Abstract:
An isolated power conversion apparatus includes an isolation transformer and an auto charge pump circuit. The isolation transformer has a primary side and a second side, wherein the primary side is electrically connected to a pulsed power supply, and the secondary side has a first end and a second end; the auto charge pump circuit electrically connects the isolation transformer to a loading to improve power conversion efficiency and suppress output voltage ripples.
Abstract:
A compensation control circuit is provided, which may be connected to a converter to compensate its error. The compensation control circuit may include a compensation control module, a control module and a modulation module. The compensation control module may include a compensation control port, and the compensation control module can receive a compensation database via the compensation control port and then output a compensation signal corresponding to the compensation database. The compensation database can be created by pre-measurement, which may include the compensation signal corresponding to the error that will occur on the converter under a specific input power signal. The control module can output a control signal according to the compensation signal. The modulation module can modulate the control signal into a modulation signal and output the modulation signal to the converter so as to control the output signal of the converter.
Abstract:
A dimmable LED illumination system includes a power converting circuit and a lamp. The power converting circuit is electrically connected to a power source to convert electric power of the power source into a voltage signal. The lamp includes a DC/DC converter and a LED module, wherein the DC/DC converter is electrically connected to the power converting circuit to convert the voltage signal into a corresponding current signal. The LED module is electrically connected to the DC/DC converter to be driven by the current signal to emit light. By adjusting a voltage provided by the power converting circuit, a current provided by the DC/DC converter could be adjusted as well, which changes a luminance of the LED module.
Abstract:
A method of driving LED chips of same power but different rated voltages and currents includes the following steps: set a predetermined power; provide a LED chip which has a rated power accordant to the predetermined power; measure the LED chip to obtain a working current thereof while the LED chip is operated; provides a driving current to the LED chip, and maintain the driving current the same as the working current.
Abstract:
An AC-AC voltage transformation device is provide, which includes: a first diode (D1), its positive electrode connects to one end of a (AC) power source; a second diode (D2), its negative electrode connects to the joint of D1 and the power source; a third diode (D3), its positive electrode connects to the other end of the power source; a fourth diode (D4), its negative electrode connects to the joint of D3 and the power source, and its positive electrode connects to the positive electrode of D2; a transformer (10), its primary side has a first coil (N1) and a second coil (N2), wherein N1 connects to the negative electrode of D1, and N2 connects to the negative electrode of D3, and its secondary side connects to a load; an electrode switch (SW), one end thereof connects to the joint of D2 and D4, and the other end thereof connects to the joint of N1 and N2.
Abstract:
A power conversion device is provided, which includes a first inductor (L1), switch assembly (20), diode (D), first capacitor (C1), second inductor (L2) and a second capacitor (C2). One end of the first capacitor is connected to the positive terminal (12) of a DC power source (300). One end of the switch assembly is connected to the other end of the first inductor, and the other end is connected to the negative terminal (14) of the DC power source. The positive electrode of the diode is connected to the switch assembly. One end of the first capacitor is connected to the negative electrode of the diode. The second inductor is connected in parallel with the first capacitor. The second capacitor is connected in parallel with a load (200), one end of the capacitor is connected to the second inductor, and the other end is connected to the negative terminal.
Abstract:
A power conversion apparatus, which converts power of a DC power supply and provides it to the loading, includes a transformer, an electronic switch, a leakage energy recycling circuit, and a output circuit. The transformer has a primary winding, which receives the power, and a secondary winding, which outputs the converted power. An end of the electronic switch is electrically connected to the primary winding; another end thereof is electrically connected to the DC power supply. The leakage energy recycling circuit is electrically connected to the primary winding, and repeatedly and alternatively outputs power of positive and negative voltage. The circuit receives and stores leakage energy of the transformer, and feedbacks it to the transformer. The output circuit is electrically connected to the secondary winding to receive the converted power and to provide it to the loading.
Abstract:
A method of transmitting signals applied for a loading control system, which includes a phase angle control module and a driving module, wherein the phase angle control module is electrically connected to an input interface. The method includes the following steps: A. switch the input interface from a first status to a second status; B. modify a voltage waveform of an AC power to make the voltage waveform have a delayed conduction angle in half of its wave period; C. check the delayed conduction angle of the voltage waveform; D. transmitting an electric signal to a loading according to the delayed conduction angle.
Abstract:
A switch includes a first switching member and a latch circuit. A first terminal of the first switching member is electrically connected to a power source, while a second terminal thereof is electrically connected to a loading. The latch circuit includes a first transistor and a second transistor which are mutually electrically connected. The first transistor is electrically connected to the first terminal, and the second transistor is electrically connected to the control terminal. By inputting a trigger voltage to the second transistor, the second transistor and the first switching member are conducted, which makes the first transistor become conductive. After the first transistor becoming conductive, the first transistor provides electricity to the second transistor to cause latching effect, and to consequently keep the first switching member conductive.
Abstract:
A power supply apparatus for applying a method of supplying a loading with an electric power within a predetermined range of a default power, which includes a driving unit, a voltage sensing unit, and a feedback control unit. The driving unit receives power from a power source, and supplies the loading with a working voltage and a working current; the voltage sensing unit detects the working voltage; the feedback control unit keeps a plurality of reference voltages, wherein each two neighboring reference voltages are defined to have a voltage section therebetween. The feedback control unit sends a current signal to the driving unit according to the working voltage and a slope parameter of the voltage section which the working voltage falls in, and the driving unit supplies the working current according to the current signal to maintain the electric power in the predetermined range of the default power.