CN202602243U - LED (Light-Emitting Diode) illumination power supply protection circuit - Google Patents
LED (Light-Emitting Diode) illumination power supply protection circuit Download PDFInfo
- Publication number
- CN202602243U CN202602243U CN 201220264222 CN201220264222U CN202602243U CN 202602243 U CN202602243 U CN 202602243U CN 201220264222 CN201220264222 CN 201220264222 CN 201220264222 U CN201220264222 U CN 201220264222U CN 202602243 U CN202602243 U CN 202602243U
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- resistance
- power supply
- illumination power
- protection circuit
- supply protection
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Abstract
The utility model relates to an LED (Light-Emitting Diode) illumination power supply protection circuit, in particular to the LED illumination power supply protection circuit provided with a single-grade power factor correction function. The main principle of the LED illumination power supply protection circuit is as follows: when an output load is normal, the LED illumination power supply protection circuit is automatically connected and the stable work of the circuit is guaranteed; and when the output load is short-circuited, the connection with the load is automatically cut off to prevent a front-grade component from being not damaged, so that the whole circuit can reliably and stably work. The LED illumination power supply protection circuit has the beneficial effect that the stable work of the circuit can be guaranteed and has the advantages of simple structure, high reliability and flexibility in controlling. The LED illumination power supply protection circuit is particularly suitable for an LED illumination power supply circuit.
Description
Technical field
The utility model relates to a kind of LED mains lighting supply protective circuit, relates to a kind of LED mains lighting supply protective circuit that possesses the single-stage Active PFC specifically.
Background technology
In vogue along with global energy-saving and emission-reduction, the LED illuminating product because have environmental protection, numerous advantages such as energy-conservation become market focus.The LED mains lighting supply is LED illuminating product " heart " part; This just requires the LED mains lighting supply to want tool high power factor, low total harmonic distortion, high reliability and high stability; And, be widely used in LED mains lighting supply field because single-stage PFC (Active PFC) circuit has high power factor, advantages such as low total harmonic distortion, low cost and high efficiency.But the problem that present single-stage pfc circuit exists mainly is: owing to guarantee high power factor, so the feedback control loop low-response, when output short-circuit, damage the prime device easily, cause circuit can not keep normal and stable work.
The utility model content
The utility model technical problem to be solved, be exactly to existing single-stage pfc circuit can not steady operation problem, a kind of LED mains lighting supply protective circuit is proposed.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of LED mains lighting supply protective circuit; Comprise electric capacity, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, switching tube and field-effect transistor; One end of said switching tube and an end of an end of electric capacity and the 3rd resistance are connected, encourage that an end of the other end and the 4th resistance of end and the 3rd resistance is connected, the other end is connected with an end of first resistance; The other end of said first resistance is connected with an end of second resistance and the grid of field-effect transistor; The other end of said second resistance is connected with the other end of the source electrode of field-effect transistor, electric capacity and an end of the 5th resistance, and the other end of said the 5th resistance is connected with the other end of the drain electrode of field-effect transistor with the 4th resistance.
Concrete; Said switching tube is a NPN type triode, and the emitter of said NPN type triode is connected with an end of an end of electric capacity and the 3rd resistance, an end of the other end of base stage and the 3rd resistance and the 4th resistance is connected, collector electrode is connected with an end of first resistance.
The beneficial effect of the utility model does, can guarantee the steady operation of circuit, have simultaneously simple in structure, reliability is high and control advantage flexibly.
Description of drawings
Fig. 1 is the circuit theory diagrams of embodiment.
Embodiment
Below in conjunction with accompanying drawing and embodiment, describe the technical scheme of the utility model in detail:
The LED mains lighting supply protective circuit of the utility model; Comprise electric capacity, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, switching tube and field-effect transistor; One end of said switching tube and an end of an end of electric capacity and the 3rd resistance are connected, encourage that an end of the other end and the 4th resistance of end and the 3rd resistance is connected, the other end is connected with an end of first resistance; The other end of said first resistance is connected with an end of second resistance and the grid of field-effect transistor; The other end of said second resistance is connected with the other end of the source electrode of field-effect transistor, electric capacity and an end of the 5th resistance, and the other end of said the 5th resistance is connected with the other end of the drain electrode of field-effect transistor with the 4th resistance.Wherein, switching tube both can have been selected NPN type triode for use, also can select for use positive-negative-positive triode or other to have the switching tube of identical function, like metal-oxide-semiconductor etc.
Embodiment:
As shown in Figure 1; Switching tube in this example is selected NPN type triode for use; Triode is as a kind of components and parts commonly used; Has the ripe and stable advantage of operation technique; What field-effect transistor adopted is the N slot field-effect transistor; Physical circuit comprises capacitor C, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, NPN type triode Q1 and field-effect transistor Q2 in this example; The emitter of said NPN type triode Q1 is connected with an end of an end of capacitor C and the 3rd resistance R 3, an end of the other end of base stage and the 3rd resistance R 3 and the 4th resistance R 4 is connected, collector electrode is connected with an end of first resistance R 1; The other end of said first resistance R 1 is connected with an end of second resistance R 2 and the grid of field-effect transistor Q2, and the other end of said second resistance R 2 is connected with the source electrode of field-effect transistor Q2, the other end of capacitor C and an end of the 5th resistance R 5, and the other end of said the 5th resistance R 5 is connected with the drain electrode of field-effect transistor Q2 and the other end of the 4th resistance R 4.
The operation principle of the utility model is: when output connected the LED load, electric current had electric current to flow through in the 3rd resistance R 3 and the 4th resistance R 4 simultaneously through LED load and the 5th resistance R 5 formation loops; When the pressure drop above the 3rd resistance R 3 reaches 0.7V, NPN type triode Q1 conducting, at this moment electric current flows through first resistance R 1 and second resistance R 2; When the voltage drop above second resistance R 2 reaches the threshold voltage of N slot field-effect transistor Q2, N slot field-effect transistor Q2 conducting, the LED load just can be worked on normal and stable ground like this, and this moment the 5th, resistance R 5 was ended.After output connects the LED loaded work piece, if load short circuits does not at this moment just have electric current to flow through on the 3rd resistance R 3 and the 4th resistance R 4; Pressure drop above the 3rd resistance R 3 is 0V; NPN triode Q1 can not conducting, and at this moment also not having electric current to flow through first resistance R 1 and the pressure drops above second resistance R, 2, the second resistance R 2 is the conducting that 0V can't driving N slot field-effect transistor Q2; This moment, electric current only flow through the 5th resistance R 5, so just can protect the circuit reliable and stable ground work of front.
Claims (2)
1. LED mains lighting supply protective circuit; Comprise electric capacity, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, switching tube and field-effect transistor; One end of said switching tube and an end of an end of electric capacity and the 3rd resistance are connected, encourage that an end of the other end and the 4th resistance of end and the 3rd resistance is connected, the other end is connected with an end of first resistance; The other end of said first resistance is connected with an end of second resistance and the grid of field-effect transistor; The other end of said second resistance is connected with the other end of the source electrode of field-effect transistor, electric capacity and an end of the 5th resistance, and the other end of said the 5th resistance is connected with the other end of the drain electrode of field-effect transistor with the 4th resistance.
2. a kind of LED mains lighting supply protective circuit according to claim 1; It is characterized in that; Said switching tube is a NPN type triode, and the emitter of said NPN type triode is connected with an end of an end of electric capacity and the 3rd resistance, an end of the other end of base stage and the 3rd resistance and the 4th resistance is connected, collector electrode is connected with an end of first resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220264222 CN202602243U (en) | 2012-06-06 | 2012-06-06 | LED (Light-Emitting Diode) illumination power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220264222 CN202602243U (en) | 2012-06-06 | 2012-06-06 | LED (Light-Emitting Diode) illumination power supply protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202602243U true CN202602243U (en) | 2012-12-12 |
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ID=47319760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220264222 Expired - Lifetime CN202602243U (en) | 2012-06-06 | 2012-06-06 | LED (Light-Emitting Diode) illumination power supply protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202602243U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014166125A1 (en) * | 2013-04-12 | 2014-10-16 | 深圳市华星光电技术有限公司 | Overcurrent protection circuit of light source drive module, and backlight module |
| CN104466888A (en) * | 2013-09-25 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Protective circuit |
-
2012
- 2012-06-06 CN CN 201220264222 patent/CN202602243U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014166125A1 (en) * | 2013-04-12 | 2014-10-16 | 深圳市华星光电技术有限公司 | Overcurrent protection circuit of light source drive module, and backlight module |
| CN104466888A (en) * | 2013-09-25 | 2015-03-25 | 深圳市海洋王照明工程有限公司 | Protective circuit |
| CN104466888B (en) * | 2013-09-25 | 2018-11-27 | 深圳市海洋王照明工程有限公司 | A kind of protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
|
| CX01 | Expiry of patent term |