Testing circuit and testing method for temperature compensating resistor
A technology of temperature compensation and resistance measurement, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve the problems of cost, more test time and cost, etc., and achieve the effect of simple test and improved accuracy
Inactive Publication Date: 2012-10-31
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
However, this method needs to constantly replace the temperature compensation resistor Rh in the test process to determine its precise resistance value, which requires more test time and cost
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[0014] see figure 2 , the preferred embodiment of the present invention provides a temperature compensation resistance measurement circuit 100, which is used to measure the ideal resistance value of the temperature compensation resistance of a voltage output circuit, so as to improve the accuracy of the output voltage of the voltage output circuit. In this example, to determine figure 1 The ideal resistance value of the temperature compensation resistance Rh of the CPU power supply circuit 200 is shown as an example to illustrate the temperature compensation resistance measurement circuit 100 .
[0015] The temperature compensation resistance measuring circuit 100 includes an analog-to-digital converter 10 , a control module 20 , a switch 22 , a digital potentiometer 30 and a display module 40 . The switch 22 , the analog-to-digital converter 10 , the digital potentiometer 30 , and the display module 40 are all electrically connected to the control module 20 , and the digita...
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The invention provides a testing circuit for a temperature compensating resistor. The testing circuit is used for testing resistance value of the temperature compensating resistor needed by a voltage output circuit. The voltage output circuit comprises a voltage output end. The testing circuit comprises an analog to digital converter, a control module, and a digital potentiometer. The analog to digital converter is controlled by the control module to read voltage at the voltage output end for multiple times. The read voltage is converted into digital signals transmitted to the control circuit by the analog to digital converter. If voltage deviation of the read voltage continuously exceeds a preset range twice, a resistance value adjusting signal is transmitted from the control module to the digital potentiometer which is electrically connected with the voltage output circuit. Self-voltage value of the digital potentiometer is adjusted according to the resistance value adjusting signal until the voltage deviation does not exceed the preset range for a preset time period. The invention further provides a testing method for the temperature compensating resistor. The testing method is simple, and precision of the output voltage is improved.
Description
technical field [0001] The invention relates to a resistance measuring circuit, in particular to a temperature compensation resistance measuring circuit and method. Background technique [0002] In the voltage output circuit, a temperature compensation resistor is often used to compensate the error caused by the temperature of the sensitive element with a large drift in the surrounding temperature value, thereby stabilizing the voltage at the voltage output terminal and improving the accuracy of the output voltage. see figure 1 , an existing CPU power supply circuit 200, including a pulse width modulation (Pulse Width Modulation, PWM) controller 210, a thermistor RNTC, an inductor LO, a DC resistance DCR, a first resistor R, a capacitor C and an output terminal VOUT. The thermistor RNTC is connected between the voltage detection terminal T of PWM210 and the ground. The inductor LO and the DC resistor DCR are connected in series between the PWM210 and the output terminal VO...
Claims
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IPC IPC(8): G01R27/02
CPCG01R27/08G01R17/06
Inventor 付迎宾
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD