TWO TERMINALS QUASI RESONANT TANK CIRCUIT

• US 20100067276A1
• Filed: 11/17/2009
• Published: 03/18/2010
• Est. Priority Date: 02/14/2006
• Status: Active Grant

• Current Assignee: MyPAQ Holdings Ltd. (Transpacific IP Group Limited)
• Original Assignee: Flextronics America LLC (Flextronics International Limited)
• Inventors: Jansen, Arian, Sharifipour, Bahman, Telefus, Mark
• Granted Patent: US 7,924,578 B2
• Time in Patent Office: Days
• US Class Current: 363/131
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A power converter includes a transformer, a primary switch, an auxiliary switch, first and second resonance capacitors, and a secondary side rectification means. A switch mode power supply is formed to use reflected voltage and parasitic capacitance as an energy source for a transformer resonance. The auxiliary switch effectively exchanges energy between the primary inductance of the transformer and the first and second resonant capacitors. The auxiliary switch effectively switches the transformer resonance between two distinct frequencies. In one embodiment of the invention, the power converter can be, but is not limited to, a flyback converter and further includes a comparator and a driver. The comparator is for detecting the voltage across the second resonance capacitor and the driver is configured to drive the auxiliary switch based on the output state of the comparator. The resonant nature of the converter provides zero voltage (ZVS) for the primary switch as well as for the auxiliary switch.

Claims

1-61. -61. (canceled)

62. A circuit for the storage and retrieval of energy, the circuit comprising:

a transformer having primary and secondary turns; and

a resonant tank comprising;

a bidirectional switch;

a current bias gate drive for the bidirectional switch; and

first and second terminal nodes;

wherein the resonant tank is coupled to the transformer at the first terminal node and the second terminal node.

63. The circuit of claim 62, wherein one of the primary and secondary turns serve as an inductor for the resonant tank.

64. The circuit of claim 62, wherein the gate drive is implemented by using a set of components comprising:

first, second, and third diodes; and

first and second capacitors coupled to the first second and third diodes.

65. The circuit of claim 62, the transformer comprising a power transformer in a switch mode voltage converter wherein the resonant tank is coupled to the primary side of the power transformer.

66. The circuit of claim 62, the transformer comprising a power transformer in a switch mode voltage converter, wherein the resonant tank is coupled to the secondary side of the power transformer.

67. The circuit of claim 62, wherein the circuit is configured to transfer stored energy to the secondary side of the transformer.

68. The circuit of claim 62, wherein the resonant tank is a self switching adaptive circuit, which does not require external control.

69. The circuit of claim 62, wherein the resonant tank is a self switching adaptive circuit, which does not require an external driver.