CN209433264U - A kind of lambda sensor automatic temperature control circuit - Google Patents
A kind of lambda sensor automatic temperature control circuit Download PDFInfo
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- CN209433264U CN209433264U CN201920370929.1U CN201920370929U CN209433264U CN 209433264 U CN209433264 U CN 209433264U CN 201920370929 U CN201920370929 U CN 201920370929U CN 209433264 U CN209433264 U CN 209433264U
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Abstract
The utility model relates to temperature-adjusting circuit field, espespecially a kind of lambda sensor automatic temperature control circuit.The variable resistance RT voltage of the utility model lambda sensor automatic temperature control circuit with environment temperature variation rely on be hardware feedback, it is automatically adjusted in the course of work, until equilibrium temperature, it realizes that the operating temperature of lambda sensor does not change with the variation of environment temperature, achievees the purpose that temperature automatically controlled.
Description
Technical field
The utility model relates to temperature-adjusting circuit field, espespecially a kind of lambda sensor automatic temperature control circuit.
Background technique
Microwave oven in the market is provided with Temperature Humidity Sensor, for detecting the temperature and humidity in oven.Work as heating
Voltage remains unchanged and when the temperature of sensor hearing resistor local environment changes, heating resistor resistance value can find to become
Change, so that heating temperature can also change, cannot achieve temperature automatically controlled.
Summary of the invention
To solve the above problems, the utility model provides a kind of lambda sensor automatic temperature control circuit, so that the work of sensor
Make temperature not change with the variation of environment temperature.
A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: lambda sensor automatic temperature control circuit, packet
Include resistance R0, resistance R1, resistance R2, resistance R3, variable resistance RT, operational amplifier U1 and metal-oxide-semiconductor Q1, the resistance R0 and can
One end that power transformation hinders RT is electrically connected with the non-inverting input terminal of operational amplifier U1 simultaneously, one end of the resistance R1 and resistance R2
It being electrically connected simultaneously with the inverting input terminal of operational amplifier U1, the other end of the resistance R0 and resistance R1 are grounded GND simultaneously,
The other end of the variable resistance RT and resistance R2 is electrically connected with the source electrode of metal-oxide-semiconductor Q1 simultaneously, the operational amplifier U1's
Output and the grid of metal-oxide-semiconductor Q1 are electrically connected, and the both ends of the resistance R3 electrically connect with the source electrode and drain electrode of metal-oxide-semiconductor Q1 respectively
It connects, the drain electrode external power supply VCC of the metal-oxide-semiconductor Q1.
Further, the metal-oxide-semiconductor Q1 is the enhanced metal-oxide-semiconductor of N-channel.
Further, the variable resistance RT is the heating resistor of Electrode in Limiting Current Oxygen Sensor.
Further, the resistance R0, resistance R1, resistance R2 and variable resistance RT meet relational expression R2/R1=RT/R0,
The value of middle RT is corresponding resistance value when needing temperature control.
The utility model has the beneficial effects that: the variable resistance RT electricity of the utility model lambda sensor automatic temperature control circuit
Pressure with the variation of environment temperature rely on be hardware feedback, automatically adjust in the course of work, until equilibrium temperature, realize oxygen
The operating temperature of sensor does not change with the variation of environment temperature, achievees the purpose that temperature automatically controlled.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The technical issues of in order to keep the utility model solved, technical solution and beneficial effect are more clearly understood, below
In conjunction with accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific implementation described herein
Example is only used to explain the utility model, is not used to limit the utility model.
Refering to Figure 1, the utility model is about a kind of lambda sensor automatic temperature control circuit, including resistance R0, resistance
R1, resistance R2, resistance R3, variable resistance RT, operational amplifier U1 and metal-oxide-semiconductor Q1, the one of the resistance R0 and variable resistance RT
End is electrically connected with the non-inverting input terminal of operational amplifier U1 simultaneously, and one end of the resistance R1 and resistance R2 are put with operation simultaneously
The inverting input terminal of big device U1 is electrically connected, and the other end of the resistance R0 and resistance R1 are grounded GND, the variable resistance simultaneously
The other end of RT and resistance R2 are electrically connected with the source electrode of metal-oxide-semiconductor Q1 simultaneously, the output of the operational amplifier U1 and metal-oxide-semiconductor Q1
Grid be electrically connected, the both ends of the resistance R3 respectively with the source electrode and drain electrode of metal-oxide-semiconductor Q1 be electrically connected, the metal-oxide-semiconductor Q1
Drain electrode external power supply VCC.
Further, the metal-oxide-semiconductor Q1 is the enhanced metal-oxide-semiconductor of N-channel；Wherein, the variable resistance RT is limit electricity
The heating resistor of lambda sensor is flowed, and forms bridge circuit with resistance R0, resistance R1, resistance R2；Resistance R0, resistance R1,
The relational expression of resistance R2 and variable resistance RT need to meet R2/R1=RT/R0, and the value of RT is corresponding when needing temperature control herein
Resistance value.
In the present embodiment, the working principle of circuit is as follows: the resistance value of resistance RT becomes larger as temperature increases, according to this
One characteristic, system just power on, and when powering on VCC, the resistance value of resistance RT is lower, and voltage V1 > voltage V2, operational amplifier U1 are defeated
High level out, so that metal-oxide-semiconductor Q1 is connected, resistance R3 short circuit, the voltage applied on resistance RT at this time is close to power supply power supply VCC；With
The passage of time, the resistance value of resistance RT slowly become larger, when be more than need temperature control when resistance value when, voltage V1 < voltage V2, operation
Amplifier U1 exports low level, so that metal-oxide-semiconductor Q1 is disconnected, resistance R3 accesses circuit partial pressure, and the voltage on resistance RT can reduce；By
It is lower in heating voltage, so as to cause temperature decline, the resistance value of resistance RT can be reduced, over time, voltage V1 > voltage
Then metal-oxide-semiconductor Q1 can be connected again in V2, repeatedly, the heating temperature that system can be kept constant.
In use, when environment temperature increases, if heating voltage is constant, actual work temperature is got higher, resistance RT
Resistance value becomes larger, and voltage V1 < voltage V2, operational amplifier U1 export low level, and metal-oxide-semiconductor Q1 is disconnected, and heating voltage becomes on resistance RT
It is small, until reaching setting value.Conversely, when the environment temperature decreases, if heating voltage is constant, actual work temperature is lower, resistance
The resistance value of RT becomes smaller, and voltage V1 > voltage V2, operational amplifier U1 export high level, and metal-oxide-semiconductor Q1 is connected, and electricity is heated on resistance RT
Buckling is small, until reaching setting value.In the present embodiment voltage with environment temperature variation rely on be hardware feedback, speed
It is very fast, it up to microsecond rank, is constantly regulate in the course of work, is millisecond rank until the time of equilibrium temperature, to realize
The operating temperature of sensor does not change with the variation of environment temperature.
Embodiment of above is only that preferred embodiments of the present invention are described, not to the utility model
Range be defined, under the premise of not departing from the spirit of the design of the utility model, this field ordinary engineering and technical personnel to this
The various changes and improvements that the technical solution of utility model is made should all fall into the guarantor that claims of the utility model determine
It protects in range.
Claims (4)
1. a kind of lambda sensor automatic temperature control circuit, it is characterised in that: including resistance R0, resistance R1, resistance R2, resistance R3, can
Power transformation hinder RT, operational amplifier U1 and metal-oxide-semiconductor Q1, the resistance R0 and variable resistance RT one end simultaneously with operational amplifier U1
Non-inverting input terminal be electrically connected, one end of the resistance R1 and resistance R2 simultaneously with the inverting input terminal of operational amplifier U1 electricity
Property connection, the other end that the other end of the resistance R0 and resistance R1 are grounded GND, the variable resistance RT and resistance R2 simultaneously is same
When be electrically connected with the source electrode of metal-oxide-semiconductor Q1, the output of the operational amplifier U1 and the grid of metal-oxide-semiconductor Q1 are electrically connected, described
The both ends of resistance R3 are electrically connected with the source electrode and drain electrode of metal-oxide-semiconductor Q1 respectively, the drain electrode external power supply VCC of the metal-oxide-semiconductor Q1.
2. a kind of lambda sensor automatic temperature control circuit according to claim 1, it is characterised in that: the metal-oxide-semiconductor Q1 is N ditch
The enhanced metal-oxide-semiconductor in road.
3. a kind of lambda sensor automatic temperature control circuit according to claim 1, it is characterised in that: the variable resistance RT is
The heating resistor of Electrode in Limiting Current Oxygen Sensor.
4. a kind of lambda sensor automatic temperature control circuit according to claim 1, it is characterised in that: the resistance R0, resistance
R1, resistance R2 and variable resistance RT meet relational expression R2/R1=RT/R0, and wherein the value of RT is corresponding resistance when needing temperature control
Value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370929.1U CN209433264U (en) | 2019-03-22 | 2019-03-22 | A kind of lambda sensor automatic temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370929.1U CN209433264U (en) | 2019-03-22 | 2019-03-22 | A kind of lambda sensor automatic temperature control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209433264U true CN209433264U (en) | 2019-09-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920370929.1U Active CN209433264U (en) | 2019-03-22 | 2019-03-22 | A kind of lambda sensor automatic temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209433264U (en) |
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2019
- 2019-03-22 CN CN201920370929.1U patent/CN209433264U/en active Active
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