LOAD CONTROL DEVICE
First Claim
1. A two-wire load control device connected in series between an alternating current (AC) power source and a load, comprising:
- a main switching unit which has a main switch element connected in series to the AC power source and the load, and controls a supply of power to the load;
a manipulation switch which is manipulated by a user, and outputs a start-up signal for starting at least the load;
a control unit which is connected to the manipulation switch and controls opening/closing of the main switching unit based on a signal transmitted from the manipulation switch;
a first power supply unit, to which power is supplied from both terminals of the main switching unit through a rectifying unit, for supplying a stable voltage to the control unit;
a second power supply unit, to which power is supplied from both terminals of the main switching unit through the rectifying unit, for supplying power to the first power supply unit no power is supplied to the load; and
a third power supply unit for supplying power to the first power supply unit when power is supplied to the load in a closed state of the main switching unit,wherein upon receiving the start-up signal from the manipulation switch, the control unit outputs an initial drive signal for putting the main switch element in a conducting state to the main switching unit before a power source for supplying power to the first power supply unit is switched from the second power supply unit to the third power supply unit.
3 Assignments
0 Petitions
Accused Products
Abstract
A load control device includes: a main switching unit which has a main switch element connected in series to an AC power source and a load and controls the supply of power to the load; a manipulation switch that outputs a start-up signal for starting at least the load; a control unit which controls the opening and closing of the main switching unit; a first power source unit supplying a stable voltage to the control unit; and a second and a third power source unit each supplying power to the first power source unit. The load control device is characterized in that upon receiving the start-up signal, the control unit outputs an initial drive signal, for closing the main switch element, to the main switching unit before a power source supplying power to the first power source unit is switched from the second to the third power source unit.
18 Citations
49 Claims
-
1. A two-wire load control device connected in series between an alternating current (AC) power source and a load, comprising:
-
a main switching unit which has a main switch element connected in series to the AC power source and the load, and controls a supply of power to the load; a manipulation switch which is manipulated by a user, and outputs a start-up signal for starting at least the load; a control unit which is connected to the manipulation switch and controls opening/closing of the main switching unit based on a signal transmitted from the manipulation switch; a first power supply unit, to which power is supplied from both terminals of the main switching unit through a rectifying unit, for supplying a stable voltage to the control unit; a second power supply unit, to which power is supplied from both terminals of the main switching unit through the rectifying unit, for supplying power to the first power supply unit no power is supplied to the load; and a third power supply unit for supplying power to the first power supply unit when power is supplied to the load in a closed state of the main switching unit, wherein upon receiving the start-up signal from the manipulation switch, the control unit outputs an initial drive signal for putting the main switch element in a conducting state to the main switching unit before a power source for supplying power to the first power supply unit is switched from the second power supply unit to the third power supply unit. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A two-wire load control device connected in series between an AC power source and a load, comprising:
-
a main switching unit which includes a switch element having a transistor structure, and controls a supply of power to the load; an auxiliary switching unit which includes a switch element having a thyristor structure, and controls the supply of power to the load when the main switching unit is in a non-conducting state; a control unit which controls opening/closing of the main switching unit and the auxiliary switching unit; a first power supply unit, to which power is supplied from both terminals of the main switching unit through a rectifying unit, for supplying a stable voltage to the control unit; a second power supply unit, to which power is supplied from both terminals of the main switching unit through the rectifying unit, for supplying power to the first power supply unit when no power is supplied to the load; a third power supply unit for supplying power to the first power supply unit when power is supplied to the load in a closed state of the main switching unit or the auxiliary switching unit; a voltage detection unit which detects a voltage inputted to the third power supply unit; and a zero-cross detection unit which detects a zero-cross point of a load current, wherein when power is supplied to the load, the control unit causes a rise of a main switching unit drive signal for putting the main switching unit in a conducting state if the voltage detection unit detects that the voltage inputted to the third power supply unit reaches a predetermined threshold within a predetermined standby time limit after the zero-cross detection unit detects the zero-cross point of the load current, and starts supplying the main switching unit drive signal after a predetermined period, that is shorter than half cycle of the load current, after the zero-cross detection unit detects the zero-cross point of the load current, and wherein when power is supplied to the load, the control unit causes a rise of the main switching unit drive signal after the standby time limit is elapsed if the voltage detection unit fails to detect that the voltage inputted to the third power supply unit reaches a predetermined threshold within the standby time limit, and starts supplying the main switching unit drive signal after a predetermined period, that is shorter than half cycle of the load current, after the zero-cross detection unit detects the zero-cross point of the load current. - View Dependent Claims (7, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
8. A two-wire load control device connected in series between an AC power source and a load, comprising:
-
a main switching unit which includes a switch element having a transistor structure, and controls a supply of power to the load; an auxiliary switching unit which includes a switch element having a thyristor structure, and controls the supply of power to the load when the main switching unit is in a non-conducting state; a control unit which controls opening/closing of the main switching unit and the auxiliary switching unit; a first power supply unit, to which power is supplied from both terminals of the main switching unit through a rectifying unit, for supplying a stable voltage to the control unit; a second power supply unit, to which power is supplied from both terminals of the main switching unit through the rectifying unit, for supplying power to the first power supply unit when no power is supplied to the load; a third power supply unit for supplying power to the first power supply unit when power is supplied to the load in a closed state of the main switching unit or the auxiliary switching unit; a voltage detection unit which detects a voltage inputted to the third power supply unit; and a current detection unit which detects a current flowing into the auxiliary switching unit, wherein when power is supplied to the load, the auxiliary switching unit is put in a conducting state if the voltage detection unit detects that the voltage inputted to the third power supply unit reaches a predetermined threshold, and wherein the control unit puts the main switching unit in a conducting state and simultaneously puts the auxiliary switching unit in a non-conducting state if the current detection unit detects that the current flowing into the auxiliary switching unit reaches a predetermined threshold. - View Dependent Claims (9, 10, 11, 12, 13, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48)
-
-
14. A two-wire load control device connected in series between an AC power source and a load, comprising:
-
a main switching unit which includes a switch element having a transistor structure, and controls a supply of power to the load; an auxiliary switching unit which includes a switch element having a thyristor structure, and controls the supply of power to the load when the main switching unit is in a non-conducting state; a control unit which controls opening/closing of the main switching unit and the auxiliary switching unit; a first power supply unit, to which power is supplied from both terminals of the main switching unit through a rectifying unit, for supplying a stable voltage to the control unit; a second power supply unit, to which power is supplied from both terminals of the main switching unit through the rectifying unit, for supplying power to the first power supply unit when no power is supplied to the load; a third power supply unit for supplying power to the first power supply unit when power is supplied to the load in a closed state of the main switching unit or the auxiliary switching unit; a voltage detection unit which detects a voltage inputted to the third power supply unit; and a manipulation unit which is manipulated by a user to adjust a current flowing in the load, wherein the control unit sets a main switching unit conducting time which is counted in order to put the main switching unit in a conducting state every half cycle of the AC power source in response to a manipulation inputted to the manipulation unit, and wherein the control unit puts the main switching unit in a conducting state only while a predetermined period, which is counted from when the voltage detection unit detects that the voltage inputted to the third power supply unit reaches a predetermined threshold, overlaps with the main switching unit conducting time. - View Dependent Claims (15, 28, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49)
-
Specification