US 2004/0125624 A1 · Power supply system

Abstract

Two proposals are made for power supply systems comprising at least one resonant inverter and one control unit. According to the first proposal the power supply system comprises two inverters and produces two output voltages, the control circuit processing as an actual value on the one hand the sum of and on the other hand the difference between the two output voltages. According to the second proposal a control circuit does not directly process the controlled variables for a power supply system comprising at least one inverter, but difference units for controlled variables determine the deviations from a preceding sampling instant and these difference values are processed. Also the correcting variable calculated in this way is a difference value which is converted into a correcting variable value by a correcting variable summing unit. The two proposals can be advantageously combined. As an important improvement is proposed the use of a limiting controller which generally becomes active in case of imminent transgression of a maximum value and which limits the actuation. The control circuit is preferably used as a digital control circuit for a state space control.

Claims12

Dependent claims

A power supply system comprising

at least a first and a second inverter (20a, 20b) for generating a switched first and second inverter output voltage, respectively,
a resonant circuit fed by the inverters (20a, 20b), the circuit comprising at least one transformer (22) and at least one resonant capacitor (C1, C2),
at least two output voltages (Uout1, Uout2) generated on the secondary side of the transformer (22),
characterized in that
a control circuit (16) is provided which processes a first actual value (Uout,sum) that depends on the sum of the two output voltages (Uout1, Uout2)
and a second actual value that depends on the difference between the two output voltages (Uout1, Uout2),
while the control circuit (16) predefines driving magnitudes (a1, a2) as correcting variables for the inverters (20a, 20b).

4 more elements

A power supply system comprising

at least one inverter (20a, 20b) for generating a switched inverter output voltage,
a resonant circuit fed by the inverter, the circuit comprising at least one transformer (22) and at least one resonant capacitance (UC1, UC2), at least one output voltage (Uout1, Uout2) being generated on the secondary side of the transformer (22),
and a control circuit (16) for adjusting the output voltage (Uout1, Uout2) to a set value (Uref) while the control circuit (16) delivers driving values (a1, a2) for the inverters (20a, 20b) as correcting variables,
characterized in that
the control circuit (16) has at least one controlled variable difference unit (Δ) which determines a difference value between controlled variables for each processed instant of successive sampling instants, which difference value depends on the difference between the current sample value of the controlled variable and at least one preceding sample value of the controlled variable,
and the control circuit (16) first delivers a correcting variable difference value as a correcting variable,
the control circuit including a correcting variable summing unit (Σ) which unit determines a correcting variable value at a respective currently processed instant of successive instants, which correcting variable value is formed from a preceding correcting variable and the delivered correcting variable difference.

4 more elements

Dependencies are inferred from the claim text.

Power supply system

Life of this patent

Power supply system

Life of this patent

Abstract

Claims12