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US 5,274,540 AGranted
Inverter device for stable, high power-factor input current supply
AssigneeMatsushita Electric Works, Ltd.
InventorMinoru Maehara
Life of this patent
Estimating the term…
Abstract
An inverter device for supplying a stable, high power-factor input current while restraining higher harmonics to be low is provided by a simple circuit structure in which a pulsating DC voltage supplied through a power circuit is provided to a smoothing condenser, a direct current is provided from the smoothing condenser to an inverter circuit section, and an input current path is formed from the power circuit through an impedance element to a switching element of the inverter circuit section and to part of an oscillation circuit.
Claims36
An inverter device for a stable, high power-factor current supply, the inverter device comprising:
- a rectifier receiving a source voltage from an AC power source and providing at an output a pulsating DC voltage,
- smoothing means receiving said pulsating DC voltage from said rectifier and providing at an output a smoothed DC voltage, said smoothing means including a condenser,
- an inverter circuit section connected in parallel with said smoothing means and including switching means receiving said smoothed DC voltage from the smoothing means including a chopper circuit and an oscillation circuit for generating a high frequency voltage in response to ON and OFF operation of said switching means,
- an impedance element coupling said inverter circuit section to at least one of said AC power source and said rectifier and forming a current path for an input current to directly flow from said AC power source through said impedance element and the switching means to said oscillation circuit,
- a DC blocking condenser connected in series with said oscillation circuit for blocking a DC component, and
- means for controlling a voltage across the DC blocking condenser.
3 more elements
An inverter device for a stable, high power-factor current supply, the inverter device comprising:
- a rectifier receiving a source voltage from an AC power source and providing at an output a pulsating DC voltage,
- smoothing means receiving said pulsating DC voltage from said rectifier and providing at an output a smoothed DC voltage, said smoothing means including a condenser,
- an inverter circuit section connected in parallel with said smoothing means and including switching means receiving said smoothed DC voltage from the smoothing means including a chopper circuit and an oscillation circuit for generating a high frequency voltage in response to ON and OFF operation of said switching means,
- an impedance element coupling said inverter circuit section to at least one of said AC power source and said rectifier and forming a current path for an input current to directly flow from said AC power source through said impedance element and the switching means to said oscillation circuit,
- a condenser connected in series with said oscillation circuit for blocking a DC component, and
- means for controlling a voltage at the impedance element.
3 more elements
An inverter device for a stable, high power-factor current supply, the inverter device comprising:
- a rectifier receiving a source voltage from an AC power source and providing at an output a pulsating DC voltage,
- smoothing means receiving said pulsating DC voltage from said rectifier and providing at an output a smoothed DC voltage, said smoothing means including a condenser,
- an inverter circuit section connected in parallel with said smoothing means and including switching means receiving said smoothed DC voltage from the smoothing means including a chopper circuit and an oscillation circuit for generating a high frequency voltage in response to ON and OFF operation of said switching means,
- an impedance element coupling said inverter circuit section to said rectifier and forming a current path for an input current to flow from said AC power source through said impedance element and the switching means to said oscillation circuit,
- a DC blocking condenser connected in series with said oscillation circuit for blocking a DC component, and
- means for controlling a voltage across the DC blocking condenser.
3 more elements
An inverter device for a stable, high power-factor current supply, the inverter device comprising:
- a rectifier receiving a source voltage from an AC power source and providing at an output a pulsating DC voltage,
- smoothing means receiving said pulsating DC voltage from said rectifier and providing at an output a smoothed DC voltage, said smoothing means including a condenser,
- an inverter circuit section connected in parallel with said smoothing means and including switching means receiving said smoothed DC voltage from the smoothing means including a chopper circuit and an oscillation circuit for generating a high frequency voltage in response to ON and OFF operation of said switching means,
- an impedance element coupling said inverter circuit section to said rectifier and forming a current path for an input current to flow from said AC power source through said impedance element and the switching means to said oscillation circuit,
- a condenser connected in series with said oscillation circuit for blocking a DC component, and
- means for controlling a voltage at the impedance element.
3 more elements
An inverter device for a stable, high power-factor current supply, the inverter device comprising:
- a rectifier receiving a source voltage from an AC power source and providing at an output a pulsating DC voltage,
- smoothing means receiving said pulsating DC voltage from said rectifier and providing at an output a smoothed DC voltage, said smoothing means including a condenser,
- an inverter circuit section connected in parallel with said smoothing means and including switching means receiving said smoothed DC voltage from the smoothing means including a chopper circuit and an oscillation circuit for generating a high frequency voltage in response to ON and OFF operation of said switching means, and
- an impedance element coupling said inverter circuit section to said AC power source and forming a current path for an input current to flow, from said AC power source through said impedance element and the switching means to said oscillation circuit.
1 more element
Dependencies are inferred from the claim text.