CN113484586A - Device for detecting auxiliary power consumption differential pressure of electric automobile high-voltage relay control - Google Patents
Device for detecting auxiliary power consumption differential pressure of electric automobile high-voltage relay control Download PDFInfo
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- CN113484586A CN113484586A CN202110789884.3A CN202110789884A CN113484586A CN 113484586 A CN113484586 A CN 113484586A CN 202110789884 A CN202110789884 A CN 202110789884A CN 113484586 A CN113484586 A CN 113484586A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The invention relates to a device for detecting auxiliary power consumption differential pressure for controlling a high-voltage relay of an electric automobile, which comprises a pre-charging resistance circuit, a differential pressure detection circuit and an optical coupling isolation self-locking circuit, wherein the input end of the differential pressure detection circuit is connected with the pre-charging resistance circuit, the output end of the differential pressure detection circuit is connected with the optical coupling isolation self-locking circuit, when the pre-charging voltage of the pre-charging resistance circuit rises to be larger than a set reference voltage, a high level is output to the differential pressure detection circuit, a pre-charging completion signal is collected, and a main relay is controlled to be closed and the pre-charging relay is controlled to be opened. The device for detecting the auxiliary power consumption voltage difference of the electric automobile high-voltage relay control is adopted, and the voltage difference detection device is combined with the whole automobile controller and used for protecting the high-voltage relay contact and prolonging the service life of the high-voltage relay; reducing the failure rate of the vehicle; convenience is provided for a controller of the high-voltage relay; the device is convenient to control, the control is mutually independent, the mutual communication is not needed, and who controls the acquisition is clear, and the control responsibility division is clear.
Description
Technical Field
The invention relates to the field of electric automobile high-voltage relay control, in particular to a device for detecting auxiliary power utilization differential pressure of electric automobile high-voltage relay control.
Background
The high-voltage equipment used on the electric automobile is more, and comprises a driving motor controller, a generator controller, a DC/DC, an air conditioner DC/AC, a steering/air pump DC/AC, a total positive relay and a total negative relay inside a battery pack and the like; the driving motor controller and the generator controller have a voltage detection function, and the vehicle control unit needs to communicate with the motor controller to obtain information and then control the relay to act; other high-voltage electrical appliances do not have a voltage detection function, and the pre-charging time needs to be calculated according to the internal capacitor of the controller; in addition, the pre-charging voltage does not meet the requirement, and the contact of the relay is adhered to cause the damage of the relay.
Because the interior of a plurality of high-voltage electrical equipment does not have a voltage acquisition function and the capacitance capacity of the interior of a high-voltage input end is different, in order to simplify the circuit and save the cost, a plurality of high-voltage electrical equipment generally share one accessory high-voltage relay when a high-voltage distribution box is designed; the capacitance estimation is inaccurate, the condition that the relay is adhered can be caused due to poor pre-charging control, and the contact is dirtied due to sparks at the contact of the relay, so that the contact is poor in contact and generates heat to cause a fault (the contact of the relay is yellow and black).
The high-voltage relay is one of the key components for high-voltage control of the electric automobile, and high-voltage components need to control a high-voltage input end to be electrified at high voltage and then enable the high-voltage components to be electrified at low voltage; because the electrolytic capacitor capacity of the internal input end of each high-voltage component is different, and the internal voltage detection function is not available, the contact of the relay can be adhered or the service life of the relay can be shortened due to poor control, and therefore, the use of one voltage difference detection device is very important for the power-on and power-off control of the relay when the relay is electrified at high voltage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the device for detecting the auxiliary power consumption differential pressure for the control of the high-voltage relay of the electric automobile, which has the advantages of low failure rate, convenience in control and long service life.
In order to achieve the above object, the device for detecting the voltage difference for assisting the control of the high-voltage relay of the electric vehicle according to the present invention comprises:
this a device for supplementary power consumption pressure differential detection of electric automobile high-voltage relay control, its key feature is, the device include pre-charge resistance circuit, voltage difference detection circuit and opto-coupler isolation self-locking circuit, voltage difference detection circuit's input link to each other with pre-charge resistance circuit, output MCU + links to each other with machine controller's MCU +, pre-charge resistance circuit's pre-charge voltage rise to when being greater than the reference voltage of settlement, output high level to voltage difference detection circuit, gather the pre-charge and accomplish the signal and control main relay closure and pre-charge relay disconnection.
Preferably, the device includes GY + pin, MCU + pin, GY-pin, VCC pin, GND pin and VCU input pin, GY + pin connect the preliminary filling relay, MCU + pin connects the main relay, GY-pin connect the high voltage negative pole, VCC pin connect the body low voltage power supply, GND pin connect the battery negative pole, VCU input pin connect the preliminary filling and accomplish the signal, meet with main relay feedback contact equally.
Preferably, the VCU input pin receives an enable signal, closes the precharge relay, and closes the main relay after the VCU input pin acquires a precharge completion feedback signal when the voltage rises to a preset voltage difference range; the input pin of the VCU is used for disconnecting the pre-charging relay after acquiring a contact signal fed back by the main relay; and after the input pin of the VCU acquires power-off, the main relay is disconnected.
The device for detecting the auxiliary power consumption voltage difference of the electric vehicle high-voltage relay control is adopted, and the voltage difference detection device is combined with the vehicle control unit and is used for protecting the high-voltage relay contact and prolonging the service life of the high-voltage relay; reducing the failure rate of the vehicle; convenience is provided for a controller of the high-voltage relay; the device is convenient to control, the control is mutually independent, the mutual communication is not needed, and who controls the acquisition is clear, and the control responsibility division is clear.
Drawings
FIG. 1 is a schematic diagram of an apparatus for detecting a voltage difference for assisting electric vehicle high-voltage relay control according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
Referring to fig. 1, the device for detecting the auxiliary power consumption voltage difference for the control of the high-voltage relay of the electric vehicle comprises a pre-charging resistor circuit, a voltage difference detection circuit and an optical coupling isolation self-locking circuit, wherein the input end of the voltage difference detection circuit is connected with the pre-charging resistor circuit, the output end of the voltage difference detection circuit is connected with an MCU + of a motor controller, when the pre-charging voltage of the pre-charging resistor circuit rises to be greater than a set reference voltage, a high level is output to the voltage difference detection circuit, a pre-charging completion signal is collected, and a main relay is controlled to be closed and a pre-charging relay is controlled to be disconnected.
As a preferred embodiment of the invention, the device comprises a GY + pin, an MCU + pin, a GY-pin, a power supply + pin and a VCU input pin, wherein the GY + pin is connected with the 2 end of a contact of a pre-charging relay K2, the MCU + pin is connected with the 2 end of a contact of a main relay K1, the GY-pin is connected with a high-voltage negative electrode, the power supply + pin is connected with a low-voltage power supply of a vehicle body, and the VCU input pin is connected with a feedback signal pin of a voltage difference detection circuit and is also connected with a feedback contact V6 of the main relay K1.
As a preferred embodiment of the present invention, the VCU input pin receives an enable signal, and closes the precharge relay K2, and when the voltage rises to a preset voltage difference range, the VCU input pin collects a precharge completion feedback signal and closes the main relay K1; the VCU input pin is used for switching off the pre-charging relay K2 after acquiring a feedback contact V6 signal of the main relay K1; after the input pin of the VCU acquires power-off, the main relay K1 is switched off.
As a preferred embodiment of the present invention, the voltage difference detection circuit includes a reference voltage sampling circuit and an optical coupling isolation circuit, an input terminal GY + of the voltage difference detection circuit is connected to a contact 2 of the pre-charge relay K2, and an output terminal MCU + of the voltage difference detection circuit is connected to an MCU + of the motor controller; the reference voltage circuit consists of a voltage stabilizing diode D66 and a current limiting and voltage dividing resistor R69; the optical coupling isolation circuit is composed of an optical coupler U66 and a resistor R73.
In the specific implementation mode of the invention, the voltage difference detection device has simple electrical principle, does not need an isolation power supply, an operational amplifier and communication, automatically detects the voltage difference, and directly acquires analog quantity by pure hardware; when the pre-charging voltage rises to be larger than the set reference voltage, a high level (namely a pre-charging completion signal) is output to the VCU, and after the VCU collects the pre-charging completion signal, the main relay K1 is controlled to be closed and the pre-charging relay K2 is controlled to be opened according to a program.
The invention discloses a voltage difference detection device for controlling an auxiliary electric vehicle high-voltage relay, which comprises a pre-charging resistor circuit, a voltage difference detection circuit and an optical coupling isolation circuit; the voltage difference detection circuit comprises a reference voltage sampling circuit and an optical coupling isolation circuit, wherein the reference voltage circuit comprises a voltage stabilizing diode D66 and a current limiting and voltage dividing resistor R69; the optical coupler isolation circuit comprises an optical coupler U66 and a resistor R73.
The invention relates to a high-voltage relay control device for an electric automobile, which comprises a pre-charging resistor circuit, a voltage difference detection circuit and an optical coupling isolation self-locking output circuit, wherein the pre-charging resistor circuit is connected with the pre-charging resistor circuit; the GY + of the high-voltage relay control device is connected with the contact 2 end of the pre-charging relay, and the MCU + is connected with the contact 2 end of the main relay; GY-is connected with a high-voltage negative electrode; the VCC is connected with a low-voltage power supply 12V + or 24V +; GND is connected with the cathode of the storage battery; the pre-charging completion signal is connected with the VCU input pin; the main relay feedback contact is connected with the VCU input pin.
The input end GY + of the voltage difference detection circuit is connected with the 2 end of the pre-charging relay contact, and the output end MCU + of the voltage difference detection circuit is connected with the MCU + of the motor controller; the reference voltage circuit consists of a voltage stabilizing diode D66 and a current limiting and voltage dividing resistor R69. The MCU + is connected with the contact 2 end of the main relay K1; GY-is connected with a high-voltage negative electrode; the power supply + is connected with a low-voltage power supply 12V + or 24V + of the vehicle body; the pre-charging completion feedback signal is connected with the VCU input pin; the feedback contact V6 of the main relay K1 is connected with the input pin of the VCU. The resistance value and the power of the current-limiting voltage-dividing resistor need to be adjusted according to the voltage application range of the power battery.
The working principle is as follows: the vehicle control unit controls the pre-charging relay K2 to be closed, the two ends of the reference voltage circuit can obtain a voltage equal to the voltage of the battery, and the reference voltage is the voltage drop of the battery voltage-the voltage stabilizing diode; normally, the voltage difference is controlled to be more proper at 10V, and then a voltage stabilizing diode of 10V is selected; the voltage of the positive terminal A point of the voltage stabilizing diode D66 is the reference voltage of the optocoupler U66, and the reference voltage is connected with the cathode of the optocoupler control terminal.
When the pre-charging voltage at the position of the B point of the pre-charging resistor R70 rises to be greater than the set reference voltage, the feedback signal end outputs high level to the VCU of the whole vehicle controller, and the VCU collects a pre-charging completion signal and controls the closing of the main relay and the opening of the pre-charging relay.
After the key START is ignited (namely, a signal is enabled), the VCU closes the pre-charging relay after receiving the START, and when the voltage rises to the preset voltage difference range, the input pin of the VCU closes the main relay after acquiring a feedback signal after the pre-charging is completed; then, the pre-charging relay is disconnected after the contact signal fed back by the main relay is acquired; when the power is off, the VCU acquires the power off and disconnects the main relay.
The voltage difference checking device has the advantages of simple circuit principle, no need of isolating a power supply, operational amplifier and communication and automatic detection of the voltage difference.
The principle of the voltage difference device is that when the pre-charging voltage rises to be larger than the set reference voltage, a high level (namely a pre-charging completion signal) is output to the VCU, and the VCU acquires the pre-charging completion signal and then controls the closing of the main relay and the opening of the pre-charging relay according to a program.
The device for detecting the auxiliary power consumption voltage difference of the electric vehicle high-voltage relay control is adopted, and the voltage difference detection device is combined with the vehicle control unit and is used for protecting the high-voltage relay contact and prolonging the service life of the high-voltage relay; reducing the failure rate of the vehicle; convenience is provided for a controller of the high-voltage relay; the device is convenient to control, the control is mutually independent, the mutual communication is not needed, and who controls the acquisition is clear, and the control responsibility division is clear.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (3)
1. The utility model provides a device that is used for supplementary power consumption pressure differential of electric automobile high-voltage relay control to detect, a serial communication port, the device include pre-charge resistance circuit, voltage difference detection circuit and opto-coupler isolation self-locking circuit, voltage difference detection circuit's input link to each other with pre-charge resistance circuit, output MCU + links to each other with machine controller's MCU +, pre-charge resistance circuit's pre-charge voltage rise to when being greater than the reference voltage of settlement, output high level to voltage difference detection circuit gathers the pre-charge and accomplishes the signal and control main relay closure and the disconnection of pre-charge relay.
2. The device as claimed in claim 1, wherein the device comprises a GY + pin, an MCU + pin, a GY-pin, a VCC pin, a GND pin and a VCU input pin, the GY + pin is connected with a pre-charge relay, the MCU + pin is connected with a main relay, the GY-pin is connected with a high voltage negative electrode, the VCC pin is connected with a body low voltage power supply, the GND pin is connected with a battery negative electrode, and the VCU input pin is connected with a pre-charge completion signal and is also connected with a main relay feedback contact.
3. The device for detecting the auxiliary voltage difference for the electric automobile high-voltage relay control according to claim 2, wherein the VCU input pin receives an enable signal, the pre-charging relay is closed, and when the voltage rises to a preset voltage difference range, the VCU input pin collects a pre-charging completion feedback signal and then closes the main relay; the input pin of the VCU is used for disconnecting the pre-charging relay after acquiring a contact signal fed back by the main relay; and after the input pin of the VCU acquires power-off, the main relay is disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110789884.3A CN113484586A (en) | 2021-07-13 | 2021-07-13 | Device for detecting auxiliary power consumption differential pressure of electric automobile high-voltage relay control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110789884.3A CN113484586A (en) | 2021-07-13 | 2021-07-13 | Device for detecting auxiliary power consumption differential pressure of electric automobile high-voltage relay control |
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| CN113484586A true CN113484586A (en) | 2021-10-08 |
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Application publication date: 20211008 |