Abstract: A resonant control device and a resonant control method thereof is provided. The resonant control device includes a feedback controller and a processor. The feedback controller receives a reference voltage and an output voltage and use the reference voltage to perform voltage compensation on the output voltage to generate a control parameter. The processor generates pulse modulation signals according to the control parameter and a switching parameter and uses the pulse modulation signals to drive the resonant converter to regulate the output voltage. The pulse modulation signal has the maximum frequency and the minimum frequency. The pulse modulation signals control the frequency according to the control parameter and the switching parameter when the control parameter is larger than or equal to the switching parameter. Otherwise, the pulse modulation signals control the resonant converter to operate for a fixed period within each cycle of the pulse modulation signal.

Abstract: A direct-current (DC) voltage conversion device includes a resonate driving device, at least two second transformers, at least two second transformers, at least two third transformers, and a rectifying device. The primary sides of the second transformers are connected in series via a first conductive wire and coupled to the resonate driving device via a second conductive wire. The primary sides of the second transformers are connected in series via a third conductive wire and coupled to the resonate driving device via a fourth conductive wire. The primary sides of the third transformers are connected in series via a fifth conductive wire and coupled to the resonate driving device via a sixth conductive wire. The rectifying device is coupled to the secondary sides of the transformers.

Abstract: A power conversion device includes a transformer, a first electrical switch, a second electrical switch, at least one balanced capacitor, at least one voltage-stabilizing capacitor, and a power-providing circuit. The first electrical switch, the second electrical switch, the balanced capacitor, and the voltage-stabilizing capacitor are connected to the primary side of the transformer, and the secondary side of the transformer is connected to the power-providing circuit. The primary side has a first terminal, a second terminal, and a third terminal therebetween. The first electrical switch and the second electrical switch are respectively connected to a high-voltage terminal and a low-voltage terminal, and the voltage-stabilizing capacitor is connected between the two voltage terminals. One end of the balanced capacitor is connected to the third terminal, and another end of the balanced capacitor is connected to the voltage-stabilizing capacitor or the voltage terminals.

Abstract: A wireless system for setting parameters includes at least one electronic device and a parameter-setting device. The electronic device has a first wireless transmission module, a processor, and a desirable device to be set. The processor is electrically connected to the first wireless transmission module and the desirable device. The parameter-setting device has a second wireless transmission module. The parameter-setting device is wirelessly connected to the processor and the desirable device through the first wireless transmission module and the second wireless transmission module. When the desirable device is shut down, the parameter-setting device transmits specification parameters to the first wireless transmission module through the second wireless transmission module to store the specification parameters into the first wireless transmission module.

Abstract: A device for driving light-emitting diodes (LEDs) includes an address transceiver, a processor, and at least one power supply. The address transceiver stores a communication address and receives a Konnex (KNX) protocol signal carrying a driving address. The address transceiver generates a driving signal when the driving address corresponds to the communication address. The processor, electrically connected to the address transceiver, receives the driving signal and generates a power starting signal according to the driving signal. The power supply, electrically connected to the processor and at least one light-emitting diode (LED) module, receives the power starting signal and uses the power starting signal to drive the LED module.

Abstract: A detachable transformer includes a first bobbin, a primary winding, a second bobbin, a secondary winding and a magnetic core set. The magnetic core set peripherally surrounds the first bobbin and the second bobbin and is inserted into them. A top and a bottom of the first bobbin respectively have a first winding recess and an installation recess. The primary winding is arranged in the first winding recess. A side of the installation recess has a first opening connecting with an external space. A top of the second bobbin has a second winding recess. The secondary winding is arranged in the second winding recess. The second bobbin is arranged in the installation recess through the first opening, whereby the first bobbin and the second bobbin form a detachable connection.

Abstract: A synchronization rectification device is connected with a secondary side of a transformer of a power supply and an output capacitor. The synchronization rectification device includes a rectification switch, a voltage-controlled switch module and a rectification controller. The rectification switch is connected between the secondary side and the output capacitor. The voltage-controlled switch module connected with the secondary side has a voltage-division capacitor and receives a secondary voltage generated by the secondary side. The rectification controller is connected with the rectification switch and the voltage-controlled switch module. When the secondary voltage rises to a switching voltage value below a first voltage value, the rectification controller controls the rectification switch to be turned off. After the rectification switch is turned off, the voltage-controlled switch module is turned off, and the voltage-division capacitor receives the secondary voltage.

Abstract: A resonant control device and a resonant control method thereof controls a resonant converter connected with a load. An output voltage is applied across the load. Firstly, a setting voltage is used to perform voltage compensation on the output voltage to generate a control value. Then, pulse modulation signals are generated according to the control value and a switch value, so as to drive the resonant converter to regulate the output voltage. Each pulse modulation signal has the maximum frequency and the minimum frequency. The switch value is equal to the minimum frequency divided by the maximum frequency and less than 0.5. Finally, the process determines whether the control value is less than the switch value. If the answer is yes, PWM signals as the pulse modulation signals are generated, and their frequency is less than the maximum frequency to increase a lower-limit range of the output voltage.