Unlock instant, AI-driven research and patent intelligence for your innovation.

A LED driving power supply and its output terminal short-circuit protection circuit

A short-circuit protection circuit and LED driving technology, which is applied in the direction of over-current protection, can solve the problems of long short-circuit recovery time, large output voltage fluctuation, and large power consumption, and achieve short-circuit recovery time and overcome power consumption. high effect

Inactive Publication Date: 2019-06-25
GUANGDONG UNIV OF TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, some PWM control chips dedicated to small and medium power LED drive power supply have a built-in output short-circuit protection function. When using the RT pin to realize overheat protection, in the short-circuit state, the LED drive power supply repeats the "off-delay-start" operation, and the output voltage fluctuates greatly. In the short-circuit state, the power consumption is still large, and this working mode makes the LED The drive power is in the restart state, resulting in a long short-circuit recovery time

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 LED driving power supply and its output terminal short-circuit protection circuit
  • A LED driving power supply and its output terminal short-circuit protection circuit
  • A LED driving power supply and its output terminal short-circuit protection circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] figure 1 A structural diagram of an output terminal short-circuit protection circuit of an LED driving power supply provided by an embodiment of the present invention. Such as figure 1 As shown, the short-circuit protection circuit at the output end of the LED drive power supply includes: a short-circuit detection circuit 1 and a short-circuit shutdown circuit 2, the short-circuit detection circuit 1 includes a comparator CP, a non-inverting input circuit 10 and an inverting input circuit 11, and the short-circuit The shutdown circuit 2 includes a switch tube;

[0038] Both the non-inverting input terminal circuit 10 and the inverting input terminal circuit 11 are connected to the positive output terminal Uo of the LED drive power supply, and are respectively connected to the non-inverting input terminal and the inverting input terminal of the comparator CP. At the positive power supply terminal LED+ of the LED load 3 In the short-circuit state of the negative power s...

Embodiment 2

[0046] Such as figure 2 As shown, on the basis of the above embodiments, the inverting input circuit 11 specifically includes a first resistor R1 and a second resistor R2, and the non-inverting input circuit 10 specifically includes a third resistor R3, a fourth resistor R4, a PNP transistor Q2, The sixth resistor R6 and the seventh resistor R7;

[0047] Wherein, the first resistor R1 and the second resistor R2 are connected in series, the common terminal A of the two is connected with the inverting input terminal of the comparator CP, the other terminal of the first resistor R1 is connected with the positive output terminal Uo of the LED driving power supply, and the second The other end of the resistor R2 is grounded.

[0048] The third resistor R3 and the fourth resistor R4 are connected in series, the common terminal B of the two is connected to the non-inverting input terminal of the comparator CP, the other end of the third resistor R3 is connected to the collector of ...

Embodiment 3

[0055] image 3 The circuit diagram of short-circuit protection at the output end of another LED driving power supply provided by the embodiment of the present invention. Such as image 3 As shown, the inverting input circuit 11 specifically includes a first resistor R1 and a second resistor R2, and the non-inverting input circuit 10 specifically includes a third resistor R3, a fourth resistor R4, a PNP transistor Q2, a sixth resistor R6, and a seventh resistor R7, Zener diode Z and capacitor C;

[0056] Wherein, the first resistor R1 and the second resistor R2 are connected in series, the common terminal A of the two is connected with the inverting input terminal of the comparator CP, the other terminal of the first resistor R1 is connected with the positive output terminal UO of the LED driving power supply, and the second The other end of the resistor R2 is grounded;

[0057] The third resistor R3 and the fourth resistor R4 are connected in series, the common terminal B ...

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

The invention discloses an LED driving power supply and an output end short-circuit protection circuit thereof. The output end short-circuit protection circuit comprises a short-circuit detection circuit and a short-circuit switch-off circuit, wherein the short-circuit detection circuit comprises a comparator, a same-phase input end circuit and a reverse-phase input end circuit, the short-circuit switch-off circuit comprises a switching tube, the comparator outputs a low-level signal in a short-circuit state otherwise outputs a high-level signal, and the switching tube is arranged on a power supply loop of an LED load, is cut off when the comparator outputs the low-level signal otherwise is switched on. Compared with the prior art, the output voltage of the LED driving power supply is not closed when the circuit is in the short-circuit state, only the power supply loop of the LED load is cut off, thus, the restart of the power supply is not involved, the problem of high power consumption caused by constant restart can be solved, the LED load can rapidly give out light after a short-circuit fault is recovered, and the short-circuit recovery time is relatively short.

Description

technical field [0001] The invention relates to the field of LED lighting driving power supply, in particular to an LED driving power supply and a short-circuit protection circuit for an output end thereof. Background technique [0002] LED driving power generally requires output short-circuit protection to avoid damage to internal components of the LED driving power due to accidental short-circuiting of the output during the production, testing and maintenance of LED lamps. For this reason, some PWM control chips dedicated to small and medium power LED drive power supply have a built-in output short-circuit protection function. When using the RT pin to realize overheat protection, in the short-circuit state, the LED drive power supply repeats the "off-delay-start" operation, and the output voltage fluctuates greatly. In the short-circuit state, the power consumption is still large, and this working mode makes the LED The drive power is in the restart state, resulting in a ...

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 Patents(China)
IPC IPC(8): H02H3/08
CPCH02H3/08
Inventor 潘永雄陈林海李勇郑明治徐思蔚
Owner GUANGDONG UNIV OF TECH