voltage detection circuit

A technology of voltage detection circuit and circuit, which is applied in the direction of electronic circuit test, current/voltage measurement, non-contact circuit test, etc. It can solve the problems of increasing cost and occupying a large layout area, so as to reduce quantity, reduce cost and save The effect of device area

Active Publication Date: 2011-12-21
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] If the two voltage detection circuits introduced above are used, taking the values ​​in the figure as an example, 19 NPN bipolar transistors are required, which takes up a considerable layout area and increases the cost

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Embodiment Construction

[0042] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] The term "one embodiment" or "embodiment" here refers to that specific features, structures or characteristics related to the embodiment can be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification do not necessarily all refer to the same embodiment, nor do they necessarily refer to a separate or selected embodiment that is mutually exclusive of other embodiments.

[0044] The present invention proposes a voltage detection circuit in a battery protection chip, which includes: a first bipolar transistor, a second bipolar transistor, a third bipolar transistor, a plurality of first switching devices and a plurality of second switches de...

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Abstract

The invention discloses a voltage detection circuit, comprising three bipolar transistors Q1, Q2 and Q3, a first switching device, a second switching device, a third switching device and a fourth switching device, wherein breakover and cut-off of the first switching device are reversed with the breakover and cut-off of the second switching device, the breakover and cut-off of the third switching device are reversed with the breakover and cut-off of the fourth switching device, the first switching device and the third switching device can not be in a breakover state simultaneously, when the first switching device is in the breakover state, an overvoltage voltage detection circuit is formed based on the three bipolar transistors Q1, Q2 and Q3; and when the third switching device is in the breakover state, an overcurrent voltage detection circuit is formed based on the three bipolar transistors Q1, Q2 and Q3. The bipolar transistor occupying larger chip area can be multiplexed in a time-sharing manner by virtue of a transfer switch, quantity of NPN transistors is reduced, area of the devices is effectively saved, and cost is reduced.

Description

【Technical field】 [0001] The invention relates to the field of integrated circuits, in particular to a voltage detection circuit in a battery protection chip. 【Background technique】 [0002] Usually each battery protection chip includes three voltage detection circuits, a short circuit detection circuit, a reference voltage source, an oscillator and a logic control circuit. One implementation method is that the circuit works in scan mode, the oscillator is always working, and the system detects various abnormal working states (for example, overcharged state, overdischarged state, overcurrent state, etc.) in sequence. [0003] For the overcharge voltage detection and overdischarge voltage detection in the voltage detection circuit, a bandgap reference voltage based on about 1.2V is usually used for detection. Please refer to figure 1 As shown, it shows a schematic circuit diagram of an overcharge voltage detection circuit or an overdischarge voltage detection circuit (which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165G01R31/28G01R31/303
Inventor 田文博王钊李展
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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