INVERTER CONTROLLER, COMPRESSOR, AND ELECTRIC HOME APPLIANCE
First Claim
1. An inverter controller comprising:
- (a) an inverter circuit for driving a brushless DC motor;
(b) a position sensing circuit for sensing an induction voltage of the motor and a spike voltage occurring when a commutation is switched in the inverter circuit;
(c) a position sensing determiner for sensing a rotating position and an rpm of a rotor of the motor based on the induction voltage sensed by the position sensing circuit, and outputting a rotating position sensing signal of the rotor;
(d) a spike voltage determiner for measuring a time duration of the spike voltage;
(e) a commutation controller for setting a time between an output of the position sensing signal of the rotor and a start of a commutation work to be done by the inverter circuit based on a conduction angle of a motor current of the motor, a phase advancing angle of the motor current with respect to the induction voltage, and the rpm; and
(f) a conduction angle controller for changing the conduction angle in electric angles of the inverter circuit within a given angle range,wherein the conduction angle in the inverter circuit is reduced when a time difference between intervals of each of outputs of position sensing signals of the rotor and a total time of a time from an occurrence of the position sensing signal until the start of the commutation work to be done by the inverter circuit plus a time duration of the spike voltage becomes shorter than a predetermined reference time.
1 Assignment
0 Petitions
Accused Products
Abstract
An inverter controller reduces a conduction angle of inverter circuit (204) within a range greater than 120 degree in electric angles when a time difference between intervals between each of position sensing and a total time of a time from an occurrence of a position sensing signal until the start of a commutation work to be done by inverter circuit (204) plus a time duration of a spike voltage becomes shorter than a predetermined reference time. This reduction of the conduction angle allows increasing a position sensible range, so that a position of magnetic poles of a rotor cannot be missed. The inverter controller thus can prevent a motor from falling into out-of-sync caused by a change in load or in voltage.
-
Citations
21 Claims
-
1. An inverter controller comprising:
-
(a) an inverter circuit for driving a brushless DC motor; (b) a position sensing circuit for sensing an induction voltage of the motor and a spike voltage occurring when a commutation is switched in the inverter circuit; (c) a position sensing determiner for sensing a rotating position and an rpm of a rotor of the motor based on the induction voltage sensed by the position sensing circuit, and outputting a rotating position sensing signal of the rotor; (d) a spike voltage determiner for measuring a time duration of the spike voltage; (e) a commutation controller for setting a time between an output of the position sensing signal of the rotor and a start of a commutation work to be done by the inverter circuit based on a conduction angle of a motor current of the motor, a phase advancing angle of the motor current with respect to the induction voltage, and the rpm; and (f) a conduction angle controller for changing the conduction angle in electric angles of the inverter circuit within a given angle range, wherein the conduction angle in the inverter circuit is reduced when a time difference between intervals of each of outputs of position sensing signals of the rotor and a total time of a time from an occurrence of the position sensing signal until the start of the commutation work to be done by the inverter circuit plus a time duration of the spike voltage becomes shorter than a predetermined reference time. - View Dependent Claims (2, 3, 8, 9, 10, 11, 12, 13, 14)
-
-
4. An inverter controller comprising:
-
(a) an inverter circuit for driving a brushless DC motor; (b) a position sensing circuit for sensing an induction voltage of the motor; (c) a position sensing determiner for outputting a position sensing signal of the rotor based on the induction voltage sensed by the position sensing circuit; (d) a position sense waiting section for setting a wait time before the position sensing determiner starts sensing the induction voltage; (e) a commutation controller for setting a time between an output of the position sensing signal of the rotor and a start of a commutation work to be done by the inverter circuit based on a conduction angle of a motor current of the motor, a phase advancing angle of the motor current with respect to the induction voltage, and the rpm; and (f) a conduction angle controller for changing the conduction angle in electric angles of the inverter circuit within a given angle range, wherein the conduction angle is reduced when a time difference between intervals of each of position sensing done in the position sensing determiner and a wait time set in the position sense waiting section becomes shorter than a predetermined reference time. - View Dependent Claims (5, 6, 7, 15, 16, 17, 18, 19, 20, 21)
-
Specification