Self-recovery protection circuit and over-discharge protection circuit
A protection circuit and self-recovery technology, applied in the direction of battery over-discharge protection, safety/protection battery circuit, safety/protection circuit, etc., can solve problems such as power consumption, lithium battery over-discharge, low chip, etc., and achieve the goal of ensuring stable reduction Effect
Pending Publication Date: 2018-02-23
FUJIAN FUXIN ELECTRONICS TECH CO LTD
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Problems solved by technology
The hazards of the above phenomenon are: 1. The lithium battery will continuously discharge the load and consume power. When the VDR value of the lithium battery protection IC is set low, it may even cause damage to the lithium battery caused by over-discharge.
2. Short-term continuous and frequent switching actions of the power MOS tube will cause the device to heat up and affect its performance
3. After the battery cannot be self-recovery due to continuous discharge, the chip will continue to consume battery power, because the self-recovery lithium battery protection IC generally needs to start the sleep mode when the battery power drops to about 2V, which is far lower than the VDL value of the chip
Method used
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[0029] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.
[0030] This paper proposes an innovative self-recovery protection circuit, its specific structure is as follows Figure 4 As shown, it includes enable input terminal EN, discharge input terminal OD, charge pump circuit, comparator 3, and output voltage terminal Vout;
[0031] The enable input terminal EN is used to receive the enable signal; the discharge input terminal OD is used to receive the output signal of the discharge control pin of the over-discharge protection control circuit; the charge pump includes a charge pump switch circuit and a charge-discharge capacitor, The enable input terminal is connected to the charge pump switch circuit, the discharge input terminal is connected to the charge pump switch circuit, the charge pu...
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The invention discloses a self-recovery protection circuit and an over-discharge protection circuit. The circuit comprises an enable input end, a discharge input end, a charge pump, a comparer and anoutput voltage end, wherein the enable input end is used for receiving an enable signal; the discharge input end is used for receiving an output signal for discharge control pins of the over-dischargeprotection circuit; the charge pump comprises a charge pump switching circuit and a charging and discharging capacitor, the enable input end is connected with the charge pump switching circuit, the discharge input end is connected with the charge pump switching circuit, the charge pump switching circuit is connected with the charging and discharging capacitor, the charging and discharging capacitor is further connected with an input end of the comparer, the other input end of the comparer is connected with reference voltage, and the output end of the comparer is connected with the output voltage end. The fluctuation of OD output pins is stabilized by designing the charge pump circuit, the stability for the output fluctuation of OD pins is achieved in the process of battery discharge untilthe voltage is insufficient, meaningless energy consumption is reduced, and a feedback signal Vout is cut after the voltage of battery discharge is insufficient, so that the effect of improving the safety of circuit design is reached.
Description
technical field [0001] The invention relates to the field of electronic circuit design, in particular to a novel self-recovery protection circuit and an over-discharge protection circuit using the self-recovery protection circuit. Background technique [0002] Lithium batteries have the advantages of small size, high energy density, no memory effect, high cycle life, high voltage battery and low self-discharge rate, so they are widely used in mobile phones, digital cameras, tablet computers and other electronic products. Unlike nickel-cadmium and nickel-metal hydride batteries, lithium batteries must consider the safety of charging and discharging to prevent deterioration of characteristics: when charging lithium batteries, the upper voltage limit must be set to take into account the life and capacity of the battery at the same time , and safety; and the lithium battery also has a lower voltage limit when it is discharged. When the battery voltage is too low, some materials ...
Claims
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Login to View More IPC IPC(8): H02J7/00H02H3/06
CPCH02J7/0026H02J2007/0067H02H3/066H02J7/0029H02J7/0063H02J7/00306
Inventor 陈崴陈然斌李云峰徐栋
Owner FUJIAN FUXIN ELECTRONICS TECH CO LTD