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A control circuit of power supply with capacitance load capability

A load capacity and control circuit technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of increasing the loss of short-circuit protection circuits and reducing the reliability of switching power supplies, achieving strong capacitive load capacity, low loss, Reliable effect

Inactive Publication Date: 2008-03-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another method uses a delay circuit to delay the action of the short-circuit protection circuit to improve the ability of the switching power supply to carry a capacitive load when it is turned on, but this method will increase the circuit loss during short-circuit protection and reduce the reliability of the switching power supply.

Method used

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  • A control circuit of power supply with capacitance load capability
  • A control circuit of power supply with capacitance load capability

Examples

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Embodiment Construction

[0023] Figure 1 shows a control circuit for a power supply with capacitive load capability, including a current detection circuit 21, a signal comparison circuit 22 and a short-circuit action circuit 23 connected in sequence; and a compensation signal delay circuit 11 and a signal comparison circuit 12.

[0024] The circuit described in Fig. 1 is described in detail below in conjunction with Fig. 2:

[0025] The VCC port provides a stable working voltage for the comparator, the COMP port is connected to the voltage compensation terminal of the pulse width modulation controller voltage feedback loop of the switching power supply, the ISENSE port is connected to the current sampling signal terminal of the switching power supply, and the CTL port is the protection signal output by the short circuit protection circuit , In the protection state, it is an inactive level, which can be used to drive a triode or a MOS tube to turn off the power supply of the switching power supply pulse...

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PUM

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Abstract

This invention puts forward a control circuit of a supply with capacitive load ability including a short-circuit operating circuit and orderly connected compensated signal delay circuit and first signal comparison circuit, in which, said delay circuit delays the voltage compensation signal and outputs it to the first signal comparison circuit, which compares it with a preset threshold value, if it is greater, it sends a short-circuit control signal to the operating circuit, which generates a protection signal to control the switch entering into a protection state, when a load operates normally, the delay circuit outputs a threshold value with the voltage smaller than the set threshold value and the operating circuit does not work, when the load is over the preset sphere, the circuit outputs a threshold value with the voltage greater than the set one, the operatig circuit controls the switch to enter into a protection state.

Description

technical field [0001] The invention relates to a short-circuit protection device for a switching power supply, in particular to the field of switching power supplies that require relatively high capacitive load capacity and reliability. Background technique [0002] Due to its high efficiency, switching power supplies have been widely used. In the protection function of the switching power supply, an output short-circuit protection circuit is generally required to prevent the switching power supply from damaging the power supply and the load due to excessive operating current when it is short-circuited. The performance of the short-circuit protection circuit directly affects the reliability of the entire power supply. At present, most of the short-circuit protection circuits in switching power supplies use the current detection terminal of the current-mode pulse width modulation chip to detect the working current of the primary side of the transformer, and limit its peak v...

Claims

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Application Information

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IPC IPC(8): H02H7/122
Inventor 甘旭
Owner ZTE CORP
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