Field effect transistor controlled AC/DC power conversion circuit

• US 6,373,733 B1
• Filed: 09/01/2000
• Issued: 04/16/2002
• Est. Priority Date: 12/02/1999
• Status: Active Grant

• Current Assignee: Johnny Chen
• Original Assignee: Jeng-Shyong Wu, Ming-Tang Lee
• Inventors: Wu, Jeng-Shyong, Lee, Ming-Tang
• Primary Examiner(s): STERRETT, JEFFREY L
• Application Number:
  US09/654,048
• Time in Patent Office: 592 Days
• Field of Search: 363/89, 363/146
• US Class Current: 363/89
• CPC Class Codes: B60R 2022/4816 for sensing locking of buckle
• CPC Class Codes: B60R 2022/4858 for sensing pressure on seat
• CPC Class Codes: B60R 22/48 Control systems, alarms, or interlock systems, for the correct application of the belt or harness

Abstract

Disclosed herein is a FET controlled AC/DC power conversion circuit and application of same. The entire conversion circuit is constituted by a rectifier circuit, a switching circuit consisting of a FET, a controlling circuit, a monitor circuit, and a voltage stabilizing circuit, wherein output voltages of the rectifier circuit is respectively sent to the switching circuit and the controlling circuit, where switching time of the switching circuit is controlled by the controlling circuit thereby achieving control of output voltage to a load or loads.

Claims

1. A FET controlled AC/DC power conversion device powering a plurality of light emitting elements comprising:

a) a power conversion circuit adapted to be connected with an alternating current (AC) power source, the power conversion circuit including a rectifier circuit including a plurality of diodes to convert the AC from the power source into direct current (DC), a switching circuit connected to the rectifier circuit and including a plurality of resistances, a first field effect transistor (FET) and a diode to monitor an output voltage from the switching circuit, a monitor circuit connected to an output of the switching circuit and including a plurality of resistances, and a controlling circuit connected to the monitor circuit, the switching circuit and an output of the rectifier circuit, the controlling circuit including a plurality of resistances and a second field effect transistor, whereby the controlling circuit closes the switching circuit when an output voltage of the switching circuit is below a predetermined value and opens the switching circuit when the output voltage from the switching circuit exceeds the predetermined value; and

b) a load comprising the plurality of light emitting elements directly connected to the power conversion circuit whereby the power conversion circuit supplies high frequency pulsating direct current (DC) to the plurality of light emitting elements.

2. The FET controlled AC/DC power conversion device of claim 1 further comprising a threaded lamp socket having the plurality of light emitting elements, wherein the power conversion circuit is located within the socket.

3. The FET controlled AC/DC power conversion device of claim 1 further comprising an electrical plug wherein the power conversion circuit is located in the electrical plug.

4. The FET controlled AC/DC power conversion device of claim 1 wherein the plurality of light emitting elements comprises a plurality of light emissive diodes (LED).