Abstract: A control method for the parallel-connected power converters includes a control circuit comprising a voltage feedback circuit and a current feed-forward circuit. The voltage feedback circuit, consisting of a voltage regulated control circuit and a waveform control circuit, is used to control the power converter's output voltage with constant amplitude and low total harmonic distortion. By adjusting the gain of waveform control circuit, it can regulate the current distribution among the parallel-connected power converters. The current feed-forward circuit separates the power converter's output current into the fundamental component and the harmonic component, and amplifies them by different gain. The amplified fundamental component acts as a fundamental resistor to suppress the circulating current among the parallel-connected power converters, and the amplified harmonic component acts as a harmonic damper for preventing from high frequency oscillation generated by the L-C filter.

Abstract: A DC/DC boost converter is consisted of an inductor, a power electronic switch, a control circuit, a first diode, a second diode and a capacitor. The power electronic switch is not operated if the input DC voltage is higher than the specified low reference DC voltage and it is regarded as the normal input DC voltage. If the input DC voltage is lower than the specified low reference DC voltage and this condition is regarded as the abnormal input DC voltage, the power electronic switch is controlled by pulse width modulation control and a dc voltage across the capacitor is created. Then, the output DC voltage is the summation of the input DC voltage and the capacitor voltage. Thus, the inventive DC/DC boost converter operates only when the input DC voltage is abnormal, thereby avoid additional power loss in the duration of normal input DC voltage.

Abstract: An active harmonic suppression equipment is consisted of a dc capacitor, a power converter, a serially connected inductor/capacitor set, a C-R-C filter set and a control circuit. The dc capacitor operates as an energy storage device and supplies a dc voltage, and the power converter electrically connected thereto is used to convert the dc voltage into a compensating voltage. The inductor/capacitor set and the C-R-C filter set are commonly converting the compensating voltage into a compensating current injecting into a power feeder in order to suppress harmonic currents generated by nonlinear loads, thereby adjusting an utility current to be approximated as a sine-wave.

Abstract: An power supply apparatus for the input harmonic current suppression, input power factor compensation, and an output voltage regulation and a method thereof is provided. The power supply apparatus electrically connected to a AC power has a first power converter electrically connected in parallel with the AC power for providing a first compensating voltage and controlling the first compensating voltage to reduce harmonic components of an input current so as to cause the input current as a substantial sinusoidal wave and in phase with the input voltage, and a second power converter electrically connected in series with an output end of the power supply apparatus for providing a second compensating voltage in order to maintain the output voltage at a desired level and waveform. The related methods are also discussed.

Abstract: A hybrid switch module comprises an auxiliary thyristor switch turning on/off an AC power capacitor, an electromagnetic switch connected parallel thereto, and a control circuit outputting control signals with time difference thereto. During the turn on process, a control signal turns on the thyristor switch while the voltage across the hybrid switch module at the zero crossing point, and then turns on the electromagnetic switch that minimizes an inrush current on the energized capacitor. The thyristor is disabled as the electromagnetic switch is turned on. During the turn off process, a control signal turns on the thyristor switch, and then the electromagnetic switch is turned off to avoid an electric arc due to the voltage across the electromagnetic switch. The driving signal of the thyristor switch is disabled after the electromagnetic switch is completely turned off, and the thyristor switch is turned off while current passing through is at the zero crossing point.

Abstract: An active harmonic suppression equipment is consisted of a dc capacitor, a power converter, a serially connected inductor/capacitor set, a C-R-C filter set and a control circuit. The dc capacitor operates as an energy storage device and supplies a dc voltage, and the power converter electrically connected thereto is used to convert the dc voltage into a compensating voltage. The inductor/capacitor set and the C-R-C filter set are commonly converting the compensating voltage into a compensating current injecting into a power feeder in order to suppress harmonic currents generated by nonlinear loads, thereby adjusting an utility current to be approximated as a sine-wave.

Abstract: A seat assembly for a bicycle has a base and an enveloped coat. The base is attached to a seat post of the bicycle and has a flange extending downward around the periphery of the base. The enveloped coat is attached to the top of the base and has a skirt surrounding the flange on the base. With such a seat assembly, the enveloped coat can provide a good and adjustable comfort effect to the bicycle rider.

Abstract: An power supply apparatus for the input harmonic current suppression, input power factor compensation, and an output voltage regulation and a method thereof is provided. The power supply apparatus electrically connected to a AC power has a first power converter electrically connected in parallel with the AC power for providing a first compensating voltage and controlling the first compensating voltage to reduce harmonic components of an input current so as to cause the input current as a substantial sinusoidal wave and in phase with the input voltage, and a second power converter electrically connected in series with an output end of the power supply apparatus for providing a second compensating voltage in order to maintain the output voltage at a desired level and waveform. The related methods are also discussed.

Abstract: A brake wire connecting device for a stunt bike has an upper shell and a lower shell threadingly connected together to form a housing. A connector disposed inside the housing has two branch wires attached on the bottom portion of the connector and each of the branch wires extends out of the housing through two stepped bores defined inside the lower shell. A main wire has a first end mounted with a stub and a second end mounted with a stopper. The second end extends into the upper shell and is pivotally received in a slot defined in the connector. The upper shell and the lower shell are detachable which allows inspection and maintenance inside the housing, and also the main wire pivotally received is detachable from the connector such that replacing the main wire and the branch wires is possible.

Abstract: The present invention relates to a bicycle wheel hub with strengthening mechanism which includes a regulating spindle connected at the front and rear forks of the shaft of the wheel hub. Based on the opening or closed end of he fork, the shaft is adjusted from the original position to the appropriate position. Accordingly, the engagement among the chainwheel, the freewheel and the drive chain is slightly adjusted to a better condition. Besides, both ends of the shaft or one end thereof near the freewheel is able to be larger than the diameter of portion receiving the bearing by means of the adjustment of the screw joint so that the supporting strength is much improved.

Abstract: A brake wire connecting device for a stunt bike has an upper shell and a lower shell threadingly connected together to form a housing. A connector disposed inside the housing has two branch wires attached on the bottom portion of the connector and each of the branch wires extends out of the housing through two stepped bores defined inside the lower shell. A main wire has a first end mounted with a stub and a second end mounted with a stopper. The second end extends into the upper shell and is pivotally received in a slot defined in the connector. The upper shell and the lower shell are detachable which allows inspection and maintenance inside the housing, and also the main wire pivotally received is detachable from the connector such that replacing the main wire and the branch wires is possible.

Abstract: The brake cable positioning assembly in accordance with the present invention contains a mounting element for connecting the handlebar clamp with the fork shaft. The mounting element has a lug inserted into the slit extending between the inner periphery of the bore for clamping the fork shaft and the edge of the handlebar clamp. The mounting element further has a hollow sleeve to receive the brake cable fitting. With the assembly disclosed, the brake cable can travel to the inner swivel connector through the slit without penetrating the shank of the handlebar.

Abstract: A seat assembly includes a seat having a first end portion with a first tube extending from an underside thereof and a second end portion with two second tubes each integrally extending from an underside thereof. A supporting post defines an elongate slot and includes a first end portion with a first post extending upwardly and fixedly received in the first tube and a second forked end portion with two second posts each extending upwardly and each fixedly received in a corresponding one of the two second tubes. A clamping sleeve is securely fitted on the supporting post and includes an inner wall formed with an elongate rib slidably received in the elongate slot.

Abstract: A axle extension assembly is rotatably mounted to an axle of a wheel hub and includes a base member mounted to the axle with a nut threadedly engaged to the axle, a ring member rotatably mounted to the base member and a tube fixedly connected to the base member. The base member has an outer threaded periphery defined in a first end thereof so as to threadedly connect the tube and a protrusion portion extending radially and outwardly from a second end of the base member. A plain section is defined between the outer threaded periphery and the protrusion portion so that the ring member is rotatably mounted thereon.

Abstract: An elevator control data intercommunication programmer including a main board equipped with master and slave CPUs for controlling the operation of the elevator, EEPROMs for providing operation data to the CPUs, a DSP for controlling vector operation of the elevator's motor, and a data communication port for data communication with an external microprocessor unit. Through the data communication port, data can be programmed in the EEPROMs, so that the elevator operation data (parameters) in the memory of a failed CPU can be copied to another CPU for replacement.

Abstract: A coupling device includes a frame with a first flange extending from a top end thereof and a second flange extending from a lower end of the frame, a first bolt threadedly extending through the first flange with a passage defined longitudinally in the first bolt for a first brake cable extending therethrough, a connecting block composed of a first part and a second part and being disposed between the first flange and the second flange, the first part and the second part each having three recesses defined therein, each of the first part and the second part having three notches defined therein for respectively communicating with the recess corresponding thereto such that the first brake cable and two second brake cables have their heads respectively received in the three recesses.

Abstract: A swivel mechanism for a bicycle includes a base fixedly mounted around a head tube of the bicycle. An annular sleeve is rotatably mounted around the base. A swivel ring is rotatably mounted between the upperside of the base and an underside of the annular sleeve. A cap is securely mounted around an upper end of a steerer tube of the bicycle. An upper connector has at least one first brake cable fixedly mounted on an outer periphery of the cap. A first wire is slidably mounted in the first brake cable and has a lower end fixedly mounted on an outer periphery of the annular sleeve. A lower connector has at least one second brake cable fixedly mounted on an outer periphery of the base. A second wire is slidably mounted in the second brake cable and has an upper end fixedly mounted on an outer periphery of the swivel ring.

Abstract: A brake handle includes a brake body, a brake lever and a rotatable disk. Wherein a semi-circular slot is positioned within the brake body and the brake lever, respectively. The rotatable disk is disposed between the brake body and brake lever. Wherein the rotatable disk can be partially inserted into the slot of the brake body and can be further partially inserted into the slot of the brake lever so the brake body and the brake lever can be pivotally locked to each other. The rotatable disk comprises a groove defined in a periphery of the rotatable for receiving a brake cable and an opening defined in one side of the rotatable disk for receiving a brake cable nipple. The brake cable is connected to the brake via the brake body.