摘要:
A control apparatus for a power quality device comprises: a power quality analysis module, for sampling a power supply network to obtain a power quality information, and performing an analysis and computing on the sampling, so as to output an instruction information; N tracking control modules, for receiving respectively the instruction information and tracking the instruction information, so as to output N PWM control signals having a same frequency and constant phase shift therebetween, where N is a positive integer and N≧2, thereby to control the power quality device; wherein the power quality analysis module and the N tracking control modules are operated based on a synchronized signal.
摘要:
Disclosed is a power supply for receiving an input voltage and generating an output voltage and an output current, which includes a power converter for receiving the input voltage and generating an intermediate output voltage, an output protection circuit connected to an output terminal of the power converter and including a plurality of switch circuits connected in parallel with each other. The output protection circuit is configured to limit the flowing direction of the output current by the switching operations of the switch circuits. The power supply further includes a control unit connected to the output protection circuit for issuing a plurality of control signals to the switch circuits, in which at least two of the control signals are set to allow at least two of the switch circuits to be turned off with different timings.
摘要:
Disclosed is a power supply and a power supply system using such power supply. The inventive power supply includes a power converter for converting an input voltage into an intermediate output voltage, an output protection circuit connected to an output terminal of the power converter and an output terminal of the power supply for protecting the power converter by its ON/OFF operations, and a control unit connected to the output protection circuit for controlling the output protection circuit. When an operating frequency of the power converter is higher than a first reference frequency and the intermediate output voltage is higher than a first reference voltage, the control unit outputs a first control signal to a control terminal of the output protection circuit to turn off the output protection circuit.
摘要:
An inverter and an active power filter system have been disclosed in the invention, so that the application range of the inverter under the occasions of different capacitor requirement can be widened, the cost can be decreased, and the efficiency can be improved. The technical scheme is: an auxiliary capacitor module can be added on the traditional inverter structure and connected in parallel selectively with the capacitor in the inverter. In a system without connecting an external auxiliary capacitor module, the value of capacitance can be designed to be smaller to satisfy the application under normal occasions. If the device operates under the occasions having large harmonic current or having large neutral line current, the ripple current on the capacitor will be larger so that large capacitance will be required to satisfy the life requirement, therefore, the problem can be solved by a method of installing an auxiliary capacitor module.
摘要:
The present application discloses a transformer conductive structure, which comprises a primary coiling, a printed circuit board and a secondary coiling unit comprising a plurality of conductive sheets; wherein each conductive sheet comprises an annular body and an output terminal arranged at the edge of the annular body and protruded to the outside; the annular bodies of the conductive sheets and the primary coiling are staggered arrangement together; and the output terminal of the conductive sheet directly clamps on the printed circuit board. The present application further discloses a transformer, which can effectively reduces the output path of the transformer, the AC and DC loss and the volume of the transformer device, so as to increase the power density and efficiency of power supply.
摘要:
An active isolated power supply with multiple outputs is provided. The power supply includes N transformers T1˜Tn connected to output terminals of AC source, the primary circuits of transformers T1˜Tn are connected in parallel with each other, wherein N is a positive integral number equals to or greater than 2, and N switching devices S1˜Sn or N−1 switching devices S1˜Sn−1 connected in series with the primary circuits of transformers T1˜Tn respectively, to restrict the current direction of the primary circuits of transformers T1˜Tn. Herein, N output power supplies isolated with each other are generated on the secondary sides of transformers T1˜Tn. Therefore, flow direction of current in the primary sides of the transformers is fixed by present invention, such that each transformer can accomplish magnetic reset in one operation period, thereby avoiding the occurrence of current circulation between the primary circuits.
摘要:
Provided is a current sensing signal comparing device and current sensing signal comparing method. The invention includes a current sensing circuit for detecting a current signal of a switching circuit and thereby generating a current sensing signal, a control unit for outputting a control signal, and a compensating circuit for compensating the current sensing signal according to the control signal. The compensated current sensing signal is compared with a constant current reference signal in order to issue a constant current control signal. The other aspect of the invention is provided to configure the compensating circuit to compensate the constant current reference signal, such that the current sensing signal is compared with the compensated constant current reference signal in order to issue a constant current control signal.
摘要:
An approach is provided for limiting or eliminating residual energy in a resonant network before restarting a resonant converter including the resonant network. An energy resetting module is configured to the resonant converter for limiting a peak current occurring in a switching circuit of the resonant converter by resetting energy remaining in a resonant circuit of the resonant converter after the resonant converter is turned off.
摘要:
An approach is provided for limiting or eliminating residual energy in a resonant network before restarting a resonant converter including the resonant network. An energy resetting module is configured to the resonant converter for limiting a peak current occurring in a switching circuit of the resonant converter by resetting energy remaining in a resonant circuit of the resonant converter after the resonant converter is turned off.
摘要:
A converter power unit comprises: a heat sink; n power switch modules on the heat sink; a first group of laminated bus bars comprising a first and a second bus bar; a capacitor group comprising m capacitor; a second group of laminated bus bars comprising a third and a fourth bus bar, the first bus bar is connected with the third bus bar, the second bus bar is connected with the fourth bus bar; providing that vertical projection areas projected by an area occupied by the n power switch modules and projected by the capacitor group on a first plane perpendicular to an axial direction of the capacitor group are defined as a first and a second projection areas respectively, the first and the second projection area have an overlapped area. The present application can reduce the stray inductances in the commutating loop of the converter.