Multi-mode dimmer interfacing including attach state control
First Claim
1. A method wherein a dimmer voltage to a power converter system comprises four states that occur from:
- A. an approximately zero volt crossing of the dimmer voltage of a dimmer until a phase cut, leading edge of the dimmer voltage;
B. an end of state A until a steady state value of a dimmer current has reached a predetermined hold value;
C. an end of state B until energy transferred to a load is sufficient to meet at least one energy transfer parameter; and
D. an end of state C until a beginning of state A;
the method comprising;
for state A, enabling a low impedance path for a dimmer current of the dimmer,wherein the impedance of the low impedance path is sufficiently low to maintain a stable phase angle of the dimmer;
for state B;
enabling control of switch mode power conversion of the dimmer voltage;
sensing a leading edge of a dimmer input voltage; and
after the sensing the leading edge of the dimmer input voltage, actively controlling a decreasing transition of a current through a triac-based dimmer to prevent a triac of the dimmer from prematurely resetting;
for state C, controlling switch mode power conversion to maintain the dimmer current above a threshold; and
for state D, entering an inactive state, wherein during the inactive state the low impedance path and the control of mode power conversion is disabled.
3 Assignments
0 Petitions
Accused Products
Abstract
A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii) attaching a dimmer to a power converter system at the leading edge of a phase-cut, rectified input voltage, (iii), control of switch mode power conversion, and (iv) an inactive state to, for example, reduce the dimmer current while allowing a dimmer to function normally from cycle to cycle of an alternating current (AC) supply voltage. In at least one embodiment, the dimmer functions normally when the dimmer conducts at a correct phase angle indicated by a dimmer input setting and avoids prematurely resetting while conducting. In at least one embodiment, by coordinating functions (i), (ii), (iii), and (iv) the controller controls a power converter system that is compatible with a triac-based dimmer.
87 Citations
14 Claims
-
1. A method wherein a dimmer voltage to a power converter system comprises four states that occur from:
-
A. an approximately zero volt crossing of the dimmer voltage of a dimmer until a phase cut, leading edge of the dimmer voltage; B. an end of state A until a steady state value of a dimmer current has reached a predetermined hold value; C. an end of state B until energy transferred to a load is sufficient to meet at least one energy transfer parameter; and D. an end of state C until a beginning of state A; the method comprising; for state A, enabling a low impedance path for a dimmer current of the dimmer, wherein the impedance of the low impedance path is sufficiently low to maintain a stable phase angle of the dimmer; for state B; enabling control of switch mode power conversion of the dimmer voltage; sensing a leading edge of a dimmer input voltage; and after the sensing the leading edge of the dimmer input voltage, actively controlling a decreasing transition of a current through a triac-based dimmer to prevent a triac of the dimmer from prematurely resetting; for state C, controlling switch mode power conversion to maintain the dimmer current above a threshold; and for state D, entering an inactive state, wherein during the inactive state the low impedance path and the control of mode power conversion is disabled. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus wherein a dimmer voltage to a power converter system comprises four states that occur from:
-
A. an approximately zero volt crossing of the dimmer voltage of a dimmer until a phase cut, leading edge of the dimmer voltage; B. an end of state A until a steady state value of a dimmer current has reached a predetermined hold value; C. an end of state B until energy transferred to a load is sufficient to meet at least one energy transfer parameter; and D. an end of state C until a beginning of state A; the apparatus comprising; a controller configured to; for state A, enable a low impedance path for a dimmer current of the dimmer, wherein the impedance of the low impedance path is sufficiently low to maintain a stable phase angle of the dimmer; for state B; enable control of switch mode power conversion of the dimmer voltage; sense a leading edge of a dimmer input voltage; and after the sensing the leading edge of the dimmer input voltage, actively control a decreasing transition of a current through a triac-based dimmer to prevent a triac of the dimmer from prematurely resetting; for state C, control switch mode power conversion to maintain the dimmer current above a threshold; and for state D, enter an inactive state, wherein during the inactive state the low impedance path and the control of mode power conversion is disabled. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification