CN104218518B - Over current and over voltage protection electric circuit and lamp using same - Google Patents
Over current and over voltage protection electric circuit and lamp using same Download PDFInfo
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- CN104218518B CN104218518B CN201310211114.6A CN201310211114A CN104218518B CN 104218518 B CN104218518 B CN 104218518B CN 201310211114 A CN201310211114 A CN 201310211114A CN 104218518 B CN104218518 B CN 104218518B
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Abstract
This invention relates toan over current and over voltage electric circuit and a lamp using same. The lamp includes one photosensitive device, one control end and one power circuit unit, the photosensitive device coupling the control end. The control end controls the on-off state of the output end of a power source electric circuit. The over current and over voltage protection circuit includes one a first resistor, a second resistor, a third resistor, a fourth resistor, one PNP type triode, one voltage stabilization diode and one luminescent device. The emitter of PNP type triode is coupled with one end of the first resistor and the output end of power source electric circuit; base of the PNP type triode is coupled with one end of the second resistor; the collector of PNP type triode is coupled with the positive pole of the voltage stabilization diode, one end of the third resistor and one end of the fourth resistor; the other end of the first resistor, the negative pole of the voltage stabilization diode and the other end of the second resistor are grounded ; the other end of the third resistor is grounded through the luminescent device; the other end of the fourth resistor is grounded; the luminescent device is coupled with the photosensitive device and form a photoelectric coupler.
Description
Technical field
The present invention relates to protection circuit field, particularly to a kind of power circuit needing over-current over-voltage protection function and its
Light fixture.
Background technology
Need to use Switching Power Supply in a lot of circuit at present, its output end will damage electricity if there is overcurrent-overvoltage phenomenon
Road.So overcurrent-overvoltage protecting circuit must be added.
In view of this, a kind of overcurrent-overvoltage protecting circuit and its light fixture are inventor provided.
Content of the invention
For defect of the prior art, the invention provides a kind of overcurrent-overvoltage protecting circuit and its light fixture, overcome
The difficulty of prior art, solves the problems, such as overcurrent-overvoltage, the reliability of lifting circuit with simple circuit.
According to an aspect of the present invention, provide a kind of overcurrent-overvoltage protecting circuit of light fixture, described light fixture also includes one
Light-sensitive device, a control end and a power circuit unit, described light-sensitive device couples described control end, and described control end controls institute
State the shutoff of the output end of power circuit unit or conducting it is characterised in that described overcurrent-overvoltage protecting circuit includes：One first
Resistance, a second resistance, a 3rd resistor, one the 4th resistance, a PNP type triode, a Zener diode and a photophore
Part；
The emitter stage of described PNP type triode couples one end of described first resistor and the output end of described power circuit,
Base stage couples one end of described second resistance, and the colelctor electrode of described PNP type triode couples the positive pole of described Zener diode, institute
State one end of 3rd resistor and one end of described 4th resistance；
The other end of the other end of described first resistor, the negative pole of described Zener diode and described second resistance connects respectively
Ground；
The other end of described 3rd resistor is grounded by described luminescent device；
The other end ground connection of described 4th resistance；
Described luminescent device forms a photoelectric coupled device optically coupling to described light-sensitive device.
Preferably, described luminescent device is a light emitting diode, and the positive pole of described light emitting diode couples described 3rd electricity
Resistance, minus earth.
Preferably, described light-sensitive device is photodiode or phototriode.
Preferably, when the voltage difference of described first resistor excessively stream and described PNP type triode base stage to emitter stage is more than
During 0.7V, described PNP type triode conducting, described luminescent device is lit, and described light-sensitive device optocoupler output high pressure is extremely described
The control end of power circuit unit, described control end controls the output end of described power circuit unit to turn off.
Preferably, when the over-pressed and described Zener diode of described first resistor is breakdown, described luminescent device is lit,
Described light-sensitive device optocoupler exports high pressure to the control end of described power circuit unit, and described control end controls described power circuit
The output end of unit turns off.
Preferably, described power circuit unit includes a pulse width modulation chip, described pulse width modulation chip
One output pin is coupled to the output end of described power circuit unit, and described output pin provides the voltage of described output end, institute
State the shutoff of output pin or the conducting that control end controls described pulse width modulation chip.
According to another aspect of the present invention, also provide a kind of light fixture, including an overcurrent-overvoltage protecting circuit, a photosensor
Part, a control end and a power circuit unit, described light-sensitive device couples described control end, and described control end controls described power supply
The shutoff of the output end of circuit unit or conducting, described overcurrent-overvoltage protecting circuit includes：One first resistor, a second resistance,
One 3rd resistor, one the 4th resistance, a PNP type triode, a Zener diode and a luminescent device；
The emitter stage of described PNP type triode couples one end of described first resistor and the output end of described power circuit,
Base stage couples one end of described second resistance, and the colelctor electrode of described PNP type triode couples the positive pole of described Zener diode, institute
State one end of 3rd resistor and one end of described 4th resistance；
The other end of the other end of described first resistor, the negative pole of described Zener diode and described second resistance connects respectively
Ground；
The other end of described 3rd resistor is grounded by described luminescent device；
The other end ground connection of described 4th resistance；
Described luminescent device forms a photoelectric coupled device optically coupling to described light-sensitive device；
Described luminescent device is a light emitting diode, and the positive pole of described light emitting diode couples described 3rd resistor, negative pole
Ground connection；
Described light-sensitive device is photodiode or phototriode.
Preferably, when the voltage difference of described first resistor excessively stream and described PNP type triode base stage to emitter stage is more than
During 0.7V, described PNP type triode conducting, described luminescent device is lit, and described light-sensitive device optocoupler output high pressure is extremely described
The control end of power circuit unit, described control end controls the output end of described power circuit unit to turn off.
Preferably, when the over-pressed and described Zener diode of described first resistor is breakdown, described luminescent device is lit,
Described light-sensitive device optocoupler exports high pressure to the control end of described power circuit unit, and described control end controls described power circuit
The output end of unit turns off.
Preferably, described power circuit unit includes a pulse width modulation chip, described pulse width modulation chip
One output pin is coupled to the output end of described power circuit unit, and described output pin provides the voltage of described output end, institute
State the shutoff of output pin or the conducting that control end controls described pulse width modulation chip.
Compared with prior art, due to employing above technology, the overcurrent-overvoltage protecting circuit of the present invention and its light fixture set
Count simple and reliable, inexpensive, working stability, be suitable as protection circuit and be applied in various constant-current drive circuits.
Brief description
The detailed description with reference to the following drawings, non-limiting example made by reading, the further feature of the present invention,
Objects and advantages will become more apparent upon：
Fig. 1 illustrates according to a specific embodiment of the present invention, the circuit theory diagrams of the light fixture of the present invention.
Reference
1 first resistor
2 second resistances
3 3rd resistors
4 the 4th resistance
5 PNP type triode
6 Zener diodes
7 photoelectric coupled devices
71 luminescent devices
72 light-sensitive devices
8 pulse width modulation chips
10 power circuit unit
11 output ends
12 control ends
13 output pins
100 overcurrent-overvoltage protecting circuits
Specific embodiment
It will be appreciated by those skilled in the art that those skilled in the art can realize becoming with reference to prior art and above-described embodiment
Change example, will not be described here.Such change case has no effect on the flesh and blood of the present invention, will not be described here.
Fig. 1 illustrates according to a specific embodiment of the present invention, the circuit theory diagrams of the light fixture of the present invention.As Fig. 1
Shown, a kind of light fixture of the present invention, including an overcurrent-overvoltage protecting circuit 100, a light-sensitive device 72, a control end 12 and an electricity
Source circuit unit 10, light-sensitive device 72 couples control end 12, the pass of the output end 11 of control end 12 controlling power circuit unit 10
Break or turn on, overcurrent-overvoltage protecting circuit 100 includes：One first resistor 1, a second resistance 2, a 3rd resistor 3, the 4th electricity
Resistance 4, one PNP type triode 5, a Zener diode 6 and a luminescent device 71.
The emitter stage of PNP type triode 5 couples one end of first resistor 1 and the output end 11 of power circuit, and base stage couples
One end of second resistance 2, the colelctor electrode of PNP type triode 5 couples the positive pole of Zener diode 6, one end of 3rd resistor 3 and
One end of four resistance 4.
The other end of the other end of first resistor 1, the negative pole of Zener diode 6 and second resistance 2 is grounded respectively.
The other end of 3rd resistor 3 is grounded by luminescent device 71.
The other end ground connection of the 4th resistance 4.
Luminescent device 71 forms a photoelectric coupled device 7 optically coupling to light-sensitive device 72.
Luminescent device 71 is a light emitting diode, and the positive pole of light emitting diode couples 3rd resistor 3, minus earth.
Light-sensitive device 72 is photodiode or phototriode.
Power circuit unit 10 includes a pulse width modulation chip 8, an output pin 13 of pulse width modulation chip 8
It is coupled to the output end 11 of power circuit unit 10, control end 12 controls the pass of the output pin 13 of pulse width modulation chip 8
Break or turn on.
When the voltage difference of first resistor 1 excessively stream and PNP type triode 5 base stage to emitter stage is more than 0.7V, positive-negative-positive three pole
Pipe 5 turns on, and luminescent device 71 is lit, and light-sensitive device 72 optocoupler exports high pressure to the control end 12 of power circuit unit 10, control
The shutoff of output pin 13 of pulse width modulation chip 8 or conducting in the controlling power circuit unit 10 of end 12 processed.
When first resistor 1 overvoltage and when Zener diode 6 is breakdown, luminescent device 71 is lit, light-sensitive device 72 optocoupler
Export high pressure to the control end 12 of power circuit unit 10, pulse width modulation core in control end 12 controlling power circuit unit 10
The shutoff of output pin 13 of piece 8 or conducting.
For example：Power circuit unit 10 is the constant-current drive circuit that output parameter is 18V/600mA.Electricity when output end 11
When stream is more than 600mA, the resistance of first resistor is 0.1 Ω, and pressure drop thereon is 0.6V, when load unit 8 occur excessively stream or
During short-circuit abnormal conditions, the pressure drop of first resistor 1 reaches 0.7V, so that PNP type triode 5 is turned on, voltage is through 3rd resistor 3
With luminescent device 71, luminescent device 71（1.2V pressure drop）Optocoupler output HIGH voltage closes pulse width to control end 12, control end 12
The output of the output pin 13 of degree modulation chip 8, thus the output end 11 of power cutoff circuit unit 10, realizes overvoltage protection work(
Can, during protection load unit 8 exception, circuit is not damaged by.
The state of the overvoltage protection of the overcurrent-overvoltage protecting circuit of the present invention is as follows：Output end when power circuit unit 10
During 11 appearance overvoltage, promote Zener diode 6 breakdown, then voltage, through Zener diode 6,3rd resistor 3, makes photoelectric coupling
Light emitting diode 71 in device 7 is lighted, and to control end 12, control end 12 closes pulse to the high pressure of the photosensitive output of light-sensitive device 71
The output of the output pin 13 of width modulated chip 8, thus the output end 11 of power cutoff circuit unit 10, realizes overvoltage protection
Function, during protection load unit 8 exception, circuit is not damaged by.3rd resistor 3 therein can select value according to actual design,
Also can cancel.
For example：Power circuit unit 10 is the constant-current drive circuit that output parameter is 18V/600mA.The electricity of Zener diode
Press the resistance for 18V, second resistance to be 100 Ω, the resistance of 3rd resistor be 200 Ω, the resistance of the 4th resistance be 2.2k Ω.Logical
The value crossing the voltage to Zener diode is 18V, then over-voltage protection point is set to 18+1.2 basic settings in 20V.When
During the super many 20V of voltage of output end 11, this circuit will realize above-mentioned over-voltage protecting function.
Obviously, the circuit theory in figure of light fixture as shown in Figure 1 has contained overcurrent-overvoltage protecting circuit 100, therefore mistake
Flow through the structure of voltage protection circuit and principle repeats no more.
In summary, the overcurrent-overvoltage protecting circuit of the present invention and its Design of Luminaires are simple and reliable, inexpensive, it is steady to work
Fixed, it is suitable as protection circuit and be applied in various constant-current drive circuits.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various modifications or modification within the scope of the claims, this not shadow
Ring the flesh and blood of the present invention.
Claims (10)
1. a kind of overcurrent-overvoltage protecting circuit of light fixture, described light fixture also includes a light-sensitive device, a control end and power supply electricity
Road unit, described light-sensitive device couples described control end, and described control end controls the pass of the output end of described power circuit unit
Break or conducting is it is characterised in that described overcurrent-overvoltage protecting circuit includes：One first resistor, a second resistance, one the 3rd electricity
Resistance, one the 4th resistance, a PNP type triode, a Zener diode and a luminescent device；
The emitter stage of described PNP type triode is respectively coupled to one end of described first resistor and the output end of described power circuit,
Base stage couples one end of described second resistance, and the colelctor electrode of described PNP type triode is just being respectively coupled to described Zener diode
One end of pole, one end of described 3rd resistor and described 4th resistance；
The other end of the other end of described first resistor, the negative pole of described Zener diode and described second resistance is grounded respectively；
The other end of described 3rd resistor is grounded by described luminescent device；
The other end ground connection of described 4th resistance；
Described luminescent device forms a photoelectric coupled device optically coupling to described light-sensitive device.
2. overcurrent-overvoltage protecting circuit as claimed in claim 1 it is characterised in that：Described luminescent device is light-emitting diodes
Pipe, the positive pole of described light emitting diode couples the other end of described 3rd resistor, minus earth.
3. overcurrent-overvoltage protecting circuit as claimed in claim 2 it is characterised in that：Described light-sensitive device be photodiode or
Phototriode.
4. overcurrent-overvoltage protecting circuit as claimed in claim 3 it is characterised in that：When described first resistor excessively stream and described
When PNP type triode base stage to the voltage difference of emitter stage is more than 0.7V, described PNP type triode conducting, described luminescent device quilt
Light, described light-sensitive device optocoupler exports high pressure to the control end of described power circuit unit, and described control end controls described electricity
The output end of source circuit unit turns off.
5. overcurrent-overvoltage protecting circuit as claimed in claim 3 it is characterised in that：When described first resistor is over-pressed and described steady
When pressure diode is breakdown, described luminescent device is lit, and described light-sensitive device optocoupler output high pressure is to described power circuit list
The control end of unit, described control end controls the output end of described power circuit unit to turn off.
6. overcurrent-overvoltage protecting circuit as claimed in claim 5 it is characterised in that：Described power circuit unit includes a pulse
Width modulated chip, an output pin of described pulse width modulation chip is coupled to the output end of described power circuit unit,
Described output pin provides the voltage of described output end, and described control end controls the output pin of described pulse width modulation chip
Shutoff or conducting.
7. a kind of light fixture, including an overcurrent-overvoltage protecting circuit, a light-sensitive device, a control end and a power circuit unit, institute
State light-sensitive device and couple described control end, described control end controls the shutoff of output end or the conducting of described power circuit unit,
It is characterized in that, described overcurrent-overvoltage protecting circuit includes：One first resistor, a second resistance, a 3rd resistor, one the 4th electricity
Resistance, a PNP type triode, a Zener diode and a luminescent device；
The emitter stage of described PNP type triode is respectively coupled to one end of described first resistor and the output end of described power circuit,
Base stage couples one end of described second resistance, and the colelctor electrode of described PNP type triode is just being respectively coupled to described Zener diode
One end of pole, one end of described 3rd resistor and described 4th resistance；
The other end of the other end of described first resistor, the negative pole of described Zener diode and described second resistance is grounded respectively；
The other end of described 3rd resistor is grounded by described luminescent device；
The other end ground connection of described 4th resistance；
Described luminescent device forms a photoelectric coupled device optically coupling to described light-sensitive device；
Described luminescent device is a light emitting diode, and the positive pole of described light emitting diode couples described 3rd resistor, minus earth；
Described light-sensitive device is photodiode or phototriode.
8. light fixture as claimed in claim 7 it is characterised in that：When described first resistor excessively stream and described PNP type triode base
When the voltage difference of best emitter stage is more than 0.7V, described PNP type triode conducting, described luminescent device is lit, described photosensitive
Device optocoupler exports high pressure to the control end of described power circuit unit, and described control end controls the defeated of described power circuit unit
Go out end to turn off.
9. light fixture as claimed in claim 7 it is characterised in that：When the over-pressed and described Zener diode of described first resistor is hit
When wearing, described luminescent device is lit, and described light-sensitive device optocoupler exports high pressure to the control end of described power circuit unit, institute
Stating control end controls the output end of described power circuit unit to turn off.
10. light fixture as claimed in claim 7 it is characterised in that：Described power circuit unit includes a pulse width modulation core
Piece, an output pin of described pulse width modulation chip is coupled to the output end of described power circuit unit, and described output is drawn
Pin provides the voltage of described output end, and described control end controls the shutoff of output pin of described pulse width modulation chip or leads
Logical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310211114.6A CN104218518B (en) | 2013-05-30 | 2013-05-30 | Over current and over voltage protection electric circuit and lamp using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310211114.6A CN104218518B (en) | 2013-05-30 | 2013-05-30 | Over current and over voltage protection electric circuit and lamp using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104218518A CN104218518A (en) | 2014-12-17 |
| CN104218518B true CN104218518B (en) | 2017-02-22 |
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| CN201310211114.6A Active CN104218518B (en) | 2013-05-30 | 2013-05-30 | Over current and over voltage protection electric circuit and lamp using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106301021A (en) * | 2016-08-17 | 2017-01-04 | 杨洋 | Medical electric power electronic machine DC source |
| CN107911059A (en) * | 2017-12-08 | 2018-04-13 | 成都互聚科技有限公司 | A kind of motor-drive circuit with driving tube defencive function |
| CN113972622A (en) * | 2021-10-25 | 2022-01-25 | 上海电气泰雷兹交通自动化***有限公司 | Automatic circuit overload or short circuit protection device |
Citations (3)
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| CN101715264A (en) * | 2009-12-02 | 2010-05-26 | 海洋王照明科技股份有限公司 | Over-voltage lockout protection circuit and LED drive circuit using same |
| CN201937248U (en) * | 2010-12-22 | 2011-08-17 | 四川长虹电器股份有限公司 | Self-locking protective circuit for switch power supply |
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465535A (en) * | 2007-12-19 | 2009-06-24 | 鸿富锦精密工业（深圳）有限公司 | Output voltage short circuit protection circuit |
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2013
- 2013-05-30 CN CN201310211114.6A patent/CN104218518B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715264A (en) * | 2009-12-02 | 2010-05-26 | 海洋王照明科技股份有限公司 | Over-voltage lockout protection circuit and LED drive circuit using same |
| CN201937248U (en) * | 2010-12-22 | 2011-08-17 | 四川长虹电器股份有限公司 | Self-locking protective circuit for switch power supply |
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
Non-Patent Citations (1)
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| 煤矿用本质安全型LED照明灯本安电路的设计;孙建领;《煤矿机械》;20091031;第30卷(第10期);第18-20页 * |
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