CN104218518A - 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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- CN104218518A CN104218518A CN201310211114.6A CN201310211114A CN104218518A CN 104218518 A CN104218518 A CN 104218518A CN 201310211114 A CN201310211114 A CN 201310211114A CN 104218518 A CN104218518 A CN 104218518A
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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 protective circuit field, particularly a kind of power circuit and light fixture thereof needing over-current over-voltage protection function.
Background technology
Need to use Switching Power Supply, if its output exists overcurrent-overvoltage phenomenon will damage circuit in a lot of circuit at present.So must overcurrent-overvoltage protecting circuit be added.
In view of this, a kind of overcurrent-overvoltage protecting circuit and light fixture thereof is inventor provided.
Summary of the invention
For defect of the prior art, the invention provides a kind of overcurrent-overvoltage protecting circuit and light fixture thereof, overcome the difficulty of prior art, solve overcurrent-overvoltage problem with simple circuit, promote the reliability of circuit.
According to an aspect of the present invention, a kind of overcurrent-overvoltage protecting circuit of light fixture is provided, described light fixture also comprises a light-sensitive device, a control end and a power circuit unit, described light-sensitive device couples described control end, described control end controls shutoff or the conducting of the output of described power circuit unit, it is characterized in that, described overcurrent-overvoltage protecting circuit comprises: one first resistance, one second resistance, one the 3rd resistance, one the 4th resistance, a PNP type triode, a voltage stabilizing didoe and a luminescent device;
The emitter of described PNP type triode couples one end of described first resistance and the output of described power circuit, base stage couples one end of described second resistance, and the collector electrode of described PNP type triode couples the positive pole of described voltage stabilizing didoe, one end of described 3rd resistance and one end of described 4th resistance;
The other end ground connection respectively of the other end of described first resistance, the negative pole of described voltage stabilizing didoe and described second resistance;
The other end of described 3rd resistance is by described luminescent device ground connection;
The other end ground connection of described 4th resistance;
Described luminescent device couples light to described light-sensitive device and forms a photoelectric coupled device.
Preferably, described luminescent device is a light-emitting diode, and the positive pole of described light-emitting diode couples described 3rd resistance, minus earth.
Preferably, described light-sensitive device is photodiode or phototriode.
Preferably, when described first resistance overcurrent and described PNP type triode base stage to the voltage difference of emitter is greater than 0.7V time, described PNP type triode conducting, described luminescent device is lit, described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
Preferably, when described first resistance overvoltage and described voltage stabilizing didoe is breakdown time, described luminescent device is lit, and described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
Preferably, described power circuit unit comprises a pulse width modulation chip, one output pin of described pulse width modulation chip is coupled to the output of described power circuit unit, described output pin provides the voltage of described output, and described control end controls shutoff or the conducting of the output pin of described pulse width modulation chip.
According to another aspect of the present invention, a kind of light fixture is also provided, comprise an overcurrent-overvoltage protecting circuit, a light-sensitive device, a control end and a power circuit unit, described light-sensitive device couples described control end, described control end controls shutoff or the conducting of the output of described power circuit unit, and described overcurrent-overvoltage protecting circuit comprises: one first resistance, one second resistance, one the 3rd resistance, one the 4th resistance, a PNP type triode, a voltage stabilizing didoe and a luminescent device;
The emitter of described PNP type triode couples one end of described first resistance and the output of described power circuit, base stage couples one end of described second resistance, and the collector electrode of described PNP type triode couples the positive pole of described voltage stabilizing didoe, one end of described 3rd resistance and one end of described 4th resistance;
The other end ground connection respectively of the other end of described first resistance, the negative pole of described voltage stabilizing didoe and described second resistance;
The other end of described 3rd resistance is by described luminescent device ground connection;
The other end ground connection of described 4th resistance;
Described luminescent device couples light to described light-sensitive device and forms a photoelectric coupled device;
Described luminescent device is a light-emitting diode, and the positive pole of described light-emitting diode couples described 3rd resistance, minus earth;
Described light-sensitive device is photodiode or phototriode.
Preferably, when described first resistance overcurrent and described PNP type triode base stage to the voltage difference of emitter is greater than 0.7V time, described PNP type triode conducting, described luminescent device is lit, described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
Preferably, when described first resistance overvoltage and described voltage stabilizing didoe is breakdown time, described luminescent device is lit, and described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
Preferably, described power circuit unit comprises a pulse width modulation chip, one output pin of described pulse width modulation chip is coupled to the output of described power circuit unit, described output pin provides the voltage of described output, and described control end controls shutoff or the conducting of the output pin of described pulse width modulation chip.
Compared with prior art, owing to employing above technology, overcurrent-overvoltage protecting circuit of the present invention and Design of Luminaires is simple and reliable, low cost, working stability, is suitable as protective circuit and is applied in various constant-current drive circuit.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 illustrates according to a specific embodiment of the present invention, the circuit theory diagrams of light fixture of the present invention.
Reference numeral
1 first resistance
2 second resistance
3 the 3rd resistance
4 the 4th resistance
5 PNP type triode
6 voltage stabilizing didoes
7 photoelectric coupled devices
71 luminescent devices
72 light-sensitive devices
8 pulse width modulation chips
10 power circuit unit
11 outputs
12 control ends
13 output pins
100 overcurrent-overvoltage protecting circuits
Embodiment
It will be appreciated by those skilled in the art that those skilled in the art can realize change case in conjunction with prior art and above-described embodiment, do not repeat them here.Such change case does not affect flesh and blood of the present invention, does not repeat them here.
Fig. 1 illustrates according to a specific embodiment of the present invention, the circuit theory diagrams of light fixture of the present invention.As shown in Figure 1; a kind of light fixture of the present invention; comprise overcurrent-overvoltage protecting circuit 100, light-sensitive device 72, control end 12 and a power circuit unit 10; light-sensitive device 72 couples control end 12; control end 12 controls shutoff or the conducting of the output 11 of power circuit unit 10, and overcurrent-overvoltage protecting circuit 100 comprises: one first resistance 1,1 second resistance 2,1 the 3rd resistance 3,1 the 4th resistance 4, one PNP type triode 5, voltage stabilizing didoe 6 and a luminescent device 71.
The emitter of PNP type triode 5 couples one end of the first resistance 1 and the output 11 of power circuit, base stage couples one end of the second resistance 2, and the collector electrode of PNP type triode 5 couples the positive pole of voltage stabilizing didoe 6, one end of the 3rd resistance 3 and one end of the 4th resistance 4.
The other end ground connection respectively of the other end of the first resistance 1, the negative pole of voltage stabilizing didoe 6 and the second resistance 2.
The other end of the 3rd resistance 3 is by luminescent device 71 ground connection.
The other end ground connection of the 4th resistance 4.
Luminescent device 71 couples light to light-sensitive device 72 and forms a photoelectric coupled device 7.
Luminescent device 71 is light-emitting diodes, and the positive pole of light-emitting diode couples the 3rd resistance 3, minus earth.
Light-sensitive device 72 is photodiode or phototriode.
Power circuit unit 10 comprises a pulse width modulation chip 8, and an output pin 13 of pulse width modulation chip 8 is coupled to the output 11 of power circuit unit 10, the shutoff of the output pin 13 of control end 12 control impuls width modulated chip 8 or conducting.
When the first resistance 1 overcurrent and PNP type triode 5 base stage to the voltage difference of emitter is greater than 0.7V time, PNP type triode 5 conducting, luminescent device 71 is lit, light-sensitive device 72 optocoupler exports the control end 12 of high pressure to power circuit unit 10, and control end 12 controls shutoff or the conducting of the output pin 13 of pulse width modulation chip 8 in power circuit unit 10.
When the first resistance 1 overvoltage and voltage stabilizing didoe 6 is breakdown time, luminescent device 71 is lit, light-sensitive device 72 optocoupler exports the control end 12 of high pressure to power circuit unit 10, and control end 12 controls shutoff or the conducting of the output pin 13 of pulse width modulation chip 8 in power circuit unit 10.
Such as: the constant-current drive circuit of power circuit unit 10 to be output parameters be 18V/600mA.When the electric current of output 11 is more than 600mA, the resistance of the first resistance is 0.1 Ω, pressure drop is thereon 0.6V, when there are overcurrent or short circuit abnormal conditions in load unit 8, the pressure drop of the first resistance 1 reaches 0.7V, just make PNP type triode 5 conducting, voltage is through the 3rd resistance 3 and luminescent device 71, luminescent device 71(1.2V pressure drop) optocoupler output HIGH voltage is to control end 12, control end 12 closes the output of the output pin 13 of pulse width modulation chip 8, thus the output 11 of power cutoff circuit unit 10, realize over-voltage protecting function, when protection load unit 8 is abnormal, circuit is not damaged.
The state of the overvoltage protection of overcurrent-overvoltage protecting circuit of the present invention is as follows: when overvoltage appears in the output 11 of power circuit unit 10; impel voltage stabilizing didoe 6 breakdown; then voltage is through voltage stabilizing didoe 6, the 3rd resistance 3; light-emitting diode 71 in photoelectric coupled device 7 is lighted; the high pressure of the photosensitive output of light-sensitive device 71 is to control end 12; control end 12 closes the output of the output pin 13 of pulse width modulation chip 8; thus the output 11 of power cutoff circuit unit 10; realize over-voltage protecting function, when protection load unit 8 is abnormal, circuit is not damaged.The 3rd resistance 3 wherein can select value according to actual design, also can cancel.
Such as: the constant-current drive circuit of power circuit unit 10 to be output parameters be 18V/600mA.The voltage of voltage stabilizing didoe is 18V, the resistance of the second resistance is 100 Ω, the resistance of the 3rd resistance is 200 Ω, the resistance of the 4th resistance is 2.2k Ω.Be 18V by the value of the voltage to voltage stabilizing didoe, then over-voltage protection point is set to 18+1.2 basic settings at about 20V.As the super many 20V of the voltage of output 11, this circuit will realize above-mentioned over-voltage protecting function.
Obviously, contained overcurrent-overvoltage protecting circuit 100 in the circuit theory diagrams of light fixture as shown in Figure 1, therefore the structure of overcurrent-overvoltage protecting circuit and principle repeat no more.
In summary, overcurrent-overvoltage protecting circuit of the present invention and Design of Luminaires is simple and reliable, low cost, working stability, is suitable as protective circuit and is applied in various constant-current drive circuit.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. the overcurrent-overvoltage protecting circuit of a light fixture, described light fixture also comprises a light-sensitive device, a control end and a power circuit unit, described light-sensitive device couples described control end, described control end controls shutoff or the conducting of the output of described power circuit unit, it is characterized in that, described overcurrent-overvoltage protecting circuit comprises: one first resistance, one second resistance, one the 3rd resistance, one the 4th resistance, a PNP type triode, a voltage stabilizing didoe and a luminescent device;
The emitter of described PNP type triode couples one end of described first resistance and the output of described power circuit, base stage couples one end of described second resistance, and the collector electrode of described PNP type triode couples the positive pole of described voltage stabilizing didoe, one end of described 3rd resistance and one end of described 4th resistance;
The other end ground connection respectively of the other end of described first resistance, the negative pole of described voltage stabilizing didoe and described second resistance;
The other end of described 3rd resistance is by described luminescent device ground connection;
The other end ground connection of described 4th resistance;
Described luminescent device couples light to described light-sensitive device and forms a photoelectric coupled device.
2. overcurrent-overvoltage protecting circuit as claimed in claim 1, it is characterized in that: described luminescent device is a light-emitting diode, the positive pole of described light-emitting diode couples described 3rd resistance, minus earth.
3. overcurrent-overvoltage protecting circuit as claimed in claim 2, is characterized in that: described light-sensitive device is photodiode or phototriode.
4. overcurrent-overvoltage protecting circuit as claimed in claim 3; it is characterized in that: when described first resistance overcurrent and described PNP type triode base stage to the voltage difference of emitter is greater than 0.7V time; described PNP type triode conducting; described luminescent device is lit; described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
5. overcurrent-overvoltage protecting circuit as claimed in claim 3; it is characterized in that: when described first resistance overvoltage and described voltage stabilizing didoe is breakdown time; described luminescent device is lit; described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
6. overcurrent-overvoltage protecting circuit as claimed in claim 5; it is characterized in that: described power circuit unit comprises a pulse width modulation chip; one output pin of described pulse width modulation chip is coupled to the output of described power circuit unit; described output pin provides the voltage of described output, and described control end controls shutoff or the conducting of the output pin of described pulse width modulation chip.
7. a light fixture, comprise an overcurrent-overvoltage protecting circuit, a light-sensitive device, a control end and a power circuit unit, described light-sensitive device couples described control end, described control end controls shutoff or the conducting of the output of described power circuit unit, it is characterized in that, described overcurrent-overvoltage protecting circuit comprises: one first resistance, one second resistance, one the 3rd resistance, one the 4th resistance, a PNP type triode, a voltage stabilizing didoe and a luminescent device;
The emitter of described PNP type triode couples one end of described first resistance and the output of described power circuit, base stage couples one end of described second resistance, and the collector electrode of described PNP type triode couples the positive pole of described voltage stabilizing didoe, one end of described 3rd resistance and one end of described 4th resistance;
The other end ground connection respectively of the other end of described first resistance, the negative pole of described voltage stabilizing didoe and described second resistance;
The other end of described 3rd resistance is by described luminescent device ground connection;
The other end ground connection of described 4th resistance;
Described luminescent device couples light to described light-sensitive device and forms a photoelectric coupled device;
Described luminescent device is a light-emitting diode, and the positive pole of described light-emitting diode couples described 3rd resistance, minus earth;
Described light-sensitive device is photodiode or phototriode.
8. light fixture as claimed in claim 7, it is characterized in that: when described first resistance overcurrent and described PNP type triode base stage to the voltage difference of emitter is greater than 0.7V time, described PNP type triode conducting, described luminescent device is lit, described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
9. light fixture as claimed in claim 7, it is characterized in that: when described first resistance overvoltage and described voltage stabilizing didoe is breakdown time, described luminescent device is lit, described light-sensitive device optocoupler exports the control end of high pressure to described power circuit unit, and the output that described control end controls described power circuit unit turns off.
10. light fixture as claimed in claim 7, it is characterized in that: described power circuit unit comprises a pulse width modulation chip, one output pin of described pulse width modulation chip is coupled to the output of described power circuit unit, described output pin provides the voltage of described output, and described control end controls shutoff or the conducting of the output pin of described pulse width modulation chip.
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 true CN104218518A (en) | 2014-12-17 |
| CN104218518B CN104218518B (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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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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| CN (1) | CN104218518B (en) |
Cited By (3)
| 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系统有限公司 | Automatic circuit overload or short circuit protection device |
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| 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 |
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| US20090161278A1 (en) * | 2007-12-19 | 2009-06-25 | Hon Hai Precision Industry Co., Ltd. | Short-circuit protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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系统有限公司 | Automatic circuit overload or short circuit protection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104218518B (en) | 2017-02-22 |
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