A CC wake-up circuit for electric vehicles

Abstract

The present invention discloses a CC wake-up circuit for electric vehicles, wherein: the output end of the charging wake-up circuit is electrically connected to the input end of the power switch circuit; the output end of the power switch circuit is connected to the DC power conversion circuit; the output end of the DC power conversion circuit is respectively connected to the CC acquisition circuit and the MCU circuit to supply power for them; the charging wake-up circuit transmits a CC_OPEN signal to the power switch circuit after receiving the CC signal of the charging gun; the CC acquisition circuit acquires the CC signal of the charging gun and transmits an AD_CC signal to the MCU control circuit; the MCU circuit transmits an ignition hold signal to the DC switch circuit. The present invention sets a charging wake-up circuit to briefly wake up the battery management system when the vehicle is charging, and the ignition hold signal output by the MCU control circuit takes over the wake-up until the slow charging ends, and the MCU stops outputting the ignition hold signal, so that the battery management system is powered off after the charging ends; the CC_OPEN signal is set low through the cooperation of capacitor C661 and transistor Q11, and the wake-up function is turned off.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a CC wake-up circuit for an electric vehicle. Background Art

[0002] According to GBT 18487.1-2015 General Requirements for Electric Vehicle Conductive Charging System Part 1, after the slow charging pile is charged, the BMS enters the sleep mode. The existing fast charging CC and slow charging CC wake-up circuits have the following problems: 1. There is no CC wake-up function. When the customer is charging, if the charging wake-up function is abnormal, it may cause the BMS to be unable to enter the working state, resulting in charging start failure. Repeated plugging and unplugging of the charging gun will leave a bad impression on the customer and cause customer complaints. 2. The ordinary CC wake-up circuit is only responsible for waking up the BMS and has no disconnection function. When charging is completed, if the charging gun is not unplugged, the BMS will not be able to enter the sleep mode. The CC wake-up circuit continues to wake up the battery management system, which may cause the electric vehicle's 12V lead-acid battery to lose power. The customer cannot start the vehicle the next time he uses it, causing customer complaints. Summary of the invention

[0003] The purpose of the present invention is to provide an electric vehicle CC wake-up circuit, which solves the existing problems.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention is a CC wake-up circuit for an electric vehicle, comprising: a charging wake-up circuit, a power switch circuit, a DC power conversion circuit, a CC acquisition circuit and an MCU control circuit; the output end of the charging wake-up circuit is electrically connected to the input end of the power switch circuit; the output end of the power switch circuit is electrically connected to the DC power conversion circuit; the output end of the DC power conversion circuit is respectively connected to the CC acquisition circuit and the MCU circuit to power them; the charging wake-up circuit transmits a CC_OPEN signal to the power switch circuit after receiving a CC signal from a charging gun; the CC acquisition circuit acquires the CC signal of the charging gun and transmits an AD_CC signal to the MCU control circuit; the MCU circuit transmits an ignition hold signal to the DC switch circuit;

[0006] Among them, the charging wake-up circuit includes a transistor Q3; the emitter of the transistor Q3 is connected to a 5V voltage source; the base of the transistor Q3 is respectively connected to the S_CHARGE_CC terminal and the Q_CHARGE_CC terminal of the charging gun; the base of the transistor Q3 is also connected in series with a resistor R22 to the 5V voltage source; the collector of the transistor Q3 outputs a CC_OPEN signal to the power switch circuit;

[0007] After the charging wake-up circuit is connected to the charging gun, the S_CHARGE_CC signal or the Q_CHARGE_CC signal is connected, and the transistor Q3 is turned on to transmit the CC_OPEN signal to the power switch circuit;

[0008] The power switch circuit includes a transistor Q11; the collector of the transistor Q11 is connected to the collector of the transistor Q3; the emitter of the transistor Q11 is grounded; a resistor R611 is connected in series between the base and the emitter of the transistor Q11; a resistor R612 is connected in series between the base and the collector of the transistor Q11; and a capacitor C661 is also connected between the base and the collector of the transistor Q11.

[0009] Furthermore, the base of the transistor Q3 is connected in series with a resistor R20 and a diode D13 to the S_CHARGE_CC terminal; the anode of the diode D13 is connected to the resistor R20, and the cathode of the diode D13 is connected to the S_CHARGE_CC terminal; the base of the transistor Q3 is also connected in series with a resistor R21 and a diode D14 to the Q_CHARGE_CC terminal, the anode of the diode D14 is connected to the resistor R21, and the cathode of the diode D14 is connected to the Q_CHARGE_CC terminal; the models of the diode D13 and the diode D14 are both BAS21.

[0010] Furthermore, the transistor Q3 is a PNP transistor; and the transistor Q11 is an NPN transistor.

[0011] Furthermore, the S_CHARGE_CC terminal and the Q_CHARGE_CC terminal of the charging gun are both ground terminals; and the S_CHARGE_CC terminal and the Q_CHARGE_CC terminal are both ground modules connected in series with a resistor with a resistance value of 1KΩ.

[0012] The present invention has the following beneficial effects:

[0013] The present invention sets a charging wake-up circuit to briefly wake up the battery management system when the vehicle is charging, and then the ignition hold signal output by the battery management system MCU control circuit takes over the wake-up until the slow charging is completed, and the MCU stops outputting the ignition hold signal, thereby realizing the power-off function of the battery management system after the charging is completed; through the cooperation of capacitor C661 and transistor Q11, the CC_OPEN signal is set low, and the wake-up function is turned off.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 This is a system block diagram of an electric vehicle fast charging CC and slow charging CC wake-up circuit;

[0017] Figure 2 The circuit diagram of the charging wake-up circuit and the power switch circuit is shown in FIG. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-2 As shown, the present invention is a CC wake-up circuit for an electric vehicle, comprising: a charging wake-up circuit, a power switch circuit, a DC power conversion circuit, a CC acquisition circuit and an MCU control circuit;

[0020] The output end of the charging wake-up circuit is electrically connected to the input end of the power switch circuit; the output end of the power switch circuit is electrically connected to the DC power conversion circuit; the output end of the DC power conversion circuit is respectively connected to the CC acquisition circuit and the MCU circuit to power them;

[0021] After receiving the CC signal from the charging gun, the charging wake-up circuit transmits the CC_OPEN signal to the power switch circuit;

[0022] The CC acquisition circuit collects the CC signal of the charging gun and transmits the AD_CC signal to the MCU control circuit; the MCU circuit transmits the ignition hold signal to the DC switch circuit;

[0023] Among them Figure 2As shown, the charging wake-up circuit includes a transistor Q3; the emitter of the transistor Q3 is connected to a 5V voltage source; the base of the transistor Q3 is respectively connected to the S_CHARGE_CC terminal and the Q_CHARGE_CC terminal of the charging gun; the base of the transistor Q3 is connected in series with a resistor R20 and a diode D13 to the S_CHARGE_CC terminal; the anode of the diode D13 is connected to the resistor R20, and the cathode of the diode D13 is connected to the S_CHARGE_CC terminal; the base of the transistor Q3 is also connected in series with a resistor R21 and a diode D14 to the Q_CHARGE_CC terminal, the anode of the diode D14 is connected to the resistor R21, and the cathode of the diode D14 is connected to the Q_CHARGE_CC terminal. The RGE_CC terminal is connected; the diode D13 and the diode D14 are both BAS21; the S_CHARGE_CC terminal and the Q_CHARGE_CC terminal of the charging gun are both ground terminals; the S_CHARGE_CC terminal and the Q_CHARGE_CC terminal are both ground modules connected in series with a resistor with a resistance value of 1KΩ; the base of the transistor Q3 is also connected in series with a resistor R22 to a 5V voltage source; the collector of the transistor Q3 outputs the CC_OPEN signal to the power switch circuit; when the customer plugs in the charging gun, the S_CHARGE_CC signal / Q_CHARGE_CC signal is connected, the transistor Q3 is turned on, and the CC_OPEN voltage becomes a high level;

[0024] After the charging wake-up circuit is connected to the charging gun, the S_CHARGE_CC signal or the Q_CHARGE_CC signal is connected, and the transistor Q3 is turned on to transmit the CC_OPEN signal to the power switch circuit; the power switch circuit includes a transistor Q11; the collector of the transistor Q11 is connected to the collector of the transistor Q3; the emitter of the transistor Q11 is grounded; a resistor R611 is connected in series between the base and the emitter of the transistor Q11; a resistor R612 is connected in series between the base and the collector of the transistor Q11; a capacitor C661 is also connected between the base and the collector of the transistor Q11; the S_CHARGE_CC signal or the Q_CHARGE_CC signal corresponds to the slow charging gun and the fast charging gun respectively;

[0025] Among them, the transistor Q3 is a PNP transistor; the transistor Q11 is an NPN transistor; the resistance values ​​of the resistors R20, R21 and R612 are all 10KΩ; the resistance value of the resistor R22 is 100KΩ; and the resistance value of the resistor R611 is 22KΩ.

[0026] Embodiment 1: This embodiment is a working principle of an electric vehicle CC wake-up circuit: when the customer plugs in the charging gun, the S_CHARGE_CC signal / Q_CHARGE_CC signal is connected, the transistor Q3 is turned on, the CC_OPEN voltage becomes a high level, the power switch circuit is turned on, and the BMS starts to work. After the BMS works, its own ignition keeps the signal turned on. Due to the charging effect of capacitor C661, the transistor Q11 is slowly turned on. After that, the transistor is turned on, CC_OPEN is set low, and the wake-up function is no longer performed.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An electric vehicle CC wake-up circuit, characterized in that: include: Charging wake-up circuit, power switch circuit, DC power conversion circuit, CC acquisition circuit and MCU control circuit; The output end of the charging wake-up circuit is electrically connected to the input end of the power switch circuit; the output end of the power switch circuit is electrically connected to the DC power conversion circuit; the output end of the DC power conversion circuit is respectively connected to the CC acquisition circuit and the MCU circuit to power them; The charging wake-up circuit transmits a CC_OPEN signal to the power switch circuit after receiving the CC signal from the charging gun; The CC acquisition circuit acquires the CC signal of the charging gun and transmits the AD_CC signal to the MCU control circuit; the MCU circuit transmits the ignition hold signal to the DC switch circuit; Among them, the charging wake-up circuit includes a transistor Q3; the emitter of the transistor Q3 is connected to a 5V voltage source; the base of the transistor Q3 is respectively connected to the S_CHARGE_CC terminal and the Q_CHARGE_CC terminal of the charging gun; the base of the transistor Q3 is also connected in series with a resistor R22 to the 5V voltage source; the collector of the transistor Q3 outputs a CC_OPEN signal to the power switch circuit; After the charging wake-up circuit is connected to the charging gun, the S_CHARGE_CC signal or the Q_CHARGE_CC signal is connected, and the transistor Q3 is turned on to transmit the CC_OPEN signal to the power switch circuit; The power switch circuit includes a transistor Q11; the collector of the transistor Q11 is connected to the collector of the transistor Q3; the emitter of the transistor Q11 is grounded; a resistor R611 is connected in series between the base and the emitter of the transistor Q11; a resistor R612 is connected in series between the base and the collector of the transistor Q11; a capacitor C661 is also connected between the base and the collector of the transistor Q11; The base of the transistor Q3 is connected in series with a resistor R20 and a diode D13 to the S_CHARGE_CC terminal; The base of the transistor Q3 is also connected in series with a resistor R21 and a diode D14 to the Q_CHARGE_CC terminal; The transistor Q3 is a PNP transistor; the transistor Q11 is an NPN transistor; The S_CHARGE_CC terminal and the Q_CHARGE_CC terminal of the charging gun are both ground terminals; When the customer plugs in the charging gun, the S_CHARGE_CC signal / Q_CHARGE_CC signal is connected, the transistor Q3 is turned on, the CC_OPEN voltage becomes high, the power switch circuit is turned on, and the BMS starts to work. After the BMS works, its own ignition keeps the signal on. Due to the charging effect of capacitor C661, the transistor Q11 is slowly turned on. After that, the transistor is turned on, CC_OPEN is set low, and the wake-up function is no longer performed.

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