Planar transformer power supply

• US 7,502,234 B2
• Filed: 07/12/2006
• Issued: 03/10/2009
• Est. Priority Date: 07/12/2006
• Status: Active Grant

• Current Assignee: Apyx Medical Corporation
• Original Assignee: Aaron Medical Industries, Inc. (Apyx Medical Corporation)
• Inventors: Goliszek, Gregory, Shilev, Nickolay Dimitrov
• Primary Examiner(s): Patel; Rajnikant B
• Application Number:
  US11/485,147
• Publication Number:
  US 20080013350A1
• Time in Patent Office: 972 Days
• Field of Search: 363 16- 20, 363/21.04, 363/21.06, 363 24- 25, 363/97, 363/98, 363/132, 336/200, 336/206, 336/223, 336/229, 336/232, 600/34, 600 37- 41
• US Class Current: 363/17
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2018/1286 having a specific transformer
• CPC Class Codes: H01F 2019/085 Transformer for galvanic isolation
• CPC Class Codes: H01F 2027/2819 Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
• CPC Class Codes: H01F 27/341 Preventing or reducing no-load losses or reactive currents
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 27/42 Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H
• CPC Class Codes: H01F 29/02 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
• CPC Class Codes: H02M 5/12 for conversion of voltage or current amplitude only

Abstract

A planar transformer power supply for an electrosurgical device to minimize stray capacitance comprising a step down/step-up isolation transformer and circuitry to limit the effects of a short circuit in the output of the planar transformer power supply on the input to the planar transformer power supply to enhance power capacity at a low load impedance as low as from about 5 ohms to about 10 ohms and to operate at resonance at the output of the planar transformer power supply.

Claims

1. A planar transformer power supply for an electrosurgical device to minimize stray capacitance comprising an isolation transformer and circuitry to limit the effects of a short circuit in the output of said planar transformer power supply to enhance power capacity at a low load impedance including a planar, bifilar push-pull/step-down, step-up resonant transformer comprising an input section and an output section, said input section comprises a primary step-down winding coupled to primary input and output terminals and said output section comprises a secondary step-up winding coupled across secondary input and output terminals, a transformer core section is disposed in operative relationship relative to said primary step-down winding and said secondary step-up winding, said primary step-down winding and the secondary step-up winding are tapped, said transformer core section comprises a first core and a second core disposed in operative relationship relative to said primary step-down winding and said secondary step-up winding and inductively coupled to each other by windings to cooperatively form a step-down transformer segment and a step-up transformer segment on the output side of said transformer core section, said secondary input terminal is coupled to a return electrode through a pair of parallel capacitors, said secondary output terminal is coupled through capacitors to a first or primary active electrode, said secondary tap is coupled to a second or secondary active electrode through a capacitor and said secondary output terminal is coupled to said secondary input terminal through a capacitor to reduce stray capacitance.