CN209267156U - A kind of overvoltage crowbar and electronic equipment based on chip - Google Patents
A kind of overvoltage crowbar and electronic equipment based on chip Download PDFInfo
- Publication number
- CN209267156U CN209267156U CN201920206615.8U CN201920206615U CN209267156U CN 209267156 U CN209267156 U CN 209267156U CN 201920206615 U CN201920206615 U CN 201920206615U CN 209267156 U CN209267156 U CN 209267156U
- Authority
- CN
- China
- Prior art keywords
- transistor
- chip
- pole
- overvoltage
- resistance
- 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.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of overvoltage crowbar and electronic equipment based on chip, by the way that one end of overvoltage protective module is connected power module, the other end connects any pin of IC chip；So that overvoltage protective module generates overvoltage protection signal, and overvoltage protection signal is exported to IC chip when the output voltage values of power module are greater than preset voltage threshold, enter lock state to trigger IC chip.I.e. when the output voltage values of power module are greater than preset voltage threshold, overvoltage protective module destroys the original close loop control circuit of IC chip, so that IC chip is defaulted as, circuit breaks down, and stops output, into lock state.Above-mentioned technical proposal solves in the prior art, in order to realize that OVP lock machine function must use and have the IC chip of OVP lock machine mode, the problem of limit device type selecting, so that arbitrary IC chip can realize OVP self-locking function, parts selection range is wide, saves cost.
Description
Technical field
The utility model embodiment is related to technical field of integrated circuits more particularly to a kind of overvoltage protection electricity based on chip
Road and electronic equipment.
Background technique
Electronic equipment, which will work normally, be unable to do without stable power supply.However, in actual use, by it is various it is non-just
The voltage of the influence of Chang Yinsu, supply power supply output can generate exception, once these situations occur, can will lead to and be applied to electricity
Voltage in sub- equipment is excessive.In this way, often result in serious consequence, gently then electronic equipment is burned out or supplies power supply and damaged
It is bad, it is heavy then cause the safety accidents such as fire, explosion.Therefore, increase suitable overvoltage protection (Over in the circuit of electronic equipment
Voltage Protection, OVP) circuit is extremely important.
In the prior art, electronic equipment generallys use the integrated circuit (Integrated with OVP lock machine mode
Circuit, IC) chip, realize OVP lock machine function.Specifically, the IC chip with OVP lock machine mode is in electronic equipment power source
Output voltage when reaching preset voltage threshold, OVP lock machine mode can be entered based on the protection system of itself, reach over-voltage guarantor
Eye protection.If IC chip itself protects system not have OVP lock machine mode, guarantor of the electronic equipment based on IC chip itself
Protecting system cannot achieve overvoltage protection.This significantly limits the type selecting of electronic devices in research and development, increases device cost.
Utility model content
In view of this, the present invention provides a kind of overvoltage crowbar and electronic equipment based on chip, it is existing to solve
Have in technology, in order to realize that OVP lock machine function must use the IC chip for having OVP lock machine mode, limit device type selecting is asked
Topic
In a first aspect, the utility model embodiment provides a kind of overvoltage crowbar based on chip, comprising: power supply mould
Block, IC chip and overvoltage protective module；
One end of the overvoltage protective module connects the power module, and the other end connects any of the IC chip and draws
Foot；
Wherein, the overvoltage protective module, for when the output voltage values of power module be greater than preset voltage threshold when,
Overvoltage protection signal is generated, and the overvoltage protection signal is exported to the IC chip, enters lock to trigger the IC chip
Determine state.
Optionally, further includes: over-voltage detection module；The input terminal of the over-voltage detection module connects the power module,
And the output end of the over-voltage detection module connects the overvoltage protective module；The over-voltage detection module, it is described for detecting
The output voltage values of power module, and the output voltage values are being detected greater than the preset voltage threshold, to the mistake
Protective module output overvoltage signal is pressed, generates the overvoltage protection signal to trigger the overvoltage protective module.
Optionally, the over-voltage detection module includes: photoelectrical coupler, and the overvoltage protective module includes: first crystal
Pipe, second transistor and third transistor；
First pole of the first transistor connects the photoelectrical coupler, and the second pole of the first transistor connects institute
The first pole of second transistor is stated, and, the third pole of the first transistor is connect with the power pins of the IC chip；
Second pole of the second transistor is grounded, and the third pole of the second transistor is any non-with the IC chip
Power pins connection；
Second pole of the third transistor is connect with the first pole of the first transistor, and the of the third transistor
Three poles ground connection.
Optionally, the overvoltage protective module further include: first resistor；The first end of the first resistor and described second
The third pole of transistor connects, and second end is connect with any non-electrical source pin of the IC chip.
Optionally, when the output voltage values are greater than the preset voltage threshold, the photoelectrical coupler conducting, with
Trigger the first transistor conducting；After the first transistor conducting, supply voltage that the power pins of the IC chip receive
Letter signal is transmitted to the first pole of the second transistor by the first transistor, to turn off the second transistor；Institute
After stating second transistor shutdown, the second end of first resistor is hanging, triggers the IC chip and enters lock state.
Optionally, the first transistor is PNP type triode, and the second transistor is PNP type triode, described the
Three transistors are NPN type triode.
Optionally, the overvoltage protective module further include: second resistance and 3rd resistor；The first end of the second resistance
It is connect with the power pins of the IC chip, the second end of the second resistance is connect with the first pole of the first transistor；
The first end of the 3rd resistor is connect with the power pins of the IC chip, the second end of the 3rd resistor and described first
The third pole of transistor connects.
Optionally, overvoltage protective module further include: resistance capacitance submodule, the resistance capacitance submodule include the 4th electricity
Resistance and first capacitor；First pole of the first termination second transistor of the 4th resistance, the second termination of the 4th resistance
Ground；First pole of the first termination second transistor of the first capacitor, the second end ground connection of the first capacitor.
Optionally, overvoltage crowbar further include: the second capacitor；The non-electrical source pin connecting with the second transistor is
The mode MODE pin of the IC chip, the MODE pin pass through second capacity earth.
Second aspect, the utility model embodiment additionally provide a kind of electronic equipment, which is characterized in that the electronic equipment
Comprising as described in above-mentioned first aspect based on the overvoltage crowbar of chip.
The overvoltage crowbar and electronic equipment based on chip provided in foregoing invention embodiment, by by overvoltage protection
One end of module connects power module, and the other end connects any pin of IC chip；So that working as the output voltage values of power module
When greater than preset voltage threshold, overvoltage protective module generates overvoltage protection signal, and overvoltage protection signal is exported to IC core
Piece enters lock state to trigger IC chip.I.e. when the output voltage values of power module are greater than preset voltage threshold, over-voltage
Protective module movement destroys the original close loop control circuit of IC chip, so that IC chip enters lock state, realizes that over-voltage is protected
Shield, to solve the problems, such as that existing electronic equipment realizes that OVP lock machine function limitation protects system in IC chip itself, so that electric
Sub- equipment can realize OVP self-locking function based on arbitrary IC chip, and parts selection range is wide, saves cost.
Detailed description of the invention
Fig. 1 is the functional block diagram of overvoltage crowbar of one of the utility model embodiment based on chip；
Fig. 2 is the functional block diagram of overvoltage crowbar of one of the utility model alternative embodiment based on chip；
Fig. 3 is the structural schematic diagram of the overvoltage crowbar based on chip in the utility model embodiment.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Fig. 1 is the functional block diagram of the overvoltage crowbar based on chip in the utility model embodiment；The present embodiment can
The case where suitable for overvoltage protection, is somebody's turn to do the overvoltage crowbar based on IC chip and is arranged in the control circuit of equipment, with IC core
Piece connection.
As shown in Figure 1, the overvoltage crowbar based on chip specifically includes that power module 110, IC chip
120 and overvoltage protective module 130；One end of overvoltage protective module 130 connects power module 110, and the other end connects IC chip 120
Any pin.
Wherein, overvoltage protective module 130 are greater than preset voltage threshold for the output voltage values when power module 110
When, overvoltage protection signal is generated, and overvoltage protection signal is exported to IC chip 120, enters locking shape to trigger IC chip 120
State.Power module 110 is attached with load, can provide stable voltage for load.IC chip 120 and power module 110
Connection is mainly used for controlling power module 110 to work normally.
It should be noted that in the present embodiment, overvoltage protective module 130 can be with any pin in IC chip 120
It is attached, the specific pin of IC chip 120 is not defined.Illustratively, any pin in IC chip passes through electricity
Resistance ground connection, when the output voltage values of power module 110 are greater than preset voltage threshold, overvoltage protective module 130 generates over-voltage
Signal is protected, the connection between the resistance and ground of any pin in IC chip is cut off, so that any pin in IC chip
Resistance is hanging, to destroy original circuit structure, so that circuit carries out fault mode, IC chip realizes self-locking function.
The overvoltage crowbar based on chip provided in the present embodiment, by the way that one end of overvoltage protective module is connected electricity
Source module, the other end connect any pin of IC chip, so that the output voltage values when power module are greater than preset voltage threshold
When value, overvoltage protective module generates overvoltage protection signal, and overvoltage protection signal is exported to IC chip, with trigger IC chip into
Enter lock state.I.e. when the output voltage values of power module are greater than preset voltage threshold, overvoltage protective module movement is destroyed
The original close loop control circuit of IC chip so that IC chip is defaulted as circuit failure, and stops exporting, into locking shape
State realizes overvoltage protection, has OVP lock machine mode to solve realization OVP lock machine function in the prior art and must use
Parts selection limitation problem caused by IC chip, so that arbitrary IC chip can realize OVP self-locking function, parts selection
Range is wide, saves cost.
Further, Fig. 2 is the original of overvoltage crowbar of one of the utility model alternative embodiment based on chip
Block diagram is managed, as shown in Fig. 2, the overvoltage crowbar based on chip can also include: over-voltage detection module 140；Over-voltage detects mould
The input terminal of block 140 connects power module 120, and the output end of over-voltage detection module 140 connects overvoltage protective module 130；It crosses
Detection module 140 is pressed, for detecting the output voltage values of power module 110, and is detecting that it is preset that output voltage values are greater than
Voltage threshold generates overvoltage protection signal to 130 output overvoltage signal of overvoltage protective module to trigger overvoltage protective module 130.
In the present embodiment, the input terminal of over-voltage detection module 130 is connect with the output end of power module 110, and real
When detect output voltage values, when output voltage values be greater than preset voltage threshold when, generate an over-voltage signal, and can be by the mistake
Pressure signal is exported to overvoltage protective module 130, is acted so as to trigger overvoltage protective module 130.Specifically, when over-voltage is believed
After number being input to overvoltage protective module 130, overvoltage protective module 130 is acted, so as to destroy IC chip 120, power module
110 and overvoltage protective module 130 form close loop control circuit so that circuit break down.When IC chip 120 detects circuit
When failure, automatically into self-locking mode, power module 110 is no longer output control signals to.Power module 110 does not receive
Signal is controlled, so that power module 110 stops working, no longer output voltage values realize overvoltage protection.
Fig. 3 is the structural schematic diagram of the overvoltage crowbar provided by the embodiment of the utility model based on chip, this implementation
Example is that the specific structure for further illustrating the overvoltage crowbar based on chip on the basis of the above embodiments and connection are closed
System.
Specifically, overvoltage protective module 130 wraps as shown in figure 3, over-voltage detection module 140 includes: photoelectrical coupler PC
It includes: the first transistor Q1, second transistor Q2 and third transistor Q3；The first pole of the first transistor Q1 connects photoelectric coupling
Device PC, the first transistor Q1 the second pole connection second transistor Q2 the first pole, and, the third pole of the first transistor Q1 with
The power pins VCC connection of IC chip.The second pole of second transistor Q2 is grounded, the third pole of second transistor Q2 and IC chip
120 any non-electrical source pin connection；The second pole of third transistor Q3 is connect with the first pole of the first transistor Q1, and third is brilliant
The third pole of body pipe Q3 is grounded.
Further, overvoltage protective module 130 further include: first resistor R1；The first end of first resistor R1 is brilliant with second
The third pole of body pipe Q2 connects, and second end is connect with any non-electrical source pin of IC chip 120.
The working principle of overvoltage crowbar provided in this embodiment based on chip is as follows: when output voltage values are greater than in advance
If voltage threshold when, photoelectrical coupler PC conducting, with trigger the first transistor Q1 conducting；After the first transistor Q1 conducting, IC
The power supply voltage signal that the power pins of chip 120 receive is transmitted to the first of second transistor Q2 by the first transistor Q1
Pole, to turn off second transistor Q2；Second transistor Q2 shutdown after, the second end of first resistor R1 is hanging, triggering IC chip into
Enter lock state.
Further, photoelectrical coupler PC includes LED P C1 and photistor PC2, the first pole of transistor
For the base stage of transistor, the collector of the extremely transistor of the second of transistor, the emitter of the third of transistor extremely transistor.
In the present embodiment, when output voltage values are less than preset voltage threshold, photoelectrical coupler PC shutdown, first is brilliant
The base stage of body pipe Q1 is hanging, so that the first transistor Q1 is turned off, the base earth of second transistor Q2, receives low level letter at this time
Number, so that second transistor Q2 is connected, first resistor R1 is grounded by second transistor Q2, and entire circuit is in normal work
State, IC chip 120 work normally, and generate output signal driving power module 110 and work normally.
When output voltage values are greater than preset voltage threshold, the electric signal of output drives LED P C1, makes to shine
Diode PC1 issues the light of certain wavelength, is received by photistor PC2 and generates photoelectric current, after being further amplified
It exports to the base stage of the first transistor Q1.For the base stage of the first transistor Q1 by the photistor PC2 ground connection of conducting, first is brilliant
The base stage of body pipe Q1 receives low level signal, and triggering the first transistor Q1 is connected, after the first transistor Q1 conducting, IC chip 120
The power supply voltage signal that receives of power pins the base stage of second transistor Q2 is transmitted to by the first transistor Q1, at this point,
The base stage of second transistor Q2 receives high level signal, second transistor Q2 shutdown, so that the second end of first resistor R1 is hanging,
I.e. so that the second end of first resistor R1 is no longer grounded, the original close loop control circuit of IC chip is destroyed, so that IC chip is defaulted
For circuit breaks down, and stops output signal, into lock state.Power module 110 stops working simultaneously, and then realizes
Voltage protection.
It should be noted that photoelectrical coupler PC may be at closing when output voltage values are equal to preset voltage threshold
Disconnected state, so that the base stage of the first transistor Q1 is hanging, so that the first transistor Q1 is in an off state；Alternatively, photoelectric coupling
LED P C1 conducting in device PC, and issues the light of certain wavelength, with drive photoelectrical coupler PC by photistor
PC2, to drag down the level of base stage, etc. of the first transistor Q1, the utility model is not specifically limited this.
Further, after the first transistor Q1 conducting, the power supply voltage signal that the power pins of IC chip 120 receive is logical
The base stage that the first transistor Q1 is transmitted to third transistor Q3 is crossed, the base stage of third transistor Q3 receives high level signal, third
Transistor Q3 conducting, so that the base stage of the first transistor Q1 is grounded by third transistor Q3, persistently drags down the first transistor Q1
Base stage be low level state, improve the reliability of circuit.
Preferably, the first transistor is PNP type triode, and second transistor is PNP type triode, and third transistor is
NPN type triode.It should be noted that only the type of transistor is illustrated in the present embodiment and non-limiting, it can be with circuit
Specific use occasion and effect use other kinds of transistor, illustratively, transistor can be bipolar transistor and
Field effect transistor.
Further, as shown in figure 3, overvoltage protective module 130 can also include: second resistance R2 and 3rd resistor R3；
The first end of second resistance R2 is connect with the power pins VCC of IC chip 120, the second end and the first transistor of second resistance R2
The first pole of Q1 connects；The first end of 3rd resistor R3 is connect with the power pins VCC of IC chip 120, and the of 3rd resistor R3
Two ends connect the other end with the third pole of the first transistor and connect with the third pole of the first transistor Q3.
Further, second resistance R2 and 3rd resistor R3 can be current-limiting resistance, be input to first crystal for limiting
The current signal of pipe Q1 avoids the current signal for being input to the first transistor Q1 excessive and burns the first transistor Q1.
Further, overvoltage protective module 130 can also include: resistance capacitance submodule.Resistance capacitance submodule tool
Body may include the 4th resistance R4 and first capacitor C1；The first end of 4th resistance R4 and the first pole of second transistor Q2 connect
It connects, the second end ground connection of the 4th resistance R4；The first end of first capacitor C1 and the first pole of second transistor Q2, first capacitor C1
The other end ground connection.
In the present embodiment, it should be noted that the 4th resistance R4 is pull down resistor, for neutral signal is clamped low
Level state, to ensure the reliable and stable work of second transistor Q2；First capacitor C1 is shunt capacitance, for filtering out input letter
Alternating component in number, to improve the anti-interference ability of system.I.e. when there is high-frequency ac noise jamming in input signal, first
Capacitor C1 can be by its ac short circuit over the ground, to eliminate interference.It should be noted that input signal is to be input to second transistor
The signal of the base stage of Q2.
Further, overvoltage protective module 130 further include: the 5th resistance R5.Wherein, the first termination the of the 5th resistance R5
The first pole of three transistor Q3, the second pole of the second termination second transistor Q2 of the 5th resistance R5.5th resistance R5 is also limit
Leakage resistance avoids the current signal for being input to third transistor Q3 for limiting the current signal for being input to third transistor Q3
It is excessive and burn third transistor Q3.
Further, over-voltage detection module 140 further include: controllable accurate source of stable pressure U1, the 6th resistance R6, the 7th resistance
R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, third capacitor C3 and the 4th capacitor C4.Wherein, controllable accurate pressure stabilizing
The cathode of the plus earth of source U1, controllable accurate source of stable pressure U1 is connect with the cathode of LED P C1, controllable accurate source of stable pressure
The control electrode of U1 passes through the 4th capacitor C4, the 6th resistance R6 and the 7th resistance R7 ground connection respectively.The anode of LED P C1 is logical
It crosses the 8th resistance R8 to connect with the output end of power module 110, when normal work, the output end of power module 110 exports 12.7V
Voltage.9th resistance R9 and LED P C1 is connected in parallel.The cathode of LED P C1 by the tenth resistance R10 with
Connect with the output end of power module 110 after the series circuit of third capacitor C3, and the first end of the tenth resistance R10 with controllably
The control electrode of precision voltage regulator U1 connects.
In the present embodiment, the working principle of over-voltage detection module 140 is as follows: when output voltage values are greater than preset voltage
When threshold value, the tenth resistance R10, the 6th resistance R6 and the voltage at the 7th both ends resistance R7 are increased, the first end with the 6th resistance R6
The control pole tension of the controllable accurate source of stable pressure U1 connected with the first end of the 7th resistance R7 increases, more than certain voltage
After value, the anode and cathode of controllable accurate source of stable pressure U1 is connected, and has electric current to flow through in the 8th resistance R8 and the 9th resistance R9, the
The both ends of nine resistance R9 generate voltage, are connected at this time with the LED P C1 of the 9th resistance R9 parallel connection, by electrical-optical-electrical
It converts, is connected between the collector and emitter of phototriode PC2.
It should be noted that only the circuit of over-voltage detection module is illustrated in the present embodiment, and it is non-limiting, in reality
In the application of border, the over-voltage detection module of other circuit structures can choose.
Further, power module 110, which refers to, provides the module of power supply for equipment, and a kind of electricity is provided only in the present embodiment
The connection type of source module, specific connection structure are as shown in Figure 3.It should be noted that not to power module in the present embodiment
It is defined, the overvoltage crowbar provided in this embodiment based on chip is applicable to any kind of power module.
Further, peripheral circuit 150 be in the present embodiment IC chip 120 in order to realize the outer of its original function setting
Enclose circuit.Peripheral circuit 150 can be configured according to the concrete type and job requirement of IC chip 120, in the present embodiment not
Peripheral circuit 150 is defined.
Further, circuit further include: the second capacitor C2；The non-electrical source pin connecting with second transistor Q2 is IC core
The mode MODE pin of piece 120, MODE pin are grounded by the second capacitor C2.
The utility model embodiment additionally provides a kind of electronic equipment, and the electronic equipment includes being based on core as described above
The overvoltage crowbar of piece.
The overvoltage crowbar based on chip provided by the utility model any embodiment can be performed in above-mentioned electronic equipment,
Have the corresponding functional module of execution circuit and beneficial effect.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of overvoltage crowbar based on chip characterized by comprising power module, IC chip and mistake
Press protective module；
One end of the overvoltage protective module connects the power module, and the other end connects any pin of the IC chip；
Wherein, the overvoltage protective module, for generating when the output voltage values of power module are greater than preset voltage threshold
Overvoltage protection signal, and the overvoltage protection signal is exported to the IC chip, enter locking shape to trigger the IC chip
State.
2. circuit according to claim 1, which is characterized in that further include: over-voltage detection module；
The input terminal of the over-voltage detection module connects the power module, and the output end of the over-voltage detection module connects institute
State overvoltage protective module；
The over-voltage detection module for detecting the output voltage values of the power module, and is detecting the output voltage
Value is greater than the preset voltage threshold, Xiang Suoshu overvoltage protective module output overvoltage signal, to trigger the overvoltage protection mould
Block generates the overvoltage protection signal.
3. circuit according to claim 2, which is characterized in that the over-voltage detection module includes: photoelectrical coupler, described
Overvoltage protective module includes: the first transistor, second transistor and third transistor；
First pole of the first transistor connects the photoelectrical coupler, the second pole connection of the first transistor described the
First pole of two-transistor, and, the third pole of the first transistor is connect with the power pins of the IC chip；
Second pole of the second transistor is grounded, the third pole of the second transistor and any non-power of the IC chip
Pin connection；
Second pole of the third transistor is connect with the first pole of the first transistor, the third pole of the third transistor
Ground connection.
4. circuit according to claim 3, which is characterized in that the overvoltage protective module further include: first resistor；
The first end of the first resistor is connect with the third pole of the second transistor, any of second end and the IC chip
The connection of non-electrical source pin.
5. circuit according to claim 4, which is characterized in that
When the output voltage values are greater than the preset voltage threshold, photoelectrical coupler conducting, to trigger described the
One transistor turns；
After the first transistor conducting, the supply voltage letter signal that the power pins of the IC chip receive is brilliant by described first
Body pipe is transmitted to the first pole of the second transistor, to turn off the second transistor；
After the second transistor shutdown, the second end of first resistor is hanging, triggers the IC chip and enters lock state.
6. circuit according to claim 3, which is characterized in that the first transistor be PNP type triode, described second
Transistor is PNP type triode, and the third transistor is NPN type triode.
7. circuit according to claim 3, which is characterized in that the overvoltage protective module further include: second resistance and
Three resistance；
The first end of the second resistance is connect with the power pins of the IC chip, the second end of the second resistance with it is described
First pole of the first transistor connects；
The first end of the 3rd resistor is connect with the power pins of the IC chip, the second end of the 3rd resistor with it is described
The third pole of the first transistor connects.
8. circuit according to claim 3, which is characterized in that the overvoltage protective module further include: resistance capacitance submodule
Block, the resistance capacitance submodule include the 4th resistance and first capacitor；
First pole of the first termination second transistor of the 4th resistance, the second end ground connection of the 4th resistance；
First pole of the first termination second transistor of the first capacitor, the second end ground connection of the first capacitor.
9. according to any circuit of claim 3 to 8, which is characterized in that further include: the second capacitor；
The non-electrical source pin connecting with the second transistor is the mode MODE pin of the IC chip, and the MODE pin is logical
Cross second capacity earth.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes as described in any one of claim 1 to 9 based on core
The overvoltage crowbar of piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920206615.8U CN209267156U (en) | 2019-02-18 | 2019-02-18 | A kind of overvoltage crowbar and electronic equipment based on chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920206615.8U CN209267156U (en) | 2019-02-18 | 2019-02-18 | A kind of overvoltage crowbar and electronic equipment based on chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209267156U true CN209267156U (en) | 2019-08-16 |
Family
ID=67585105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920206615.8U Active CN209267156U (en) | 2019-02-18 | 2019-02-18 | A kind of overvoltage crowbar and electronic equipment based on chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209267156U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113225626A (en) * | 2021-06-15 | 2021-08-06 | Oppo广东移动通信有限公司 | Electronic device and customer premises equipment |
-
2019
- 2019-02-18 CN CN201920206615.8U patent/CN209267156U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113225626A (en) * | 2021-06-15 | 2021-08-06 | Oppo广东移动通信有限公司 | Electronic device and customer premises equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105788556B (en) | A kind of overvoltage crowbar and method, liquid crystal display drive circuit | |
| CN207530518U (en) | Over-pressed short-circuit protection circuit | |
| CN103208776A (en) | Breaker circuit with fault self-detection function | |
| CN203180783U (en) | Boosted circuit | |
| CN106910474B (en) | A kind of short-circuit protection circuit and backlight drive circuit | |
| CN109950881B (en) | Embedded equipment pre-detection protection circuit | |
| CN106711938A (en) | Leakage protector | |
| CN209267156U (en) | A kind of overvoltage crowbar and electronic equipment based on chip | |
| CN106058802B (en) | Anti-failure circuit chip and anti-failure anti-leakage protector | |
| CN203491680U (en) | Automatic reset electric leakage overvoltage/undervoltage protection circuit | |
| CN205583646U (en) | Earth leakage protection wall switch | |
| CN207897177U (en) | A kind of LED drive circuit | |
| CN2720615Y (en) | Intelligent electricity leakage breaker | |
| CN110007118A (en) | For the aging of product and the electric supply system of reliability test | |
| CN203261004U (en) | All-around anti-failure safe leakage protector | |
| CN205986096U (en) | Voltage protection circuit | |
| CN209029914U (en) | A kind of switch power supply under-voltage protecting circuit and Switching Power Supply | |
| CN114597855A (en) | Ground fault leakage protection circuit using silicon controlled rectifier | |
| CN209461383U (en) | Relay drive circuit, relay | |
| EP4140260A1 (en) | A non-isolated driver for led lighting | |
| CN202977969U (en) | Efficient protection circuit of laser coupling power source | |
| CN208046209U (en) | A kind of output overvoltage protection circuit | |
| CN106711949B (en) | The tandem type source of stable pressure that multiple spot protection coexists with monitoring | |
| CN215932033U (en) | Fire-fighting signal detection circuit and fire-fighting signal detection system | |
| CN213957582U (en) | Leakage resistance detection circuit with protection function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |