Transformer-rectifier with ripple filter

• US 4,903,186 A
• Filed: 05/22/1989
• Issued: 02/20/1990
• Est. Priority Date: 05/22/1989
• Status: Expired due to Fees

• Current Assignee: Keats A. Pullen Jr
• Original Assignee: Keats A. Pullen Jr
• Inventors: Pullen, Keats A. Jr.
• Primary Examiner(s): BEHA JR, WILLIAM
• Application Number:
  US07/355,580
• Time in Patent Office: 274 Days
• Field of Search: 363/2-4, 363/44, 363/45, 363/47, 363/48, 363/61, 363/126
• US Class Current: 363/45
• CPC Class Codes: H02M 1/14 Arrangements for reducing ripples from dc input or output
• CPC Class Codes: H02M 7/068 mounted on a transformer

Abstract

A power supply having a low ripple component to minimize waste power and improve efficiency. In a full wave power supply, additional circuitry is provided for decreasing the time between charging episodes of the output capacitor. The circuitry is comprised of additional capacitors and diodes, and is connected between taps on the transformer and the output capacitor.

Claims

1. A power supply which results in a low output voltage ripple, comprising,

a transformer which is center-tapped and has one intermediate tap within each transformer half,

rectifier means connected to the output of the transformer, said rectifier means including at least one diode and an output capacitor, and

circuit means connected between the intermediate taps and the output capacitor for increasing the frequency at which the output capacitor is charged.

2. A power supply which results in a low output voltage ripple, comprising,

a transformer,

full wave rectifier means connected to the output of the transformer which includes at least two diodes and an output capacitor, wherein the transformer is center-tapped and has one intermediate tap within each transformer half,

circuit means connected between said intermediate taps and said output capacitor for increasing the frequency at which the output capacitor is charged.

3. The power supply of claim 2 wherein said circuit means connected between each intermediate tap and the output capacitor includes a second capacitor.

4. The power supply of claim 3 wherein said circuit means connected between each intermediate tap and the output capacitor includes at least one diode.

5. The power supply of claim 4 wherein each second capacitor is connected between one of said intermediate taps and the connection point between first and second diodes, said first diode being connected between said second capacitor and one side of said output capacitor and the second diode being connected with opposing polarity to said first diode between said second capacitor and the other side of said output capacitor.

6. The power supply of claim 2 wherein the location of said intermediate taps is adjusted to provide optimum recharge pattern.

7. The power supply of claim 5 wherein the location of said intermediate taps is adjusted to provide optimum recharge pattern.