Drive circuit, electronic device, and method of controlling drive circuit
AssigneeSony Corporation
InventorMasahiro Sato
Life of this patent
Estimating the term…
Abstract
A drive circuit, an electronic device, and a method of controlling a drive circuit that can reduce power consumption. The drive circuit includes: a control circuit that controls application of an AC voltage to a capacitive load; an inductive element which constitutes a closed circuit along with the capacitive load; a diode , which is connected in series to the inductive element between the capacitive load and the inductive element so as to constitute the closed circuit; and a switch element, which is connected in series to the diode between the capacitive load and the inductive element so as to constitute the closed circuit.
Claims16
A drive circuit comprising:
- a first control circuit that controls application of an AC voltage to a first capacitive load;
- an inductive element that constitutes a first closed circuit together with the first capacitive load;
- a first diode-type element that is connected in series with the inductive element between the first capacitive load and the inductive element so as to constitute the first closed circuit;
- a first switch element that is connected in series with the first diode-type element between the first capacitive load and the inductive element so as to constitute the first closed circuit;
- a first reverse bias diode-type element which is connected between a first supply end for a first DC potential and a point between the first capacitive load and the inductive element, and to which a reverse bias is applied by the first DC potential;
- and
- a second reverse bias diode-type element which is connected between a second supply end for a second DC potential and a point between the first capacitive load and the inductive element, and to which a reverse bias is applied by the second DC potential.
A method of controlling a drive circuit, the method comprising:
- in a first closed circuit constituted by an inductive element connected in series with a first capacitive load, a first diode-type element connected in series with the inductive element between the first capacitive load and the inductive element, and a first switch element connected in series with the first diode-type element between the first capacitive load and the inductive element, shifting the first switch element from an off state to an on state;
- inverting, via the first closed circuit, a polarity of a voltage applied to the first capacitive load;
- shifting the first switch element from the on state to the off state;
- and
- applying, from the first control circuit, an AC voltage of a same polarity as the voltage applied to the first capacitive load, wherein
- the first control circuit applies the AC voltage to the first capacitive load with a voltage level of the AC voltage set to a lower voltage level a first time than a voltage level second and subsequent times.
Dependencies are inferred from the claim text.