Regulated high frequency power supply

• US 4,729,088 A
• Filed: 05/11/1987
• Issued: 03/01/1988
• Est. Priority Date: 05/11/1987
• Status: Expired due to Fees

• Current Assignee: Advance Transformer Company (Koninklijke Philips N.V.)
• Original Assignee: Advance Transformer Company (Koninklijke Philips N.V.)
• Inventors: Wong, John M.
• Primary Examiner(s): Salce, Patrick R.
• Assistant Examiner(s): VOELTZ, EMANUEL T
• Application Number:
  US07/057,394
• Time in Patent Office: 295 Days
• Field of Search: 363/24-26, 363/124, 323/224, 323/266
• US Class Current: 363/124
• CPC Class Codes: H02M 7/5381 Parallel type

Abstract

A power supplier for providing a regulated high-frequency AC output with a bucking and boosting section and a push-pull output section in which a common switching element is used in both the bucking and boosting section and in the push-pull output section.

Claims

1. A power supply including an inductance and a capacitance connected in series circuit to receive current from a source thereof;

a junction in said series circuit between said inductance and said capacitance;

first switch means which can be turned on to enable current to flow from said source through said inductance and capacitance;

second switch means which can be turned on to provide for the flow of current from said source in a path in parallel with said capacitance;

control means causing said first and second switch means to be on simultaneously for predetermined periods;

a transformer primary with a first and second end and a center tap, said center tap being connected to said junction;

third switching means connected to provide a path for current flow from said first end of said primary when turned on;

said second switching means providing a path for current flow from said second end of said primary when turned on; and

said control means turning said second and third switching means on alternately.

2. A power supply as claimed in claim 1, wherein the inductance and capacitance each have first and second terminals and wherein a diode with a predetermined polarity is connected between the second terminal of the inductance and said junction point and the first terminal of said capacitance is connected to said junction point and wherein a second diode of the same predetermined polarity is connected between the second terminal of said capacitance and the first terminal of said inductance.

3. A power supply as claimed in claim 2, wherein a diode is connected in said path of current flow in parallel with said capacitance whereby current can flow in only one direction through said second switch means.

4. A power supply as claimed in claim 3, wherein a diode is connected in said path for current flow from said second end of said primary whereby current can flow in only one direction from said second end through said second switch means.

5. A power supply as in claim 4, wherein said control means turns said first and second switch means off simultaneously whereby said power supply operates in a bucking mode.

6. A power supply as in claim 4, wherein said control means leaves said first switch means on while turning off said second switch means whereby said power supply operates in a boosting mode.

7. A power supply as in claim 4, wherein said control means is connected to said junction and operates in response to voltage at said junction to control the duty cycle of said first switch means.

8. A power supply as in claim 7, wherein a choke is connected between said junction and said center tap.