Sansha Electric Manufacturing Company, Limited

Kenzo Danjo

Haruo Moriguchi

Hideo Ishii

Tetsuro Ikeda

Masao Katooka

Shigeru Okamoto

Kunio Karino

Toshikazu Fujiyoshi

Atsushi Kinoshita

Takeshi Morimoto

Toru Arai

Yuji Ikejiri

Takashi Hashimoto

Masaharu Tanaka

Masahiro Aoyama

Tetsurou Ikeda

Kunio Shikata

Takashi Tsujii

Shuji Yokoyama

Hiroki Morimoto

Hideo Isii

Masataka Nishimura

Masayuki Ono

Takeshi Omura

Takamitsu Imahori

Fumi Noda

Karino Kunio

Atushi Kinoshita

An arc welding apparatus includes a main power supply circuit for outputting an arc current, a control circuit for controlling the main power supply circuit, and a high-frequency voltage generating circuit for generating a high-frequency voltage. When an operation switch is turned on for a first time since the apparatus is powered on, the control circuit activates the main power supply circuit to output a high voltage, and the high-frequency voltage generating circuit to generate a high-frequency voltage. With the high voltage superimposed on the high-frequency voltage, the control circuit passes a welding arc current through a torch and a base material. The switch is then turned off, and the control circuit passes a pilot arc current through the torch and the base material. The switch is turned on again, and the control circuit activates the main power supply circuit to output a high voltage, thereby allowing smooth arc transition.

Arc welding apparatus and method

A printed circuit board () includes an insulating substrate () on which conductive films () are formed. Semiconductor devices () disposed external to the printed circuit board () have their leads () connected to the conductive films. A flexible portion () is formed in the insulating substrate () at a location near the location where the leads () are connected to the conductive films ().

Heat sink arrangement for electrical apparatus

An output of a rectifying circuit (), which rectifies commercial AC power, is supplied to an inverter () through a power factor correction circuit (). The output of the inverter () is voltage-transformed in a transformer (), rectified in a rectifying circuit () and is applied to a xenon lamp (). A secondary winding () of a transformer () of an igniter () is connected between the rectifying circuit () and the xenon lamp () in order to generate an arc in the xenon lamp (). A pulse generator provides a pulse for a short time period to a primary winding () of the transformer (). An auxiliary power supply () supplies arc-sustaining current prepared based on the commercial AC power to the junction of the rectifying circuit () and the secondary winding () of the transformer ().

Power supply apparatus for arc-generating load

Lighting of a discharge lamp is controlled in a manner to reduce deterioration of the discharge lamp subjected to high temperature and extend the lifetime of the discharge lamp. A method for controlling lighting of the discharge lamp includes a first constant current control process (period T, which corresponds to steps Sand S) in which constant current control is executed by supplying a first current to the discharge lamp, a second constant current control process (period T, which corresponds to steps Sand S) in which constant current control is executed by supplying a second current greater than the first current to the discharge lamp after the first constant current control process, and a constant power control process (period T) in which constant power control is executed after the second constant current control process.

Discharge lamp lighting control method, computer program, discharge lamp lighting control apparatus, and power supply circuit

A rectifying circuit () converts inputted AC power to DC power. An inverter circuit () converts the DC power to high-frequency power in accordance with a switching control signal applied thereto from a control circuit (). A voltage transformer () voltage-transforms the voltage of the high-frequency power. An output-side rectifying circuit () rectifies the voltage-transformed power. An output detecting circuit () detects the magnitude of the voltage of the rectified power, and a signal representative of the detected voltage is applied to the control circuit (). The control circuit () generates such a switching control signal as to make the rectified power have a predetermined value. The value of the voltage from the rectifying circuit () is detected by an input detecting circuit (), and a signal representative of the detected voltage is applied to the control circuit (). The control circuit () controls the operation of the inverter circuit () in accordance with the detected voltage representative signal from the input detecting circuit () and the saturation magnetic characteristic of the voltage-transformer ().

Power supply apparatus

A welder power supply apparatus () includes an inverter (), which is driven intermittently when an electrode () and a workpiece () are separated from each other and no arc is being generated between them, whereby power loss generated in the inverter () when the inverter () is driven in the non-load state of the power supply apparatus and power loss caused by exciting current flowing through an transformer () disposed in the output of the inverter () can be reduced. The inverter () is driven continuously when output current (Io) becomes higher than a threshold value (Ib) after the electrode () and the workpiece () are brought into contact with each other for starting arcing between them. In this manner, the arcing can be initiated without fail.

Power supply apparatus for welder

A power supply apparatus for use with arc-utilizing apparatuses includes a plurality of power supply blocks of the same capacity. Each power supply block includes an input-side rectifying circuit, an inverter, a transformer, and an output-side rectifying circuit. The inverter is controlled by a control circuit in such a manner that high-frequency current flowing the inverter or current flowing through the output-side rectifying circuit can correspond to a reference signal provided by a reference signal generator. The outputs of the output-side rectifying circuits of the power supply blocks are connected in parallel with each other. The values of the reference signals generated by the reference signal generators are made always equal by the action of equipotential lines.

Power supply apparatus for arc-utilizing apparatuses

Welding conditions are set for a power supply apparatus for use with a welding machine, using a control panel unit (). A memory () stores therein welding conditions as set through the control unit (), and holds the set welding conditions after turning off of a main power supply switch () of the power supply apparatus. Upon turning on of the main power switch () for starting welding, the welding conditions stored and held in the memory () are read out and set in the power supply apparatus.

One of a plurality of voltages is adapted to be applied to power supply terminals (). A rectifying circuit () rectifies the applied voltage and develops a rectified voltage between the output terminals () thereof. Inverters () are connected into one of a plurality of inverter connections between the rectifier output terminals () in response to one of a plurality of inverter connection indicative signals. The inverter connections are set to correspond to respective ones of the plurality of voltages, so that a predetermined voltage can be applied to each inverter whichever one of the plurality of voltages is applied to the power supply terminals. An inverter connection indicative signal generating circuit () is manually operated to generate a desired one of the inverter connection indicative signals. A thyristor () is disposed between the rectifier output terminals () and the inverters (). When one of the plurality of voltages is applied to the power supply terminals, a voltage detecting circuit () generates an inverter connection indicative signal corresponding to the voltage applied to the power supply terminals. A judging unit () determines whether or not the inverter connection indicative signals from the voltage detecting circuit () and the inverter connection indicative signal generating circuit () match. When the two signals match, a thyristor control unit () provides a CLOSE signal to the thyristor (). When the two signals do not match, an alarm circuit () is activated.

An input rectifier of a power supply apparatus rectifies a selected one of two, higher and lower AC voltages applied to it. First and second inverters are connected in the output of the input rectifier. A high-frequency transformer is connected to the output of each of the first and second inverters. An output rectifier is connected to the output of each of the high-frequency transformers. When the higher one of the two AC input voltages is applied to the input rectifier, a switching circuit connects the first and second inverters in series between output terminals of the input rectifier. When the lower AC voltage is applied to the input rectifier, the switching circuit connects the first and second inverters in parallel between the output terminals of the input rectifier. When the first and second inverters are connected in series between the output terminals of the input rectifier, a voltage balancing control unit operates to suppress imbalance between input voltages to the first and second inverters.

Power supply apparatus for arc-utilizing apparatus

An input-side rectifier (), a smoothing capacitor (), an inverter (), a transformer () and an output-side rectifier () operate together to convert an AC voltage supplied from an AC power supply to a DC voltage. The DC voltage is coupled through a DC-to-AC converter () to a workpiece () and a torch (). An auxiliary voltage supply () supplies the workpiece () and the torch () with a negative voltage for a short time following the transition of the AC voltage supplied to the workpiece () and the torch () from positive to negative. The negative voltage has a negative peak value larger than the negative peak value of the AC voltage supplied to the workpiece () and the torch (), and rapidly changes from the negative peak value. The auxiliary voltage supply () produces a DC voltage having a negative peak value larger than the negative peak value of the AC voltage supplied to the workpiece () and the torch (), by means of a transformer (), a rectifier () and a smoothing capacitor (). The smoothing capacitor () is coupled to the workpiece () and the torch () through a transistor () and a current-limiting resistor (). A differentiating circuit () is coupled in parallel with the current-limiting resistor (), and includes a resistor () having a smaller resistance value than the current-limiting resistor ().

A power supply apparatus has a case ( ) with a control panel ( ) mounted thereon. Plural controllers are disposed on the panel ( ). A cover ( ) is mounted to cover and uncover the panel ( ). One ( ) of the controllers is so disposed as to be externally operable.

A power supply apparatus for a light source includes an input-side rectifier ( ) which converts an input AC signal to a DC signal, and a high-frequency inverter ( ) which converts the DC signal to a high-frequency signal. An output-side rectifier ( ) converts the high-frequency signal to a DC output signal for application to the light source. Power detecting means ( ) detects the power supplied to the light source through the application of the DC output signal thereto, and develops a power representative signal. A control circuit ( ), a summer ( ) and an error amplifier ( ) cooperate to control the high-frequency inverter ( ) in accordance with the power representative signal in such a manner that power of a predetermined value can be supplied to the light source. An input current detector ( ) detects the input AC signal current value and develops an input current representative signal. When the input current representative signal is smaller than a predetermined input current reference value, a summer ( ) and an error amplifier ( ) cooperate to provide the summer ( ) with such a control signal as to maintain the input AC signal current value at a predetermined value.

Power supply apparatus for light source

A power supply apparatus for a welder includes a rectifier ( ) and a smoothing reactor ( ) which operate together to convert a commercial AC supply voltage to a DC voltage. The DC voltage is converted to a high-frequency voltage by an inverter ( ), which, in turn, is voltage-transformed by a voltage-transformer ( ). The voltage-transformed, high-frequency voltage is converted to a DC voltage by a rectifying diode ( ) and a smoothing reactor ( ), and the resulting DC voltage is applied to a workpiece ( ) and a torch ( ). A current detector ( ) develops a load current representative signal, and a control circuit ( ) so controls a drive circuit ( ) which drives the inverter ( ) that the load current representative signal becomes equal to a reference current signal provided by a reference source ( ). When a small load current is used, a pulse forming switch ( ) is repetitively turned on and off to produce a pulse current from a pulse current setting source ( ). The pulse current is superposed on a control signal from the control circuit ( ).

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Osaka, Japan

Kenzo Danjo