CN109100042A - A kind of circuit of temperature sensing circuit and detection IGBT component temperature - Google Patents
A kind of circuit of temperature sensing circuit and detection IGBT component temperature Download PDFInfo
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- CN109100042A CN109100042A CN201811141280.2A CN201811141280A CN109100042A CN 109100042 A CN109100042 A CN 109100042A CN 201811141280 A CN201811141280 A CN 201811141280A CN 109100042 A CN109100042 A CN 109100042A
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- voltage
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- value
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
- G01K7/25—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
Abstract
The present invention relates to the circuits of a kind of temperature sensing circuit and detection IGBT component temperature, and temperature sensing circuit includes: the voltage input end being sequentially connected in series, thermistor, logarithmic operational circuit and voltage output end；Voltage input end and voltage output end are connected separately with a voltage check device；The calculator being separately connected with two voltage check devices.The embodiment of the present invention by voltage of the logarithmic operational circuit to thermistor output end by being handled; so that finally obtained voltage value curve corresponding with the temperature value that thermistor detects has the higher linearity; enhance sampling precision; simultaneously; since the voltage value after logarithm operation is smaller; by Numerical Control within the scope of calculator can identify, the effect of protection calculator is primarily served.
Description
Technical field
The present invention relates to temperature detection technical field more particularly to a kind of temperature sensing circuits and detection IGBT component temperature
Circuit.
Background technique
With steeply rising for Global Auto quantity, leading to the energy, there is a serious shortage in the supply, and environmental pollution is increasingly severe, suitably subtracts
The usage amount and the energy-saving and environment-friendly new energy motor of exploitation of few fuel oil vehicles become the inexorable trend of social development.With
The continuous development of power electronic devices, IGBT integration module mainly pass through control PWM duty cycle, DC current are become motor
Required alternating current size plays the role of respective feedback control, thus at motor-driven pith.
IGBT integration module is a temperature sensitive power electronic devices, therefore, in the mistake of new energy electric motor vehicle operation
Cheng Zhong needs to detect the temperature of IGBT in real time, and when being more than protection temperature to ensure IGBT once, electric vehicle can
With out of service at once, therefore the precision detected to IGBT temperature is improved, the security performance of electric vehicle can be improved.
When existing temperature detection technology detects IGBT component temperature by thermistor, obtained temperature and thermistor
Resistance value show cabling trend similar with logarithmic function, the linearity which is handled is lower, and line
Property degree is lower, when obtaining another variable by one of variable, mistake is more easy to appear, moreover, because the linearity
It is lower, to obtain correct variable, it must just use and be segmented look-up table to be operated, and it is segmented very few, it will lead to curve
The linearity is poorer, and segmentation is excessive, and the quantity that processor needs to table look-up is more, virtually increases the processing of processor in this way
Pressure is more difficult to measure by the resistance value of thermistor so the linearity between temperature and the resistance value of thermistor is lower
Correct temperature value.
Summary of the invention
Of the existing technology in order to solve the problems, such as, at least one embodiment of the present invention provides a kind of temperature detection electricity
The circuit on road and detection IGBT component temperature.
In a first aspect, the embodiment of the invention provides a kind of temperature sensing circuit, the detection circuit includes:
Voltage input end, thermistor, logarithmic operational circuit and the voltage output end being sequentially connected in series；
The voltage input end and the voltage output end are respectively connected with a voltage check device；
The calculator being all connected with two voltage check devices.
Based on the above-mentioned technical proposal, the embodiment of the present invention can also make following improvement.
With reference to first aspect, in the first embodiment of first aspect, the detection circuit further include: amplifier；
The both ends of the thermistor are separately connected the negative input and output end of the amplifier；
The electrode input end of the amplifier is grounded；The amplifier is by the voltage amplification of the thermistor output end.
The first embodiment with reference to first aspect, in second of embodiment of first aspect, the voltage input end
Protective resistance is additionally provided between the negative input of the amplifier.
Second of embodiment with reference to first aspect, in the third embodiment of first aspect, the calculator is specific
For:
The detection temperature value: is calculated by following calculation formula
Wherein, V01For the voltage value of the logarithmic operational circuit output end, VDFor diode in the logarithmic operational circuit
The voltage value at both ends, VTFor the voltage equivalent at the diode both ends；Us is defeated for the thermistor amplified by amplifier
The voltage value of outlet, R5 are the internal resistance of the logarithmic operational circuit, and Is is the reverse saturation current of the diode, and Ui is described
The voltage value of voltage input end, Rt are the resistance value of the thermistor, and R1 is the resistance value of the protective resistance, according to A
The constant coefficient that the material of the thermistor determines, B are the constant coefficient determined according to the material of the thermistor, and T is
The detection temperature value；
Following calculation formula is obtained according to above-mentioned calculation formula:
The voltage value of the voltage input end and voltage output end is substituted into above-mentioned calculation formula, the detection is calculated
Temperature value.
With reference to first aspect or the first or second kind embodiment of first aspect, in the 4th kind of embodiment of first aspect
In, the detection circuit further include:
Amplifying circuit between the logarithmic operational circuit and the voltage output end is set；The amplifying circuit is by institute
State the voltage amplification of logarithmic operational circuit output end.
The 4th kind of embodiment with reference to first aspect, in the 5th kind of embodiment of first aspect, the detection circuit is also
Include:
Clamping protective circuit between the amplifying circuit and the voltage output end is set.
The 5th kind of embodiment with reference to first aspect, in the 6th kind of embodiment of first aspect, the clamper protection electricity
The maximum value of the clamp voltage on road is 3V.
The third embodiment with reference to first aspect, in the 7th kind of embodiment of first aspect, the detection circuit is also
Include:
Amplifying circuit between the logarithmic operational circuit and the voltage output end is set；The amplifying circuit is to institute
State the voltage amplification of logarithmic operational circuit output end；
V0=α V01；
Wherein, V01The voltage of the logarithmic operational circuit output end；V0The voltage value of the voltage output end, α are described
The amplification factor of amplifying circuit.
Second aspect, the embodiment of the invention provides a kind of circuits for detecting IGBT component temperature, comprising: the IGBT member
Any temperature sensing circuit in part and above-mentioned first aspect.
The third aspect, the embodiment of the invention provides a kind of new energy electric motor vehicles, comprising: IGBT element and above-mentioned second party
The circuit of IGBT component temperature is detected described in face.
Above-mentioned technical proposal of the invention have the advantages that compared with prior art the embodiment of the present invention by by pair
Number computing circuit handles the voltage of thermistor output end, so that finally obtained voltage value and thermistor detected
The corresponding curve of temperature value has the higher linearity, enhances sampling precision, simultaneously as voltage value after logarithm operation compared with
It is small, by Numerical Control within the scope of calculator can identify, primarily serve the effect of protection calculator.
Detailed description of the invention
Fig. 1 is a kind of temperature sensing circuit structural schematic diagram provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides a kind of temperature sensing circuit structural schematic diagram；
Fig. 3 is a kind of temperature sensing circuit structural schematic diagram that further embodiment of this invention provides.
In figure, 1: voltage input end；2: thermistor；3: logarithmic operational circuit；4: voltage output end；5: amplifier；6:
Amplifying circuit；7: clamping protective circuit.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of temperature sensing circuit provided in an embodiment of the present invention, detection circuit include: to be sequentially connected in series
Voltage input end, thermistor, logarithmic operational circuit and voltage output end, thermistor are in contact with examined object, due to
The characteristic of thermistor shows different resistance values at a temperature of different.Posive temperature coefficient thermistor is when temperature is higher
Resistance value is bigger, and negative tempperature coefficient thermistor resistance value when temperature is higher is lower, according to the voltage and electricity of voltage input end
The voltage change of pressure output end can calculate the resistance value of corresponding thermistor, and in use, thermistor is at certain
Temperature and resistance value can be proportional in a temperature range, still, in entire temperature curve between thermistor resistance value and temperature
Relationship similar with logarithmic function cabling trend is presented, in the prior art according to thermistor detection temperature, temperature and resistance
The linearity that the logarithmic function relationship of value obtains is lower, and the linearity is the correlativity reflected between two variables and this phase
Spend closely a statistic for pass relationship, it is closer closer to 1, two variable；Closer to 0, then closed there is no linear
System, and the more high resistance value finally obtained according to voltage value of the linearity is more accurate, and the linearity between different variables is too low,
It must just be operated using segmentation look-up table, but segmentation is very few, the linearity that will lead to curve is poorer, if be segmented
It is more to may require that controller chip is tabled look-up more again, the processing pressure of control chip is virtually increased in this way, is increased and is executed
Unnecessary time when program wastes resources of chip, so, in the present embodiment, a logarithm operation of connecting after thermistor
Circuit carries out logarithm operation to the voltage value after thermistor, so that the line of final obtained temperature value and resistance value
Property degree level off to 1, to improve the precision by voltage value progress temperature detection.
As shown in Fig. 2, in the present embodiment, detection circuit further include: voltage input end and voltage output end are respectively connected with
One voltage check device；Voltage input end and voltage output end are separately connected a voltage check device, are examined by voltage
It surveys device and detects the voltage value of voltage input end and the voltage value of voltage output end respectively.It is all connected with two voltage check devices
Calculator；Calculator calculates the temperature-sensitive electricity of thermistor according to the voltage value of voltage input end and the voltage value of voltage output end
Resistance value, and detection temperature value is calculated according to thermosensitive resistance.
In the present embodiment, voltage check device can be integrated on one processor with the calculator, such as will be electric
Program in machine code in pressure detection chip and computing chip is integrated into a processor, to realize above-mentioned detection voltage input simultaneously
The voltage value at end and voltage output end, and according to the resistance of the voltage value of voltage input end and voltage output end calculating thermistor
Value, and corresponding temperature value is calculated according to thermosensitive resistance, realize the function of temperature detection.
In the present embodiment, detection circuit further include: amplifier；The both ends of thermistor are separately connected the cathode of amplifier
Input terminal and output end；The electrode input end of amplifier is grounded；Being converted the resistance value of thermistor to by amplifier can be with
The voltage signal of detection, is handled.
In the present embodiment, it is additionally provided with protective resistance between voltage input end and the negative input of amplifier, to keep away
When exempting from thermistor and damaging, circuit directly leads to line short, connects between voltage input end and thermistor
One protective resistance avoids line short that amplifier is caused to break down to protect circuit.
In the present embodiment, calculator is specifically used for: detection temperature value is calculated by following calculation formula:
First operational formulaFirst operational formula calculates logical
Cross the voltage value at the diode both ends that logarithm operation calculates in logarithmic operational circuit.
Second operational formulaSecond operational formula is thermistor after amplifying circuit acts on, heat
The voltage value of quick resistance subsequent conditioning circuit.
Third operational formulaThird operational formula is that thermistor varies with temperature function, for calculating
The temperature of thermistor.
4th operational formula4th operational formula is the voltage equivalent of diode in logarithmic operational circuit, is closed
It closes in circuit, since the potential difference that point-to-point transmission occurs there are the temperature difference is called thermal voltage, also referred to as the voltage equivalent of temperature, voltage
Equivalent is only related with temperature.
Wherein, V01For the voltage value of logarithmic operational circuit output end, VDFor the electricity at diode both ends in logarithmic operational circuit
Pressure value, VTFor the voltage equivalent at diode both ends；Us is the voltage value of the thermistor output end amplified by amplifier, and R5 is
The internal resistance of logarithmic operational circuit, Is are the reverse saturation current of diode, and Ui is the voltage value of voltage input end, and Rt is temperature-sensitive electricity
The resistance value of resistance, R1 are the resistance value of protective resistance, and A is the constant coefficient determined according to the material of thermistor, and B is according to heat
The constant coefficient that the material of quick resistance determines, T are detection temperature value.In the present embodiment, by above-mentioned second operational formula, third
Operational formula and the 4th operational formula substitute into the first operational formula, obtain following calculation formula according to above-mentioned calculation formula:Since A, B, R1, R5, Is are definite value, Ui can be set by the user defeated
Enter, when Ui is set any constant input value by user, V01It is in linear function, the line of voltage value and temperature value at this time with T
It is equal to 1 on property topology degree, after above-mentioned processing, it is easier to measure temperature by the voltage value of input terminal and output end
The right value of degree improves the utilization rate of resources of chip, improves the precision of New-energy electric vehicle IGBT module temperature sampling；
The internal resource of calculator has been saved, moreover, the voltage range that general calculator can identify can't be very big, such as
DSP handles chip, and the voltage range that can be identified is 0-3V, and V is voltage unit, and by logarithmic operational circuit, that treated is electric
Road voltage value can be greatly reduced, to protect calculator.
In the present embodiment, detection circuit further include: the amplification between logarithmic operational circuit and voltage output end is set
Circuit；Voltage amplification of the amplifying circuit to logarithmic operational circuit output end；
V0=α V01；
Wherein, V01The voltage of logarithmic operational circuit output end；V0The voltage value of voltage output end, α are putting for amplifying circuit
Big multiple.
The voltage value of voltage input end and voltage output end is substituted into above-mentioned calculation formula, detection temperature value is calculated.
As shown in figure 3, in the present embodiment, detection circuit further include: be arranged in logarithmic operational circuit and voltage output end
Between amplifying circuit；The voltage amplification of logarithmic operational circuit output end, voltage are being passed through logarithmic operational circuit by amplifying circuit
Afterwards, the value of the voltage of output end can be relatively low, although the voltage of logarithmic operational circuit output end is lower to can protect subsequent calculating
Device, the voltage value for avoiding calculator from receiving is excessively high to cause calculator to damage, but too low voltage value may also influence it is subsequent
Calculated result, for example, finally getable output voltage is 0.3V-0.6V to the input voltage of 5V, and general processing chip energy
Received voltage value generally in 0~3V, so, put in the present embodiment by the voltage for exporting logarithmic operational circuit
Greatly, the data of temperature sampling are handled convenient for processing chip.
In the present embodiment, detection circuit further include: the clamper protection between amplifying circuit and voltage output end is set
Circuit, clamping protective circuit clamps down on the current potential in the route after amplifying circuit, so that the clamper of clamping protective circuit
The maximum value of voltage is 3V, causes subsequent processing chip to damage to avoid voltage value is excessively high.
As shown in figure 3, the temperature sensing circuit includes: voltage the embodiment of the invention provides a kind of temperature sensing circuit
The voltage of input terminal is 5V, and the negative input of amplifier is connect with one end of protective resistance and thermistor, and amplifier is just
Pole input terminal is connected by resistance eutral grounding, the other end of thermistor and the output end of amplifier, and Us is the output end of amplifier
Voltage, the output end of amplifier connect with logarithmic operational circuit input terminal, V01For the voltage value of logarithmic operational circuit output end,
The output end of logarithmic operational circuit and the input terminal of amplifying circuit connect, and the output end of amplifying circuit is connect with voltage output end,
Clamp circuit is connected between the output end of amplifying circuit and voltage output end, and clamp circuit includes two poles of two positive connections
Pipe, in clamp circuit, diode cathode ground connection, then positive terminal circuit is clamped zero potential or less.
The embodiment of the invention provides a kind of circuits for detecting IGBT component temperature, comprising: IGBT element and any of the above-described
The temperature sensing circuit of embodiment.
In the present embodiment, temperature sensing circuit includes: the voltage input end, thermistor, logarithm operation being sequentially connected in series
Circuit and voltage output end.
In the present embodiment, temperature sensing circuit further include: voltage input end and voltage output end are respectively connected with an electricity
Press detection device.Temperature sensing circuit further include: the calculator being all connected with two voltage check devices.
In the present embodiment, temperature sensing circuit further include: amplifier；The both ends of thermistor are separately connected amplifier
Negative input and output end；The electrode input end of amplifier is grounded.
In the present embodiment, temperature sensing circuit further include: protection is additionally provided between voltage input end and thermistor
Resistance.
In the present embodiment, temperature sensing circuit further include: voltage input end and voltage output end are respectively connected with an electricity
Press detection device.Temperature sensing circuit further include: the calculator being all connected with two voltage check devices；Calculator is according to voltage
The voltage value of input terminal and the voltage value of voltage output end calculate the thermosensitive resistance of thermistor, and according to thermosensitive resistance meter
Calculate detection temperature value.
In the present embodiment, temperature sensing circuit further include: be arranged between logarithmic operational circuit and voltage output end
Amplifying circuit；Amplifying circuit is by the voltage amplification of logarithmic operational circuit output end.
In the present embodiment, temperature sensing circuit further include: the clamper between amplifying circuit and voltage output end is set
Protect circuit.
The embodiment of the invention provides a kind of new energy electric motor vehicles, comprising: IGBT element and above-mentioned detection IGBT element temperature
The circuit of degree.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of temperature sensing circuit, which is characterized in that the detection circuit includes:
Voltage input end, thermistor, logarithmic operational circuit and the voltage output end being sequentially connected in series；
The voltage input end and the voltage output end are connected separately with a voltage check device；
The calculator being separately connected with two voltage check devices.
2. temperature sensing circuit according to claim 1, which is characterized in that the detection circuit further include: amplifier；
The both ends of the thermistor are separately connected the negative input and output end of the amplifier；
The electrode input end of the amplifier is grounded；The amplifier is by the voltage amplification of the thermistor output end.
3. temperature sensing circuit according to claim 2, which is characterized in that the voltage input end and the amplifier
Protective resistance is additionally provided between negative input.
4. temperature sensing circuit according to claim 3, which is characterized in that the calculator passes through following calculation formula meter
Calculate the detection temperature value:
Wherein, V01For the voltage value of the logarithmic operational circuit output end, VDFor diode both ends in the logarithmic operational circuit
Voltage value, VTFor the voltage equivalent at the diode both ends；Us is the thermistor output end amplified by amplifier
Voltage value, R5 be the logarithmic operational circuit internal resistance, Is be the diode reverse saturation current, Ui be the voltage
The voltage value of input terminal, Rt are the resistance value of the thermistor, and R1 is the resistance value of the protective resistance, and A is according to
The constant coefficient that the material of thermistor determines, B are the constant coefficient determined according to the material of the thermistor, and T is described
Detect temperature value；
Following calculation formula is obtained according to above-mentioned calculation formula:
The voltage value of the voltage input end and voltage output end is substituted into above-mentioned calculation formula, the detection temperature is calculated
Value.
5. temperature sensing circuit according to claim 1 to 3, which is characterized in that the detection circuit further include:
Amplifying circuit between the logarithmic operational circuit and the voltage output end is set；The amplifying circuit will be described right
The voltage amplification of number computing circuit output end.
6. temperature sensing circuit according to claim 5, which is characterized in that the detection circuit further include:
Clamping protective circuit between the amplifying circuit and the voltage output end is set.
7. temperature sensing circuit according to claim 6, which is characterized in that the clamp voltage of the clamping protective circuit
Maximum value is 3V.
8. temperature sensing circuit according to claim 4, which is characterized in that the detection circuit further include:
Amplifying circuit between the logarithmic operational circuit and the voltage output end is set；The amplifying circuit is to described right
The voltage amplification of number computing circuit output end；
V0=α V01；
Wherein, V01The voltage of the logarithmic operational circuit output end；V0The voltage value of the voltage output end, α are the amplification
The amplification factor of circuit.
9. a kind of circuit for detecting IGBT component temperature characterized by comprising the IGBT element and such as claim 1-8
In any temperature sensing circuit.
10. a kind of new energy electric motor vehicle characterized by comprising IGBT element and detection IGBT member as claimed in claim 9
The circuit of part temperature.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811141280.2A CN109100042A (en) | 2018-09-28 | 2018-09-28 | A kind of circuit of temperature sensing circuit and detection IGBT component temperature |
| PCT/CN2018/122840 WO2020062646A1 (en) | 2018-09-28 | 2018-12-21 | Temperature detection circuit, circuit for detecting temperature of igbt element and new energy electric vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811141280.2A CN109100042A (en) | 2018-09-28 | 2018-09-28 | A kind of circuit of temperature sensing circuit and detection IGBT component temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109100042A true CN109100042A (en) | 2018-12-28 |
Family
ID=64867699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811141280.2A Pending CN109100042A (en) | 2018-09-28 | 2018-09-28 | A kind of circuit of temperature sensing circuit and detection IGBT component temperature |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109100042A (en) |
| WO (1) | WO2020062646A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202177471U (en) * | 2011-07-22 | 2012-03-28 | 深圳市鑫汇科电子有限公司 | IGBT temperature measuring circuit used for induction cooker |
| CN103148953A (en) * | 2013-02-02 | 2013-06-12 | 上海双电电气有限公司 | Temperature detecting circuit based on thermistor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2128579B1 (en) * | 2008-05-28 | 2012-08-01 | Sensata Technologies, Inc. | Arrangement for linearizing a non-linear sensor |
| CN105527035A (en) * | 2016-01-13 | 2016-04-27 | 中国东方电气集团有限公司 | IGBT module temperature detection circuit |
-
2018
- 2018-09-28 CN CN201811141280.2A patent/CN109100042A/en active Pending
- 2018-12-21 WO PCT/CN2018/122840 patent/WO2020062646A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202177471U (en) * | 2011-07-22 | 2012-03-28 | 深圳市鑫汇科电子有限公司 | IGBT temperature measuring circuit used for induction cooker |
| CN103148953A (en) * | 2013-02-02 | 2013-06-12 | 上海双电电气有限公司 | Temperature detecting circuit based on thermistor |
Non-Patent Citations (1)
| Title |
|---|
| 王安: ""热敏电阻无温漂对数线性化方法"", 《西安理工大学学报》 * |
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| WO2020062646A1 (en) | 2020-04-02 |
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