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US 7,426,124 B2Granted
DC-AC converter
AssigneeKEC Corporation
InventorsSeung Kon Kong, Tae Jin Kim, Nak Choon Choi
Life of this patent
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Abstract
A DC-AC converter has two half-bridge circuits using an input feedback signal and an input clock signal together with time delay circuits, wherein one of the half-bridge circuits drives one pair of corresponding FETs and the other half-bridge circuit drives the other pair of corresponding FETs. The DC-AC converter includes: a Direct Current (DC) power source; a switching unit which includes a plurality of Field Effect Transistors (FETs) for changing paths of Direct Current (DC), so as to convert the DC to Alternating Current (AC); a transformer for transforming a voltage input from the switching unit; a load unit connected to the transformer; and a signal control unit for simultaneous parallel control of the FETs in the switching unit.
Claims13
A Direct Current to Alternating Current (DC-AC) converter comprising:
- a Direct Current (DC) power source;
- a switching unit which includes a plurality of Field Effect Transistors (FETs) for changing paths of Direct Current (DC), so as to convert the DC to Alternating Current (AC);
- a transformer for transforming a voltage input from the switching unit;
- a load unit connected to the transformer;
- and
- a signal control unit for simultaneously parallel control of the FETs in the switching unit;
- wherein the FETs in the switching unit include a first P channel FET and a first N channel FET, which are interconnected in series and connected in parallel to the DC power source, and a second P channel FET and a second N channel FET, which are interconnected in series and connected in parallel to the DC power source;
- further comprising a feedback control unit connected between the switching unit and the load unit, so as to generate and output a predetermined signal by using a feedback signal from the load unit and a clock signal from an oscillator;
- wherein the signal control unit outputs four control signals by using the predetermined signal from the feedback control unit and the clock signal of the oscillator, so as to simultaneously control the first P channel FET, the first N channel FET, the second P channel FET, and the second N channel FET in parallel;
- wherein, in order to control the first P channel FET, the signal control unit comprises:
- a toggle switch to which a clock signal of the oscillator is input;
- a first AND gate to which the reference signal output from the feedback control unit and the clock signal output from the toggle switch are inputs;
- a time delay unit which delays a signal from the first AND gate for a predetermined time interval and then outputs a delayed signal;
- a first inverter for inverting a signal from the time delay unit and outputting an inverted signal;
- a second AND gate to which a signal from the first AND gate and the inverted signal from the first inverter are inputs;
- and
- a second inverter to which a signal from the second AND gate is input.
14 more elements
A Direct Current to Alternating Current (DC-AC) converter comprising:
- a Direct Current (DC) power source;
- a switching unit which includes a plurality of Field Effect Transistors (FETs) for changing paths of Direct Current (DC), so as to convert the DC to Alternating Current (AC);
- a transformer for transforming a voltage input from the switching unit;
- a load unit connected to the transformer;
- a signal control unit for simultaneously parallel control of the FETs in the switching unit;
- wherein the FETs in the switching unit include a first P channel FET and a first N channel FET, which are interconnected in series and connected in parallel to the DC power source, and a second P channel FET and a second N channel FET, which are interconnected in series and connected in parallel to the DC power source;
- further comprising a feedback control unit connected between the switching unit and the load unit, so as to generate and output a predetermined signal by using a feedback signal from the load unit and a clock signal from an oscillator;
- wherein the signal control unit outputs four control signals by using the predetermined signal from the feedback control unit and the clock signal of the oscillator, so as to simultaneously control the first P channel FET, the first N channel FET, the second P channel FET, and the second N channel FET in parallel;
- wherein, in order to control the first N channel FET, the signal control unit comprises:
- a toggle switch to which a clock signal of the oscillator is input;
- a first AND gate to which the reference signal output from the feedback control unit and the clock signal output from the toggle switch are inputs;
- a first inverter for inverting a signal from the first AND gate and outputting an inverted signal;
- a time delay unit which delays a signal from the first inverter for a predetermined time interval and then outputs a delayed signal;
- a second inverter for inverting a signal from the time delay unit and outputting an inverted signal;
- a second AND gate to which the inverted signal from the first inverter and the inverted signal from the second inverter are inputs;
- a third inverter to which a signal from the second AND gate is input;
- and
- a fourth inverter to which a signal from the third inverter is input.
15 more elements
A Direct Current to Alternating Current (DC-AC) converter comprising:
- a Direct Current (DC) power source;
- a switching unit which includes a plurality of Field Effect Transistors (FETs) for changing paths of Direct Current (DC), so as to convert the DC to Alternating Current (AC);
- a transformer for transforming a voltage input from the switch mg unit;
- a load unit connected to the transformer;
- a signal control unit for simultaneously parallel control of the FETs in the switching unit;
- wherein the FETs in the switching unit include a first P channel FET and a first N channel FET, which are interconnected in series and connected in parallel to the DC power source, and a second P channel FET and a second N channel FET, which are interconnected in series and connected in parallel to the DC power source;
- further comprising a feedback control unit connected between the switching unit and the load unit, so as to generate and output a predetermined signal by using a feedback signal from the load unit and a clock signal from an oscillator;
- wherein the signal control unit outputs four control signals by using the predetermined signal from the feedback control unit and the clock signal of the oscillator, so as to simultaneously control the first P channel FET, the first N channel FET, the second P channel FET, and the second N channel FET in parallel;
- wherein, in order to control the second P channel FET, the signal control unit comprises:
- a toggle switch to which a clock signal of the oscillator is input;
- a first inverter to which a signal output from the toggle switch is input;
- a first AND gate to which the reference signal output from the feedback control unit and a signal output from the first inverter are inputs;
- a time delay unit which delays a signal from the first AND gate for a predetermined time interval and then outputs a delayed signal;
- a second inverter for inverting a signal from the time delay unit and outputting an inverted signal;
- a second AND gate to which a signal from the first AND gate and a signal from the second inverter are inputs;
- and
- a third inverter to which a signal from the second AND gate is input.
14 more elements
A Direct Current to Alternating Current (DC-AC) converter comprising:
- a Direct Current (DC) power source;
- a switching unit which includes a plurality of Field Effect Transistors (FETs) for changing paths of Direct Current (DC), so as to convert the DC to Alternating Current (AC);
- a transformer for transforming a voltage input from the switching unit;
- a load unit connected to the transformer;
- a signal control unit for simultaneously parallel control of the FETs in the switching unit;
- wherein the FETs in the switching unit include a first P channel FET and a first N channel FET, which are interconnected in series and connected in parallel to the DC power source, and a second P channel FET and a second N channel FET, which are interconnected in series and connected in parallel to the DC power source;
- further comprising a feedback control unit connected between the switching unit and the load unit, so as to generate and output a predetermined signal by using a feedback signal from the load unit and a clock signal from an oscillator;
- wherein the signal control unit outputs four control signals by using the predetermined signal from the feedback control unit and the clock signal of the oscillator, so as to simultaneously control the first P channel FET, the first N channel FET, the second P channel FET, and the second N channel FET in parallel;
- wherein, in order to control the second N channel FET, the signal control unit comprises:
- a toggle switch to which a clock signal of the oscillator is input;
- a first inverter to which a signal output from the toggle switch is input;
- a first AND gate to which the reference signal output from the feedback control unit and a signal output from the first inverter are inputs;
- a second inverter for inverting and outputting a signal from the first AND gate;
- a time delay unit which delays a signal from the second inverter for a predetermined time interval and then outputs a delayed signal;
- a third inverter for inverting a signal from the time delay unit and outputting an inverted signal;
- a second AND gate to which a signal from the second inverter and a signal from the third inverter are inputs;
- a fourth inverter to which a signal from the second AND gate is input;
- and
- a fifth inverter to which a signal from the fourth inverter is input.
16 more elements
Dependencies are inferred from the claim text.