Electric energy storage pre-activation circuit

Abstract

The application relates to the field of battery charging circuits, in particular to an electric energy storage pre-waking circuit, which comprises an activation line detection circuit, a current waking circuit, a pre-charging voltage detection control circuit, a pre-charging control circuit and an MCU; after a charger is connected with a charging power supply, the activation line detection circuit outputs an activation signal to the MCU, so that the MCU receives the activation signal, runs an activation program, and makes the current waking circuit, the pre-charging voltage detection control circuit and the pre-charging control circuit be activated; after the current waking circuit is activated, real-time current data of a pre-charging circuit is output to the MCU; after the pre-charging voltage detection control circuit is activated, voltage data of the pre-charging circuit is output to the MCU; and after the pre-charging control circuit is activated, a control signal is output to a controller of the pre-charging circuit to perform a pre-charging operation, so as to avoid the appearance of inrush current and protect the battery and the circuit.

Description

Technical Field

[0001] This application belongs to the field of battery charging circuits, and in particular relates to energy storage and pre-call circuits. Background Technology

[0002] With the increasing number of electric bicycles on the road, manufacturers are paying more and more attention to the battery management system. The main function of the lithium battery protection board is to intelligently manage and maintain each battery cell, prevent overcharging and over-discharging, extend battery life, and monitor battery status.

[0003] At the moment the battery is connected to the charger, a surge current will occur due to the high voltage output of the charger (such as 400V), which may cause problems such as the main contactor contacts to melt and solder, the PCB copper foil to burn, and the battery to trigger protection due to instantaneous voltage drop. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, the purpose of this application is: 1111. To achieve the above objective, this application provides the following technical solution: The energy storage and pre-call circuit includes: an activation line detection circuit, a current wake-up circuit, a pre-charge voltage detection and control circuit, a pre-charge control circuit, and an MCU; among which, The activation line detection circuit is used to detect the voltage output by the charger and output a signal to the MCU after detecting the voltage output by the charger. The current wake-up circuit is used to detect the current in the pre-charging circuit and output a signal to the MCU after detecting the current. The precharge voltage detection and control circuit is used to detect the precharge voltage and output voltage to the precharge control circuit. The precharge control circuit is used to control the opening and closing of the precharge circuit.

[0005] Furthermore, the activation line detection circuit includes a resistor R9, one end of which is connected to the positive output terminal of the charger, and the other end of which is connected to one end of a resistor R11, and the other end of which is connected to the C+_CK pin of the MCU.

[0006] Furthermore, the current wake-up circuit includes an operational amplifier, with pins 2 and 3 of the operational amplifier connected to the negative and positive terminals of the pre-charge circuit, respectively, and pin 1 of the operational amplifier connected to the WKUP_IC pin of the MCU.

[0007] Furthermore, it also includes a battery management chip, which is used to output the voltage required for operation of the operational amplifier.

[0008] Furthermore, the pre-charge voltage detection and control circuit includes MOSFET Q15, transistor Q13, and MOSFET Q19. The gate (G) of MOSFET Q15 is connected to the Pck_CTL pin of the MCU, the drain (D) of MOSFET Q15 is connected to the positive terminal of the 12V power supply, and the drain of MOSFET Q15 is also connected to the base (B) of transistor Q13. The source (S) of MOSFET Q15 is grounded. The emitter (E) of transistor Q13 is connected to the positive terminal of the 12V power supply, the collector (C) of transistor Q13 is grounded, and the collector (C) of transistor Q13 is also connected to the gate (G) of MOSFET Q19. The drain of MOSFET Q19 is connected to the negative output terminal (C-) of the charger, the source (S) of MOSFET Q19 is grounded, and the source of MOSFET Q19 is also connected to the Pre_V pin of the MCU.

[0009] Furthermore, the pre-charge control circuit includes a transistor Q11 and a MOSFET Q12. The gate (G) of the MOSFET Q12 is connected to the Pre_CTL pin of the MCU, the source (S) of the MOSFET Q12 is grounded, the drain (D) of the MOSFET Q12 is connected to the positive terminal of the 12V power supply, and the drain of the MOSFET Q12 is also connected to the base (b) of the transistor Q11. The collector (C) of the transistor Q11 is connected to the controller of the pre-charge circuit, and the emitter (E) of the transistor Q11 is connected to the positive terminal of the 12V power supply.

[0010] The technical effects and advantages of this application are as follows: In this application, after the charger is connected to the charging power supply, the activation line detection circuit outputs an activation signal to the MCU. Upon receiving the activation signal, the MCU runs the activation program, which activates the current wake-up circuit, the pre-charge voltage detection and control circuit, and the pre-charge control circuit. After the current wake-up circuit is activated, it outputs real-time current data of the pre-charge circuit to the MCU. After the pre-charge voltage detection and control circuit is activated, it outputs voltage data of the pre-charge circuit to the MCU. After the pre-charge control circuit is activated, it outputs a control signal to the controller of the pre-charge circuit to perform pre-charge operation, thereby avoiding surge current and protecting the battery and circuit. Attached Figure Description

[0011] Figure 1 This is a circuit diagram of the activation line detection circuit in an embodiment of this application; Figure 2 This is a circuit diagram of the current wake-up circuit in the embodiments of this application; Figure 3 This is a circuit diagram of the precharge voltage detection and control circuit in an embodiment of this application; Figure 4 This is a circuit diagram of the precharge control circuit in an embodiment of this application. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] Example 1: The energy storage and pre-call circuit includes: an activation line detection circuit, a current wake-up circuit, a pre-charge voltage detection and control circuit, a pre-charge control circuit, and an MCU (model STM32F103RBT6); among which, The activation line detection circuit is used to detect the voltage output by the charger and output a signal to the MCU after detecting the voltage output by the charger. The current wake-up circuit is used to detect the current in the pre-charging circuit and output a signal to the MCU after detecting the current. The precharge voltage detection and control circuit is used to detect the precharge voltage and output voltage to the precharge control circuit. The precharge control circuit is used to control the opening and closing of the precharge circuit; Specifically, such as Figure 1 As shown, the activation line detection circuit includes a resistor R9 (2MΩ). Resistor R9 is used for voltage division to reduce the voltage output from the charger to the MCU. One end of resistor R9 is connected to the positive output terminal (C+) of the charger, and the other end of resistor R9 is connected to one end of resistor R11 (1KΩ). The other end of resistor R11 is connected to the C+_CK pin of the MCU. Furthermore, a capacitor C47 is connected in parallel between resistor R9 and C+, with the negative terminal of capacitor C47 grounded. A resistor R10 (100KΩ) is also connected in parallel between resistor R9 and resistor R11, with the negative terminal of resistor R10 grounded. A Zener diode ZT3 and a capacitor C48 are also connected in parallel between resistor R11 and the C+_CK pin, with the negative terminals of Zener diode ZT3 and capacitor C48 grounded to stabilize the voltage output to C+_CK.

[0014] like Figure 2As shown, the current wake-up circuit includes an operational amplifier (model TS393IDT). Pins 2 and 3 of the operational amplifier are connected to the negative and positive terminals of the pre-charge circuit, respectively, and pin 1 of the operational amplifier is connected to the WKUP_IC pin of the MCU. RA5 and RA6, both 30KΩ, are connected in series at pins 2 and 3 of the operational amplifier, respectively. Furthermore, capacitor C37 and resistor RA8 are connected in parallel between resistor RA5 and pin 2 of the operational amplifier. The negative terminals of capacitor C37 and resistor RA8 are grounded. Thus, when current flows through the pre-charge circuit, the operational amplifier outputs a wake-up signal to the MCU. Upon receiving the wake-up signal, the MCU executes the wake-up program.

[0015] In one embodiment of this application, the operational amplifier is powered by a battery management chip. After the MCU outputs an activation signal to the battery management chip, the MCU outputs a 3.3V voltage to the operational amplifier to enable the operational amplifier to start working. The battery management chip is communicatively connected to the MCU.

[0016] like Figure 3 As shown, the precharge voltage detection and control circuit includes MOSFET Q15 (model 2N7002), transistor Q13 (model MMBT5401), and MOSFET Q19 (model DMM24H11DS). The gate (G) of MOSFET Q15 is connected to the Pck_CTL pin of the MCU, and the drain (D) of MOSFET Q15 is connected to the positive terminal of the 12V power supply. Furthermore, the drain of MOSFET Q15 is also connected to the base (B) of transistor Q13, and the source (S) of MOSFET Q15 is grounded. The emitter (E) of transistor Q13 is connected to the positive terminal of the 12V power supply. The collector (c) of transistor Q13 is grounded, and the collector (c) of transistor Q13 is also connected to the gate (G) of MOSFET Q19. The drain (D) of MOSFET Q19 is connected to the negative output terminal (C-) of the charger, and the source (S) of MOSFET Q19 is grounded. The source (S) of MOSFET Q19 is also connected to the Pre_V pin of the MCU. Thus, when the MCU outputs a signal to MOSFET Q15, MOSFET Q15 responds, and its source (S) and drain (D) are connected, thereby connecting the emitter (e) and collector (c) of transistor Q13, which in turn connects the source (S) and drain (D) of MOSFET Q19, thereby causing C- to output voltage to the MCU.

[0017] In one embodiment of this application, RM28 and RM29 are connected in series in the connection circuit between C- and MOSFET Q19 to reduce the voltage output by C- to MOSFET Q19. In addition, RM31 is connected in series in the connection circuit between MOSFET Q19 and the Pre_V pin to reduce the voltage output by MOSFET Q19 to Pre_V. The MCU calculates the voltage value of C- by detecting the voltage output by MOSFET Q19 to Pre_V. In one embodiment of this application, the gate of MOSFET Q19 is also connected to a Zener diode ZG12, and the negative terminal of ZG12 is grounded, thereby enabling transistor Q13 to output a stable control signal to MOSFET Q19.

[0018] like Figure 4 As shown, the precharge control circuit includes transistor Q11 (model MMBT5401) and MOSFET Q12 (model 2N7002). The gate (G) of MOSFET Q12 is connected to the Pre_CTL pin of the MCU, the source (S) of MOSFET Q12 is grounded, and the drain (D) of MOSFET Q12 is connected to the positive terminal of the 12V power supply. Furthermore, the drain of MOSFET Q12 is also connected to the base (B) of transistor Q11. The collector (C) of transistor Q11 is connected to the controller of the precharge circuit, and the emitter (E) of transistor Q11 is connected to the positive terminal of the 12V power supply. Thus, when the MCU outputs a control signal to MOSFET Q12, the source and drain of MOSFET Q12 are connected, thereby connecting the emitter and collector of transistor Q11, and subsequently outputting a control signal to the controller of the precharge circuit.

[0019] In one embodiment of this application, a resistor RM1 with a resistance of 1KΩ is connected in series between the Pre_CTL pin and the MOSFET Q12; a resistor RM34 with a resistance of 30KΩ is connected in series between the MOSFET Q12 and the transistor Q11; a resistor RM35 with a resistance of 100KΩ is connected in series between the 12V power supply and the MOSFET Q12; and a diode D27 (model 1N4148) and a resistor RM36 (with a resistance of 1KΩ) are connected in series between the transistor Q11 and the pre-charge circuit. With this setup, after the charger is connected to the charging power supply, the activation line detection circuit outputs an activation signal to the MCU. Upon receiving the activation signal, the MCU runs the activation program, activating the current wake-up circuit, the pre-charge voltage detection and control circuit, and the pre-charge control circuit. After the current wake-up circuit is activated, it outputs real-time current data of the pre-charge circuit to the MCU. After the pre-charge voltage detection and control circuit is activated, it outputs voltage data of the pre-charge circuit to the MCU. After the pre-charge control circuit is activated, it outputs a control signal to the controller of the pre-charge circuit to perform the pre-charge operation.

[0020] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power reserve pre-activation circuit, characterized in that, include: The circuit includes an activation line detection circuit, a current wake-up circuit, a precharge voltage detection and control circuit, a precharge control circuit, and an MCU; among which, The activation line detection circuit is used to detect the voltage output by the charger and output a signal to the MCU after detecting the voltage output by the charger. The current wake-up circuit is used to detect the current in the pre-charging circuit and output a signal to the MCU after detecting the current. The precharge voltage detection and control circuit is used to detect the precharge voltage and output voltage to the precharge control circuit. The precharge control circuit is used to control the opening and closing of the precharge circuit.

2. The power reserve pre-activation circuit of claim 1, wherein, The activation line detection circuit includes a resistor R9, one end of which is connected to the positive output terminal of the charger, and the other end of which is connected to one end of a resistor R11, and the other end of which is connected to the C+_CK pin of the MCU.

3. The power reserve pre-activation circuit of claim 1, wherein, The current wake-up circuit includes an operational amplifier. Pins 2 and 3 of the operational amplifier are connected to the negative and positive terminals of the pre-charge circuit, respectively, and pin 1 of the operational amplifier is connected to the WKUP_IC pin of the MCU.

4. The power reserve pre-activation circuit of claim 3, wherein, It also includes a battery management chip, which is used to output the voltage required for operation to the operational amplifier.

5. The power reserve pre-activation circuit of claim 1, wherein, The pre-charge voltage detection and control circuit includes MOSFET Q15, transistor Q13, and MOSFET Q19. The gate (G) of MOSFET Q15 is connected to the Pck_CTL pin of the MCU, the drain (D) of MOSFET Q15 is connected to the positive terminal of the 12V power supply, and the drain of MOSFET Q15 is also connected to the base (b) of transistor Q13. The source (S) of MOSFET Q15 is grounded. The emitter (E) of transistor Q13 is connected to the positive terminal of the 12V power supply, the collector (C) of transistor Q13 is grounded, and the collector (C) of transistor Q13 is also connected to the gate (G) of MOSFET Q19. The drain of MOSFET Q19 is connected to the negative output terminal (C-) of the charger, the source (S) of MOSFET Q19 is grounded, and the source of MOSFET Q19 is also connected to the Pre_V pin of the MCU.

6. The power reserve pre-activation circuit of claim 1, wherein, The pre-charge control circuit includes transistor Q11 and MOSFET Q12. The gate (G) of MOSFET Q12 is connected to the Pre_CTL pin of the MCU, the source (S) of MOSFET Q12 is grounded, the drain (D) of MOSFET Q12 is connected to the positive terminal of the 12V power supply, and the drain of MOSFET Q12 is also connected to the base (b) of transistor Q11. The collector (C) of transistor Q11 is connected to the controller of the pre-charge circuit, and the emitter (E) of transistor Q11 is connected to the positive terminal of the 12V power supply.

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