Sansha Electric Manufacturing Company, Limited

Toru Arai

Hideo Ishii

Masao Katooka

Kenzo Danjo

Shigeru Okamoto

Haruo Moriguchi

Toshikazu Fujiyoshi

Masaharu Tanaka

Masayuki Ono

Tetsuro Ikeda

Satoshi Hamada

Kunio Shikata

Yoshiyuki Nishioka

Makoto Sakurada

Atsushi Makitani

Takeshi Omura

Masaru Nishizuka

Hisashi Nishio

Goro Nakano

A power supply unit includes an input-side rectifying circuit (), an inverter () and an output-side rectifying circuit (), which include power semiconductor devices. The power supply unit is powered during a powering period, and the powering is interrupted during a pausing period. The powering and pausing periods alternate. A fan () is driven during each powering period to cool the power semiconductor devices. A temperature detector () measures the temperature of the power semiconductor devices and develops a measured-temperature representative signal. A setter () produces a reference value, which decreases over the pausing period from the measured-temperature representative signal at the beginning of the pausing period to an intended-temperature representative signal representing the temperature to be attained by the power semiconductor devices at the end of the pausing period. The reference value is prepared from the measured-temperature representative signal at the beginning of the pausing period, the intended-temperature representative signal, and the length of the pausing period. An error amplifier () and a fan control unit () control the rotation rate of the fan () to make the measured-temperature representative signal track the reference value.

Power supply apparatus

A power supply apparatus for use in electroplating includes an input-side rectifier ( ). A rectifier output is converted into high-frequency signals in inverters ( ), which are transformed in transformers ( ). When the transformed high-frequency signals from the transformers are of positive polarity, they are rectified by a diode ( or ) to cause a positive current to be supplied to a load ( ). When the transformed high-frequency signals are of negative polarity, they are rectified by a diode ( or ) to thereby cause a negative current to flow through the load. A first IGBT ( ) is connected in series with each of the diodes ( ) and is rendered conductive and nonconductive at a frequency lower than the high-frequency signal. Also, a second IGBT ( ) is connected in series with each of the diodes ( and ) and is rendered nonconductive when the IGBT and nonconductive at the lower frequency. When the first IGBT is rendered conductive, the second IGBT is rendered nonconductive, and vice versa. The inverters ( ) are controlled in synchronization with the first and second IGBTs ( ) in such a manner that the high-frequency signal can have a larger magnitude when the second IGBT ( ) is conductive than when the first IGBT ( ) is conductive.

AC/DC/HFAC/DC/AC power supply

An electroplating current supply system includes a power supply unit for supplying an object to be plated ( ) with an electroplating current whose polarity is inverted at predetermined intervals. The power supply unit includes a first DC power supply ( A) supplying a positive current and a second power supply ( B) supplying a negative current. The system includes further a processing unit ( ) for controlling the ratio in magnitude and duration of the positive current (I ) to the negative current (I ) supplied to the object so as to plate the object with a uniform coating.

Electroplating current supply system

A DC power supply apparatus has two power supply input terminals between which one of 100 V level, 200 V level and 400 V level AC power supply voltages or a 575 V AC power supply voltage is applied. A rectifying unit is connected between the two power supply input terminals, and a voltage-lowering converter is connected to the rectifying unit. A thyristor is connected between the input and output of the voltage-lowering converter. A series combination of two capacitors is connected between two output terminals of the voltage-lowering converter. A switch circuit is connected between the junction of the two capacitors and one input terminal of the rectifying unit. An inverter converts a DC voltage appearing across the series combination of the capacitors into a high-frequency voltage, which, in turn, is voltage transformed by a transformer. The voltage-transformed high-frequency voltage is converted into a DC voltage in a high-frequency-to-DC converter for application to a load. When a 100 V level voltage is applied between the power supply input terminals, the thyristor is turned on, the voltage-lowering converter is turned off and the switch circuit is turned on. When one of the 200 V level voltages is connected, the thyristor is turned on, the voltage-lowering converter is turned off, and the switch circuit is turned off. When one of the 400 V level voltages or the 575 V voltage is applied between the power supply input terminals, the thyristor is turned off, the voltage-lowering converter is turned on, and the switch circuit is turned off.

DC power supply apparatus for arc-utilizing apparatuses

A voltage from an AC power source is converted into a DC voltage in an input-side rectifier-smoother circuit. The DC voltage is then converted into a high-frequency voltage in an inverter, and the resulting high-frequency voltage is voltage-transformed in a transformer. The voltage-transformed high-frequency voltage is converted into a DC voltage in an output-side rectifier-smoother circuit, which is applied via output terminals to a load. The input-side and output-side rectifier-smoother circuits, the inverter and the transformer are enclosed in a casing having a plastic panel. The output terminal of the apparatus is mounted on the plastic panel. When a temperature sensing unit with a temperature sensor disposed on the panel near the output terminal senses that the temperature of the panel has risen above a predetermined temperature, which is lower than the heat deformation temperature of the panel, a gate signal ON-OFF circuit prevents a gate signal from a gate signal generating circuit from being coupled to the inverter. The gate signal ON-OFF circuit permits the gate signal to be coupled to the inverter when the temperature sensing unit senses that the temperature of the panel has decreased below the predetermined temperature.

A DC voltage from a DC supply is applied to inverters of two power supply units connected in parallel with each other. The inverters convert the received DC voltages into high-frequency voltages, which are, in turn, voltage-transformed in transformers. The outputs of the transformers are rectified in two rectifiers, respectively, and smoothed in two reactors. The smoothed voltages are supplied between output terminals. The reactors are formed on a single core, being loosely coupled with each other.

A DC power supply apparatus includes a rectifier circuit which rectifies an input commercial AC voltage. The rectifier output voltage is smoothed in a smoothing capacitor. The DC voltage from the capacitor is converted to a high-frequency voltage in an inverter. The high-frequency voltage from the inverter is voltage-transformed by a transformer into a voltage-transformed, high-frequency voltage, which is then converted back into a DC voltage in a high-frequency-to-DC converter circuit. When an input commercial AC voltage is applied to the DC power supply apparatus, a pre-charging circuit pre-charges the smoothing capacitor from the input AC voltage. If a voltage having a magnitude larger than a prescribed value is applied to the DC power supply apparatus, an overvoltage protection circuit renders the rectifier circuit and the pre-charging circuit inoperative.

DC power supply apparatus

An input-side rectifier of a DC power supply apparatus receives and rectifies an AC voltage selected from first and second groups of AC voltages. The AC voltages in the second group are lower than those of the first group. A voltage boosting/lowering converter boosts or lowers the output voltage of the input-side rectifier to a voltage having a predetermined value. An inverter converts the output voltage of the voltage boosting/lowering converter to a high-frequency voltage. A voltage transformer transforms the high-frequency voltage from the inverter. An output-side rectifier rectifies the transformed high-frequency voltage from the transformer.

DC power supply apparatus including boosting/lowering converter unit and

A power supply apparatus includes a front panel, a rear panel and two left and right side panels which together form a housing. Opposed edges of a partition are connected to the front and rear panels to thereby divide the interior space of the housing into upper and lower chambers. The left and right side panels each have edges which are placed to abut against the corresponding edges of the other side panel. Components of a power supply circuit are appropriately distributed in the upper and lower chambers. Some of the components in the upper chambers are located beneath the upper abutting edges of said left and right side panels, and a cover is disposed to cover at least those components which are located beneath the upper abutting edges.

Waterproofed power supply apparatus

An inverter includes a series circuit of two current conducting units connected between two input terminals adapted to be connected to a DC power supply. Two first capacitors are connected in series between the two input terminals. A primary winding of a transformer is connected between the junction of the current conducting units and the junction of the first capacitors. Each of the current conducting units includes a parallel circuit of an IGBT, a diode and a second capacitor. The IGBT has a collector, an emitter and a gate and is rendered conductive when a control signal is applied to the gate while a voltage of a predetermined polarity is applied between the collector and the emitter. The diode is connected in inverse parallel with the IGBT. An inverter control circuit applies alternately the control signals to the respective IGBTs with a predetermined quiescent period disposed between the respective control signals applied.

Inverter and DC power supply apparatus with inverter used therein

A DC power supply apparatus includes an input-side rectifier which rectifies an input AC voltage and supplies the rectified voltage to a voltage-boosting converter. The voltage-boosting converter converts the supplied voltage to a voltage of a predetermined magnitude. The predetermined magnitude voltage is, then, converted to a high-frequency voltage by an inverter and applied to a primary winding of a transformer. An output-side rectifier rectifies a high-frequency voltage induced in a secondary winding of the transformer. The inverter includes IGBTs and diodes, which are connected in a full-bridge configuration. A capacitor is connected in parallel with each IGBT. When the IGBTs are rendered conductive by the charging and discharging of the capacitors, no current flows through the IGBTs, and when the IGBTs are rendered nonconductive, the voltages applied to the IGBTs are made to become zero.

A power supply apparatus includes first and second spaced-apart, substantially parallel panels, and a chassis disposed in substantially perpendicular to and between the first and second panels. Opposite edges of the chassis are coupled to the respective ones of the first and second panels to thereby partition the space between the first and second panels into upper and lower regions. A power supply circuit includes heat-generating electric components disposed in the lower region, and non-heat-generating components disposed in the upper region. The chassis has an opening therein and a heat sink is mounted to close the opening in the chassis. A semiconductor module of the power supply circuit is mounted on the surface facing to the upper region of the heat sink.

A power supply apparatus comprises a housing having a panel. A power supply circuit is disposed in the housing. The power supply circuit supplies power to a load. A control circuit controls the operation of the power supply circuit in accordance with control information. The control circuit is formed on a printed circuit board mounted on the panel in the housing. The printed circuit board is provided with a control which can be operated from outside the housing. The control provides the control information in response to operation thereof from outside the panel.

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Kyoto, Japan

Toru Arai