CN206727645U - A kind of direct-current charging post bus bleed-off circuit protection circuit - Google Patents
A kind of direct-current charging post bus bleed-off circuit protection circuit Download PDFInfo
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- CN206727645U CN206727645U CN201720172004.7U CN201720172004U CN206727645U CN 206727645 U CN206727645 U CN 206727645U CN 201720172004 U CN201720172004 U CN 201720172004U CN 206727645 U CN206727645 U CN 206727645U
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Abstract
The utility model provides a kind of direct-current charging post bus bleed-off circuit protection circuit, the control of driving pulsewidth is realized by RC charging principles, to reach the purpose of protection circuit.This protection circuit is mainly by electric capacity C1 charging interval, to control the pulsewidth of drive signal.So, when drive signal fails, (permanent High level) can realize the excision of discharge loop by hardware circuit.The utility model is mainly used in the bus bleed-off circuit of automobile charging pile.
Description
Technical field
Charging electric vehicle field is the utility model is related to, is protected more particularly to a kind of direct-current charging post bus bleed-off circuit
Protection circuit.
Background technology
State Council issues《" 13 " national strategy new industry development plan》, planning is pointed out, to be substantially improved new
The application percentage of energy automobile and new energy, the green low-carbon industries such as new-energy automobile, new energy and energy-conserving and environment-protective are promoted to turn into
Pillar industry.Electric automobile charging pile is a kind of electric supply installation that power supply is provided for New-energy electric vehicle Vehicular charger, is filled
After electric stake Insulation monitoring, charging output voltage should be released in time, avoid producing voltage to cell load in the charging stage
Impact.After charging terminates, charging pile should release to charging output voltage in time, avoid causing electric injury to operating personnel
Evil.Bleed-off circuit should ensure that drops to below 60V DC in 1 second after charge connector disconnection by power supply interface voltage.
Common electric discharge drive circuit is as shown in figure 1, relay RELAY main contacts AB and discharge resistance connect, then
And it is connected to dc bus both ends.When C-terminal receives the drive signal from controller, Q1 triode ONs, relay coil obtains
Electricity, contact A B closures, starts to bus discharge, drive signal becomes low level after 1 second.
Fig. 1 circuits disclosure satisfy that the requirement of charging pile electric discharge, but because charging pile inside electromagnetic environment is more complicated, control
Device processed may be caused program fleet by electromagnetic interference and then make driving pulse long, if now bleed-off circuit closes lead always
It is logical, and charging pile rectification module persistently exports DC750V voltage, the resistance and relay in bleed-off circuit are just easy to burn.
Traditional protected mode is to increase house dog program in software, is resetted in time when program fleet, but this is still inevitable
Software failure causes discharge resistance to burn.
The content of the invention
The utility model is directed to a kind of simple protection circuit, and the control of driving pulsewidth is realized by RC charging principles
System, to reach the purpose of protection circuit.The utility model is mainly used in the bus bleed-off circuit of automobile charging pile.The direct current fills
Electric stake bus bleed-off circuit protection circuit, including：Relay RELAY, switching tube Q1, Q2, resistance R1, R2, R3, R4, Yi Ji electricity
Hold C1 and voltage-stabiliser tube D1, wherein：Resistance R4 one end is connected with drive pulse signal, the other end and voltage-stabiliser tube D1 and resistance R3 and
Switching tube Q2 connects, and resistance R2 one end connection drive pulse signal, the other end connects resistance R1 and switching tube Q2 parallel connected end；Electricity
The resistance R1 other end is connected with switching tube Q1, and switching tube Q1 is connected with relay RELAY, and two are bridged at relay RELAY both ends
Pole pipe, electric capacity C1 one end are connected with voltage-stabiliser tube D1, and the other end is connected with switching tube Q2.Wherein when drive pulse signal is changed into high electricity
Usually, switching tube Q1 normallies, electric discharge is realized；Meanwhile electric capacity C1 is charged by resistance R4, if drive pulse signal is held
Continue for high level, when electric capacity C1 both end voltages are more than voltage-stabiliser tube D1 breakdown voltage, switching tube Q2 conductings, switching tube Q1 is closed
It is disconnected, cut off discharge loop.Switching tube Q1, Q2 are triode or MOSFET.
Furthermore it is also possible to electric capacity C1 and resistance R4 position is commutative, while by voltage-stabiliser tube D1 Opposite direction connections, switching tube
Q2 changes conduction type, can also realize the purpose of protection circuit.
Brief description of the drawings
Fig. 1 electric discharge driving circuits of the prior art；
Fig. 2 is according to the charging pile bus discharge Drive Protecting Circuit of the utility model embodiment；
Fig. 3 is according to another charging pile bus discharge Drive Protecting Circuit of the utility model embodiment.
Embodiment
The utility model proposes protection circuit it is as shown in Figure 2.Added between drive signal and relay driving pipe
Triode Q2, voltage-stabiliser tube D1, electric capacity C1 and resistance R2, R3, R4.Resistance R4 one end is connected with drive pulse signal, the other end with
Voltage-stabiliser tube D1 and resistance R3 and switching tube Q2 series connection, resistance R2 one end connection drive pulse signal, other end connection resistance R1
With switching tube Q2 parallel connected end；The resistance R1 other end is connected with switching tube Q1, and switching tube Q1 is connected with relay RELAY,
Relay RELAY both ends bridge diode, and electric capacity C1 one end is connected with voltage-stabiliser tube D1, and the other end is connected with switching tube Q2.
Circuit protection principle is as follows：When drive signal is changed into high level, triode Q1 normallies, realize that bus is put
Electricity.Meanwhile electric capacity C1 is charged by R4, if drive signal is continuously high level, when C1 both end voltages are more than voltage-stabiliser tube D1
Breakdown voltage when, triode Q2 conducting.Now, D points are pulled to low level, Q1 shut-offs, cut off discharge loop.This protection circuit
Mainly by the charging interval to electric capacity C1, to control the pulsewidth of drive signal.When drive signal fails (permanent High level)
The excision of discharge loop can be realized by hardware circuit.
Assuming that drive signal high level voltage is Vcc, driving current I, triode saturation conduction pressure drop is Vce protection electricity
The design of road device parameters is as follows：
R2 is current-limiting resistance when realizing protection, and resistance requirement is:Power requirement is：R4 and
C1 forms timing constant, τ, after setting elapsed time τ, protection circuit action, according to electric capacity charge formula
In order that triode Q2 can just be turned at this moment, voltage-regulator diode of the breakdown voltage for Vr=Vt-0.7 should be selected.R4 and
C1 parameter is determined by guard time τ, τ=R4*C1, if R4 selectes a certain value, can calculate C1 size.R3 and Q2 choosing
Type refers to R1 and Q1.The switching tube Q2 of protection can be triode or MOSFET.
The form of protection circuit can be deformed as follows, as shown in figure 3, electric capacity C1 and resistance R4 position can be handed over
Change, while voltage-stabiliser tube D1 Opposite direction connections, switching tube Q2 are changed into conduction type, can also realize the purpose of protection circuit.
Above-mentioned embodiment be only it is exemplary the utility model is shown, be not intended to limit the utility model.It is right in addition
Belong to technology contents well known to those skilled in the art in be not described in the step of.Conceive for covering in the utility model
Interior corresponding conversion and change are in the scope of the utility model.
Claims (6)
1. a kind of direct-current charging post bus bleed-off circuit protection circuit, including：
Relay RELAY, switching tube Q1, Q2, resistance R1, R2, R3, R4, and electric capacity C1 and voltage-stabiliser tube D1, wherein：
Resistance R4 one end is connected with drive pulse signal, and the other end is connected with voltage-stabiliser tube D1 and resistance R3 and switching tube Q2,
Resistance R2 one end connects drive pulse signal, and the other end connects resistance R1 and switching tube Q2 parallel connected end；
The resistance R1 other end is connected with switching tube Q1, and switching tube Q1 is connected with relay RELAY,
Diode is bridged at relay RELAY both ends,
Electric capacity C1 one end is connected with voltage-stabiliser tube D1, and the other end is connected with switching tube Q2.
2. direct-current charging post bus bleed-off circuit protection circuit according to claim 1, it is characterised in that work as driving pulse
When signal is changed into high level, switching tube Q1 normallies, electric discharge is realized；Meanwhile electric capacity C1 is charged by resistance R4, if driving
Moving pulse signal is continuously high level, when electric capacity C1 both end voltages are more than voltage-stabiliser tube D1 breakdown voltage, switching tube Q2 conductings,
Switching tube Q1 is turned off, and cuts off discharge loop.
3. direct-current charging post bus bleed-off circuit protection circuit according to claim 1, it is characterised in that switching tube Q1,
Q2 is triode or MOSFET.
4. direct-current charging post bus bleed-off circuit protection circuit according to claim 3, it is characterised in that electric capacity C1 and electricity
It is commutative to hinder R4 position, while voltage-stabiliser tube D1 Opposite direction connections, switching tube Q2 are changed into conduction type.
5. direct-current charging post bus bleed-off circuit protection circuit according to claim 3, it is characterised in that assuming that driving letter
Number high level voltage is Vcc, and driving current I, the pressure drop of triode saturation conduction is Vce, and R2 is current limliting electricity when realizing protection
Resistance, resistance requirement are:Power requirement is：。
6. direct-current charging post bus bleed-off circuit protection circuit according to claim 5, it is characterised in that R4 and C1 compositions
Timing constant, τ, after setting elapsed time τ, protection circuit action, τ=R4*C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720172004.7U CN206727645U (en) | 2017-02-24 | 2017-02-24 | A kind of direct-current charging post bus bleed-off circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720172004.7U CN206727645U (en) | 2017-02-24 | 2017-02-24 | A kind of direct-current charging post bus bleed-off circuit protection circuit |
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| Publication Number | Publication Date |
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| CN206727645U true CN206727645U (en) | 2017-12-08 |
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| CN201720172004.7U Active CN206727645U (en) | 2017-02-24 | 2017-02-24 | A kind of direct-current charging post bus bleed-off circuit protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767952A (en) * | 2018-06-04 | 2018-11-06 | 南京能瑞电力科技有限公司 | A kind of off-board charging system to interconnect |
-
2017
- 2017-02-24 CN CN201720172004.7U patent/CN206727645U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767952A (en) * | 2018-06-04 | 2018-11-06 | 南京能瑞电力科技有限公司 | A kind of off-board charging system to interconnect |
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