CN208707289U - A kind of power protecting circuit and vehicle power supply protective device - Google Patents
A kind of power protecting circuit and vehicle power supply protective device Download PDFInfo
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- CN208707289U CN208707289U CN201821687295.4U CN201821687295U CN208707289U CN 208707289 U CN208707289 U CN 208707289U CN 201821687295 U CN201821687295 U CN 201821687295U CN 208707289 U CN208707289 U CN 208707289U
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Abstract
The utility model provides a kind of power protecting circuit and vehicle power supply protective device; power protecting circuit includes power switching module, switch control module and short-circuit detecting module; switch control module is electrically connected with power switching module and short-circuit detecting module respectively; power switching module is electrically connected with short block, and switch control module receives the on-off of the short-circuit signal control power switching module of control signal or/and the detection of short-circuit detecting module.The utility model provides a kind of power protecting circuit and vehicle power supply protective device, to realize automatic control and the short-circuit protection function of power supply.
Description
Technical field
The utility model relates to integrated circuit fields, protect in particular to a kind of power protecting circuit and vehicle power supply
Protection unit.
Background technique
With the development of new energy and intelligent driving technology, the equipment of automobile central control system access is more and more, to system
Security and stability is further stringent, and automobile factory is for more stringent requirements are proposed in terms of the safety of vehicle device electric property.It is defeated to vehicle device
The protection of power supply mainly uses installation insurance silk to carry out circuit safety protection out, is existed using fuse mode and repairs troublesome ask
Topic.
Utility model content
The purpose of this utility model is to provide a kind of power protecting circuit and vehicle power supply protective devices, to realize power supply
Automatic control and short-circuit protection function.
The utility model is realized in this way:
The utility model provides a kind of power protecting circuit, and power protecting circuit includes power switching module, switch control
Module and short-circuit detecting module, the switch control module are electric with the power switching module and the short-circuit detecting module respectively
Connection, the power switching module be electrically connected with the short block, and the switch control module reception controls signal and/or short
Road signal, to control the on-off of the power switching module, the short-circuit signal is the signal of short-circuit detecting module output.
Optionally, it is described to open when the switch control module receives the control signal and the short-circuit signal simultaneously
Control module is closed to respond the short-circuit signal and shield the control signal.
Optionally, the power switching module includes metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor and the switch control module
Output end electrical connection, the source electrode and drain electrode of the metal-oxide-semiconductor wherein input terminal of the one end as the power switching module are described
Output end of the source electrode and drain electrode other end of metal-oxide-semiconductor as the power switching module.
Optionally, the metal-oxide-semiconductor includes the first PMOS tube, and the power switching module further includes first resistor and the second electricity
Resistance, the source electrode of first PMOS tube is electrically connected with one end of the first resistor and the input as the power switching module
End, output end of the drain electrode of first PMOS tube as the power switching module, the grid difference of first PMOS tube
It is electrically connected with one end of the other end of the first resistor and the second resistance, the other end of the second resistance is opened with described
Close control module electrical connection.
Optionally, the power switching module further includes first capacitor, one end of the first capacitor and described first
The source electrode of PMOS tube is electrically connected, the other end of the first capacitor be electrically connected.
Optionally, the switch control module includes 3rd resistor and the first NPN type triode, one end of three resistance
As the input terminal of the switch control module, the base stage of the other end of the 3rd resistor and first NPN type triode
Electrical connection, the emitter of first NPN type triode be electrically connected, the collector conduct of first NPN type triode
The output end of the switch control module is electrically connected with the other end of the second resistance.
Optionally, the switch control module further includes the 4th resistance, described 4th resistance one end and first NPN type
The base stage of triode is electrically connected, the 4th resistance other end be electrically connected.
Optionally, the short-circuit detecting module includes first diode, the anode and described first of the first diode
The base stage of NPN type triode is electrically connected, and the first diode cathode is electrically connected with the drain electrode of first PMOS tube.
Optionally, the power protecting circuit further includes first switch and the second diode, and second diode is just
Pole is electrically connected with the drain electrode of first PMOS tube, and the cathode of second diode and one end of the first switch are electrically connected
It connects, the other end of the first switch is electrically connected with the cathode of the first diode.
The utility model also provides a kind of vehicle power supply protective device, and vehicle power supply protective device includes power protection electricity
Road.
Compared with the prior art, the utility model has the following beneficial effects: a kind of power protection provided by the utility model
Circuit and vehicle power supply protective device automatic control power supply and can have short-circuit protection function.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.Therefore, below to attached
The detailed description of the embodiments of the present invention provided in figure is not intended to limit the range of claimed invention,
But it is merely representative of the selected embodiment of the utility model.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without creative efforts, belongs to the model of the utility model protection
It encloses.
Fig. 1 shows a kind of structural schematic diagram for protecting circuit provided by the utility model；
Fig. 2 shows a kind of circuit diagrams of power switching module provided by the utility model；
Fig. 3 shows a kind of circuit diagram of switch control module provided by the utility model；
Fig. 4 shows a kind of circuit diagram of power protecting circuit provided by the utility model；
Fig. 5 shows the circuit diagram of another power protecting circuit provided by the utility model.
Primary symbols explanation:
100- power protecting circuit；110- power switching module；120- switch control module；130- short-circuit detecting module；
R1- first resistor；R2- second resistance；R3- 3rd resistor；The 4th resistance of R4-；The first PMOS tube of Q1-；Q2- first
NPN type triode；D1- first diode；The second diode of D2-；F1- first switch；
VCC- power supply；Vin- controls signal；Vout- voltage；GND-.
Specific embodiment
Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can be come with a variety of different configurations
Arrangement and design.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below
The range of claimed invention, but it is merely representative of the selected embodiment of the utility model.Based on the utility model
Embodiment, those skilled in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
Referring to FIG. 1, the utility model provides a kind of embodiment of the power protecting circuit 100 of suspension control signal control.
The power protecting circuit 100 of the utility model includes power switching module 110, switch control module 120 and short-circuit detecting module
130,110 input terminal of power switching module is electrically connected with power supply VCC, switch control module 120 respectively with power switching module 110
It is electrically connected with short-circuit detecting module 130, power switching module 110 is electrically connected with short-circuit detecting module 130, the switch control mould
Block 120 receives control signal and/or short-circuit signal, and to control the on-off of the power switching module 110, the short-circuit signal is
The signal that the short-circuit detecting module 130 exports.
In the following, control signal and/or short-circuit signal are received for the switch control module 120, to power switching module
Three kinds of scenes of 110 progress on-off controls are illustrated.
Scene one
Switch control module 120 receives control signal, to control the on-off of the power switching module 110.In this scene
In, 110 input terminal of power switching module is electrically connected to a power source, and power switching module main function is protection power source output circuit
Safety, using the on-off of control power supply output come protection power source output.Switch control module 120 works normally lower receive and controls letter
Number, and the on-off of control power switching module 110 is gone in the control of responsive control signal, and when such as control signal is low level, switch
Control module 120 controls power switching module 110 and disconnects, and specifically how to go to control according to control signal, be not construed as limiting here.
Scene two
Switch control module 120 receives short-circuit signal, to control the on-off of the power switching module 110.In this scene
In, 110 input terminal of power switching module is electrically connected to a power source, and 110 main function of power switching module is protection power source output electricity
The safety on road.In abnormal cases, switch control module 120 responds the control of short-circuit signal, to control power switching module 110
On-off, when that is to say that switch control module 120 receives the short-circuit signal of short-circuit detecting module 130, at this point, switch control mould
Block 120 responds short-circuit signal, and control power switching module 110 disconnects, by this method protection power source output short-circuit situation.Short circuit inspection
It surveys module 130 to connect with the output end of power switching module 110, that is to say and connected with load end, when there are short-circuit conditions, short circuit
130 first time of detection module detects short-circuit signal, and short-circuit signal is fed back to switch control module 120, thus first
Time controls power switching module 110 and disconnects, and plays the role of short-circuit protection.
Scene three
Switch control module 120 receives control signal and short-circuit signal simultaneously, to control the power switching module 110
On-off.In the present embodiment, 110 input terminal of power switching module is electrically connected to a power source, and 110 main function of power switching module is
The safety of protection power source output circuit, using the on-off of control power supply output come protection power source output.Switch control module 120 is just
Suspension control signal is often connect under work, and the on-off of control power switching module 110 is gone in the control of responsive control signal, in abnormal feelings
Under condition, when that is to say that switch control module 120 receives the short-circuit signal of short-circuit detecting module, at this time in spite of receive control
Signal processed, switch control module 120 respond short-circuit signal, and control power switching module 110 disconnects, and protection power source is defeated by this method
Short-circuit conditions out.Short-circuit detecting module 130 is connect with the output end of power switching module 110, be that is to say and is connected with load end, out
When existing short-circuit conditions, 130 first time of short-circuit detecting module detects short-circuit signal, and short-circuit signal is fed back to switch control
Module 120 plays the role of short-circuit protection so that control power switching module 110 disconnects at the first time.
The implementation of power protecting circuit 100 is realized in the control of switch control module 120 when the utility model provides a kind of short circuit
Example, specifically, when switch control module 120 receives control signal Vin and short-circuit signal simultaneously, 120 sound of switch control module
It answers short-circuit signal and shields control signal Vin.In the present embodiment, during power supply normally exports, short circuit is had occurred in load,
When switch control module 120 is detected simultaneously by control signal and short-circuit signal, at this point, switching circuit can mask control signal,
Short-circuit signal is responded, control power switching module 110 disconnects, and protects circuit Electrical Safety.The shielding control of switch control module 120
The mode of signal has very much, is such as inputted using multichannel, when switching circuit detects short-circuit signal, does not receive control signal, or
Short-circuit signal circuit and control signal circuit interconnect, and control signal directly can be drawn high or be dragged down by short-circuit signal.
The utility model provides a kind of 110 embodiment of power switching module using metal-oxide-semiconductor, specifically, power switch mould
Block 110 includes metal-oxide-semiconductor, and the grid of metal-oxide-semiconductor is electrically connected with the output end of switch control module 120, the source electrode and drain electrode of metal-oxide-semiconductor its
Input terminal of the middle one end as power switching module 110 is connected to power supply VCC, and the source electrode and drain electrode other end of metal-oxide-semiconductor is as electricity
The output end output voltage Vout of source switch module 110.
In the present embodiment, power switching module 110 realizes the on-off of circuit, the source electrode and drain electrode of metal-oxide-semiconductor using metal-oxide-semiconductor
As input terminal and output end, the on-off of metal-oxide-semiconductor can be controlled by applying a voltage in the grid of metal-oxide-semiconductor, herein it will be appreciated that
This on-off function also can be equally realized using triode, and metal-oxide-semiconductor is particularly suited for the control of on-off with respect to triode, because of metal-oxide-semiconductor
It is mainly used for voltage control, is able to use in metal-oxide-semiconductor for high-frequency high-speed circuit, high current situation, and to base stage or drain electrode
Electric current is controlled than in more sensitive circuit and metal-oxide-semiconductor cost is relatively low.
The utility model provides a kind of 110 embodiment of power switching module using PMOS tube, shown referring to figure 2., tool
Body, power switching module 110 includes the first PMOS tube Q1, first resistor R1 and second resistance R2, the source of the first PMOS tube Q1
Pole is electrically connected with one end of first resistor R1 and the input terminal as power switching module 110, is connected to power supply VCC, and first
Grid difference of the drain electrode of PMOS tube Q1 as output end the output voltage Vout, the first PMOS tube Q1 of power switching module 110
It is electrically connected with one end of the other end of first resistor R1 and second resistance R2, the other end and switch control module of second resistance R2
120 electrical connections.
In the present embodiment, switch control module 120 receives control signal and exports low level to one end of second resistance R2,
Since the input terminal of power switching module 110 is electrically connected with power supply VCC, the partial pressure of first resistor R1 and second resistance R2, first
The grid voltage of PMOS tube Q1 is pulled low, therefore the first PMOS tube Q1 is connected, power circuit normal output voltage；Switch control mould
Block 120 does not receive control signal and high-impedance state is presented and exports to one end of second resistance R2, at this time since second resistance R2 is suitable
A big resistance is connect under, so that the grid voltage of the first PMOS tube Q1 is approximately equal to supply voltage, the first PMOS tube Q1 is not led
Logical, power circuit is without output voltage, to realize that controlling power circuit exports.When switch control module 120 receives short-circuit signal
High-impedance state is presented and exports to one end of second resistance R2, switch control module 120 controls the first PMOS tube Q1 and is not turned on, power supply
Circuit is without output voltage, to realize that controlling power circuit exports.And it is relatively low using metal-oxide-semiconductor cost.
On the basis of above 110 embodiment of power switching module using PMOS tube, the utility model is further mentioned
For a kind of 110 embodiment of power switching module using PMOS tube, specifically, referring to shown in Fig. 4, power switching module 110 is also
Including first capacitor C1, one end of first capacitor C1 is electrically connected with the source electrode of the first PMOS tube Q1, the other end of first capacitor C1
It is electrically connected with ground GND.In the present embodiment, first capacitor C1 is for filtering interference signal in circuit, specifically, first capacitor C1
With first resistor R1 form filter circuit, in DC circuit, filter alternating component be it is highly important, prevent interference signal pair
Backend load generates harm, and in addition first capacitor C1 also acts as the effect for stablizing the first operating point PMOS tube Q1.Use triode
Hardware cost can be further decreased.
The utility model also provides a kind of embodiment of switch control module 110, shown referring to figure 3., specifically, switch
Control module 120 includes 3rd resistor R3 and the first NPN type triode Q2, and one end of 3rd resistor R3 is as switch control module
120 input terminal Vin, the other end of 3rd resistor R3 are electrically connected with the base stage of the first NPN type triode Q2, the first NPN type three
The emitter of pole pipe Q2 is electrically connected with ground GND, and the collector of the first NPN type triode Q2 is as the defeated of switch control module 120
Outlet is electrically connected with the other end of second resistance R2.
In the present embodiment, switch control module 120 receives control signal or/and short-circuit signal by its input terminal Vin
Output is realized control and output using the first NPN type triode Q2, is made after the base series resistor of the first NPN type triode Q2
Control signal is received for input terminal Vin, conductive and nonconductive, the third of the first NPN type triode Q2 is controlled by control signal
The effect of resistance R3 not only can protect the first NPN type triode Q2, prevent the control signal code of input is excessive from causing to damage
First NPN type triode Q2, another aspect 3rd resistor R3 keep apart the control signal and short-circuit signal of input, short-circuit signal
It is equivalent to earth signal, short-circuit signal can drag down the base stage of the first NPN type triode Q2 herein, control three pole of the first NPN type
Pipe Q2 is in not on-state, so that 110 interrupting power circuit of power switching module exports, to protect circuit safety.
On the basis of the embodiment of the above switch control module 120, the utility model further provides for a kind of switch control
The embodiment of module 120, shown referring to figure 3., specifically, switch control module 120 further includes the 4th resistance R4, the 4th resistance
The one end R4 is electrically connected with the base stage of the first NPN type triode Q2, and the 4th resistance R4 other end is electrically connected with ground GND.In this implementation
In example, control signal is supplied to the base stage control of the first NPN type triode Q2 by 3rd resistor R3 and the 4th resistance R4 partial pressure
Signal provides the base voltage of more stable triode, and the 4th resistance R4 is connected to ground, while can reinforce the anti-dry of input terminal
Disturb ability.What needs to be explained here is that being also able to achieve the effect of triode using metal-oxide-semiconductor, the benefit for being used herein as triode exists
Low-voltage is generally presented in control signal, is suitble to use triode, cost can reduce using triode control.
The utility model provides a kind of embodiment of power protecting circuit 100, shown referring to figure 4., specifically, the power supply
Protecting circuit 100 includes short-circuit detecting module 130, and short-circuit detecting module 130 includes first diode D1, first diode D1's
Anode is electrically connected with the base stage of the first NPN type triode Q2, and first diode D1 cathode and the drain electrode of the first PMOS tube Q1 are electrically connected
It connects.In the present embodiment, short-circuit detecting module 130 includes a first diode D1, when circuit works normally, due to circuit
High voltage is presented in output end, even if also the cathode of first diode D1 is high voltage, just extremely low-voltage, first diode D1 is not
Conducting, therefore generated without short-circuit signal；When short circuit occurs for load, the cathode ground connection of first diode D1, just extremely high level,
Therefore first diode D1 conducting, first diode D1 are equivalent to ground connection, are reacted to the first NPN type of switch control module 120
The base signal of triode Q2 is earth signal, therefore the first NPN type triode Q2 is not turned on, to control power switching module
110 disconnect, and play the role of short-circuit protection.
The utility model provides a kind of embodiment of short-circuit detecting module 130, shown referring to figure 5., the utility model
Power protecting circuit 100 includes power switching module 110, switch control module 120 and short-circuit detecting module 130, switch control
Module 120 is electrically connected with power switching module 110 and short-circuit detecting module 130 respectively, power switching module 110 and short-circuit detecting
Module 130 is electrically connected, the short circuit letter that switch control module 120 receives control signal Vin or/and short-circuit detecting module 130 detects
Number control power switching module 110 on-off.Power switching module 110 includes the first PMOS tube Q1, first capacitor C1, the first electricity
Resistance R1 and second resistance R2, the source electrode of the first PMOS tube Q1 are electrically connected and as power switching module with one end of first resistor R1
110 input terminal, is connected to power supply VCC, output end of the drain electrode of the first PMOS tube Q1 as power switching module 110, and first
The grid of PMOS tube Q1 is electrically connected with one end of the other end of first resistor R1 and second resistance R2 respectively, and second resistance R2's is another
One end is electrically connected with switch control module 120, and one end of first capacitor C1 is electrically connected with the source electrode of the first PMOS tube Q1, the first electricity
The other end for holding C1 is electrically connected with ground GND；Switch control module 120 includes 3rd resistor R3, the 4th resistance R4 and the first NPN type
Input terminal of the one end of triode Q2,3rd resistor R3 as switch control module 120, the other end of 3rd resistor R3 and first
The base stage of NPN type triode Q2 is electrically connected, and the emitter of the first NPN type triode Q2 is electrically connected with ground GND, the first NPN type three
The collector of pole pipe Q2 is electrically connected as the output end of switch control module 120 with the other end of second resistance R2, the 4th resistance
The one end R4 is electrically connected with the base stage of the first NPN type triode Q2, and the 4th resistance R4 other end is electrically connected with ground GND；Short-circuit detecting
Module 130 includes first diode D1, and the anode of first diode D1 is electrically connected with the base stage of the first NPN type triode Q2, the
The cathode pole of one diode D1 is connected to power output end Vout；Power protecting circuit 100 further includes first switch F1 and second
The anode of diode D2, the second diode D2 are electrically connected with the drain electrode of the first PMOS tube Q1, the cathode of the second diode D2 and the
One end of one switch F1 is electrically connected, and the other end of first switch F1 and the cathode of first diode D1 and power output end Vout are equal
Electrical connection.
In the present embodiment, it controls signal and short-circuit signal inputs the base stage of the first NPN type triode Q2 respectively, work as load
When short-circuit, first diode D1 conducting, the base stage of the first NPN type triode Q2 is pulled to ground, therefore the first NPN type triode Q2
In not on-state, high state is exported, the grid voltage of the first PMOS tube Q1 is close to supply voltage, so that at the first PMOS tube Q1
In being not turned on, therefore circuit output is equivalent to disconnection, plays the effect of protection short circuit；Under normal operation, short circuit letter
Number effect do not generated to the base stage of the first NPN type triode Q2, the base stage of the first NPN type triode Q2 receives control signal control
First NPN type triode Q2 is connected or is not turned on, and works as on state, due to the series resistance partial pressure on the first PMOS tube Q1, makes
The grid voltage for obtaining the first PMOS tube Q1 is pulled low, therefore the first PMOS tube Q1 is connected, normal output voltage；When control signal control
When making the first NPN type triode Q2 and being not turned on, it is equivalent to short-circuit signal effect, the suitable power supply of grid voltage of the first PMOS tube Q1
Voltage, the first PMOS tube Q1 is not turned on, therefore power circuit is without output voltage.Output of the present embodiment in the first PMOS tube Q1
End series connection the second diode D2 and first switch F1, the electric current excessive damage to power protecting circuit when on the one hand preventing short circuit
It is bad, on the other hand, the hard closing of power circuit output can be realized by first switch F1, plays the role of duplicate protection.It uses
First PMOS tube Q1 and the first NPN type triode Q2 realizes automatic control power supply output and short-circuit protection.Using metal-oxide-semiconductor and three poles
Pipe realizes that control circuit further reduces costs.
The embodiments of the present invention also provide a kind of apparatus for protecting power supply, and apparatus for protecting power supply includes power protecting circuit
100, waterproof circuit and processor, power output end are electrically connected after being electrically connected with power protecting circuit 100 with waterproof circuit,
Under water occurs and reveals, waterproof circuit input signal exports control signal to electricity according to the signal of input to processor, processor
Source circuit protective device, thus the output of controlling power circuit.
To sum up, power protecting circuit and vehicle power supply protective device provided by the utility model, power protecting circuit include
Power switching module, switch control module and short-circuit detecting module, switch control module respectively with power switching module and short circuit
Detection module electrical connection, power switching module are electrically connected with short block, and switch control module receives control signal or/and short circuit
The on-off of the short-circuit signal control power switching module of detection module detection.The utility model provide a kind of power protecting circuit and
Vehicle power supply protective device realizes automatic control and the short-circuit protection function of power supply, reduces costs simultaneously.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection,
Or it is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, intermediary can also be passed through
It is indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, it can be managed with concrete condition
Solve the concrete meaning of above-mentioned term in the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " on ", "lower", "left", "right", "inner", "outside" etc.
The orientation or positional relationship of instruction be based on the orientation or positional relationship shown in the drawings or the utility model product use when
The orientation or positional relationship usually put, is merely for convenience of describing the present invention and simplifying the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
The limitation of the utility model.The above descriptions are merely preferred embodiments of the present invention, and it is practical new to be not limited to this
Type, for those skilled in the art, the present invention may have various modifications and changes.All essences in the utility model
Mind and principle within, any modification, equivalent replacement, improvement and so on, should be included in the protection scope of the utility model it
It is interior.
Claims (10)
1. a kind of power protecting circuit, which is characterized in that including power switching module, switch control module and short-circuit detecting mould
Block, the switch control module are electrically connected with the power switching module and the short-circuit detecting module respectively, and the power supply is opened
Module is closed to be electrically connected with the short-circuit detecting module；
The switch control module receives control signal and/or short-circuit signal, to control the on-off of the power switching module, institute
State the signal that short-circuit signal is short-circuit detecting module output.
2. power protecting circuit as described in claim 1, which is characterized in that the switch control module receives described simultaneously
When controlling signal and the short-circuit signal, the switch control module responds the short-circuit signal and shields the control signal.
3. power protecting circuit as described in claim 1, which is characterized in that the power switching module includes metal-oxide-semiconductor, described
The grid of metal-oxide-semiconductor is electrically connected with the output end of the switch control module, the wherein one end conduct of the source electrode and drain electrode of the metal-oxide-semiconductor
The input terminal of the power switching module, the source electrode and drain electrode other end of the metal-oxide-semiconductor is as the defeated of the power switching module
Outlet.
4. power protecting circuit as claimed in claim 3, which is characterized in that the metal-oxide-semiconductor includes the first PMOS tube, the electricity
Source switch module further includes first resistor and second resistance, and the source electrode of first PMOS tube and one end of the first resistor are electric
It connects and the input terminal as the power switching module, first PMOS tube drains as the power switching module
Output end, the one end of the grid of first PMOS tube respectively with the other end of the first resistor and the second resistance are electrically connected
It connects, the other end of the second resistance is electrically connected with the switch control module.
5. power protecting circuit as claimed in claim 4, which is characterized in that the power switching module further includes the first electricity
Hold, one end of the first capacitor is electrically connected with the source electrode of first PMOS tube, the other end ground connection of the first capacitor.
6. power protecting circuit as claimed in claim 5, which is characterized in that the switch control module include 3rd resistor and
First NPN type triode, input terminal of the one end of the 3rd resistor as the switch control module, the 3rd resistor
The other end is electrically connected with the base stage of first NPN type triode, the emitter ground connection of first NPN type triode, described
The collector of first NPN type triode is electrically connected as the output end of the switch control module and the other end of the second resistance
It connects.
7. power protecting circuit as claimed in claim 6, which is characterized in that the switch control module further includes the 4th electricity
Resistance, described 4th resistance one end are electrically connected with the base stage of first NPN type triode, the 4th resistance other end ground connection.
8. power protecting circuit as claimed in claim 7, which is characterized in that the short-circuit detecting module includes the one or two pole
Pipe, the first diode anode be electrically connected with the base stage of first NPN type triode, the first diode cathode and
The drain electrode of first PMOS tube is electrically connected.
9. power protecting circuit as claimed in claim 8, which is characterized in that the power protecting circuit further includes first switch
It is electrically connected with the anode of the second diode, second diode with the drain electrode of first PMOS tube, second diode
Cathode be electrically connected with one end of the first switch, the negative electricity of the other end of the first switch and the first diode
Connection.
10. a kind of vehicle power supply protective device, which is characterized in that the vehicle power supply protective device includes such as claim 1-9
Power protecting circuit described in any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821687295.4U CN208707289U (en) | 2018-10-17 | 2018-10-17 | A kind of power protecting circuit and vehicle power supply protective device |
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| CN201821687295.4U CN208707289U (en) | 2018-10-17 | 2018-10-17 | A kind of power protecting circuit and vehicle power supply protective device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113335203A (en) * | 2021-04-09 | 2021-09-03 | 深圳市豪恩汽车电子装备股份有限公司 | Quick power supply and exception handling circuit for vehicle-mounted ECU |
| CN113964787A (en) * | 2021-11-04 | 2022-01-21 | 广东远通工业科技有限公司 | Protection circuit of sensor |
| CN114720724A (en) * | 2022-03-25 | 2022-07-08 | 中汽创智科技有限公司 | Wheel speed sensor diagnosis device, method and system and vehicle |
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2018
- 2018-10-17 CN CN201821687295.4U patent/CN208707289U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113335203A (en) * | 2021-04-09 | 2021-09-03 | 深圳市豪恩汽车电子装备股份有限公司 | Quick power supply and exception handling circuit for vehicle-mounted ECU |
| CN113335203B (en) * | 2021-04-09 | 2022-10-28 | 深圳市豪恩汽车电子装备股份有限公司 | Quick power supply and exception handling circuit for vehicle-mounted ECU |
| CN113964787A (en) * | 2021-11-04 | 2022-01-21 | 广东远通工业科技有限公司 | Protection circuit of sensor |
| CN113964787B (en) * | 2021-11-04 | 2023-08-04 | 广东远通工业科技有限公司 | Protection circuit of sensor |
| CN114720724A (en) * | 2022-03-25 | 2022-07-08 | 中汽创智科技有限公司 | Wheel speed sensor diagnosis device, method and system and vehicle |
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