Power supply circuit having switched capacitor units
First Claim
1. A power supply circuit comprising:
- a main power supply unit comprising a voltage input, at least one main switching element, and at least one reactive element, wherein said switching element is controllable to deliver at least one of an output voltage and an output current; and
an output unit connected to said main power supply unit, the output unit comprising;
a load output,a load switching element connected in series to said load output and configured to operatively connect said load output to said main power supply unit,a first switched capacitor unit connectable to said load output and comprising a first capacitor and a first capacitor switching element configured to selectively connect the first capacitor in parallel with said load output and said load switching element, anda second switched capacitor unit connectable to said load output and comprising a second capacitor and a second capacitor switching element configured to selectively connect the second capacitor in parallel with said load output and said load switching element; and
a control unit configured to select one of the first and second switched capacitor units, and to control the load switching element synchronously with one of the first capacitor switching element and the second capacitor switching element of the selected one of the first and second switched capacitor units to connect the corresponding one of the first capacitor and the second capacitor in parallel with said load output and said load switching element.
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Accused Products
Abstract
The invention relates to a power supply circuit (10) and methods for supplying electrical power to at least one load output. The circuit comprises a main power supply unit (12) with a voltage input (14), a main switching element (26) and a reactive element (28). The switching element (26) is controllable to deliver an output voltage or current (I out). Output units (20a, 20b, 20c) with load outputs are connected to a main power supply unit (12). In order to drive loads connected to the load outputs, e.g. LEDs, OLEDs or laser diodes, with exact pulses, each output unit (20a, 20b, 20c) has a load switching element (38) to connect or disconnect the main power supply unit (12) to or from the load output. There are further provided switched capacitor units (34), each with a capacitor (C) and a capacitor switching element (40). The capacitor units may be operated such that the capacitors remain essentially charged at different voltage levels. According to a second aspect of the invention, each output unit (20a, 20b, 20c) has a switched capacitor unit (34) with a capacitor (C) and a capacitor switching element (40) connected to the load output. The load switching element (38) and the capacitor switching elements (40) are controlled synchronously.
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Citations
8 Claims
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1. A power supply circuit comprising:
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a main power supply unit comprising a voltage input, at least one main switching element, and at least one reactive element, wherein said switching element is controllable to deliver at least one of an output voltage and an output current; and an output unit connected to said main power supply unit, the output unit comprising; a load output, a load switching element connected in series to said load output and configured to operatively connect said load output to said main power supply unit, a first switched capacitor unit connectable to said load output and comprising a first capacitor and a first capacitor switching element configured to selectively connect the first capacitor in parallel with said load output and said load switching element, and a second switched capacitor unit connectable to said load output and comprising a second capacitor and a second capacitor switching element configured to selectively connect the second capacitor in parallel with said load output and said load switching element; and a control unit configured to select one of the first and second switched capacitor units, and to control the load switching element synchronously with one of the first capacitor switching element and the second capacitor switching element of the selected one of the first and second switched capacitor units to connect the corresponding one of the first capacitor and the second capacitor in parallel with said load output and said load switching element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification