阅读说明：本技术 一种充电cc信号的检测与单次唤醒电路 (Detection and single wake-up circuit for charging CC signal ) 是由 徐良渡 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种充电CC信号的检测与单次唤醒电路,包括保护模块,外部充电枪通过充电接口与保护模块相连,保护模块与CC信号检测模块相连,所述CC信号检测模块分别和唤醒模块、电容快速放电模块相连。在完成充电连接确认信号CC连接检测的同时实现对电控单元的一次性唤醒,并且单次唤醒持续时间可根据电动汽车或电控单元需求进行参数配置,保证快速插拔充电枪的响应,确保充电连接确认信号CC在单次插充电枪时有效唤醒,而且不会持续唤醒,同时保证支持快速插拔操作,不影响用户使用习惯。(The invention discloses a detection and single-time wake-up circuit for charging CC signals, which comprises a protection module, wherein an external charging gun is connected with the protection module through a charging interface, the protection module is connected with a CC signal detection module, and the CC signal detection module is respectively connected with a wake-up module and a capacitance quick discharge module. The charging connection confirmation signal CC is connected and detected, meanwhile, the electric control unit is waken up once, the single wakening duration time can be configured according to the requirements of the electric automobile or the electric control unit, the response of the quick plug charging gun is guaranteed, the charging connection confirmation signal CC is guaranteed to be waken up effectively when the charging gun is inserted into the single plug, the quick plug operation is guaranteed to be supported, and the use habit of a user is not influenced.)

1. The utility model provides a detection and single circuit of awakening up of CC signal that charges which characterized in that, includes protection module (2), and outside rifle (1) that charges links to each other with protection module (2) through the interface that charges, and protection module (2) link to each other with CC signal detection module (3), CC signal detection module (3) link to each other with awakening up module (4), electric capacity quick discharge module (5) respectively.

2. The single wake-up and detection circuit for charging CC signals according to claim 1, characterized in that said protection module (2) comprises an ESD tube ZD1 and a capacitor C2, said ZD1 and said C2 are connected in parallel and are connected in series between the charging interface and the ground.

3. The CC signal detection and single-wake-up circuit for charging of claim 1, wherein the CC signal detection module (3) comprises a resistor R1, a resistor R4, a capacitor C3 and an ADC sampling circuit, wherein the resistor R1 and the resistor R4 are respectively connected in series with the charging interface, the capacitor C3 is connected in parallel with the charging interface, the ADC sampling circuit is connected in series with the resistor R4, and when the external charging gun (1) is connected, the resistor Rcc is connected in series with the resistor R4.

4. The charging CC signal detection and single-time wake-up circuit according to claim 1, wherein said wake-up module (4) comprises a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a capacitor C1 and a transistor Q1, the E pole of the transistor Q1 is connected to the current input terminal, the B pole of the transistor Q1 is sequentially connected in series with a resistor R3 and a capacitor C1, the C pole of the transistor Q1 is respectively connected in series with the resistor R5 and the resistor R6, the C pole of the transistor Q1 outputs the wake-up signal through the resistor R5 and is grounded through the resistor R6, the two ends of the resistor R2 are respectively connected to the current input terminal and the B pole of the transistor Q1, and the two ends of the resistor R1 are respectively connected to the current input terminal and the capacitor C1.

5. The detection and one-shot wake-up circuit of claim 4, the fast capacitor discharging module (5) is characterized by comprising a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a capacitor C1 and a triode Q1, wherein an E pole of the triode Q1 is connected with a current input end, a B pole of the triode Q1 is sequentially connected with the resistor R3 and the capacitor C1 in series, a C pole of the triode Q1 is respectively connected with the resistor R5 and the resistor R6 in series, a C pole of the triode Q1 outputs a wake-up signal after passing through the resistor R5 and is grounded after passing through the resistor R6, two ends of the resistor R2 are respectively connected with the current input end and a B pole of the triode Q1, two ends of the resistor R1 are respectively connected with the current input end and the capacitor C1, one end of a diode D1 is connected with the current input end, the other end of the diode D1 is located between the capacitor C1 and the resistor R3.

6. The single-shot wake-up circuit of claim 5, wherein said capacitor C1 has a capacitance substantially greater than that of capacitor C2.

Technical Field

The invention relates to the field of electric automobiles, in particular to a detection and single-time wake-up circuit for charging CC signals.

Background

With the rapid development of the electric automobile industry, the national standards for vehicle charging management and control are increased, and for alternating current slow charging of the electric automobile, the requirements for connection confirmation of a charging gun and the vehicle for CC signals and charging guide CP signals are increased. The charging connection confirmation signal CC is used to confirm the connection state of the charging gun and the electric vehicle, and to specify the maximum current that the charging cable can bear. The control confirmation signal CP is used to monitor the interaction between the electric vehicle and the power supply device.

The CP signal is an active signal and can be used as a wake-up source, but the state thereof has various states such as 12V, PWM _9V, PWM _6V and-12V, so that when the CP signal is used as a wake-up source, software is required to perform processing and control, and the circuit is relatively complex and has high cost. The CC connection confirmation signal is essentially a resistor connected externally and is passive. When the wake-up circuit is used as a wake-up signal, a power supply (or a conversion source) of a low-voltage lead-acid battery of the electric automobile is required to be used as a pull-up, the wake-up circuit generates a current path when being connected to the CC resistor, and conducts related circuits to generate signal changes so as to wake up the power circuit and start the control circuit to work. The scheme has the advantages of relatively simple circuit, no need of software control and low cost, and is widely applied to an electric vehicle battery management system or a vehicle-mounted charging power supply.

Chinese patent document CN107415737A discloses an "electric vehicle charging wake-up system". The charging connection module is provided with a divider resistor, the power supply awakening module is provided with a circuit on-off control element, when the charging connection module is connected with an external charging gun, the pull-down resistor of the external charging gun is connected into a charging awakening system and forms partial pressure with the divider resistor of the charging connection module, and the voltages at the two ends of the pull-down resistor are switched on the circuit on-off control element of the power supply awakening module, and the power supply is effectively connected into a battery management system.

When the rifle that charges inserts, when charging connection confirmation signal CC connects promptly, its external resistance partial pressure will persist, awaken signal also can persist, and awaken signal existence can lead to awakening the circuit and have lasting operating current to exist, is awaken the electrical control unit simultaneously and also can't be gone down to be in operating condition always, and at this moment on-vehicle lead acid battery will maintain the consumption of certain electric current, leads to lead acid battery insufficient current to be difficult to normally start or the battery charges repeatedly and causes the battery to damage easily, causes the potential safety hazard.

Disclosure of Invention

The invention mainly solves the technical problem that the original electric control unit is awakened continuously by a charging connection confirmation signal CC, and provides a charging CC signal detection and single-time awakening circuit, which realizes one-time awakening of the electric control unit while completing the charging connection confirmation signal CC connection detection, and parameter configuration can be carried out according to the requirements of an electric vehicle or the electric control unit within the single-time awakening duration time, so that the response of quickly plugging and unplugging a charging gun is ensured, the charging connection confirmation signal CC is ensured to be awakened effectively when the charging gun is plugged once, and cannot be awakened continuously, and the quick plugging and unplugging operation is ensured to be supported, and the use habit of a user is not influenced.

The technical problem of the invention is mainly solved by the following technical scheme: the device comprises a protection module, wherein an external charging gun is connected with the protection module through a charging interface, the protection module is connected with a CC signal detection module, and the CC signal detection module is respectively connected with a wake-up module and a capacitance quick discharge module. When the external charging gun is connected, a charging connection confirmation signal CC is connected, the charging connection confirmation signal CC reaches the CC signal detection module after passing through the protection module, the CC signal detection module obtains an external resistance value through reverse calculation and judges the connection state of the charging gun and the cable capacity according to the resistance value, then the charging connection confirmation signal CC is sent out through the awakening module to awaken the electric control power supply to charge, when the external charging gun is pulled out, the electric connection confirmation signal CC is separated, the external resistance is disconnected, discharging is rapidly completed, and the charging gun is rapidly inserted to support to awaken work again.

Preferably, the protection module comprises an ESD tube ZD1 and a capacitor C2, and the ESD tube ZD1 and the capacitor C2 are connected in parallel and are connected in series between the charging interface and the ground terminal. The static electricity of the interface is restrained from directly discharging and discharging in the air, and the protection of a post-stage circuit is achieved.

Preferably, the CC signal detection module includes a resistor R1, a resistor R4, a capacitor C3, and an ADC sampling circuit, wherein the resistor R1 and the resistor R4 are respectively connected in series with the charging interface, the capacitor C3 is connected in parallel with the charging interface, the ADC sampling circuit is connected in series with the resistor R4, and when the external charging gun is connected, the resistor Rcc is connected in series with the resistor R4. Through 12V pull-up, R1 and Rcc form partial pressure, the partial pressure is sent to ADC for sampling after R4 and C3 filtering, the sampling voltage is set as V1, the CC signal detection module obtains an external resistance value through reverse calculation, and the connection state of the charging gun and the capacity of the cable are judged according to the resistance value.

Preferably, the wake-up module includes a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a capacitor C1, and a transistor Q1, an E pole of the transistor Q1 is connected to the current input terminal, a B pole of the transistor Q1 is sequentially connected in series to the resistor R3 and the capacitor C1, a C pole of the transistor Q1 is respectively connected in series to the resistor R5 and the resistor R6, a C pole of the transistor Q1 outputs a wake-up signal after passing through the resistor R5 and is grounded after passing through the resistor R6, two ends of the resistor R2 are respectively connected to the current input terminal and the B pole of the transistor Q1, and two ends of the resistor R1 are respectively connected to the current input terminal and the capacitor C1. When CC is accessed, R1 is known to divide the voltage with Rcc, and the voltage obtained at Rcc is V1. At this time, the both ends of the capacitor C1 are 0V, but an external voltage (12V-Vbe-V1) exists, and a current path sequentially passing through the current input terminal, the transistor Q1, the resistor R3C, the resistor Rcc, and the ground terminal is generated to charge the capacitor C1, and the maximum charging current Ic is (12V-Vbe-V1)/R3. Meanwhile, because the reverse voltage of the B pole and the E pole of the transistor Q1 flows through, the C pole and the E pole of the transistor Q1 are conducted, the current input end outputs a wake-up signal through the transistor Q1 and the current-limiting resistor R5, and the resistor R6 is used for ensuring that the wake-up signal is kept at a low level when the transistor Q1 is not conducted.

Preferably, the capacitor fast discharging module includes a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a capacitor C1, and a transistor Q1, an E pole of the transistor Q1 is connected to a current input terminal, a B pole of the transistor Q1 is sequentially connected in series to the resistor R3 and the capacitor C1, a C pole of the transistor Q1 is respectively connected in series to the resistor R5 and the resistor R6, a C pole of the transistor Q1 outputs a wake-up signal through the resistor R5 and is grounded through the resistor R6, two ends of the resistor R2 are respectively connected to the current input terminal and a B pole of the transistor Q1, two ends of the resistor R1 are respectively connected to the current input terminal and the capacitor C1, one end of the diode D1 is connected to the current input terminal, the other end is located between the capacitor C1 and the resistor R3, and the protection module is connected in series. When the charging gun is pulled out, the CC signal is disconnected, the voltage across the capacitor C1 cannot change suddenly due to the fact that the resistor R1 and the resistor Rcc are not divided, the current is discharged rapidly through the diode D1, the resistor R1 and the capacitor C1 in sequence, the maximum discharging current Id is about R3/R1 times of the maximum charging current Ic, the resistance value of the resistor R3 is far greater than that of the resistor R1, the discharging time is about t 2-5 × R1 × C1 and is far less than t1, therefore, discharging of the capacitor C1 can be completed in a short time, meanwhile, the current input end rapidly charges the capacitor C2 to 12V through the resistor R1, and the quick-plug-in charging gun wakeup work is supported.

Preferably, the capacitance value of the capacitor C1 is much larger than that of the capacitor C2.

The invention has the beneficial effects that: the charging connection confirmation signal CC is connected and detected, meanwhile, the electric control unit is waken up once, the single wakening duration time can be configured according to the requirements of the electric automobile or the electric control unit, the response of the quick plug charging gun is guaranteed, the charging connection confirmation signal CC is guaranteed to be waken up effectively when the charging gun is inserted into the single plug, the quick plug operation is guaranteed to be supported, and the use habit of a user is not influenced. .

Drawings

Fig. 1 is a block diagram of a circuit schematic connection structure of the present invention.

Fig. 2 is a circuit diagram of the present invention.

Fig. 3 is a circuit diagram of the CC signal detection module of the present invention.

Fig. 4 is a circuit diagram of the wake-up module of the present invention.

Fig. 5 is a circuit diagram of the capacitor fast discharge module of the present invention.

In the figure, a charging gun is 1, a protection module is 2, a 3CC signal detection module is 4, a wake-up module is 4, and a capacitance quick discharge module is 5.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.