CN101692465B - Thermostatic control method and thermostatic control device for photodiode - Google Patents
Thermostatic control method and thermostatic control device for photodiode Download PDFInfo
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- CN101692465B CN101692465B CN200910272363XA CN200910272363A CN101692465B CN 101692465 B CN101692465 B CN 101692465B CN 200910272363X A CN200910272363X A CN 200910272363XA CN 200910272363 A CN200910272363 A CN 200910272363A CN 101692465 B CN101692465 B CN 101692465B
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Abstract
The invention relates to a thermostatic control method and a thermostatic control device for a photodiode. The thermostatic control method comprises the following steps: arranging the photodiode in a photodiode clamp, detecting the temperature of the photodiode by using a temperature sensor, converting an electrical signal of the temperature into a digital signal through an analog-to-digital converter, processing the temperature signal by a digital signal processor, controlling the output of the analog-to-digital converter by using a proportional-integral-differential incremental algorithm, controlling a pulse width modulation power driving circuit, and driving a semiconductor refrigerator to control the temperature of a photodiode module. The temperature control of the semiconductor refrigerator comprises bidirectional heating and refrigerating, the controlled temperature can be set and adjusted through an RS 232 serial interface, and the temperature can be read in real time. The whole device is a closed loop control system, can accurately control the temperature of the photodiode to ensure that the photodiode works in constant gain, and is applicable to the thermostatic control of an APD photodiode detector.
Description
Technical field
The present invention relates to a kind of photodiode constant-temperature control method and device, belong to domain of control temperature.
Background technology
Known, the photoelectricity avalanche diode applies in the photodetection usually, need be than higher sensitivity, because the gain temperature influence of himself is big, this just need carry out function of temperature compensation control to it.
At present, the photoelectricity avalanche diode is carried out temperature-compensating generally adopt the method for adjusting the photodiode bias voltage, but the outside bias voltage that provides is controlled common tens to 100V the bias voltage that needs, precision to bias voltage control also has quite high requirement, and these all need could realize by a series of complex peripheral circuit.
The patent No. is that the Chinese utility model patent of 200420034040.X discloses a kind of avalanche photodide temperature offset voltage tester equipment, boost the dress parallel operation and the bias voltage that control device such as single-chip microcomputer compensate APD is set in addition by being provided with at voltage generating unit branch, the bias voltage that can control APD makes it to change according to certain rules with temperature, can keep APD gain substantially constant like this, guarantee its operate as normal.But it is insensitive to the variations in temperature of APD only to establish boost converter, and the bias voltage that imposes on APD can produce hysteresis, causes the inaccurate and deviation of test data.
The temperature that thermistor and temperature compensation means reach the APD bias voltage can be set in addition to compensate, as the patent No. is that 200310114995.6 Chinese invention patent discloses a kind of temperature compensating device that is used for receiver of avalanche photodiode, it comprises that voltage produces part, light receiving part comprises thermistor, thermistor is used for the variations in temperature of perception APD, control section comprises temperature compensation means, it can receive the temperature data from thermistor, change the compensation slope by the size that changes the adjustable compensation resistance that links to each other with thermistor, temperature correlation performance loss to APD compensates, but there is bigger error in adjustable compensation resistance, when the APD temperature coefficient does not cause simultaneously that error is bigger, can't realize the good temperature-compensating of gamut that requires temperature range interior.
Summary of the invention
Adopt the method for control bias voltage that photodiode is carried out circuit complexity and the precision problem that temperature-compensating brought in order to overcome, purpose of the present invention just is to provide a kind of photodiode constant-temperature control method and device, can guarantee that photodiode work is in constant gain, under the very big situation of variation of ambient temperature, also temperature control accurately.
Technical scheme of the present invention is: the photodiode constant-temperature control method, comprise the steps: temperature sensor detection photodiode temperature, by analog to digital converter temperature signal is converted to digital signal, digital signal processor is handled temperature signal, it is characterized in that: utilization proportion integration differentiation delta algorithm, the output of control digital to analog converter, control pulse-width modulation power driving circuit, drive semiconductor cooler the photodiode module is carried out temperature control, the semiconductor cooler temperature control is two-way energy heating and cooling, and set adjustment control temperature by the RS232 serial interface circuit, and reading temperature in real time, whole device is a closed-loop control system.
The photodiode thermostatically-controlled equipment is characterized in that: comprise photodiode anchor clamps and temperature control card two parts, holder part is connected by flexible cord with the temperature control card; The photodiode holder part comprises photodiode anchor clamps, temperature sensor and semiconductor cooler; The temperature control card partly comprises digital signal processor, analog to digital converter, digital to analog converter, processes temperature signal circuit, pulse-width modulation power driving circuit and RS232 serial interface circuit;
In photodiode anchor clamps inside temperature sensor is set; In the photodiode clamp base semiconductor cooler is set; Temperature sensor is connected to the processes temperature signal circuit, processes temperature signal circuit connection mode number converter, digital signal processor links to each other with digital to analog converter with analog to digital converter respectively by 16 bit data bus, digital to analog converter is connected to the pulse-width modulation power driving circuit, and the pulse-width modulation power driving circuit links to each other with semiconductor cooler; The RS232 serial interface circuit links to each other with digital signal processor.
Aforesaid photodiode thermostatically-controlled equipment is characterized in that: also comprise reference voltage source, it is connected with analog to digital converter, digital to analog converter, processes temperature signal circuit and pulse-width modulation power driving circuit respectively.
The invention has the beneficial effects as follows: the present invention can make photodiode APD be operated in stationary temperature, thereby guarantee that photodiode work is in constant gain, because but semiconductor cooler has the two-way refrigerating function that heats, under the very big situation of variation of ambient temperature, temperature control accurately.
Description of drawings
Fig. 1 is the schematic block circuit diagram of embodiment of the invention device
Fig. 2 is the circuit theory diagrams of processes temperature signal circuit among Fig. 1
Fig. 3 is the circuit theory diagrams of analog to digital converter among Fig. 1
Fig. 4 .1-4.4 is the circuit theory diagrams of DSP chip TMS320F2812 among Fig. 1
Fig. 5 is the circuit theory diagrams of pulse-width modulation power driving circuit among Fig. 1
Embodiment
The present invention is described further below in conjunction with drawings and Examples.
The explanation of mark among Fig. 1: 1-digital signal processor, the 2-analog to digital converter, the 3-digital to analog converter, the 4-reference voltage source, 5-processes temperature signal circuit, 6-pulse-width modulation power driving circuit, the 7-temperature sensor, the 8-semiconductor cooler, 9-RS232 serial interface circuit, 10-photodiode anchor clamps.
As shown in Figure 1, embodiment of the invention device comprises photodiode anchor clamps and temperature control card two parts, and holder part is connected by flexible cord with the temperature control card.The photodiode holder part comprises photodiode anchor clamps 10, temperature sensor 7 and semiconductor cooler 8; The temperature control card partly comprises digital signal processor 1, analog to digital converter 2, digital to analog converter 3, reference voltage source 4, processes temperature signal circuit 5, pulse-width modulation power driving circuit 6 and RS232 serial interface circuit 9.
In APD photodiode anchor clamps 10 inside temperature sensor 7 is set; In APD anchor clamps 10 bottoms semiconductor cooler 8 is set; Temperature sensor 7 output temperature analog signal NTC are to processes temperature signal circuit 5, processes temperature signal circuit 5 output voltage signal AIN1 are to analog to digital converter 2, analog to digital converter 2 links to each other by 16 bit data bus with digital signal processor 1, digital signal processor 1 links to each other by 16 bit data bus with digital to analog converter 3, digital to analog converter 3 output voltage signal VOUTA are to pulse-width modulation power driving circuit 6, and pulse-width modulation power driving circuit 6 links to each other with semiconductor cooler 8 by TECA+, TECA-.
Processes temperature signal circuit 5 is converted into analog electrical signal with the temperature and resistance value, and 16 A/D analog to digital converters 2 are made up of the AD7656 of AD company chip, adopt 16 bit data bus, 6 road parallel samplings, high sampling rate 250K; DSP digital signal processor 1 is selected the TMS320F2812PGFA chip of TI company, dominant frequency 150M, 16 bit data bus for use; 16 D/A digital to analog converters 3 are made up of the LTC2755 of LINEAR company chip, adopt 16 bit data bus, and four the tunnel and line output; PWM pulse-width modulation power driving circuit 6 is made up of the DRV591 chip of TI company, adopts bipolarity output 5V/3A, the 250K/500K switching speed; Reference voltage source 4 circuit provide the reference voltage reference for processes temperature signal circuit 5, analog to digital converter 2, digital to analog converter 3, pulse-width modulation power driving circuit 6 etc.; RS232 serial bus interface circuit 9 can pass through serial communication with host computer.
Fig. 2 is processes temperature signal circuit 5 schematic diagrams, with the precision resistance R6 serial connection of temperature sensor 7 (NTC thermistor) by 10K, is connected to the 5V reference voltage, temperature value is converted into the voltage signal of 0～5V.C39 is a filter capacitor, and U11 is that OPA2177 makees voltage follower here, increases input impedance, improves the signal antijamming capability.
Fig. 3 is analog to digital conversion circuit 2 schematic diagrams, adopt the AD7656 chip, in the single-chip integrated 6 16, fast, low-power consumption, successive approximation type a/d C, sampling rate is 250K, 2.5V reference voltage can be produced by inside, also can be provided by the outside, C72, C73, C76, E21, E22, E23 are the coupling capacitor circuit that REFCAPA, REFCAPB, EREFCAPC arrive ground, go to disturb; U12 provides outside 2.5V reference voltage for it, VDD3.3 ,+5V, VCC ,+12V ,-12V is its power supply, SER/PARSEL manages ground connection, selects the AD chip operation in the parallel data transmission mode.
Fig. 4 is DSP digital signal processor circuit 1 schematic diagram, adopts the TMS320F2812PGFA chip of TI company, dominant frequency 150M, 32 bit data processors, 16 bit data bus, 4MB program/data addressing space, JTAG debugging interface.DSP digital signal processor circuit 1 mainly is that analog-to-digital data are converted to temperature value by the interpolation look-up table among the present invention, by pid algorithm control digital-to-analogue conversion output; Communicate by RS232 serial bus interface circuit 9 with PC.
Digital to analog converter 3 adopts the LINEAR LTC2755 of company chip, two-way I/O parallel interface, but internal register retaking of a year or grade, and 16 four-way DA outputs, output voltage range may be programmed in unipolarity and bipolarity.Control work is exported at 0～5V in the utility model.The 5V reference voltage is provided by outside U26, U27 chip.
Fig. 5 is a PWM pulse-width modulation power driving circuit schematic diagram, adopts the DRV591 chip of TI company, bipolarity output 5V/3A, and the 250K/500K switching speed, R29, C89 are for selecting PWM frequency and clock generating, and PWM is 500K here, and clock is inner the generation.U19 provides the backward end IN-input voltage of 2.5V, and 6 pin IN+ are the digital-to-analogue conversion input, and 24,25,26,27 and 14,15,16,17 pins are output interface, and L4, L5, E27, E28 are the LC filter circuit, and just output current is more stable clean.
Embodiment of the invention control method is that photodiode is installed in the photodiode anchor clamps 10, survey the photodiode temperature with temperature sensor 7 thermistors, by analog to digital converter 2 modules temperature signal is converted to digital signal, 1 pair of temperature signal of digital signal processor is handled, utilization proportion integration differentiation (being called for short PID) delta algorithm, the output of control digital to analog converter 3 modules, control pulse-width modulation power driving circuit 6, drive 8 pairs of photodiode modules of semiconductor cooler and carry out temperature control, the semiconductor cooler temperature control is that two-way heating can be freezed, and can set adjustment control temperature by RS232 serial interface circuit 9, and can read temperature in real time, whole device is a closed-loop control system, can carry out accurate temperature control to photodiode, guaranteeing photodiode work, thereby reach the purpose that photodiode can accurately be surveyed in constant gain.
Claims (3)
1. photodiode constant-temperature control method, comprise the steps: temperature sensor detection photodiode temperature, by analog to digital converter temperature signal is converted to digital signal, digital signal processor is handled temperature signal, it is characterized in that: utilization proportion integration differentiation delta algorithm, the output of control digital to analog converter, control pulse-width modulation power driving circuit, drive semiconductor cooler the photodiode module is carried out temperature control, the semiconductor cooler temperature control is two-way energy heating and cooling, and set adjustment control temperature by the RS232 serial interface circuit, and read temperature in real time, whole device is a closed-loop control system.
2. photodiode thermostatically-controlled equipment, it is characterized in that: comprise photodiode anchor clamps and temperature control card two parts, holder part is connected with the temperature control card; The photodiode holder part comprises photodiode anchor clamps, temperature sensor and semiconductor cooler; The temperature control card partly comprises digital signal processor, analog to digital converter, digital to analog converter, processes temperature signal circuit, pulse-width modulation power driving circuit and RS232 serial interface circuit;
In photodiode anchor clamps inside temperature sensor is set; In the photodiode clamp base semiconductor cooler is set; Temperature sensor is connected to the processes temperature signal circuit, processes temperature signal circuit connection mode number converter, digital signal processor links to each other with digital to analog converter with analog to digital converter respectively by data/address bus, digital to analog converter is connected to the pulse-width modulation power driving circuit, and the pulse-width modulation power driving circuit links to each other with semiconductor cooler; The RS232 serial interface circuit links to each other with digital signal processor.
3. photodiode thermostatically-controlled equipment according to claim 2 is characterized in that: also comprise reference voltage source, it is connected with analog to digital converter, digital to analog converter, processes temperature signal circuit and pulse-width modulation power driving circuit respectively.
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| CN200910272363XA CN101692465B (en) | 2009-09-30 | 2009-09-30 | Thermostatic control method and thermostatic control device for photodiode |
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| CN200910272363XA CN101692465B (en) | 2009-09-30 | 2009-09-30 | Thermostatic control method and thermostatic control device for photodiode |
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| CN101692465B true CN101692465B (en) | 2011-07-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101876833B (en) * | 2010-06-25 | 2012-05-23 | 电子科技大学 | Intelligent temperature control method for array light receiving/transmitting module in optical switch |
| ES2386732B2 (en) * | 2011-01-31 | 2013-03-13 | Universidad De Málaga | LASER RECEIVER DEVICE BASED ON THERMOREGULATED AVALANCHA PHOTODIOD WITH EMBEDDED CONTROL. |
| US9157797B2 (en) * | 2013-03-14 | 2015-10-13 | Maxim Integrated Products, Inc. | Avalanche photo diode detector control systems and method |
| CN104459502A (en) * | 2013-09-22 | 2015-03-25 | 中国振华集团永光电子有限公司 | Electrical parameter testing device and method for current regulating diodes |
| CN108445946A (en) * | 2018-04-04 | 2018-08-24 | 安徽问天量子科技股份有限公司 | The temperature self-adaptation control circuit and method of APD in quantum key dispatching system |
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