CN220490249U - Motor temperature sensor detection circuit - Google Patents
Motor temperature sensor detection circuit Download PDFInfo
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- CN220490249U CN220490249U CN202321672724.1U CN202321672724U CN220490249U CN 220490249 U CN220490249 U CN 220490249U CN 202321672724 U CN202321672724 U CN 202321672724U CN 220490249 U CN220490249 U CN 220490249U
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Abstract
The utility model relates to the field of temperature detection, provides a motor temperature sensor detection circuit, and aims to solve the problems of accuracy and precision of current motor temperature detection. The motor temperature sensor detection circuit includes: the differential voltage circuit, the differential to single-ended circuit and the switch control circuit; the voltage dividing circuit is used for converting the temperature signal into signals with two different voltages; the differential-to-single-ended circuit is used for converting signals of two voltages at two ends of the divider resistor into single-ended voltage signals; the switch control circuit is used for matching the temperature sampling range set by the processor by controlling the voltage of the voltage dividing resistor in the voltage dividing circuit; the input end of the voltage dividing circuit is connected with the output end of the temperature sensor, and the output end of the voltage dividing circuit is connected with the input end of the differential-to-single-ended circuit; the output end of the differential-to-single-ended circuit is connected with the processor; the input end of the switch control circuit is connected with the processor, and the output end of the switch control circuit is connected with the voltage dividing circuit. The motor temperature sensor detection circuit is simple, low in cost, accurate in temperature measurement and high in accuracy.
Description
Technical Field
The utility model relates to the field of driving of power devices of electric automobiles, in particular to a detection circuit of a motor temperature sensor.
Background
In the motor driver, the internal temperature of the motor has a great influence on the safety and the working efficiency of the motor in the working process, so that the temperature of the motor is timely detected by a motor temperature sensor detection circuit.
At present, the common motor temperature detection circuits all adopt a simple resistance voltage division mode, however, the temperature range of the motor is greatly changed and is generally within the range of-40 ℃ to 200 ℃; meanwhile, the temperature sensor has a large resistance value change range from tens of ohms to thousands of kiloohms. Therefore, the same set of sampling detection circuit is difficult to ensure the sampling precision requirement in a large range, and has a great hidden trouble for protecting the temperature of the motor.
Therefore, a simple circuit structure is needed, the temperature of the IGBT device and the temperature of the board card are detected timely and accurately, the IGBT driver with low comprehensive cost is needed, and the problems that the motor temperature detection instantaneity is poor and the protection is not timely when the current IGBT driver is used in overload are solved.
Disclosure of Invention
In order to solve the problems in the prior art, namely, the problem of low temperature detection precision caused by large temperature range and large variation of the resistance interval of the sampling resistor in the motor temperature detection circuit is solved. The utility model adopts the following technical scheme to solve the problems:
the application provides a motor temperature sensor detection circuitry, this motor temperature sensor detection circuitry includes: the differential voltage circuit, the differential to single-ended circuit and the switch control circuit; the voltage dividing circuit is used for converting a temperature signal detected by the temperature sensor into signals with two different voltages; the differential-to-single-ended circuit is used for converting signals of two different voltages output by the voltage dividing circuit into single-ended voltage signals; the switch control circuit is used for matching the temperature sampling range set by the processor by controlling the voltage of the voltage dividing resistor divided into the voltage dividing circuit; the input end of the voltage dividing circuit is connected with the output end of the temperature sensor, the output end of the voltage dividing circuit is connected with the input end of the differential-to-single-ended circuit, the output end of the differential-to-single-ended circuit is connected with the processor, the input end of the switch control circuit is connected with the processor, and the output end of the switch control circuit is connected with the voltage dividing circuit.
In some examples, the voltage dividing circuit includes a first resistor, a second resistor, and the voltage dividing resistor, where a first end of the voltage dividing resistor is connected to a positive output terminal of the temperature sensor, and a second end of the voltage dividing resistor is connected to a negative output terminal of the temperature sensor; one end of the first resistor is positively connected with a power supply, and the other end of the first resistor is connected with a positive output end of the temperature sensor; one end of the second resistor is connected with the power ground, and the other end of the second resistor is connected with the negative output end of the temperature sensor.
In some examples, the voltage divider circuit further comprises a first controllable voltage divider branch and a second controllable voltage divider branch, wherein: the first controllable voltage dividing branch circuit comprises a third resistor and a sixth resistor, one end of the third resistor is connected with a first power supply positive V1, the other end of the third resistor is connected with a first end of the voltage dividing resistor, one end of the sixth resistor is connected with a first power supply ground GND1, and the other end of the sixth resistor is connected with a second end of the voltage dividing resistor; the second controllable voltage dividing branch circuit comprises a fourth resistor and a seventh resistor, one end of the fourth resistor is connected with a second power supply positive V2, the other end of the fourth resistor is connected with the first end of the voltage dividing resistor, one end of the seventh resistor is connected with a second power supply ground GND2, and the other end of the seventh resistor is connected with the second end of the voltage dividing resistor; the first power positive V1, the second power positive V2, the first power ground GND1 and the second power ground GND2 are voltage signals output by the switch control circuit.
In some examples, the differential-to-single-ended circuit includes an operational amplifier, an in-phase feedback branch, and an out-of-phase feedback branch, where an in-phase input of the operational amplifier is connected to a positive output of the temperature sensor through an eighth resistor, and an out-of-phase input of the operational amplifier is connected to a negative output of the temperature sensor through a ninth resistor; the in-phase feedback branch circuit is connected between the in-phase input end of the operational amplifier and the power ground; the outphasing feedback branch is connected between the outphasing input end of the operational amplifier and the output end of the operational amplifier; the in-phase conversion branch circuit is used for forming a voltage dividing circuit of in-phase input by the eighth resistor connected with the in-phase conversion branch circuit and controlling the input voltage of the in-phase input end; the outphasing conversion branch circuit is used for carrying out negative feedback control on the voltage of the output end of the operational amplifier.
In some examples, the in-phase feedback branch includes a tenth resistor, an eleventh resistor, and a first capacitor, where the tenth resistor and the eleventh resistor are connected in series and then connected in parallel with the first capacitor; the outphasing feedback branch comprises a twelfth resistor, a thirteenth resistor and a second capacitor, wherein the twelfth resistor and the thirteenth resistor are connected in series and then connected in parallel with the second capacitor.
In some examples, the non-inverting input of the operational amplifier is further coupled to a clamp control of the first clamp diode, and the outphasing input of the operational amplifier is further coupled to a clamp control of the second clamp diode.
In some examples, the switch control circuit includes a first switch control branch that outputs the first power supply positive V1 or the second power supply positive V2 according to information of the processor; the input end of the first switch control branch is connected with an output switch of the processor, and the output end of the first switch control branch is connected with the positive electrode of the power supply of the first controllable voltage dividing branch or the second controllable voltage dividing branch; wherein: the first switch control branch circuit comprises a first triode Q1 and a first MOS tube Q2, and an emitter of the first triode Q1 is connected with a power supply ground GND; the base electrode of the first triode Q1 is connected with the output end of the processor through a fifteenth resistor and is connected with the power ground GND through a sixteenth resistor; the collector electrode of the first triode Q1 is connected to the 5V positive electrode of the power supply through a seventeenth resistor and is connected with the grid electrode of the first MOS tube through an eighteenth resistor; the drain electrode of the first MOS transistor Q2 is connected to the positive electrode of the power supply 5V, and the source electrode of the first MOS transistor Q2 is connected to the first power supply.
In some examples, the switch control circuit includes a second switch control branch outputting the first power ground GND1 or the second power ground GND2 according to information of the processor; the input end of the second switch control branch is connected with an output switch of the processor, and the output of the second switch control branch is connected with the power ground of the first controllable voltage dividing branch or the second controllable voltage dividing branch; wherein: the second switch control branch circuit comprises a second MOS tube Q3, a nineteenth resistor, a twentieth resistor and an eighth capacitor; after the twentieth resistor and the eighth capacitor are connected in parallel, one end of the twentieth resistor is connected to the gate of the second MOS transistor Q3, and the other end of the twentieth resistor is connected to the power ground GND; one end of the nineteenth resistor is connected to the output switch of the processor, and the other end of the nineteenth resistor is connected to the grid electrode of the second MOS tube Q3; the source electrode of the second MOS transistor Q3 is connected with the power ground GND; the drain electrode of the second MOS transistor Q3 is connected to the first power supply ground.
In the motor temperature sensor detection circuit, the differential-to-single-ended circuit converts the voltages at two ends of the voltage dividing resistor into the voltage value taking the internal power ground as the standard level, so that the standards on which the temperature measurement is based are consistent, and the measurement accuracy is improved; the controllable voltage dividing branch circuit can be selectively connected into the voltage dividing loop through the voltage dividing branch circuits with different resistance values under the control of the processor, and is cut into different voltage dividing branch circuits in different temperature ranges, so that the accuracy of temperature detection is improved. Meanwhile, as the circuit of each branch of the detection circuit of the motor temperature sensor is simple, the device is a common circuit element, and the control cost is low.
Drawings
FIG. 1 is a schematic diagram of an exemplary motor temperature sensor detection circuit in an embodiment of the present application;
FIG. 2 is a circuit diagram of a motor temperature sensor detection circuit in an embodiment of the present application;
FIG. 3 is a circuit diagram of a first switch control circuit outputting a first power supply positive SV1 in an embodiment of the present application;
FIG. 4 is a circuit diagram of a first switch control circuit outputting a second power supply positive SV2 in an embodiment of the present application;
fig. 5 is a circuit diagram of the second switch control circuit outputting the first power ground GND1 in the embodiment of the present application;
fig. 6 is a circuit diagram of the second switch control circuit outputting the second power ground GND2 in the embodiment of the present application.
Detailed Description
Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 shows a system configuration diagram of an exemplary motor temperature sensor detection circuit that may be applied to embodiments of the present application.
As shown in fig. 1, a system applied to a motor temperature sensor detection circuit provided in an embodiment of the present application includes: the motor temperature sensor detects circuit 1, temperature sensor 2 and processor 3. The temperature sensor 2 is disposed in the motor to be detected, samples the temperature in the motor according to the resistance change of the detection resistor buried in the motor, and the temperature sensor 2 may be a PT100/PT1000/KTY84/NTC motor temperature sensor. The motor temperature sensor detection circuit 1 converts the voltage value into a voltage value in a set area according to the change of the resistance value of the sampling resistor of the temperature sensor 2, and the processor 3 converts the voltage value output by the motor temperature sensor detection circuit 1 into a temperature value in the set area.
In this embodiment, the ports of the temperature sensor 2 for outputting temperature information are mtemp+ and MTEMP-, respectively, and are also the input terminals of the motor temperature sensor detection circuit 1. The output signal of the motor temperature sensor detection circuit 1 is mtemp_adc, and is also the input end of the processor 3, and further, the processor 3 controls the temperature measurement range detected by the motor temperature sensor detection circuit 1 through a change-over switch.
Further, referring to fig. 2, fig. 2 is a circuit diagram of a motor temperature sensor detection circuit in an embodiment of the present application. As shown in fig. 2, the motor temperature sensor detection circuit 1 includes a voltage dividing circuit 11, a differential to single-ended circuit 12, and a switch control circuit 13.
The input end of the voltage dividing circuit 11 is connected with the output ends MTEMP+ and MTEMP-of the temperature sensor, and the output end of the voltage dividing circuit is connected with the input end of the differential-to-single-ended circuit 12. The output end of the differential-to-single-ended circuit 12 is connected to the processor 3, the input end of the switch control circuit 13 is connected to the processor 3, and the output end of the switch control circuit 13 is connected to the voltage dividing circuit.
The voltage dividing circuit 11 is used for converting temperature signals output by the MTEMP+ port and the MTEMP-port of the output end of the temperature sensor into voltage signals with two different voltages V1 and V2. The differential-to-single-ended circuit 12 is configured to convert two voltage signals V1 and V2 output by the voltage divider 11 into a single-ended voltage signal Vo. The single-ended voltage signal Vo is input to the processor 3 through the output port mtemp_adc, and the processor 3 processes the input voltage signal Vo and converts the voltage signal Vo into temperature data of the motor. The switch control circuit 13 is configured to match the range of temperature sampling set by the processor 3 by controlling the voltage divided to the voltage dividing resistor in the voltage dividing circuit 11.
In this embodiment, the voltage dividing circuit 11 includes a first resistor R1, a second resistor R2, and the voltage dividing resistor R5. The first end of the voltage dividing resistor R5 is connected with the positive output end MTEMP+ of the temperature sensor, and the second end of the voltage dividing resistor R5 is connected with the negative output end MTEMP-of the temperature sensor. One end of the first resistor R1 is connected to the power source, and the other end of the first resistor R1 is connected to the positive output terminal mtemp+ of the temperature sensor. One end of the second resistor R2 is connected to the power ground, and the other end of the second resistor R2 is connected to the negative output terminal MTEMP of the temperature sensor. It will be appreciated that the power supply is providing +5v power to the control system and the ground provides ground power GND to the control system.
Further, the voltage dividing circuit 11 further includes a first controllable voltage dividing branch and a second controllable voltage dividing branch. Wherein: the first controllable voltage dividing branch circuit includes a third resistor R3 and a sixth resistor R6, one end of the third resistor R3 is connected to the first power supply positive SV1, the other end of the third resistor R3 is connected to the first end of the voltage dividing resistor R5, one end of the sixth resistor R6 is connected to the first power supply ground GND1, and the other end of the sixth resistor R6 is connected to the second end of the voltage dividing resistor R5. The second controllable voltage dividing branch circuit includes a fourth resistor R4 and a seventh resistor R7, one end of the fourth resistor R4 is connected to the second power supply positive SV2, the other end of the fourth resistor R4 is connected to the first end of the voltage dividing resistor R5, one end of the seventh resistor R7 is connected to the second power supply ground GND2, and the other end of the seventh resistor R7 is connected to the second end of the voltage dividing resistor R5.
The first power supply positive SV1, the second power supply positive SV2, the first power supply ground GND1, and the second power supply ground GND2 are voltage signals output from the switch control circuit. Because the resistance values of the resistors in the first controllable voltage dividing branch and the first controllable voltage dividing branch are different, by changing or suspending the voltage values of the first power supply positive SV1, the second power supply positive SV2, the first power supply ground GND1 and the second power supply ground GND2, a certain loop is connected into the voltage dividing circuit to control the voltage values of the voltage dividing resistors, thereby realizing detection of different temperature ranges and realizing switching of measurement ranges.
On the basis of the circuit, the extension of the controllable branch can be further performed. The first power supply positive SV1, the second power supply positive SV2, the first power supply ground GND1 and the second power supply ground GND2 are controlled to be connected or disconnected to be combined to form different controllable voltage dividing branches, so that different measuring ranges are adapted to the different controllable voltage dividing branches, and the measuring precision is improved. For example, the processor makes the first power supply positive SV1 and the second power supply ground GND2 effective through instruction output or switch control, forming a voltage dividing branch of the power supply positive SV 1-resistor R3-resistor R5-resistor R7-power supply ground GND 2; and, the second power supply positive SV2 and the first power supply ground GND1 are enabled to be effective, and a voltage dividing branch of the power supply positive SV2, the resistor R4, the resistor R5, the resistor R6 and the power supply ground GND1 is formed.
In this embodiment, the differential-to-single-ended circuit 12 includes an operational amplifier U1, an in-phase feedback branch and an out-of-phase feedback branch. The non-inverting input terminal of the operational amplifier U1 is connected with the positive output terminal MTEMP+ of the temperature sensor through an eighth resistor R8, and the outphasing input terminal of the operational amplifier U1 is connected with the negative output terminal MTEMP-of the temperature sensor through a ninth resistor R9. The in-phase feedback branch circuit is connected between the in-phase input end of the operational amplifier U1 and the power ground GND; the outphasing feedback branch is connected between the outphasing input terminal of the operational amplifier U1 and the output terminal of the operational amplifier U1.
As can be seen from the circuit shown in fig. 2, the voltage V1 at the first end of the voltage dividing resistor R5 is input to the non-inverting input terminal of the operational amplifier U1 through the eighth resistor R8; the voltage V2 at the second end of the voltage dividing resistor R5 is input to the outphasing input end of the operational amplifier U1 through a ninth resistor R9. The operational amplifier U1 converts the input V1 and V2, and outputs the converted voltage signal through its output terminal. Specifically, the voltage VO at the output terminal has a certain correspondence with the voltages V1 and V2, and the correspondence is determined by the in-phase feedback branch and the out-phase feedback branch.
The in-phase feedback branch and the eighth resistor R8 connected with the in-phase feedback branch form a voltage dividing circuit for in-phase input, and the input voltage of the in-phase input end is controlled. The outphasing conversion branch and the ninth resistor R9 connected with the outphasing conversion branch form a voltage dividing circuit of outphasing input, and negative feedback control is carried out on the voltage of the output end of the operational amplifier U1.
In this embodiment, the in-phase feedback branch includes a tenth resistor R10, an eleventh resistor R11, and a fifth capacitor C5, where the tenth resistor R10 and the eleventh resistor R11 are connected in series and then connected in parallel with the fifth capacitor C5. The outphasing feedback branch comprises a twelfth resistor R12, a thirteenth resistor R13 and a sixth capacitor C6, wherein the twelfth resistor R12 and the thirteenth resistor R13 are connected in series and then connected in parallel with the sixth capacitor C6.
Further, the differential to single-ended circuit 12 further includes a first clamping diode D1 and a second clamping diode D2 for limiting voltages input to the non-inverting input terminal and the outphasing input terminal of the operational amplifier U1. The clamping control end of the first clamping diode D1 is connected with the non-inverting input end of the operational amplifier U1; the clamping control terminal of the second clamping diode D2 is connected to the outphasing input terminal of the operational amplifier U1. In this embodiment, the first terminal of the input terminal of the clamping power supply of the first clamping diode D1 and the second terminal of the clamping power supply of the second clamping diode D2 are connected to the +5v power supply, and the second terminal is connected to the ground terminal GND.
Further, in order to reduce the interference of the temperature signal input by the temperature sensor to the voltage dividing circuit and the differential-to-single-ended circuit, a first filter circuit is arranged between the temperature sensor and the voltage dividing circuit; in order to reduce the interference of the input voltage signal to the processor, a second filter circuit is arranged between the operational amplifier U1 and the output port MTEMP_ADC. The first filter circuit includes a first capacitor C1, a second capacitor C2, and a fourth capacitor C4. The first capacitor C1 is arranged between the output end MTEMP+ of the temperature sensor and the power ground GND; the second capacitor C2 is arranged between the output end MTEMP-of the temperature sensor and the power ground GND; the fourth capacitor C4 is disposed between the output terminal mtemp+ and the output terminal MTEMP-of the temperature sensor. The second filter circuit includes a seventh capacitor C7 and a fourteenth resistor. The operational amplifier U1 and the output port mtemp_adc are connected through the fourteenth resistor R14, and the seventh capacitor C7 is connected between the output port mtemp_adc and the power ground GND. The seventh capacitor C7 and the fourteenth resistor R14 form a low-pass filter, so as to reduce external or in-board interference from entering the processor. And a clamping diode D3 is arranged between the output port MTEMP_ADC and the processor 3, wherein a control end of the clamping diode D3 is connected with the output port MTEMP_ADC and used for clamping protection, so that excessive voltage is prevented from entering the processor and the processor is protected.
Referring to fig. 3 and 4, fig. 3 is a circuit diagram of the first switch control circuit outputting the first power supply positive SV1 in the embodiment of the present application, and fig. 4 is a circuit diagram of the first switch control circuit outputting the second power supply positive SV2 in the embodiment of the present application.
In this embodiment, the switch control circuit includes a first switch control branch that outputs the first power supply positive SV1 and/or the second power supply positive SV2 according to the information of the processor. As shown in fig. 3, an input terminal of the first switch control branch is connected to an output switch mts_swa of the processor 3, and an output terminal of the first switch control branch is connected to a power supply positive electrode SV1 of the first controllable voltage dividing branch.
In the circuit for outputting the power supply anode SV1 by the first switch control branch, the branch comprises a first triode Q1 and a first MOS tube Q2, wherein the emitter of the first triode Q1 is connected with the power supply ground GND; the base of the first triode Q1 is connected to the output terminal mts_swa of the processor through a fifteenth resistor R15, and is connected to the power ground GND through a sixteenth resistor R16; the collector of the first triode Q1 is connected to the positive electrode of the power supply 5V through a seventeenth resistor R17, and is connected with the grid electrode of the first MOS tube Q2 through an eighteenth resistor R18; the drain electrode of the first MOS transistor Q2 is connected to the positive electrode of the power supply 5V, and the source electrode of the first MOS transistor Q2 is connected to the first power supply positive SV1 as the output end of the branch. The processor 3 controls the on/off of the first transistor Q1 and the first MOS transistor Q2 through the output switch mts_swa, so as to control the voltage of the first power source positive SV1 output by the source of the first MOS transistor Q2, so that the voltage of the first power source positive SV1 is a certain set voltage value (e.g. 10V, 8V or 5V), 0V or suspended. Thereby controlling the first controllable voltage dividing branch to be conducted to change the voltage of the voltage dividing inverting and dividing resistor R5, or controlling the first controllable voltage dividing branch to be disconnected.
Further, with reference to fig. 4, it will be appreciated that the principle and function of the circuit shown in fig. 4 is the same as or similar to the circuit shown in fig. 3. The input end of the first switch control branch is connected with an output switch MTS_SWB of the processor 3, and the output end of the first switch control branch is connected with a power supply positive electrode SV2 of the second controllable voltage dividing branch.
In the circuit for outputting the power supply anode SV2 of the first switch control branch, the branch includes a fourth triode Q4 and a third MOS tube Q5. An emitter of the fourth transistor Q4 is connected to the power ground GND. The base of the fourth triode Q4 is connected to the output terminal mts_swb of the processor 3 through a resistor R21 and to the power ground GND through a resistor R22; the collector of the fourth triode Q4 is connected to the positive electrode of the power supply 5V through a resistor R23 and is connected with the grid electrode of the third MOS tube Q5 through a resistor R24; the drain electrode of the third MOS transistor Q5 is connected to the positive electrode of the power supply 5V, and the source electrode of the second MOS transistor Q5 is connected to the second power supply positive SV1 as the output end of the branch. The processor 3 controls the fourth transistor Q4 and the third MOS transistor Q5 to be turned on or off through the output switch mts_swb, so as to control the voltage of the second power positive SV2 output from the source of the third MOS transistor Q5. The second power supply positive SV2 is a second controllable voltage dividing branch circuit, and the voltage of the voltage dividing and inverting resistor R5 is changed according to the difference of the voltage of the second power supply positive SV2 so as to adapt to different temperature ranges.
Further, referring to fig. 5 and 6, fig. 5 is a circuit diagram of the second switch control circuit outputting the first power ground GND1 in the embodiment of the present application; fig. 6 is a circuit diagram of the second switch control circuit outputting the second power ground GND2 in the embodiment of the present application.
In this embodiment, the switch control circuit includes a second switch control branch. The second switch control branch outputs the first power ground GND1 and/or the second power ground GND2 according to the information of the processor 3.
As shown in fig. 5, the second switch control branch controls the voltage of the first power ground GND1 according to the information of mts_swa of the processor 3. The input of the branch is connected to the output switch mts_swa of the processor 3 and the output of the branch is connected to the first power supply ground GND1 of the first controllable voltage dividing branch. Specifically:
the second switch control branch circuit comprises a second MOS tube Q3, a nineteenth resistor R19, a twentieth resistor 20 and an eighth capacitor C8; after the twenty-first resistor R20 and the eighth capacitor C8 are connected in parallel, one end is connected to the gate of the second MOS transistor Q3, and the other end is connected to the power ground GND; one end of the nineteenth resistor R19 is connected to the output switch mts_swa of the processor 3, and the other end is connected to the gate of the second MOS transistor Q3; the source electrode of the second MOS transistor Q3 is connected with the power ground GND; the drain of the second MOS transistor Q3 is connected to the first power ground GND 1. In this branch, the input terminal is connected to the processor switch mts_swa, and the output terminal is connected to the first controllable voltage dividing branch for the first power ground GND 1.
The on/off of the processor switch mts_swa can control the voltage of the first power supply SV1 in the first switch control branch in the circuit shown in fig. 3 and the voltage of the first power supply ground GND1 in the second switch control branch in the circuit shown in fig. 5, so that the first controllable voltage dividing branch is connected or disconnected.
As shown in fig. 6, the second switch control branch controls the voltage of the second power ground GND2 according to the information of mts_swb of the processor 3. Specifically, the second switch control branch includes a MOS transistor Q6, a resistor R25, a resistor 26, and a capacitor C9. After the resistor R26 and the 6 capacitor C9 are connected in parallel, one end of the resistor R is connected to the grid electrode of the MOS tube Q6, and the other end of the resistor R is connected to the power ground GND; one end of the resistor R25 is connected to the output switch MTS_SWB of the processor 3, and the other end is connected to the grid electrode of the MOS tube Q6; the source electrode of the MOS transistor Q6 is connected with the power ground GND; the drain of the MOS transistor Q6 is connected to the second power ground GND2. In the circuit shown in fig. 6, the input terminal is connected to the processor switch mts_swb, and the output terminal is connected to the second controllable voltage dividing branch for the second power ground GND2. The on/off of the processor switch mts_swb can control the second power supply SV2 in the second switch control branch in the circuit shown in fig. 4 and control the voltage of the second power supply ground GND2 in the second switch control branch in the circuit shown in fig. 6, so as to switch on or off the second controllable voltage dividing branch.
The application has the following beneficial effects:
the voltage dividing circuit converts the signal detected by the temperature sensor into a voltage signal which is convenient for metering and linear transformation.
The operational amplifier in the differential-to-single-ended circuit amplifies the voltages at two ends of the voltage dividing resistor, converts two voltage values input by the in-phase input end and the out-of-phase input end into standard voltages relative to an internal grounding power supply, and outputs the standard voltages to the processor for temperature calibration. Such that the voltage at the nominal temperature is based on the internal ground power supply variation of the reference.
The controllable voltage dividing branch circuit is arranged in the voltage dividing circuit, and the resistances of the resistors connected in the branch circuits are different and the power supply voltages are different. The first branch is connected with a resistor R < 3+ > R < 5+ > R < 6 >, and the power supply voltage is SV1-GND1; the resistor connected in the branch II is R4+R5+R7, and the power supply voltage is SV2-GND2. The processor can change the power supply voltage SV1-GND1 or SV2-GND2 by controlling the switch, so that the branch I or the branch II can be selectively connected into the voltage dividing circuit to change the voltage at two ends of the voltage dividing resistor.
The switch control circuit may control the values of the power supply terminals SV1 and/or SV2 and the values of the output terminals GND1 and/or GND2, so that the power supplies SV1-GND1, SV2-GND2 are active or suspended to control the access of the controllable voltage division.
The processor instructs the output switches MTS_SWA and MTS_SWB to be turned on or off by instructions to control the voltage output by the switching circuit.
The first switch control branch and the second switch control branch may control the values of the output terminals SV1 and/or SV2 thereof and the values of the output terminals GND1 and/or GND2 in the on or off state (high voltage or low voltage) of the output switch to change the range of temperature detection.
A filter circuit is arranged between the voltage dividing circuit and the output end of the temperature sensor to restrain temperature disturbance signals caused by motor interference.
Therefore, in the motor temperature sensor detection circuit, the voltage at two ends of the voltage dividing resistor is converted into standard ground voltage through the differential-to-single-ended circuit, so that the temperature detection result is accurate; the processor adjusts the voltage or resistance value of the voltage dividing resistor by switching the controllable voltage dividing branch, and the corresponding detection temperature ranges are matched, so that the accuracy of the detection temperature is improved. The circuit of each branch of the detection circuit of the motor temperature sensor is simple, the device is a common circuit element, and the cost is low.
Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.
Claims (8)
1. A motor temperature sensor detection circuit, characterized in that the motor temperature sensor detection circuit comprises: the differential voltage circuit, the differential to single-ended circuit and the switch control circuit; the voltage dividing circuit is used for converting a temperature signal detected by the temperature sensor into signals with two different voltages; the differential-to-single-ended circuit is used for converting signals of two different voltages output by the voltage dividing circuit into single-ended voltage signals; the switch control circuit is used for matching the temperature sampling range set by the processor by controlling the voltage of the voltage dividing resistor divided into the voltage dividing circuit;
the input end of the voltage dividing circuit is connected with the output end of the temperature sensor, the output end of the voltage dividing circuit is connected with the input end of the differential-to-single-ended circuit, the output end of the differential-to-single-ended circuit is connected with the processor, the input end of the switch control circuit is connected with the processor, and the output end of the switch control circuit is connected with the voltage dividing circuit.
2. The motor temperature sensor detection circuit of claim 1, wherein the voltage dividing circuit comprises a first resistor, a second resistor and the voltage dividing resistor, the first end of the voltage dividing resistor is connected with the positive output end of the temperature sensor, and the second end of the voltage dividing resistor is connected with the negative output end of the temperature sensor; one end of the first resistor is positively connected with a power supply, and the other end of the first resistor is connected with a positive output end of the temperature sensor; one end of the second resistor is connected with power ground, and the other end of the second resistor is connected with the negative output end of the temperature sensor.
3. The motor temperature sensor detection circuit of claim 2, wherein the voltage divider circuit further comprises a first controllable voltage divider branch and a second controllable voltage divider branch, wherein:
the first controllable voltage dividing branch circuit comprises a third resistor and a sixth resistor, one end of the third resistor is connected with a first power supply positive SV1, the other end of the third resistor is connected with a first end of the voltage dividing resistor, one end of the sixth resistor is connected with a first power supply ground GND1, and the other end of the sixth resistor is connected with a second end of the voltage dividing resistor;
the second controllable voltage dividing branch comprises a fourth resistor and a seventh resistor, one end of the fourth resistor is connected with a second power supply positive V2, the other end of the fourth resistor is connected with the first end of the voltage dividing resistor, one end of the seventh resistor is connected with a second power supply ground GND2, and the other end of the seventh resistor is connected with the second end of the voltage dividing resistor;
the first power supply positive SV1, the second power supply positive SV2, the first power supply ground GND1 and the second power supply ground GND2 are voltage signals output by the switch control circuit.
4. The motor temperature sensor detection circuit according to claim 3, wherein the differential-to-single-ended circuit comprises an operational amplifier, an in-phase feedback branch and an out-of-phase feedback branch, wherein an in-phase input end of the operational amplifier is connected with a positive output end of the temperature sensor through an eighth resistor, and an out-of-phase input end of the operational amplifier is connected with a negative output end of the temperature sensor through a ninth resistor; the in-phase feedback branch is connected between the in-phase input end of the operational amplifier and the power ground; the outphasing feedback branch is connected between the outphasing input end of the operational amplifier and the output end of the operational amplifier; wherein,
the in-phase feedback branch is used for forming a voltage dividing circuit of in-phase input by the eighth resistor connected with the in-phase feedback branch and controlling the input voltage of the in-phase input end;
the outphasing feedback branch is used for carrying out negative feedback control on the voltage of the output end of the operational amplifier.
5. The motor temperature sensor detection circuit according to claim 4, wherein the in-phase feedback branch includes a tenth resistor, an eleventh resistor, and a first capacitor, the tenth resistor and the eleventh resistor being connected in series and then connected in parallel with the first capacitor;
the outphasing feedback branch comprises a twelfth resistor, a thirteenth resistor and a second capacitor, wherein the twelfth resistor and the thirteenth resistor are connected in series and then connected in parallel with the second capacitor.
6. The motor temperature sensor detection circuit of claim 5, wherein the non-inverting input of the operational amplifier is further coupled to a clamp control terminal of a first clamp diode, and the outphasing input of the operational amplifier is further coupled to a clamp control terminal of a second clamp diode.
7. The motor temperature sensor detection circuit of claim 6, wherein the switch control circuit comprises a first switch control branch that outputs the first power supply positive SV1 and/or the second power supply positive SV2 according to information of the processor;
the input end of the first switch control branch is connected with an output switch of the processor, and the output end of the first switch control branch is connected with the positive electrode of the power supply of the first controllable voltage dividing branch or the second controllable voltage dividing branch; wherein:
the circuit for outputting the first power supply positive SV1 by the first switch control branch circuit comprises a first triode Q1 and a first MOS tube Q2, wherein an emitter of the first triode Q1 is connected with a power supply ground GND; the base electrode of the first triode Q1 is connected with the output end of the processor through a fifteenth resistor and is connected with the power ground GND through a sixteenth resistor; the collector electrode of the first triode Q1 is connected to the 5V positive electrode of the power supply through a seventeenth resistor and is connected with the grid electrode of the first MOS tube through an eighteenth resistor; the drain electrode of the first MOS tube Q2 is connected with the 5V positive electrode of the power supply, and the source electrode of the first MOS tube Q2 is connected with the first power supply.
8. The motor temperature sensor detection circuit according to claim 7, wherein the switch control circuit includes a second switch control branch that outputs the first power supply ground GND1 and/or the second power supply ground GND2 according to information of the processor;
the input end of the second switch control branch is connected with an output switch of the processor, and the output of the second switch control branch is connected with the power ground of the first controllable voltage dividing branch or the second controllable voltage dividing branch; wherein:
the circuit for outputting the first power ground GND by the second switch control branch circuit comprises a second MOS tube Q3, a nineteenth resistor, a twentieth resistor and an eighth capacitor;
after the twentieth resistor and the eighth capacitor are connected in parallel, one end of the twentieth resistor is connected to the grid electrode of the second MOS tube Q3, and the other end of the twentieth resistor is connected to the power ground GND; one end of the nineteenth resistor is connected to the output switch of the processor, and the other end of the nineteenth resistor is connected to the grid electrode of the second MOS tube Q3;
the source electrode of the second MOS tube Q3 is connected with the power ground GND;
the drain electrode of the second MOS transistor Q3 is connected with the first power supply ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321672724.1U CN220490249U (en) | 2023-06-29 | 2023-06-29 | Motor temperature sensor detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321672724.1U CN220490249U (en) | 2023-06-29 | 2023-06-29 | Motor temperature sensor detection circuit |
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| CN220490249U true CN220490249U (en) | 2024-02-13 |
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