发明名称 |
DIGITAL PULSE WIDTH MODULATOR WITH INTEGRATED TEST AND CONTROL |
摘要 |
A pulse width modulator (PWM) circuit for generating pulses to enable a driver control unit to drive a pair of switching circuits for an electric motor including an input section for receiving an N bit digitized input signal to be modulated and a PWM counter for continuously counting up from zero to a predetermined number and back down to zero, the PWM counter generating a digitized triangular waveform having N bits of resolution corresponding to the predetermined number. A compare unit receives and compares the digitized input signal and the digitized triangular waveform to produce an output pulse and a dead-time generator unit produces a first pulse and a second pulse from the output pulse produced from the compare unit. The first and second pulses each drives a corresponding one of the switching circuits and the first and second pulses have different transition times relative to each other. A built-in test (BIT) circuit provides BIT input signals corresponding to the first and second pulses to verify correct operation of the PWM circuit including a feed back path from the driver control unit, the driver control unit having a higher level of integration than the PWM circuit, and the BIT input signals providing individual control of each of the PWM signals.
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申请公布号 |
WO9534941(A1) |
申请公布日期 |
1995.12.21 |
申请号 |
WO1995US06969 |
申请日期 |
1995.06.01 |
申请人 |
WESTINGHOUSE ELECTRIC CORPORATION |
发明人 |
MUNRO, JAMES, L.;LANSBERRY, GEOFFREY, B.;HERMAN, BETH, A. |
分类号 |
B60L11/12;B60L15/08;H02M7/537;H02M7/5387;H02P27/06;H03K7/08;(IPC1-7):H02M7/538 |
主分类号 |
B60L11/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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