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Capacitor charger system and digital control module

A digital control and charger technology, which is applied in the direction of current collectors, battery disconnecting circuits, battery circuit devices, etc., can solve the problems of increased volume and cost of short-circuit protection circuits, achieve increased volume and cost, improve reliability, Effect of reducing operating current and loss

Inactive Publication Date: 2019-02-26
肖训书
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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

Method used

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  • Capacitor charger system and digital control module

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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 present invention provides a capacitor charger system and digital control module. The capacitor charger system and digital control module comprises an output voltage detection circuit, a protection voltage threshold value set circuit and a control signal delay circuit. The capacitor charger system and digital control module employs the feature that a voltage is instantaneously fell to 0V whena battery charger output short-circuit is generated to detect the output voltage, and finally, control signals are output to a power source management chip to allow the whole battery charger to stop work to achieve a protection effect. The capacitor charger system and digital control module achieves a protection function through a mode of stopping the work of the whole power source so as to ensurethe safety of the charger.

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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IPC IPC(8): H02J7/00
CPCH02J7/0031
Inventor 肖训书
Owner 肖训书
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