摘要:
A power converter controller and methods for its operation are provided that can control a power converter using estimates of the output power of the converter without requiring a connection to the secondary side of the converter transformer. A self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding is also provided. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed.
摘要:
A method and circuit for controlling the delivery of power having a current component to a load having an inductive component, the method comprising selectively switching power to the load with a switch, wherein the switch is caused to operate at the threshold of saturation during a conduction state such that the switch self commutates to its off state when the magnitude of the current through the load is substantially zero. The method and circuit may be used in a number of applications for detecting a current zero crossing and may be applied to circuits such as dimmer circuits.
摘要:
Disclosed is a solid state power controller (10) configured to supply electric power from an AC power supply (14) to at least one load (16A, 16B) via at least one power distribution channel (12A, 12B), the at least one power distribution channel (12A, 12B) comprising a primary solid state switching device (22A, 22B) and a secondary solid state solid state switching device (24A, 24B) connected in series; each of the primary and secondary solid state switching devices (22A, 24A, 22B, 24B) having a first terminal (D), a second terminal (S), and a control terminal (G), the solid state switching device (22A, 24A, 22B, 24B) configured to switch between an OFF operation mode in which the second terminal (S) is electrically disconnected from the first terminal (D), and an ON operation mode in which the second terminal (S) is electrically connected to the first terminal (D), according to a control voltage applied to the control terminal (G); wherein the solid state power controller (10) comprises: - a primary control terminal driver (30) configured to supply a primary control voltage to the control terminal (G) of the primary solid state switching device (22A, 22B) with respect to a reference potential (R); and - a secondary control terminal driver (40A, 40B) configured to supply a secondary control voltage to the control terminal (G) of the secondary solid state switching device (24A, 24B).
摘要:
A power converter controller and methods for its operation are provided that can control a power converter using estimates of the output power of the converter without requiring a connection to the secondary side of the converter transformer. A self-oscillating power converter that uses a Bipolar Junction Transistor (BJT) as a switch by manipulating the current flowing in a control winding is also provided. The controller is able to determine the optimum time to remove a short circuit applied to the control winding, as well as being able to determine the optimum time to pass current through the control winding. The controller can further draw power from the power converter using the control winding. The controller is capable of maintaining the midpoint voltage of the power converter in the case that the converter has more than one switch. The controller further controls entry and exit into a low-power mode in which converter oscillations are suppressed.
摘要:
Device for regulating the electric feeding of a charge (1) through the alternating current, with at least some serially opposed switching elements (3) or a switching network, and a unit for controlling (2) said switching elements (3). The device comprises a comparator (5) of the saturation voltage "V CEsat " of the switching elements (3), associated to an attenuation network (8) in an input terminal, insofar as in the other input terminal there is a voltage generator having the reference "V ref " disposed between the collector and emitter "V ce " corresponding to an "I ce " current equal to zero, in order to determine the moment of null circulation and current due to said switching elements (3) through the fall of "V CEsat " below "V ref ", determining a current zero-crossing signal to the control unit (2).
摘要:
The invention relates to a circuit arrangement for controlling two independent load resistors (2, 3) that can be operated with a rectified alternating current voltage. A control unit is provided for generating control signals for a semiconductor switch (14; 24) via which the load resistors (2, 3) can be controlled. In addition, a phase identification device (6) is provided via which a positive or negative phase of the alternating current voltage can be identified. In addition, the control unit comprises a logic unit (19) that combines the control signals (17, 18), via which the load resistors should be disconnected in a controllable manner, with the output signal (19) of the phase identification device (6). This renders each control signal (17, 18) active in another phase of the alternating current voltage. A device containing the inventive circuit arrangement can be realized with an open bridge rectifier whereby enabling one or the other load resistor to be controlled in a phase-dependent manner.
摘要:
A dimming device is provided which is compatible with an increased number of types of illumination loads. A signal source (910) generates a drive signal (Sd1) according to a dimming level. A discharge part (920) includes a series circuit having a Zener diode (ZD1) and a rectifier element (D9) connected in series. The series circuit enables passage of a reverse current of the Zener diode (ZD1). In the discharge part (920), the series circuit is electrically connected between a control terminal (20) and the signal source (910) to enable the reverse current of the Zener diode (ZD1) to flow from the control terminal (20) to the signal source (910).