Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Satoshi Moriguchi

Satoshi Kominami

Koji Yoshida

Hideki Nakata

Satoshi Ikeda

Koji Akimasa

Damri Radenamad

Laksamee Tippayawat

A battery charger () non-concurrently performing a first operation to charge a main battery (MBA) and a sub-battery (SBA) by using an external power supply (AC), and a second operation to charge the sub-battery by using the main battery, including: a power supply circuit (); a transformer (); a secondary-side circuit () rectifying a voltage induced in a winding () and supplying the voltage to the main battery in a first time period for the first operation, and converting a DC voltage from the main battery into an AC voltage and supplying the AC voltage to the winding in a second time period for the second operation; a conduction angle adjustment circuit (); and a control circuit (), the secondary-side circuit being a full-bridge circuit including parallel-connected arms each including parallel-connected bodies connected in series, the parallel-connected bodies each including a switching unit and a rectifying unit connected in parallel.

Battery charging apparatus

A DC to DC converter includes: first and second switching elements connected at a first connection point between a first input/output terminal and a first ground terminal; third and fourth switching elements connected at a second connection point between the first input/output terminal and the first ground terminal; a resonant capacitor and a resonant inductor connected in series between the first and second connection points; fifth and sixth switching elements connected at a third connection point between a second input/output terminal and a second ground terminal; seventh and eighth switching elements connected at a fourth connection point between the second input/output terminal and the second ground terminal; a transformer; and a control circuit. The control circuit is operable to adjust the pulse waveforms for switching the fifth to eighth switching elements when voltage at the second input/output terminal is stepped down and output from the first input/output terminal.

DC-to-DC converter

A power converter including: a transformer in which first and second voltages are induced; a full-bridge circuit including parallel-connected first and second arms each including series-connected FETs; and a control circuit, wherein, within a given time period for which a voltage Vis the first voltage, the control circuit performs control so that FETs in at least one arm are on for an on time period, and, when P, P, P, &#x3b1;, and &#x3b2; respectively denote a duration of the on time period, a duration of the given time period, a duration of a time period from the end of the on time period to a time point of transition from the first to second voltage, a rise time of a body diode of each FET, and a fall time of the body diode, P&#x3e;(&#x3b2;/&#x3b1;)P, 0&#x2266;P&#x3c;&#x3b1;, and P+P&#x2266;Pare satisfied.

Power converter and battery charger using the same

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Kyoto, Japan

Satoshi Moriguchi