CN112332365A - Power supply high-voltage protection circuit and driving power supply - Google Patents
Power supply high-voltage protection circuit and driving power supply Download PDFInfo
- Publication number
- CN112332365A CN112332365A CN202010985274.6A CN202010985274A CN112332365A CN 112332365 A CN112332365 A CN 112332365A CN 202010985274 A CN202010985274 A CN 202010985274A CN 112332365 A CN112332365 A CN 112332365A
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supply
- resistor
- sampling
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
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 in direct proportion 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 under the condition that the sampling voltage is greater than the preset reference voltage, the self-locking control module is triggered to disconnect the input voltage, so that the output voltage is zero, the input voltage of the equipment can be immediately protected and self-locked when high voltage appears, and the equipment is started again after the voltage is stabilized, so that the equipment can safely and stably work.
Description
Technical Field
The invention 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, the electrical device (such as the LED driving power supply) may be damaged. The input voltage is unstable, and the input voltage is high or low, so that the equipment is unstable in operation, 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, including: 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 in direct proportion 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 under the condition that the sampling voltage is greater than the preset reference voltage, the self-locking control module is triggered to turn off the circuit, so that the output voltage is zero.
In a second aspect, a driving power supply is provided, which includes the power supply high voltage protection circuit as described in the first aspect and any possible implementation manner thereof.
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 in direct proportion 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, the sampling voltage is greater than the preset reference voltage, the self-locking control module is triggered to disconnect the input voltage to enable the output voltage to be zero, the input voltage of the equipment can be immediately protected and self-locked when high voltage appears, the equipment is started again after the voltage is stabilized, the damage to the equipment caused by the overlarge input voltage is prevented, and the equipment can safely work.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
Fig. 1 is a schematic structural diagram of a power supply high-voltage protection circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another power supply high-voltage protection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another power supply high-voltage protection circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another power supply high-voltage protection circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another power supply high-voltage protection circuit according to an embodiment of the present disclosure;
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 technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively 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 can be included in at least one embodiment of the application. 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The embodiments of the present application will be described below with reference to the drawings.
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 present disclosure. 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 over-voltage sampling module 110 is configured to generate an input voltage, collect a sampling voltage proportional to the input voltage, and input the sampling voltage to the voltage comparison module 120;
the voltage comparing module 120 is configured to compare the sampled voltage with a preset reference voltage, and trigger the automatic lock control module 130 to disconnect the circuit when the sampled voltage is greater than the preset reference voltage, so that the output voltage is zero.
In the embodiment of the present application, the step of disconnecting the circuit refers to disconnecting 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 an output voltage of the power high-voltage protection circuit 100, and is also an input voltage provided to an external circuit, which is understood to be a working voltage for maintaining an external circuit.
In many electrical devices, the input voltage is required to be within a certain range, and if the input voltage exceeds the electrical device (such as an LED driving power supply), the device will be damaged. If the input voltage is unstable, the input voltage is suddenly high or low, the equipment can also 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 electrical equipment, can be protected and locked when high voltage occurs to input voltage, and is started again after the input voltage is stable, so that the damage of equipment with overlarge voltage is prevented, and the safe operation of the equipment is ensured.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another power high-voltage protection circuit according to an embodiment of the present disclosure. 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 connected in pairs;
on the basis of the embodiment shown in fig. 1, the power over-voltage 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 configured to rectify and filter 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 used for dividing the input voltage to collect the sampling voltage proportional to the input voltage, and inputting the sampling voltage to the voltage comparison module 220.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another power supply high-voltage protection circuit according to an embodiment of the present disclosure. As shown in fig. 3, the power source high voltage protection circuit 300 includes a power source overvoltage sampling module 310, a voltage comparison module 320 and a self-locking control module 330 connected in pairs, wherein:
on the basis of 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 over-voltage sampling module 310 comprises a first resistor R1 and a first zener diode ZD 1; 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 over-voltage 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 terminal of the rectifier bridge D1 and the auto-lock 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 terminal of the voltage comparison module 320, so as to provide the sampled voltage to the voltage comparison module 320.
Alternatively, as shown in fig. 3, the rectifier bridge D1 may include four diodes;
the negative electrode of the first diode is connected with the positive electrode of the second diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrodes of the first diode and the third diode are grounded; a cathode of the first diode and a cathode of the third diode are input terminals (L, N in the drawing) of the rectifier bridge, and an anode of the second diode and an anode of the fourth diode are output terminals of the rectifier bridge.
Other rectifier bridge structures may be selected according to the requirement 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 present disclosure. As shown in fig. 4, the power supply high voltage protection circuit 400 includes a power supply overvoltage sampling module 410, a voltage comparison module 420 and a self-locking control module 430 connected in pairs, wherein:
the voltage comparing module 420 includes a comparator a;
the input end of the voltage comparing 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 supply 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, a control voltage is output (at a pin 7) from an output terminal, and the unlocking control module 430 is triggered to open a 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 power supply terminal (pin 8) of the comparator a to supply 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 present application, other circuit elements may be selected or other circuit structures may be arranged as needed to provide the reference voltage Vr for the negative input terminal (pin 6) of the comparator a, which is not limited herein;
the self-lock 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 switch unit 431 according to the control voltage, and the switch unit 431 is configured to switch an on/off state of a circuit according to the control signal.
The switching unit 431 may select any type of relay. A relay (relay) is an electric control device that generates a predetermined step change in a controlled amount in an electric output circuit when a change in an input amount (excitation amount) meets a predetermined requirement. It has an interactive relationship between a control system (also called an input loop) and a controlled system (also called an output loop). It is commonly used in automated control circuits, which are actually a "recloser" that uses low current to control high current operation. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like.
Further alternatively, reference may be made to a schematic structural diagram of another power supply high-voltage protection circuit shown in fig. 5. As shown in fig. 5, the power supply high voltage protection circuit 500 includes a power supply overvoltage sampling module 510, a voltage comparison module 520, and a self-locking control module 530 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;
wherein, the base of the first triode Q1 is connected to the output terminal of the voltage comparison module 520; an emitter of the second transistor Q2 is connected to an input voltage, a collector of the second transistor Q2 is connected to a negative electrode of the second diode D2, and a positive electrode of the second diode D2 is connected to an emitter of the first transistor Q1 and grounded;
both ends of the sixth resistor R6 are connected to the base of the first transistor Q1 and the collector of the second transistor Q2, respectively; both ends of the seventh resistor R7 are connected to the collector of the first transistor Q1 and the base of the second transistor Q2, respectively;
the relay b is connected in parallel to 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 present invention, the power voltage sampling module 510 generates the output voltage.
Optionally, the first transistor Q1 may be an NPN transistor, and the second transistor Q2 may be a PNP transistor.
Referring to fig. 6, fig. 6 is a schematic structural diagram of another power high-voltage protection circuit according to an embodiment of the present disclosure. As shown in fig. 6, the power supply high voltage protection circuit 600 can be seen as including a power supply 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 is 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 ZD 1; 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 over-voltage sampling module 610 further 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 terminal of the rectifier bridge D1 and the auto-lock 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 terminal of the voltage comparison module 320, so as to provide the sampled voltage to the voltage comparison module 320.
2. A voltage comparison module 620, comprising:
a comparator a, a fourth resistor R4 and a fifth resistor R5;
the input end of the voltage comparing 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 supply 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 power supply terminal (pin 8) of the comparator a to supply 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, a control voltage is output (at pin 7) from an output terminal, and the unlocking control module 430 is triggered to open a circuit, so that the output voltage is zero.
3. An auto-lock control module 630, comprising:
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 of the first triode Q1 is connected to the output terminal of the comparator a; an emitter of the second transistor Q2 is connected to an input voltage, a collector of the second transistor Q2 is connected to a negative electrode of the second diode D2, and a positive electrode of the second diode D2 is connected to an emitter of the first transistor Q1 and grounded;
both ends of the sixth resistor R6 are connected to the base of the first transistor Q1 and the collector of the second transistor Q2, respectively; both ends of the seventh resistor R7 are connected to the collector of the first transistor Q1 and the base of the second transistor Q2, respectively;
the relay b is connected in parallel to 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 in the embodiment of the present application, the power supply overvoltage sampling module 610 includes a rectifier bridge D1 and a capacitor C1 to form a rectifier filter, and a resistor R1 and a zener diode ZD1 provide VCC voltage; then, the voltage is divided by resistors R2 and R3 to generate a sampling voltage; at the voltage comparison module 620, the sampled voltage is input to the positive terminal pin 5 of comparator a. The negative terminal 6 of the comparator a is set with a reference voltage Vr by VCC and resistors R4 and 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 values set by the R4 and R5, the output pin 7 of the comparator a outputs a relative high voltage to make the Q1 in saturated conduction, the Q2 is also conducted after the Q1 is conducted, the relay B is connected to the A point from the B point, the rectifier voltage circuit is disconnected, and no voltage output is protected.
In the embodiment of the application, the self-locking principle of the power supply high-voltage protection circuit comprises: when high voltage appears in input to protect the circuit, the high level of the collector (C pole) of Q2 is fed back to the base of Q1 from R6 after Q1 and Q2 are turned on, so that Q1 can maintain high voltage all the time even if the high voltage output by pin 7 of comparator is not available, so as to continuously maintain Q1 to be turned on and Q2 to be turned on, the relay B is turned on from point B to point A, the rectification voltage circuit is turned off, and no voltage output is protected.
The power supply high-voltage protection circuit in the embodiment of the application can protect and lock when high voltage appears in input voltage, namely, the circuit is disconnected to enable no output voltage, and the circuit is connected again after the input voltage is stable, so that the input voltage of equipment (such as an LED driving power supply) is stable, and the equipment can work safely.
In an optional implementation manner, the power supply high-voltage protection circuit can be applied to a driving power supply of any electrical equipment, and can realize the protection and self-locking functions under the condition of providing driving current and voltage for the electrical equipment, namely in the electrical equipment, when high voltage occurs to input voltage, the circuit is disconnected, no output voltage exists, the input voltage is not provided for the electrical equipment, and the circuit is connected again after the input voltage is stable, so that the damage of the equipment with overlarge voltage is prevented, and the stability of the input voltage of the equipment is ensured, so that the equipment can work safely.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the division of the module is only one logical division, and other divisions may be possible in actual implementation, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. The shown or discussed mutual coupling, direct coupling or communication connection may be an indirect coupling or communication connection of devices or modules through some interfaces, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on 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 the present embodiment.
Claims (10)
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 in direct proportion 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 under the condition that the sampling voltage is greater than the preset reference voltage, the self-locking control module is triggered to turn off the circuit, so that the output voltage is zero.
2. The power supply high voltage protection circuit according to claim 1, wherein the power supply overvoltage sampling module comprises:
the device comprises a rectification filtering unit, a voltage generating unit and a voltage sampling unit;
the rectification filtering unit is used for rectifying the alternating current into direct current and filtering; the voltage generating 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 collect the sampling voltage in direct proportion to the input voltage and inputting the sampling voltage to the voltage comparison module.
3. The power supply high voltage protection circuit according to claim 2, wherein the rectifying and filtering unit comprises a rectifying 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 voltage stabilizing 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 voltage stabilizing diode, and the anode of the first voltage stabilizing diode is grounded;
the voltage sampling unit comprises a second resistor and a third resistor; the second resistor is connected with the third resistor in series, 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, and the other end of the second resistor is connected with the input end of the voltage comparison module to provide the sampling voltage for the voltage comparison module.
4. The power supply high voltage protection circuit according to claim 3, wherein the rectifier bridge comprises four diodes;
the negative electrode of the first diode is connected with the positive electrode of the second diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrodes of the first diode and 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 positive electrode of the second diode and the positive electrode of the fourth diode are output ends of the rectifier bridge.
5. The power supply high voltage protection circuit according to any one of claims 1-4, 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 under the condition that the sampling voltage is greater than the reference voltage, the output end outputs control voltage to trigger the self-locking control module circuit-breaking circuit, and the output voltage is zero.
6. The power supply high voltage protection circuit according to claim 5, wherein the voltage comparison module further comprises a fourth resistor and a fifth resistor;
the fourth resistor and the fifth resistor are connected in series, one end of the fourth resistor is grounded, and one end of the fifth resistor is connected with a negative side power supply end of the comparator to provide a power supply voltage of the comparator; the other end of the fifth resistor is connected with the negative input end of the comparator to provide the reference voltage for the negative input end of the comparator.
7. The power supply high voltage protection circuit according to claim 5 or 6, wherein the self-locking control module comprises a switch unit and a control unit;
wherein 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.
8. The power supply high voltage protection circuit according to claim 7, wherein the switching unit includes a relay and a second diode, and the control unit includes a first transistor, a second transistor, a sixth resistor and a seventh resistor;
the base electrode of the first triode is connected with the output end of the comparator; an emitting electrode of the second triode is connected with input voltage, a collector electrode of the second triode is connected with a negative electrode of the second diode, and a positive electrode of the second diode is connected with the emitting electrode 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 of the first triode and the base 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.
9. The power supply high voltage protection circuit according to claim 8, wherein the first transistor is an NPN transistor, and the second transistor is a PNP transistor.
10. A driving power supply comprising the power supply high voltage protection circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010985274.6A CN112332365B (en) | 2020-09-18 | 2020-09-18 | Power supply high-voltage protection circuit and driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010985274.6A CN112332365B (en) | 2020-09-18 | 2020-09-18 | Power supply high-voltage protection circuit and driving power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112332365A true CN112332365A (en) | 2021-02-05 |
| CN112332365B CN112332365B (en) | 2023-10-10 |
Family
ID=74303108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010985274.6A Active CN112332365B (en) | 2020-09-18 | 2020-09-18 | Power supply high-voltage protection circuit and driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112332365B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877545A (en) * | 2009-04-30 | 2010-11-03 | 鸿富锦精密工业（深圳）有限公司 | Power module |
| 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 |
-
2020
- 2020-09-18 CN CN202010985274.6A patent/CN112332365B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877545A (en) * | 2009-04-30 | 2010-11-03 | 鸿富锦精密工业（深圳）有限公司 | Power module |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112332365B (en) | 2023-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9667055B2 (en) | Over-voltage protection apparatus and method of operating the same | |
| CN109342973B (en) | Direct current power supply input state monitoring circuit and system | |
| US20200195004A1 (en) | Current protection circuit and method for high voltage system | |
| CN111224374B (en) | Protective circuit | |
| CN201312113Y (en) | Over-voltage and under-voltage protection circuit for vehicle electrical appliance | |
| HU225080B1 (en) | Voltage regulator arrangement | |
| CN112332365A (en) | Power supply high-voltage protection circuit and driving power supply | |
| CN108270199B (en) | Output overvoltage protection circuit | |
| CN111049101A (en) | Overvoltage protection circuit | |
| JP2012244716A (en) | Protection circuit and electronic apparatus | |
| CN214412262U (en) | Protection circuit, circuit board and protection system | |
| CN111009958B (en) | Power supply control circuit | |
| CN210137202U (en) | Battery protection circuit and robot | |
| CN210297565U (en) | Alternating current-direct current wide input voltage regulating circuit and driver | |
| CN113162011A (en) | Overvoltage protection circuit and power supply circuit | |
| JPH08182315A (en) | Switching power source | |
| CN211405479U (en) | Non-polar power interface circuit and power supply assembly | |
| CN217848936U (en) | Power switch circuit designed by electronic components | |
| CN218867909U (en) | Short-circuit protection circuit, port power supply and electronic equipment | |
| CN216413915U (en) | Over-voltage and under-voltage protection circuit | |
| CN219181182U (en) | Overvoltage protection circuit | |
| CN215498719U (en) | Power supply circuit for automatic identification and switching of ACDC (automatic call control computer) same-port input | |
| CN212969049U (en) | Circuit protection device | |
| CN211908345U (en) | Input overvoltage and output overcurrent protection circuit | |
| JP2004254388A (en) | Power supply detecting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |