CN112467841A - Rifle system control circuit charges - Google Patents
Rifle system control circuit charges Download PDFInfo
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- CN112467841A CN112467841A CN202011344032.5A CN202011344032A CN112467841A CN 112467841 A CN112467841 A CN 112467841A CN 202011344032 A CN202011344032 A CN 202011344032A CN 112467841 A CN112467841 A CN 112467841A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging gun system control circuit, which comprises an AC-DC power supply module, a single chip microcomputer, a controller and a relay control circuit, wherein the AC-DC power supply module is connected with a mains supply to supply power to the single chip microcomputer, the controller and the relay control circuit; the single chip microcomputer is provided with a relay control pin, and the input end of the controller is connected with the relay control pin; the relay control circuit comprises a relay K1, a relay K2, a diode D1 and a diode D2, the anodes of primary coils of the relay K1 and the relay K2 are connected with an AC-DC power supply module, and the cathodes of the primary coils are connected with an output pin of the controller; one end of a secondary coil of the relay K1 is connected with a power supply live wire L, and the other end of the secondary coil is connected with an L-pole output end of the charging gun; one end of a secondary coil of the relay K2 is connected with a power supply zero line N, and the other end of the secondary coil is connected with the N-pole output end of the charging gun. The invention can still drive the switch relay at an extremely low temperature, has good adaptability and is more convenient and accurate to control.
Description
Technical Field
The invention relates to the technical field of charging, in particular to a charging gun system control circuit.
Background
The electric vehicle charging pile is used as an energy supply station for the operation of the electric vehicle and is an important matched infrastructure necessary for developing the commercialization of the electric vehicle. The rifle that charges is the electric motor car and fills on electric pile with the commercial power connection and supply power for the equipment of electric motor car.
When the existing electric vehicle is charged, a charging gun is inserted into a vehicle-mounted charging port to be connected with a vehicle-mounted charger, CP is a control connecting wire of the charging gun and the vehicle-mounted charger, the voltage is 12V when the charging gun and the vehicle-mounted charger are connected normally, after a charging control circuit in the charging gun confirms that a signal is normal, the positive voltage of PWM rectangular wave voltage generated by the CP is reduced to 6V from 12V, the negative voltage is-12V, and the charging gun carries out normal charging on the electric vehicle after receiving the signal.
The existing charging gun control circuit drives an MOS (metal oxide semiconductor) tube by pulling a triode through an I/O (input/output) port of a single chip microcomputer so as to conduct a relay and control charging, but under a special geographic environment, if the outdoor temperature in winter in the north can reach-40 ℃, in the environment with such low temperature, the driving current needs to reach 400-500 mA, the existing control circuit structure cannot reach the driving current, so that the relay cannot be attracted, and charging faults occur.
Disclosure of Invention
The invention aims to provide a control circuit of a charging gun system, which has large driving current and can be suitable for driving and charging under a low-temperature environment, and in order to realize the aim, the invention adopts the following technical scheme:
the invention discloses a control circuit of a charging gun system, which comprises an AC-DC power supply module, a single chip microcomputer, a controller and a relay control circuit, wherein the AC-DC power supply module is connected with a mains supply and supplies power to the single chip microcomputer, the controller and the relay control circuit; the single chip microcomputer is provided with a relay control pin, and the input end of the controller is connected with the relay control pin.
The relay control circuit comprises a relay K1, a relay K2, a diode D1 and a diode D2, the anodes of primary coils of the relay K1 and the relay K2 are connected with an AC-DC power supply module, and the cathodes of the primary coils are connected with output pins of the controller; one end of a secondary coil of the relay K1 is connected with a power supply live wire L, and the other end of the secondary coil is connected with an L-pole output end of the charging gun; one end of a secondary coil of the relay K2 is connected with a power supply zero line N, and the other end of the secondary coil is connected with the N-pole output end of the charging gun; the diode D1 is connected in parallel with the primary coil of the relay K1, and the diode D2 is connected in parallel with the primary coil of the relay K2.
Further, the detection circuit comprises a current transformer which is arranged at the front end or the rear end of the secondary coils of the relay K1 and the relay K2; a voltage transformer provided at the tip of the secondary coils of the relay K1 and the relay K2; a leakage transformer provided at the rear end of the secondary coils of the relay K1 and the relay K2; the current and voltage detection chip is connected with the current transformer and the voltage transformer through the input port and transmits detection data to the single chip microcomputer through the output port; and the leakage detection chip is connected with the leakage mutual inductor through an input port and transmits detection data to the single chip microcomputer through an output port.
Preferably, the power supply further comprises an EMC filter circuit, and the mains supply is connected with the AC-DC power supply module after passing through the EMC filter circuit.
Preferably, the ground detection circuit further comprises an isolation capacitor CX1, an isolation capacitor CX2, a first pull-up resistor, a first pull-down resistor and a clamping protection circuit, wherein a power live wire L is connected to one end of the isolation capacitor CX1 through an EMC filter circuit, a power neutral wire N is connected to one end of the isolation capacitor CX2 through the EMC filter circuit, the other ends of the isolation capacitor CX1 and the isolation capacitor CX2 are connected with the front end of the first pull-up resistor, and the rear end of the first pull-up resistor is connected to the input port of the single chip microcomputer; one end of the first pull-down resistor is connected with the rear end of the first pull-up resistor, and the other end of the first pull-down resistor is grounded; one end of the clamping protection circuit is arranged between the first pull-up resistor and the input port of the single chip microcomputer, and the other end of the clamping protection circuit is grounded.
The ground detection circuit further comprises a filter circuit, the filter circuit comprises a plurality of patch inductors and patch capacitors, the patch inductors are connected in series at the rear end of the first pull-up resistor, and the patch capacitors are connected in parallel at two ends of the pull-down resistor.
And the CP signal generation and detection circuit comprises a booster circuit, a voltage stabilizing circuit, an integrated operational amplifier, a negative voltage generation circuit, a direct current filter and a plurality of divider resistors. The integrated operational amplifier is composed of at least four amplifiers, and comprises: the VCC + input pin is connected with the booster circuit, and the other end of the booster circuit is connected to the AC-DC power supply module; the VCC-input pin is connected with the negative voltage generating circuit, and the other end of the negative voltage generating circuit is connected to the switch part of the booster circuit; a first positive input pin, and a first negative input pin and a first output pin whose voltage follows the first positive input pin; the first positive input pin is connected with the AC-DC power supply module; the voltage stabilizing circuit is connected to the front end of the first positive input pin; a second positive input pin, and a second negative input pin and a second output pin of which the voltage follows the second positive input pin; the second positive input pin is connected with the singlechip; a plurality of divider resistors are connected in series between the first output pin and the second output pin; the second output pin is connected with a bleeder resistor in series and then is connected to a CP port of the charging gun; a third positive input pin, and a third negative input pin and a third output pin of which the voltage follows the third positive input pin; the third positive input pin is connected with the CP port of the charging gun; the third negative input pin and the third output pin are connected with the direct current filter; a fourth positive input pin, and a fourth negative input pin and a fourth output pin whose voltages follow the fourth positive input pin; the fourth positive input pin is connected with the direct current filter, and the fourth negative input pin and the fourth output pin are connected to the single chip microcomputer.
Furthermore, the CP signal generation and detection circuit further comprises a voltage reduction circuit and a filter circuit, and the fourth negative input pin and the fourth output pin are connected with the voltage reduction circuit and the filter circuit in sequence and then connected to the single chip microcomputer.
Preferably, the LED lamp control device further comprises an LED indicating lamp module, an LED lamp control foot is arranged on the single chip microcomputer and connected with the controller, and the output end of the controller is connected to the LED indicating lamp module.
Preferably, the single chip microcomputer is connected with a temperature detection circuit, the temperature detection circuit comprises a second pull-up resistor and a second pull-down resistor, the second pull-up resistor is a thermistor, one end of the thermistor is connected to the single chip microcomputer together with the AC-DC power supply module, one end of the thermistor is connected to the single chip microcomputer, one end of the pull-down resistor is connected to the single chip microcomputer, and the other end of the pull-down resistor is grounded.
After the technical scheme is adopted, the invention has the following effects:
1. according to the invention, the singlechip is connected with the controller, the function of controlling the large current of the relay by low voltage is realized by the controller, the switching relay can still be driven at extremely low temperature (-40 ℃), the adaptability is good, and the N pole output end and the L pole output end of the charging gun are respectively controlled by adopting two paths of relays, so that the control is more convenient and accurate.
2. The invention detects input and output voltage, current output and leakage current through the operation collection of the current and voltage detection chip and the leakage detection chip, and provides detection data to the singlechip, and the singlechip can monitor the abnormal conditions of overvoltage, undervoltage, overcurrent, undercurrent and leakage, thereby realizing safe and intelligent control.
3. The grounding detection circuit acquires different voltage waveforms of the power live wire L and the power live wire N when the power live wire L and the power live wire N are not grounded and are grounded to judge whether the power supply is grounded.
4. The CP signal generating and detecting circuit respectively realizes the generation of PWM of +12V and-12V through four amplifiers of the integrated operational amplifier, collects CP voltage values and feeds the CP voltage values back to the single chip microcomputer to realize the CP state of the whole vehicle, so that the charging gun enters different states and gives an alarm, and the charging gun can also be kept stable and reliable under the condition of EMC anti-interference.
Drawings
FIG. 1 is a block diagram of the circuit of the present invention.
Fig. 2 is a diagram of an EMC filter circuit and a ground detection circuit.
Fig. 3 is a circuit diagram of an AC-DC power supply module.
Fig. 4 is a circuit diagram of the single chip microcomputer and the controller.
Fig. 5 is a circuit diagram of a relay control circuit and a detection circuit.
Fig. 6 is a circuit diagram of a CP signal generation and detection circuit.
Fig. 7 is the diagram of fig. 6.
Fig. 8 is a signal diagram showing the PWM rectangular wave voltage connected to be charged.
Fig. 9 is a diagram of a PWM rectangular wave voltage signal indicating charging.
FIG. 10 is a diagram of the PWM rectangular wave voltage signal provided by the pin U3-8 of the single chip microcomputer.
Description of the main symbols:
100: EMC filter circuit, 200: AC-DC power supply module, 300: ground detection circuit, 400: relay control circuit, 500: detection circuit, 600: boost circuit, 700: voltage stabilizing circuit, 800: a negative voltage generating circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the invention discloses a control circuit of a charging gun system, which is characterized in that: the device comprises an EMC filter circuit 100, an AC-DC power supply module 200, a grounding detection circuit 300, a single chip microcomputer U3, a controller U18, a relay control circuit 400, a detection circuit 500 and a CP signal generation and detection circuit.
As shown in fig. 2, the power input terminal of the charging gun is connected to the commercial power, wherein the port 1 is connected to the live wire L of the power supply, the port 2 is connected to the zero wire N of the power supply, and the port 3 is connected to the ground wire PE. After passing through the EMC filter circuit 100, the output ends are a live line L1 end and a neutral line N1 end.
As shown in fig. 3, the AC-DC power supply module is connected to the live line L1 terminal and the neutral line N1 terminal, and finally outputs +5V voltage. The AC-DC power supply module supplies +5V accurate power supply to the single chip microcomputer, the controller and the relay control circuit.
As shown in fig. 2, the ground detection circuit 300 includes an isolation capacitor CX1, an isolation capacitor CX2, a first pull-up resistor, a first pull-down resistor, a clamp protection circuit, and a filter circuit. The first pull-up resistor includes a resistor R1, a resistor R2, a resistor R3, and a resistor R4 connected in series. The first pull-down resistor is resistor RD 1. The clamp protection circuit includes a diode D1, a diode D2. The filter circuit comprises a patch inductor L1, a patch inductor L2, a patch capacitor C1, a patch capacitor C2 and a patch capacitor C3.
The power supply live line L passes through the EMC filter circuit and the output terminal (i.e. the live line L1 terminal) is connected to one terminal of the isolating capacitor CX 1. The output end (namely the end of the neutral wire N1) of the power supply neutral wire N is connected to one end of an isolation capacitor CX2 after passing through an EMC filter circuit. The other ends of the isolation capacitor CX1 and the isolation capacitor CX2 are connected to the front end of the first pull-up resistor (i.e., the resistor R1). The rear end of the first pull-up resistor (namely the rear end of the resistor R4) is connected to the chip inductor L1 and the chip inductor L2 and then connected to the input port U3-2 of the single chip microcomputer. One end of the first pull-down resistor (i.e., resistor RD1) is connected to the rear end of R4, and the other end is grounded. The chip capacitor C1, the chip capacitor C2 and the chip capacitor C3 are connected in parallel to two ends of the resistor RD 1. The clamping protection circuit comprises a diode D1 and a diode D2 which are connected in parallel, the negative electrode of the diode D2 is connected with the AC-DC power supply module, the positive electrode of the diode D2 and the negative electrode of the diode D1 are connected to the input end of the single chip microcomputer, and the positive electrode of the diode D1 is grounded.
The principle of the ground detection circuit 300 is: when power live wire L and power zero line N are not grounded, singlechip input port U3-2 detects 0V voltage through ground detection circuit, when power live wire L and power zero line ground connection are good, singlechip input port U3-2 detects 4 ~ 5V's steamed bread wave voltage through ground detection circuit, the AD signal that the singlechip was gathered according to two kinds of different situations can judge the ground connection condition of power live wire L and power zero line N to make corresponding countermeasure. According to the grounding detection circuit, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are used as first pull-up resistors, and the first pull-down resistor RD1 is formed through the resistor RD1, so that different AD signals can be monitored by the single chip microcomputer under the conditions of poor grounding and large grounding resistance, and the detection accuracy is high. The isolating capacitor CX1 and the isolating capacitor CX2 are adopted, so that the power supply insulation resistance can meet the national requirements.
As shown in fig. 4, the single chip microcomputer U3 is provided with 21 control pins, including: the device comprises a temperature detection pin, a voltage and current detection pin, a leakage detection pin, a relay control pin, an LED lamp control pin, a display screen control pin and the like. The controller U18 comprises 16 pins, and the pins U18-11 are connected with a relay control circuit to control the drive relay K1 and the relay K2.
The input end (U18-6) of the controller is connected with the control pin (U3-9) of the relay. The LED lamp control pins (U3-10, U3-11 and U3-12) are connected with the input ends (U18-3, U18-4 and U18-5) of the controller, and the output ends (U18-12, U18-13 and U18-14) of the controller are connected with the LED indicator lamp module J9. The display screen control pins (U3-1, U3-19) are connected with a display screen port J3. The temperature detection pins (U3-21, U3-16) are connected with a temperature detection circuit, the temperature detection circuit comprises a second pull-up resistor R20 and a second pull-down resistor R21, the second pull-up resistor R20 is a thermistor, one end of the thermistor is connected with the AC-DC power supply module, one end of the thermistor is connected to the single chip microcomputer, one end of the pull-down resistor R21 is connected to the single chip microcomputer, and the other end of the pull-down resistor R21 is grounded.
As shown in fig. 5, the relay control circuit 400 includes a relay K1, a relay K2, a diode D3 and a diode D4, the anodes of the primary coils of the relay K1 and the relay K2 are connected to an AC-DC power supply module (+5V power supply), and the cathodes of the primary coils are connected to a controller output pin U18-11. One end of a secondary coil of the relay K1 is connected with a power supply live wire L, and the other end of the secondary coil is connected with an L-pole output end (L-out) of the charging gun. One end of a secondary coil of the relay K2 is connected with a power supply zero line N, and the other end of the secondary coil is connected with an N-pole output end (N-out) of the charging gun. The diode D3 is connected in parallel with the primary coil of the relay K1, the diode D4 is connected in parallel with the primary coil of the relay K2, and the diode D3 and the diode D4 can prevent reverse spike voltage of the single inverter from damaging the relay and play a role in protecting the relay.
The detection circuit 500 includes: the current transformer HT2, the voltage transformer HT1, the leakage transformer HT3, the current and voltage detection chip U6 and the leakage detection chip U2. A current transformer HT2 is provided at the front end of the secondary coils of the relay K1 and the relay K2. In other embodiments, the current transformer HT2 may also be disposed at the rear end of the secondary coils of the relay K1 and the relay K2. A voltage transformer HT1 is provided at the front end of the secondary coils of the relay K1 and the relay K2. The leakage transformer HT3 is provided at the rear end of the secondary coils of the relay K1 and the relay K2. In fig. 5, R5 is a current sampling resistor, R6, C4, C5, C6 and R7 form a filter circuit for current detection, R10 is a voltage sampling resistor, and R9, R8 and C7 form a filter circuit for voltage detection. The current and voltage detection chip U6 is connected with a current transformer and a voltage transformer through input ports (IP port, IN port and VP port), transmits current detection data to the singlechip pin U3-4 through an output port (RX port), and transmits voltage detection data to the singlechip pin U3-14 through an output port (TX port). The leakage detection chip U2 is connected with the leakage transformer HT3 through input ports (IN1 port and IN2 port), and transmits leakage detection data to the single chip microcomputer pin U3-20 through an output port (OS port).
As shown in fig. 6, the CP signal generating and detecting circuit includes a voltage boosting circuit 600, a voltage stabilizing circuit 700, an integrated operational amplifier U8, a negative voltage generating circuit 800, a dc filter, and a plurality of voltage dividing resistors.
The integrated operational amplifier U8 is composed of four amplifiers, with 14 pins, including: the device comprises a VCC + input pin, a VCC-input pin, a first positive input pin, a first negative input pin, a first output pin, a second positive input pin, a second negative input pin, a second output pin, a third positive input pin, a third negative input pin, a third output pin, a fourth positive input pin, a fourth negative input pin and a fourth output pin, wherein two of the four amplifiers are used for generating a CP signal, and the other two amplifiers are used for rectifying the CP into a stable direct current level and outputting the stable direct current level to the singlechip.
The VCC + input pin is connected to the boost circuit 600, and the other end of the boost circuit 600 is connected to the AC-DC power supply module. In the figure, U7 is a boost chip. The AC-DC power supply module supplies 5V to the voltage boost circuit 600, and the voltage is boosted to 15V through the voltage boost circuit, as shown in the voltage at the position of a point in the figure.
The VCC-input pin is connected with the negative pressure generating circuit, and the other end of the negative pressure generating circuit is connected to the switch part of the booster circuit. The negative voltage generating circuit generates a voltage of-15V at the VCC-input pin (F point position in fig. 6).
The negative voltage generating circuit 800 comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1 and a diode D2, wherein the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is grounded, the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are connected in parallel with the anode and the ground of the diode D1, and the cathode of the diode D1 is connected to the switching part of the voltage boosting circuit (the position of K point in fig. 6).
The voltage of the first negative input pin (1-) and the first output pin (1OUT) follows the first positive input pin (1 +). The first positive input pin is connected with the AC-DC power supply module. The voltage stabilizing circuit 700 is connected to the front end of the first positive input pin. The voltage regulation circuit 700 may be a 431 voltage regulator tube. The voltage stabilizing circuit 700 is composed of a diode U17, a resistor R11 and a resistor R12.
The voltage of the second negative input pin (2-) and the second output pin (2OUT) follows the second positive input pin (2 +). The second positive input pin is connected with a pin U3-8 of the singlechip, and the voltage is input by the singlechip. Two divider resistors are connected in series between the first output pin (1OUT) and the second output pin (2 OUT): resistance R13, resistance R14. And a second output pin (2OUT) is connected in series with a divider resistor R15 and then is connected to the port of the charging gun CP.
The voltage of the third negative input pin (3-) and the third output pin (3OUT) follows the third positive input pin (3 +). And the third positive input pin is connected with the CP port of the charging gun. The third negative input pin and the third output pin are connected with the direct current filter. The direct current filter comprises a diode D5, a resistor R16, a capacitor C8 and a resistor R17. The diode D5 and the resistor R16 are connected in series and then connected with the capacitor C8 and the resistor R17 which are connected in parallel, and the other ends of the capacitor C8 and the resistor R17 are grounded.
The voltage of the fourth negative input pin (4-) and the fourth output pin (4OUT) follows the fourth positive input pin (4 +). The fourth positive input pin is connected with the direct current filter, and the fourth negative input pin and the fourth output pin are connected with the voltage reduction circuit and the filter circuit in sequence and then connected to the pin U3-15 of the single chip microcomputer. The voltage reduction circuit consists of a resistor R18 and a resistor R19. The filter circuit is composed of an inductor L3 and a capacitor C9. The fourth positive input pin sends the collected direct current level to the fourth negative input pin, and then the collected direct current level is output to the single chip microcomputer.
The control schematic diagram of the CP signal generating and detecting circuit is shown in fig. 7, and the control principle is detailed as follows:
when the electric automobile is charged, 12V voltage needs to be generated, and a standby state is indicated. The charging gun is connected with a charging automobile, and a PWM rectangular wave voltage signal as shown in figure 8 needs to be generated on a vehicle-mounted charger, which indicates that the charging gun is connected to be charged. A PWM rectangular wave voltage signal as in fig. 9 is generated on the on-board charger to instruct the charging gun to charge. It is therefore necessary to generate +12V and-12V voltages through the CP signal generation and detection circuit.
Since the voltage generated by the AC-DC power supply module is 5V, the voltage needs to be boosted to a voltage greater than +12V by the voltage boosting circuit 600, and a voltage with a negative voltage less than-12V needs to be generated by the negative voltage generating circuit. The single-chip pin U3-8 provides the PWM rectangular wave voltage as shown in fig. 10.
In this embodiment, the voltage at the point a in fig. 7 is +15V, the voltage at the point B is +3.3V, the voltage at the point C follows the voltage at the point B, and is also +3.3V, and the voltage at the point D follows the second positive input pin, which is the saw-shaped wave voltage in fig. 10. The negative voltage generating circuit generates a voltage of-15V at point F. When the voltage at the point D is 5V, the voltage at the point E is 12V. When the voltage at the point D is 0V, the voltage at the point E is-12V. The CP signal generating and detecting circuit generates 12V and-12V voltages, a vehicle-mounted charger of the automobile is connected with a CP port, and the voltage is reduced by the vehicle-mounted charger, so that the 12V voltage is reduced to 9V or 6V, and charging is realized.
The above description is only a preferred embodiment of the present invention, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a rifle system control circuit charges which characterized in that: the system comprises an AC-DC power supply module, a single chip microcomputer, a controller and a relay control circuit, wherein the AC-DC power supply module is connected with a mains supply and supplies power to the single chip microcomputer, the controller and the relay control circuit; the single chip microcomputer is provided with a relay control pin, and the input end of the controller is connected with the relay control pin;
the relay control circuit comprises a relay K1, a relay K2, a diode D1 and a diode D2, the anodes of primary coils of the relay K1 and the relay K2 are connected with an AC-DC power supply module, and the cathodes of the primary coils are connected with output pins of the controller; one end of a secondary coil of the relay K1 is connected with a power supply live wire L, and the other end of the secondary coil is connected with an L-pole output end of the charging gun; one end of a secondary coil of the relay K2 is connected with a power supply zero line N, and the other end of the secondary coil is connected with the N-pole output end of the charging gun; the diode D1 is connected in parallel with the primary coil of the relay K1, and the diode D2 is connected in parallel with the primary coil of the relay K2.
2. The charge gun system control circuit of claim 1, wherein: also comprises a detection circuit, the detection circuit comprises,
a current transformer provided at the front end or the rear end of the secondary coil of the relay K1 and the relay K2;
a voltage transformer provided at the tip of the secondary coils of the relay K1 and the relay K2;
a leakage transformer provided at the rear end of the secondary coils of the relay K1 and the relay K2;
the current and voltage detection chip is connected with the current transformer and the voltage transformer through the input port and transmits detection data to the single chip microcomputer through the output port;
and the leakage detection chip is connected with the leakage mutual inductor through an input port and transmits detection data to the single chip microcomputer through an output port.
3. The charge gun system control circuit of claim 1, wherein: the electric supply is connected with the AC-DC power supply module through the EMC filter circuit.
4. The charging gun charging control circuit according to claim 3, wherein: the grounding detection circuit comprises an isolation capacitor CX1, an isolation capacitor CX2, a first pull-up resistor, a first pull-down resistor and a clamping protection circuit, a power live wire L is connected to one end of the isolation capacitor CX1 through an EMC filter circuit, a power zero line N is connected to one end of the isolation capacitor CX2 through the EMC filter circuit, the other ends of the isolation capacitor CX1 and the isolation capacitor CX2 are connected with the front end of the first pull-up resistor, and the rear end of the first pull-up resistor is connected to the input port of the single chip microcomputer; one end of the first pull-down resistor is connected with the rear end of the first pull-up resistor, and the other end of the first pull-down resistor is grounded; one end of the clamping protection circuit is arranged between the first pull-up resistor and the input port of the single chip microcomputer, and the other end of the clamping protection circuit is grounded.
5. The charging gun system control circuit of claim 4, wherein: the grounding detection circuit further comprises a filter circuit, the filter circuit comprises a plurality of patch inductors and patch capacitors, the patch inductors are connected in series at the rear end of the first pull-up resistor, and the patch capacitors are connected in parallel at two ends of the pull-down resistor.
6. The charge gun system control circuit of claim 1, wherein: also comprises a CP signal generating and detecting circuit which comprises a booster circuit, a voltage stabilizing circuit, an integrated operational amplifier, a negative pressure generating circuit, a direct current filter and a plurality of divider resistors,
the integrated operational amplifier is composed of at least four amplifiers, and comprises:
the VCC + input pin is connected with the booster circuit, and the other end of the booster circuit is connected to the AC-DC power supply module;
the VCC-input pin is connected with the negative voltage generating circuit, and the other end of the negative voltage generating circuit is connected to the switch part of the booster circuit;
a first positive input pin, and a first negative input pin and a first output pin whose voltage follows the first positive input pin; the first positive input pin is connected with the AC-DC power supply module; the voltage stabilizing circuit is connected to the front end of the first positive input pin;
a second positive input pin, and a second negative input pin and a second output pin of which the voltage follows the second positive input pin; the second positive input pin is connected with the singlechip; a plurality of divider resistors are connected in series between the first output pin and the second output pin; the second output pin is connected with a bleeder resistor in series and then is connected to a CP port of the charging gun;
a third positive input pin, and a third negative input pin and a third output pin of which the voltage follows the third positive input pin; the third positive input pin is connected with the CP port of the charging gun; the third negative input pin and the third output pin are connected with the direct current filter;
a fourth positive input pin, and a fourth negative input pin and a fourth output pin whose voltages follow the fourth positive input pin; the fourth positive input pin is connected with the direct current filter, and the fourth negative input pin and the fourth output pin are connected to the single chip microcomputer.
7. The charge gun system control circuit of claim 6, wherein: the CP signal generation and detection circuit further comprises a voltage reduction circuit and a filter circuit, and the fourth negative input pin and the fourth output pin are connected with the voltage reduction circuit and the filter circuit in sequence and then connected to the single chip microcomputer.
8. The charge gun system control circuit of claim 7, wherein: the direct current filter comprises a diode D5, a resistor R16, a capacitor C8 and a resistor R17, the diode D5 and the resistor R16 are connected in series and then connected with the capacitor C8 and the resistor R17 which are connected in parallel, and the other ends of the capacitor C8 and the resistor R17 are grounded; the negative voltage generating circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1 and a diode D2, wherein the cathode of the diode D1 is connected with the anode of the diode D2, the cathode of the diode D2 is grounded, the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are connected in parallel with the anode and the ground of the diode D1, and the cathode end of the diode D1 is connected to the switch part of the boosting circuit.
9. The charge gun system control circuit of claim 1, wherein: still include LED pilot lamp module, the singlechip on be provided with LED lamp control foot, LED lamp control foot be connected with the controller, the output of controller is connected to LED pilot lamp module.
10. The charge gun system control circuit of claim 1, wherein: the temperature detection circuit comprises a second pull-up resistor and a second pull-down resistor, the second pull-up resistor is a thermistor, one end of the thermistor is connected with the AC-DC power supply module, one end of the thermistor is connected to the single chip microcomputer, one end of the pull-down resistor is connected to the single chip microcomputer, and the other end of the pull-down resistor is grounded.
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| CN113910959A (en) * | 2021-09-30 | 2022-01-11 | 著赫(厦门)新能源技术有限公司 | Charging gun protection circuit without voltage transformer |
| CN116373667A (en) * | 2023-04-06 | 2023-07-04 | 广州云酷智能设备有限公司 | Automatic discernment charging line's fills electric pile |
| WO2024198917A1 (en) * | 2023-03-30 | 2024-10-03 | 比亚迪股份有限公司 | Connection circuit and charging gun |
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| CN116373667B (en) * | 2023-04-06 | 2023-09-22 | 广州云酷智能设备有限公司 | Automatic discernment charging line's fills electric pile |
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| CN112467841B (en) | 2022-12-27 |
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