CN101907897A - Temperature control circuit and protection device thereof - Google Patents
Temperature control circuit and protection device thereof Download PDFInfo
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- CN101907897A CN101907897A CN2009101076948A CN200910107694A CN101907897A CN 101907897 A CN101907897 A CN 101907897A CN 2009101076948 A CN2009101076948 A CN 2009101076948A CN 200910107694 A CN200910107694 A CN 200910107694A CN 101907897 A CN101907897 A CN 101907897A
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Abstract
The invention disclosed a temperature control circuit. The temperature control circuit comprises a device under temperature control and a driving circuit, wherein the driving circuit is used for controlling the temperature of the device under temperature control; and a protection device of the temperature control circuit comprises a temperature protection circuit for detecting the temperature of the device under temperature control, transmitting a cut-off signal to the driving circuit when the temperature of the device under temperature control is higher than a preset temperature value and cutting off the driving circuit. In the protection device of the temperature control circuit, a temperature control module comprises a module under temperature control and a driving module, wherein the driving module is used for controlling the temperature of the module under temperature control; and the protection device module comprises a temperature protection module for detecting the temperature of the module under temperature control, transmitting the cut-off signal to the driving module when the temperature of the module under temperature control is higher than the preset temperature value and cutting off the driving module.
Description
Technical field
The invention belongs to the Electronics Science and Technology field, specifically, relate to a kind of temperature control circuit and protective device thereof.
Background technology
Temperature-control circuit is widely used in fields such as electronics, communication, medical treatment, aviation.
Can realize temperature controlled device have thermoelectric refrigerating unit (Thermoelectronic Cooler, TEC), resistance temperature detector (RTD), thermopair etc.Wherein thermoelectric refrigerating unit (TEC) is because of volume is little, and both can freeze also can heat, and refrigeration (heat) speed is fast, and multistage polyphone uses can obtain more low temperature, low price and characteristics such as easy to use, be used in widely various types of temperature control circuits in.
The driving circuit of TEC is generally all set several parts such as DAC (digital to analog converter), Temperature sampler, PID (proportion integration differentiation) controller, PWM (width modulation) analog line driver, filtering circuit and is formed by temperature.Its principle is by the PID controller temperature setting signal to be compared with the temperature signal of collection, its differential signal produces the TEC control signal through the PID computing, control pwm power driver, the signal that is come out by the pwm power driver drives TEC after filtering.
By CPU and temperature setting DAC temperature value being converted to corresponding setting voltage by the setting of the temperature of temperature control device sets, this is provided with voltage can be because former thereby wrong settings such as the instability of the run-time error of software, hardware circuit, DAC mistake be damaged thereby make by temperature control device or driving circuit.Driving circuit output Control current can be controlled by the temperature of temperature control device height by the size of controlling this electric current, because reasons such as circuit instability are excessive, TEC device and driving circuit all is damaged when Control current.TEC device cost is higher, can cause the rising significantly of whole cost in case suffer damage, and lacks in the prior art to driving circuit with by effective protection of temperature control device.
Summary of the invention
The invention provides a kind of temperature control circuit and protective device thereof, can protect by temperature control device and driving circuit.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of temperature control circuit comprises by temperature control device and driving circuit, and described driving circuit is used to control described by the temperature of temperature control device.The protective device of described temperature control circuit comprises temperature protection circuit, is used for detecting by the temperature control device temperature, and sends cut-off signals to driving circuit when being higher than predetermined temperature value by the temperature control device temperature, turn-offs driving circuit.
In a kind of embodiment of above-mentioned temperature control circuit; described temperature protection circuit comprises thermometric device and processor; described thermometric device describedly is converted into the temperature digital amount by temperature control device temperature analog quantity with detected; be sent to described processor; described processor is used at the described cut-off signals that sends when being higher than predetermined temperature value by the temperature control device temperature turn-offing described driving circuit to described driving circuit.
In a kind of embodiment of above-mentioned temperature control circuit, also comprise voltage protection circuit in the described protective device, when voltage is set is higher than predetermined voltage of described driving circuit, protective device sends cut-off signals to described driving circuit, turn-offs described driving circuit.
In a kind of embodiment of above-mentioned temperature control circuit; described voltage protection circuit comprises comparer; the described voltage that is provided with links to each other with two input ends of described comparer respectively with described predetermined voltage, when described when voltage being set being higher than described predetermined voltage, and comparer output cut-off signals.
In a kind of embodiment of above-mentioned temperature control circuit, also comprise current protecting circuit in the described protective device, when described Control current by the temperature control device was higher than scheduled current, protective device sent cut-off signals to described driving circuit, turn-offs described driving circuit.
In a kind of embodiment of above-mentioned temperature control circuit; described current protecting circuit comprises comparer, amplifier and current sampling resistor; Control current is amplified through amplifier through the dropout voltage that obtains behind the current sampling resistor; be connected to an input end of comparer; threshold voltage is connected to another input end of comparer; when dropout voltage is higher than threshold voltage, described comparer output cut-off signals.
In a kind of embodiment of above-mentioned temperature control circuit, it is characterized in that the transformational relation of described threshold voltage and predetermined current value is: threshold voltage=scheduled current * amplifier multiplying power * current sampling resistor value.
The invention also discloses a kind of protective device of temperature control circuit; wherein temperature control module comprises by temperature control module and driver module; described driver module is used to control described by the temperature of temperature control module; described protective device module comprises the temperature protection module; be used for detecting by temperature control module temperature; and at the described cut-off signals that sends when being higher than predetermined temperature value by temperature control module temperature to described driver module, turn-off described driver module.
The protective device of a kind of temperature control circuit disclosed by the invention, described protective device module also comprises the voltage protection module, and when voltage is set is higher than predetermined voltage of driver module, the protective device module sends cut-off signals to institute's driver module, turn-offs driver module.
The protective device of a kind of temperature control circuit disclosed by the invention, described protective device module also comprises the current protection module, and when being higher than scheduled current by the Control current of temperature control module, protective device sends cut-off signals to driver module, turn-offs driver module.
Compared with prior art, beneficial effect of the present invention is:
By protective device is set in temperature control circuit; protective device detect in the temperature control circuit by the temperature of temperature control device; and when being higher than predetermined temperature value by the temperature of temperature control device; produce cut-off signals; driving circuit is turn-offed; and then turn-off by the temperature control device, what prevent effectively that the circuit environment is unstable or be provided with that defective mode such as mistake causes is caused by the damage of temperature control device and driving circuit by the temperature control device temperature is too high.
Description of drawings
The description that Fig. 1 is exemplary a kind of formation of temperature control circuit;
The description that Fig. 2 is exemplary temperature protection circuit in a kind of temperature control circuit;
The description that Fig. 3 is exemplary voltage protection circuit in a kind of temperature control circuit;
The description that Fig. 4 is exemplary current protecting circuit in a kind of temperature control circuit.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated:
As shown in Figure 1; in the temperature control circuit of one embodiment of the present of invention, comprise, can be finished various correlation functions by the change of temperature by the temperature control device by temperature control device and driving circuit; driving circuit is used to control the temperature by the temperature control device, and this temperature control circuit has protective device.
As shown in Figure 2, comprise temperature protection circuit in the protective device of the temperature control circuit of one embodiment of the present of invention.Temperature protection circuit comprises thermometric device and processor.The thermometric device detects by the temperature of temperature control device, and is converted into the temperature digital amount with detected by temperature control device temperature analog quantity, is sent to processor.Processor is to being compared by the temperature digital amount and the predetermined temperature value of temperature control device; when being higher than predetermined temperature value, send cut-off signals to driving circuit by the temperature control device temperature; turn-off driving circuit; thereby prevented too high effectively and damage that take place has been protected by the temperature control device by temperature control device Yin Wendu.
As shown in Figure 3, also comprise voltage protection circuit in the protective device of the temperature control circuit of one embodiment of the present of invention.Voltage protection circuit comprises a comparer.In voltage protection circuit, voltage is set links to each other with two input ends of comparer respectively, when voltage being set being higher than predetermined voltage with predetermined voltage; comparer output cut-off signals is to driving circuit; turn-off driving circuit, thereby protected driving circuit effectively, also protected by the temperature control device.
In the voltage protection circuit, predetermined voltage carries out dividing potential drop by two resistance R 1, R2 to a reference voltage and obtains.
As shown in Figure 3, also comprise current protecting circuit in the protective device of the temperature control circuit of one embodiment of the present of invention.Described current protecting circuit comprises comparer, amplifier and current sampling resistor R5.The dropout voltage that obtains behind the Control current process current sampling resistor R5 is amplified through amplifier; link to each other with an input end of comparer; threshold voltage links to each other with another input end of comparer; when dropout voltage is higher than threshold voltage; comparer output cut-off signals is to driving circuit; turn-off driving circuit, thereby protected by the temperature control device.Simultaneously, owing to driving circuit is had retroactive effect, so also protected driving circuit the restriction Control current time simultaneously by the temperature control device.
In current protecting circuit, threshold voltage carries out dividing potential drop by two resistance R 3, R4 to a reference voltage and obtains.
In current protecting circuit, the transformational relation of threshold voltage and scheduled current is: threshold voltage=scheduled current * amplifier multiplying power * current sampling resistor value.
The protective device of a kind of temperature control circuit of example of the present invention comprises temperature protection circuit, is used for detecting by the temperature control device temperature, and sends cut-off signals to driving circuit when being higher than predetermined temperature value by the temperature control device temperature, turn-offs driving circuit.Also comprise voltage protection circuit in the protective device of described temperature control circuit, when voltage is set is higher than predetermined voltage of driving circuit, protective device sends cut-off signals to institute's driving circuit, turn-offs driving circuit.Also comprise current protecting circuit in the protective device of described temperature control circuit, when being higher than scheduled current by the Control current of temperature control device, protective device sends cut-off signals to driving circuit, turn-offs driving circuit.
Temperature control circuit of the present invention and protective device thereof comprise by temperature control device, driving circuit and protective device; wherein protective device can to by the temperature control device temperature, voltage is set, Control current detects; when these values exceed corresponding predetermined value; protective device sends cut-off signals to driving circuit; turn-off driving circuit, thereby protected effectively by temperature control device and driving circuit.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, but this example of just lifting for ease of understanding should not think that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can make various possible being equal to and change or replacement, these changes or replacement all should belong to protection scope of the present invention.
Claims (10)
1. temperature control circuit; comprise by temperature control device and driving circuit; described driving circuit is used to control described by the temperature of temperature control device; it is characterized in that; the protective device of described temperature control circuit comprises temperature protection circuit; be used for detecting by the temperature control device temperature, and send cut-off signals to described driving circuit when being higher than predetermined temperature value, turn-off described driving circuit by the temperature control device temperature described.
2. temperature control circuit as claimed in claim 1; it is characterized in that; comprise thermometric device and processor in the described temperature protection circuit; described thermometric device describedly is converted into the temperature digital amount by temperature control device temperature analog quantity with detected; be sent to described processor; described processor is used at the described cut-off signals that sends when being higher than predetermined temperature value by the temperature control device temperature turn-offing described driving circuit to described driving circuit.
3. temperature control circuit as claimed in claim 1; it is characterized in that, also comprise voltage protection circuit in the described protective device, when voltage is set is higher than predetermined voltage of described driving circuit; protective device sends cut-off signals to described driving circuit, turn-offs described driving circuit.
4. temperature control circuit as claimed in claim 3; it is characterized in that described voltage protection circuit comprises comparer, the described voltage that is provided with links to each other with two input ends of described comparer respectively with described predetermined voltage; when described when voltage being set being higher than described predetermined voltage, comparer output cut-off signals.
5. temperature control circuit as claimed in claim 1; it is characterized in that, also comprise current protecting circuit in the described protective device, when described Control current by the temperature control device is higher than scheduled current; protective device sends cut-off signals to described driving circuit, turn-offs described driving circuit.
6. temperature control circuit as claimed in claim 5; it is characterized in that; described current protecting circuit comprises comparer, amplifier and current sampling resistor; Control current is amplified through amplifier through the dropout voltage that obtains behind the current sampling resistor; be connected to an input end of comparer; threshold voltage is connected to another input end of comparer, when dropout voltage is higher than threshold voltage, and described comparer output cut-off signals.
7. temperature control circuit as claimed in claim 6 is characterized in that, the transformational relation of described threshold voltage, predetermined current value is: threshold voltage=scheduled current * amplifier multiplying power * current sampling resistor value.
8. the protective device of a temperature control circuit; wherein temperature control module comprises by temperature control module and driver module; described driver module is used to control described by the temperature of temperature control module; it is characterized in that; described protective device module comprises the temperature protection module; be used for detecting by temperature control module temperature, and send cut-off signals to described driver module when being higher than predetermined temperature value, turn-off described driver module by temperature control module temperature described.
9. the protective device of a temperature control circuit; it is characterized in that, also comprise the voltage protection module in the described protective device module, when voltage is set is higher than predetermined voltage of described driver module; the protective device module sends cut-off signals to described driver module, turn-offs described driver module.
10. the protective device of a temperature control circuit; it is characterized in that, also comprise the current protection module in the described protective device module, when described Control current by the temperature control module is higher than scheduled current; the protective device module sends cut-off signals to described driver module, turn-offs described driver module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101076948A CN101907897A (en) | 2009-06-05 | 2009-06-05 | Temperature control circuit and protection device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101076948A CN101907897A (en) | 2009-06-05 | 2009-06-05 | Temperature control circuit and protection device thereof |
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| Publication Number | Publication Date |
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| CN101907897A true CN101907897A (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101076948A Pending CN101907897A (en) | 2009-06-05 | 2009-06-05 | Temperature control circuit and protection device thereof |
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| CN (1) | CN101907897A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354951A (en) * | 2011-09-28 | 2012-02-15 | 上海显恒光电科技股份有限公司 | Temperature protection circuit and method |
| CN103001562A (en) * | 2011-09-19 | 2013-03-27 | 重庆中科芯亿达电子有限公司 | Temperature-protection built-in integrated direct-current motor driving circuit for toy |
| CN103036493A (en) * | 2011-10-09 | 2013-04-10 | 重庆中科芯亿达电子有限公司 | Toy lock direct current motor driving integrated circuit with temperature protection |
| CN105928516A (en) * | 2016-04-12 | 2016-09-07 | 北京臻迪机器人有限公司 | Inertial measurement unit and heating device thereof, and inertial measurement system |
| CN109445490A (en) * | 2018-12-12 | 2019-03-08 | 上海航天控制技术研究所 | A kind of temperature control circuit of highly reliable high safety |
| CN111934281A (en) * | 2020-08-10 | 2020-11-13 | 迈普通信技术股份有限公司 | Electronic equipment overtemperature protection circuit, electronic equipment and overtemperature protection control method |
-
2009
- 2009-06-05 CN CN2009101076948A patent/CN101907897A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001562A (en) * | 2011-09-19 | 2013-03-27 | 重庆中科芯亿达电子有限公司 | Temperature-protection built-in integrated direct-current motor driving circuit for toy |
| CN102354951A (en) * | 2011-09-28 | 2012-02-15 | 上海显恒光电科技股份有限公司 | Temperature protection circuit and method |
| CN102354951B (en) * | 2011-09-28 | 2015-01-07 | 上海显恒光电科技股份有限公司 | Temperature protection circuit and method |
| CN103036493A (en) * | 2011-10-09 | 2013-04-10 | 重庆中科芯亿达电子有限公司 | Toy lock direct current motor driving integrated circuit with temperature protection |
| CN103036493B (en) * | 2011-10-09 | 2017-02-15 | 重庆中科芯亿达电子有限公司 | Toy lock direct current motor driving integrated circuit with temperature protection |
| CN105928516A (en) * | 2016-04-12 | 2016-09-07 | 北京臻迪机器人有限公司 | Inertial measurement unit and heating device thereof, and inertial measurement system |
| CN105928516B (en) * | 2016-04-12 | 2018-09-28 | 北京臻迪机器人有限公司 | A kind of Inertial Measurement Unit and its heating device, inertial measurement system |
| CN109445490A (en) * | 2018-12-12 | 2019-03-08 | 上海航天控制技术研究所 | A kind of temperature control circuit of highly reliable high safety |
| CN111934281A (en) * | 2020-08-10 | 2020-11-13 | 迈普通信技术股份有限公司 | Electronic equipment overtemperature protection circuit, electronic equipment and overtemperature protection control method |
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Application publication date: 20101208 |