Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

A dual-feedback short circuit protection device

A short-circuit protection and double-feedback technology, which is applied in emergency protection circuit devices, overcurrent-responsive protection, and electrical components, can solve problems such as increasing the loss of short-circuit protection circuits and reducing the reliability of switching power supplies. Wide range, strong capacitive load capacity, and low loss effect

Inactive Publication Date: 2008-03-26
ZTE CORP
View PDF1 Cites 13 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A dual-feedback short circuit protection device
  • A dual-feedback short circuit protection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Figure 1 shows a short-circuit protection device with double-loop control, including a current detection circuit 21, a signal comparison circuit 22, and a short-circuit action circuit 23 connected in sequence; it also includes a compensation signal delay circuit 11 and a signal comparison circuit 12.

[0028] The following is a detailed description of the dual feedback short-circuit protection device in conjunction with Figure 2:

[0029] 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 supp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This invention puts forward a dual-feedback short-circuit protection device including a current test circuit, a second signal comparison circuit and a short-circuit operating circuit connected orderly characterizing in also including a compensated signal delay circuit, a first signal comparison circuit and the short-circuit operating circuit connectd orderly, in which, the compensated signal delay circuit delays the voltage compensation signal and outputs it to the first signal comparison circuit, which compares the input signal with a threshold value, if it is greater than that, it sends a short-circuit control signal to the operation circuit to control the switch entering into a short-circuit protection state, when the supply with a capacitance load operates normally, the delay circuit outputs a threshold value with the voltage smaller than the first signal comparison circuit, the short-circuit operation circuit does not operate, when the load is over a preset sphere, it outputs a threshold value with the voltage greater than the first one, the operation circuit controls the switch supply entering into a short-circuit 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10H02H3/08
Inventor 甘旭
Owner ZTE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products