发明名称 |
Radio-frequency oscillation circuit |
摘要 |
A starter is provided for a self-oscillating radio frequency oscillation circuit for high-power applications used for plasma generation in an ICP emission spectrometer or for other purposes. A secondary winding of a starting transformer is arranged in an LC resonance circuit including an induction coil, capacitor and other elements. A starter, e.g. a Clapp oscillator circuit, is connected to a primary winding magnetically coupled with the secondary winding. A radio-frequency current is induced in the LC resonance circuit by energizing the starter for a certain period of time in a starting phase. As a result, electric current flows through the secondary windings in a full-bridge drive circuit which are magnetically coupled with primary windings, whereby voltage is developed between the gate and source of MOSFETs, causing these MOSFETs to begin an ON/OFF operation, whereby the self-oscillation is started. |
申请公布号 |
US9232627(B2) |
申请公布日期 |
2016.01.05 |
申请号 |
US201514633336 |
申请日期 |
2015.02.27 |
申请人 |
SHIMADZU CORPORATION |
发明人 |
Habu Toshiya |
分类号 |
H05H1/46;H03B5/12;H03B5/06;H03L3/00;H05H1/24;H05H1/30;H05H1/36 |
主分类号 |
H05H1/46 |
代理机构 |
Sughrue Mion, PLLC |
代理人 |
Sughrue Mion, PLLC |
主权项 |
1. A self-oscillating radio-frequency oscillation circuit, comprising: a DC voltage source; an LC resonance circuit including a coil and a capacitor; a switching circuit including a switching element for switching a DC power supplied from the DC voltage source and for supplying the power to the LC resonance circuit; and a transformer formed by a primary winding included in the LC resonance circuit and a secondary winding connected to a control terminal of the switching element so as to turn on and off this switching element, the radio-frequency oscillation circuit further comprising:
a) a starting transformer having a secondary winding connected inside the LC resonance circuit; and b) a starter for supplying a primary winding of the starting transformer with a radio-frequency current whose frequency is close to a resonant frequency of the LC resonance circuit during a certain period of time in a starting phase, so as to start a self-oscillation in the radio-frequency oscillation circuit. |
地址 |
Kyoto JP |