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Charging control device

A charging control and control signal technology, which is applied in the direction of circuit devices, battery circuit devices, collectors, etc., can solve the problems of short-circuit protection circuit volume and cost increase, achieve volume and cost increase, improve reliability, and reduce work Effect of Current and Loss

Inactive Publication Date: 2018-05-29
徐承金
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since this detection method needs to connect the sampling resistor in series with the output circuit, as the rated output current of the battery charger increases, it is required to use a sampling resistor with higher power and smaller resistance, which also makes the size and cost of the short circuit protection circuit increase

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Embodiment Construction

[0016] Combine below figure 1 , 2 The working principle of the patent of the present invention is further explained:

[0017] The invention patent includes an output voltage detection circuit 1 , a protection voltage threshold setting circuit 2 and a control signal delay circuit 3 .

[0018] Depend on figure 2 Among them, R8~R12, Q1, U1B, and C2 form a power-on delay circuit. When the battery charger is turned on, the 7th pin of U1B will output a low level and pull the 1st pin of U1A to a low level through R8 and Q1; at the same time, VCC will pass through R11 Slowly charge C2. When C2 is charged to a voltage higher than the voltage divided by R9 and R10 (that is, the voltage of pin 6 of U1B), pin 7 of U1B outputs a high level and turns off Q1 so that the voltage of pin 1 of U1A is no longer controlled. Forcibly pull it low, and the function of the power-on delay circuit ends here. The delay time of this circuit depends on the charging time of the output capacitor of the b...

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Abstract

The invention provides a charging control device, comprising an output voltage detection circuit, a protection voltage threshold setting circuit and a control signal delay circuit. Based on the fact that the voltage instantaneously drops to 0 when the output of a battery charger is short-circuited, the output voltage is detected, and a control signal is output to a power management chip to make the whole battery charger stop working, thus achieving a protection effect. A protection function is achieved by stopping the work of the whole power supply, and the safety of the charger is ensured.

Description

technical field [0001] The invention relates to the field of battery chargers, in particular to battery chargers. Background technique [0002] At present, battery chargers are more and more widely used. In the protection function of battery chargers, output short circuit protection is generally required to prevent battery chargers from being damaged by excessive operating current when the output short circuit occurs. The quality of the output short-circuit protection directly affects the reliability of the entire battery charger. [0003] At present, most of the short-circuit protection circuits in battery chargers use the current peak limit circuit inside the pulse width modulation chip to detect the working current of the primary side of the transformer, and limit its peak value to achieve the function of short-circuit protection. Since this only limits the current peak value of the main circuit, it has been frequently protected and restored in the short-circuit state, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0029H02J7/00304
Inventor 徐承金
Owner 徐承金