Charge protection circuit for capacitor step-down

A charging protection and capacitor step-down technology, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve the problems of battery damage, easy overcharging, and no cost advantage, so as to prolong service life, improve product performance, reduce The effect of material cost
CN104617626BInactive Publication Date: 2017-05-17怀化市红圳电子科技有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
怀化市红圳电子科技有限责任公司
Publication Date
2017-05-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A charging protective circuit is provided with a reverse switching circuit, a battery overcharging detection circuit, and a battery overcharging shunt circuit between a power supply input end and a battery charging circuit. When a rechargeable battery is charged completely, that is, a set charge capacity upper limit is reached, the charging protective circuit can guide a power supply current to another function device circuit disposed on the circuit, for example, an LED display light, a heater, a small motor, or a small device with some functions, so that a voltage of the rechargeable battery during charging is lower than or equal to a set value, it is ensured that a phenomenon of overcharging of the rechargeable battery does not occur, the rechargeable battery is effectively protected, and the service life of the rechargeable battery is greatly prolonged. The charging protective circuit is simple in structure, and uses only a dozen of small power components, so that product performance is improved, and material costs can also be effectively reduced.
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Description

technical field

[0001] The invention relates to a charging protection circuit, in particular to an overcharge protection circuit adopting a capacitor step-down charging circuit. Background technique

[0002] The conventional way to convert AC power to low-voltage DC is to use a transformer to step down and then rectify and filter. When limited by factors such as size and cost, the simplest and most practical method is to use a capacitor step-down power supply.

[0003] In the prior art, small household appliances that use capacitor step-down charging, such as flashlights, card speakers, Bluetooth speakers, radios, etc., all use overcharge-resistant lead-acid batteries or nickel-cadmium batteries, basically without charging protection circuits. Capacitor step-down charging uses a common battery charging protection circuit, and a high-power voltage stabilizing device must be added. There is following deficiency in above-mentioned structure:

[0004] 1) The overcharge-resista...

Claims

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