Motor drive circuit

Details Motor drive circuit Motor drive circuit

2007-07-24

2007-07-24

Duda, Rina (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S811000, C318S432000

Reexamination Certificate

active

11430888

ABSTRACT:
A motor drive circuit is provided and includes: a PWM wave generation circuit for generating a PWM (pulse-width-modulated) wave having a high frequency, whose pulse width has been modulated, in response to a rotational frequency control signal used for driving a motor; a switching element (FET) that receives an input of a PWM wave output from the PWM wave generation circuit and performs switching operation; and a current resonance circuit including an inductance and a capacitor. Current resonance is induced in response to power of a battery cell imparted by means of operation of the switching element. A value falling within the range of 60 to 90 KHz, which is 1.1 to 1.7 times as large as a switching frequency 54 KHz of the switching element, may be selected and set for the resonance frequency.

REFERENCES:
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patent: 5789723 (1998-08-01), Hirst
patent: 6847016 (2005-01-01), Hirst
patent: 6847186 (2005-01-01), Kerlin
patent: 1 087 249 (2001-03-01), None
patent: 6-243962 (1994-09-01), None
patent: 7-245958 (1995-09-01), None
patent: 8-51781 (1996-02-01), None

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