Method for regulating mechanical potentiometer in digital potentiometer voltage-regulation circuit
A digital potentiometer and voltage regulating circuit technology, which is applied in the adjustment field of mechanical potentiometers in digital potentiometer voltage regulating circuits, can solve the problems of slow adjustment speed of mechanical potentiometers, and achieve the effect of fast adjustment and improved adjustment speed
Active Publication Date: 2013-11-13
BEIJING MECHANICAL EQUIP INST
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[0004] The purpose of the present invention is to provide a method for adjusting the mechanical potentiometer in the digital potentiometer voltage regulating circuit to solve the problem of slow adjustment speed of the mechanical potentiometer in the current digital potentiometer voltage regulating circuit
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[0026] This method is aimed at the adjustment method of the mechanical potentiometer in the voltage regulating circuit of the digital potentiometer, and the voltage regulating circuit of the digital potentiometer includes: resistance R1, resistance R2, resistance R3, resistance R4, capacitance C1, capacitance C2, operational amplifier 1 , Digital potentiometer 4, mechanical potentiometer A2, mechanical potentiometer B3.
[0027] One end of the resistor R1 is grounded to GND, and the other end is connected to the resistor R2 and one end of the mechanical potentiometer B3; the other end of the resistor R2 and the mechanical potentiometer B3 is connected to the IN+ pin of the operational amplifier 1. The IN- pin of the operational amplifier 1 is connected to the voltage reference terminal outside the circuit, and the GND pin of the operational amplifier 1 is grounded to GND. The VCC pin of the operational amplifier 1 and one end of the capacitor C1 are connected to the power supp...
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The invention discloses a method for regulating a mechanical potentiometer in a digital potentiometer voltage-regulation circuit. The method comprises the following specific steps of: when a digital potentiometer (4) receives 0*00, regulating a mechanical potentiometer A (2) to make the output voltage of a circuit reach a lower limit value of a voltage regulation target; when the digital potentiometer (4) receives 0*ff, calculating a voltage target value corresponding to the 0*ff by utilizing a current voltage output value and the upper limit value of the voltage regulation target, and regulating a mechanical potentiometer B (3) to make the output voltage of the circuit reach the voltage target value corresponding to the 0*ff; and regulating the mechanical potentiometer A (2) and the mechanical potentiometer B (3) for a plurality of times until the voltage regulation range of the circuit is consistent with a required target. By the method, the mechanical potentiometer in the digital potentiometer voltage-regulation circuit can be regulated rapidly; and compared with the conventional regulating method which requires dozens of regulating times, the invention has the advantage that: the regulating times is less than five; and the regulating speed is greatly increased.
Description
technical field [0001] The invention relates to a method for adjusting a mechanical potentiometer, in particular to a method for adjusting a mechanical potentiometer in a voltage regulating circuit of a digital potentiometer. Background technique [0002] In recent years, voltage regulating circuits based on digital potentiometers have been widely used in power supplies and other equipment. In order to compensate for the individual differences of digital potentiometers, the circuit often needs two mechanical potentiometers as a match to achieve the purpose of high-precision voltage regulation. The digital potentiometer receives the hexadecimal 0x00~0xff data sent by the external microprocessor, thereby changing the output resistance, and then achieving the effect of adjusting the output voltage of the circuit. In order to make the voltage regulation range highly consistent with the actual demand, it is realized by adjusting two mechanical potentiometers. [0003] The tradi...
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IPC IPC(8): G05F1/12
Inventor 孟祥适徐雪峰赵哲李蓉
Owner BEIJING MECHANICAL EQUIP INST