CN215300215U

CN215300215U - Circuit with high-efficient pulse control function

Info

Publication number: CN215300215U
Application number: CN202121358966.4U
Authority: CN
Inventors: 蔡诚; 李汉林; 孟庆国; 尹骞; 苏振东
Original assignee: Wuhan Lishen Power Cell System Technology Co ltd
Current assignee: Wuhan Lishen Power Cell System Technology Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-12-24
Anticipated expiration: 2031-06-18

Abstract

The utility model discloses a circuit with high-efficiency pulse control function, wherein one end of resistors R1, R2 and R3 is used as a direct current voltage input end VDD-IN and is connected with the voltage output end of an AC-DC voltage transformation module IN an external charger; the resistor R3 is respectively connected with the cathode of the diode D1, the cathode of D2, the cathode K of the reference voltage source DZ1 and one end of the resistor R4; a collector E of the switching tube Q1 is used as a direct-current voltage input end VDD-OUT and is connected with a power supply input end of an MCU in an external charger; an emitter C of the switching tube Q2 is respectively connected with the anode A of the DZ1, one end of a capacitor C1 and one end of a resistor R7; the reference pole R of the DZ1 is respectively connected with a resistor R5 and a resistor R7; resistor R5 is connected to the positive terminal of the battery pack. The utility model discloses can cut off the high-voltage pulse that outside charger brought for the BMS protection shield high-efficiently, prolong the life of BMS protection shield.

Description

Circuit with high-efficient pulse control function

Technical Field

The utility model relates to a lithium ion power battery's battery management system and the technical field that charges especially relate to a circuit with high-efficient pulse control function.

Background

At present, the application scale of lithium ion battery packs is getting larger and larger, people using new energy sharing single vehicles are getting more and more, meanwhile, the characteristics of high price and incapability of abuse of the lithium ion batteries and the characteristics of insecurity and the like of the lithium ion batteries essentially need to have a specialized Battery Management System (BMS) and a specialized charging management system to integrate and manage the lithium batteries, and the best performance of the lithium ion battery packs is ensured to be exerted to the maximum extent.

Lithium ion battery group charger on the market, the variety is various, and these chargers can bring malicious impact (be high-voltage pulse impact) for Battery Management System (BMS), directly make the new forms of energy sharing bicycle of installing lithium ion battery group, appear short-circuit protection suddenly in the use and report an emergency and ask for help or increased vigilance, battery management system abnormal alarm scheduling problem, cause the user of many new forms of energy sharing bicycle to feel very vexed, influence user's product and use and experience.

Therefore, there is an urgent need to develop a technology capable of solving the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a circuit with high-efficient pulse control function to the technical defect that prior art exists.

Therefore, the utility model provides a circuit with high-efficient pulse control function, it includes resistance R1 ~ R7, switch triode Q1, switch triode Q2, diode D1, diode D2, three-terminal adjustable reposition of redundant personnel reference voltage source DZ1 and electric capacity C1;

wherein, one end of the resistors R1, R2 and R3 is intersected at the terminal M;

the terminal M is used as a direct-current voltage input end VDD-IN and is connected with a voltage output end of an AC-DC voltage transformation module IN the existing sharing single-vehicle charger positioned outside;

the other end of the resistor R1 is connected with an emitter C of a switching triode Q1;

the other end of the resistor R2 is respectively connected with a base B of a switching triode Q1 and a collector E of a switching triode Q2;

the other end of the resistor R3 is respectively connected with the cathode of the diode D1, the cathode of the diode D2, the cathode K of the three-end adjustable shunt reference voltage source DZ1 and one end of the resistor R4;

a collector E of the switching triode Q1 is used as a direct-current voltage output end VDD-OUT and is connected with a power supply input end of a main control chip MCU in the existing shared single-vehicle charger positioned outside;

the other end of the resistor R4 is connected with a base B of a switching triode Q2;

an emitter C of the switching triode Q2 is respectively connected with the anode A of the three-end adjustable shunt reference voltage source DZ1, one end of the capacitor C1 and one end of the resistor R7;

the three-terminal adjustable shunt reference voltage source is connected with the anode A of the three-terminal adjustable shunt reference voltage source, one terminal of the capacitor C1 and one terminal of the resistor R7 in a grounding mode after the confluence is crossed;

wherein, the anode of the diode D1 and the anode of the diode D2 are connected with one end of the resistor R6 after the confluence is crossed;

the other end of the resistor R6 is connected with the other end of the capacitor C1;

a reference pole R of a three-terminal adjustable shunt reference voltage source DZ1 is respectively connected with one end of a resistor R5 and the other end of a resistor R7;

the other end of the resistor R5 is connected with the positive terminal BAT + of the battery pack;

and the negative electrode terminal BAT-of the battery pack is grounded.

Preferably, the resistances of the resistors R1, R2, R3 and R4 are 1K Ω, 3.3K Ω and 100 Ω, respectively;

the resistances of the resistors R5, R6, and R7 are 30K Ω, 5.1K Ω, and 1K Ω, respectively.

Preferably, the switching transistor Q1 is an NPN-type switching transistor;

the switching transistor Q2 is a PNP switching transistor.

Preferably, a first test point TP1 is arranged on a connection line between the terminal M and a voltage output end of an AC-DC voltage transformation module in an external existing shared single-vehicle charger;

a second test point TP2 is arranged on a connecting line between a collector electrode E of the switching triode Q1 and a power supply input end of a main control chip MCU in the existing shared single-vehicle charger positioned outside;

a third test point TP3 is arranged on a connecting circuit between the resistor R5 and the positive terminal BAT + of the battery pack;

and a fourth test point TP4 is arranged on a connecting circuit between the anode A of the three-end adjustable shunt reference voltage source and one end of the capacitor C1.

By the above the technical scheme provided by the utility model it is visible, compare with prior art, the utility model provides a circuit with high-efficient pulse control function, its design science can cut off the high-voltage pulse that charging end (for example outside charger) brought for the BMS protection shield high-efficiently to can protect lithium ion cell and prolong the life of BMS protection shield better, can carry out full functional real-time protection to the battery management system BMS that is used for managing lithium ion battery group on the new forms of energy sharing bicycle, can ensure that the new forms of energy sharing bicycle can not receive high-voltage pulse to strike and various unusual warnings appear because of new forms of energy sharing bicycle in the use, with the normal trip of the user of new forms of energy sharing bicycle, have the production practice meaning of great.

The utility model provides a circuit with high-efficient pulse control function does not need any software to control, when the end that charges has the high-voltage pulse input, can automatic cutout input high-voltage pulse, is a pure hardware protection circuit, has practiced thrift prior art effectively because the software detects the time that required cost, protection system safety that can be better.

Drawings

Fig. 1 is an electrical schematic diagram of a circuit with a high-efficiency pulse control function according to the present invention.

Detailed Description

In order to make the technical means of the present invention easier to understand, the present application will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.

Referring to fig. 1, the utility model provides a circuit with high-efficient pulse control function, including resistance R1 ~ R7, switching triode Q1, switching triode Q2, diode D1, diode D2, three-terminal adjustable reposition of redundant personnel reference voltage source DZ1 and electric capacity C1;

a terminal M serving as a DC voltage input terminal VDD-IN connected to a voltage output terminal (e.g., 12V voltage output) of an AC-DC transforming module IN an external existing shared single-vehicle charger;

note that, an AC-DC (alternating current-direct current) transformation module, which is originally provided in the charger, can convert an externally input alternating current 220V voltage into a direct current voltage of 12V, and supply the voltage to a main control chip MCU in the charger.

it should be noted that, the existing shared single-vehicle charger may specifically adopt a 17-string ternary charger dedicated to a lithium battery, which is produced by xuan Youtou electronics ltd and is applied to a rental battery. The utility model discloses a control module circuit application is in main chip control circuit, when pulse voltage is too high the utility model discloses a control module circuit can directly cut off the return circuit of charger, avoids the charger to export the load (for example including the BMS protection shield in battery package and the battery package).

and the negative electrode terminal BAT-of the battery pack is grounded.

During charging, the positive and negative output terminals of the external existing battery charger (i.e., the shared-vehicle charger) are respectively connected to the positive and negative terminals of the battery pack (i.e., the new-energy shared vehicle).

In the present invention, in particular, the resistances of the resistors R1, R2, R3 and R4 may be 1K Ω, 3.3K Ω and 100 Ω, respectively;

the resistances of the resistors R5, R6, and R7 may be 30K Ω, 5.1K Ω, and 1K Ω, respectively.

The utility model discloses in, on specifically realizing, the adjustable reposition of redundant personnel reference voltage source DZ1 of three-terminal can be RL431 AIDBZ's the adjustable reposition of redundant personnel reference voltage source of three-terminal for the model, is an adjustable reposition of redundant personnel reference voltage source of three-terminal that has good thermal stability ability.

In the present invention, in the specific implementation, the diode D1 and the diode D2 may be switch diodes of which the model is BAC70 LT.

In the present invention, in a specific implementation, the switching transistor Q1 is an NPN switching transistor, for example, a switching transistor of SMMBT5551LT 1G;

the switching transistor Q2 is a PNP switching transistor, and may be, for example, a switching transistor of the type SMMBT5401LT 1G.

In the present invention, in particular, a first test point TP1 is provided on a connection line between the end point M and a voltage output terminal (e.g., 12V voltage output) of an AC-DC voltage transformation module in an external existing shared single-vehicle charger;

It should be noted that the test points TP1, TP2, TP3, and TP4 are also check points. Is the point in the circuit where the circuit state is verified or where the test signal is injected.

It should be noted that, at the front end (i.e. the charging device end) of the existing charging management system (i.e. the charging management circuit of BMS), the circuit of the present invention is a charging pulse control module. When opening the outside battery charging outfit (being the charger) of having connected the battery package system, start the mode of charging, at this time, the pulse control module that charges starts automatically, according to switching power supply characteristic, can appear great impulse voltage at the end of charging, at whole in-process, the utility model provides a charge pulse module real time management and control the terminal impulse voltage value of charging, when impulse voltage value surpassed the default (for example 77.5V) in the pulse module that charges, the automatic current state of charge that cuts off stops to let outside battery charging outfit (being the charger) carry out the high-voltage pulse impact to BMS battery management system to the normal operating of protection BMS battery management system and the performance of new energy sharing bicycle.

Therefore, the utility model discloses a circuit is as a pulse control module circuit that charges, through increasing this pulse control module circuit that charges, can the control system pulse, protection BMS management system and life-span finally improve the whole security performance of new forms of energy sharing bicycle.

In order to understand the technical solution of the present invention more clearly, the following describes the operation principle of the present invention for controlling the input high voltage pulse.

The working principle is as follows: at the beginning, 220V AC is connected to the original battery charger (i.e. sharing single-vehicle charger), the positive output terminal BAT + and the negative output terminal BAT- (GND) of the battery charger are respectively connected to the two ends of the battery pack (the positive end and the negative end of the battery pack, i.e. the positive end and the negative end of the BMS protection board in the battery pack), after the charger is started, the pulse control module circuit of the present invention starts to work, according to the characteristic of the TL431 chip adopted by the three-terminal adjustable shunt reference voltage source DZ1, when the voltage at the driving end (i.e. the R end in fig. 1) is greater than 2.5V, the voltage at the output end (i.e. the K end in the figure) of the TL431 chip will be pulled down, according to the characteristic of the triode, when the voltage at the B end in the triode Q2 is pulled down, the PN junction of the triode is conducted forward, and simultaneously the voltage at the E end in the triode Q2 is pulled down synchronously, and the voltage at the B level in the triode Q1 is also pulled down, triode Q1 can't switch on this moment, has cut off the voltage between VDD-IN and VDD-OUT IN the return circuit promptly, and the main control chip MCU IN the shared bicycle charger cuts off the power supply, and the charger can't normally work this moment to can't give the positive terminal and the negative pole end output voltage of battery package (can't give the battery management system BMS protection shield output voltage IN the battery package promptly), thereby reach the purpose of protection battery management system BMS protection shield. According to the characteristics of the TL431 chip, when the voltage at the driving terminal (i.e., the R terminal in the drawing) is < 2.5V, the battery management system BMS protection board can perform a normal charging operation.

With respect to the preset values: according to the characteristics of the TL431 chip, when the voltage of a driving end (namely, an end R in fig. 1) is 2.5V, a circuit reaches a critical value, according to the BMS withstand voltage condition, by adjusting a D2 withstand voltage value and the resistance value of R5/R7, if R5 is 30K, R7 and is 1K in fig. 1, BAT is converted to 2.5 × 31V and 77.5V, namely when the pulse voltage of a load end provided by an external charger exceeds 77.5V, the pulse circuit automatically cuts off a loop, and the battery pack as a load end and the BMS in the battery pack are stopped from being charged; when the load pulse voltage provided by the external charger is less than 77.5V, the charger operates normally, and the battery pack as a load terminal and the BMS in the battery pack are charged normally.

The utility model discloses a function integrated level is high, the design is succinct reasonable, has fine reliability and manufacturability simultaneously. Through increasing the pulse control module that charges, prolong BMS life, improve the security performance of new forms of energy sharing bicycle to rationally arrange the trip.

To sum up, compared with the prior art, the utility model provides a pair of circuit with high-efficient pulse control function, its design science can cut off the high-voltage pulse that charging end (for example outside charger) brought for the BMS protection shield high-efficiently, thereby can protect lithium ion battery core and prolong the life of BMS protection shield better, can carry out full functional real-time protection to the battery management system BMS that is used for managing lithium ion battery group on the new forms of energy sharing bicycle, can ensure that the new forms of energy sharing bicycle can not receive high-voltage pulse to strike and various unusual warnings appear because of new forms of energy sharing bicycle in the use, with make things convenient for new forms of energy sharing bicycle user to normally trip, have the production practice meaning of great.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A circuit with a high-efficiency pulse control function is characterized by comprising resistors R1-R7, a switching triode Q1, a switching triode Q2, a diode D1, a diode D2, a three-end adjustable shunt reference voltage source DZ1 and a capacitor C1;

and the negative electrode terminal BAT-of the battery pack is grounded.

2. The circuit with high-efficiency pulse control function according to claim 1, wherein the resistances of the resistors R1, R2, R3 and R4 are 1K Ω, 3.3K Ω and 100 Ω, respectively;

3. The circuit with high efficiency pulse control function as claimed in claim 1, wherein the switching transistor Q1 is an NPN type switching transistor;

the switching transistor Q2 is a PNP switching transistor.

4. A circuit with high-efficiency pulse control function as claimed in any one of claims 1 to 3, wherein a first test point TP1 is provided on a connection line between the terminal M and the voltage output terminal of the AC-DC voltage transformation module in the existing shared single-vehicle charger located outside;