Multi-mode control systems for high-frequency resonant inverters
First Claim
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1. An inverter system comprising a DC input power source;
- two resonating current sources powered by said DC input power source and resonant at the same frequency;
means for combining the currents in the two current sources; and
control means, responsive to the combined currents varying from a selected value, for adjusting both the frequency of operation of both current sources and their relative phases in directions which tend to cause said combined currents to approach said selected value.
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Abstract
An inverter system having two resonating current sources which are resonant at the same frequency. The currents of the two sources are combined. At low power levels, the currents are substantially out of phase and the frequency is adjusted. At intermediate power levels, the currents are adjusted in phase and the frequency is fixed. At high power levels, the currents are substantially in phase and the frequency is adjusted.
39 Citations
26 Claims
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1. An inverter system comprising a DC input power source;
- two resonating current sources powered by said DC input power source and resonant at the same frequency;
means for combining the currents in the two current sources; and
control means, responsive to the combined currents varying from a selected value, for adjusting both the frequency of operation of both current sources and their relative phases in directions which tend to cause said combined currents to approach said selected value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 19, 20, 21, 22)
- two resonating current sources powered by said DC input power source and resonant at the same frequency;
- 16. An inverter system in accordance with claim wherein at intermediate power levels said control means causes the frequency to remain fixed and the relative phases to be adjusted.
- 23. A circuit for controlling the signal outputs of a pulse width modulator SG3524 integrated circuit to exhibit phase and frequency changes which are both functions of an input signal but which change over respective input signal voltage sub-ranges, with only one of the phase and frequency changing over each input signal sub-range, comprising an SG3524 integrated circuit having error amplifier in put means and a current control input from which current is drawn, resistor means connected to said current control input for drawing current, Zener diode means having a cathode connected to said current control input and an anode connected to said error amplifier input means, and means for coupling an in put signal to said anode.
- 25. A circuit for controlling the signal outputs of a pulse width modulator integrated circuit to exhibit phase and frequency changes which are both functions of an input signal but which change over respective input signal voltage sub-ranges, with only one of the phase and frequency changing over each input signal sub-range, comprising a pulse width modulator integrated circuit having error amplifier input means and a current control input through which current flows, resistor means connected to said current control input for allowing current to flow therethrough, non-linear circuit means having a first terminal coupled to said current control input and second terminal coupled to said error amplifier input means, and means for coupling and input signal to said non-linear circuit means.
Specification