US 2014/0177165 A1 · MOTOR DRIVING CIRCUIT

Abstract

A first calculation unit subtracts third digital data which indicates the minimum value of the duty ratio from first digital data which indicates the duty ratio of the PWM driving operation. A slope calculation unit generates slope data which is dependent on the temperature based upon second digital data which indicates the temperature. A second calculation unit multiplies the slope data by the output data of the first calculation unit. A third calculation unit sums the output data of the second calculation unit and the third digital data. A selector receives the output data of the third calculation unit and the third digital data, selects one data that corresponds to the sign of the output data of the first calculation unit, and outputs the data thus selected as a duty ratio control signal.

Claims10

Dependent claims

1-9. (canceled)

A timing detection circuit configured to receive a signal that corresponds to a Hall signal output from a Hall sensor, and to generate a timing signal which is asserted at a predetermined timing in every cycle of the Hall signal, the timing detection circuit comprising:

a counter configured to perform a counting operation according to a clock signal;
a reset unit configured to reset the count value of the counter for every cycle of the counter, to a value obtained by multiplying the count value obtained immediately before the reset operation by a negative coefficient;
and
a comparison unit configured to assert the timing signal at every timing at which there is a zero-crossing in the value of the counter.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

14/193,123Filed 28 Feb 2014

Priority

JP 2010-07066425 Mar 2010

Published

26 Jun 2014

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02P 7/29
Controlling armature supply only: using pulse modulation
G06F 1/20
Constructional details or arrangements: cooling means
H02P 6/17
Circuit arrangements for detecting position: and for generating speed information
H03K 5/153
Manipulating of pulses not covered by one of the other main groups of this subclass: arrangements in which a pulse is delivered at the instant…

Motor driving circuit

Life of this patent

Motor driving circuit

Life of this patent

Abstract

Claims10