Sansha Electric Manufacturing Company, Limited

Hajime Katsushima

Kenji Morimoto

Toshikazu Fujiyoshi

Satoshi Yamamura

Hajime Yamamoto

Shigeru Okamoto

Masanori Yorinobu

A DC-DC converter includes a regeneration snubber circuit. The snubber circuit is connected in parallel with the secondary diode circuit and includes a series circuit of a discharge blocking diode, a snubber capacitor, and a switching element for regeneration connected in parallel with the discharge blocking diode. The DC-DC converter further includes a control unit which turns the switching element for regeneration on a predetermined time period after the timing of turning the primary side switching element off. The predetermined time period is set to approximately the time period during which the charge, accumulated in the snubber capacitor due to reverse recovery time when one of the secondary diodes has been turned off, discharges.

DC-DC converter including regeneration snubber circuit

This inverter circuit includes first and second switching elements and an output transformer which is provided with a first primary winding connected in series between said first and second switching elements, and also with a secondary winding for obtaining an output voltage. The inverter circuit is further provided with a first voltage supply, a second voltage supply, and a control unit. The first voltage supply applies voltage to said first switching element via said first primary winding. And the second voltage supply applies voltage to said second switching element via said second primary winding. The control unit turns said first switching element and said second switching element alternatingly ON and OFF. This inverter circuit also includes first and second regeneration snubber circuits for regenerating the charge charged into snubber capacitors.

Inverter circuit with controller for controlling switching elements based on a magnitude of output power

This DC-DC converter circuit includes: first and second switching elements (S, S); an output transformer (T) that includes a first primary winding (P) connected in series between the positive electrode sides of the first and second switching elements (S, S), a second primary winding (P) connected in series between their negative electrode sides, a secondary winding (S) for obtaining an output voltage, and tertiary windings (n, n); a first voltage source (C), connected between a first connection point at which the first primary winding (P) is connected to the second switching element (S) and the first switching element (S), that applies a voltage to the first switching element via the first primary winding; a second voltage source (C) connected to locations symmetric with those of the first voltage source (C); and a control unit (CT) that turns the first and second switching elements (S, S) alternatingly ON and OFF, and first and second regeneration snubber circuits (SN, SN) for regenerating the charge in snubber capacitors (C, C) to the voltage sources (C, C); and these regeneration snubber circuits (SN, SN) include third and fourth switching elements (S, S) driven by the output voltages of the tertiary windings (n, n).

DC-DC converter circuit

This inverter circuit includes two switching elements which are turned alternately ON and OFF, and a first primary winding connected in series between these switching elements, and also includes an output transformer having a secondary winding for obtaining an output voltage. This inverter circuit also includes a first voltage source and a second voltage source. The first voltage source applies a voltage to the first switching element via the first primary winding. And the second voltage source applies a voltage to the second switching element via the second primary winding. This inverter circuit also includes a regeneration snubber circuit for regenerating charge accumulated in a snubber capacitor. The regeneration snubber circuit includes a regeneration circuit including a voltage boost section which converts the primary side voltage of the output transformer to a predetermined voltage, which it outputs.

Current balanced push-pull inverter circuit with regeneration snubber circuit and voltage boost section

This inverter circuit includes first and second switching elements and an output transformer which has a first primary winding connected in series between the first switching element and the second switching element and a second primary winding for obtaining an output voltage. The inverter circuit also includes a first voltage source, a second voltage source, and a control unit. The first voltage source is connected between a first connection point at which the first primary winding is connected to the second switching element, and the first switching element, and applies a voltage to the first switching element via the first primary winding. And the second voltage source is connected between a second connection point at which the first primary winding is connected to the first switching element, and the second switching element, and applies a voltage to the second switching element via the first primary winding. The control unit alternately turns the first switching element and the second switching element ON and OFF. And this inverter circuit also may include first and second recovery snubber circuits for recovering electrical charge in snubber capacitors.

Current balanced push-pull inverter circuit

This current balanced push-pull type inverter circuit includes first and second switching elements, and an output transformer which includes a first primary winding and a second primary winding connected in series between said first and second switching elements, and also includes a secondary winding for obtaining an output voltage. This inverter circuit also includes a first voltage supply capacitor, a second voltage supply capacitor, and a control unit. A first snubber circuit, in which a first free wheel diode and first and second snubber capacitors are connected in series, is connected in inverse parallel to the first switching element. A first discharge resistor is connected between the first snubber capacitor and a first power supply capacitor, and a second discharge resistor is connected between the second snubber capacitor and a third power supply capacitor. And a second snubber circuit and discharge resistors are connected to the second switching element as well, in a similar manner.

Current balanced push-pull inverter circuit with snubber and discharge circuitry

This power supply device includes a series circuit of a first switching element and a second switching element connected in parallel with a DC power supply unit, and a smoothing filter circuit which includes a series circuit of an inductor and a smoothing capacitor connected in parallel with the second switching element. The power supply device also includes a control unit and a drive circuit for generating first and second PWM pulses by respectively driving the first and second switching elements ON and OFF, and for creating a dead time between those switching pulse signals. And this control unit changes the frequency of the switching pulse signal according to the pulse width of either the first PWM pulses or the second PWM pulses.

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Osaka, Japan

Hajime Katsushima