protection circuit 101 includes L, E, N.
In the structure in fig. 1, based on the AC-DC converter circuit, the transformer 104 is used to induce voltage, the transformer 104 is used to induce a secondary coil, and the transformer 104 induces input voltage in real time according to the turns ratio, so as to control the triode switch circuit to realize real-time detection and protection functions, the secondary coil of the transformer 104 outputs induced voltage to drive the triode to output a control signal, so as to directly control the relay 106 and the device to be protected 107, when strong current is input to overvoltage, the device to be protected 107 is immediately turned off, and the relay 106 is turned off, so that the strong current passes through the thermistor 102, thereby reducing the current capacity of the circuit and protecting the rear circuit module in real time. Compared with the method that the main control platform is adopted to obtain the voltage value of the strong current input through the analog-to-digital converter in a sampling calculation mode, and then protective measures are adopted, the scheme has the advantages that the response time is faster, the software and hardware resources of the main control platform are not occupied, the real-time detection can be carried out on the strong current input overvoltage, and the real-time protection can be carried out on the rear-stage overvoltage sensitive device.
Based on the structure of fig. 1, the embodiment of this specification further provides a specific structure and a connection manner in the circuit, which will be described below.
Optionally, the automatic detection and protection circuit for strong electrical overvoltage may further include:
the rectifier circuit comprises a voltage stabilizing diode, a first voltage dividing resistor, a second voltage dividing resistor and a second rectifying diode; the second rectifying diode, the voltage stabilizing diode and the first voltage dividing resistor are connected in series, and one end of the second voltage dividing resistor is connected with the first voltage dividing resistor and the triode.
A Zener diode, also called a Zener diode. The diode with voltage stabilizing function is manufactured by utilizing the phenomenon that the current of the PN junction can change in a large range and the voltage is basically unchanged in the reverse breakdown state of the PN junction. Belonging to a semiconductor device having a very high resistance up to a critical reverse breakdown voltage. At the critical breakdown point, the reverse resistance is reduced to a small value, the current is increased in the low-resistance region, the voltage is kept constant, and the voltage regulator diodes are graded according to the breakdown voltage, so that the voltage regulator tubes are mainly used as voltage regulators or voltage reference elements due to the characteristic. The zener diodes can be connected in series for use at higher voltages, with higher regulated voltages being obtained by the series connection.
The voltage dividing resistor can be a resistor of a conductor connected in series in a circuit, and under the condition that the total voltage is not changed, a voltage dividing resistor is connected in series on a certain circuit and can play a role of voltage division, and a part of voltage is dropped on the voltage dividing resistor, so that the voltage at two ends of the part of circuit is reduced. The resistors generally have the functions of shunt in parallel, voltage reduction and current limitation in series and the like in the circuit.
A rectifier diode (rectifier diode) may be a semiconductor device for converting alternating current to direct current. The most important characteristic of a diode is one-way conductivity. In the circuit, current can only flow in from the anode and flow out from the cathode of the diode. Typically comprising a PN junction having positive and negative terminals.
In the circuit, a second secondary coil S2, a rectifier diode D2, a voltage stabilizing diode D3, a triode Q1/Q2 and divider resistors R1 and R2 can form an overvoltage detection circuit. The overvoltage protection circuit can comprise power supply loop protection and device protection, the power supply loop protection can comprise a thermistor RT and a relay 106, and the device protection is mainly embodied by an output signal of the overvoltage detection circuit to ensure that the device is in a turn-off state when strong current is input to overvoltage.
The thermistor 102 may be a sensor resistor whose resistance value changes with temperature. They are classified into Positive Temperature Coefficient thermistors (PTC thermistors) and Negative Temperature Coefficient thermistors (NTC thermistors) according to their Temperature coefficients. The positive temperature coefficient thermistor has a resistance value which increases with an increase in temperature, and the negative temperature coefficient thermistor has a resistance value which decreases with an increase in temperature, and is a semiconductor device. A relay is an electronic control device having a control system and a controlled system, and is generally applied to an automatic control circuit, and can be understood as a "breaker" that uses a small current to control a large current. In the present invention, the thermistor 102 may be a positive temperature coefficient thermistor.
A relay is a device that generates a transition in one or more electrical output circuits when an input (or actuation) quantity meets certain specified conditions. One end of the thermistor is connected with the power supply protection circuit 101; the relay 106 is connected in parallel with the thermistor 102; the triode switch circuit is also connected with the relay 106; the control signal output by the triode switch circuit is used for controlling the relay 106 and the device to be protected 107, and when the strong input voltage is overvoltage, the device to be protected 107 and the relay 106 are turned off.
In the above circuit structure, the thermistor 102 and the relay 106 are used, the thermistor 102 exhibits different resistance values at different temperatures, and the relay 106 can play a role in automatic regulation, safety protection, circuit switching and the like in the circuit.
Optionally, the automatic detection and protection circuit for strong electrical overvoltage may further include:
a rectifying and filtering circuit 103; one end of the rectifying and filtering circuit 103 is connected with the other end of the thermistor 102; the other end of the rectifying and filtering circuit 103 is connected to the primary coil.
The rectification can change alternating current into pulsating direct current, and the pulsating direct current is changed into smooth direct current by combining with a filter circuit to be used by an electric appliance, so that the circuit can filter out unwanted frequency components.
Optionally, the triode comprises a first triode and a second triode, and a base of the first triode is connected with the first voltage-dividing resistor and the second voltage-dividing resistor; the collector of the first triode is connected with the base of the second triode; the emitter of the second triode and the emitter of the first triode are both connected with the second divider resistor, and the collector of the second triode is connected with the device to be protected 107.
Optionally, the power protection circuit 101 includes a strong current input terminal, and one end of the primary coil is connected to the strong current input terminal of the power protection circuit 101. The relay 106 is also connected to the power protection circuit 101.
Further, the overvoltage detection circuit is embodied as a transformer 104, and the second secondary winding S2 outputs an induced voltage to drive the transistor Q1/Q2 to output the Control signal Control.
Further, the PTC thermistor RT and the relay 106 are used in parallel. The overvoltage protection circuit embodies that a Control signal Control directly controls the relay 106 and the device to be protected 107, when strong electricity is input to overvoltage, the device to be protected 107 is immediately turned off, meanwhile, the relay 106 is turned off, and the strong electricity completely passes through the PTC thermistor RT, so that the through-current capacity of the circuit is reduced, and a rear-stage circuit module is protected in real time.
With reference to fig. 1, the utility model provides a forceful electric power overvoltage automated inspection protection circuit's realization process does:
when the strong-current input voltage is in a normal range, the transformer 104 first secondary coil S1, the rectifier diode D1 and the AC-DC power supply chip 105 normally output a direct-current VCC voltage, which is provided for the subsequent circuit devices to normally work. Meanwhile, the second secondary coil S2 and the rectifier tube D2 output direct-current induced voltage, the triode Q1 is in a non-conduction state and the Q2 is in a conduction state through the voltage stabilizing diode tube D3 and the divider resistor R1/R2 which are properly selected, the Control signal Control outputs low level, the rear-stage device 107 to be protected keeps working normally, meanwhile, the relay 106 is controlled to be opened, strong electricity normally passes through the relay 106, and the whole circuit is in a normal working state.
When the strong current input exceeds the normal range, the direct current induction voltage output by the second secondary coil S2 and the rectifier tube diode D2 is increased, the triode Q1 is driven to be in a conducting state, the Q2 is in a non-conducting state, the Control signal Control outputs high level, the device to be protected 107 is directly controlled to be turned off, meanwhile, the relay 106 is controlled to be turned off, the strong current completely passes through the PTC thermistor RT, the current capacity of the circuit is reduced, and the rear-stage circuit module is protected in real time. When the strong current input voltage recovers to the normal range value, the direct current induction voltage output by the second secondary coil S2 and the rectifier tube diode D2 is reduced, the driving triode Q1 is in a non-conduction state, the Q2 is in a conduction state, the Control signal Control outputs low level, the rear-stage device to be protected 107 recovers to work normally, meanwhile, the relay 106 is controlled to be opened, strong current normally passes through the relay 106, and the whole circuit recovers to work normally.
In summary, the automatic detection and protection circuit for a strong current overvoltage of the present invention has a fast detection and protection response to the overvoltage, and realizes the detection and protection function for the strong current overvoltage. The automatic detection and protection circuit for the strong current overvoltage has the functions of automatically detecting and protecting the strong current overvoltage, and when the strong current input voltage exceeds a normal range value, the protection function can be detected and triggered immediately, so that a rear-stage overvoltage sensitive device is prevented from being burnt by overvoltage, and the effect of real-time protection is achieved. If strong current inputs overvoltage, the direct current voltage after AC-DC conversion is easy to damage the subsequent overvoltage sensitive device, so that the device fails to work. The invention relates to a circuit for automatically detecting and protecting strong electric overvoltage, which triggers an overvoltage detection circuit when strong electric input voltage exceeds a detection circuit threshold value, and protects a device 107 to be protected at the rear stage; when the strong current input voltage is lower than the threshold value of the detection circuit, the overvoltage detection circuit is automatically closed. The voltage is induced by the transformer 104 to control the triode switch circuit to realize the detection and protection functions. The device is used for real-time detection of strong current input overvoltage and real-time protection of a later stage overvoltage sensitive device.
While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
While the invention has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. An automatic detection and protection circuit for strong electric overvoltage is characterized by at least comprising:
the protection circuit comprises a power supply protection circuit, a transformer, an AC-DC power supply chip, a triode switch circuit and a device to be protected;
the transformer comprises a primary coil and a secondary coil; the secondary coil comprises a first secondary coil and a second secondary coil;
one end of the primary coil is connected with the power supply protection circuit, and the other end of the primary coil is connected with the AC-DC power supply chip; one end of the first secondary coil is connected with a first rectifying diode and the AC-DC power supply chip, and the other end of the first secondary coil is grounded; one end of the second secondary coil is connected with the triode switch circuit, and the triode switch circuit is connected with the device to be protected; the other end of the second secondary coil is grounded, and the output induced voltage is used for detecting strong current input voltage and driving a triode in the triode switch circuit to output a control signal.
2. The automatic strong overvoltage detection and protection circuit according to claim 1, further comprising:
the voltage stabilizing diode, the first divider resistor, the second divider resistor and the second rectifier diode; the second rectifying diode, the voltage stabilizing diode and the first divider resistor are connected in series, and one end of the second divider resistor is connected with the first divider resistor and the triode.
3. The automatic strong overvoltage detection and protection circuit according to claim 1, further comprising:
the protection device comprises a power supply loop protection device and a device protection device, wherein the power supply loop protection device comprises a thermistor and a relay;
the device protection is used for ensuring that the device is in an off state when strong current is input to overvoltage.
4. A strong overvoltage automatic detection and protection circuit according to claim 3, wherein one end of said thermistor is connected to said power protection circuit; the relay is connected with the thermistor in parallel;
the triode switch circuit is also connected with the relay; and the control signal output by the triode switch circuit is used for controlling the relay and the device to be protected, and when the strong-current input voltage is overvoltage, the device to be protected and the relay are switched off.
5. The automatic strong overvoltage detection and protection circuit according to claim 4, further comprising:
a rectifying and filtering circuit;
one end of the rectifying and filtering circuit is connected with the other end of the thermistor; and the other end of the rectifying and filtering circuit is connected with the primary coil.
6. The automatic strong overvoltage detection and protection circuit according to claim 2, wherein said transistor comprises a first transistor and a second transistor, and a base of said first transistor is connected to said first voltage divider resistor and said second voltage divider resistor; the collector of the first triode is connected with the base of the second triode; and the emitter of the second triode and the emitter of the first triode are both connected with the second divider resistor, and the collector of the second triode is connected with the device to be protected.
7. A strong electric overvoltage automatic detection protection circuit according to claim 3,
the thermistor is a positive temperature coefficient thermistor.
8. A strong overvoltage automatic detection protection circuit according to claim 1,
the power supply protection circuit comprises a strong current input end, and one end of the primary coil is connected with the strong current input end of the power supply protection circuit.
9. A strong current overvoltage automatic detection protection circuit according to claim 3, wherein said relay is further connected to a power supply protection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222662497.6U CN218449462U (en) | 2022-10-10 | 2022-10-10 | Strong electricity overvoltage automated inspection protection circuit |
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| CN202222662497.6U CN218449462U (en) | 2022-10-10 | 2022-10-10 | Strong electricity overvoltage automated inspection protection circuit |
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| CN218449462U true CN218449462U (en) | 2023-02-03 |
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| CN202222662497.6U Active CN218449462U (en) | 2022-10-10 | 2022-10-10 | Strong electricity overvoltage automated inspection protection circuit |
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