Back to results
US 2016/0111989 A1Published application
Fan motor driving means, driving method, and cooling device and electronic equipment using the same
AssigneeRohm Co., Ltd.
InventorsYuki GOHARA, Tomofumi MISHIMA
Life of this patent
Estimating the term…
Abstract
The present invention inhibits the voltage jump of a source voltage or an output voltage by an approach which is different from a conventional one. A logic circuit allows an H bridge circuit to be shifted among a plurality of states in a specific sequence. A compulsory regenerating circuit is configured to be switched between an enabled state and a disabled state; while being in the enabled state, the current that flows in from a ground line via the H bridge circuit and a motor coil to a power line back-flows to the ground line.
Claims25
A motor driving device, characterized for driving a single-phase motor and comprising:
- an H bridge circuit, configured to receive a source voltage and a ground voltage, and couple to a motor coil of the single-phase motor between a first output and a second output thereof;
- a logic circuit, configured to allow the H bridge circuit to be shifted among a plurality of states in a specific sequence;
- and
- a compulsory regenerating circuit, configured to be switched between an enabled state and a disabled state, and while being in the enabled state, allow a current flowing from a ground line via the H bridge circuit and the motor coil to a power line to back-flow to the ground line.
1 more element
A motor driving device, characterized for driving a single-phase motor and comprising:
- an H bridge circuit, configured to receive a source voltage and a ground voltage, and couple to the motor coil of the single-phase motor between a first output and a second output thereof;
- a logic circuit, configured to control the H bridge circuit;
- and
- a compulsory regenerating circuit, configured to be switched between an enabled state and a disabled state, and while being in the enabled state, allow a current flowing from the ground line via the H bridge circuit and the motor coil to a power line to back-flow to the ground line;
- a first comparator, for comparing the voltage of the first output and a first threshold voltage;
- and
- a second comparator, for comparing the voltage of the second output and a second threshold voltage;
- and
- the logic circuit is configured to be sequentially shifted into at least the following states:
- (i) a first conducting state, in which the first output is set as the source voltage, and the second output is set as the ground voltage;
- (ii) a first regenerating state, in which the first output is set as the high_impedance state, and the second output is set as the ground voltage;
- (iii) a second regenerating state, in which the first output is set as the ground voltage, and the second output is set as the high_impedance state;
- (iv) a second conducting state, in which the first output is set as the ground voltage, and the second output is set as the source voltage;
- (v) a third regenerating state, in which the first output is set as the ground voltage, and the second output is set as the high_impedance state;
- and
- (vi) a fourth regenerating state, in which the first output is set as the high_impedance state, and the second output is set as the ground voltage;
- wherein
- the compulsory regenerating circuit, (a) while being in the second regenerating state, becomes into the enabled state based on the output of the first comparator, and becomes into the disabled state based on the output of the second comparator, (b) while being in the fourth regenerating state, becomes into the enabled state based on the output of the second comparator, and becomes into the disabled state based on to output of the first comparator.
15 more elements
A motor driving method, characterized for driving a single-phase motor and comprising the steps of:
- disposing an H bridge circuit, wherein the H bridge circuit receives a source voltage and a ground voltage, and couples to the motor coil of the single-phase motor between a first output and a second output thereof;
- disposing a compulsory regenerating circuit, wherein the compulsory regenerating circuit is configured to be switched between an enabled state and a disabled state, and while being in the enabled state, allow a current flowing from the ground line via the H bridge circuit and the motor coil to a power line to back-flow to the ground line;
- transiting, sequentially, into at least the following states:
- (i) a first conducting state, in which the first output is set as the source voltage, and the second output is set as the ground voltage;
- (ii) a first regenerating state, in which the first output is set as the high_impedance state, and the second output is set as the ground voltage;
- (iii) a second regenerating state, in which the first output is set as the ground voltage, and the second output is set as the high_impedance state, (iv) a second conducting state, in which the first output is set as the ground voltage, and the second output is set as the source voltage;
- (v) a third regenerating state, in which the first output is set as the ground voltage, and the second output is set as the high_impedance state;
- and (vi) a fourth regenerating state, in which the first output is set as the high_impedance state, and the second output is set as the ground voltage;
- when being in the second regenerating state, and when the voltage of the first output is lower than a first threshold voltage, setting the compulsory regenerating circuit into the enabled state;
- when being in the second regenerating state, and when the voltage of the second output is lower than a second threshold voltage, setting the compulsory regenerating circuit into the disabled state;
- when being in the fourth regenerating state, and when the voltage of the second output is lower than the first threshold voltage, setting the compulsory regenerating circuit into the enabled state;
- and
- when being in the second regenerating state, and when the voltage of the first output is lower than the second threshold voltage, setting the compulsory regenerating circuit into the disabled state.
10 more elements
Dependencies are inferred from the claim text.