US 6,320,774 B2 · AC waveform inverter power supply apparatus for metallic member joining or reflow soldering

Abstract

The number of cycles R of a fundamental frequency <SET>F (Hz) for a set value Tw (ms) of a set weld time [WELD] is first found as a real number. The number of cycles R conforms to the number of times (real number) of repetition of the fundamental frequency <SET>F cycle in the interval of the set weld time Tw and is given as Tw×<SET>F (step B1). An AC waveform cycle set value Ns (integer) for the set weld time Tw is then determined as an integer Min [N] that is equal to the number of cycles R or to the least one (i.e., the integer closest to R) of larger integers (N) than R (step B2). An AC waveform cycle set frequency Fs (Hz) and a period Ts (ms) for the set weld time Tw is then found from the set number of cycles Ns. The set frequency Fs and the period Ts are given as Fs=1/Ts and Ts=Tw/Ns, respectively (step B3). The thus obtained values (data) of the set frequency Fs and set number of cycles Ns are stored in the memory at predetermined storage positions thereof and are indicated on a setting screen (step B4).

Claims9

Dependent claims

An AC waveform inverter power supply apparatus for metallic member joining, comprising:

a rectifying circuit which converts an AC voltage of a commercial frequency into a DC voltage;
an inverter which converts said DC voltage output from said rectifying circuit into a pulsed voltage of a high frequency;
a transformer having primary terminals and secondary terminals, said primary terminals being electrically connected to output terminals of said inverter, said secondary terminals being electrically connected to electrodes, respectively, which join workpieces in the form of metallic members together, without intervention of any rectifying circuit;
weld time setting means arranged to set a weld time by the unit of time;
AC waveform cycle setting means arranged to divide said set weld time into a plurality of AC waveform cycles;
and
inverter control means arranged to provide a control of switching operations of said inverter in such a manner as to allow said inverter to issue said high-frequency pulses with one polarity in the former half cycle of divided each AC waveform cycle but to issue said high-frequency pulses with the other polarity in the latter half cycle thereof.

4 more elements

An AC waveform inverter power supply apparatus for reflow soldering, comprising:

a rectifying circuit which converts an AC voltage of a commercial frequency into a DC voltage;
an inverter which converts said DC voltage output from said rectifying circuit into a pulsed voltage of a high frequency;
a transformer having primary terminals and secondary terminals, said primary terminals being electrically connected to output terminals of said inverter, said secondary terminals being electrically connected to terminals, respectively, of a reflow soldering heater tip, without intervention of any rectifying circuit;
current-supplying time setting means arranged to set a current-supplying time by the unit of time;
AC waveform cycle setting means arranged to divide said set current-supplying time into a plurality of AC waveform cycles;
and
inverter control means arranged to provide a control of switching operations of said inverter in such a manner as to allow said inverter to issue said high-frequency pulses with one polarity in the former half cycle of divided each AC waveform cycle but to issue said high-frequency pulses with the other polarity in the latter half cycle thereof.

4 more elements

Dependencies are inferred from the claim text.

AC waveform inverter power supply apparatus for metallic member joining or reflow soldering

Life of this patent

AC waveform inverter power supply apparatus for metallic member joining or reflow soldering

Life of this patent

Abstract

Claims9