CN202679748U - LED driving power supply circuit - Google Patents
LED driving power supply circuit Download PDFInfo
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- CN202679748U CN202679748U CN 201220328965 CN201220328965U CN202679748U CN 202679748 U CN202679748 U CN 202679748U CN 201220328965 CN201220328965 CN 201220328965 CN 201220328965 U CN201220328965 U CN 201220328965U CN 202679748 U CN202679748 U CN 202679748U
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Abstract
The utility model relates to an LED driving power supply circuit which comprises a PWM control circuit, a feedback circuit, and a transformer. The primary of the transformer is connected with the PWM control circuit through a switching tube, and the secondary of the transformer is connected with the feedback circuit and then is connected with the PWM control circuit. The LED driving power supply circuit is characterized in that the LED driving power supply circuit also comprises an overvoltage detection circuit, a first end of the overvoltage detection circuit is connected with a positive electrode of an LED, and when output voltage applied to the LED is raised, the overvoltage detection circuit is broken and short-circuited; the LED driving power supply circuit also comprises an over-current protection circuit, a first end of the over-current protection circuit is connected with a second end of the overvoltage detection circuit, a second end of the over-current protection circuit is grounded, a negative electrode of the LED is connected with the first end of the over-current protection circuit, and when the overvoltage detection circuit is broken and short-circuited, a power supply between the positive electrode and the negative electrode of the LED is cut off. Compared with the prior art, according to the LED driving power supply circuit, when the LED driving power supply feedback circuit is abnormal, output voltage is controlled within a safe extra low voltage.
Description
Technical field
The utility model relates to a kind of LED driving power circuit.
Background technology
LED is a kind of low-voltage device, as the light fixture that combination of light sources becomes, generally is three class light fixtures by LED.Compare with the conventional high-tension light fixture, three class light fixtures not only have the advantages such as energy-conservation, long-life, and more outstanding in the advantage of secure context, so supporting led driver must have the output over-voltage protection function when normal or abnormal work with it.
General LED driving power all is by detecting transformer-secondary voltage, then feed back to primary, detect by primary, the LED power supply control chip being quit work, so that output voltage is down within the safety extra low voltage.But when in the LED driving power circuit during feedback circuit abnormal, whole feedback circuit will become open loop situations, can cause like this output voltage infinitely to rise, and the voltage that outputs to the LED two ends can be very high, brings personal safety.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of LED driving power circuit for above-mentioned prior art; when this LED driving power circuit can effectively guarantee LED driving power feedback circuit abnormal; output voltage control is protected the safety of the person within safety extra low voltage.
The utility model solves the problems of the technologies described above the technical scheme that adopts: this LED driving power circuit, comprise pwm control circuit, feedback circuit, transformer, wherein the elementary switching tube that passes through of transformer links to each other with pwm control circuit, link to each other with pwm control circuit behind the secondary connection feedback circuit of transformer, it is characterized in that: also comprise
Over-voltage detection circuit, the first end of this over-voltage detection circuit links to each other with the positive pole of LED, when being used for the output voltage rising on being applied to LED, the over-voltage detection circuit puncture short;
Current foldback circuit, the first end of this current foldback circuit links to each other with the second end of described over-voltage detection circuit, the second end ground connection of this current foldback circuit, the negative pole of LED links to each other with the first end of described current foldback circuit; Be used for when overvoltage testing circuit puncture short the power supply between the positive pole of cut-out LED and the negative pole of LED;
As improvement, described over-voltage detection circuit can be a voltage stabilizing didoe, and the negative pole of this voltage stabilizing didoe links to each other with the positive pole of LED, and the positive pole of this voltage stabilizing didoe links to each other with the first end of current foldback circuit.
Described over-voltage detection circuit also can be attitude twin zener dioder at a flash, and the negative pole of this Transient Suppression Diode links to each other with the positive pole of LED, and the positive pole of this Transient Suppression Diode links to each other with the first end of current foldback circuit.
Described current foldback circuit can adopt a Chip-R, also can adopt fuse.
Compared with prior art; the utility model has the advantage of: by over-voltage detection circuit and current foldback circuit are set; so that the LED driving power circuit transient response that the utility model provides is exceedingly fast; can be down to zero volt to the output voltage that is applied on the LED rapidly; in the time of effectively guaranteeing LED driving power feedback circuit abnormal; output voltage control is protected the safety of the person within safety extra low voltage.
Description of drawings
Fig. 1 is the circuit theory diagrams of LED driving power circuit among the utility model embodiment one;
Fig. 2 is the circuit theory diagrams of LED driving power circuit among the utility model embodiment two;
Fig. 3 is the circuit theory diagrams of LED driving power circuit among the utility model embodiment three;
Fig. 4 is the circuit theory diagrams of LED driving power circuit among the utility model embodiment four.
Embodiment
Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.
Embodiment one:
Referring to LED driving power circuit shown in Figure 1, it comprises pwm control circuit, feedback circuit, transformer TR1, over-voltage detection circuit and current foldback circuit, wherein the elementary switching tube Q1 that passes through of transformer TR1 links to each other with pwm control circuit, link to each other with pwm control circuit behind the secondary connection feedback circuit of transformer TR1, the first end of over-voltage detection circuit links to each other with the positive pole of LED, when being used for the output voltage rising on being applied to LED, the over-voltage detection circuit puncture short, the second end of over-voltage detection circuit links to each other with the first end of current foldback circuit, the second end ground connection of current foldback circuit, the negative pole of LED links to each other with the first end of described current foldback circuit; Be used for when overvoltage testing circuit puncture short the power supply between the positive pole of cut-out LED and the negative pole of LED; In the present embodiment, that over-voltage detection circuit is used is a voltage stabilizing didoe D1, and that current foldback circuit is used is Chip-R R1, and wherein R1 power is as far as possible little.
The basic functional principle of this circuit is that when output voltage raise, the voltage stabilizing didoe D1 of over-voltage detection circuit will puncture; instantaneous large-current passes through current foldback circuit; cause the current foldback circuit action, cut off the output major loop, the pressure drop at LED two ends falls after rise rapidly is down to zero volt.
Embodiment two
Different from embodiment one is that current foldback circuit is used is fuse F1, referring to shown in Figure 2.
Embodiment three
Different from embodiment one is that over-voltage detection circuit adopts is Transient Suppression Diode D1, referring to shown in Figure 3.
Embodiment four:
Different from embodiment one is, that over-voltage detection circuit is used is a Transient Suppression Diode D1, and the fuse F1 that current foldback circuit is used is referring to shown in Figure 4.
Claims (5)
1. a LED driving power circuit comprises pwm control circuit, feedback circuit, transformer, wherein the elementary switching tube that passes through of transformer links to each other with pwm control circuit, links to each other with pwm control circuit behind the secondary connection feedback circuit of transformer, it is characterized in that: also comprise
Over-voltage detection circuit, the first end of this over-voltage detection circuit links to each other with the positive pole of LED, when being used for the output voltage rising on being applied to LED, the over-voltage detection circuit puncture short;
Current foldback circuit, the first end of this current foldback circuit links to each other with the second end of described over-voltage detection circuit, the second end ground connection of this current foldback circuit, the negative pole of LED links to each other with the first end of described current foldback circuit; Be used for when overvoltage testing circuit puncture short the power supply between the positive pole of cut-out LED and the negative pole of LED.
2. LED driving power circuit according to claim 1 is characterized in that: described over-voltage detection circuit one voltage stabilizing didoe, and the negative pole of this voltage stabilizing didoe links to each other with the positive pole of LED, and the positive pole of this voltage stabilizing didoe links to each other with the first end of current foldback circuit.
3. LED driving power circuit according to claim 1; it is characterized in that: described over-voltage detection circuit is a transient state twin zener dioder; the negative pole of this Transient Suppression Diode links to each other with the positive pole of LED, and the positive pole of this Transient Suppression Diode links to each other with the first end of current foldback circuit.
4. LED driving power circuit according to claim 1, it is characterized in that: described current foldback circuit is a Chip-R.
5. LED driving power circuit according to claim 1, it is characterized in that: described current foldback circuit is a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220328965 CN202679748U (en) | 2012-07-09 | 2012-07-09 | LED driving power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220328965 CN202679748U (en) | 2012-07-09 | 2012-07-09 | LED driving power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202679748U true CN202679748U (en) | 2013-01-16 |
Family
ID=47500615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220328965 Expired - Lifetime CN202679748U (en) | 2012-07-09 | 2012-07-09 | LED driving power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202679748U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104023445A (en) * | 2014-06-12 | 2014-09-03 | 电子科技大学 | LED driving circuit |
| CN104426120A (en) * | 2013-09-09 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Overcurrent and overvoltage protection circuit and lamp |
| CN107529242A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN114173460A (en) * | 2021-11-19 | 2022-03-11 | 深圳市多思迈光电有限公司 | Lamp control circuit and controller |
-
2012
- 2012-07-09 CN CN 201220328965 patent/CN202679748U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426120A (en) * | 2013-09-09 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Overcurrent and overvoltage protection circuit and lamp |
| CN104023445A (en) * | 2014-06-12 | 2014-09-03 | 电子科技大学 | LED driving circuit |
| CN104023445B (en) * | 2014-06-12 | 2016-04-06 | 电子科技大学 | A kind of LED drive circuit |
| CN107529242A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN107529242B (en) * | 2016-06-22 | 2019-06-21 | 华润矽威科技（上海）有限公司 | A kind of LED drive circuit and method of equalization efficiency and power factor |
| CN114173460A (en) * | 2021-11-19 | 2022-03-11 | 深圳市多思迈光电有限公司 | Lamp control circuit and controller |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130116 |