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Overvoltage protection system and method

A technology for overvoltage protection and chip protection, applied in battery overcurrent protection, safety/protection circuits, secondary battery repair/maintenance, etc., can solve problems such as lack of overvoltage protection, achieve protection, improve safety, current Reduced effect

Inactive Publication Date: 2017-03-08
DONGGUAN NVT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the prior art, there is a lack of a technical solution for overvoltage protection

Method used

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  • Overvoltage protection system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0050] figure 1 A schematic structural diagram of an embodiment of an overvoltage protection system provided for an embodiment of the present invention, such as figure 1 As shown, the overvoltage protection system of the embodiment of the present invention may include: a power supply, a battery, a first PTC (Positive Temperature Coefficient, positive temperature coefficient) thermistor PTC1, a first protection chip U1, a first MOS (Metal-Oxide- Semiconductor, metal-oxide-semiconductor) tube Q1.

[0051] Such as figure 1 As shown, the power supply includes the positive pole P+ of the power supply and the negative pole P- of the power supply. The power supply is used to provide electric energy for the battery when the battery needs to be charged. Contacts for connection to an external charger, can also represent a charger.

[0052] Such as figure 1 As shown, the PTC thermistor PTC1 has three connection terminals. In the embodiment of the present invention, the PTC thermistor...

Embodiment 2

[0067] figure 2 A schematic structural diagram of another embodiment of the overvoltage protection system provided by the embodiment of the present invention, as shown in figure 2 As shown, the overvoltage protection system provided by the embodiment of the present invention, in figure 1 On the basis of the structure shown, it may further include: a second protection chip U2, a second MOS transistor Q2, a third MOS transistor Q3, a third capacitor C3, a fifth resistor R5 and a sixth resistor R6.

[0068] Wherein, the second protection chip U2 includes: a second Vdd pin, a second Cout pin, a data output Dout pin, and a second V- pin;

[0069] One end of the fifth resistor R5 is connected to the positive pole of the battery, and the other end is respectively connected to the second Vdd pin and one end of the third capacitor C3;

[0070] The other end of the third capacitor C3 is connected to the source of the second MOS transistor Q2;

[0071] The other end of the third cap...

Embodiment 3

[0081] image 3 The flow chart of the embodiment of the overvoltage protection method provided by the embodiment of the present invention, such as image 3 As shown, the overvoltage protection method in the embodiment of the present invention can be applied to figure 1 or figure 2 In the overvoltage protection system shown in , it can specifically include the following steps:

[0082] 301. When the first protection chip detects that the battery is in a charging state, the first protection chip detects the voltage of the battery.

[0083] 302. If the first protection chip detects that the voltage of the battery is greater than the battery voltage threshold, the first protection chip sends a voltage signal to the MOS transistor.

[0084] 303. The MOS tube is turned on according to the voltage signal, so that the internal resistance of the PTC thermistor increases according to the voltage of the battery and the ground voltage after the MOS tube is turned on, and reduces the c...

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Abstract

The present invention provides an overvoltage protection system and method. The overvoltage protection system provided by the embodiments of the invention comprises a power source, a battery and a first (positive temperature coefficient) PTC thermistor; the negative pole of the battery is connected with the negative pole of the power source; the first end of the PTC thermistor is connected with the positive pole of the power source; the second end of the PTC thermistorr is connected with the positive pole of the battery; and the third end of the PTC thermistor is grounded. According to the overvoltage protection system and method provided by the technical schemes of the invention, when the system detects that voltage received by the battery exceeds voltage which can be withstood by the battery, a circuit in the overvoltage protection system is switched on and begins to work, and therefore, the resistance value of the PTC thermistor in the circuit is increased, and current in the circuit can be decreased greatly, and therefore, the battery can be protected, and the security of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an overvoltage protection system and method. Background technique [0002] At this stage, there are more and more products that use electric energy as a power source, such as terminals and electric vehicles. Advances in technology have diversified the functions of products and increased power consumption. Since the rated capacity of the battery is fixed, the frequency of charging the battery will also increase accordingly. Therefore, increasing the charging speed becomes a problem that needs to be solved. [0003] There are many ways to increase the charging speed, for example, increasing the charging current, increasing the charging voltage, and so on. When a large charging current or charging voltage is used to charge the battery, when an external charger is used to input electric energy, the temperature of the battery will rise. When the temperature of the battery exceeds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/443H02J7/0029H02J7/00304H02J7/0036Y02E60/10
Inventor 黄俭善卓加杰陈光辉
Owner DONGGUAN NVT TECH
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