Pendulum resonant converter and method
First Claim
1. A DC to DC resonant switching converter comprising:
- a first pair of series connected switches comprising a high side switch and a low side switch coupled across a DC input voltage, there being a first switched node between the switches;
a second pair of series connected switches comprising a high side switch and a low side switch coupled across a DC bus, there being a second switched node between the switches;
a DC bus capacitor coupled across the DC bus;
the first and second switched nodes adapted to have a load coupled therebetween;
the high side switch of said first pair of switches supplying current to the load from said DC input voltage, the low side switch of said first pair of switches being switched opposite said high side switch of said first pair of switches and providing a re-circulation path to allow bi-directional current flow through the load;
the high side switch of said second pair of switches supplying current to the load from said DC bus capacitor, the low side switch of said second pair of switches being switched opposite said high side switch of said second pair of switches and providing a re-circulation path to allow bi-directional current flow through the load;
a controller for controlling the switching of each of said switches of said first and second pairs of switches, said controller comprising a phase shift circuit providing a phase shift between the control signals driving the switches of the first and second pairs to shape the waveshape of the output voltage of the converter provided to the load;
the controller further comprising a first circuit for providing a first compensation signal for the control signals driving the first pair of switches to compensate for variation of the DC input voltage; and
a second circuit for providing a second compensation signal for the control signals driving the second pair of switches to compensate for variation of the DC bus voltage.
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Accused Products
Abstract
A resonant switching converter comprising a first pair of series connected switches comprising a high side switch and a low side switch coupled across a DC input voltage, there being a first switched node between the switches; a second pair of series connected switches comprising a high side switch and a low side switch coupled across a DC bus, there being a second switched node between the switches; a DC bus capacitor coupled across the DC bus; the first and second switched nodes adapted to have a load coupled therebetween; the high side switch of the first pair of switches supplying current to the load from the DC input voltage, the low side switch of the first pair of switches being switched opposite the high side switch of the first pair of switches and providing a re-circulation path to allow bi-directional current flow through the load; the high side switch of the second pair of switches supplying current to the load from the DC bus capacitor, the low side switch of the second pair of switches being switched opposite said high side switch of the second pair of switches and providing a re-circulation path to allow bidirectional current flow through the load; a controller for controlling the switching of each of the switches of the first and second pairs of switches, the controller comprising a phase shift circuit providing a phase shift between the control signals driving the switches of the first and second pairs of switches to shape the waveshape of the output voltage of the converter provided to the load; the controller further comprising a first circuit for providing a first compensation signal for the control signals driving the first pair of switches to compensate for variation of the DC input voltage; and a second circuit for providing a second compensation signal for the control signals driving the second pair of switches to compensate for variation of the DC bus voltage.
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Citations
35 Claims
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1. A DC to DC resonant switching converter comprising:
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a first pair of series connected switches comprising a high side switch and a low side switch coupled across a DC input voltage, there being a first switched node between the switches;
a second pair of series connected switches comprising a high side switch and a low side switch coupled across a DC bus, there being a second switched node between the switches;
a DC bus capacitor coupled across the DC bus;
the first and second switched nodes adapted to have a load coupled therebetween;
the high side switch of said first pair of switches supplying current to the load from said DC input voltage, the low side switch of said first pair of switches being switched opposite said high side switch of said first pair of switches and providing a re-circulation path to allow bi-directional current flow through the load;
the high side switch of said second pair of switches supplying current to the load from said DC bus capacitor, the low side switch of said second pair of switches being switched opposite said high side switch of said second pair of switches and providing a re-circulation path to allow bi-directional current flow through the load;
a controller for controlling the switching of each of said switches of said first and second pairs of switches, said controller comprising a phase shift circuit providing a phase shift between the control signals driving the switches of the first and second pairs to shape the waveshape of the output voltage of the converter provided to the load;
the controller further comprising a first circuit for providing a first compensation signal for the control signals driving the first pair of switches to compensate for variation of the DC input voltage; and
a second circuit for providing a second compensation signal for the control signals driving the second pair of switches to compensate for variation of the DC bus voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for operating a DC to DC resonant switching converter, wherein the switching converter comprises a first pair of series connected switches comprising a high side switch and a low side switch coupled across a DC input voltage with a first switched node between the switches;
- a second pair of series connected switches comprising a high side switch and a low side switch coupled across the DC bus with a second switched node between the switches; and
a DC bus capacitor coupled across the DC bus, a load adapted to be coupled between the first and second switched nodes adapted to have a load coupled therebetween;
the method comprising;
supplying current to the load from said DC input voltage through the high side switch of said first pair of switches;
switching the low side switch of said first pair of switches in opposite phase to said high side switch of said first pair of switches and providing a re-circulation path to allow bi-directional current flow through the load through said low side switch;
supplying current to the load from said DC bus capacitor through the high side switch of said second pair of switches;
switching the low side switch of said second pair of switches in opposite phase to said high side switch of said second pair of switches and providing a re-circulation path to allow bi-directional current flow through the load through the low side switch of the second pair of switches;
controlling the switching of each of the switches of the first and second pairs of switches by providing a phase shift between control signals driving switches of the first and second pairs of switches to shape the waveshape of the output voltage of the converter provided to the load;
further comprising providing a first compensation signal for the control signals driving the first pair of switches to compensate for variation of the DC input voltage and providing a second compensation signal for the control signals driving the second pair of switches to compensate for variation of the DC bus voltage. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
- a second pair of series connected switches comprising a high side switch and a low side switch coupled across the DC bus with a second switched node between the switches; and
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34. A circuit for determining the current through a gas discharge lamp, wherein the gas discharge lamp is coupled into a resonant circuit such that the lamp is in series with an inductor and in parallel with a resonant capacitance, the lamp having a resonant voltage applied thereacross, the lamp having a filament having a resistance, the circuit comprising an amplifier having its inputs coupled across the lamp for sensing the voltage across the lamp for only one half cycle of each cycle of the applied resonant voltage, whereby the output of the amplifier is proportional to the voltage across the filament of the lamp and thus proportional to the current in the lamp.
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35. A method for determining the current through a gas discharge lamp, wherein the gas discharge lamp is coupled into a resonant circuit such that the lamp is in series with an inductor and in parallel with a resonant capacitance, the lamp having a resonant voltage applied thereacross, the lamp having a filament having a resistance, the method comprising sensing the voltage across the lamp for only one half cycle of each cycle of the applied resonant voltage, whereby the sensed voltage is proportional to the voltage across the filament of the lamp and thus proportional to the current in the lamp.
Specification