CN204741166U - Sharp light controlling circuit that power is adjustable - Google Patents
Sharp light controlling circuit that power is adjustable Download PDFInfo
- Publication number
- CN204741166U CN204741166U CN201520384261.8U CN201520384261U CN204741166U CN 204741166 U CN204741166 U CN 204741166U CN 201520384261 U CN201520384261 U CN 201520384261U CN 204741166 U CN204741166 U CN 204741166U
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- power
- circuit
- comparison amplifier
- adjustable
- photodiode
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Abstract
The utility model discloses a sharp light controlling circuit that power is adjustable has used more amplifier in order to solve the circuit, increases the loss of circuit, aims at providing a sharp light controlling circuit that power is adjustable who reduces the consumption, and its technical scheme main points only adopt single comparison amplifier, matches with it through the peripheral circuit, realizes that power is adjustable, the purpose of firm output, the utility model is suitable for a swash light controlling circuit technical field.
Description
Technical field
The utility model relates to a kind of laser control circuit technical field, and more particularly, it relates to a kind of power adjustable laser control circuit.
Background technology
Stable laser module is as core light source in the systems such as laser level, rangefinder, scanner, and requirement can send the continuous type and/or impulse type light signal that stability is high, luminous power is adjustable.The performance of the laser not only directly resistance to overturning of influential system and useful life, also can affect to certainty of measurement and sensitivity simultaneously.
According to the operation principle of semiconductor laser, usually adopt the circuit based on current source to carry out drive laser, mainly comprise constant current and invariable power two kinds of working methods:
In constant current working method, pass through current feedback control loop, accurately can control laser drive current, but because laser exists light decay characteristic, use in the environment that radiating condition is general, its Output optical power sharply declines along with the rising of temperature and even turns off the light, even if driving current constant, luminous power also cannot be constant.In addition, the generation in comparison with voltage source, the more difficult realization of generation of current source especially pulse current source, program dynamic response is poor, driving force is poor, temperature characterisitic is poor, power consumption is large.
In invariable power working method, by being arranged on the optical output power of the photodiode monitor laser of exiting surface after laser, and feed back to driven with current sources circuit, when optical output power declines, drive current increases, and vice versa, finally makes optical output power constant.Affect the fluctuation because have light source voltage or electric current of light output stability, aging, the extraneous veiling glare of circuit element, ambient temperature and light source self deterioration etc.For the control of light source light power, the method generally adopted at present is provided drive current by Precision Current Component, carried out thermostatic control with refrigerator simultaneously, thus realizing the stable output of light source light power, program control precision is low, very flexible, system are huge, cost is high, long-time stability are poor.
At present, (application number is that the Chinese patent of CN201410480976.3 discloses a kind of laser power control circuit) on market, it is made up of the first operational amplifier A, the second comparison amplifier B, a NPN triode Q1, input circuit and reference circuit.Although this circuit achieves the control to laser power, but be the use of more amplifier, therefore each components and parts are the losses that can increase circuit, particularly adopt the circuit that multiple amplifier is formed, the power consumption of step-down amplifier is a technical barrier needing to solve, in order to the power loss making circuit can reduce self, therefore need to make further improvements circuit design.
Utility model content
For the deficiency that prior art exists, it is simple that the purpose of this utility model is to provide a kind of circuit structure, and own power loss is low, the power adjustable laser control circuit adjustable to the power output of laser.
For achieving the above object, the utility model provides following technical scheme: a kind of power adjustable laser control circuit, comprise comparison amplifier, laser diode, photodiode, reference circuit, PNP triode and input power, described reference circuit comprises three terminal regulator and potentiometer;
First pin of described three terminal regulator is connected with tripod, and crus secunda ground connection is connected with input power after tripod is coupled with the first resistance;
The tripod of described potentiometer is connected with the tripod of three terminal regulator, crus secunda ground connection, and the first pin is connected to provide reference voltage with the end of oppisite phase of comparison amplifier;
Be parallel with adjustable condenser between the end of oppisite phase of described comparison amplifier and output, in-phase end is connected with the anode of photodiode;
The minus earth of described photodiode, photodiode is parallel with feedback resistance;
Be connected with the output of comparison amplifier after the base stage of described PNP triode is coupled with the 4th resistance, emitter is connected with input power after being coupled with the second resistance, and collector electrode is connected with the anode of laser diode;
The minus earth of laser diode.
Preferably, the model of described comparison amplifier is MCP6001.
Preferably, the model of described three terminal regulator is TL431.
Preferably, the output of described comparison amplifier is coupled with LED light, and described LED light is in order to operating state.
Compared with prior art, the beneficial effects of the utility model are: by the redesign of circuit and planning, adopt one to compare amplifying circuit and peripheral components and achieve power adjustments to laser, and simultaneously due to few than in prior art circuits of components and parts, the power loss of self of circuit is reduced greatly, simultaneously and circuit more simple, be easy to manufacture, be convenient to universal and application.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the utility model power adjustable laser control circuit embodiment.
U1, comparison amplifier in figure; LD, laser diode; Q1, photodiode; U2, three terminal regulator; R3, potentiometer; Q2, PNP triode; Vcc, input power; 1, reference circuit.
Embodiment
With reference to Fig. 1, the utility model power adjustable laser control circuit embodiment is described further.
A kind of power adjustable laser control circuit, comprise a comparison amplifier U1U1, laser diode LD, photodiode Q1, reference circuit 1, PNP triode Q2 and input power Vcc, described reference circuit 1 comprises three terminal regulator U2 and potentiometer R3; First pin of described three terminal regulator U2 is connected with tripod, crus secunda ground connection, and tripod is connected with input power Vcc by the first resistance R1; The tripod of described potentiometer R3 is connected with the tripod of three terminal regulator U2, crus secunda ground connection, and the first pin is connected to provide reference voltage with the end of oppisite phase of comparison amplifier U1; Be parallel with adjustable condenser C2 between the end of oppisite phase of described comparison amplifier U1 and output, in-phase end is connected with the anode of photodiode Q1; The minus earth of described photodiode Q1, photodiode Q1 is parallel with feedback resistance R5; The base stage of described PNP triode Q2 is connected with the output of comparison amplifier U1 by the 4th resistance R4, and emitter is connected with input power Vcc by the second resistance R2, and collector electrode is connected with the anode of laser diode LD; The minus earth of laser diode LD.
The model of comparison amplifier U1 is MCP6001, the model of laser is DL-3147, laser internal structure is a laser diode LD and a photodiode, laser diode LD described above and photodiode Q1 are jointly packaged together and constitute a laser, reference circuit 1 mainly provides product to examine voltage, the voltage of described input power Vcc is 3.3V, and the model of described three terminal regulator U2 is TL431.As shown in Figure 1, input power Vcc is by the first resistance R1 dividing potential drop, make the tripod of three terminal regulator U2 export 2.5V voltage by three terminal regulator U2 simultaneously, and the input voltage of the end of oppisite phase of reference circuit 1 couple of comparison amplifier U1 can be regulated by the potentiometer R3 of 10K, and the capacitance value range of tunable capacitor C2 is that 100pf is adjustable, by the adjustment to potentiometer R3 and tunable capacitor C2, the output multiplication factor of comparison amplifier U1 can be regulated, the power of laser can be regulated.Finally, the output of comparison amplifier U1 makes the electric current of the laser diode LD be connected in PNP triode by the time to control by the amplification of PNP triode, the power of laser diode LD is controlled by controlling its Current amplifier, and photodiode Q1 can the luminous intensity of detection laser diode LD, when laser diode LD luminescence is stronger, then photodiode Q1 to respond to after light intensity the resistance decreasing of self, make the 5th resistance R5 point position step-down simultaneously, at the voltage of the in-phase input end of comparison amplifier U1 also with regard to step-down, the control to laser diode LD electric current is made by the mode of negative-feedback regu-lation, control the power of laser diode LD simultaneously, the power of laser diode LD is made to remain on stable state.Owing to have employed a comparison amplifier U1, the loss of circuit integrity is reduced greatly, achieved the constant power output of laser by simple peripheral circuit simultaneously, the power output of laser can be regulated by change potentiometer R3 and variable capacitance simultaneously, circuit is practical, simple, easily manufactures.
LED is connected with in one end of resistance R4, circuit can be used to refer to by LED whether to work, when comparison amplifier U1 export be high level time, electric current is by LED1 indicator light, make LED luminous, when circuit is idle time, do not have electric current to flow through indicator light LED1, LED is not luminous, thus can the operating state of clearly decision circuitry.Simultaneously when resistance R4 holds generation open circuit conditions time, LED1 will extinguish, thus can know that circuit is in malfunction, and when circuit is in running order time, LED1 lights.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (4)
1. a power adjustable laser control circuit, is characterized in that: comprise comparison amplifier, laser diode, photodiode, reference circuit, PNP triode and input power, and described reference circuit comprises three terminal regulator and potentiometer;
First pin of described three terminal regulator is connected with tripod, and crus secunda ground connection is connected with input power after tripod is coupled with the first resistance;
The tripod of described potentiometer is connected with the tripod of three terminal regulator, crus secunda ground connection, and the first pin is connected to provide reference voltage with the end of oppisite phase of comparison amplifier;
Be parallel with adjustable condenser between the end of oppisite phase of described comparison amplifier and output, in-phase end is connected with the anode of photodiode;
The minus earth of described photodiode, photodiode is parallel with feedback resistance;
Be connected with the output of comparison amplifier after the base stage of described PNP triode is coupled with the 4th resistance, emitter is connected with input power after being coupled with the second resistance, and collector electrode is connected with the anode of laser diode;
The minus earth of laser diode.
2. power adjustable laser control circuit according to claim 1, is characterized in that: the model of described comparison amplifier is MCP6001.
3. power adjustable laser control circuit according to claim 2, is characterized in that: the model of described three terminal regulator is TL431.
4. power adjustable laser control circuit according to claim 3, it is characterized in that: the output of described comparison amplifier is coupled with LED light, described LED light is in order to operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520384261.8U CN204741166U (en) | 2015-06-04 | 2015-06-04 | Sharp light controlling circuit that power is adjustable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520384261.8U CN204741166U (en) | 2015-06-04 | 2015-06-04 | Sharp light controlling circuit that power is adjustable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204741166U true CN204741166U (en) | 2015-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520384261.8U Expired - Fee Related CN204741166U (en) | 2015-06-04 | 2015-06-04 | Sharp light controlling circuit that power is adjustable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204741166U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759887A (en) * | 2015-12-07 | 2016-07-13 | 重庆川仪自动化股份有限公司 | Current output circuit in flowmeter checking equipment |
| CN108847572A (en) * | 2018-05-28 | 2018-11-20 | 深圳瑞波光电子有限公司 | A kind of power supply unit and constant-current source of semiconductor laser |
| CN111600196A (en) * | 2020-05-22 | 2020-08-28 | 索尔思光电（成都）有限公司 | Multi-channel low-power-consumption APC control circuit and method for laser forward voltage |
| CN116979369A (en) * | 2023-09-25 | 2023-10-31 | 成都派斯光科技有限公司 | Laser driving circuit and method for particulate matter concentration sensor |
-
2015
- 2015-06-04 CN CN201520384261.8U patent/CN204741166U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759887A (en) * | 2015-12-07 | 2016-07-13 | 重庆川仪自动化股份有限公司 | Current output circuit in flowmeter checking equipment |
| CN108847572A (en) * | 2018-05-28 | 2018-11-20 | 深圳瑞波光电子有限公司 | A kind of power supply unit and constant-current source of semiconductor laser |
| CN111600196A (en) * | 2020-05-22 | 2020-08-28 | 索尔思光电（成都）有限公司 | Multi-channel low-power-consumption APC control circuit and method for laser forward voltage |
| CN111600196B (en) * | 2020-05-22 | 2023-04-25 | 索尔思光电（成都）有限公司 | Multichannel low-power-consumption APC control circuit and method for forward voltage of laser |
| CN116979369A (en) * | 2023-09-25 | 2023-10-31 | 成都派斯光科技有限公司 | Laser driving circuit and method for particulate matter concentration sensor |
| CN116979369B (en) * | 2023-09-25 | 2023-12-08 | 成都派斯光科技有限公司 | Laser driving circuit and method for particulate matter concentration sensor |
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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: 20151104 Termination date: 20180604 |