MOTOR DRIVING CIRCUIT

PROBLEM TO BE SOLVED: To provide a motor driving circuit which can elongate the life of a battery by reducing the power consumption of a motor used in binoculars, a camera, or the like, and can obtain high motor revolution. SOLUTION: This motor driving circuit is provided with a PWM wave generating...

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Bibliographic Details
Main Authors NAGATA KOICHI, TAKAHASHI SHUSUKE
Format Patent
LanguageEnglish
Published 24.11.2006
Subjects
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
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Summary:PROBLEM TO BE SOLVED: To provide a motor driving circuit which can elongate the life of a battery by reducing the power consumption of a motor used in binoculars, a camera, or the like, and can obtain high motor revolution. SOLUTION: This motor driving circuit is provided with a PWM wave generating circuit 12 which generates a PWM wave of a high-frequency oscillating frequency being pulse-width modulated, corresponding to a revolution control signal for driving a motor 1, a switching element (FET)14 which performs switching operation, receiving the input of the PWM wave outputted from the PWM wave generating circuit 12, and a current resonating circuit which comprises an inductance Lr and a capacitor Cr, and resonates a current to the power of a battery 16 given by the operation of the switching element 14. For the resonance frequency, a value of 60-90 KHz which is 1.1 to 1.7 times the switching frequency 54 KHz of the switching element 14 is selected and set. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20050138038