| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an A/D converter of feedback pulse width modulation system which allows for simultaneous sampling in measuring devices including a multipoint balance, while achieving cost reduction by reducing the number of components even in an A/D converter of feedback pulse width modulation system.SOLUTION: An A/D converter of feedback pulse width modulation system includes a first resistor, a second resistor, a third resistor, an integrator, and a voltage detector. The first resistor has one end connected with the input terminal of its own device, and the other end connected with one end of the second resistor, one end of the third resistor and one iput terminal of the integrator. A pulse signal is connected with the other end of the second resistor, and the integrator has the other input terminal connected with a reference voltage and the output terminal connected with the input terminal of the voltage detector. The voltage detector has an output terminal connected with the output terminal of its own device and the other end of the third resistor, and outputs a voltage of low level when the input voltage is equal to or lower than a predetermined voltage level, otherwise outputs a voltage of high level.</p> |
