A single wake-up circuit of CC2 of a BMS, a wake-up method and an electric vehicle

Abstract

This invention belongs to the field of new energy technology and provides a CC2 single wake-up circuit, wake-up method, and electric vehicle for a BMS. It solves the technical problem that the traditional standard of using an A+ signal to wake up the BMS cannot meet the wake-up requirements. The technical solution includes: a PMOS transistor, the gate of which is connected to a DC power supply via a delay capacitor, the source of which is also connected to the DC power supply, and the drain of which is connected to the BMS via the enable pin of a DC-DC converter; a charging gun switch, with the charging gun connected to the wake-up circuit via the charging gun switch; when the charging gun switch is off, the enable pin of the DC-DC converter outputs a voltage of 0V, and the BMS is in sleep mode; when the charging gun switch is on, the delay capacitor discharges, the PMOS transistor conducts, and the enable pin output voltage of the DC-DC converter rises from 0V to the DC power supply voltage, waking up the BMS. The capacitor charges, and the voltage on the side of the capacitor closest to the PMOS transistor rises to the DC power supply voltage, making the gate and source voltages of the PMOS transistor equal, causing the PMOS transistor to turn off, and the enable pin output voltage of the DC-DC converter becomes 0V.

Description

Technical Field

[0001] This invention belongs to the field of new energy technology, and in particular relates to a CC2 single wake-up circuit of BMS, a wake-up method, and an electric vehicle. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, the CC2 wake-up circuit of the BMS uses the traditional Chinese standard. Since the A+ signal is always present, OEMs default to waking up the BMS using the A+ signal. Only after detecting the A+ level will they start sending handshake messages. Therefore, using A+ as the wake-up signal will wake up the BMS, and then the BMS will detect its level value. If it meets the requirements, it will proceed to the next step. However, in the new Chinese standard, the A+ signal is always low. The wake-up circuits of the traditional standard and the new standard are not fully compatible, and the existing wake-up circuits cannot meet the wake-up requirements. At the same time, using the A+ signal will cause the fast charging gun to be online all the time, resulting in power loss. Summary of the Invention

[0004] This invention primarily addresses the technical problem that the traditional Chinese standard's A+ signal wake-up of the BMS cannot meet the wake-up requirements. The first aspect of this invention provides a CC2 single-wake-up circuit for the BMS, which, through the cooperation of a PMOS transistor and a charging gun switch, enables single-wake-up of CC2 by turning the PMOS transistor on and off. Even if the fast charging gun is always online, the BMS will not be continuously woken up, thus meeting the new national standard for fast charging while reducing power consumption.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A single wake-up circuit for a BMS (Browser Management System) includes: a PMOS transistor, wherein the gate of the PMOS transistor is connected to a DC power supply via a delay capacitor, the source of the PMOS transistor is connected to a DC power supply, and the drain of the PMOS transistor is connected to the BMS via the enable pin of a DC-DC converter.

[0007] A charging gun switch is provided, and the charging gun is connected to the wake-up circuit via the charging gun switch.

[0008] When the charging gun switch is off, the enable pin of the DC-DC converter outputs 0V, and the BMS goes into sleep mode.

[0009] When the charging gun switch is turned on, the delay capacitor discharges, the PMOS transistor turns on, and the output voltage of the DC-DC enable pin rises from 0V to the DC power supply voltage, waking up the BMS. The capacitor charges, and the voltage on the side of the capacitor closest to the PMOS transistor rises to the DC power supply voltage. The gate voltage and source voltage of the PMOS transistor are equal, the PMOS transistor turns off, and the output voltage of the DC-DC enable pin becomes 0V.

[0010] A second aspect of the present invention provides a wake-up method that uses the CC2 single wake-up circuit based on BMS described in the first aspect for wake-up.

[0011] A third aspect of the present invention provides an electric vehicle, wherein the electric vehicle employs the CC2 single wake-up circuit based on BMS described in the first aspect for wake-up control.

[0012] The beneficial effects of this invention are:

[0013] This invention addresses the technical problem that the traditional Chinese standard's A+ signal for waking up the BMS cannot meet the wake-up requirements. Based on the new national standard, the A+ signal is always at a low level. The cooperation between the PMOS transistor and the charging gun switch, through the conduction and cutoff of the PMOS transistor, enables a single wake-up of CC2. Even if the fast charging gun is always online, it will not continuously wake up the BMS, thus meeting the new national standard for fast charging while reducing power consumption.

[0014] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0016] Figure 1 This is a connection diagram of the CC2 single wake-up circuit structure based on BMS provided in an embodiment of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. It should also be noted that the terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0020] Example 1

[0021] This embodiment provides a CC2 single wake-up circuit based on BMS, such as... Figure 1 As shown, the complete circuit includes a current-limiting resistor R1, a delay capacitor C1, a PMOS transistor Q1, a charging gun switch S1, resistors R2 and R3, a voltage divider resistor R4, and a voltage divider resistor R5.

[0022] The gate of PMOS transistor Q1 is connected in series with resistor R2, capacitor C1, and resistor R1 to the first DC power supply. The source of PMOS transistor Q1 is connected to the second DC power supply. The drain of PMOS transistor Q1 is connected to the enable pin of DC-DC converter and then to the BMS.

[0023] In this embodiment, the voltage values ​​of the first DC power supply and the second DC power supply are equal, which is the battery power supply voltage, preferably 12V.

[0024] The charging gun switch S1 connects the charging gun to the wake-up circuit via the charging gun switch S1.

[0025] One end of the charging gun switch S1 is located between the current-limiting resistor R1 and the delay capacitor C1, and the other end is grounded through the resistor R3.

[0026] One end of the voltage divider resistor R4 is connected to the gate of the PMOS transistor, and the other end is connected to the second DC power supply; one end of the voltage divider resistor R5 is connected to the drain of the PMOS transistor, and the other end is grounded.

[0027] When the charging gun switch S1 is off, the enable pin level of the DC-DC converter is 0, and the BMS goes into sleep mode.

[0028] When the charging gun switch S1 is turned on, capacitor C1 discharges, PMOS transistor Q1 turns on, the enable pin level of DC-DC changes from 0 to the DC power supply voltage value, waking up the BMS. Capacitor C1 charges, and the voltage on the side of capacitor C1 closest to the PMOS transistor rises to the DC power supply voltage value. The gate voltage and source voltage of the PMOS transistor are equal, the PMOS transistor is turned off, and the DC-DC_ENABLE pin becomes 0V.

[0029] In this embodiment, the values ​​of the delay capacitor C1, the second resistor, the first resistor, the third resistor, the fourth resistor, and the fifth resistor can be selected according to actual conditions, such as being related to the specific manufacturer's strategy and technical requirements. The resistors and capacitors mainly affect the overall power consumption and power-on / off time.

[0030] It is understood that in other embodiments, the values ​​of the parameters in the above circuit can be set by those skilled in the art according to the specific operating conditions.

[0031] Example 2

[0032] This embodiment provides a wake-up method using the CC2 single wake-up circuit based on BMS described in Embodiment 1. The wake-up circuit includes a PMOS transistor, the gate of which is connected to a DC power supply via a delay capacitor, the source of which is connected to a DC power supply, and the drain of which is connected to the BMS via the enable pin of a DC-DC converter.

[0033] A charging gun switch is provided, and the charging gun is connected to the wake-up circuit via the charging gun switch.

[0034] When the charging gun switch is off, the enable pin of the DC-DC converter outputs 0V, and the BMS goes into sleep mode.

[0035] When the charging gun switch is turned on, the delay capacitor discharges, the PMOS transistor turns on, and the output voltage of the DC-DC enable pin rises from 0V to the DC power supply voltage, waking up the BMS. The capacitor charges, and the voltage on the side of the capacitor closest to the PMOS transistor rises to the DC power supply voltage. The gate voltage and source voltage of the PMOS transistor are equal, the PMOS transistor turns off, and the output voltage of the DC-DC enable pin becomes 0V.

[0036] Example 3

[0037] This embodiment provides an electric vehicle, which uses the CC2 single wake-up circuit based on BMS as described in Embodiment 1 for wake-up control. The wake-up circuit includes: a PMOS transistor, the gate of which is connected to a DC power supply through a delay capacitor, the source of which is connected to a DC power supply, and the drain of which is connected to the BMS through the enable pin of a DC-DC converter;

[0038] A charging gun switch is provided, and the charging gun is connected to the wake-up circuit via the charging gun switch.

[0039] When the charging gun switch is off, the enable pin of the DC-DC converter outputs 0V, and the BMS goes into sleep mode.

[0040] When the charging gun switch is turned on, the delay capacitor discharges, the PMOS transistor turns on, and the output voltage of the DC-DC enable pin rises from 0V to the DC power supply voltage, waking up the BMS. The capacitor charges, and the voltage on the side of the capacitor closest to the PMOS transistor rises to the DC power supply voltage. The gate voltage and source voltage of the PMOS transistor are equal, the PMOS transistor turns off, and the output voltage of the DC-DC enable pin becomes 0V.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A CC2 single wake-up circuit based on BMS, characterized in that, include: PMOS transistor, delay capacitor, and several resistors; The gate of the PMOS transistor is connected to the DC power supply through a delay capacitor, the source of the PMOS transistor is connected to the DC power supply, and the drain of the PMOS transistor is connected to the BMS through the enable pin of the DC-DC converter. A charging gun switch is provided, through which the charging gun is connected to a wake-up circuit. When the charging gun switch is off, the enable pin of the DC-DC converter outputs 0V, and the BMS goes into sleep mode. When the charging gun switch is turned on, the delay capacitor discharges, the PMOS transistor turns on, and the output voltage of the DC-DC enable pin rises from 0V to the DC power supply voltage value, waking up the BMS. The capacitor charges, and the voltage on the side of the capacitor closest to the PMOS transistor rises to the DC power supply voltage value. The gate voltage and source voltage of the PMOS transistor are equal, the PMOS transistor turns off, and the output voltage of the DC-DC enable pin becomes 0V. The gate of the PMOS transistor is connected to the DC power supply via a second resistor, a delay capacitor, and a first resistor in series. One end of the charging gun switch is located between the first resistor and the delay capacitor, and the other end is grounded through a third resistor. The PMOS transistor and the charging gun switch work together to enable single-time wake-up of CC2 by turning the PMOS transistor on and off. Even if the fast charging gun is always online, it will not keep waking up the BMS, thus reducing power consumption.

2. The CC2 single wake-up circuit based on BMS as described in claim 1, characterized in that, It also includes a fourth resistor and a fifth resistor. One end of the fourth resistor is connected to the gate of the PMOS transistor, and the other end is connected to a DC power supply. One end of the fifth resistor is connected to the drain of the PMOS transistor, and the other end is grounded.

3. The CC2 single wake-up circuit based on BMS as described in claim 1, characterized in that, The voltage of the DC power supply is 12V.

4. A wake-up method, characterized in that, include: Wake-up is performed using the CC2 single wake-up circuit based on BMS as described in any one of claims 1-3.

5. An electric vehicle, characterized in that: The electric vehicle uses the CC2 single wake-up circuit based on BMS as described in any one of claims 1-3 for wake-up control.

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