CN202084911U - Over-current protector for LED drive power supply - Google Patents
Over-current protector for LED drive power supply Download PDFInfo
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- CN202084911U CN202084911U CN2011201961366U CN201120196136U CN202084911U CN 202084911 U CN202084911 U CN 202084911U CN 2011201961366 U CN2011201961366 U CN 2011201961366U CN 201120196136 U CN201120196136 U CN 201120196136U CN 202084911 U CN202084911 U CN 202084911U
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Abstract
The utility model discloses an over-current protector for an LED drive power supply. In specific, a hardware current negative feedback circuit is added at the source of the MOS transistor of the LED drive power supply, when MOS transistor has a current exceeding a preset current, the hardware current negative feedback circuit is conducted, so that the MOS transistor is disconnected. Burn-out cases of the MOS transistor due to the abnormal circuit are reduced by using the over-current protector, thus avoiding the burn-out accidents of a lamp plate.
Description
Technical field
The utility model relates to the LED power technique fields, relates in particular to a kind of overcurrent protective device of LED driving power.
Background technology
At present, LED driving power lamp is as the novel illumination product of 21 century, and its excellent energy-saving effect obtains everybody approval, but the LED lamp driving power source often has generation as the vitals of LED lamp because of circuit abnormality causes the example that the LED lamp plate burns out.
In existing circuit abnormality accident, because of the damage of metal-oxide-semiconductor causes that fault is in the great majority, so the second protection of metal-oxide-semiconductor is just seemed particularly important.
Summary of the invention
The purpose of this utility model provides a kind of overcurrent protective device of LED driving power, can reduce metal-oxide-semiconductor because of burning out that circuit abnormality causes, and then reduces the accident generation that causes that lamp plate burns out.
The purpose of this utility model is achieved through the following technical solutions:
A kind of overcurrent protective device of LED driving power is characterized in that, adds the hardware current negative feedback circuit at the metal-oxide-semiconductor source electrode place of LED driving power, and when metal-oxide-semiconductor surpassed the setting electric current, this hardware current negative feedback circuit conducting was turn-offed metal-oxide-semiconductor.
The technical scheme that is provided by above-mentioned the utility model specifically is to add the hardware current negative feedback circuit at the metal-oxide-semiconductor source electrode place of LED driving power as can be seen, and when metal-oxide-semiconductor surpasses when setting electric current, this hardware current negative feedback circuit conducting is turn-offed metal-oxide-semiconductor.Can reduce metal-oxide-semiconductor because of burning out that circuit abnormality causes by this overcurrent protective device, and then reduce the accident generation that causes that lamp plate burns out.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic diagram of LED driving power control circuit in the prior art;
The control circuit schematic diagram of the overcurrent protective device of the LED driving power that Fig. 2 is provided for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on embodiment of the present utility model, those of ordinary skills belong to protection range of the present utility model not making the every other embodiment that is obtained under the creative work prerequisite.
The utility model embodiment adds the hardware current negative feedback circuit at the metal-oxide-semiconductor source electrode place of LED driving power, and when metal-oxide-semiconductor surpassed the setting electric current, this hardware current negative feedback circuit conducting was turn-offed metal-oxide-semiconductor.
Be by detecting the metal-oxide-semiconductor source current specifically; and in this some adding hardware Current Negative Three-Point Capacitance; when the metal-oxide-semiconductor electric current is within setting range; control circuit is not worked; when metal-oxide-semiconductor surpasses the setting electric current; the switch triode conducting drags down the supply power voltage of PWM IC, and metal-oxide-semiconductor is turn-offed because of the VCC short of electricity of control IC, thereby realizes the overcurrent protection function to metal-oxide-semiconductor.
Below in conjunction with accompanying drawing the utility model embodiment is described in further detail, Fig. 1 is the schematic diagram of LED driving power control circuit in the prior art, among Fig. 1: when the source current of metal-oxide-semiconductor Q1 becomes big, CS end input current becomes big, when reaching the design load of IC, the GATE output low level is turn-offed metal-oxide-semiconductor.But when practical application,, cause metal-oxide-semiconductor to burn out and situation that GATE does not also turn-off often because of the otherness of resistance R 1 or IC or external circuit.
Be illustrated in figure 2 as the control circuit schematic diagram of the overcurrent protective device of the LED driving power that the utility model embodiment provided; added the circuit shown in the frame of broken lines among Fig. 2; detect the metal-oxide-semiconductor source current; VCC is turn-offed in direct adding by the hardware Current Negative Three-Point Capacitance; because of GATE by grounding through resistance, this moment metal-oxide-semiconductor grid no-output, Controlling Source electrode current no-output; thereby reach the purpose of protection metal-oxide-semiconductor, realized the second protection of metal-oxide-semiconductor.
In the specific implementation process, the following description of circuit typical case's connection:
Cause that when output current is unusual the metal-oxide-semiconductor source current becomes big; because of the source electrode string has resistance R 1; through this resistance current signal is transformed into voltage signal like this; through diode D1, be input to the base stage of Q2 after resistance R 2 and capacitor C 1 filtering, switch triode is because of the high voltage conducting of base stage; make VCC be pulled down to low level; like this, the PWM control IC has been cut off the output of metal-oxide-semiconductor Q1 because of the short of electricity of VCC, reaches the purpose of protection metal-oxide-semiconductor.
When operate as normal, the base stage of Q2 is because of the shutoff of diode D1 but low level, and triode is in off state like this, but PWM IC operate as normal.Pressure drop in the time of will guaranteeing operate as normal during application on the R1 makes triode be in off state less than 0.7V, and the resistance that changes R2 and R3 in addition can change the scope of setting electric current.
The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claims.
Claims (1)
1. the overcurrent protective device of a LED driving power is characterized in that, adds the hardware current negative feedback circuit at the metal-oxide-semiconductor source electrode place of LED driving power, and when metal-oxide-semiconductor surpassed the setting electric current, this hardware current negative feedback circuit conducting was turn-offed metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201961366U CN202084911U (en) | 2011-06-13 | 2011-06-13 | Over-current protector for LED drive power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201961366U CN202084911U (en) | 2011-06-13 | 2011-06-13 | Over-current protector for LED drive power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202084911U true CN202084911U (en) | 2011-12-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201961366U Expired - Fee Related CN202084911U (en) | 2011-06-13 | 2011-06-13 | Over-current protector for LED drive power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202084911U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199506A (en) * | 2013-04-12 | 2013-07-10 | 深圳市华星光电技术有限公司 | Over-current protection circuit and backlight module of light source drive module |
| WO2019015224A1 (en) * | 2017-07-18 | 2019-01-24 | 深圳市华星光电半导体显示技术有限公司 | Overcurrent protection circuit |
| US10637230B2 (en) | 2017-07-18 | 2020-04-28 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Over current protection circuit |
-
2011
- 2011-06-13 CN CN2011201961366U patent/CN202084911U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199506A (en) * | 2013-04-12 | 2013-07-10 | 深圳市华星光电技术有限公司 | Over-current protection circuit and backlight module of light source drive module |
| CN103199506B (en) * | 2013-04-12 | 2015-07-15 | 深圳市华星光电技术有限公司 | Over-current protection circuit and backlight module of light source drive module |
| WO2019015224A1 (en) * | 2017-07-18 | 2019-01-24 | 深圳市华星光电半导体显示技术有限公司 | Overcurrent protection circuit |
| US10637230B2 (en) | 2017-07-18 | 2020-04-28 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Over current protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111221 Termination date: 20160613 |