CN104655959B - Under electric car after electricity high-voltage residual-electricity detection device - Google Patents

Under electric car after electricity high-voltage residual-electricity detection device Download PDF

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CN104655959B
CN104655959B CN201510048158.0A CN201510048158A CN104655959B CN 104655959 B CN104655959 B CN 104655959B CN 201510048158 A CN201510048158 A CN 201510048158A CN 104655959 B CN104655959 B CN 104655959B
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voltage
circuit
electricity
detection
output
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CN104655959A (en
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高新杰
李兴华
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Beijing Electric Vehicle Co Ltd
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Beijing Electric Vehicle Co Ltd
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Abstract

The embodiment of the invention provides the detection devices of high-voltage residual-electricity after electricity under a kind of electric car.The device is arranged in the high voltage control box of electric car, the detection device includes: high-voltage acquisition circuit, voltage comparator circuit and the display circuit being sequentially connected in series, the voltage comparator circuit is also electrically connected with reference voltage circuit, and the voltage comparator circuit is also electrically connected with reference voltage circuit.The detection device of the embodiment of the present invention passes through the actual voltage value for not acquiring the power voltage of electric car, but the voltage value of acquisition is compared with reference voltage, can detecte under power accumulator after electricity vehicle high-pressure system with the presence or absence of remaining electricity.The detection device does not use AD sample circuit design scheme, does not use microprocessor, plays great role for reducing common mode interference influence on dynamic wire harness, avoids CAN network and is disturbed bring and potentially shows risk of errors.

Description

Under electric car after electricity high-voltage residual-electricity detection device
Technical field
The present invention relates to the detection dresses of high-voltage residual-electricity after electricity under electric vehicle engineering field more particularly to a kind of electric car It sets.
Background technique
For pure electric automobile using power accumulator and driving motor as power device, operating voltage is up to hundreds of volts, much super Human safety voltage 36V is crossed, all there may be personnel's electric shocks for aging circuit or damage in insulation etc..Therefore, to electric car It is a very the key link that the power electric pressure of power accumulator, which carries out detection,.
At present, the detection method of the power voltage of the power accumulator of a kind of electric car in the prior art are as follows: dynamic The test point of the power voltage of the power accumulator of setting electric car in power battery packet, by AD sample circuit in above-mentioned inspection Measuring point collection voltages send the power voltage value of the power accumulator of acquisition to microprocessor processes, and pass through CAN (Controller Area Network, controller LAN) network is sent to instrument and shows.
The shortcomings that detection method of the power voltage of the power accumulator of above-mentioned electric car in the prior art are as follows: this Mode is at high cost, and test device volume is big, and shows and be located on instrument board, when maintenance personal is to the certain high pressures of electric car zero When part repair and maintenance, need using whether there is also high pressures on multimeter measurement high voltage bus.It is checked when being overhauled to maintenance personal It makes troubles.The numerical value of current vehicle high voltage can be read from instrument board when vehicle high pressure is powered on, but works as vehicle high pressure When lower electricity, instrument board does not work, can not judge whether high voltage component also has remaining electricity.
Summary of the invention
The embodiment provides the detection devices of high-voltage residual-electricity after electricity under a kind of electric car, to realize to electronic High-voltage residual-electricity is effectively detected after electricity under automobile.
Under a kind of electric car after electricity high-voltage residual-electricity detection device, be arranged in the high voltage control box of electric car, institute Stating detection device includes: high-voltage acquisition circuit, voltage comparator circuit and the display circuit being sequentially connected in series, and the voltage compares Circuit is also electrically connected with reference voltage circuit;
The high-voltage acquisition circuit, the high-voltage line in high voltage control box for acquiring electric car by divider resistance Beam voltage carries out operation amplifier processing to the high-voltage wiring harness voltage that the resistor voltage divider circuit transmits by operational amplifier circuit, Detection voltage is obtained, gives the detection voltage transmission to the voltage comparator circuit;
The voltage comparator circuit, for including electro-detection voltage comparator under vehicle, when the electric car is in When vehicle power-down state, under the vehicle electro-detection voltage comparator receive reference voltage circuit output reference voltage and The output level of electro-detection voltage comparator under the vehicle is transferred to the display circuit by the detection voltage;
The display circuit, for including electro-detection display under vehicle, when the electric car is under vehicle electric When state, electro-detection display receives the output level of electro-detection voltage comparator under the vehicle in the high pressure, according to institute It states output level and shows that the vehicle power-down state of the electric car is normal or abnormal.
Preferably, described device includes: cathode voltage collection point and cathode voltage collection point, the cathode voltage collection point By the anode connection of the high-voltage positive electrode bus and power accumulator of high voltage control box, the cathode voltage collection point passes through high pressure The cathode positive electrode bus of control box is connected with the cathode of power accumulator.
Preferably, described device further include:
Input protection circuit, for including two anti-reverse diode D2 and D3, two high pressure self- recoverages insurance Fu2 and Fu3, the voltage v of the cathode voltage collection point acquisitionHV+The anode tap of the anti-reverse diode D2 is connected, it is described anti-reverse The cathode terminal of diode D2 is connected to high pressure self- recoverage insurance Fu2, and high pressure self- recoverage insurance Fu2 is also connected to electric resistance partial pressure electricity Road, the voltage v of the cathode voltage collection point acquisitionHV-Connect the cathode terminal of the anti-reverse diode D3, described anti-reverse two The anode tap of pole pipe D3 is connected to high pressure self- recoverage insurance Fu3, and high pressure self- recoverage insurance Fu3 is also connected to resistor voltage divider circuit.
Preferably, the reference voltage circuit includes: low-voltage power supply circuit and the low-tension supply conversion of mutual circuit connection Circuit, the low-tension supply conversion circuit includes the input filter circuit being sequentially connected in series, isolated supplies conversion chip, defeated Filter circuit and DC power supply conversion chip out, the input filter circuit receive the 12V electricity of the low-voltage power supply circuit output Signal is pressed, the isolated supplies conversion chip, the isolated form are transferred to after being filtered to the 12V voltage signal Power conversion chip generates the 5V voltage signal of isolation according to the 12V voltage signal, and the 5V voltage signal is transferred to institute DC power supply conversion chip is stated, the 5V voltage signal is converted to 4.5V reference voltage by the DC power supply conversion chip to be believed Number.
Preferably, using the cathode of the output end of the isolated supplies conversion chip as the floating ground of the detection device GND。
Preferably, the low-voltage power supply circuit includes: low pressure 12V power supply circuit, 12V power switching circuit, and low pressure 12V is supplied Circuit includes: that the starting ignition circuit being connected in parallel, often electric power supply circuit and charging wake-up circuit, starting ignition circuit include Starting ignition switch, the anti-reverse diode D2 of series connection, charging wake-up circuit include that the charging being connected in series wakes up igniting Switch, anti-reverse diode D1, often electricity power supply circuit includes the normal electric firing lock being sequentially connected in series, insurance Fu1;
The 12V power switching circuit includes SW1 relay and SW2 relay.
Preferably, the high-voltage acquisition circuit includes: resistance Rn, resistance Rp, resistance R4, resistance R5, calculus of differences amplification Device U3,
One end connection floating ground GND, the other end of the resistance R4 connect the positive input pole of differential operational amplifier U3, electricity The output end of one end connection high input voltage protection circuit of Rp, the positive input pole of other end connection differential operational amplifier U3 are hindered, Output end, the other end of one end connection high input voltage protection circuit of resistance Rn connect the negative input of differential operational amplifier U3 Pole, the negative input pole of one end connection differential operational amplifier U3 of resistance R5, the other end connect the defeated of differential operational amplifier U3 Outlet.
Preferably, if R5 is the resistance value of resistance R5, Rp is the resistance value of resistance Rp, and R4 is the resistance value of resistance R4, and Rn is resistance The resistance value of Rn, described R5, Rp, R4 and Rn are according to the output minimum voltage and the benchmark of the power accumulator of the electric car Potential circuit output reference voltage and determine;
The output voltage of the differential operational amplifier U3 is vOUT:
Preferably, the negative input of electro-detection voltage comparator connects the differential operational amplifier under the vehicle Output end, electrode input end connect the output end of the reference voltage circuit,
When the output voltage Vout of the differential operational amplifier is greater than the reference voltage of reference voltage circuit output When, electro-detection voltage comparator exports low level under vehicle;When the output voltage Vout of the differential operational amplifier is less than institute When stating the reference voltage of reference voltage circuit output, electro-detection voltage comparator exports high level under vehicle.
Preferably, electro-detection display is Light-emitting diode LED 3 under the vehicle, and the Light-emitting diode LED 3 is just Pole connect with the output end of electro-detection voltage comparator U4 under the vehicle by circuit, the cathode of Light-emitting diode LED 3 and is floated The GND connection of dynamic ground, when electro-detection voltage comparator exports low level under vehicle, LED3 is not lighted, and indicates the electric car Vehicle under be still within unsafe discharge condition after electricity;When electro-detection voltage comparator exports high level under vehicle, LED3 is lighted, and indicates the discharge condition under the vehicle of the electric car in safety after electricity.
As can be seen from the technical scheme provided by the above-mentioned embodiment of the present invention, the detection device of the embodiment of the present invention passes through The actual voltage value of the power voltage of electric car is not acquired, but the voltage value of acquisition is compared with reference voltage, it can Not only to detect the vehicle power-up state of electric car, but also it can detecte under power accumulator that vehicle high-pressure system whether there is after electricity Remaining electricity.The detection device does not use AD sample circuit design scheme, does not use microprocessor, for reducing common mode on dynamic wire harness Interference effect plays great role, avoids CAN network and is disturbed bring and potentially shows risk of errors.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description Obviously, or practice through the invention is recognized.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other Attached drawing.
Fig. 1 is the detection device of high-voltage residual-electricity after electricity under the electric car that the embodiment of the present invention one provides in high voltage control box Interior electrical connection schematic diagram;
Fig. 2 is the internal structure of the detection device of high-voltage residual-electricity after electricity under a kind of electric car provided in an embodiment of the present invention Block diagram
Fig. 3 is a kind of structural block diagram of reference voltage circuit provided in an embodiment of the present invention;
Fig. 4 is the physical circuit of a kind of low pressure 12V power supply circuit provided in an embodiment of the present invention, 12V power switching circuit Figure;
Fig. 5 is a kind of circuit connection diagram of low-tension supply conversion circuit provided in an embodiment of the present invention;
Fig. 6 is input protection circuit in a kind of detection device shown in Fig. 2 provided in an embodiment of the present invention, high-voltage acquisition The circuit connection diagram of circuit, voltage comparator circuit, reference voltage bleeder circuit, display circuit;
Fig. 7 is that the testing process of the detection device of high-voltage residual-electricity after electricity under electric car provided by Embodiment 2 of the present invention shows It is intended to;
Fig. 8 is the operation provided by Embodiment 2 of the present invention outside high voltage control box and display panel schematic diagram.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or coupling.Wording used herein "and/or" includes one or more associated any cells for listing item and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.
In order to facilitate understanding of embodiments of the present invention, it is done by taking several specific embodiments as an example below in conjunction with attached drawing further Explanation, and each embodiment does not constitute the restriction to the embodiment of the present invention.
Embodiment one
In practical applications, for user or service personnel, care is more whether power accumulator is normal high Pressure powers on, and whether electricity of whether also having a surplus after electricity under vehicle, remaining electricity has more than the high-voltage electricity of human safety voltage 36V.
The embodiment of the present invention acquires the power voltage of electric car using divider resistance method, and judges the voltage of power voltage Range, and measured without the specific value of power electric pressure.Under the electric car of the embodiment of the present invention after electricity high-voltage residual-electricity inspection Surveying device can judge that high-pressure system whether there is greater than human safety voltage's under the power accumulator of electric car when electricity Remaining electricity (mainly electricity existing for the capacitor at each high voltage parts high voltage direct current input end).
The power distribution unit that high voltage control box is connected as power accumulator with high voltage parts, the embodiment of the present invention mention The detection device of confession is installed in the high voltage control box of electric car, and electrical connection of the detection device in high voltage control box is closed It is schematic diagram as shown in Figure 1, the present apparatus is installed in high voltage control box, the high pressure test point of detection device is selected in high voltage control On high pressure positive and negative anodes bus in box, comprising: cathode voltage collection point A (HV+) and cathode voltage collection point B (HV-), it is described just Anode connection of the pole tension collection point HV+ by the high-voltage positive electrode bus and power accumulator of high voltage control box, the negative electricity Pressure collection point HV- is connected by the cathode positive electrode bus of high voltage control box with the cathode of power accumulator.
Under a kind of electric car provided in an embodiment of the present invention after electricity the detection device of high-voltage residual-electricity internal structure block diagram As shown in Fig. 2, including high input voltage protection circuit, high-voltage acquisition circuit, voltage comparator circuit, reference voltage circuit and display electricity Road, wherein high input voltage protection circuit, high-voltage acquisition circuit, voltage comparator circuit and display circuit are sequentially connected in series, voltage Comparison circuit is also electrically connected with reference voltage circuit, receives the reference voltage of reference voltage circuit output.As shown in Figure 2, it examines It surveys device and acquires the high voltage in Fig. 1 between A point and B point, the high voltage is by high input voltage protection circuit and high-voltage acquisition After circuit, amplifier output and reference voltage bleeder circuit export the input respectively as voltage comparator circuit, and display circuit is shown Voltage comparator exports result.
The high-voltage acquisition circuit, the high-voltage line in high voltage control box for acquiring electric car by divider resistance Beam voltage (high voltage in Fig. 1 between A point and B point) carries out operation amplifier to the high-voltage wiring harness voltage by operational amplifier circuit Processing, obtains detection voltage, gives the detection voltage transmission to the voltage comparator circuit;
The voltage comparator circuit receives the reference voltage electricity for including electro-detection voltage comparator under vehicle The reference voltage of road output, when the electric car is in vehicle power-down state, electro-detection voltage comparator under the vehicle The reference voltage and the detection voltage are received, the output level of electro-detection voltage comparator under the vehicle is transferred to institute State display circuit;
The display circuit, for including electro-detection display under vehicle, when the electric car is under vehicle electric When state, electro-detection display receives the output level of electro-detection voltage comparator under the vehicle in the high pressure, according to institute It states output level and shows that the vehicle power-down state of the electric car is normal or abnormal.
The structure and function of the modules in above-mentioned detection device is described in detail below.
A kind of structural block diagram of reference voltage circuit provided in an embodiment of the present invention is as shown in figure 3, include that low pressure 12V powers Circuit, 12V power switching circuit and low-tension supply conversion circuit, wherein low pressure 12V power supply circuit, 12V power switching circuit Physical circuit figure it is as shown in Figure 4.
As shown in Figure 4, low pressure 12V power supply circuit includes: the starting ignition circuit being connected in parallel, normal electric power supply circuit and fills Electric wake-up circuit.Starting ignition circuit is ON electricity (the 12V power supply obtained after ignition switch starting), the starting including series connection Ignition switch, anti-reverse diode D2.Charging wake-up circuit is the 12V electricity obtained when Vehicular charger charges to power accumulator Source, the charging including series connection wake up ignition switch, anti-reverse diode D1.Often electricity power supply circuit is directly by 12V electric power storage Pond power supply, including normal electric firing lock, the insurance Fu1 being sequentially connected in series.
12V power switching circuit is mainly made of SW1 relay and SW2 relay, and SW2 is normally closed light coupling relay, whole When vehicle powers on (ON electricity) or Vehicular charger charging, LEDs ON in SW2, SW2 load outputs are disconnected.Charging wakes up 12V and ON electricity 12V is separately connected parallel connection after anti-reverse diode D1 and D2, then concatenates current-limiting resistance R1, inputs and controls as SW2 System.Often electricity is connected to manual key SW1, SW1 connects SW2 load input terminal after pressing, when SW2 is led after insuring Fu1 to 12V After logical, the normal electricity of 12V can be exported through SW2, be denoted as+12V.LED1 is 12V often electric indicator light, and after SW1 is pressed, 12V is often electric through limiting LED1 is lighted after leakage resistance R2.
A kind of circuit connection diagram of low-tension supply conversion circuit provided in an embodiment of the present invention is as shown in figure 5, include Input filter (input filter) circuit, isolated supplies conversion chip, the output filter being sequentially connected in series are (defeated Filter out) circuit and DC power supply conversion chip and indicating circuit.The input filter circuit receives the low-voltage power supply electricity The 12V voltage signal of road output is transferred to the isolated supplies conversion core after being filtered to the 12V voltage signal Piece, the isolated supplies conversion chip generates the 5V voltage signal of isolation according to the 12V voltage signal, by the 5V voltage Signal is transferred to the DC power supply conversion chip, and the 5V voltage signal is converted to 4.5V by the DC power supply conversion chip Reference voltage signal.
As shown in figure 5, U1 is that isolated supplies convert chip (DC/DC) ,+12V electricity of above-mentioned low-voltage power supply circuit output Pressure gives U1 after input filter circuit, and U1 generates the VCC (+5V) of isolation, and the VCC (+5V) is after output filter circuit It exports to above-mentioned detection device, powers for detection device low-voltage circuit.DC power supply conversion chip U2 is converted to VCC (+5V)+ 4.5V reference voltage source simultaneously exports.
Due to electric powered motor battery management system (BMS) all have Insulation monitoring function, testing principle be It is connected to detection resistance between high pressure positive and negative anodes and car body, that is, car body minus earth point (shown in Fig. 5) is selected to refer to as detection Point, if mesohigh of embodiment of the present invention detection circuit results in high pressure positive and negative so still using car body minus earth point as reference point Detection resistance between pole and car body minus earth point when existing Insulation monitoring, and the divider resistance of dynamic voltage acquisition, electricity Resistance is in parallel so as to cause Insulation monitoring failure, so high pressure detection cannot select car body cathode with reference to ground.The embodiment of the present invention is adopted Cathode GND (shown in Fig. 5) with the output end of isolated supplies conversion chip U2 is that high pressure detects reference point, this can regard one as A " floating ground ", but this floating ground GND is that locally, ensure that detection function, while in turn ensuring that 12V power input is negative Power cathode GND (floating ground GND) is completely isolated after pole, that is, car body and conversion.U2 can choose high-precision low-drift, low-power consumption LT1790AIS6-2.5 chip.LED3 is VCC status indicator lamp, can be used for judging whether detection device has+12V power supply.
For the quality for guaranteeing vehicle low-voltage electric system 12V power supply, each low voltage equipment must assure that enough electromagnetism Compatibility, its typical switching frequency of power conversion chip used in the embodiment of the present invention are 300kHz, and when work is easy to bring The low-tension supply input filtering circuit of high-frequency electromagnetic interference problem, the embodiment of the present invention plays reduction conduction and radiation-emitting Decisive action, actual test show that the power input conducted emission of the embodiment of the present invention can meet low-tension supply conducted emission The superlative degree of limit value, output filter circuit guarantee the VCC power supply of output " clean ", ensure that amplifier in high-voltage detecting circuit, base The power quality of quasi- power supply and voltage comparator.
Input protection circuit, high-voltage acquisition circuit in a kind of detection device shown in Fig. 2 provided in an embodiment of the present invention, Voltage comparator circuit, reference voltage bleeder circuit, the circuit connection diagram of display circuit are as shown in Figure 6.
Input protection circuit is connected for the cathode voltage collection point with the detection device with cathode voltage collection point, To the voltage v of cathode voltage collection point acquisitionHV+, cathode voltage collection point acquisition voltage vHV-It carries out at protection Reason, will protection treated voltage vHV+, voltage vHV-It is transferred to the resistor voltage divider circuit.The input of high pressure positive and negative anodes uses two Connector ensure that electric clearance, input terminal first pass around input protection circuit, and input protection circuit includes two anti-reverse two Pole pipe D2 and D3, anti-reverse diode reverse withstand voltage are 1000V, and rated current 1A meets design requirement, input protection circuit Further include two high pressure self- recoverage insurance Fu2 and Fu3, plays protective action when high-voltage detecting circuit occurs and is shorted failure, no High-pressure system is influenced to work normally.vHV+D2 anode tap is connected, D2 cathode terminal is connected to Fu2, and Fu2 is connected to Rp in bleeder circuit, vHV-D3 cathode terminal is connected, D3 anode tap is connected to Fu3, and Fu3 is connected to Rn in bleeder circuit.
The high-voltage acquisition circuit includes: resistance Rn, resistance Rp, resistance R4, resistance R5 and differential operational amplifier One end connection floating ground GND, the other end of U3, the resistance R4 connect the positive input pole of differential operational amplifier U3, resistance Rp One end connection high input voltage protection circuit output end, the other end connection differential operational amplifier U3 positive input pole, resistance Output end, the other end of one end connection high input voltage protection circuit of Rn connect the negative input pole of differential operational amplifier U3, electricity Hinder the negative input pole of one end connection differential operational amplifier U3 of R5, the output end of other end connection differential operational amplifier U3.
If R5 is the resistance value of resistance R5, Rp is the resistance value of resistance Rp, and R4 is the resistance value of resistance R4, and Rn is the resistance of resistance Rn Value, to guarantee resistor voltage divider network balance, Rn=Rp, R4=R5, to improve Rn, Rp stress levels, in actual design, Rn and Rp It is composed in series respectively by multiple divider resistances.Described R5, Rp, R4 and Rn are according to the output of the power accumulator of the electric car Minimum voltage and the reference voltage circuit output reference voltage and determine.
The output voltage of the differential operational amplifier U3 is vOUT:
The difference of the output voltage of differential amplifier and two input voltages is directly proportional, the amplification factor of amplifier depend on R5 with Rp, and it is not related with the inner parameter of amplifier.It is the most key, it can be reduced using differential operational amplifier circuit acquisition power voltage Common mode interference bring influences.
If the power voltage of power accumulator is vHV, and high-voltage positive electrode input voltage is set as vHV+, cathode voltage vHV-, can Know vHV=vHV+-vHV-.Since the impedance of the power bus of high voltage control box is very low, it is believed that the high pressure in high voltage control box is female Line voltage is also vHV.U3 is the differential operational amplifier of single supply power supply, constitutes differential operational with surrounding resistance, capacitor and puts Big circuit.
Illustratively, the output minimum voltage of current driving force battery is 240VDC, power accumulator in actual use Minimum output vHVGreater than 250V, for the embodiment of the present invention using 250V as minimum output voltage, the selection of divider resistance is based on following examine Consider, R5 selects 6.2K precision resister, and Rp is composed in series by four 150K resistance respectively, it is known that R4/ (R4+Rp) ≈ 0.01, together When reason can obtain vehicle power-up state, U3 output (VOUT) theoretical minimum value is approximately equal to 0.01*250V=2.5V.Power electric power storage simultaneously Pond exports highest low pressure and is no more than 400V, is output maximum value with 400V, 400*R4/ (R4+Rp)=4V can be obtained, in U3 output quantity Within the scope of journey, similarly guarantee that U3 output is no more than U4 input range.
As shown in fig. 6, electro-detection voltage comparator U4 is voltage comparator under vehicle, if chip cathode (-) pin of U4 When input is higher than positive (+) pin input, U4 exports low level;If chip cathode (-) the pin input of U4 is drawn lower than positive (+) When foot inputs, U4 exports high level.
The negative input of electro-detection voltage comparator U4 under the output end connection vehicle of differential operational amplifier U3.Benchmark Voltage branch circuit :+4.5V the reference voltage that U2 is exported in Fig. 5 is after resistance R6 and R7 partial pressure, and the voltage drop on R7 is as U4 Positive input reference.It is the precision resistance of 1K that R7, which takes resistance value, in this detection device, and it is the precision resistance of 11.5k that R6, which takes resistance value, R7/ (R6+R7)=1/12.5, so the voltage on R7 is reduced to 4.5/12.5=0.36V.When the negative input of U4 is greater than When 0.36V (TV university is in 36V more than corresponding high-pressure system), U4 exports low level, (corresponds to when the negative input of U4 is less than 0.36V Electricity is less than 36V more than high-pressure system) when, U4 exports high level.
U4 output end connects display circuit, and wherein R8 and R9 is pull-up resistor, and one end connects VCC, and it is defeated that the other end connects U4 Out, guarantee that voltage is reliably high level when U4 output high level.Electro-detection display is Light-emitting diode LED 3 under the vehicle, The anode of the Light-emitting diode LED 3 is connected by circuit with the output end of electro-detection voltage comparator U4 under the vehicle, is sent out The cathode of optical diode LED3 is connected with floating ground GND.R10 is the current-limiting resistance of LED3, as the above analysis, when U4 is exported When low level, LED3 is not lighted, and indicates to be still within unsafe discharge condition under the vehicle of above-mentioned electric car after electricity;Work as U4 When exporting high level, LED3 is lighted, and indicates the discharge condition under the vehicle of above-mentioned electric car in safety after electricity.
Embodiment two
One detection device based on the above embodiment, high-voltage residual-electricity after electricity under a kind of electric car which provides The testing process schematic diagram of detection device is as shown in fig. 7, comprises following detection process:
The bus power voltage status of power accumulator can be divided into three states: power-up state (vHV> 250V), discharge condition (36V<vHV< 250V) and safe condition (vHV< 36V):
R6 and R7 is divider resistance, and it is the precision resistance of 1K that R7, which takes resistance value, in this detection device, and it is 11.5k's that R6, which takes resistance value, Precision resistance, R7/ (R6+R7)=1/12.5, so the voltage on R7 is reduced to 4.5/12.5=0.36V.When the cathode of U4 inputs When end is greater than 0.36V (TV university is in 36V more than corresponding high-pressure system), U4 exports low level, when the negative input of U4 is less than 0.36V When (electricity is less than 36V more than corresponding high-pressure system), U4 exports high level.
Detection starts, and by lower switch SW1, determines whether the LED1 in low-voltage power supply circuit is already on, if it is not, Electric car is in high pressure and powers on or charged state.When LED1 is already on, subsequent operation is carried out.
Determine whether the LED2 in low-tension supply conversion circuit is already on, if it is not, illustrating control circuit power supply Failure.When LED2 is already on, subsequent operation is carried out.
Determine whether the LED3 in display circuit is already on, if it is not, illustrating vHV> 36V, U4 export low level When, it indicates to be still within unsafe discharge condition under the vehicle of above-mentioned electric car after electricity;If LED3 is already on, say Bright vHVWhen < 36V, U4 export high level, the discharge condition under the vehicle of above-mentioned electric car in safety after electricity is indicated.
The indicator light of the detection device of the embodiment of the present invention and normal electric switch are installed on high voltage control box cover, are located at high voltage-controlled Operation and display panel schematic diagram outside box processed is as shown in figure 8, convenient for observation and operation.A kind of LED3 that the embodiment provides Light/OFF state and the discharge condition of electric car, the corresponding relationship of safe condition it is as shown in the table:
vHV LED1 LED2 LED3
Discharge condition >36V It lights It lights Extinguish
Safe condition <36V It lights It lights It lights
In conclusion the detection device of the embodiment of the present invention passes through the virtual voltage for not acquiring the power voltage of electric car Value, but the voltage value of acquisition is compared with reference voltage, can detecte under power accumulator vehicle high-pressure system after electricity With the presence or absence of remaining electricity.The detection device does not use AD sample circuit design scheme, does not use microprocessor, is pure analog circuit, It is acquired using differential amplifier data, plays great role for reducing common mode interference influence on dynamic wire harness, it is complete to power on instruction By physical signal lines, avoids CAN network and be disturbed bring and potentially show risk of errors.Differential amplifier output and precision Reference power supply is relatively given voltage comparator and is compared, so that whether accurate judgement power accumulator has gone up high-voltage electricity or whole Vehicle is lower electric safely.
The detection device of the embodiment of the present invention is installed in electric automobile high-voltage control box, and power voltage indicator lamp is from high pressure It controls box top cover to expose, easy access personnel understand power accumulator in time and high pressure ancillary apparatus connected in parallel powers on feelings Condition.
The detection device of the embodiment of the present invention is at low cost, and installation volume is small.In addition can be in real-time display high pressure after the device Electric situation, operator can intuitively understand power accumulator electrifying condition, it is not necessary to be measured, be saved the time using multimeter, and pacified Quan Xinggao, it is easy to repair in this way, maintenance when safety operation.
Isolated supplies conversion circuit in the detection device of the embodiment of the present invention both ensure that foot between high pressure and low pressure Enough electrical isolations, and one is provided with reference to ground for detection total voltage, original Insulation test function is not influenced, and is fully considered Electromagnetic Compatibility Design while meeting function greatly reduces the device along power supply line conducted emission intensity, is guaranteeing Electromagnetic compatibility and safeguard protection design are considered in normal display high pressure while Electricity Functional.
Those of ordinary skill in the art will appreciate that: attached drawing is the schematic diagram of one embodiment, module in attached drawing or Process is not necessarily implemented necessary to the present invention.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can It realizes by means of software and necessary general hardware platform.Based on this understanding, technical solution of the present invention essence On in other words the part that contributes to existing technology can be embodied in the form of software products, the computer software product It can store in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that a computer equipment (can be personal computer, server or the network equipment etc.) executes the certain of each embodiment or embodiment of the invention Method described in part.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device or For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein the conduct The unit of separate part description may or may not be physically separated, component shown as a unit can be or Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill Personnel can understand and implement without creative efforts.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims Subject to.

Claims (8)

1. under a kind of electric car after electricity high-voltage residual-electricity detection device, which is characterized in that be arranged in electric car height it is voltage-controlled In box processed, the detection device includes: high-voltage acquisition circuit, voltage comparator circuit and the display circuit being sequentially connected in series, institute Voltage comparator circuit is stated also to be electrically connected with reference voltage circuit;
The high-voltage acquisition circuit, the high-voltage wiring harness in high voltage control box for acquiring electric car by divider resistance are electric Pressure carries out operation amplifier processing to the high-voltage wiring harness voltage that the divider resistance transmits by operational amplifier circuit, is detected Voltage gives the detection voltage transmission to the voltage comparator circuit;
The voltage comparator circuit, for including electro-detection voltage comparator under vehicle, when the electric car is in vehicle When power-down state, electro-detection voltage comparator receives the reference voltage of reference voltage circuit output and described under the vehicle Voltage is detected, the output level of electro-detection voltage comparator under the vehicle is transferred to the display circuit;
The display circuit, for including electro-detection display under vehicle, when the electric car is in vehicle power-down state When, electro-detection display receives the output level of electro-detection voltage comparator under the vehicle under the vehicle, according to described defeated Level shows that the vehicle power-down state of the electric car is normal or abnormal out;
The reference voltage circuit includes: the low-voltage power supply circuit and low-tension supply conversion circuit of mutual circuit connection, described low Piezoelectricity power-switching circuit includes the input filter circuit being sequentially connected in series, isolated supplies conversion chip, output filter circuit With DC power supply conversion chip, the input filter circuit receives the 12V voltage signal of the low-voltage power supply circuit output, to institute It states and is transferred to the isolated supplies conversion chip after 12V voltage signal is filtered, the isolated supplies convert core Piece generates the 5V voltage signal of isolation according to the 12V voltage signal, and the 5V voltage signal is transferred to the DC power supply The 5V voltage signal is converted to 4.5V reference voltage signal by conversion chip, the DC power supply conversion chip;
The low-voltage power supply circuit includes: low pressure 12V power supply circuit, 12V power switching circuit, and low pressure 12V power supply circuit includes: Starting ignition circuit, often electric power supply circuit and the charging wake-up circuit being connected in parallel, starting ignition circuit includes being connected in series Starting ignition switch, anti-reverse diode D2, charging wake-up circuit include that the charging being connected in series wakes up ignition switch, anti-reverse Diode D1, often electricity power supply circuit includes the normal electric firing lock being sequentially connected in series, insurance Fu1;The 12V power switching electricity Road includes SW1 relay and SW2 relay.
2. under electric car according to claim 1 after electricity high-voltage residual-electricity detection device, which is characterized in that described device It include: cathode voltage collection point and cathode voltage collection point, the cathode voltage collection point passes through the high positive pressure of high voltage control box The anode connection of pole bus and power accumulator, the cathode voltage collection point by the cathode positive electrode bus of high voltage control box and The cathode of power accumulator connects.
3. under electric car according to claim 2 after electricity high-voltage residual-electricity detection device, which is characterized in that described device Further include:
Input protection circuit, for including two anti-reverse diode D2 and D3, two high pressure self- recoverages insurance Fu2 and Fu3, institute State the voltage v of cathode voltage collection point acquisitionHV+Connect the anode tap of the anti-reverse diode D2, the anti-reverse diode The cathode terminal of D2 is connected to high pressure self- recoverage insurance Fu2, and high pressure self- recoverage insurance Fu2 is also connected to resistor voltage divider circuit, described The voltage v of cathode voltage collection point acquisitionHVConnect the cathode terminal of the anti-reverse diode D3, the anti-reverse diode D3 Anode tap be connected to high pressure self- recoverage insurance Fu3, high pressure self- recoverage insurance Fu3 be also connected to resistor voltage divider circuit.
4. under electric car according to claim 1 after electricity high-voltage residual-electricity detection device, which is characterized in that will it is described every Floating ground GND of the cathode of the output end of release power conversion chip as the detection device.
5. under electric car according to claim 4 after electricity high-voltage residual-electricity detection device, which is characterized in that the high pressure Acquisition Circuit includes: resistance Rn, resistance Rp, resistance R4, resistance R5, differential operational amplifier U3,
One end connection floating ground GND, the other end of the resistance R4 connect the positive input pole of differential operational amplifier U3, resistance Rp One end connection high input voltage protection circuit output end, the other end connection differential operational amplifier U3 positive input pole, resistance Output end, the other end of one end connection high input voltage protection circuit of Rn connect the negative input pole of differential operational amplifier U3, electricity Hinder the negative input pole of one end connection differential operational amplifier U3 of R5, the output end of other end connection differential operational amplifier U3.
6. under electric car according to claim 5 after electricity high-voltage residual-electricity detection device, which is characterized in that set R5 as electricity Hinder R5 resistance value, Rp be resistance Rp resistance value, R4 be resistance R4 resistance value, Rn be resistance Rn resistance value, described R5, Rp, R4 and Rn is according to the output minimum voltage of the power accumulator of the electric car and the reference voltage of reference voltage circuit output And it determines;
The output voltage of the differential operational amplifier U3 is Vout:
7. under electric car according to claim 6 after electricity high-voltage residual-electricity detection device, which is characterized in that the vehicle The negative input of lower electro-detection voltage comparator connects the output end of the differential operational amplifier U3, electrode input end connection The output end of the reference voltage circuit,
When the output voltage Vout of the differential operational amplifier U3 is greater than the reference voltage of reference voltage circuit output, Electro-detection voltage comparator exports low level under vehicle;Described in being less than as the output voltage Vout of the differential operational amplifier U3 When the reference voltage of reference voltage circuit output, electro-detection voltage comparator exports high level under vehicle.
8. under electric car according to claim 7 after electricity high-voltage residual-electricity detection device, which is characterized in that the vehicle Lower electro-detection display is Light-emitting diode LED 3, and the anode of the Light-emitting diode LED 3 passes through electricity under circuit and the vehicle The output end connection of voltage comparator U4 is detected, the cathode of Light-emitting diode LED 3 is connected with floating ground GND, when electric-examination under vehicle When surveying voltage comparator output low level, LED3 is not lighted, and indicates to be still within uneasiness after electricity under the vehicle of the electric car Full discharge condition;When electro-detection voltage comparator exports high level under vehicle, LED3 is lighted, and indicates the electric car Discharge condition under vehicle in safety after electricity.
CN201510048158.0A 2015-01-29 2015-01-29 Under electric car after electricity high-voltage residual-electricity detection device Active CN104655959B (en)

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