Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Patent
1993-04-20
1995-04-04
Dolinar, Andrew M.
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
H03K 708
Patent
active
054041163
ABSTRACT:
A circuit for generating pulse width modulation (PWM) signal is formed of an U/D counter 4 for regulating a control cycle of a PWM waveform, a register 1C for storing on-timing information of the PWM waveform, and a register 1D for storing off-timing information of the PWM waveform. The circuit is actuated by one of first and second modes. In the first mode, the PWM waveform is outputted by comparing output of the counter 4 with the respective outputs of the registers 1C, 1D. In the second mode, the counter 4 counts down a signal, and after reaching zero, the counter counts up again, which is made within one cycle and is compared with only the output of the register 1C to output the PWM waveform. In the second mode, the reset level is not calculated, so that load to CPU is relieved, and the carrier cycle is shortened.
REFERENCES:
patent: 5070312 (1991-12-01), Cho
patent: 5298871 (1994-03-01), Shimohara
Dolinar Andrew M.
Fuji Electric & Co., Ltd.
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