CN111355214B - Voltage surge protection system - Google Patents
Voltage surge protection system Download PDFInfo
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- CN111355214B CN111355214B CN201811562398.2A CN201811562398A CN111355214B CN 111355214 B CN111355214 B CN 111355214B CN 201811562398 A CN201811562398 A CN 201811562398A CN 111355214 B CN111355214 B CN 111355214B
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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
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
The invention provides a voltage surge protection system, comprising: a voltage surge detection control circuit and a surge protection switch circuit; the first end of the voltage surge detection control circuit is connected with the power input end and is used for performing front-end surge detection; the second end of the voltage surge detection control circuit is connected with the control end of the surge protection switch circuit and is used for controlling the surge protection switch circuit according to the front-end surge detection result; the surge protection switch circuit is arranged between the power output end and a circuit device needing surge protection and is used for performing back-end surge protection under the control of the voltage surge detection control circuit. The voltage surge protection system provided by the invention adopts the modes of front-end surge detection and rear-end surge protection control, fully utilizes the inherent delay from the power input end to the power output end, counteracts the response time of the voltage surge detection control circuit and the surge protection switch circuit, and has better response effect compared with the prior art.
Description
Technical Field
The embodiment of the invention relates to the technical field of circuit safety, in particular to a voltage surge protection system.
Background
The voltage surge protection circuit is a core protection unit in the electronic system, and is used for detecting the voltage surge state in the electronic system and controlling the electronic system to prevent the electronic system from being damaged due to the voltage surge.
The voltage surge protection circuit of the prior art is shown in fig. 1. Referring to fig. 1, the existing voltage surge protection circuit performs surge detection at the output end of the dc power supply, triggers the optocoupler to work after the output end detects the surge voltage, the voltage of the CE electrode of the optocoupler is pulled down to the input ground GND1, the driving voltage of Q1 is reduced to a low level, and Q1 is turned off to disconnect the path between the input ground and the output ground.
The prior voltage surge protection circuit shown in fig. 1 has the following problems:
(1) Due to the adoption of the back-end surge detection scheme, surge voltage is detected at the output end of the direct-current power supply, and inherent detection delay exists.
(2) Because the front end turn-off surge scheme is adopted, when the input voltage is high, the CE pole of the optocoupler bears the input voltage, so the optocoupler is not suitable for high-voltage input and low-voltage output occasions.
(3) Because the front end turn-off surge scheme is adopted, the input power supply is forcibly turned off in the surge process, and all loads stop working, so that the influence on the system is larger.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a voltage surge protection system which is used for solving part or all of the problems in the background art.
Specifically, the embodiment of the invention provides the following technical scheme:
the embodiment of the invention provides a voltage surge protection system, which comprises: a voltage surge detection control circuit and a surge protection switch circuit;
the first end of the voltage surge detection control circuit is connected with the power input end and is used for performing front-end surge detection; the second end of the voltage surge detection control circuit is connected with the control end of the surge protection switch circuit and is used for controlling the surge protection switch circuit according to a front-end surge detection result;
the surge protection switch circuit is arranged between the power output end and a circuit device needing surge protection and is used for performing back-end surge protection under the control of the voltage surge detection control circuit.
Further, the voltage surge detection control circuit comprises an input voltage detection circuit and a voltage surge control circuit;
the input voltage detection circuit is used for being connected with the power input end and detecting whether voltage surge exists at the power input end or not;
and the voltage surge control circuit is used for controlling the switching of the surge protection switch circuit according to the detection result of the input voltage detection circuit, so that the surge protection switch circuit realizes back-end surge protection on a circuit device connected with the surge protection switch circuit.
Further, the input voltage detection circuit includes: the first resistor and the second resistor are in series connection;
the voltage surge control circuit includes: the third resistor, the fourth resistor, the controllable precise voltage stabilizing source and the photoelectric coupler;
the first end of the first resistor is connected with the power input end, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the ground;
the first end of the third resistor is connected with the power input end, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the cathode of the controllable precise voltage stabilizing source, the anode of the controllable precise voltage stabilizing source is connected with the ground, and the reference electrode of the controllable precise voltage stabilizing source is connected with the second end of the first resistor;
the positive electrode of the light emitting diode of the photoelectric coupler is connected with the second end of the third resistor, the negative electrode of the light emitting diode of the photoelectric coupler is connected with the second end of the fourth resistor, the collector electrode of the phototriode of the photoelectric coupler is connected with the power output end, and the emitter electrode of the phototriode of the photoelectric coupler is connected with the control end of the surge protection switch circuit.
Further, the surge protection switching circuit includes: a fifth resistor, a sixth resistor and a semiconductor field effect transistor;
the grid electrode of the semiconductor field effect transistor is connected with the emitter electrode of the phototriode of the photoelectric coupler, the drain electrode of the semiconductor field effect transistor is connected with the circuit device needing surge protection, and the source electrode of the semiconductor field effect transistor is connected with the power supply output end;
the first end of the fifth resistor is connected with the power supply output end, and the second end of the fifth resistor is connected with the grid electrode of the semiconductor field effect transistor; the first end of the sixth resistor is connected with the second end of the fifth resistor, and the second end of the sixth resistor is connected with ground.
Further, when power is required to be supplied to both the insensitive circuit device and the sensitive circuit device, the insensitive circuit device is directly connected with the power input end, and the sensitive circuit device is used as the circuit device which needs to be subjected to surge protection and is connected with the surge protection switch circuit.
Further, the sensitive circuit device is a chip-type circuit device.
Further, the system further comprises: a DC converter; one end of the direct current converter is connected with the power input end, and the other end of the direct current converter is connected with the load power utilization end. Further, the DC converter is any one of an isolated DC/DC converter, a non-isolated DC/DC converter, and a linear voltage regulator.
Further, the voltage surge control circuit further includes: a zener diode;
the cathode of the voltage stabilizing diode is connected with the anode of the light emitting diode of the photoelectric coupler; the positive pole of the voltage stabilizing diode is connected with the ground.
Further, the photocoupler includes a dual light emitting diode.
As can be seen from the above technical solutions, the voltage surge protection system provided by the embodiment of the present invention includes: the device comprises a voltage surge detection control circuit and a surge protection switch circuit, wherein a first end of the voltage surge detection control circuit is connected with a power input end and used for performing front-end surge detection; the second end of the voltage surge detection control circuit is connected with the control end of the surge protection switch circuit and is used for controlling the surge protection switch circuit according to a front-end surge detection result; the surge protection switch circuit is arranged between the power output end and a circuit device needing surge protection and is used for performing back-end surge protection under the control of the voltage surge detection control circuit. Therefore, the voltage surge protection system provided by the embodiment of the invention adopts the modes of front-end surge detection and rear-end surge protection control, fully utilizes the inherent delay from the power input end to the power output end, counteracts the response time of the voltage surge detection control circuit and the surge protection switch circuit, and has better response effect compared with the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art voltage surge protection circuit;
FIG. 2 is a schematic diagram of a voltage surge protection system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another structure of a voltage surge protection system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Aiming at the problems in the prior art, the embodiment of the invention provides a voltage surge protection system, which adopts a front-end surge detection and rear-end surge protection control mode, fully utilizes the inherent delay from a power input end to a power output end, counteracts the response time of a voltage surge detection control circuit and a surge protection switch circuit, and has better response effect compared with the prior art. The present invention will be explained in detail by means of specific examples.
Fig. 2 is a schematic structural diagram of a voltage surge protection system according to an embodiment of the present invention, referring to fig. 2, a voltage surge protection system according to a first embodiment of the present invention includes: a voltage surge detection control circuit and a surge protection switch circuit;
the first end of the voltage surge detection control circuit is connected with the power input end and is used for performing front-end surge detection; the second end of the voltage surge detection control circuit is connected with the control end of the surge protection switch circuit and is used for controlling the surge protection switch circuit according to a front-end surge detection result;
the surge protection switch circuit is arranged between the power output end and a circuit device needing surge protection and is used for performing back-end surge protection under the control of the voltage surge detection control circuit.
It should be noted that, in the voltage surge protection system provided in this embodiment, the voltage surge detection control circuit detects a voltage surge at the power input end, and when detecting the voltage surge, performs driving control, and controls the surge protection switching circuit to perform switching operation, so that a circuit device that needs to perform surge protection is powered off.
It should be noted that, the voltage surge protection system provided in this embodiment adopts the modes of front-end surge detection and back-end surge protection control, fully uses the inherent delay from the power input end to the power output end, counteracts the response time of the voltage surge detection control circuit and the surge protection switch circuit, and has a better response effect compared with the prior art.
In this embodiment, the circuit device to be subjected to surge protection may refer to all circuit devices in the system, and may also refer to sensitive circuit devices in the system that are relatively sensitive to voltage, such as chip-type circuit devices. Since the supply voltage of the circuit devices of the chip type is gradually reduced, and losses of such devices are easily caused when the voltage is too high, the sensitive circuit devices can be generally understood as the circuit devices of the chip type, and certainly, other devices which are relatively sensitive to the voltage are not excluded.
As can be seen from the above description, the voltage surge protection system provided in this embodiment includes: the device comprises a voltage surge detection control circuit and a surge protection switch circuit, wherein a first end of the voltage surge detection control circuit is connected with a power input end and used for performing front-end surge detection; the second end of the voltage surge detection control circuit is connected with the control end of the surge protection switch circuit and is used for controlling the surge protection switch circuit according to a front-end surge detection result; the surge protection switch circuit is arranged between the power output end and a circuit device needing surge protection and is used for performing back-end surge protection under the control of the voltage surge detection control circuit. Therefore, the voltage surge protection system provided by the embodiment adopts the modes of front-end surge detection and rear-end surge protection control, fully utilizes the inherent delay from the power input end to the power output end, counteracts the response time of the voltage surge detection control circuit and the surge protection switch circuit, and has better response effect compared with the prior art.
Based on the above-described embodiments, in a preferred embodiment, the voltage surge detection control circuit further includes an input voltage detection circuit and a voltage surge control circuit;
the input voltage detection circuit is used for being connected with the power input end and detecting whether voltage surge exists at the power input end or not;
and the voltage surge control circuit is used for controlling the switching of the surge protection switch circuit according to the detection result of the input voltage detection circuit, so that the surge protection switch circuit realizes back-end surge protection on a circuit device connected with the surge protection switch circuit.
In this embodiment, the input voltage detection circuit is configured to detect whether a voltage surge exists at the power input end, and when the input voltage detection circuit detects that the voltage surge exists at the power input end, the voltage surge control circuit connected to the input voltage detection circuit controls the surge protection switch circuit to be turned off, so as to stop supplying power to a circuit device that needs to be subjected to surge protection, thereby protecting the circuit device that needs to be subjected to surge protection.
Based on the above examples, in a preferred embodiment, a specific implementation of the input voltage detection circuit and the voltage surge control circuit is presented.
Referring to fig. 3, the input voltage detection circuit 1 includes: the first resistor R1 and the second resistor R2 are in series connection;
the voltage surge control circuit 2 includes: the third resistor R3, the fourth resistor R4, the controllable precision voltage stabilizing source ZD1 and the photoelectric coupler U1 (the light emitting diode in the photoelectric coupler U1 in FIG. 3 is a double light emitting diode);
the first end of the first resistor R1 is connected with the power input end, the second end of the first resistor R1 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is connected with the ground;
the first end of the third resistor R3 is connected with the power input end, the second end of the third resistor R3 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the cathode of the controllable precise voltage stabilizing source ZD1, the anode of the controllable precise voltage stabilizing source ZD1 is connected with the ground, and the reference electrode of the controllable precise voltage stabilizing source ZD1 is connected with the second end of the first resistor R1;
the positive pole of the light emitting diode of the photoelectric coupler U1 is connected with the second end of the third resistor R3, the negative pole of the light emitting diode of the photoelectric coupler U1 is connected with the second end of the fourth resistor R4, the collector of the phototriode of the photoelectric coupler U1 is connected with the power output end, and the emitter of the phototriode of the photoelectric coupler U1 is connected with the control end of the surge protection switch circuit 3.
It should be noted that, the present embodiment adopts a back-end surge protection switch scheme, and since the optocoupler switches on the back-end circuit, the high input voltage will not affect the optocoupler CE pole, and is suitable for high-voltage input occasions. In other words, the embodiment adopts a rear end turn-off surge scheme, and the CE pole of the optocoupler bears the output voltage, so that the optocoupler is suitable for high-voltage input and low-voltage output occasions.
Based on the above-described example, referring to fig. 3, in a preferred embodiment, the surge protection switching circuit 3 includes: a fifth resistor R5, a sixth resistor R6, and a semiconductor field effect transistor Q1;
the grid electrode of the semiconductor field effect transistor Q1 is connected with the emitter electrode of the phototriode of the photoelectric coupler U1, the drain electrode of the semiconductor field effect transistor Q1 is connected with the circuit device needing surge protection, and the source electrode of the semiconductor field effect transistor Q1 is connected with the power supply output end;
a first end of the fifth resistor R5 is connected with the power supply output end, and a second end of the fifth resistor R5 is connected with the grid electrode of the semiconductor field effect transistor Q1; the first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, and the second end of the sixth resistor R6 is connected to ground.
The surge protection switch circuit 3 may be implemented by an electronic switch such as a transistor or a relay in addition to the semiconductor field effect transistor Q1, which is not limited in the present invention, and may be implemented by a suitable switching device according to practical situations.
Based on the above embodiment, referring to fig. 3, in a preferred embodiment, when power is required to be supplied to both the insensitive circuit device and the sensitive circuit device, the insensitive circuit device is directly connected to the power input terminal, and the sensitive circuit device is used as the circuit device requiring surge protection and is connected to the surge protection switch circuit.
It should be noted that the sensing circuit device herein may be understood as a single sensing device, or may be understood as a circuit with a sensing device; similarly, an insensitive circuit device is understood to mean a single insensitive device, and also a circuit with an insensitive device. In addition, the insensitive circuit device herein refers to a device insensitive to a circuit voltage, that is, a circuit device not easily damaged by a large voltage.
Therefore, in the preferred embodiment, the insensitive circuit device and the sensitive circuit device are distinguished and connected in different circuit connection modes, so that the sensitive circuit device is not damaged by surge voltage, and meanwhile, the insensitive circuit device is not influenced by the surge voltage to work normally, namely, the preferred embodiment provides a novel front-end voltage surge protection strategy which is different from a conventional surge protection strategy for switching off all load power supply, and the sensitive circuit device is switched off in a targeted mode, so that the insensitive circuit device is not influenced, and the influence on a system is reduced to the greatest extent.
The working principle of the voltage surge protection system provided by the embodiment of the invention is described below with reference to fig. 3. As can be seen from fig. 3, when a voltage surge exists at the power input end, the input voltage detection circuit 1 detects the voltage surge, and then the controllable precise voltage stabilizing source ZD1 (which can be implemented by TL431, TLV431, a comparator or the like) in the voltage surge control circuit 2 is turned on, so that the photo coupler U1 is driven to be turned on, so that the voltage difference between the gate and the source of the semiconductor field effect transistor Q1 is reduced, and the source and the drain of the semiconductor field effect transistor Q1 are not turned on, so that the dc converter 4 stops supplying power to the sensitive circuit device 6, the power of the sensitive circuit device 6 is cut off, and the effect of protecting the sensitive circuit device 6 is further achieved. When no voltage surge exists at the power supply input end, the source electrode and the drain electrode of the semiconductor field effect transistor Q1 are in a conducting state, so that the direct current converter 4 can supply power to the sensitive circuit device 6 and the insensitive circuit device 5 at the same time.
From the above analysis, the embodiment adopts the front-end voltage surge detection scheme to detect the surge voltage at the input end of the direct-current power supply, has no inherent detection delay and has faster response speed. In addition, the rear end turn-off surge scheme is adopted in the embodiment, and the CE pole of the optocoupler bears output voltage, so that the system is suitable for high-voltage input and low-voltage output occasions. In addition, the embodiment adopts a back-end turn-off surge scheme, the direct current power supply works normally, and only part of power supply, such as a sensitive circuit (e.g. a low-voltage chip), is turned off during surge, so that the work of other parts of the system is not influenced. In summary, the voltage surge protection strategy of this embodiment is as follows: the control of front-end surge detection and rear-end surge action is realized by utilizing the optocoupler, and the operation is graded, so that the whole voltage surge protection system has no inherent detection delay, has higher response speed, is suitable for the occasions of high-voltage input and low-voltage output, and reduces the influence on the system as much as possible by only switching off part of power supply when the surge occurs.
Based on the above examples, referring to fig. 3, in a preferred embodiment, the system further comprises: a DC converter; one end of the direct current converter is connected with the power input end, and the other end of the direct current converter is connected with the load power utilization end.
In order to adapt to the load requirement, it is preferable that the dc converter is connected to the power input terminal to convert the input dc voltage into a dc voltage that meets the load requirement.
It should be noted that, referring to fig. 3, when the load power end of the circuit includes both the insensitive circuit device 5 and the sensitive circuit device 6, the other end of the dc converter is directly connected to the insensitive device 5 for the insensitive device 5; for the sensitive device 6, the other end of the dc converter is connected to the source of the semiconductor field effect transistor Q1, and when a voltage surge exists at the input end of the power supply, the source and the drain of the semiconductor field effect transistor Q1 are in a non-conductive state, and the dc converter 4 cannot supply power to the sensitive circuit device 6, so that the power of the sensitive circuit device 6 is cut off, and the effect of protecting the sensitive circuit device 6 is achieved. When no voltage surge exists at the power supply input end, the source electrode and the drain electrode of the semiconductor field effect transistor Q1 are in a conducting state, so that the direct current converter 4 can supply power to the sensitive circuit device 6 and the insensitive circuit device 5 at the same time.
The DC converter may be any one of an isolated DC/DC converter, a non-isolated DC/DC converter, and a linear voltage regulator.
Based on the above example, referring to fig. 3, in a preferred embodiment, the voltage surge control circuit 2 further includes: a zener diode ZD1;
the cathode of the voltage stabilizing diode ZD1 is connected with the anode of the light emitting diode of the photoelectric coupler U1; the positive electrode of the zener diode ZD1 is connected to ground.
In order to protect the photocoupler U1 from high voltage, the voltage surge control circuit 2 is preferably further provided with a zener diode ZD1.
In the description of the present invention, it should be noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A voltage surge protection system, comprising: a voltage surge detection control circuit and a surge protection switch circuit;
the voltage surge detection control circuit comprises an input voltage detection circuit and a voltage surge control circuit; the input voltage detection circuit is connected with the power input end and is used for detecting whether voltage surge exists at the power input end or not; the voltage surge control circuit is connected with the control end of the surge protection switch circuit and is used for controlling the switching of the surge protection switch circuit according to the detection result of the input voltage detection circuit, so that the surge protection switch circuit realizes back-end surge protection on circuit devices connected with the surge protection switch circuit;
the surge protection switch circuit is arranged between the power supply output end and a circuit device needing surge protection and is used for performing back-end surge protection under the control of the voltage surge detection control circuit;
the input voltage detection circuit includes: the first resistor and the second resistor are in series connection;
the voltage surge control circuit includes: the third resistor, the fourth resistor, the controllable precise voltage stabilizing source and the photoelectric coupler;
the first end of the first resistor is connected with the power input end, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the ground;
the first end of the third resistor is connected with the power input end, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the cathode of the controllable precise voltage stabilizing source, the anode of the controllable precise voltage stabilizing source is connected with the ground, and the reference electrode of the controllable precise voltage stabilizing source is connected with the second end of the first resistor;
the positive electrode of the light emitting diode of the photoelectric coupler is connected with the second end of the third resistor, the negative electrode of the light emitting diode of the photoelectric coupler is connected with the second end of the fourth resistor, the collector electrode of the phototriode of the photoelectric coupler is connected with the power supply output end, and the emitter electrode of the phototriode of the photoelectric coupler is connected with the control end of the surge protection switch circuit;
the surge protection switching circuit includes: a fifth resistor, a sixth resistor and a semiconductor field effect transistor;
the grid electrode of the semiconductor field effect transistor is connected with the emitter electrode of the phototriode of the photoelectric coupler, the drain electrode of the semiconductor field effect transistor is connected with the circuit device needing surge protection, and the source electrode of the semiconductor field effect transistor is connected with the power supply output end;
the first end of the fifth resistor is connected with the power supply output end, and the second end of the fifth resistor is connected with the grid electrode of the semiconductor field effect transistor; the first end of the sixth resistor is connected with the second end of the fifth resistor, and the second end of the sixth resistor is connected with ground;
when the power supply is needed to be simultaneously supplied to the insensitive circuit device and the sensitive circuit device, the insensitive circuit device is directly connected with the power input end, and the sensitive circuit device is used as the circuit device needing surge protection and is connected with the drain electrode of the semiconductor field effect transistor.
2. The system of claim 1, wherein the sensitive circuit device is a chip-type circuit device.
3. The system of claim 1, wherein the system further comprises: a DC converter; one end of the direct current converter is connected with the power input end, and the other end of the direct current converter is connected with the load power utilization end.
4. The system of claim 3, wherein the DC converter is any one of an isolated DC/DC converter, a non-isolated DC/DC converter, or a linear voltage regulator.
5. The system of claim 1, wherein the voltage surge control circuit further comprises: a zener diode;
the cathode of the voltage stabilizing diode is connected with the anode of the light emitting diode of the photoelectric coupler; the positive pole of the voltage stabilizing diode is connected with the ground.
6. The system of claim 1, wherein the optocoupler comprises a dual light emitting diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811562398.2A CN111355214B (en) | 2018-12-20 | 2018-12-20 | Voltage surge protection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811562398.2A CN111355214B (en) | 2018-12-20 | 2018-12-20 | Voltage surge protection system |
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| CN111355214A CN111355214A (en) | 2020-06-30 |
| CN111355214B true CN111355214B (en) | 2023-05-09 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203415971U (en) * | 2013-07-08 | 2014-01-29 | 中国航空无线电电子研究所 | Anti-overvoltage surge protection control circuit designed based on field-effect transistor |
| CN206332447U (en) * | 2016-12-29 | 2017-07-14 | 石家庄泽润科技有限公司 | Direct current inputs anti-surge voltage circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205212416U (en) * | 2015-12-28 | 2016-05-04 | 航天长峰朝阳电源有限公司 | Simple reliable surge inhibiting module |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203415971U (en) * | 2013-07-08 | 2014-01-29 | 中国航空无线电电子研究所 | Anti-overvoltage surge protection control circuit designed based on field-effect transistor |
| CN206332447U (en) * | 2016-12-29 | 2017-07-14 | 石家庄泽润科技有限公司 | Direct current inputs anti-surge voltage circuit |
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