[특허]PWM driver for an inductive load with detector of a not regulating PWM condition

PWM driver for an inductive load with detector of a not regulating PWM condition 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03K-017/16 H03K-003/01
출원번호	US-0647851 (1996-05-15)
발명자 / 주소	Stoddard Robert J. Peppiette Roger C.,GB6 ITX EH13OHJ
인용정보	피인용 횟수 : 34 인용 특허 : 0

초록 ▼

A pulse width modulated (PWM) transistor driver circuit, for driving an inductive load, has a load-current sensing resistor and a comparator having an input connected to the sensing resistor and another input to which a PWM control reference voltage may be applied. A PWM driver-control circuit includes a set-dominant PWM latch, and a not.sub.-- regulating detector that may be composed entirely of logic circuit blocks or a combination of logic and analog circuits. By either means, the PWM bridge-control circuit includes a timer for repeatedly generating control pulses that set and hold a PWM latch beginning each PWM period, and the comparator resets the latch each time after the timer pulse the load current rises to exceed a corresponding reference voltage level. A sample-time-interval is defined beginning at the time of termination of a control pulse and a not.sub.-- regulating pulse generator produces a not.sub.-- regulating pulse only during the sample-time when the load current exceeds the level of the applied reference signal, indicating that the PWM system is failing to regulate the load current. Further, the not.sub.-- reg pulse width is, under most load conditions and over a wide range of applied reference voltage levels, a measure of the degree of failure of the PWM driver to regulate.

대표청구항 ▼

[ We claim:] [1.] A pulse width modulated (PWM) driver circuit for driving an inductive load including a driver transistor, a pair of driver-circuit load terminals to which a load may be connected, and a load-current sensing transducer for producing a load-current sense voltage that is directly related to the load current; said transistor and said pair of load terminals connected in series between a pair of DC supply voltage busses, a PWM reference-signal input conductor to which a driver-control reference voltage may be applied, and a sense-comparator having one input connected to said sensing transducer and having another input connected to said reference-signal input conductor for during each PWM period producing at a time t.sub.a a pulse at the output of the sense-comparator when the sense voltage exceeds the applied reference voltage, wherein the improvement comprises:a PWM bridge-control circuit means connected to the output of said sense-comparator and having an output connected to the control element of said driver transistor for repeatedly producing at said driver-transistor gating element a gating pulse initiated at time t.sub.1 for initiating each PWM period and for turning on said driver transistor, said driver transistor delaying turning off until a time t.sub.d after t.sub.a ;a sample-time logic means connected to said PWM bridge-control circuit for during each PWM period producing at least one logic pulse that includes a first logic-level transition at a time t.sub.2 after t.sub.1 and producing a second logic-level transition at a time t.sub.3 after t.sub.2 to define a sample-time interval t.sub.2 to t.sub.3 ; anda not.sub.-- regulating pulse generator means having one input connected to the output of said sample-time logic means and having another input connected to the output of said sense-comparator for producing a not.sub.-- reg pulse only during a sample-time interval, t.sub.2 to t.sub.3, in each PWM period and only when during a sample-time interval when the sense voltage exceeds the driver-control reference voltage that may be applied to said reference signal input conductor.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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PWM driver for an inductive load with detector of a not regulating PWM condition 원문보기

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PWM driver for an inductive load with detector of a not regulating PWM condition 원문보기

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