| 摘要 |
<p>PURPOSE:To realize the miniaturization, light weight and integration in a simple way and at the same time to reduce the power consumption, by constituting a current detecting circuit with a resistor, an amplifier, a transformer, a switch element, a rectifier and an LPF respectively. CONSTITUTION:A current detecting circuit consists of a resistor 300, an amplifier 301, a transformer 306, a switch element 303, a rectifying circuit 307 and an LPF308. An end of the resistor 300 is connected to a winding 202 with the other end connected to a terminal 209. An end of the switch element 303 is connected to the output of the amplifier 301 having the input connected to the other end of the resistor 300, and performs the switching control by the output of an oscillator 302. The transformer 306 consists of the 1st and 2nd windings 304 and 305 having an end connected to the other end of the element 303 and the other end connected to an end of the winding 202 respectively. The circuit 307 connects an input to the winding 305 of the transformer 306. The LPF306 connects the input and the output to the output of the circuit 307 and the terminal 210 respectively. In such a way, the miniaturization, light weight and integration can be facilitated for a subscriber circuit with a reduction of the power consumption.</p> |
