WO2019085233A1

WO2019085233A1 - Power supply device and battery protection circuit thereof

Info

Publication number: WO2019085233A1
Application number: PCT/CN2017/118643
Authority: WO
Inventors: 罗剑锋; 黄嘉曦; 江旭峰; 潘江洪
Original assignee: 深圳易马达科技有限公司
Priority date: 2017-10-31
Filing date: 2017-12-26
Publication date: 2019-05-09
Also published as: CN207475228U

Abstract

The present application relates to the field of battery protection, and provides a power supply device and a battery protection circuit (10) thereof. The battery protection circuit is connected to a battery (20) and comprises a main control module (110), a current limiting module (120), and a charge and discharge control module (130); an output end of the main control module is separately connected to an input end of the current limiting module and a control end of the charge and discharge control module; the output end of the current limiting module is connected to the output end of the charge and discharge control module; the output end of the charge and discharge control module is connected to the battery. When the battery enables a discharging function, the main control module firstly limits an output current of the battery by means of the current limiting module, and after certain delay duration, the main control module drives the charge and discharge control module to enable the charge and discharge control module to control the battery to carry out a discharging operation. Therefore, a power-on current of the charge and discharge control module is effectively controlled, and thus power devices in the circuit are protected from being damaged; the problem that the power devices are damaged due to the fact that an output voltage of an existing power battery is overlarge is resolved.

Description

Power supply device and battery protection circuit thereof

Technical field

The utility model belongs to the technical field of batteries, in particular to a power supply device and a battery protection circuit thereof.

Background technique

A power battery is a power source that powers a tool, such as a battery that powers an electric car, an electric train, or an electric bicycle. With the popularity of power batteries, the safety of power batteries has also received more and more attention. Since the output voltage of the power battery is high, the opening current of the power device of the battery charge and discharge control circuit is too large, which may cause damage to the power device in the charge and discharge control circuit and damage to the peripheral circuit.

In summary, the existing power battery has a problem that the power device is damaged due to a large output voltage.

technical problem

In order to solve the problem that the existing power battery has a large output voltage and the power device is damaged, the embodiment of the present invention provides a power supply device and a battery protection circuit thereof.

Technical solution

The utility model provides a battery protection circuit, which is connected to a battery, and the battery protection circuit comprises a main control module, a current limiting module and a charging and discharging control module;

An output end of the main control module is respectively connected to an input end of the current limiting module and a control end of the charging and discharging control module, and an output end of the current limiting module is connected to an output end of the charging and discharging control module, An output end of the charge and discharge control module is connected to the battery;

The main control module outputs a current limiting control signal to the current limiting module when the battery is turned on, and outputs an opening signal to the charging and discharging control module after a preset period of time;

The current limiting module limits current output current of the battery when receiving the current limiting control signal;

The charge and discharge control module outputs a start control signal to control the battery to perform a discharge operation upon receiving the turn-on signal.

Another aspect of the present invention provides a power supply device including a battery and the battery protection circuit connected to the battery.

Beneficial effect

The power supply device and the battery protection device provided by the utility model, when the battery is turned on and off, the main control module first limits the output voltage of the battery through the current limiting module, and after a certain time delay, the main control module drives the charging and discharging control. The module enables the charging and discharging control module to control the battery to perform the discharging operation, and the opening current of the charging and discharging control module is effectively controlled, thereby protecting the power device in the circuit from being damaged, thereby effectively solving the problem that the existing power battery has a large output voltage. Causes damage to the power device.

DRAWINGS

1 is a block diagram of a battery protection circuit according to an embodiment of the present invention;

2 is a block diagram of a battery protection circuit according to another embodiment of the present invention;

3 is a circuit structural diagram of a battery protection circuit according to a first embodiment of the present invention.

Embodiments of the invention

In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It is to be understood that the term "comprise" and variations of the invention in the specification and claims of the invention are intended to cover a non-exclusive inclusion. For example, a process, method or system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units not listed, or alternatively also includes Other steps or units inherent to these processes, methods, products or equipment. Moreover, the terms "first," "second," and "third," etc. are used to distinguish different objects and are not intended to describe a particular order.

In order to solve the problem that the existing power battery has a large output voltage and cause the power device to be damaged, the present invention provides a power supply device and a battery protection device thereof. When the battery is turned on, the main control module first passes the current limiting. The module limits the output current of the battery. After a certain time delay, the main control module drives the charge and discharge control module to enable the charge and discharge control module to control the battery for discharge operation, and the opening current of the charge and discharge control module is effectively controlled, thereby protecting The power device in the circuit is not damaged, effectively solving the problem that the existing power battery has a large output voltage and the power device is damaged. In order to explain the technical solutions described in the present invention, the following description will be made by way of specific embodiments.

FIG. 1 shows the structure of the battery protection circuit 10 provided in this embodiment. As shown in FIG. 1 , the battery protection circuit 10 is connected to the battery 20 and includes a main control module 110 , a current limiting module 120 , and a charging and discharging control module 130 .

The output end of the main control module 110 is respectively connected to the input end of the current limiting module 120 and the control end of the charging and discharging control module 130. The output end of the current limiting module 120 is connected to the output end of the charging and discharging control module 130, and the charging and discharging control module 130 The output is connected to the battery 20.

The main control module 110 outputs a current limiting control signal to the current limiting module 120 when the battery is turned on and off, and outputs an opening signal to the charging and discharging control module 130 after a preset period of time elapses.

The current limiting module 120 limits the output current of the battery 20 when receiving the current limiting control signal.

The charge and discharge control module 130 outputs a start control signal to control the battery 20 to perform a discharge operation upon receiving the turn-on signal.

In one embodiment, as shown in FIG. 2, the battery protection circuit further includes a detection module 240.

The output end of the detecting module 240 is connected to the input end of the main control module 110. The detecting module 140 detects whether the battery is turned on or off, and outputs a detection signal to the main control module when the battery is turned on and off. In a specific application, when the detecting module 240 detects the battery opening and discharging function, it outputs a detection signal, and the detecting module may include a detecting component capable of detecting whether the battery is turned on or off.

In another embodiment, as shown in FIG. 2, the battery protection circuit 10 further includes a driving module 250.

The driving module 250 is connected between the main control module 110 and the current limiting module 120.

The driving module 250 drives the current limiting module 120 to operate according to the current limiting control signal.

In a specific application, the driving module 250 includes a driving chip. When the main control module outputs a current limiting control signal, the driving module 250 drives the current limiting module 120 to limit the output current of the battery according to the current limiting control signal. After the preset period of time, the charge and discharge control module 130 is driven to prevent the on-current of the charge and discharge control module 130 from exceeding the preset safety current, thereby causing damage to the power device.

It should be noted that the foregoing preset time period refers to a time required by the current limiting module 120 to limit the output current after a period of time, and then the main control module outputs an open signal to the charging and discharging control module.

FIG. 3 shows a circuit structure of a battery protection circuit according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are shown, which are described in detail as follows:

As shown in FIG. 3, as an embodiment of the present invention, the current limiting module 120 includes a first switching transistor Q1, a first resistor R1, and a first diode D1.

The controlled end of the first switch Q1 is the input end of the current limiting module 120. The first end of the first switch Q1 and the positive end of the first diode D1 together form an output end of the current limiting module 120. The first switch tube The second end of Q1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the cathode of the first diode D1.

In a specific application, the first switching transistor Q1 is the first NMOS transistor Q1; the source of the first NMOS transistor Q1 is the first end of the first switching transistor Q1, and the gate of the first NMOS transistor Q1 is the first switching transistor Q1. The controlled end, the drain of the first NMOS transistor Q1 is the second end of the first switching transistor Q1.

In one embodiment, the charge and discharge control module 140 includes a feedback controller AFE, a second resistor R2, a third resistor R3, a second switch transistor Q2, and a third switch transistor Q3.

The input end of the feedback controller AFE is the input end of the charge and discharge control module 140, the first output end of the feedback controller AFE is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the second switch tube The controlled end of the Q2 is connected. The second end of the third switch Q3 is the output end P- of the charge and discharge control module 140, and the second end of the second switch Q2 is connected to the first end of the third switch Q3. The second output of the controller AFE is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the controlled end of the third switch Q3.

In a specific application, the second switching transistor Q2 is the first NMOS transistor Q2, the source of the first NMOS transistor Q2 is the first end of the second switching transistor Q2, and the gate of the first NMOS transistor Q2 is the second switching transistor Q2. The controlled end, the drain of the first NMOS transistor Q2 is the second end of the second switching transistor Q2.

In a specific application, the third switch transistor Q3 is the second NMOS transistor Q3, the drain of the second NOMS transistor Q3 is the first end of the third switch transistor Q3, and the gate of the second NMOS transistor Q3 is the third switch transistor Q3. The terminal of the second NMOS transistor Q3 is the second end of the third switching transistor Q3.

In a specific application, the first end of the second switch tube Q2 is connected to the battery core of the battery 20, and the second end of the third switch tube Q3 is connected to the negative electrode of the protection board of the battery 20.

The working principle of the battery protection circuit provided by this embodiment is described below with reference to FIG. 3:

When the battery is activated, the charge and discharge function is activated. The main control module outputs a current limiting control signal to the driving module, and the driving chip of the driving module drives the first switching tube Q1 of the current limiting module to be turned on, thereby limiting the output current of the battery, and in specific applications, limiting the opening current The size is determined by the first resistor R1. After maintaining the certain time, the main control module controls the feedback controller AFE to operate by the turn-on signal, thereby driving the second switch transistor Q2 and the third switch transistor Q3 to be turned on, thereby controlling the battery 20 to be performed. Discharge operation. First, the current limiting current of the battery is limited by driving the current limiting module, and then the second switching tube Q2 and the third switching tube Q3 of the charging and discharging control module are further driven to prevent the opening current of the second switching tube Q2 and the third switching tube Q3. The power device is damaged due to exceeding the preset safe current.

The embodiment further provides a power supply device including a battery and the battery protection circuit connected to the battery.

The utility model provides a power supply device and a battery protection device. When the battery is turned on and off, the main control module first limits the output of the battery through the current limiting module. After a certain time delay, the main control module re- The charging and discharging control module is driven to enable the charging and discharging control module to control the battery to perform the discharging operation, and the opening current of the charging and discharging control module is effectively controlled, thereby protecting the power device in the circuit from being damaged, thereby effectively solving the existence of the existing power battery. A large output voltage causes damage to the power device.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the present invention. The scope of protection of utility models.

Claims

A battery protection circuit is connected to a battery, wherein the battery protection circuit comprises a main control module, a current limiting module, and a charging and discharging control module;

An output end of the main control module is respectively connected to an input end of the current limiting module and a control end of the charging and discharging control module, and an output end of the current limiting module is connected to an output end of the charging and discharging control module, An output end of the charge and discharge control module is connected to the battery;

The main control module outputs a current limiting control signal to the current limiting module when the battery is turned on, and outputs an opening signal to the charging and discharging control module after a preset period of time;

The current limiting module limits current output current of the battery when receiving the current limiting control signal;

The charge and discharge control module outputs a start control signal to control the battery to perform a discharge operation upon receiving the turn-on signal.
The battery protection circuit according to claim 1, wherein the battery protection circuit further comprises a detection module;

The output end of the detecting module is connected to the input end of the main control module;

The detecting module detects whether the battery is turned on or off, and outputs a detection signal to the main control module when detecting that the battery is turned on and off.
The battery protection circuit according to claim 1, wherein the battery protection circuit further comprises a driving module;

The driving module is connected between the main control module and the current limiting module;

The driving module drives the current limiting module to operate according to the current limiting control signal.
The battery protection circuit of claim 1 , wherein the current limiting module comprises a first switching transistor, a first resistor, and a first diode;

The controlled end of the first switch tube is an input end of the current limiting module, and the first end of the first switch tube and the positive pole of the first diode together form an output end of the current limiting module The second end of the first switch is connected to the first end of the first resistor, and the second end of the first resistor is connected to the negative end of the first diode.
The battery protection circuit according to claim 4, wherein the first switching transistor is a first NMOS transistor;

a source of the first NMOS transistor is a first end of the first switching transistor, a gate of the first NMOS transistor is a controlled end of the first switching transistor, and a drain of the first NMOS transistor is a The second end of the first switch tube is described.
The battery protection circuit according to claim 1, wherein the charge and discharge control module comprises: a feedback controller, a second resistor, a third resistor, a second switch transistor, and a third switch transistor;

An input end of the feedback controller is an input end of the charge and discharge control module, a first output end of the feedback controller is connected to a first end of the second resistor, and a second end of the second resistor Connected to the controlled end of the second switch tube, the second end of the third switch tube is an output end of the charge and discharge control module, and the second end of the second switch tube is opposite to the third switch a first end of the tube is connected, a second output of the feedback controller is coupled to the first end of the third resistor, and a second end of the third resistor is coupled to the controlled end of the third switch .
The battery protection circuit according to claim 6, wherein the second switching transistor is a first NMOS transistor;

a source of the first NMOS transistor is a first end of the second switching transistor, a gate of the first NMOS transistor is a controlled end of the second switching transistor, and a drain of the first NMOS transistor is a The second end of the second switch tube is described.
The battery protection circuit according to claim 6, wherein the third switching transistor is a second NMOS transistor;

The drain of the second NOMS tube is the first end of the third switch tube, the gate of the second NMOS tube is the controlled end of the third switch tube, and the source of the second NMOS tube is extremely The second end of the third switch tube.
A power supply device, comprising: a battery; and the battery protection circuit according to any one of claims 1 to 8 connected to the battery.