86results about How to "Reduce current noise" patented technology

The invention discloses a timing control system and a method for a non-salient pole permanent magnet synchronous motor. The method comprises the following steps: the electrical angle position theta and the mechanical rotational speed omegam of a motor of a non-salient pole permanent magnet synchronous motor rotor are measured; the difference of a preset target rotational speed omegam* and omegam is obtained; the difference is performed with scale, integration and differential operation to obtain component instruction value uq* of q shaft voltage; voltage vectors ualpha* and ubeta* on a static coordinate system can be obtained by PARK inverse transformation of ud* and uq* by theta, wherein, ud* is zero; according to ualpha* and ubeta* of the voltage vector, a power devicepulse-width signal can be generated by a space vector pulse width modulation (SVPWM) algorithm; according to the power device pulse-width signal, three-phase winding current is generated and is sent to the non-salient pole permanent magnet synchronous motor. The invention can realize speed loop no-current sensor vector control of the non-salient pole permanent magnet synchronous motor and lower hardware cost for timing.

The invention discloses a double-power amplification type drain electrode driving system for an LED lamp with blue rays. The system mainly consists of a partial pressure switch circuit, a control switch circuit connected with the output end of the partial pressure switch circuit, a nonlinear trigger circuit arranged at the output end of the control switch circuit, and a power amplifying circuit arranged at the output end of the nonlinear trigger circuit. The system is characterized in that a light beam excitation type logic amplifying circuit and a logic protection emitter coupling type amplifying circuit are also connected between the partial pressure switch circuit and the power amplifying circuit in series. According to the system, the nonlinear trigger circuit, the power amplifying circuit and the light beam excitation type logic amplifying circuit are combined for use creatively, so that the nonlinear characteristic of the nonlinear trigger circuit can be ensured, the safe and reliable trigger voltage can also be supplied to the power amplifying circuit, the interference of electromagnetic pulses can be obviously reduced, and the stable performance of the power amplifying circuit can be ensured.

The invention discloses a mixed type grid driving system which is mainly composed of a driving chip M, a driving circuit, a same-phase alternating current signal amplifying circuit, a self-locking light exciting circuit, a bootstrapping circuit and a power driving amplifying circuit, wherein the driving circuit is connected with the driving chip M, the same-phase alternating current signal amplifying circuit is connected with the driving chip M, the self-locking light exciting circuit is connected with the same-phase alternating current signal amplifying circuit, the bootstrapping circuit is connected with the self-locking light exciting circuit, and the power driving amplifying circuit is arranged between the self-locking light exciting circuit and the driving chip M. The mixed type grid driving system is characterized in that the mixed type grid driving system is further provided with a light beam exciting logic amplifying circuit and a logic protective emitter-coupled type amplifying circuit, wherein the light beam exciting logic amplifying circuit is connected with the bootstrapping circuit, the self-locking light exciting circuit and the power driving amplifying circuit respectively, and the logic protective emitter-coupled type amplifying circuit is connected between the power driving amplifying circuit and the driving chip M in series. The related functions of the driving chip M are excited automatically by the mixed type grid driving system according to external lighting conditions, a starter does not need to be arranged additionally, and therefore power consumption is extremely low. Meanwhile, the starting time of the mixed type grid driving system is only one fourth of that of a traditional grid driving circuit, and the stating time of the mixed type grid driving system is extremely short.