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Time-delay adjustable circuit and lithium battery protection circuit thereof

A delay circuit and circuit technology, applied in battery overcurrent protection, safety/protection circuits, emergency protection circuit devices, etc., can solve problems such as switch tube burnout, lithium battery protection chip function failure, switch tube mistakenly turned off, etc.

Active Publication Date: 2021-06-08
SUZHOU XYSEMI ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the fixed delay is used, after the short-circuit current is exceeded, the protection time of different short-circuit currents is the same. If a shorter protection delay is selected, the short-circuit protection function is easily triggered when the system is working, causing the switch to be turned off by mistake. , if a longer protection delay is selected, it is easy to accumulate energy during a large short-circuit current and cause the switch tube to burn out, resulting in the failure of the lithium battery protection chip function, and in severe cases, battery damage

Method used

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  • Time-delay adjustable circuit and lithium battery protection circuit thereof
  • Time-delay adjustable circuit and lithium battery protection circuit thereof
  • Time-delay adjustable circuit and lithium battery protection circuit thereof

Examples

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Embodiment 1

[0036] Such as image 3 As shown, the present application provides a delay adjustable circuit including a voltage controlled oscillator circuit 14, a reference circuit 11, a short circuit detecting circuit 12, a delay circuit 13, and a switch tube 15, wherein:

[0037] The reference circuit 11 is configured to generate a reference voltage source and a current source in which the chip does not change with the voltage, and the first input of the reference circuit 11 connects the VDD end, the second input terminal of the reference circuit 11 connects the second end, the reference circuit. 11 The output of the output is connected to the second input of the short circuit detecting circuit 12.

[0038] The short circuit detecting circuit 12 is configured to detect whether the current of the switch tube 15 exceeds the set current value, and the output of the short-circuit detecting circuit 12 connects the first input of the delay circuit 13.

[0039] The delay circuit 13 is configured to ...

Embodiment 2

[0053] Such as figure 2 As shown, the difference between the present embodiment and the first embodiment is that the present application also provides an improvement scheme of the voltage controlled oscillator circuit 14, wherein the voltage control current source circuit 141 also includes eight MOS tubes M8 and Ninth MOS. The drain of the tube M9 and the eighth MOS tube M8 connects the drain of the third MOS tube M3, the gate of the eighth MOS tube M8 and the gate of the ninth MOS tube M9, the source connection of the eighth MOS tube M8 The input end of the current source IDC1 and the source of the ninth MOS tube M9.

[0054] Such as figure 2 As shown, when the current flowing through the switch tube 15 is small, the voltage of the VM end is about equal to the voltage of the ground terminal. At this time, the gate source voltage Vgs of the first MOS tube MOS M1 is large, and the current capacity of the first MOS tube M1 is large. Since the current capacity of the first current so...

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Abstract

The invention discloses a time-delay adjustable circuit and a lithium battery protection circuit thereof, the time-delay adjustable circuit comprises a voltage-controlled oscillator circuit, a reference circuit, a short-circuit detection circuit, a time-delay circuit and a switching tube, the reference circuit is used for generating a reference voltage source and a current source which do not change along with voltage in a chip; the short-circuit detection circuit is used for detecting whether current at two ends of the switch tube exceeds a set current value; the time-delay circuit is used for setting the time delay of the short-circuit detection circuit; the switching tube is used for controlling on or off of the charging and discharging path; and the voltage-controlled oscillator circuit is used for controlling the time delay of the oscillator through the voltage of a VM end. By controlling the charging and discharging speed and time of a second capacitor or a third capacitor, the protection time delay is reduced when the short-circuit current is large, the damage of energy accumulation to the switching tube is reduced, the protection time delay is increased when the short-circuit current is small, the switching tube is prevented from being turned off due to false triggering, and the stability and reliability of the lithium battery protection circuit are protected.

Description

Technical field [0001] The present invention relates to the field of lithium battery protection, and more particularly to a delay adjustable circuit and a lithium battery protection circuit thereof. Background technique [0002] Since the capacity of lithium batteries is increasing, as well as high-magnification lithium batteries, especially in smartphones, mobile power supplies, the battery has a capacity of several thousand MAH, or even tens of thousands of MAH. [0003] In the prior art, when a lithium battery is short-circuited, the short-circuit current can reach tens of A or even hundreds A, and the current lithium battery protection chip is to detect the short-circuit current of the lithium battery to reach or exceed the set value, and passed After the delay sets the corresponding delay circuit, the discharge path is turned off. Since the use of fixed delays, after the short-circuit current, different short-circuit current protection time is the same. If a shorter protecti...

Claims

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Application Information

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IPC IPC(8): H02H7/18H02J7/00
CPCH02H7/18H02J7/00304H02J7/00712
Inventor 蒋锦茂张以见
Owner SUZHOU XYSEMI ELECTRONICS TECH CO LTD