Lithium battery charging circuit and lamps
A charging circuit and lithium battery technology, applied in battery circuit devices, circuit devices, collectors, etc., can solve the problems of lamp charging dependence and charging inconvenience
Active Publication Date: 2019-07-02
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies in the prior art, and propose a lithium battery charging circuit and a lamp, which can solve the problem of inconvenient charging caused by excessive dependence on external chargers for lamp charging in the prior art
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[0016] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0017] Lithium battery charging circuit embodiment
[0018] see figure 1 , a lithium battery charging circuit, which includes: a first adjustable power supply, a first comparator U1A, a controlled switch Q3, a detection resistor RS1, a current limiting resistor R1, a switch module 1, a prompt module 2 and a power module 3.
[0019] The first adjustable power supply is used to provide an adjustable reference voltage. The out-of-phase terminal of the first comparator U1A is connected to the first adjustable power supply. The controlled switch Q3 includes a control terminal, a first switch terminal and a second switch terminal, and the control terminal of the controlled switch Q3 is connected to the output terminal of the first comparator U1A. The detection res...
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The invention provides a lithium battery charging circuit and a lamp. The lithium battery charging circuit comprises the components of a first adjustable power supply; a first comparator of which the heterophase end is connected with the first adjustable power supply; a controlled switch which comprises a control end, a first switch end and a second switch end, wherein the control end of the controlled switch is connected with the output end of the first comparator; a detecting resistor which is serially arranged between the homophase end of the first comparator and the second switch end of the controlled switch; and a switch module of which the control end is connected with the first switch end of the controlled switch, wherein the input end of the switch module is connected with a charging power supply, and the output end is connected with a lithium battery. The detecting resistor converts a charging current to a sampling voltage. The first comparator compares the value of sampling voltage with the value of a reference voltage and controls the controlled switch. The controlled switch controls the switch module for activating on condition that the electric quantity of the lithium battery is not enough. The lithium battery charging circuit and the lamp can get rid of dependence to a specialized charger and can charge the lithium battery by means of a common power supply. Furthermore high safety and high reliability are realized.
Description
technical field [0001] The invention relates to a charging circuit, in particular to a lithium battery charging circuit and a lamp. Background technique [0002] The charging of existing rechargeable batteries is usually controlled by an integrated chip and adopts three-stage charging. Flashlights, searchlights and other built-in battery lamps usually use a charger with automatic charging control function. At the battery end, it is only necessary to connect a diode in series to prevent reverse polarity. The lamp itself does not have charging detection and control functions. It is completed by an external supporting charger. This causes the lamp to rely too much on the special charger. If the matching charger fails, the lamp cannot be charged with a common power supply, which brings inconvenience to use. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the above-mentioned prior art, and propo...
Claims
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IPC IPC(8): H02J7/00
Inventor 周明杰张飞
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD