Patent ID: 6735968
Filing Date: 2004-05-18
Classification: F25B,H02M,Y02B

Abstract:
A refrigerating apparatus having a refrigerating cycle provided with a compressor, the compressor being driven by an electric motor, an operating frequency of which is variably controlled, the refrigerating apparatus comprising:a first substrate, on which an active converter using an active element to convert an alternating voltage from an alternating current power source into a direct current, and an inverter, by which the generated direct current is converted into an alternating current to drive the electric motor are mounted, said first substrate having a radiation fin fixed closely to a reverse surface to a mounting surface thereof; a second substrate, on which a microcomputer for controlling the active converter and the inverter, a current detecting mechanism for detecting an electric current of the electric motor, and a terminal block of the electric motor are mounted; a casing covering sides of the first and second substrates and having a front surface provided with a step permitting the terminal block to be arranged thereon; and a third substrate, on which an interface connector, into which signals from detection sensors for various temperatures and pressures in the refrigerating cycle are input, and a photo-coupler for transmitting the input signals to the microcomputer by means of optical signals are mounted; and wherein the terminal block is adapted to the step, the first substrate, the second substrate, and the third substrate are layered in this order on a bottom surface of the casing, gel is filled up to a power semiconductor surface of the first substrate, and a resin is filled up to an upper surface of the second substrate from the gel surface.