Abstract: A close loop control system includes a controlled system having a controlled variable and a control variable, a first detecting unit, a second detecting unit, and a feedback control unit. The first and the second detecting units detect the controlled system to output a first and a second feedback values corresponding to the control variable. The feedback control unit controls the controlled system according to the differential value of the first or the second feedback value and a predetermined value to stabilize the controlled variable to the predetermined value. The absolute differential value of the first and the second feedback values determines if detecting units are regular. When the absolute differential value is smaller than an error value, the controlled variable is controlled according to the first feedback value. When the absolute differential value is not smaller than the error value, the controlled variable is fixed to a fixed value.

Abstract: An elliptical exercise apparatus includes two cranks disposed rotatably on a frame and rotatable about a common crank axis, two rails each disposed fixedly on the frame and having a non-circular guide slot, two extension links connected respectively, radially, and slidably to the cranks and mounted with rollers disposed respectively and movably within the guide slots, two connector members disposed on the frame and reciprocatable along a longitudinal direction of the frame, and two foot links each having a first end connected pivotally to the corresponding extension link and a second end connected pivotally to the corresponding connector member. When the rollers move along the rails, the extension links are extendable and retractable relative to the cranks, respectively.

Abstract: An elliptical exercise apparatus includes two cranks disposed rotatably on a frame and rotatable about a common crank axis, two rails each disposed fixedly on the frame and having a non-circular guide slot, two extension links connected respectively, radially, and slidably to the cranks and mounted with rollers disposed respectively and movably within the guide slots, two connector members disposed on the frame and reciprocatable along a longitudinal direction of the frame, and two foot links each having a first end connected pivotally to the corresponding extension link and a second end connected pivotally to the corresponding connector member. When the rollers move along the rails, the extension links are extendable and retractable relative to the cranks, respectively.

Abstract: An active type harmonic suppression apparatus, connected in parallel to a power feeder, supplies a compensation current for injecting into the power feeder such that a utility current of a power source is approached to a sinusoidal wave. The control circuit retrieves a load current, a utility current, an output current of the power converter, a power source voltage and a voltage of the dc power capacitor for calculating and sending a reference signal of compensation voltage to a pulse-width-modulation circuit which generates switching signals for the power converter. Furthermore, the harmonic suppression apparatus can provide a fixed or variable reactive power.

Abstract: A power converter for a hybrid power filter includes a power electronic switch set and a DC capacitor. The power converter permits a power line of a power system to directly connect or connect through the passive power filter to a positive or a negative terminal of the DC capacitor of the power converter for free control of the power electronic switches. Consequently, the power converter has a structural configuration that reduces the number of power electronic switches, which can reduce manufacturing costs.

Abstract: A cache is provided that stores licensing policies and information for components. The cache is available early in the boot cycle, such as during initialization and startup of the operating system, for use by the kernel and early boot components. Kernel and early boot components can then call a kernel application programming interface (API) to query the policy values. The policy values are read from a registry value into memory very early in the boot sequence. Using the kernel cache, the system may be started with proper licensable limits.

Abstract: An active power conditioner, connecting with a load and a power source in parallel, includes a DC power capacitor, a power converter, a high-frequency filter and a control circuit. The control circuit detects the voltage of the DC power capacitor and the current of the power source, thereby performing a closed loop control to stabilize the voltage of the DC power capacitor and performing a feed forward control to generate a driving signal for driving the power converter. The power converter actuates the DC power capacitor to supply a current via the high-frequency filter to reduce the reactive and harmonic components of load current. The load is converted to the linear resistance characteristic, observed from the power source side.

Abstract: A reactive power compensator device includes an AC capacitor and a small-capacity power converter serially connected thereto that avoid the problems of power resonance and harmonic current injection. The reactive power compensator device provides with compensation reactive power current with fixed amplitude or adjustable amplitude. The power converter permits one of power lines of a power system to be connected to either a positive or negative dc terminal of the power electronic switch set through no power electronic switch. Consequently, the number of the power electronic switches is reduced.

Abstract: A plurality of digital licenses correspond to a piece of content, including a base license and at least one add-on license. Each add-on license includes a reference to the base license, and each of the base license and each add-on license sets forth rules specifying how the content may be employed. Each add-on license is identified by way of the reference therein to the base license, and the rules in the base license and in each identified add-on license are aggregated into an aggregated set of rules that is evaluated to determine if such aggregated set of rules allows employing the content in a particular manner.

Abstract: A three-phase three-wire active power filter includes a dc power capacitor, a power converter, a filter inductor set, a reactive power compensating capacitor set, a combined capacitor/resistor filtering set and a control circuit. The dc power capacitor provides with a regulated voltage. The power converter includes a two-arm bridge power converter, and has a pair of ac terminals and a pair of dc terminals. A phase of the three-phase three-wire active power filter, without control of the power electronic switch set, directly connects with any one of the dc terminals. Consequently, the number of power electronic switches employed in the two-arm bridge power converter of the three-phase three-wire active power filter can be reduced.

Abstract: An active type harmonic suppression apparatus, connected in parallel to a power feeder, supplies a compensation current for injecting into the power feeder such that a utility current of a power source is approached to a sinusoidal wave. The control circuit retrieves a load current, a utility current, an output current of the power converter, a power source voltage and a voltage of the dc power capacitor for calculating and sending a reference signal of compensation voltage to a pulse-width-modulation circuit which generates switching signals for the power converter. Furthermore, the harmonic suppression apparatus can provide a fixed or variable reactive power.

Abstract: A three-phase three-wire active power filter includes a dc power capacitor, a power converter, a filter inductor set, a reactive power compensating capacitor set, a combined capacitor/resistor filtering set and a control circuit. The dc power capacitor provides with a regulated voltage. The power converter includes a two-arm bridge power converter, and has a pair of ac terminals and a pair of dc terminals. A phase of the three-phase three-wire active power filter, without control of the power electronic switch set, directly connects with any one of the dc terminals. Consequently, the number of power electronic switches employed in the two-arm bridge power converter of the three-phase three-wire active power filter can be reduced.

Abstract: A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive power compensator is an AC power capacitor adapted to provide the reactive power that reduces capacity of the active type reactive power compensator. The active type reactive power compensator comprises a power converter, a DC capacitor, a high-frequency ripple filter and a controller. The hybrid reactive power compensation device can supply a linearly adjustable reactive power within a predetermined range, and is adapted to supply a current with a nearly sinusoidal waveform. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.

Abstract: A close loop control system includes a controlled system having a controlled variable and a control variable, a first detecting unit, a second detecting unit, and a feedback control unit. The first and the second detecting units detect the controlled system to output a first and a second feedback values corresponding to the control variable. The feedback control unit controls the controlled system according to the differential value of the first or the second feedback value and a predetermined value to stabilize the controlled variable to the predetermined value. The absolute differential value of the first and the second feedback values determines if detecting units are regular. When the absolute differential value is smaller than an error value, the controlled variable is controlled according to the first feedback value. When the absolute differential value is not smaller than the error value, the controlled variable is fixed to a fixed value.

Abstract: A reactive power compensator device includes an AC capacitor and a small-capacity power converter serially connected thereto that avoid the problems of power resonance and harmonic current injection. The reactive power compensator device provides with compensation reactive power current with fixed amplitude or adjustable amplitude. The power converter permits one of power lines of a power system to be connected to either a positive or negative dc terminal of the power electronic switch set through no power electronic switch. Consequently, the number of the power electronic switches is reduced.

Abstract: A power converter for a hybrid power filter includes a power electronic switch set and a DC capacitor. The power converter permits a power line of a power system to directly connect or connect through the passive power filter to a positive or a negative terminal of the DC capacitor of the power converter for free control of the power electronic switches. Consequently, the power converter has a lesser number of the power electronic switches that can reduce the manufacture cost.

Abstract: A software licensing Application Programming Interface (API) that allows software products to use the license management functionality of a common service. A license specifies rights in a software product. The software product calls a consume method on the API in order to consume a right. If the right exists, the service binds the right to the license in which the right is found. The software product enforces the terms of the license by granting, or denying, access to some or all features depending on whether a valid instance of the right is found. Arbitrary data can be associated with a right. The API includes a method to retrieve data from a right that has been previously bound by the consume method.

Abstract: A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive power compensator is an AC power capacitor adapted to provide the reactive power that reduces capacity of the active type reactive power compensator. The active type reactive power compensator is consisted of a power converter, a DC capacitor, a high-frequency ripple filter and a controller. The hybrid reactive power compensation device can supply a linearly adjustable reactive power within a predetermined range, and is adapted to provide with a serial-connected virtual harmonic damping. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.

Abstract: A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive power compensator is an AC power capacitor adapted to provide the reactive power that reduces capacity of the active type reactive power compensator. The active type reactive power compensator is consisted of a power converter, a DC capacitor, a high-frequency ripple filter and a controller. The hybrid reactive power compensation device can supply a linearly adjustable reactive power within a predetermined range, and the supplied current is approximated to be a sinusoidal waveform. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.

Abstract: A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive power compensator is an AC power capacitor adapted to provide the reactive power that reduces capacity of the active type reactive power compensator. The active type reactive power compensator is consisted of a power converter, a DC capacitor, a high-frequency ripple filter and a controller. The hybrid reactive power compensation device can supply a linearly adjustable reactive power within a predetermined range, and is adapted to provide with a serial-connected virtual harmonic damping. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.