Semiconductor device and electrically-powered equipment
First Claim
1. A semiconductor device which selectively supplies currents to coils with a plurality of coil phases of a brushless DC (Direct Current) motor including a rotor having a permanent magnet with a plurality of poles and a stator having the coils with the coil phases, and controls rotation driving of the rotor,wherein, when electricity is supplied sequentially to the coil with one coil phase, detection is made on a difference of signals corresponding to currents flowing respectively to coils with other plurality of coil phases, coupled to the electrically supplied coil phase, due to an effect of a magnetic flux of a stopped rotor, thereby determining a stop position of the rotor with respect to the stator, based on relationship between a detection result and a coil phase in association with each other, andwherein an electrically conductive phase of the coil is determined based on the result of the detection result, to start to rotate the rotor in a predetermined direction.
2 Assignments
0 Petitions
Accused Products
Abstract
When electricity is supplied sequentially one by one to coils with a plurality of coil phases provided in a stator of a brushless DC motor, detection is made on a difference of signals corresponding to currents flowing respectively to coils with another plurality of coil phases coupled to the electrically conductive coil phases due to an effect of a magnetic flux of a stopped rotor. A stop position of the rotor with respect to the stator is determined, based on the relationship between a result of the detection operation and a coil phase in association with each other.
9 Citations
20 Claims
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1. A semiconductor device which selectively supplies currents to coils with a plurality of coil phases of a brushless DC (Direct Current) motor including a rotor having a permanent magnet with a plurality of poles and a stator having the coils with the coil phases, and controls rotation driving of the rotor,
wherein, when electricity is supplied sequentially to the coil with one coil phase, detection is made on a difference of signals corresponding to currents flowing respectively to coils with other plurality of coil phases, coupled to the electrically supplied coil phase, due to an effect of a magnetic flux of a stopped rotor, thereby determining a stop position of the rotor with respect to the stator, based on relationship between a detection result and a coil phase in association with each other, and wherein an electrically conductive phase of the coil is determined based on the result of the detection result, to start to rotate the rotor in a predetermined direction.
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8. An electrically-powered equipment comprising:
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a brushless DC (Direct Current) motor which includes a rotor having a permanent magnet with a plurality of poles and a stator having coils of a plurality of coil phases; a semiconductor device which selectively supplies currents to the coil phases of the brushless DC motor, and controls rotation driving of the rotor; and an operative mechanism which operates the brushless DC motor as a power source, and wherein, when electricity is supplied sequentially to a coil with one coil phase, the semiconductor device detects a difference of signals corresponding to currents flowing respectively to coils with other plurality of coil phases coupled to the electrically supplied coil phase due to an effect of a magnetic flux of a stopped rotor, thereby determining a stop position of the rotor with respect to the stator, based on relationship between a detection result and the coil phase in association with each other, wherein an electrically conductive phase of a coil is determined in accordance with the determination result, to start to rotate the rotor in a predetermined direction, and wherein the stop position of the rotor with respect to the stator is determined based on a relationship between an acquired count value and the plurality of coil phases in association with each other.
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9. A semiconductor device which controls driving of a brushless DC (Direct Current) motor including a rotor having a permanent magnet with a plurality of poles and a stator having coils with a plurality of coil phases, comprising:
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a pulse generation circuit which generates a pulse control signal for selectively supplying currents to the coils with the coil phases of the brushless DC motor; a selector circuit which selects arbitrary two signals, from detection signals corresponding to currents flowing respectively to the coils and a reference signal; a comparator circuit which compares the two signals selected by the selector circuit; a timer counter; and a control circuit, wherein the control circuit repeatedly controls an operation for the pulse generation circuit to output a pulse control signal for supplying electricity to one of the coil phases in a state where the rotor is stopped, an operation for the selector circuit to select a detection signal corresponding to a current flowing from the electrically supplied coil to two coils with other coil phases coupled thereto, from the detection signals, and an operation for the timer counter to measure a time until determination of a state in which the selected two detection signals coincide with each other based on an output of the comparator circuit, while sequentially switching the electrically supplied coil phases, thereby determining a stop position of the rotor with respect to the stator, based on relationship between a result of measurement operation by the timer counter and the coil phases in association with each other, and wherein the control circuit controls the pulse generation circuit to output a pulse control signal for electrically conducting from a coil with one of the coil phases to a coil with another coil phase. - View Dependent Claims (10, 11, 12, 13)
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14. An electrically-powered equipment comprising:
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a brushless DC (Direct Current) motor which includes a rotor having a permanent magnet with a plurality of poles and a stator having coils with a plurality of phases; a semiconductor device which selectively supplies currents to the coil phases of the brushless DC motor, and controls rotation driving of the rotor; and an operative mechanism which operates the brushless DC motor as a power source, and wherein the semiconductor device has a pulse generation circuit for generating a pulse control signal for selectively supplying a current to coils with a plurality of phases of the brushless DC motor, a selector circuit for selecting arbitrary two signals from a reference signal and detection signals corresponding to a current flowing to the coils, a comparator circuit for comparing the two signals selected by the selector circuit, a timer counter, and a control circuit, wherein the control circuit repeatedly controls an operation for the pulse generation circuit to output a pulse control signal for supplying electricity to one of the coil phases in a state where the rotor is stopped, an operation for the selector circuit to select a detection signal corresponding to a current flowing from the electrically supplied coil to two coils with other plurality of coil phases coupled thereto, from the detection signals, and an operation for the timer counter to measure a time until determination of a state in which the selected two detection signals coincide with each other based on an output of the comparator circuit, while sequentially switching the electrically supplied coil phases, thereby determining a stop position of the rotor with respect to the stator, based on relationship between a result of measurement operation by the timer counter and a coil phase in association with each other, and wherein the stop position of the rotor with respect to the stator is determined based on a relationship between an acquired count value and the plurality of coil phases in association with each other.
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15. A semiconductor device which selectively supplies currents to a plurality of coil phases of a brushless DC (Direct Current) motor including a rotor having a permanent magnet with a plurality of poles and a stator having coils with the coil phases, and controls rotation driving of the rotor,
wherein, in a stopped state of the rotor, when electricity is supplied sequentially to a coil with one coil phase, detection is made on a difference of signals corresponding to currents flowing respectively to coils with other plurality of coil phases coupled to the electrically supplied coil phase due to an effect of a magnetic flux of a stopped rotor, using a comparator circuit and a timer inputting its comparison result, thereby determining a stop position of the rotor with respect to the stator, based on relationship between a detection result and a coil phase in association with each other, wherein, in a rotation state of the rotor, detection is made on a timing at which a signal, corresponding to a current flowing to an electrically non-conductive coil due to the effect of the magnetic flux of the rotor, reaches a reference signal, when electrical conduction is made from a coil with one of the coupled coil phases to a coil with another coil phase, using the comparator circuit and the timer, thereby determining a rotation position of the rotor with respect to the stator, and wherein the stop position of the rotor with respect to the stator is determined based on a relationship between an acquired count value and the plurality of coil phases in association with each other.
Specification