CN1389964A - Power controlling circuit - Google Patents
Power controlling circuit Download PDFInfo
- Publication number
- CN1389964A CN1389964A CN01129828A CN01129828A CN1389964A CN 1389964 A CN1389964 A CN 1389964A CN 01129828 A CN01129828 A CN 01129828A CN 01129828 A CN01129828 A CN 01129828A CN 1389964 A CN1389964 A CN 1389964A
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- Prior art keywords
- circuit
- laser diode
- current
- power control
- integrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses the optical power control circuit suitable to the application and measurement of the laser diode. The digital potentiometer possessing the SPI bus interface is connected to the feedback loop in order to realize the intelligent controlling the laser diode by the singlechip. The circuit consists of the integrating circuit, the driving circuit, the circuit for testing the input and output current of the laser diode, the digital potentiometer and the switching circuit. Comparing with the control mode using D/A converter in the prior art, the invented method provides the advantages of the strong expansibility, good interference immunity and anti power-supply fluctuation.
Description
Technical field:
The present invention relates to a kind of power control circuit, it is applicable to the application of laser diode and the luminous power control when detecting.
Background technology:
When application and detection laser diode, need make change to the pipe power output at present, this change is regulated by staff, and operating efficiency is not high, is difficult to industrialized typical products in mass production is carried out simultaneously.And, for large batch of product, need the power control circuit of multichannel, if adopt the D/A mode, need a large amount of D/A conversion, analog switch to switch, its circuit complexity, with high costs, and poor reliability.
Technical scheme:
The object of the present invention is to provide a kind of optical power control circuit, can use, realize automatic regulation in application and detection to laser diode at laser diode.The present invention can realize like this: a kind of power control circuit, form by integrating circuit, drive circuit, laser diode input and output current detection circuit, digital regulation resistance and switching circuit.Wherein, described integrating circuit is connected between interior receiving-member of laser diode and the described drive circuit, the contact of integrating circuit and drive circuit is connected with switching circuit between the ground, in laser diode, be connected to simultaneously between receiving-member and the ground and be connected in series digital regulation resistance and Im current detection circuit, digital regulation resistance has the spi bus interface, drive circuit is connected with the I of detection laser diode current when providing operating current for laser diode
OPCurrent detection circuit.
Operation principle: entire circuit is a negative-feedback circuit, the feedback current filtering that integrating circuit produces receiving-member in the laser diode, remove clutter interference, the signal of guaranteeing to control laser diode is pure direct current, finishes the setting of laser diode driver circuit bias current simultaneously.Feedback signal behind integral filtering is added in the input of drive circuit, to produce the electric current of enough driving laser led lightings.When the switch closure in the switching circuit, drive circuit be input as 0, promptly do not produce output current, laser diode is not luminous.Digital regulation resistance is accepted the control of single-chip microcomputer by spi bus, thereby realizes the intelligent regulatory function of entire circuit.
Description of drawings:
The present invention is further described below by drawings and Examples.
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is a circuit diagram of the present invention;
Fig. 3 is the comparison diagram that single laser diode is used the present invention front and back;
Fig. 4 is the comparison diagram that a plurality of laser diodes are used the present invention front and back.
Specific embodiment:
As shown in Figure 1, 2, the described power control circuit of present embodiment is made up of integrating circuit 1, drive circuit 2, current detection circuit 3, digital regulation resistance R25 and switching circuit 4, LD represents to be connected to the input of laser diode among the figure, and PD represents to be connected to the receiving-member of laser diode, wherein:
Switching circuit 4 is connected between the contact and ground of integrating circuit 1 and drive circuit 2, is a parallel circuits.When the switch s2 in the switching circuit 4 disconnected, by switching circuit 4 short circuits, the input of drive circuit 2 was 0 from the electric current of integrating circuit 1; Otherwise when switch s2 was closed, electric current flowed into drive circuit 1 and makes its work;
In laser diode, be connected in series digital regulation resistance R25 and Im current detection circuit between receiving-member and the ground simultaneously in regular turn, digital regulation resistance R25 adopts the AD5204 of Analog Devices Inc, tool spi bus interface, controlled by external microcontroller, can change the resistance size of its resistance by single-chip microcomputer, to realize Based Intelligent Control to laser diode LD in the circuit; The Im current detection circuit picks up the size of current of digital regulation resistance R25;
The course of work of entire circuit is the output services electric current I of drive circuit 2
OPFor laser diode LD work, the light that is sent is received by the receiving-member of monitoring luminous power in the laser diode LD, produce photoelectric current Im, feed back to integrating circuit 1 in this circuit as its input current, integrating circuit 1 is output as the bias current of drive circuit 2.
External microcontroller has also just changed the size of photoelectric current Im, thereby has realized the operating current I to laser diode LD indirectly by the size of digital regulation resistance R25 on the spi bus change feedback loop
OPAdjusting.The output variable I of this circuit
OPWith feedback quantity Im by I
OPCurrent detection circuit and Im current detection circuit detect and are subjected to the real-time monitoring of external microcontroller.
During this circuit working, laser diode LD can be operated in three kinds of operating states respectively as required: permanent merit, constant current and scanning, 1. when laser diode works in permanent merit mode, the photoelectric current Im that utilizes the receiving-member in the pipe to produce realizes negative feedback, stablize the optical output power that pipe produces, when if optical power change exceeds the permissible error scope, then regulate the size of digital regulation resistance R25 by single-chip microcomputer, power is recalled to set point; 2. when laser diode worked in current constant mode, the receiving-member in the pipe did not use, only by single-chip microcomputer monitoring electric current I at any time
Op,, regulate back set point if electric current is variant; 3. when laser diode works in scan mode, the receiving-member in the pipe does not use, single-chip microcomputer periodically the value of digital regulation resistance R25 by reducing greatly, can realize the periodicity gradual change of light output amplitude, i.e. scanning.
Digital regulation resistance R25 adopts SPI universal serial bus (serial data line MISO, MOSI and serial time clock line SCK) with being connected of external microcontroller.
After in the application of laser diode and checkout equipment, adopting foregoing circuit, the visible Fig. 3 of difference and Fig. 4 before it does not more use, traditional control mode must adopt digital to analog converter, is the control that could realize after the analog quantity the laser diode output variable with the digital signal transition of single-chip microcomputer.
After adopting circuit of the present invention, its advantage has:
1, autgmentability is strong. When the multichannel power control circuit is worked simultaneously, if adopt traditional approach, need A large amount of digital to analog converters and analog switch switch each road power control circuit, and circuit is extremely complicated, and becomes This costliness, poor reliability. After using the present invention, only need to be with the spi bus of three lines and the choosing of sheet separately Signal is connected to each power control circuit unit, road, and circuit is simple and clear, and reliability is strong, and cost is low.
2, anti-interference is good. Use digital to analog converter, its output line can not be oversize, otherwise can respond to too many Interfering signal. And be data signal in the spi bus that the present invention adopts, and not being afraid of interference, can pass Defeated long distance.
3, anti-power-supply fluctuation.Because this circuit bias circuit band voltage stabilizing, guaranteed that the integrator output current is not subjected to the influence of mains voltage variations, avoided following the phenomenon of change, stopped to burn the accident of laser diode LD because of power source change because of mains voltage variations causes the power output of laser diode LD.
Claims (1)
1, a kind ofly be used for that laser diode detects and the power control circuit of luminous power control when using, comprise an integrating circuit, a drive circuit, two current detection circuits and a switching circuit, it is characterized in that described power control circuit also comprises digital regulation resistance, wherein, described integrating circuit is connected between interior receiving-member of laser diode and the described drive circuit, the contact of this integrating circuit and described drive circuit is connected with switching circuit between the ground, in laser diode, be connected to described digital regulation resistance and Im current detection circuit between receiving-member and the ground simultaneously, described digital regulation resistance has the spi bus interface, described drive circuit is connected with the I of detection laser diode current when providing operating current for laser diode
OPCurrent detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011298286A CN1148850C (en) | 2001-10-26 | 2001-10-26 | Power controlling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011298286A CN1148850C (en) | 2001-10-26 | 2001-10-26 | Power controlling circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1389964A true CN1389964A (en) | 2003-01-08 |
| CN1148850C CN1148850C (en) | 2004-05-05 |
Family
ID=4669483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011298286A Expired - Fee Related CN1148850C (en) | 2001-10-26 | 2001-10-26 | Power controlling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1148850C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507000A (en) * | 2011-10-10 | 2012-06-20 | 武汉华工激光工程有限责任公司 | Detection circuit for output laser energy of laser welding machine |
| CN102576978A (en) * | 2009-10-26 | 2012-07-11 | 三菱电机株式会社 | Light source driving device, light source driving method, and image display device |
| CN105813344A (en) * | 2015-01-03 | 2016-07-27 | 珠海天启技术有限公司 | Optical module lighting power control system and control method therefor |
| CN114089149A (en) * | 2022-01-21 | 2022-02-25 | 成都明夷电子科技有限公司 | System and method for testing automatic power control function of optical communication laser driver |
-
2001
- 2001-10-26 CN CNB011298286A patent/CN1148850C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576978A (en) * | 2009-10-26 | 2012-07-11 | 三菱电机株式会社 | Light source driving device, light source driving method, and image display device |
| CN102576978B (en) * | 2009-10-26 | 2014-07-16 | 三菱电机株式会社 | Light source driving device, light source driving method, and image display device |
| US9235109B2 (en) | 2009-10-26 | 2016-01-12 | Mitsubishi Electric Corporation | Light source driving device, light source driving method, and image display device |
| CN102507000A (en) * | 2011-10-10 | 2012-06-20 | 武汉华工激光工程有限责任公司 | Detection circuit for output laser energy of laser welding machine |
| CN105813344A (en) * | 2015-01-03 | 2016-07-27 | 珠海天启技术有限公司 | Optical module lighting power control system and control method therefor |
| CN105813344B (en) * | 2015-01-03 | 2018-02-06 | 珠海天启技术有限公司 | The optical power control system and control method of a kind of optical module |
| CN114089149A (en) * | 2022-01-21 | 2022-02-25 | 成都明夷电子科技有限公司 | System and method for testing automatic power control function of optical communication laser driver |
| CN114089149B (en) * | 2022-01-21 | 2022-04-01 | 成都明夷电子科技有限公司 | System and method for testing automatic power control function of optical communication laser driver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1148850C (en) | 2004-05-05 |
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| CF01 | Termination of patent right due to non-payment of annual fee |