CN111157138A - Variable-range motor temperature sampling circuit - Google Patents
Variable-range motor temperature sampling circuit Download PDFInfo
- Publication number
- CN111157138A CN111157138A CN201911419235.3A CN201911419235A CN111157138A CN 111157138 A CN111157138 A CN 111157138A CN 201911419235 A CN201911419235 A CN 201911419235A CN 111157138 A CN111157138 A CN 111157138A
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- CN
- China
- Prior art keywords
- voltage division
- sampling circuit
- temperature sampling
- switch
- sampling
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
Abstract
The invention discloses a variable-range motor temperature sampling circuit, which comprises: the temperature sampling circuit comprises at least two voltage division sampling circuits with the same structure, wherein each voltage division sampling circuit comprises a switch, a range selection signal is input into one end of each switch, the other end of each switch is connected with one end of a voltage division resistor, and the other end of each voltage division resistor is connected with a temperature sampling unit; the divider resistors in each divider sampling circuit are different in size; the motor temperature sampling circuit is provided with at least two paths of voltage division sampling circuits, each path of voltage division sampling circuit adopts different voltage division resistors, and voltage division resistor channels are selected, so that the thermistor can obtain good sampling precision in a low resistance value area and a high resistance value area.
Description
Technical Field
The invention relates to the technical field of temperature sampling circuits of motors, in particular to a variable-range motor temperature sampling circuit.
Background
The new energy motor generally uses a thermistor (NTC) to sample the temperature of the motor. NTC is the change of resistance change in temperature range, and present bleeder circuit often adopts bleeder resistor all the way, only with the bleeder resistor of a fixed value, and thermistor is along with the change resistance of temperature is changing, however, because thermistor and series circuit's characteristic, hardly accomplish in the temperature gamut for voltage-temperature curve is relatively poor at low temperature district or high temperature district linearity, can cause temperature sampling error like this, leads to the control malfunction, and the system probably breaks down.
Disclosure of Invention
The invention provides a variable-range high-precision motor temperature sampling circuit, which aims to solve the problem that the errors of high-temperature detection and low-temperature detection of the conventional motor temperature sampling are large.
In order to achieve the above object, the present invention provides a variable-range motor temperature sampling circuit, including: the temperature sampling circuit comprises at least two voltage division sampling circuits with the same structure, wherein each voltage division sampling circuit comprises a switch, a range selection signal is input into one end of each switch, the other end of each switch is connected with one end of a voltage division resistor, and the other end of each voltage division resistor is connected with a temperature sampling unit; the divider resistors in each divider sampling circuit are different in size.
Preferably, the switch is a MOS transistor.
On the basis of the technical scheme, the source electrode of the MOS tube is connected with a power supply.
Furthermore, a resistor is connected between the source electrode and the grid electrode of the MOS tube.
As a preferable technical solution, the number of the voltage division sampling circuits is two, and the two voltage division sampling circuits are connected in parallel.
In the above preferred technical solution, the gates of the MOS transistors in the two voltage division sampling circuits share one range selection signal, and an inverter is connected between the gates of the two MOS transistors.
Further, the temperature sampling unit comprises an NTC for sampling the temperature of the motor.
As another preferable technical solution, the switch is a signal relay.
Compared with the prior art, the invention has the beneficial effects that: the motor temperature sampling circuit is provided with at least two paths of voltage division sampling circuits, each path of voltage division sampling circuit adopts different voltage division resistors, and voltage division resistor channels are selected, so that the thermistor can obtain good sampling precision in a low resistance value area and a high resistance value area.
Drawings
FIG. 1 is a circuit diagram of one embodiment of the present invention;
fig. 2 is a circuit diagram of another embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a variable-range motor temperature sampling circuit, which comprises at least two voltage division sampling circuits with the same structure, wherein each voltage division sampling circuit comprises a switch, in the embodiment, the switch adopts an MOS (metal oxide semiconductor) tube, but it needs to be noted that although the switch adopts the MOS tube in the embodiment, the protection range of the invention is not limited to the MOS tube, and other devices with smaller switch voltage drop are also in the protection range of the invention, such as a signal relay.
In this embodiment, the MOS transistor is used to selectively turn on or off the current voltage dividing channel, a range selection signal is input to a gate of the MOS transistor, and whether to turn on the MOS transistor is selected by the range selection signal, and the range selection signal may be implemented by a control chip, such as a single chip microcomputer.
The source electrode of the MOS tube is connected with a power supply, a resistor is connected between the source electrode and the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected with one end of a divider resistor, the other end of the divider resistor is connected with a temperature sampling unit, and the temperature sampling unit can adopt an NTC (negative temperature coefficient) which is used for sampling the temperature of the motor; the divider resistors in each divider sampling circuit are different in size, and the NTC in a low-temperature or high-temperature state is divided by adopting different resistance values of the divider resistors, so that the NTC is guaranteed to measure under normal voltage, and the precision is improved.
Example 1
In this embodiment, two voltage division sampling circuits are taken as an example for explanation, and the rest may be the same for the other voltage division sampling circuits.
As shown in fig. 1, in the present embodiment, the MOS transistors Q1 and Q2 are used for switching the voltage dividing channel, wherein when Q1 is turned on and Q2 is turned off, the voltage is divided by the NTC and R3, and the resistance of the NTC is measured, and the temperature corresponding to the resistance is the current temperature of the motor. When Q2 is turned on and Q1 is turned off, the resistance of the NTC can be measured by dividing the voltage of the NTC and R4. By properly selecting the resistance values of R3 and R4, the voltage division circuit of the NTC and R3 is suitable for measuring larger NTC resistance values, namely corresponding to temperature sampling at low temperature; the voltage division circuit of the NTC and R4 is suitable for measuring a smaller NTC resistance value, namely corresponding to temperature sampling at high temperature.
Example 2
As shown in fig. 2, the present embodiment is different from embodiment 1 in that, in the present embodiment, the number of the partial pressure sampling circuits is only two, and the two partial pressure sampling circuits are connected in parallel, gates of MOS transistors in the two partial pressure sampling circuits share one range selection signal, and an inverter is connected between the gates of the two MOS transistors, so that switching of the two MOS transistors can be completed by inputting one range selection signal, and the present embodiment has high precision and does not generate misoperation.
As shown in fig. 2, the level of the span selection signal is controlled by a main control chip such as a single chip. When 1 is input, Q2 is switched on, and Q1 is switched off; when 0 is input, Q1 is turned on, and Q2 is turned off. Thereby realizing the selection of the sampling range.
In the two examples, Q1 and Q2, the turn-on and turn-off processes are delayed, so that an invalid piece of data should be discarded during the application process.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (8)
1. A variable-range motor temperature sampling circuit is characterized by comprising: the temperature sampling circuit comprises at least two voltage division sampling circuits with the same structure, wherein each voltage division sampling circuit comprises a switch, a range selection signal is input into one end of each switch, the other end of each switch is connected with one end of a voltage division resistor, and the other end of each voltage division resistor is connected with a temperature sampling unit; the divider resistors in each divider sampling circuit are different in size.
2. The motor temperature sampling circuit of claim 1, wherein: the switch is an MOS tube.
3. The motor temperature sampling circuit of claim 2, wherein: the above-mentioned
And the source electrode of the MOS tube is connected with a power supply.
4. The motor temperature sampling circuit of claim 3, wherein: the above-mentioned
And a resistor is connected between the source electrode and the grid electrode of the MOS tube.
5. The motor temperature sampling circuit of claim 3, wherein: the number of the voltage division sampling circuits is two, and the two voltage division sampling circuits are connected in parallel.
6. The motor temperature sampling circuit of claim 5, wherein: the grids of the MOS tubes in the two voltage division sampling circuits share a range selection signal, and an inverter is connected between the grids of the two MOS tubes.
7. The motor temperature sampling circuit of claim 1, wherein: the temperature sampling unit comprises an NTC, and the NTC is used for sampling the temperature of the motor.
8. The motor temperature sampling circuit of claim 1, wherein: the switch is a signal relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419235.3A CN111157138A (en) | 2019-12-31 | 2019-12-31 | Variable-range motor temperature sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419235.3A CN111157138A (en) | 2019-12-31 | 2019-12-31 | Variable-range motor temperature sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111157138A true CN111157138A (en) | 2020-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201911419235.3A Pending CN111157138A (en) | 2019-12-31 | 2019-12-31 | Variable-range motor temperature sampling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113108936A (en) * | 2021-04-27 | 2021-07-13 | 广州小鹏汽车科技有限公司 | Temperature sampling device, motor and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140126608A1 (en) * | 2012-11-08 | 2014-05-08 | Honda Motor Co., Ltd. | Temperature detecting circuit |
| CN106687785A (en) * | 2014-09-29 | 2017-05-17 | 通用电气智能平台嵌入系统公司 | Resistance temperature detection with single current source current splitter |
| CN206709988U (en) * | 2017-03-07 | 2017-12-05 | 苏州汇川技术有限公司 | A kind of NTC motor temperatures sample circuit |
| CN107655588A (en) * | 2016-07-25 | 2018-02-02 | 宝沃汽车（中国）有限公司 | A kind of temperature multrirange device for accurately measuring and method |
| CN208568103U (en) * | 2018-07-25 | 2019-03-01 | 深圳和而泰小家电智能科技有限公司 | Temperature sensing circuit, temperature-detecting device and electronic equipment |
-
2019
- 2019-12-31 CN CN201911419235.3A patent/CN111157138A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140126608A1 (en) * | 2012-11-08 | 2014-05-08 | Honda Motor Co., Ltd. | Temperature detecting circuit |
| CN106687785A (en) * | 2014-09-29 | 2017-05-17 | 通用电气智能平台嵌入系统公司 | Resistance temperature detection with single current source current splitter |
| CN107655588A (en) * | 2016-07-25 | 2018-02-02 | 宝沃汽车（中国）有限公司 | A kind of temperature multrirange device for accurately measuring and method |
| CN206709988U (en) * | 2017-03-07 | 2017-12-05 | 苏州汇川技术有限公司 | A kind of NTC motor temperatures sample circuit |
| CN208568103U (en) * | 2018-07-25 | 2019-03-01 | 深圳和而泰小家电智能科技有限公司 | Temperature sensing circuit, temperature-detecting device and electronic equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113108936A (en) * | 2021-04-27 | 2021-07-13 | 广州小鹏汽车科技有限公司 | Temperature sampling device, motor and vehicle |
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Application publication date: 20200515 |
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| RJ01 | Rejection of invention patent application after publication |