CN112332365B - Power supply high-voltage protection circuit and driving power supply - Google Patents
Power supply high-voltage protection circuit and driving power supply Download PDFInfo
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- CN112332365B CN112332365B CN202010985274.6A CN202010985274A CN112332365B CN 112332365 B CN112332365 B CN 112332365B CN 202010985274 A CN202010985274 A CN 202010985274A CN 112332365 B CN112332365 B CN 112332365B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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Abstract
The application discloses a power supply high-voltage protection circuit and a driving power supply, wherein the power supply high-voltage protection circuit comprises a power supply overvoltage sampling module, a voltage comparison module and a self-locking control module which are connected in pairs; the power supply overvoltage sampling module is used for generating input voltage, collecting sampling voltage proportional to the input voltage and inputting the sampling voltage to the voltage comparison module; the voltage comparison module is used for comparing the sampling voltage with a preset reference voltage, and triggering the self-locking control module to disconnect the input voltage under the condition that the sampling voltage is larger than the preset reference voltage, so that the output voltage is zero, the device can be immediately protected and self-locked when the input voltage of the device is high, and the device is started again after the voltage is stable, so that the device can safely and stably work.
Description
Technical Field
The application relates to the field of electronic circuits, in particular to a power supply high-voltage protection circuit and a driving power supply.
Background
Generally, the input voltage of the driving power supply has a certain range, and if the input voltage exceeds an acceptable level, electrical equipment (such as an LED driving power supply) may be damaged. The input voltage is unstable and suddenly rises and falls, so that the equipment can work unstably and the power supply is easy to damage.
Disclosure of Invention
The application provides a power supply high-voltage protection circuit, a device, electronic equipment and a medium.
In a first aspect, a power supply high voltage protection circuit is provided, comprising: the power supply overvoltage sampling module, the voltage comparison module and the self-locking control module are connected in pairs;
the power supply overvoltage sampling module is used for generating input voltage, collecting sampling voltage proportional to the input voltage and inputting the sampling voltage to the voltage comparison module;
the voltage comparison module is used for comparing the sampling voltage with a preset reference voltage, and triggering the self-locking control module to disconnect a circuit under the condition that the sampling voltage is larger than the preset reference voltage so as to enable the output voltage to be zero.
In a second aspect, there is provided a drive power supply comprising a power supply high voltage protection circuit as in the first aspect and any one of its possible implementations.
The power supply high-voltage protection circuit comprises a power supply overvoltage sampling module, a voltage comparison module and a self-locking control module which are connected in pairs; the power supply overvoltage sampling module is used for generating input voltage, collecting sampling voltage proportional to the input voltage and inputting the sampling voltage to the voltage comparison module; the voltage comparison module is used for comparing the sampling voltage with a preset reference voltage, and triggering the self-locking control module to disconnect the input voltage under the condition that the sampling voltage is larger than the preset reference voltage, so that the output voltage is zero, the device can be immediately protected and self-locked when the input voltage of the device is high, the device is started again until the voltage is stable, the damage to the device caused by the overlarge input voltage is prevented, and the device is enabled to work safely.
Drawings
In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.
Fig. 1 is a schematic structural diagram of a power supply high-voltage protection circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another power supply high voltage protection circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another power supply high voltage protection circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another power supply high voltage protection circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of another power supply high voltage protection circuit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another power supply high voltage protection circuit according to an embodiment of the present application.
Detailed Description
In order to make the present application better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases 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 skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply high voltage protection circuit according to an embodiment of the application. The power supply high-voltage protection circuit 100 comprises a power supply overvoltage sampling module 110, a voltage comparison module 120 and a self-locking control module 130 which are connected in pairs;
the power supply overvoltage sampling module 110 is configured to generate an input voltage, collect a sampled voltage proportional to the input voltage, and input the sampled voltage to the voltage comparing module 120;
the voltage comparison module 120 is configured to compare the sampled voltage with a preset reference voltage, and trigger the self-locking control module 130 to disconnect the circuit and make the output voltage zero when the sampled voltage is greater than the preset reference voltage.
The interruption of the circuit in the embodiment of the present application refers to the disconnection of the external circuit of the power high voltage protection circuit 100, so that the power supply no longer supplies power to the external circuit. The output voltage is the output voltage of the power high voltage protection circuit 100, and is also the input voltage provided to the external circuit, and is understood to be the operating voltage for maintaining the external circuit.
In many electrical devices, the input voltage has a range requirement that if the input voltage exceeds the electrical device (e.g., LED drive power supply) the device will be damaged. If the input voltage is unstable, the equipment can work unstably and the power supply is easy to damage. The power supply high-voltage protection circuit 100 in the embodiment of the application can be used in electrical equipment or a driving power supply circuit of the electrical equipment, can protect and lock when the input voltage is high, and can be started again until the input voltage is stable, so that the equipment with overlarge voltage is prevented from being damaged, and the safe operation of the equipment is ensured.
Referring to fig. 2, fig. 2 is a schematic diagram of another power supply high voltage protection circuit according to an embodiment of the application. As shown in fig. 2, the power supply high voltage protection circuit 200 is similar to the power supply high voltage protection circuit 200 in fig. 1, and includes a power supply overvoltage sampling module 210, a voltage comparison module 220 and a self-locking control module 230, which are connected in pairs;
on the basis of the embodiment shown in fig. 1, the power supply overvoltage sampling module 210 includes a rectifying and filtering unit 211, a voltage generating unit 212 and a voltage sampling unit 213, which are respectively connected;
the rectifying and filtering unit 211 is used for rectifying and filtering the alternating current into direct current;
the voltage generating unit 212 is configured to generate the input voltage based on the signal filtered by the rectifying and filtering unit 211; in one embodiment, the input voltage may be a supply voltage provided to the circuit;
the voltage sampling unit 213 is configured to divide the input voltage to collect the sampled voltage proportional to the input voltage, and input the sampled voltage to the voltage comparing module 220.
Referring to fig. 3, fig. 3 is a schematic diagram of another power supply high voltage protection circuit according to an embodiment of the application. As shown in fig. 3, the power high voltage protection circuit 300 includes a power overvoltage sampling module 310, a voltage comparison module 320, and a self-locking control module 330, which are connected in pairs, wherein:
based on the embodiment shown in fig. 2, the rectifying and filtering unit of the power supply overvoltage sampling module 310 includes a rectifying bridge D1 and a first capacitor C1; an input end L, N of the rectifier bridge D1 is connected to an ac power supply, an output end O of the rectifier bridge D1 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded;
the voltage generating unit of the power supply overvoltage sampling module 310 comprises a first resistor R1 and a first zener diode ZD1; one end of the first resistor R1 is connected to the output end of the rectifier bridge D1, the other end of the first resistor R1 is connected to the negative electrode of the first zener diode ZD1, and the positive electrode of the first zener diode ZD1 is grounded;
the voltage sampling unit of the power supply overvoltage sampling module 310 comprises a second resistor R2 and a third resistor R3; the second resistor R2 and the third resistor R3 are connected in series, one end of the third resistor R3 is connected to the output end of the rectifier bridge D1 and the self-locking control module 330, one end of the second resistor R2 is grounded, and the other end of the second resistor R2 is connected to the input end of the voltage comparison module 320 to provide the sampling voltage to the voltage comparison module 320.
Alternatively, as shown in fig. 3, the rectifier bridge D1 may include four diodes;
wherein, the negative pole of the first diode is connected with the positive pole of the second diode, the negative pole of the third diode is connected with the positive pole of the fourth diode, the negative pole of the first diode is grounded with the negative pole of the third diode; the negative electrode of the first diode and the negative electrode of the third diode are input ends (i.e., L, N in the drawing) of the rectifier bridge, and the positive electrode of the second diode and the positive electrode of the fourth diode are output ends of the rectifier bridge.
Other rectifier bridge structures may be selected according to the need in the embodiment of the present application, or other circuit elements may be selected to replace the rectifier bridge D1 portion in the embodiment of the present application to provide the input current, which is not limited herein.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another power supply high voltage protection circuit according to an embodiment of the application. As shown in fig. 4, the power high voltage protection circuit 400 includes a power overvoltage sampling module 410, a voltage comparison module 420 and a self-locking control module 430, which are connected in pairs, wherein:
the voltage comparison module 420 includes a comparator a;
the input end of the voltage comparison module 420 is the positive input end (pin 5) of the comparator a; the voltage of the negative input end (pin 6) of the comparator a is the reference voltage Vr, and the negative side power end (pin 8) of the comparator a is grounded;
the output end (pin 7) of the comparator a is connected with the self-locking control module 430; the comparator a is configured to compare the sampling voltage with the reference voltage Vr, so that when the sampling voltage is greater than the reference voltage Vr, the output terminal (pin 7) outputs a control voltage, and the self-locking control module 430 is triggered to disconnect the circuit, so that the output voltage is zero;
optionally, the voltage comparison module 420 further includes a fourth resistor R4 and a fifth resistor R5;
the fourth resistor R4 and the fifth resistor R5 are connected in series, one end of the fourth resistor R4 is grounded, and one end of the fifth resistor R5 is connected to the negative side power supply terminal (pin 8) of the comparator a to provide the power supply voltage of the comparator a; the other end of the fifth resistor R5 is connected to the negative input terminal (pin 6) of the comparator a to supply the reference voltage Vr to the negative input terminal (pin 6) of the comparator a.
In the embodiment of the application, other circuit elements or other circuit structures can be selected or arranged according to the requirement to provide the reference voltage Vr for the negative input end (pin 6) of the comparator a, and the reference voltage Vr is not limited herein;
the self-locking control module 430 may include a switch unit 431 and a control unit 432; the control unit 432 is connected to the output terminal of the comparator a and the switching unit 431; the control unit 432 is configured to adjust a control signal input to the switching unit 431 according to the control voltage, and the switching unit 431 is configured to switch an on-off state of the circuit according to the control signal.
The switching unit 431 may select any type of relay. A relay (relay) is an electric control device, and is an electric appliance that generates a predetermined step change in a controlled amount in an electric output circuit when a change in an input amount (excitation amount) reaches a prescribed requirement. It has an interactive relationship between the control system (also called input loop) and the controlled system (also called output loop). It is commonly used in automated control circuits and is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, the circuit plays roles of automatic regulation, safety protection, circuit switching and the like.
Further alternatively, reference may be made to a schematic structural diagram of a further power supply high voltage protection circuit shown in fig. 5. As shown in fig. 5, the power high voltage protection circuit 500 includes a power overvoltage sampling module 510, a voltage comparison module 520, and a self-locking control module 530, which are connected in pairs, wherein:
specifically, as shown in fig. 5, the switching unit includes a relay b and a second diode D2, and the control unit includes a first transistor Q1, a second transistor Q2, a sixth resistor R6, and a seventh resistor R7;
the base electrode of the first triode Q1 is connected with the output end of the voltage comparison module 520; an emitter of the second triode Q2 is connected with an input voltage, a collector of the second triode Q2 is connected with a cathode of the second diode D2, and an anode of the second diode D2 is connected with an emitter of the first triode Q1 and grounded;
two ends of the sixth resistor R6 are respectively connected with the base electrode of the first triode Q1 and the collector electrode of the second triode Q2; two ends of the seventh resistor R7 are respectively connected with the collector electrode of the first triode Q1 and the base electrode of the second triode Q2;
the relay b is connected in parallel with the second diode D2; the relay b is used for controlling the opening and closing of the switch and the contact according to the control signal so as to control the output voltage. In the embodiment of the application, the power supply voltage sampling module 510 generates the output voltage.
Optionally, the first transistor Q1 may be an NPN transistor, and the second transistor Q2 is a PNP transistor.
Referring to fig. 6, fig. 6 is a schematic diagram of a power supply high voltage protection circuit according to another embodiment of the application. As shown in fig. 6, the power high voltage protection circuit 600 may be considered to include a power overvoltage sampling module 610, a voltage comparison module 620, and a self-locking control module 630, wherein:
1. a power supply overvoltage sampling module 610, comprising:
a rectifier bridge D1 and a first capacitor C1; an input end L, N of the rectifier bridge D1 can be connected to an ac power supply, an output end O of the rectifier bridge D1 is connected to one end 1 of the first capacitor C1, and the other end 2 of the first capacitor C1 is grounded;
a first resistor R1 and a first zener diode ZD1; one end of the first resistor R1 is connected to the output end of the rectifier bridge D1, the other end of the first resistor R1 is connected to the negative electrode of the first zener diode ZD1, and the positive electrode of the first zener diode ZD1 is grounded;
the power supply overvoltage sampling module 610 further includes a second resistor R2 and a third resistor R3; the second resistor R2 and the third resistor R3 are connected in series, one end of the third resistor R3 is connected to the output end of the rectifier bridge D1 and the self-locking control module 330, one end of the second resistor R2 is grounded, and the other end of the second resistor R2 is connected to the input end of the voltage comparison module 320 to provide the sampling voltage to the voltage comparison module 320.
2. The voltage comparison module 620 includes:
a comparator a, a fourth resistor R4 and a fifth resistor R5;
the input end of the voltage comparison module 420 is the positive input end (pin 5) of the comparator a; the voltage of the negative input end (pin 6) of the comparator a is the reference voltage Vr, and the negative side power end (pin 8) of the comparator a is grounded;
the fourth resistor R4 and the fifth resistor R5 are connected in series, one end of the fourth resistor R4 is grounded, and one end of the fifth resistor R5 is connected to the negative side power supply terminal (pin 8) of the comparator a to provide the power supply voltage of the comparator a; the other end of the fifth resistor R5 is connected to the negative input terminal (pin 6) of the comparator a to supply the reference voltage Vr to the negative input terminal (pin 6) of the comparator;
the output end (pin 7) of the comparator a is connected with the self-locking control module 430; the comparator a is configured to compare the sampling voltage with the reference voltage Vr, so that when the sampling voltage is greater than the reference voltage Vr, the output terminal (pin 7) outputs a control voltage, and the self-locking control module 430 is triggered to disconnect the circuit, so that the output voltage is zero.
3. The self-locking control module 630 includes:
the relay b, the second diode D2, the first triode Q1, the second triode Q2, the sixth resistor R6 and the seventh resistor R7;
the base electrode of the first triode Q1 is connected with the output end of the comparator a; an emitter of the second triode Q2 is connected with an input voltage, a collector of the second triode Q2 is connected with a cathode of the second diode D2, and an anode of the second diode D2 is connected with an emitter of the first triode Q1 and grounded;
two ends of the sixth resistor R6 are respectively connected with the base electrode of the first triode Q1 and the collector electrode of the second triode Q2; two ends of the seventh resistor R7 are respectively connected with the collector electrode of the first triode Q1 and the base electrode of the second triode Q2;
the relay b is connected in parallel with the second diode D2; the relay b is used for controlling the opening and closing of the switch and the contact according to the control signal output by the voltage comparison module 620 so as to control the output voltage.
Specifically, in the power supply high voltage protection circuit 600 according to the embodiment of the present application, the power supply overvoltage sampling module 610 includes a rectifying bridge D1 and a capacitor C1 to form a rectifying filter, and the resistor R1 and the zener diode ZD1 provide VCC voltage; then dividing the voltage by resistors R2 and R3 to generate a sampling voltage; at voltage comparison module 620, the sampled voltage is input to pin 5 of positive terminal of comparator a. The negative terminal 6 pin of the comparator a is set to a reference voltage Vr by VCC and resistors R4, R5. The self-locking control module 630 is composed of a self-locking circuit triode Q1, a triode Q2, a resistor R6, a resistor R7, a diode D2 and a relay b.
The protection principle of the power supply high voltage protection circuit 600 includes: when the input voltage is too high, the R2 and R3 sampling voltages rectified by the rectifier bridge D1 rise, when the value of the sampling voltage is larger than the reference value set by R4 and R5, the output pin 7 of the comparator a outputs relative high voltage to enable Q1 to be saturated and conducted, Q2 is also conducted after Q1 is conducted, the relay B is connected from the point B to the point A, and the rectifier voltage circuit is disconnected to protect no-voltage output.
In the embodiment of the application, the self-locking principle of the power supply high-voltage protection circuit comprises the following steps: when the input is high voltage to protect the circuit, the high level of the collector (C electrode) of the Q2 is fed back to the base electrode of the Q1 from the R6 after the Q1 and the Q2 are conducted, so that the Q1 can always maintain high voltage even if the high voltage output by the pin 7 of the comparator is not available, the Q1 is continuously maintained to be conducted and the Q2 is conducted, the relay B is connected from the point B to the point A, the rectifying voltage circuit is disconnected, and no voltage output is protected.
The power supply high-voltage protection circuit in the embodiment of the application can protect and lock when the input voltage is high, namely, the circuit is disconnected to ensure that no output voltage exists, the circuit is connected again after the input voltage is stabilized, and the input voltage of equipment (such as an LED driving power supply) is ensured to be stabilized, so that the equipment works safely.
In an optional implementation manner, the power supply high-voltage protection circuit can be applied to a driving power supply of any electric equipment, and can realize the functions of protection and self-locking under the condition of providing driving current and voltage for the electric equipment, namely, in the electric equipment, when the input voltage is high, the circuit is disconnected, no output voltage exists, the input voltage is not provided for the electric equipment, and the circuit is connected again until the input voltage is stable, so that the damage of equipment with excessive voltage is prevented, the input voltage of the equipment is ensured to be stable, and the equipment can safely work.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the division of the module is merely a logical function division, and there may be another division manner when actually implemented, for example, a plurality of modules or components may be combined or may be integrated into another system, or some features may be omitted or not performed. The coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or module indirect coupling or communication connection, which may be in electrical, mechanical, or other form.
The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Claims (6)
1. The power supply high-voltage protection circuit is characterized by comprising a power supply overvoltage sampling module, a voltage comparison module and a self-locking control module which are connected in pairs;
the power supply overvoltage sampling module is used for generating input voltage, collecting sampling voltage proportional to the input voltage and inputting the sampling voltage to the voltage comparison module;
the voltage comparison module is used for comparing the sampling voltage with a preset reference voltage, and triggering the self-locking control module to disconnect a circuit under the condition that the sampling voltage is larger than the preset reference voltage so as to enable the output voltage to be zero;
wherein, the power overvoltage sampling module includes:
the device comprises a rectification filtering unit, a voltage generating unit and a voltage sampling unit;
the rectification and filtering unit is used for rectifying and filtering alternating current into direct current; the voltage generation unit is used for generating the input voltage based on the signal filtered by the rectifying and filtering unit;
the voltage sampling unit is used for dividing the input voltage to acquire the sampling voltage proportional to the input voltage and inputting the sampling voltage to the voltage comparison module;
wherein the voltage comparison module comprises a comparator;
the input end of the voltage comparison module is the positive input end of the comparator; the voltage of the negative input end of the comparator is the reference voltage;
the output end of the comparator is connected with the self-locking control module; the comparator is used for comparing the sampling voltage with the reference voltage so that the output end outputs control voltage under the condition that the sampling voltage is larger than the reference voltage, and the self-locking control module is triggered to disconnect a circuit to enable the output voltage to be zero;
the self-locking control module comprises a switch unit and a control unit;
the control unit is connected with the output end of the comparator and the switch unit;
the control unit is used for adjusting a control signal input into the switch unit according to the control voltage, and the switch unit is used for switching the on-off state of the circuit according to the control signal;
the switch unit comprises a relay and a second diode, and the control unit comprises a first triode, a second triode, a sixth resistor and a seventh resistor;
the base electrode of the first triode is connected with the output end of the comparator; the emitter of the second triode is connected with input voltage, the collector of the second triode is connected with the cathode of the second diode, and the anode of the second diode is connected with the emitter of the first triode and grounded;
two ends of the sixth resistor are respectively connected with the base electrode of the first triode and the collector electrode of the second triode; two ends of the seventh resistor are respectively connected with the collector electrode of the first triode and the base electrode of the second triode;
the relay is connected with the second diode in parallel; the relay is used for controlling the opening and closing of the switch and the contact according to the control signal so as to control the output voltage.
2. The power supply high voltage protection circuit of claim 1, wherein the rectifying and filtering unit comprises a rectifier bridge and a first capacitor; the input end of the rectifier bridge is connected with an alternating current power supply, the output end of the rectifier bridge is connected with one end of the first capacitor, and the other end of the first capacitor is grounded;
the voltage generating unit comprises a first resistor and a first zener diode; one end of the first resistor is connected with the output end of the rectifier bridge, the other end of the first resistor is connected with the cathode of the first zener diode, and the anode of the first zener diode is grounded;
the voltage sampling unit comprises a second resistor and a third resistor; the second resistor is connected in series with the third resistor, one end of the third resistor is connected with the output end of the rectifier bridge and the self-locking control module, one end of the second resistor is grounded, the other end of the third resistor is connected with the other end of the second resistor, and the other end of the second resistor is also connected with the input end of the voltage comparison module so as to provide the sampling voltage for the voltage comparison module.
3. The power supply high voltage protection circuit of claim 2, wherein the rectifier bridge comprises four diodes;
the cathode of the first diode is connected with the anode of the second diode, the cathode of the third diode is connected with the anode of the fourth diode, and the anode of the first diode and the anode of the third diode are grounded; the negative electrode of the first diode and the negative electrode of the third diode are input ends of the rectifier bridge, and the negative electrode of the second diode and the negative electrode of the fourth diode are output ends of the rectifier bridge.
4. The power supply high voltage protection circuit of claim 1, wherein the voltage comparison module further comprises a fourth resistor and a fifth resistor;
the fourth resistor is connected in series with the fifth resistor, one end of the fourth resistor is grounded, the other end of the fourth resistor is electrically connected with one end of the fifth resistor, and one end of the fifth resistor is also connected with a negative side power supply end of the comparator to provide the power supply voltage of the comparator; the other end of the fifth resistor is connected with the negative input end of the comparator so as to provide the reference voltage for the negative input end of the comparator.
5. The power supply high voltage protection circuit of claim 1, wherein the first transistor is an NPN transistor and the second transistor is a PNP transistor.
6. A driving power supply comprising the power supply high voltage protection circuit according to any one of claims 1 to 5.
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| CN202010985274.6A CN112332365B (en) | 2020-09-18 | 2020-09-18 | Power supply high-voltage protection circuit and driving power supply |
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| CN202010985274.6A CN112332365B (en) | 2020-09-18 | 2020-09-18 | Power supply high-voltage protection circuit and driving power supply |
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| CN112332365B true CN112332365B (en) | 2023-10-10 |
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| CN105449633A (en) * | 2015-11-11 | 2016-03-30 | 绵阳市维博电子有限责任公司 | Over/under voltage protection system of electrical equipment |
| CN108039695A (en) * | 2017-11-17 | 2018-05-15 | 深圳市科比特航空科技有限公司 | Overvoltage crowbar |
| CN111436174A (en) * | 2018-12-25 | 2020-07-21 | 中山市牛宝电子科技有限公司 | High-efficient constant current drive power supply equipment |
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| CN112332365A (en) | 2021-02-05 |
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