Claims
- 1. A power amplifier circuit for receiving both electrical power in the form of direct-current and a frequency signal in the form of time-sequenced mirror-image square waves having a 50 percent duty cycle, and providing an essentially pure sinusoidal output voltage and current signal to an electrical load having resistive qualities, said power amplifier circuit comprising:
- a pair of power-switching switches; and
- a transformer having a center-tapped primary winding, each of said pair of power-switching switches connecting to a respective opposite side of the primary winding of said transformer and receiving one of said time-sequenced mirror-image square waves of said frequency signal, in response to said frequency signal said power-switching switches switching said direct-current power through respective opposite sides of the primary winding of said center-tapped transformer;
- a trap circuit connecting to the secondary winding of said center-tapped transformer and blocking at least the first odd-numbered harmonic frequency multiple of said frequency signal;
- a series tuner circuit receiving electrical power from said trap circuit and allowing essentially unrestricted passage of a frequency matching said frequency signal;
- a high-order shunt tuner circuit receiving electrical power from said series tuner circuit and shunting higher-ordered multiples of the frequency of said frequency signal.
- 2. The power amplifier circuit of claim 1 further including an isolation transformer having a primary winding receiving electrical power from said high-order shunt tuner circuit and a secondary winding providing electrical power to said electrical load, said primary winding having an effective impedance equal to a resistance value of said electrical load multiplied by the square of the turns ratio across said isolation transformer, and another series tuner circuit connecting to a side of said primary winding opposite to said series tuner circuit and allowing essentially unrestricted passage of a frequency matching said frequency signal; whereby the effective impedance value of said isolation transformer primary winding prevents aggregation of said series tuner and said another series tuner into a series tuner having a characteristic frequency other than the frequency of said frequency signal.
RELATED CASES
This application is a divisional of co-pending U.S. application Ser. No. 08/268,217, still pending filed on Jun. 29, 1994.
Foreign Referenced Citations (1)
Number |
Date |
Country |
405090847 |
Apr 1993 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
268217 |
Jun 1994 |
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