CN107045779A - Control of Electric Vehicles pilot detection circuit with isolation features - Google Patents
Control of Electric Vehicles pilot detection circuit with isolation features Download PDFInfo
- Publication number
- CN107045779A CN107045779A CN201710098771.2A CN201710098771A CN107045779A CN 107045779 A CN107045779 A CN 107045779A CN 201710098771 A CN201710098771 A CN 201710098771A CN 107045779 A CN107045779 A CN 107045779A
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- resistance
- amplifier
- electric capacity
- connection
- diode
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/36—Electric signal transmission systems using optical means to covert the input signal
Abstract
The invention provides a kind of Control of Electric Vehicles pilot detection circuit with isolation features, including peak-detector circuit and isolation circuit；Wherein, the peak-detector circuit includes diode D1, diode D2, resistance R1, resistance R6, electric capacity C3 and amplifier U1A；The isolation circuit includes resistance R4, resistance R5, resistance R3, resistance R7, electric capacity C1, electric capacity C2, electric capacity C4, amplifier U1B, amplifier U3A and linear optical coupling U2.The present invention isolates under conditions of without using complicated isolation circuit to control guidance circuit so that MCU can correctly detect that handshake can effectively isolate with control guidance circuit again simultaneously, insulation request be met, while simple in structure and low in cost.
Description
Technical field
The present invention relates to charging electric vehicle facility, in particular it relates to a kind of Control of Electric Vehicles with isolation features
Pilot detection circuit.
Background technology
The control guidance circuit of electric automobile charging pile is used to produce the handshake between charging pile and electric automobile, electricity
Electrical automobile is by recognizing that this handshake decides whether charging and with the charging of great electric current, and charging pile is by recognizing that this shakes hands
Whether signal deciding gives charging electric vehicle.
When charging pile is connected with electric automobile, the control guidance circuit for producing handshake is easier to be done by the external world
Disturb, if handshake is directly inputted into MCU processing without isolation, extraneous interference may influence MCU just
Often work, can be isolated using optocoupler, but traditional optical coupling isolator does not have linear isolation features, isolation and amplifier end
The linear change of isolation input can not be followed.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of Control of Electric Vehicles with isolation features
Pilot detection circuit, by introducing linear optical coupling, two amplifiers and a small amount of resistance capacitance, realizes isolation and amplifier end and follows
The function of the linear change of isolation input, meets insulation request, while simple in structure and low in cost.
The Control of Electric Vehicles pilot detection circuit with isolation features provided according to the present invention, including peak value inspection
Wave circuit and isolation circuit；
Wherein, the peak-detector circuit includes diode D1, diode D2, resistance R1, resistance R6, electric capacity C3 and amplifier
U1A；Diode D1 negative pole connection resistance R1 one end, the resistance R1 other end, resistance R6 one end connection amplifier U1A are just
Phase input, resistance R6 other end ground connection；
Amplifier U1A output end connection diode D2 positive pole, diode D2 negative pole connection amplifier U1A inverting input,
Resistance R4 one end, electric capacity C3 one end, electric capacity C3 other end ground connection；
The isolation circuit include resistance R4, resistance R5, resistance R3, resistance R7, electric capacity C1, electric capacity C2, electric capacity C4, amplifier U1B,
Amplifier U3A and linear optical coupling U2；
Photodiode in amplifier U1B inverting input connection resistance R4 one end, electric capacity C1 one end, linear optical coupling U2
PD4 negative pole；Amplifier U1B normal phase input end, photodiode PD4 plus earth；Amplifier U1B output end connection electric capacity
C1 one end, resistance R5 one end；LED negative pole in resistance R5 other end connection linear optical coupling U2, LED positive pole connection electricity
Source；Amplifier U3A inverting input connection photodiode PD2 negative pole, electric capacity C2 one end, resistance R3 one end；Electricity
Hold one end connection amplifier U3A of the C2 other end, the resistance R3 other end, resistance R7 output end, amplifier U3A positive input
End, photodiode PD2 plus earth；
The electric capacity C4 one end connection resistance R7 other end, other end ground connection.
Preferably, the linear optical coupling U2 uses model HCNR201 optocoupler.
Preferably, in addition to power module；The power end connects the power module.
Preferably, the just extremely input of the diode D1, the resistance R7 other end is output end；
The peak-detector circuit, the high value for detecting control steering signal CP_IN square waves；Isolation circuit, for inciting somebody to action
The level signal CP_OUT accesses MCU of reflection CP_IN square waves simultaneously isolates control leader circuit with MCU partial circuits
Open.
Compared with prior art, the present invention has following beneficial effect：
The present invention isolates under conditions of without using complicated isolation circuit to control guidance circuit so that MCU can be correct
Detection handshake simultaneously again can with control guidance circuit effectively be isolated, meet insulation request, cost simple in construction
It is cheap.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the block diagram of the Control of Electric Vehicles pilot detection circuit with isolation features in the present invention.
Fig. 2 is the specific circuit diagram of the Control of Electric Vehicles pilot detection circuit with isolation features in the present invention.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
In the present embodiment, the Control of Electric Vehicles pilot detection circuit with isolation features that the present invention is provided,
Including peak-detector circuit and isolation circuit；
Wherein, the peak-detector circuit includes diode D1, diode D2, resistance R1, resistance R6, electric capacity C3 and amplifier
U1A；Diode D1 negative pole connection resistance R1 one end, the resistance R1 other end, resistance R6 one end connection amplifier U1A are just
Phase input, resistance R6 other end ground connection；
Amplifier U1A output end connection diode D2 positive pole, diode D2 negative pole connection amplifier U1A inverting input,
Resistance R4 one end, electric capacity C3 one end, electric capacity C3 other end ground connection；
The isolation circuit include resistance R4, resistance R5, resistance R3, resistance R7, electric capacity C1, electric capacity C2, electric capacity C4, amplifier U1B,
Amplifier U3A and linear optical coupling U2；
Photodiode in the amplifier U1B inverting input connection resistance R4 other end, electric capacity C1 one end, linear optical coupling U2
PD4 negative pole；Amplifier U1B normal phase input end, photodiode PD4 plus earth；Amplifier U1B output end connection electric capacity
C1 one end, resistance R5 one end；LED negative pole in resistance R5 other end connection linear optical coupling U2, LED positive pole connection electricity
Source；Amplifier U3A inverting input connection photodiode PD2 negative pole, electric capacity C2 one end, resistance R3 one end；Electricity
Hold one end connection amplifier U3A of the C2 other end, the resistance R3 other end, resistance R7 output end, amplifier U3A positive input
End, photodiode PD2 plus earth；
The electric capacity C4 one end connection resistance R7 other end, other end ground connection.
The linear optical coupling U2 uses model HCNR201 optocoupler.
The Control of Electric Vehicles pilot detection circuit with isolation features that the present invention is provided, in addition to power supply mould
Block；The power end connects the power module.
The just extremely input of the diode D1, the resistance R7 other end is output end；The peak-detector circuit, is used
In the high value of detection control steering signal CP_IN square waves；Isolation circuit, for the level signal by CP_IN square waves are reflected
CP_OUT accesses MCU simultaneously keeps apart control leader circuit with MCU partial circuits.
In peak-detector circuit, it is positive and negative 12 volts of square-wave signals that frequency is 1KHZ, peak value to control steering signal CP_IN
The function of detecting circuit is the size for the high level for detecting square-wave signal, square-wave signal is converted into DC level signal, this is straight
The value for flowing level signal is equal to the size of square-wave signal high level.
CP_IN signals are changed into high level after diode D1, resistance R1, resistance R6 and reduce four times, low level vanishing
The square wave of volt, amplifier U1A, diode D2, electric capacity C3, the high value of electric circuit inspection this square wave of electric capacity R4 compositions, specific work
It is as mode：When amplifier U1A positive input voltage rise, amplifier U1A output can increase and then force amplifier U1A
Reverse input end follows positive input to increase, and this amplifier U1A reverse input end is that the output end of this circuit is also follow-up
The input of circuit, when amplifier U1A reverse input end voltage declines, amplifier U1A output can be minimized value, but by
In amplifier U1A output terminating diode D2 anode, so diode D2 is not turned on, it will not force amplifier U1A's reverse
Input follows positive input to change, and the voltage of reverse input end only can slowly be dropped by resistance R4, electric capacity C3 discharge process
It is low, but be due to that resistance R4, electric capacity C3 when constant are far longer than 1mS, therefore between the low period of square wave, amplifier U1A's
Reverse input end voltage is basically unchanged, and realizes the function that square-wave signal is converted into DC level signal, and direct current level values
Equal to square wave high value.
In isolation circuit, resistance R4, electric capacity C1, amplifier U1B, resistance R5, LED and photodiode PD1 composition isolation
Input；Photodiode PD2, resistance R3, electric capacity C2, amplifier U3A, resistance R7, electric capacity C4 composition isolation and amplifiers end.
Linear optical coupling U2 separation principle does not have difference with common optical coupler, and the single-shot list of common optical coupler simply is received into pattern slightly
Plus change, the optical receiving circuit that increase by one is used to feed back is used to feed back, so, although two optical receiving circuits are all non-linear
, but the non-linear of two optical receiving circuits be just as, so can just pass through the non-linear straight to offset of feedback network
Logical circulation road it is non-linear, so as to reach the purpose for realizing linear isolation.
In linear optical coupling U2, flow through LED, photodiode PD1, photodiode PD2 electric current and be denoted as I respectivelyLED,
IPD1, IPD2, IPD1And IPD2Substantially and ILEDLinear, linear coefficient is designated as K1 and K2 respectively, i.e.,：
The general very littles of K1 and K2, and vary with temperature larger, but the design of chip make it that K1 and K2 are equal.It can see below
Arrive, in the design of peripheral circuit, real influence output input ratio is the ratio K 3 of the two, and linear optical coupling exactly utilizes this
Plant characteristic and can be only achieved the satisfied linearity.
If the input voltage of this module is Vin, amplifier U1B reverse input end voltage is Vi, amplifier U1B output end electricity
Press as Vo, the relation of plane under the two satisfaction in the case of the unsaturated normal work of amplifier：
Vo=Vo0-G·Vi (1)
Wherein Vo0It is the output voltage when amplifier differential mode is 0, G is amplifier U1B gain, typically very big.
Ignore the input current of amplifier input, it is believed that the electric current by R4 is IPD1, obtained according to Ohm's law：
Electric current by R5 two ends is ILED, obtained according to Ohm's law：
Wherein VLEDFor cathode voltage emitting led in optocoupler, it is contemplated that voltage when LED is turned on is basically unchanged, here as often
Number is treated, and is had according to the characteristic of optocoupler：
Aforementioned four expression formula, which is integrated, to be obtained：
It is very big in view of G, it can do with lower aprons：
The relation for so obtaining isolation and amplifier terminal voltage and isolation input terminal voltage is：
It can be seen that in foregoing circuit, output and input are directly proportional, and proportionality coefficient, only by K3 and R4, R3 is determined, typically selects R4
=R3, reaches the purpose for only isolating and not amplifying.
In actual circuit, in model HCNR201 photo-couplers, K3 error is ± 5%, resistance R4, resistance R3
Precision be 1%, electric capacity C1, resistance C2 be used for filter out High-frequency Interference, R7, C4 is also used for filtering out High-frequency Interference, after tested, circuit
Control steering signal can be more accurately detected, and MCU partial circuits can be effectively isolated with control guidance circuit, it is completely full
Sufficient charging pile real requirement.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (4)
1. a kind of Control of Electric Vehicles pilot detection circuit with isolation features, it is characterised in that including peak detection
Circuit and isolation circuit；
Wherein, the peak-detector circuit includes diode D1, diode D2, resistance R1, resistance R6, electric capacity C3 and amplifier
U1A；Diode D1 negative pole connection resistance R1 one end, the resistance R1 other end, resistance R6 one end connection amplifier U1A are just
Phase input, resistance R6 other end ground connection；
Amplifier U1A output end connection diode D2 positive pole, diode D2 negative pole connection amplifier U1A inverting input,
Resistance R4 one end, electric capacity C3 one end, electric capacity C3 other end ground connection；
The isolation circuit include resistance R4, resistance R5, resistance R3, resistance R7, electric capacity C1, electric capacity C2, electric capacity C4, amplifier U1B,
Amplifier U3A and linear optical coupling U2；
Photodiode in the amplifier U1B inverting input connection resistance R4 other end, electric capacity C1 one end, linear optical coupling U2
PD4 negative pole；Amplifier U1B normal phase input end, photodiode PD4 plus earth；Amplifier U1B output end connection electric capacity
C1 one end, resistance R5 one end；LED negative pole in resistance R5 other end connection linear optical coupling U2, LED positive pole connection electricity
Source；Amplifier U3A inverting input connection photodiode PD2 negative pole, electric capacity C2 one end, resistance R3 one end；Electricity
Hold one end connection amplifier U3A of the C2 other end, the resistance R3 other end, resistance R7 output end, amplifier U3A positive input
End, photodiode PD2 plus earth；
The electric capacity C4 one end connection resistance R7 other end, other end ground connection.
2. the Control of Electric Vehicles pilot detection circuit according to claim 1 with isolation features, its feature exists
In the linear optical coupling U2 uses model HCNR201 optocoupler.
3. the Control of Electric Vehicles pilot detection circuit according to claim 1 with isolation features, its feature exists
In, in addition to power module；The power end connects the power module.
4. the Control of Electric Vehicles pilot detection circuit according to claim 1 with isolation features, its feature exists
In, the diode D1 just extremely input, the resistance R7 other end is output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098771.2A CN107045779A (en) | 2017-02-23 | 2017-02-23 | Control of Electric Vehicles pilot detection circuit with isolation features |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710098771.2A CN107045779A (en) | 2017-02-23 | 2017-02-23 | Control of Electric Vehicles pilot detection circuit with isolation features |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107045779A true CN107045779A (en) | 2017-08-15 |
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ID=59544028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710098771.2A Pending CN107045779A (en) | 2017-02-23 | 2017-02-23 | Control of Electric Vehicles pilot detection circuit with isolation features |
Country Status (1)
| Country | Link |
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| CN (1) | CN107045779A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111250829A (en) * | 2020-03-23 | 2020-06-09 | 广东福维德焊接股份有限公司 | Digital control circuit of underwater constant-power external characteristic welding power supply |
| CN113037276A (en) * | 2021-03-02 | 2021-06-25 | 浙江禾川科技股份有限公司 | Modulation output circuit |
-
2017
- 2017-02-23 CN CN201710098771.2A patent/CN107045779A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111250829A (en) * | 2020-03-23 | 2020-06-09 | 广东福维德焊接股份有限公司 | Digital control circuit of underwater constant-power external characteristic welding power supply |
| CN113037276A (en) * | 2021-03-02 | 2021-06-25 | 浙江禾川科技股份有限公司 | Modulation output circuit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170815 |
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| WD01 | Invention patent application deemed withdrawn after publication |