Abstract: In a belt-type continuously variable transmission having a speed-change mechanism, a step motor arrangement including a pulley follower engaged with a movable sheave of the primary pulley, a speed-change control valve for controlling a primary pressure to be supplied to the primary pulley, a servo link, and a step motor for driving, by way of the servo link, the speed-change control valve in response to a speed-change command signal, the servo link being connected to the pulley follower to follow a variation in a width of a groove of the primary pulley, wherein the pulley follower, the speed-change control valve and the step motor are arranged side by side in the horizontal direction, and wherein the servo link extends generally horizontally from the pulley follower to interconnect the pulley follower, the speed-change control valve and the step motor.

Abstract: A DC constant voltage circuit comprises a rectifier and a boosting chopper circuit controlled by a general purpose PWM control IC. The general purpose PWM control IC receives a reference voltage Vref which regulates the output voltage by pulse width modulation and produces a voltage having the same waveform and phase as the input current to improve the power factor of the output voltage. An AC constant voltage circuit comprises a common line connecting an AC input terminal and an output terminal, positive and negative boosting chopper circuits for boosting and chopping a half-wave rectified respectively in both positive and negative sides into a DC voltage and a DC-AC inverter for inverting the DC voltage into the AC output voltage. The positive and negative boosting chopper circuits are used as a filter for improving the power factor and adjusting the waveform and phase of the output voltage to be the same as the sine full waveform of the input voltage.