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A signal acquisition and circuit technology, applied in the direction of using electric devices, electromagnetic means, and thermometers using electric/magnetic elements that are directly sensitive to heat, can solve the problem of affecting the performance and service life of motors and controllers, and the temperature of the measured point Inaccuracies, deviations, etc.
Inactive Publication Date: 2013-02-13
CHONGQING CHANGAN AUTOMOBILE CO LTD +1
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[0006] However, when the temperature sensor is installed, it is connected to the measured point through a lead wire, and the lead wire has resistance. When the acquisition circuit collects the voltage of the sensor, the resistance on the lead wire will be superimposed on the actual resistance of the sensor. The measured voltage value deviates from the actual voltage value, and eventually the temperature of the measured point calculated by the MCU is inaccurate, which affects the judgment of the temperature of the motor and controller, which in turn affects the performance and service life of the motor and controller
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Embodiment 1
[0042] The present application provides a signal acquisition circuit, including: a power supply VCC, a bridge circuit 101 and a voltage measurement circuit 102;
[0043] Wherein, the power supply VCC provides voltage for the signal acquisition circuit;
[0044] The bridge circuit 101 is connected to the power supply VCC for receiving the voltage provided by the power supply VCC, and a temperature sensor is arranged in a bridge arm of the bridge circuit;
[0045] The voltage measurement circuit 102 is used to measure the voltage value of the temperature sensor from the bridge circuit 101, and send the voltage value to the main control chip MCU to calculate the temperature value measured by the temperature sensor.
[0046] see figure 2 It shows a schematic diagram of a signal acquisition circuit provided in Embodiment 1 of the present application, including: a power supply VCC, a bridge circuit 101 and a voltage measurement circuit 102;
[0047] Such as figure 2 As shown, i...
Embodiment 2
[0098] see Figure 5 , showing a schematic diagram of Embodiment 2 of a signal acquisition circuit provided by the present application, in Figure 4 The circuit shown also includes: a voltage stabilizing circuit 103;
[0099] The voltage stabilizing circuit 103 is used to stabilize the voltage value output from the power supply VCC to the bridge circuit 101 at a reference voltage value.
[0100] Unstable voltage will affect the measurement and calculation of the subsequent voltage value, so the voltage stabilization circuit 103 is used to stabilize the voltage value output by the power supply VCC at the reference voltage value.
[0101] The voltage stabilizing circuit 103 includes: a power chip U2 and a variable resistor R8;
[0102] Wherein, the power chip U2 is connected in series with the voltage dividing resistor R0, and the anode 3 of the power chip U2 is connected to the junction of the voltage dividing resistor R0, the first resistor R1 and the third resistor R3, and ...
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Abstract
The invention provides a signal collecting circuit which comprises a power supply VCC (Voltage To Current Converter) and a bridge circuit, wherein the bridge circuit is connected with the power supply VCC and used for receiving a voltage provided by the power supply VCC; a first resistor and a temperature sensor are connected with each other in series to form a first bridge arm; a second resistor and a third resistor are connected with each other in series to form a second bridge arm; the first bridge arm and the second bridge arm are connected between the power supply VCC and a ground level in parallel; the temperature sensor in the first bridge arm is connected with the ground level; and resistances of the resistors, which are positioned in the first bridge arm and the second bridge arm and connected with the power supply VCC, are equal to each other. A voltage measuring circuit is respectively connected with middle ends of the two bridge arms of the bridge circuit, so as to measure the voltage value of the temperature sensor from the bridge circuit; the measured voltage values are only the voltages at two ends of the temperature sensor; the resistance of a lead wire connected between the temperature sensor and a detected point does not affect the voltage value of the temperature sensor, measured by the voltage measuring circuit, so that the calculated temperature value is accurate.
Description
technical field [0001] The present application belongs to the field of electric vehicles, and in particular relates to a signal acquisition circuit. Background technique [0002] As the research and development of electric vehicles become increasingly popular, the application of electric motors in electric vehicles is also extensive. [0003] The motor and controller dissipate heat during operation, which affects the temperature of the power module and radiator of the motor and controller. When the temperature exceeds the specified range, the work of the motor and the control system will be affected. Therefore, it is necessary to The temperature of the power module of the motor and the controller, and the heat sink is detected, and the temperature of these positions is generally detected by a temperature sensor. The resistance value of the temperature sensor changes with the change of the measured temperature, so the measured temperature can be calculated according to the r...
Claims
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Application Information
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