CN105553453B - A kind of automatically controlled temperature switch circuit - Google Patents
A kind of automatically controlled temperature switch circuit Download PDFInfo
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- CN105553453B CN105553453B CN201610046290.2A CN201610046290A CN105553453B CN 105553453 B CN105553453 B CN 105553453B CN 201610046290 A CN201610046290 A CN 201610046290A CN 105553453 B CN105553453 B CN 105553453B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
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- Electronic Switches (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The automatically controlled temperature switch circuit of the present invention, including temperature sensor, filter circuit and comparison circuit are hysteresis loop comparator.Filtered voltage signal is connected to the positive voltage input end of pin 1 of hysteresis loop comparator, and the reverse voltage input of pin 2 of hysteresis loop comparator is connected with input reference voltage V with the reference voltage output terminal of pin 7REF, the negative pole threshold voltage input of pin 5 is connected with the reverse voltage input of pin 2, and the reference voltage output terminal of pin 7 passes sequentially through resistance R2 and resistance R3 ground connection, the positive pole threshold voltage V of pin 6IHInput is connected to resistance R2 and resistance R3 junction, and the supply voltage VCC inputs of pin 8 are connected to the signal output part of pin 4 by pull-up resistor R4.Temperature sensor signal can be converted into voltage signal output so that the circuit completes the switch control to subordinate's circuit in certain temperature by the on-off circuit with the change of device temperature.
Description
Technical field
The present invention relates to a kind of on-off circuit, especially a kind of automatically controlled temperature switch circuit, needed suitable for automotive field
Pass through the break-make of temperature limit automatic control circuit.
Background technology
In the environment of low temperature or high temperature, some devices on vehicle easily cause damage because of temperature problem, it is therefore desirable to enter
Trip temperature is controlled to complete the protection to these devices.And temperature control mode mainly passes through special metal in not equality of temperature at present
The characteristic that degree issues raw physical deformation realizes circuit control, this mode exist control temperature error is big, temperature switch device can
By property and uniformity it is unstable the defects of.
The content of the invention
The present invention is in order to overcome the shortcomings of above technology, there is provided a kind of automatically controlled temperature switch circuit, it is real to pass through the circuit
Now accurate temperature switch control, and with the advantage of stable reliability and uniformity.
Technical scheme is used by the present invention overcomes its technical problem：
A kind of automatically controlled temperature switch circuit, including temperature sensor, filter circuit and comparison circuit, temperature sensor pass through
The input of comparison circuit is connected to after filter circuit filtering；
The temperature sensor is thermistor RS；
The filter circuit includes EMC filter circuit and passive RC low-pass filter circuits, and wherein EMC filter circuit includes electricity
Hold C2, passive RC low-pass filter circuits include resistance R5 and electric capacity C3；
The comparison circuit includes hysteresis loop comparator, and it includes 8 pins, and pin 1 is the positive phase voltage of hysteresis loop comparator
Input, pin 2 are the reverse voltage input of hysteresis loop comparator, and pin 3 is power supply, and pin 4 is signal output part, pin
5 be negative pole threshold voltage input, and pin 6 is positive pole threshold voltage VIHInput, pin 7 are reference voltage output terminal, pin 8
For supply voltage VCC inputs；
Thermistor RS is in series with pull-up resistor R1 and partial pressure is carried out to supply voltage VCC, and electric capacity C2 and thermistor RS is simultaneously
Voltage signal after thermistor RS partial pressures is carried out EMC filtering by connection, and resistance R5 and electric capacity C3 are in parallel with electric capacity C2 to EMC filtering
Voltage signal afterwards enters line noise filter again, and the filtered voltage signal is connected to the positive of pin 1 electricity of hysteresis loop comparator
Input is pressed, the reverse voltage input of pin 2 of hysteresis loop comparator is connected to input reference with the reference voltage output terminal of pin 7
Voltage VREF, the negative pole threshold voltage input of pin 5 is connected with the reverse voltage input of pin 2, the reference voltage output of pin 7
End passes sequentially through resistance R2 and resistance R3 ground connection, the positive pole threshold voltage V of pin 6IHInput is connected to resistance R2's and resistance R3
Junction, the supply voltage VCC inputs of pin 8 are connected to the signal output part of pin 4 by pull-up resistor R4.
According to currently preferred, the supply voltage VCC of pin 8 of the filtered voltage signal and hysteresis loop comparator is defeated
Enter and be connected with clamp diode D1 and D2 between end and the power supply ground of pin 3 to prevent overvoltage from inputting, play the work of protection circuit
With.
According to currently preferred, the supply voltage VCC inputs of pin 8 and the power supply of pin 3 of the hysteresis loop comparator
Between be also associated with the electric capacity C1 in parallel with clamp diode D1 and D2 to be filtered decoupling to supply voltage.
According to currently preferred, the signal output part of pin 4 of the hysteresis loop comparator is connected with diode D3 to prevent
Inverse overvoltage inputs, and plays a part of protecting chip.
The beneficial effects of the invention are as follows：
1st, temperature sensor signal can be converted into voltage letter by on-off circuit of the invention with the change of device temperature
Number output so that the circuit is completed to control the switch of subordinate's circuit in certain temperature.
2nd, circuit level of the invention is high, design is succinct, temperature switch control accuracy is high, low in energy consumption, and with stable
Reliability and uniformity.
Brief description of the drawings
Fig. 1 is the theory structure schematic diagram of the present invention.
Fig. 2 is the schematic diagram of the hysteresis loop comparator of the present invention.
Fig. 3 is the circuit theory diagrams of the present invention.
Embodiment
The present invention is better understood from for the ease of those skilled in the art, the present invention is done with specific embodiment below in conjunction with the accompanying drawings
It is further described, following is only exemplary not limit protection scope of the present invention.
As shown in figure 1, the automatically controlled temperature switch circuit of the present invention, including temperature sensor, filter circuit and comparison circuit,
Temperature sensor is connected to the input of comparison circuit after circuit filtering after filtering.
The temperature sensor is thermistor RS, and thermistor RS uses negative temperature coefficient heat-sensitive resistance material, and it is special
Point is raised with temperature, and resistance value reduces.The filter circuit includes EMC filter circuit and passive RC low-pass filter circuits, its
Middle EMC filter circuit includes electric capacity C2, and passive RC low-pass filter circuits include resistance R5 and electric capacity C3.The comparison circuit includes
Hysteresis loop comparator, hysteresis loop comparator use the LMP7300 chips of TI companies, are characterized in exporting high-precision reference voltage, and
Can be its wide input voltage range, low in energy consumption as the reference voltage that compare of input.LMP7300 chips include 8 pins, pin 1
For the positive voltage input end of hysteresis loop comparator, pin 2 is the reverse voltage input of hysteresis loop comparator, and pin 3 is power supply,
Pin 4 is signal output part, and pin 5 is negative pole threshold voltage input, and pin 6 is positive pole threshold voltage VIHInput, pin 7
For reference voltage output terminal, pin 8 is supply voltage VCC inputs.
As shown in figure 3, thermistor RS connects with pull-up resistor R1 carries out partial pressure to supply voltage VCC, electric capacity C2 and heat
Voltage signal after thermistor RS partial pressures is carried out EMC filtering by quick resistance RS parallel connections, and resistance R5 and electric capacity C3 form passive RC
Low-pass filter circuit is in parallel with electric capacity C2 to enter line noise filter again to the filtered voltage signals of EMC, then filtered voltage
Signal between the supply voltage VCC inputs of pin 8 and the power supply ground of pin 3 of hysteresis loop comparator by being connected with clamp diode
D1 and D2 is to prevent overvoltage input so that protection circuit, goes back between the supply voltage VCC inputs of pin 8 and the power supply ground of pin 3
The electric capacity C1 in parallel with clamp diode D1 and D2 is connected with to be filtered decoupling to supply voltage.The filtered voltage
Signal is connected to the positive voltage input end of pin 1 of hysteresis loop comparator, and the reverse voltage input of pin 2 of hysteresis loop comparator is with drawing
The reference voltage output terminal of pin 7 is connected with input reference voltage VREF, as shown in Fig. 2 hysteresis loop comparator negative pole threshold voltage is
Zero, so the negative pole threshold voltage input of pin 5 is connected with the reverse voltage input of pin 2, the reference voltage output of pin 7
End passes sequentially through resistance R2 and resistance R3 ground connection, the positive pole threshold voltage V of pin 6IHInput is connected to resistance R2's and resistance R3
Junction, the reference voltage V that resistance R2 and R3 exports pin 7REFPartial pressure is carried out, the voltage at R2 both ends is hysteresis loop comparator
Positive pole threshold voltage, the supply voltage VCC inputs of pin 8 are connected to the signal output part of pin 4, pin by pull-up resistor R4
4 signal output parts are connected with diode D3 to prevent inverse overvoltage input from protecting chip.
When the applied signal voltage of pin 1 of hysteresis loop comparator is higher than 6 positive pole threshold voltage of pin, the signal output of pin 4
End output high level；When the applied signal voltage of pin 1 is less than 6 positive pole threshold voltage of pin, the output of the signal output part of pin 4 is low
Level, controlled with this come the switch completed to subordinate's circuit.
Above only describes the general principle and preferred embodiment of the present invention, those skilled in the art can be according to foregoing description
Many changes may be made and improves, and these changes and improvements should belong to protection scope of the present invention.
Claims (4)
- A kind of 1. automatically controlled temperature switch circuit, it is characterised in that：Including temperature sensor, filter circuit and comparison circuit, temperature Sensor is connected to the input of comparison circuit after circuit filtering after filtering；The temperature sensor is thermistor RS；The filter circuit includes EMC filter circuit and passive RC low-pass filter circuits, and wherein EMC filter circuit includes electric capacity C2, passive RC low-pass filter circuits include resistance R5 and electric capacity C3；The comparison circuit includes hysteresis loop comparator, and it includes 8 pins, and pin 1 is the positive control source of hysteresis loop comparator End, pin 2 are the reverse voltage input of hysteresis loop comparator, and, pin 4 is signal output part to pin 3, and pin 5 is for power supply Negative pole threshold voltage input, pin 6 are positive pole threshold voltage VIHInput, pin 7 are reference voltage output terminal, and pin 8 is Supply voltage VCC inputs；Thermistor RS is in series with pull-up resistor R1 and partial pressure is carried out to supply voltage VCC, and electric capacity C2 is in parallel with thermistor RS will Voltage signal after thermistor RS partial pressures carries out EMC filtering, and resistance R5 and electric capacity C3 are in parallel with electric capacity C2 filtered to EMC Voltage signal enters line noise filter again, and the voltage signal after the noise filtering is connected to the positive of pin 1 electricity of hysteresis loop comparator Input is pressed, the reverse voltage input of pin 2 of hysteresis loop comparator is connected to input reference with the reference voltage output terminal of pin 7 Voltage VREF, the negative pole threshold voltage input of pin 5 is connected with the reverse voltage input of pin 2, the reference voltage output of pin 7 End passes sequentially through resistance R2 and resistance R3 ground connection, the positive pole threshold voltage V of pin 6IHInput is connected to resistance R2's and resistance R3 Junction, the supply voltage VCC inputs of pin 8 are connected to the signal output part of pin 4 by pull-up resistor R4.
- 2. on-off circuit according to claim 1, it is characterised in that：Voltage signal and hysteresis ratio after the noise filtering Clamp diode D1 and D2 is connected with to prevent electricity compared between the supply voltage VCC inputs of pin 8 and the power supply ground of pin 3 of device Pressure input.
- 3. on-off circuit according to claim 2, it is characterised in that：The supply voltage VCC of pin 8 of the hysteresis loop comparator The electric capacity C1 in parallel with clamp diode D1 and D2 is also associated with to be carried out to supply voltage between input and the power supply ground of pin 3 Filtering decoupling.
- 4. according to the on-off circuit described in claim 1 or 2 or 3, it is characterised in that：The signal of pin 4 of the hysteresis loop comparator Output end is connected with diode D3 to prevent inverse overvoltage from inputting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610046290.2A CN105553453B (en) | 2016-01-25 | 2016-01-25 | A kind of automatically controlled temperature switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610046290.2A CN105553453B (en) | 2016-01-25 | 2016-01-25 | A kind of automatically controlled temperature switch circuit |
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| Publication Number | Publication Date |
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| CN105553453A CN105553453A (en) | 2016-05-04 |
| CN105553453B true CN105553453B (en) | 2018-04-10 |
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| CN201610046290.2A Active CN105553453B (en) | 2016-01-25 | 2016-01-25 | A kind of automatically controlled temperature switch circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108045299B (en) * | 2017-12-25 | 2024-03-26 | 中国重汽集团济南动力有限公司 | Automatic automobile light control device with protection function |
| CN110045651A (en) * | 2019-04-23 | 2019-07-23 | 苏州爱科赛博电源技术有限责任公司 | A kind of electric vehicle controller digital input circuit of the compatible positive and negative control of adjustable threshold |
| CN110487437B (en) * | 2019-07-10 | 2021-08-24 | 深圳市虹鹏能源科技有限责任公司 | Integrated temperature monitoring system |
| CN111174965A (en) * | 2020-01-06 | 2020-05-19 | 江苏海诺普谩电子科技有限公司 | Atmospheric pressure altitude switch temperature compensation system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355246A (en) * | 2011-05-18 | 2012-02-15 | 中国兵器工业集团第二一四研究所苏州研发中心 | High speed DAC current source switch driving circuit |
| CN205490462U (en) * | 2016-01-25 | 2016-08-17 | 中国重汽集团济南动力有限公司 | Automatically controlled temperature detect switch circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI348270B (en) * | 2008-05-21 | 2011-09-01 | Niko Semiconductor Co Ltd | A negative voltage switching apparatus |
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- 2016-01-25 CN CN201610046290.2A patent/CN105553453B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355246A (en) * | 2011-05-18 | 2012-02-15 | 中国兵器工业集团第二一四研究所苏州研发中心 | High speed DAC current source switch driving circuit |
| CN205490462U (en) * | 2016-01-25 | 2016-08-17 | 中国重汽集团济南动力有限公司 | Automatically controlled temperature detect switch circuit |
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| CN105553453A (en) | 2016-05-04 |
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