CN203133636U - Automatic temperature-control circuit and optical transceiver module including same - Google Patents
Automatic temperature-control circuit and optical transceiver module including same Download PDFInfo
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- CN203133636U CN203133636U CN 201320142722 CN201320142722U CN203133636U CN 203133636 U CN203133636 U CN 203133636U CN 201320142722 CN201320142722 CN 201320142722 CN 201320142722 U CN201320142722 U CN 201320142722U CN 203133636 U CN203133636 U CN 203133636U
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Abstract
The utility model discloses an automatic temperature-control circuit which comprises a central control unit, a switch power supply converter, a thermoelectric refrigerator and a thermistor. The thermistor feeds the temperature of a laser assembly back to the central control unit. Pins of a digit/analog converter of the central control unit are connected with feedback voltage pins of the switch power supply converter so as to control output voltage of the switch power supply converter and further to control refrigerating and heating functions of the thermoelectric refrigerator. The utility model also discloses an optical transceiver module adopting the abovementioned automatic temperature-control circuit. The switch power supply converter of the automatic temperature-control circuit works at the on-of state and is low in power consumption and high in conversion efficiency. Compared with the conventional circuit, the automatic temperature-control circuit is improved remarkably. In addition, a switch power supply is small in size, occupies a small spatial dimension of a circuit substrate, is beneficial for miniaturization design of a module, and further helps to improve port density and reduce power consumption.
Description
Technical field
The utility model relates to optical communication field, relates in particular to a kind of automatic temperature-adjusting control circuit of optical transceiver module and comprises its optical transceiver module.
Background technology
In recent years, along with the fast development of 40G/100G high-speed light network, the demand of superelevation speed optical transceiver module is increased day by day, also more and more higher to the requirement of port density and power consumption simultaneously.Optical module such as SFP+, CFP is when the length Distance Transmission, the characteristic of optical device be along with bigger variation can take place in the rising of temperature, makes the parameter such as power, wavelength of light signal change a lot, and eye pattern and the bit error rate also worsen, thereby cause the signal variation, and then influence communication performance and reliability.In order to guarantee communication quality, need to keep the luminous power, wavelength etc. of the emitting module in the optical module to keep constant relatively, thereby need to keep working temperature stable of laser instrument.Especially for DWDM(Dense Wavelength Division Multiplexing, dense wave division multipurpose) system, the operation wavelength of laser instrument need satisfy the G.692 agreement of ITU-TG.692(International Telecommunications Union (ITU) telecommunication standards group) smallest passage of regulation is spaced apart the specific wavelength requirement of 50GHz or 100GHz, thereby wavelength stability had higher requirement.
For at a high speed, the optical module of long Distance Transmission, adopt usually and be built-in with TEC(Thermoelectric cooler, thermoelectric refrigerating unit) the Laser emission assembly.Traditional automatic temperature-adjusting control circuit links to each other with thermistor, is used for the temperature constant in the maintenance laser assembly, thereby guarantees stablizing of laser works state and stablizing of output parameter.When changing owing to the influence of environment temperature or chip of laser self in the laser assembly, the resistance that is positioned at the thermistor of laser assembly shell can change along with variation of temperature, thereby can control size of current and the polarity of the temperature control equipment with two-way output by the variation of resistance value, and and then reach the constant working temperature of laser instrument by thermoelectric refrigerating unit, and maintain under this working temperature, up to again because the variation of the working temperature that variation of ambient temperature or chip of laser self temperature rise bring.Illustrate, desire to make laser works under 25 ℃ of constant temperature, when the temperature of the encapsulation shell of laser assembly during greater than 25 ℃, thermoelectric refrigerating unit adds positive bias, starts refrigerating function, promotes the decline of case temperature; When the temperature of the encapsulation shell of laser assembly during less than 25 ℃, thermoelectric refrigerating unit adds negative bias, starts heating function, promotes the rising of case temperature.
The temperature control equipment of the optical module of prior art adopts the H bridge circuit usually, change size of current and the direction of TEC by regulating the H bridge, thereby the actual temperature that guarantees laser instrument is stabilized in target temperature.Yet, adopt the H bridge circuit to have following drawback: the direct current resistance of the one, H bridge and stray capacitance, there are higher static state and dynamic power dissipation, cause efficient very low; The 2nd, for by enough big electric currents, the H bridge need be selected the electronic component of large-size for use, and this is unfavorable for the design of module size, and then is difficult to satisfy the requirement of port density and power consumption concerning the extremely limited optical module of board area very much; The price comparison costliness of the 3rd, H bridge causes the cost of optical transceiver module higher.
Summary of the invention
The utility model is in order to overcome above deficiency, proposed a kind of automatic temperature-adjusting control circuit of optical transceiver module and comprised its optical transceiver module.
Technical matters of the present utility model is solved by following technical scheme:
A kind of automatic temperature-adjusting control circuit of optical transceiver module comprises central control unit, switch power converter, thermoelectric refrigerating unit and thermistor, and described central control unit comprises analog/digital converter and digital-to-analog converter; Described thermistor one end ground connection is moved on the reference voltage and is connected on the pin of analog/digital converter of central control unit on the other end, the temperature of laser assembly is fed back to central control unit; The pin of the digital-to-analog converter of described central control unit is connected on the feedback voltage pin of switch power converter, thus the output voltage of gauge tap power supply changeover device, and then refrigeration and the heat-production functions of control thermoelectric refrigerating unit.
In an embodiment of the present utility model, described switch power converter is voltage raising and reducing type direct current (buck/boost DC/DC) switch power converter.
In an embodiment of the present utility model, the analog/digital converter of described central control unit is the analog/digital converter of 12 precision of two passages, and described digital-to-analog converter is the digital-to-analog converter of 12 precision of single channel.
In an embodiment of the present utility model, described central control unit comes the output of gauge tap power supply changeover device according to the proportional-integral-differential algorithm.
In an embodiment of the present utility model, also comprise resistance in series and flash current detector, described resistance in series one end connects thermoelectric refrigerating unit, the other end connects the voltage output end of switch power converter, described flash current detector connects the two ends of resistance in series, and be connected on the pin of analog/digital converter, the current conversion of thermoelectric refrigerating unit is voltage and feeds back to central control unit.
In an embodiment of the present utility model, the resistance of described resistance in series is 0.008 ohm to 0.05 ohm.
In an embodiment of the present utility model, also comprise comparer, the output terminal of described comparer and the feedback signal of switch power converter are interconnected, and the input end of comparer connects input supply voltage and the reference voltage of thermoelectric refrigerating unit.
The invention also discloses a kind of optical transceiver module, comprise light emission component, optical fiber receive module, circuit substrate, shell and optical fiber interface, it is characterized in that, described circuit substrate comprises aforesaid automatic temperature-adjusting control circuit.
The utility model adopts switch power converter, it is advantageous that conversion efficiency height (efficient herein can simply be regarded the ratio of power input and output power as).Switching transistor works on off state in addition, and power consumption is less, and it is lower to generate heat.Its efficient is compared the H bridge circuit and is improved significantly with power consumption.In addition, the volume of Switching Power Supply is less, and the bulk that occupies circuit substrate (PCB) is littler, is very beneficial for the miniaturization design of module, and and then is very helpful to improving port density and reducing power consumption.
Description of drawings
Fig. 1 is the synoptic diagram of the automatic temperature-adjusting control circuit of embodiment one of the present utility model;
Fig. 2 is the synoptic diagram of the automatic temperature-adjusting control circuit of embodiment two of the present utility model;
Fig. 3 is the synoptic diagram of the automatic temperature-adjusting control circuit of embodiment three of the present utility model.
Embodiment
Also by reference to the accompanying drawings the utility model is described in further details below by concrete embodiment.
Embodiment one:
As shown in Figure 1, the automatic temperature-adjusting control circuit of optical transceiver module of the present utility model, comprise central control unit 101, switch power converter 102, thermoelectric refrigerating unit 103 and thermistor 104, described central control unit comprises analog/digital converter (ADC) and digital-to-analog converter (DAC); Described thermistor 104 1 end ground connection are moved on the reference voltage and are connected on the pin of analog/digital converter (ADC) of central control unit 101 on the other end, the temperature of laser assembly is fed back to central control unit; The pin of the digital-to-analog converter (DAC) of described central control unit 101 is connected on the feedback voltage pin of switch power converter 102, thereby the output voltage of gauge tap power supply changeover device 102, and then refrigeration and the heat-production functions of control thermoelectric refrigerating unit 103.
The switch power converter of present embodiment is voltage raising and reducing type direct-current switch power supply (DC/DC) converter.Analog/digital converter at the central control unit 101 of embodiment is the analog/digital converter of 12 precision of two passages, and the digital-to-analog converter is the digital-to-analog converter of 12 precision of single channel.
Thermoelectric refrigerating unit 103(TEC) control system comprises 3 parts: temperature collection circuit, TEC current controller and DC/DC converter.The negative pole of TEC directly links to each other with the outside input power supply (as 3.3V) that provides, and the positive pole of TEC is linked the output terminal of DC/DC converter.When the voltage of the output terminal of DC/DC converter is lower than 3.3V, TEC will be in refrigeration mode; When the voltage of the output terminal of DC/DC converter is higher than 3.3V, TEC will be in heating mode.The microprocessor of central control unit 101 is responsible for the detection to the TOSA temperature, and according to the PID(proportional-integral-differential) algorithm is controlled the output of DC/DC converter, thereby realization is to the direction of TEC and the control of electric current.
Be positioned at thermistor 104, the one end ground connection of light emission component (TOSA) lining, an other end then is connected on the outer enclosure pin.This signal needs by moving on the reference voltage (as 2.5V) on the 10Kohm resistance on the external circuit board.At last, this signal need be connected on the ADC pin of microprocessor.When the temperature of TOSA changes, the resistance of thermistor 104 will change according to corresponding rule, thereby this changes the variation that then can realize temperature-resistance resistance-voltage by resistance pressure-dividing network.The microprocessor of central control unit 101 is namely known the temperature of TOSA by detecting this voltage.
The DC/DC converter of present embodiment need be supported step-up/down, and the feedback voltage pin is provided, thereby has the output voltage regulatory function.The DAC pin of microprocessor need be connected on the feedback voltage pin of this DC/DC converter.Microprocessor is determined the output voltage of DAC by temperature detection and pid algorithm, output voltage is changed between+the 4.5V at+2.1V, thereby realize that TEC heats/refrigerating function.
The course of work of present embodiment is as follows:
1. temperature collection circuit detects thermistor 104 resistances, and the preset relation according to resistance and temperature calculates Current Temperatures, and temperature signal is converted into analog voltage signal, and it is fed back to the inner ADC of TEC current controller.
2. use the analog voltage signal sampling of the representation temperature of inner ADC, and restore current temperature value.Current temperature value and the target temperature that will set are compared.Relative size relation according to both determines the TEC direction of current.Both difference input pid algorithms are calculated, needing to obtain the TEC size of current of setting.TEC direction of current as required and size are set suitable DAC and are exported to the DC/DC converter.
3. the DC/DC converter is used for to TEC module output suitable current, and implementation method is: the positive pole of TEC module is connected to fixing 3.3V, when cathode voltage heats during less than 3.3V, and cathode voltage refrigeration during greater than 3.3V, thus change the temperature of TOSA.
4. thermistor 104 feeds back to temperature collection circuit with new temperature information.Through above-mentioned closed loop adjustment after a while, the TOSA temperature is stabilized in design temperature the most at last.
Embodiment two:
As shown in Figure 2, the difference of present embodiment and embodiment one is, also comprise resistance in series 105 and flash current detector 106, described resistance in series 105 1 ends connect thermoelectric refrigerating unit 103, the other end connects the voltage output end of switch power converter 102, described flash current detector 106 connects the two ends of resistance in seriess 105, and is connected on the pin of analog/digital converter, and the current conversion of thermoelectric refrigerating unit 103 is voltage and feeds back to central control unit 101.
Resistance in series 105 is interconnected between switch power converter 102 outputs and the thermoelectric refrigerating unit (TEC) 103, is used for the current/voltage sampling of thermoelectric refrigerating unit (TEC) 103.In the present embodiment, the resistance of described resistance in series 105 is 0.01 ohm.
Hot feedback problem under the high-temperature condition, present embodiment is monitored the electric current of TEC103.Because what adopt is voltage source, rather than current source, microprocessor is not also known the electric current of TEC103, and this scheme also need be used a flash current detector 106.The precision resistance of this detecting device and a little resistance is realized the conversion of current-voltage.The voltage signal that finally converts need be connected on the ADC pin of microprocessor.Microprocessor is namely known the electric current of TEC103 by detecting the voltage of ADC.Exceed restriction in case microprocessor detects the TEC103 electric current, pid algorithm will be stopped, and keep last calculated value.
Embodiment three:
The difference of present embodiment and embodiment two is, also comprises comparer 107.
As shown in Figure 3, the feedback signal of the output terminal of comparer 107 and switch power converter 102 is interconnected, and the input supply voltage of TEC103 and reference voltage insert the input end of comparer 107.Comparer 107 is used for judging whether power input voltage changes, and in time feeds back to switch power converter 102.Because comparer 107 is by hard-wired, its processing speed is very fast, any variation takes place in case it detects input supply voltage, it will be reacted to result of variations on the feedback pin of switch power converter 102 at once, thereby make the output of switch power converter 102 that corresponding variation also take place, and then voltage, the electric current of keeping TEC103 remain unchanged.Thereby avoid because the laser temperature change that external power source draws local derviation to cause.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (8)
1. an automatic temperature-adjusting control circuit is characterized in that, comprises central control unit, switch power converter, thermoelectric refrigerating unit and thermistor, and described central control unit comprises analog/digital converter and digital-to-analog converter; Described thermistor one end ground connection is moved on the reference voltage and is connected on the pin of analog/digital converter of central control unit on the other end, the temperature of laser assembly is fed back to central control unit; The pin of the digital-to-analog converter of described central control unit is connected on the feedback voltage pin of switch power converter, thus the output voltage of gauge tap power supply changeover device, and then refrigeration and the heat-production functions of control thermoelectric refrigerating unit.
2. automatic temperature-adjusting control circuit according to claim 1 is characterized in that, described switch power converter is voltage raising and reducing type direct-current switch power supply converter.
3. automatic temperature-adjusting control circuit according to claim 1, it is characterized in that, the analog/digital converter of described central control unit is the analog/digital converter of 12 precision of two passages, and described digital-to-analog converter is the digital-to-analog converter of 12 precision of single channel.
4. automatic temperature-adjusting control circuit according to claim 1 is characterized in that, described central control unit comes the output of gauge tap power supply changeover device according to the proportional-integral-differential algorithm.
5. automatic temperature-adjusting control circuit according to claim 1, it is characterized in that, also comprise resistance in series and flash current detector, described resistance in series one end connects thermoelectric refrigerating unit, the other end connects the voltage output end of switch power converter, described flash current detector connects the two ends of resistance in series, and is connected on the pin of analog/digital converter, and the current conversion of thermoelectric refrigerating unit is voltage and feeds back to central control unit.
6. automatic temperature-adjusting control circuit according to claim 5 is characterized in that, the resistance of described resistance in series is 0.008 ohm to 0.05 ohm.
7. automatic temperature-adjusting control circuit according to claim 1, it is characterized in that, also comprise comparer, the output terminal of described comparer and the feedback signal of switch power converter are interconnected, and the input end of comparer connects input supply voltage and the reference voltage of thermoelectric refrigerating unit.
8. an optical transceiver module comprises light emission component, optical fiber receive module, circuit substrate, shell and optical fiber interface, it is characterized in that, described circuit substrate comprises automatic temperature-adjusting control circuit as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320142722 CN203133636U (en) | 2013-03-27 | 2013-03-27 | Automatic temperature-control circuit and optical transceiver module including same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320142722 CN203133636U (en) | 2013-03-27 | 2013-03-27 | Automatic temperature-control circuit and optical transceiver module including same |
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| CN203133636U true CN203133636U (en) | 2013-08-14 |
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| CN 201320142722 Expired - Lifetime CN203133636U (en) | 2013-03-27 | 2013-03-27 | Automatic temperature-control circuit and optical transceiver module including same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410594A (en) * | 2016-06-08 | 2017-02-15 | 江苏骏龙光电科技股份有限公司 | Laser power automatic control system |
| CN108539574A (en) * | 2017-03-06 | 2018-09-14 | 苏州旭创科技有限公司 | Low-power-consumptiocontrol control method, control device and the optical module of laser. operating temperature |
| CN111226401A (en) * | 2017-09-30 | 2020-06-02 | 华为技术有限公司 | Optical device, optical module, optical device, and optical line terminal |
| TWI720676B (en) * | 2019-11-05 | 2021-03-01 | 台達電子工業股份有限公司 | Over temperature compensation control circuit |
| CN113359904A (en) * | 2021-06-21 | 2021-09-07 | 武汉光迅科技股份有限公司 | Heating control unit and device |
-
2013
- 2013-03-27 CN CN 201320142722 patent/CN203133636U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410594A (en) * | 2016-06-08 | 2017-02-15 | 江苏骏龙光电科技股份有限公司 | Laser power automatic control system |
| CN108539574A (en) * | 2017-03-06 | 2018-09-14 | 苏州旭创科技有限公司 | Low-power-consumptiocontrol control method, control device and the optical module of laser. operating temperature |
| CN108539574B (en) * | 2017-03-06 | 2021-05-14 | 苏州旭创科技有限公司 | Low-power-consumption control method and control device for laser working temperature and optical module |
| CN111226401A (en) * | 2017-09-30 | 2020-06-02 | 华为技术有限公司 | Optical device, optical module, optical device, and optical line terminal |
| CN111226401B (en) * | 2017-09-30 | 2022-02-18 | 华为技术有限公司 | Optical device, optical module, optical device, and optical line terminal |
| TWI720676B (en) * | 2019-11-05 | 2021-03-01 | 台達電子工業股份有限公司 | Over temperature compensation control circuit |
| CN113359904A (en) * | 2021-06-21 | 2021-09-07 | 武汉光迅科技股份有限公司 | Heating control unit and device |
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Granted publication date: 20130814 |