Patent
Electronically commutated motor operable directly from AC power network
TLDR
In this article, an electronically commutated motor (10) is adapted to be powered directly by an AC voltage (UAC) source, and comprises a permanent magnet rotor (18), a stator having at least one winding phase (L1, L2, , Ln), a rectifier (38), and an auxiliary circuit (34, 34′) which comprises a switching element (50) controllable with a control voltage (UST) that is lower than the pulsating DC voltage (UB) to be switched.Abstract:
An electronically commutated motor (10) is adapted to be powered directly by an AC voltage (UAC) source, and comprises a permanent-magnet rotor (18), a stator having at least one winding phase (L1, L2, , Ln), a rectifier (38) which generates, from the AC voltage (UAC), a pulsating DC voltage (UB) between a positive lead (30) and a negative lead (32) of a DC link (15) Also present is a bridge circuit (28A, 28B, 28C), connected to that DC link (15) and provided to supply current to the at least one winding phase (L1, L2, , Ln), which comprises a switching element (50) controllable with a control voltage (UST) that is lower than the pulsating DC voltage (UB) to be switched An auxiliary circuit (34, 34′) generates, from the pulsating DC voltage (UB) at the DC link and from the AC voltage (UAC), a control voltage (UST) for driving the switching element (50) that is lower than the pulsating DC voltage by an amount equal to a predetermined value (UΔ) A preferred filter (140) for connection to an AC power grid is described A preferred embodiment of the circuit includes a bridge circuit having a p-channel MOSFET (50) at the positive lead (30) and an n-channel MOSFET (52) at the negative lead (32) of the DC link (15)read more
Citations
More filters
Patent
Power tool powered by power supplies having different rated voltages
John D. Cox,Michael K. Forster,John C. Vanko,Daniel J. White,Bhanuprasad V. Gorti,Matthew J. Velderman,Andrew E. Seman +6 more
TL;DR: In this paper, a brushless motor having a rotor and a stator was used to control a power tool and a motor control circuit including a power switch circuit having a power switches disposed between the power supply interface and the motor, and a controller outputting drive signals to the power switches within each phase of the motor to control the power supplied to the motor from the power supplies.
Patent
Switch array for use in motor control
TL;DR: In this article, a switch array for use in a motor control circuit with a power source, controller and a motor includes a plurality of bidirectional switches positioned between the power source and the motor.
Patent
Control of long-stator linear motor coils of long-stator linear motor stator
TL;DR: In this article, a method and device for controlling the n LLM coils of an LLM stator making it possible to change the polarity of the coil voltage of the NLLM coils more easily and with little circuit complexity was proposed.
Patent
Amplitude AC noise filter with universal IEC connection
TL;DR: In this paper, an AC noise filter designed to filter the small amplitude AC noise of all frequencies by using inline reverse coupled parallel PN semiconductors which offer a high resistance to AC voltages of less than a diode voltage drop.
Patent
Power tool having a brushless motor capable of being powered by AC or DC power supplies
John D. Cox,Michael K. Forster,John C. Vanko,Daniel J. White,Bhanuprasad V. Gorti,Matthew J. Velderman,Andrew E. Seman +6 more
TL;DR: In this article, a brushless motor with a power tool and a motor control circuit is provided, including a rectifier circuit converting the AC power to a rectified voltage signal, a power switch circuit having power switches, and a controller controlling a switching operation of the power switches to regulate the supply of electric power to the motor at a level corresponding to the operating voltage range.
References
More filters
Patent
Electronically commutated motor
TL;DR: In this paper, an analogous circuit with two current limiting members (131, 161) is provided and a circuit in which these functions are realized by the software of a microcontroller so that the measurement of current is no longer necessary.
Patent
Precision switching circuit for analog signals
TL;DR: In this article, a high-speed low-imperceptible switching circuit for video or other high-frequency analog signals is described, where a J-FET is used as the switching element but is controlled by means of a novel circuit which minimizes channel impedance modulation effects.
Patent
Direct current machine with a controllable arrangement for limiting current
TL;DR: In this article, an electronically commutated direct current machine, consisting of a rotor and a stator, has been presented, which can be supplied with power from a direct current source (73, 74) by a full bridge circuit (78).
Patent
Phase-controlled dimmable electronic ballasts for fluorescent lamps with very wide dimming range
TL;DR: In this article, two novel control approaches are proposed to suppress oscillatory effects in the Triac circuit so as to maintain stable operation over a wide firing angle range and a hybrid dimming control technique in the ballast inverter circuit for achieving wide dimming range from 100% to about 3%.
Patent
Electronic power circuit
TL;DR: In this article, a self-conducting power semiconductor is proposed to reduce the forward power losses and switching losses of an electronic power circuit, which reduces the power consumption and energy consumption.