CN208272621U - A kind of power protecting circuit - Google Patents
A kind of power protecting circuit Download PDFInfo
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- CN208272621U CN208272621U CN201820729446.1U CN201820729446U CN208272621U CN 208272621 U CN208272621 U CN 208272621U CN 201820729446 U CN201820729446 U CN 201820729446U CN 208272621 U CN208272621 U CN 208272621U
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Abstract
The utility model embodiment provides a kind of power protecting circuit, including the first protection circuit and power output circuit, and the first protection circuit is electrically connected with power output circuit；Power output circuit is for powering；First protection circuit is used to provide short-circuit protection for power output circuit.By technical solution provided by the embodiment of the utility model, when short circuit occurs, the first protection circuit will start short-circuit protection to power output circuit, and avoid power output circuit causes component to burn problem even on fire because of short circuit.
Description
Technical field
The utility model relates to electronic circuit technology fields, more particularly to a kind of power protecting circuit.
Background technique
There are many types of hard disk video recorder, for example, DVR (Digital Video Recorder, digital video recorder
Machine), NVR (Network Video Recorder, network hard disk video recorder) etc., no matter which type of hard disk video recorder,
In the case where needing to power to camera or alarm, power output interface can be externally provided, power output interface output
Voltage generally comprises the different voltage class such as 12V, 9V, 5V.
Hard disk video recorder provides different physical interfaces, supplies in equipment such as connection peripheral hardwares such as video camera, alarm and to it
When electric, technical staff is needed to make corresponding cable according to different physical interface, by hard disk video recorder and peripheral apparatus into
Row connection.
Since power supply line and ground line can be reversely connected by misoperation, such cable is in connection peripheral apparatus and accesses power supply
The short circuit that will lead to power output interface when output interface causes the component of power output interface to burn, or even causes
Short-circuit fire causes security risk.
Utility model content
The utility model embodiment is designed to provide a kind of power protecting circuit, is provided when short circuit occurs with realizing
Short-circuit protection.Specific technical solution is as follows:
In a first aspect, the utility model embodiment provides a kind of power protecting circuit, the power protecting circuit includes:
First protection circuit and power output circuit, wherein the first protection circuit is electrically connected with the power output circuit；
The power output circuit, for powering；
The first protection circuit, for providing short-circuit protection for the power output circuit.
Optionally, the short-circuit protection includes: overvoltage protection and/or overcurrent protection.
Optionally, the power output circuit includes first diode, the second diode；Wherein, the first diode
Ground connection, second diode are electrically connected with the first protection circuit；
The first diode is for releasing surge current.
Optionally, the first protection circuit includes electronic switching tube, the first divider resistance, and the electronic switching tube includes
Voltage input pin, voltage output pin, overvoltage protection pin；
The voltage input pin, is electrically connected with voltage input end, and the voltage input end is drawn by the voltage input
Input voltage is input to the electronic switching tube by foot；
The voltage output pin, is electrically connected with the power output circuit, and the electronic switching tube passes through the voltage
Output pin exports output voltage to the power output circuit；
The overvoltage protection pin, is electrically connected with the first divider resistance, and first divider resistance and the voltage are defeated
Enter pin electrical connection；
When the first branch pressure voltage on the overvoltage protection pin is greater than preset first voltage threshold value, the electronics
Switching tube starts overvoltage protection, first branch pressure voltage are as follows: the input voltage is divided by first divider resistance
The voltage obtained afterwards.
Optionally, the electronic switching tube includes overcurrent protection pin；
The overcurrent protection pin, passes through ground resistance earth；
When earth current is greater than preset first current threshold, the electronic switching tube starts overcurrent protection, described
Earth current is the electric current by the ground resistance.
Optionally, the electronic switching tube further includes voltage instruction pin and the second divider resistance；
The voltage indicates pin, is electrically connected with the second divider resistance, second divider resistance and the voltage output
Pin electrical connection；
When the second branch pressure voltage on voltage instruction pin is preset second voltage threshold value, pass through default instruction
Mode indicates that the output voltage is normal, second branch pressure voltage are as follows: the output voltage passes through second divider resistance
The voltage obtained after partial pressure.
Optionally, the power protecting circuit further include: the second protection circuit；
The second protection circuit is electrically connected with the voltage input pin of the first protection circuit, is used for as institute
It states power output circuit and overcurrent protection is provided.
Optionally, the second protection circuit includes thermistor, the thermistor and voltage input pin electricity
Connection.
Optionally, the power protecting circuit further include: control start-up circuit；The electronic switching tube further includes that starting is drawn
Foot；
The control start-up circuit is electrically connected with the starting pin, is opened or is closed for controlling the electronic switching tube
It closes.
Optionally, the control start-up circuit includes metal-oxide half field effect transistor MOSFET, triode；
The drain electrode of the MOSFET is electrically connected with the starting pin, and grid is electrically connected with the collector of the triode,
Source electrode ground connection；
The base stage of the triode is electrically connected with the signal input part of the control start-up circuit, emitter ground connection；
When the signal input part input high level signal, the triode ON, the MOSFET is not turned on, described
It is enabled to start pin, the first protection circuit is opened；
When the signal input part input low level signal, the triode is not turned on, the MOSFET conducting, described
Starting pin does not enable, and the first protection circuit is closed.
A kind of power protecting circuit provided by the embodiment of the utility model, comprising: the first protection circuit and power supply output electricity
Road, wherein the first protection circuit is electrically connected with power output circuit；Power output circuit, for powering；First protection circuit,
For providing short-circuit protection for power output circuit.Pass through technical solution provided by the embodiment of the utility model, power supply output electricity
When short circuit occurs, the first protection circuit will start short-circuit protection, and avoiding power output circuit because of short circuit leads to first device on road
Part burns problem even on fire.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the first structural schematic diagram of power protecting circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram of power output circuit provided by the embodiment of the utility model；
Fig. 3 is the first structural schematic diagram of the first protection circuit provided by the embodiment of the utility model；
Fig. 4 is second of structural schematic diagram of the first protection circuit provided by the embodiment of the utility model；
Fig. 5 is second of structural schematic diagram of power protecting circuit provided by the embodiment of the utility model；
Fig. 6 is the third structural schematic diagram of power protecting circuit provided by the embodiment of the utility model；
Fig. 7 is the third structural schematic diagram of the first protection circuit provided by the embodiment of the utility model；
Fig. 8 is a kind of structural schematic diagram of control start-up circuit provided by the embodiment of the utility model；
Fig. 9 is the 4th kind of structural schematic diagram of power protecting circuit provided by the embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Short-circuit protection is provided when short circuit occurs in order to realize, the utility model embodiment provides a kind of power protection electricity
Road, the power protecting circuit include: the first protection circuit and power output circuit, wherein the first protection circuit and power supply export
Circuit electrical connection；
Power output circuit, for powering；
First protection circuit, for providing short-circuit protection for power output circuit.
A kind of power protecting circuit provided by the embodiment of the utility model, comprising: the first protection circuit and power supply output electricity
Road, wherein the first protection circuit is electrically connected with power output circuit；Power output circuit, for powering；First protection circuit,
For providing short-circuit protection for power output circuit.Pass through technical solution provided by the embodiment of the utility model, power supply output electricity
When short circuit occurs, the first protection circuit will start short-circuit protection, and avoiding power output circuit because of short circuit leads to first device on road
Part burns problem even on fire.
A kind of power protecting circuit provided by the embodiment of the utility model is introduced below with reference to Fig. 1, such as Fig. 1 institute
Show, power protecting circuit 100 includes the first protection circuit 110 and power output circuit 120, wherein the first protection circuit 110 with
Power output circuit 120 is electrically connected, specifically, the output end of the first protection circuit 110 and the input terminal of power output circuit 120
Electrical connection.
Power output circuit 120 is for powering.A kind of implementation of power supply, power output circuit 120 include externally defeated
Outgoing interface, external output interface are electrically connected with peripheral apparatus, and power output circuit 120 passes through external output interface to peripheral apparatus
Power supply.Wherein, external output interface can be appointing in the different types form of terminal such as two line terminals forms, three line terminals forms
One kind, it is not limited here.
In a kind of embodiment, in order to avoid power output circuit 120 is by the impact of surge current, power output circuit
It can also include first diode in 120, wherein one end of first diode is electrically connected with power output circuit 120, a termination
Ground；I.e. power output circuit 120 is grounded by first diode.First diode is used for the wave in power output circuit 120
It gushes electric current to release to greatly, for example, first diode can be TVS, (Transient Voltage Suppressor, transient state press down
System) diode.Wherein, surge current is the biggish electric current of instantaneous electric energy, and surge current can be the generation of power output circuit 120
It is short-circuit and generation, caused by the moment that can also be the connection of power output circuit 120, it can also be what lightning stroke generated.When
So, the generation of surge current is not limited in three of the above.
When generating surge current in power output circuit 120, first diode will receive instantaneous high energy impact events.This
When, impedance value is become Low ESR from high impedance with the response speed being exceedingly fast by first diode, to absorb surge current, and then is made
Other components in power output circuit 120 avoid surging electric current impact and damage.
After first diode releases surge current, in order to reduce the residual voltage in power output circuit 120 to first
The influence of the generation of circuit 110 is protected, further includes the second diode in power output circuit 120, for example, the second diode can be
Schottky diode.Second diode is electrically connected with the first protection circuit 110.When there is also residual in power output circuit 120
When pressure, the one-way conduction of the second diode can prevent residual voltage from reversely inputting the first protection circuit 110, and then reduce residual voltage
Influence to the first protection circuit 110.
It can also include ground capacity in power output circuit 120, ground capacity one end is electrically connected with power output circuit 120
It connects, one end ground connection, ground capacity is used for energy storage.Wherein, the quantity of ground capacity can be customized.
A kind of structural schematic diagram of power output circuit 120 provided by the embodiment of the utility model, as shown in Fig. 2, power supply
The output interface JP1 of output circuit 120 including two line terminals, a TVS diode D1, a Schottky diode D2 and
Two ground capacities (C1 and C2).
First protection circuit 110, for providing short-circuit protection for power output circuit 120.Short-circuit protection includes overvoltage
Protection and/or overcurrent protection.
In a kind of embodiment, the first protection circuit 110 includes electronic switching tube, electronic switching tube be integrated with it is default
The component of function, for example, the model of electronic switching tube can be TPS25942, TPS25944 etc..Electronic switching tube includes electricity
Press input pin, voltage output pin, overvoltage protection pin.
Voltage input pin is electrically connected with voltage input end, i.e., voltage input end passes through voltage input pin and electronic cutting
Close pipe electrical connection.Voltage on voltage input pin is input voltage.Wherein, voltage input end is power protecting circuit 100
One end of input voltage.After input voltage is input to voltage input end, voltage input end will be inputted by voltage input pin
Voltage input is to electronic switching tube.
Voltage output pin is electrically connected with power output circuit 120, and electronic switching tube will be exported by voltage output pin
Voltage output is to power output circuit 120.Voltage, that is, output voltage on voltage output pin.
Overvoltage protection pin is electrically connected with the first divider resistance, which is electrically connected with voltage input pin
It connects.
First divider resistance can be variable resistance, can also be and is made of multiple resistance, it is not limited here.Its
In, multiple resistance can form the first divider resistance by series system, may be implemented to divide in this way.On overvoltage protection pin
The first branch pressure voltage voltage that be input voltage obtain after the first divider resistance partial pressure.
For example, the input voltage of power protecting circuit is+VIN, and IN pin is electricity as shown in figure 3, U1 is electronic switching tube
Input pin is pressed, OVP pin is overvoltage protection pin, and GND pin is grounding pin；Wherein, the first divider resistance is by resistance
R1, resistance R2 and resistance R3 are composed in series, and overvoltage protection pin is electrically connected R2 and R3.Therefore, on overvoltage protection pin
The relationship of first branch pressure voltage and input voltage are as follows:
Wherein, VOVPFor the first branch pressure voltage, VINFor input voltage.
Overvoltage in order to prevent, when the first branch pressure voltage on overvoltage protection pin is greater than preset first voltage threshold value
When, electronic switching tube starts overvoltage protection.
Wherein, first voltage threshold value can be customized.Specifically, first voltage threshold value can be according to required protection
The max-thresholds of input voltage determine that max-thresholds are customized setting.When input voltage is greater than the max-thresholds, electronics
Switching tube starts overvoltage protection.
For example, as shown in figure 3, the first voltage threshold value according to determined by the max-thresholds of input voltage are as follows:
Wherein, V(OVP-O)For first voltage threshold value, V(IN-O)For the max-thresholds of input voltage.When overvoltage protection pin
On the first branch pressure voltage be greater than V(OVP-O)When, i.e., input voltage is greater than V(IN-O)When, electronic switching tube starts overvoltage protection.
Electronic switching tube can disconnect the circuit connection inside electronic switching tube, in turn after starting overvoltage protection
The electrical connection of off voltage input pin and voltage output pin, the short trouble of smaller power output circuit is to voltage input
The influence of each circuit in pin side.After short trouble excludes, electronic switching tube can restore to be electrically connected, i.e., the electricity that will be disconnected before
Circuit inside sub switch pipe reconnects, and then restores the electrical connection of voltage input pin and voltage output pin, improves
The efficiency that fault restores.
In a kind of embodiment, electronic switching tube includes overcurrent protection pin；The overcurrent protection pin, passes through ground connection
Resistance eutral grounding.When earth current is greater than preset first current threshold, electronic switching tube starts overcurrent protection, earth current
To pass through the electric current of ground resistance.
Wherein, the first current threshold can be customized.Specifically, the first current threshold can be true by following formula
It is fixed:
Wherein, I(LIM)For the first current threshold, V(LIM)For the voltage value on overcurrent protection pin, R4 is ground resistance
Resistance value.V(LIM)For fixed value, I can be adjusted by adjusting R4(LIM)。
Electronic switching tube determines earth current by the voltage on detection ground resistance, i.e., is protected by detection of excessive current
Voltage on pin determines earth current, when earth current is greater than the first current threshold, electronic switching tube breaking inner
Circuit connection.After short trouble excludes, electronic switching tube can restore to be electrically connected, i.e., will be in the electronic switching tube that disconnected before
The circuit in portion reconnects.
For the first protection circuit 110, overvoltage protection only can be provided for power output circuit 120, at this point, electronic cutting
It closes pipe and only includes overvoltage protection pin；Overcurrent protection only can also be provided for power output circuit 120, at this point, electronic cutting
It closes pipe and only includes overcurrent protection pin；Overvoltage protection and overcurrent protection can also be provided for power output circuit 120, this
When, electronic switching tube includes overvoltage protection pin and overcurrent protection pin.
In a kind of embodiment, in order to be monitored in real time to the voltage in circuit, electronic switching tube further includes
Voltage indicates pin；Voltage indicates pin, is electrically connected with the second divider resistance, second divider resistance and voltage output pin electricity
Connection.
Wherein, the second divider resistance can be variable resistance, can also be and is made of multiple resistance, does not limit herein
It is fixed.Wherein, multiple resistance can form the second divider resistance by series system, may be implemented to divide in this way.Voltage instruction is drawn
The second branch pressure voltage on foot is the voltage that input voltage obtains after the second divider resistance partial pressure.
For example, OUT pin is voltage output pin, and PGTH pin refers to for voltage as shown in figure 4, output voltage is+VOUT
Show pin；Wherein, the second divider resistance is composed in series by resistance R5 and resistance R6, and voltage indicates that pin is electrically connected R5 and R6.Cause
This, voltage indicates the relationship of the second branch pressure voltage and output voltage on pin are as follows:
Wherein, VPGTHFor the second branch pressure voltage, VOUTFor output voltage.
When the second branch pressure voltage on voltage instruction pin is preset second voltage threshold value, by presetting indicating mode
Indicate that output voltage is normal.
Wherein, default indicating mode can be the mode of indicator light.For example, setting indicator light includes green light and red light, when
It indicates that output voltage is normal when indicator light is green light, indicates that output voltage is abnormal when indicator light is red light.Default instruction side
Formula can also be the mode of alarm, for example, alarm will not be rung when output voltage is normal, and indicate output voltage when alarm is rung
It is abnormal.
Wherein, second voltage threshold value can be customized.Specifically, second voltage threshold value can be according to output voltage
Preset threshold determines that the preset threshold of output voltage is customized setting.When output voltage is the preset threshold, voltage refers to
Show that pin is enabled, indicates that output voltage is normal by default indicating mode.
For example, as shown in figure 4, the second voltage threshold value according to determined by the preset threshold of output voltage are as follows:
Wherein, VPGTH-OFor second voltage threshold value, VOUT-OFor the preset threshold of output voltage.When on voltage instruction pin
Second branch pressure voltage is VPGTH-OWhen, i.e., output voltage is VOUT-OWhen, indicate that output voltage is normal by default indicating mode.
On the basis of above-mentioned Fig. 1 and Fig. 1 corresponding embodiment, as shown in figure 5, power protecting circuit 100 can also wrap
Include the second protection circuit 130；Second protection circuit 130 is electrically connected with the voltage input pin of the first protection circuit 110.Also
It is to say, input power protects the input voltage of circuit 100, by the second protection circuit 130 output to the first protection circuit 110
Voltage input pin, input voltage pass through voltage input pin again and are input to the first protection circuit 110, finally by the first protection electricity
Road 110 is exported to power output circuit 120, and by the output of power output circuit 120 to the peripheral apparatus connected.
Second protection circuit 130 is used to provide overcurrent protection for power output circuit 120.Second protection circuit 130 exists
First protection circuit 110 carries out overcurrent protection on the basis of providing short-circuit protection again, it is ensured that further reduces and protects to second
The influence of component in the rear stage circuit of protection circuit 130.In the case that the first protection circuit 110 fails, the second protection electricity
Road 130 can also provide overcurrent protection, and realization provides short-circuit protection when short circuit occurs.
In a kind of embodiment, the second protection circuit 130 includes thermistor, and thermistor is electrically connected with voltage input pin
It connects.Wherein, thermistor can be PTC (Positive Temperature Coefficient, positive temperature coefficient temperature-sensitive) electricity
Resistance.
The resistance value of thermistor increases with by the electric current increase in the thermistor.When a short circuit occurs, it passes through
The electric current for crossing thermistor increased dramatically, and cause the temperature of thermistor to rise, the resistance value of thermistor also increases sharply.When
The resistance value of thermistor is sufficiently large, it is believed that when the resistance value of thermistor is equivalent to the resistance value of off state, second is protected
Protection circuit 130 is in an off state, and reduces the short trouble of power output circuit 120 to upper the one of the second protection circuit 130
The influence of each circuit of grade.After short trouble releases, circuit restores normal, and the resistance value of thermistor also restores normal, it is ensured that
Second protection circuit restores normal, so that entire power protecting circuit restores normal.
Second protection circuit 130 can also include ground capacity, be used for energy storage.
On the basis of above-mentioned Fig. 1 and Fig. 1 corresponding embodiment, as shown in fig. 6, power protecting circuit 100 can also wrap
Control start-up circuit 140 is included, electronic switching tube further includes starting pin.
Start-up circuit 140 is controlled, is electrically connected with starting pin, is opened or closed for controlling electronic switching tube.Electronic cutting
When closing pipe unlatching, the first protection circuit 110 is in running order, can provide short-circuit protection for power output circuit 120；Electronics
When switching tube is closed, the first protection circuit 110 is in off working state, short-circuit protection is not provided, at this point, power output interface
It closes, output voltage will not be provided to peripheral apparatus.
In a kind of embodiment, control start-up circuit 140 includes MOSFET and triode；Wherein, the drain electrode of MOSFET with
Start pin electrical connection, grid is electrically connected with the collector of triode, source electrode ground connection；The base stage and control start-up circuit of triode
140 signal input part electrical connection, emitter ground connection.
This connection type of MOSFET and triode, whether triode is connected is determined by the low and high level of signal input part
, the voltage of the collector of triode determines whether MOSFET is connected.
When the high level of signal input part input, the base voltage of triode is greater than the emitter voltage of triode, and three
Pole pipe conducting.At this point, the collector and emitter equipotential of triode, i.e. the voltage phase of the collector and emitter of triode
Deng being zero.At this point, the grid voltage of MOSFET is equal to emitter voltage, MOSFET is not turned on.
When the low level of signal input part input, the base voltage of triode is not more than the emitter voltage of triode,
Triode is not turned on.At this point, the collector voltage of triode is greater than emitter voltage.At this point, the grid voltage of MOSFET is greater than
Emitter voltage, MOSFET conducting.
When MOSFET is not turned on, starting pin is enabled, and the first protection circuit 110 is opened.Specifically, when starting pin
When voltage reaches predetermined voltage threshold, the starting pin is enabled；When the voltage for starting pin is less than predetermined voltage threshold, then should
Starting pin does not enable.As shown in fig. 7, starting pin in the first divider resistance resistance R1 and resistance R2 be electrically connected, it is default
Voltage threshold is determined according to the following formula by the first divider resistance and input voltage:
Wherein, Ven is predetermined voltage threshold.In the case that MOSFET is not turned on, with VINWhen slowly increasing to Ven,
It is enabled to start pin, electronic switching tube is opened, and the first protection circuit 110 is opened.
When MOSFET conducting, the source electrode ground connection of MOSFET, drain electrode connects starting pin, and it is electric to start pin and source electrode etc. at this time
Gesture, i.e. starting pin are equivalent to ground connection, are less than predetermined voltage threshold Ven, and starting pin does not enable, and electronic switching tube is closed, the
One protection circuit 110 is closed.
Controlling start-up circuit 140 can also include ground resistance, and one end of the ground resistance is electrically connected with signal input part,
Other end ground connection.The ground resistance is used to provide initial low level when controlling start-up circuit 140 and starting to work, and then reduces just
Impact of the transient current of beginning to control start-up circuit 140.
Controlling start-up circuit 140 can also include ground capacity, and one end of the ground capacity is electrically connected with signal input part,
Other end ground connection.The ground capacity is used to control the filtering delay startup of start-up circuit 140.
For example, a kind of structural schematic diagram of control start-up circuit 140 as shown in Figure 8.Wherein, EN pin is that starting is drawn
Foot ,+VOUT_CTL are the signal of signal input part input, and Q1 MOSFET, Q2 are triode, and the collector of triode passes through electricity
Resistance R9 is electrically connected with voltage input pin, and C3 is ground capacity, and R7 is ground resistance, and the signal of signal input part input is by electricity
Resistance R8 is input to the base stage of triode.
A kind of power protecting circuit provided by the embodiment of the utility model, comprising: the first protection circuit and power supply output electricity
Road, wherein the first protection circuit is electrically connected with power output circuit；Power output circuit, for powering；First protection circuit,
For providing short-circuit protection for power output circuit.Pass through technical solution provided by the embodiment of the utility model, power supply output electricity
When short circuit occurs, the first protection circuit will start short-circuit protection, and avoiding power output circuit because of short circuit leads to first device on road
Part burns problem even on fire.
The utility model embodiment provides a kind of a kind of structural schematic diagram of power protecting circuit 100, as shown in figure 9, electric
Protection circuit 100 includes: the first protection circuit 110, the protection circuit 130 of power output circuit 120, second and control starting electricity
Road 140.
Wherein, power output circuit 120 includes: the output interface JP1 of two line terminals, TVS diode D1, one
A Schottky diode D2 and two ground capacities (C1 and C2).
First protection circuit 110 includes electronic switching tube U1, the first divider resistance (including R1, R2 and R3), the second partial pressure
Resistance (including R5 and R6) and ground resistance R4.Wherein, electronic switching tube includes voltage input pin, voltage output pin, mistake
Voltage protection pin, overcurrent protection pin, voltage instruction pin, starting pin and grounding pin.Overcurrent protection pin is logical
Cross ground resistance R4 ground connection.
Second protection circuit 130 includes ground capacity C4 and PTC resistor R10, and the voltage input end of power protecting circuit is logical
PTC resistor R10 is crossed to be electrically connected with the voltage input pin of electronic switching tube.
Control start-up circuit 140 include MOSFET Q1, triode Q2, ground capacity C3, ground resistance R7, resistance R8 and
R9。
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.
The above is only the preferred embodiment of the utility model only, is not intended to limit the protection model of the utility model
It encloses.Any modification, equivalent substitution, improvement and etc. made within the spirit and principle of the present invention, are all contained in this reality
With in novel protection scope.
Claims (10)
1. a kind of power protecting circuit, which is characterized in that the power protecting circuit includes: the first protection circuit and power supply output
Circuit, wherein the first protection circuit is electrically connected with the power output circuit；
The power output circuit, for powering；
The first protection circuit, for providing short-circuit protection for the power output circuit.
2. power protecting circuit according to claim 1, which is characterized in that the short-circuit protection includes: overvoltage protection
And/or overcurrent protection.
3. power protecting circuit according to claim 1, which is characterized in that the power output circuit includes the one or two pole
Pipe, the second diode；Wherein, the first diode ground connection, second diode are electrically connected with the first protection circuit；
The first diode is for releasing surge current.
4. power protecting circuit according to claim 1, which is characterized in that the first protection circuit includes electronic switch
Pipe, the first divider resistance, the electronic switching tube includes voltage input pin, voltage output pin, overvoltage protection pin；
The voltage input pin, is electrically connected with voltage input end, and the voltage input end will by the voltage input pin
Input voltage is input to the electronic switching tube；
The voltage output pin, is electrically connected with the power output circuit, and the electronic switching tube passes through the voltage output
Pin exports output voltage to the power output circuit；
The overvoltage protection pin, is electrically connected with the first divider resistance, and first divider resistance draws with the voltage input
Foot electrical connection；
When the first branch pressure voltage on the overvoltage protection pin is greater than preset first voltage threshold value, the electronic switch
Pipe starts overvoltage protection, first branch pressure voltage are as follows: the input voltage obtains after first divider resistance partial pressure
The voltage arrived.
5. power protecting circuit according to claim 4, which is characterized in that the electronic switching tube includes overcurrent protection
Pin；
The overcurrent protection pin, passes through ground resistance earth；
When earth current is greater than preset first current threshold, the electronic switching tube starts overcurrent protection, the ground connection
Electric current is the electric current by the ground resistance.
6. power protecting circuit according to claim 4, which is characterized in that the electronic switching tube further includes voltage instruction
Pin and the second divider resistance；
The voltage indicates pin, is electrically connected with the second divider resistance, second divider resistance and the voltage output pin
Electrical connection；
When the second branch pressure voltage on voltage instruction pin is preset second voltage threshold value, by presetting indicating mode
Indicate that the output voltage is normal, second branch pressure voltage are as follows: the output voltage is divided by second divider resistance
The voltage obtained afterwards.
7. power protecting circuit according to claim 4, which is characterized in that the power protecting circuit further include: second
Protect circuit；
The second protection circuit is electrically connected, for being the electricity with the voltage input pin of the first protection circuit
Source follower circuit provides overcurrent protection.
8. power protecting circuit according to claim 7, which is characterized in that the second protection circuit includes temperature-sensitive electricity
Resistance, the thermistor are electrically connected with the voltage input pin.
9. power protecting circuit according to claim 7, which is characterized in that the power protecting circuit further include: control
Start-up circuit；The electronic switching tube further includes starting pin；
The control start-up circuit is electrically connected with the starting pin, opens or closes for controlling the electronic switching tube.
10. power protecting circuit according to claim 9, which is characterized in that the control start-up circuit includes golden oxygen half
Field-effect transistor MOSFET, triode；
The drain electrode of the MOSFET is electrically connected with the starting pin, and grid is electrically connected with the collector of the triode, source electrode
Ground connection；
The base stage of the triode is electrically connected with the signal input part of the control start-up circuit, emitter ground connection；
When the signal input part input high level signal, the triode ON, the MOSFET is not turned on, the starting
Pin is enabled, and the first protection circuit is opened；
When the signal input part input low level signal, the triode is not turned on, the MOSFET conducting, the starting
Pin does not enable, and the first protection circuit is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820729446.1U CN208272621U (en) | 2018-05-16 | 2018-05-16 | A kind of power protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820729446.1U CN208272621U (en) | 2018-05-16 | 2018-05-16 | A kind of power protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208272621U true CN208272621U (en) | 2018-12-21 |
Family
ID=64681628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820729446.1U Active CN208272621U (en) | 2018-05-16 | 2018-05-16 | A kind of power protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208272621U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112423178A (en) * | 2020-10-22 | 2021-02-26 | 国网浙江省电力有限公司双创中心 | Communication device for live working process of ultra-high voltage transmission line |
| CN113448422A (en) * | 2021-05-28 | 2021-09-28 | 山东英信计算机技术有限公司 | Server BIOS flash memory chip protection circuit and server |
| TWI796229B (en) * | 2022-05-26 | 2023-03-11 | 神雲科技股份有限公司 | power supply protection system |
-
2018
- 2018-05-16 CN CN201820729446.1U patent/CN208272621U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112423178A (en) * | 2020-10-22 | 2021-02-26 | 国网浙江省电力有限公司双创中心 | Communication device for live working process of ultra-high voltage transmission line |
| CN112423178B (en) * | 2020-10-22 | 2022-11-01 | 国网浙江省电力有限公司双创中心 | Communication device for live working process of ultra-high voltage transmission line |
| CN113448422A (en) * | 2021-05-28 | 2021-09-28 | 山东英信计算机技术有限公司 | Server BIOS flash memory chip protection circuit and server |
| TWI796229B (en) * | 2022-05-26 | 2023-03-11 | 神雲科技股份有限公司 | power supply protection system |
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