Abstract: A switching power conversion circuit having a two-stage power circuit topology and capable of performing power factor correction is disclosed. In a case that the electrical energy of the switching power conversion circuit needs not to be provided to the system circuit, for example the load and the electronic device fails to be operated, the switching power conversion circuit will be adaptively disabled. As a consequence, the switching power conversion circuit could achieve a power-saving purpose. Moreover, the switching power conversion circuit could be applied to a power supply. When the electronic device is not in use, the power supply has reduced power consumption, thereby achieving a power-saving purpose.

Abstract: An over-voltage and over-temperature detecting circuit includes a voltage-limiting circuit, a temperature sensing circuit, a current source, a first comparing circuit and a second comparing circuit. The equivalent resistance of the temperature sensing circuit varies with the temperature. The current source provides a first current to a detecting terminal, so that a detecting voltage is generated at the detecting terminal. By comparing the magnitude of the detecting voltage with the first reference voltage value, the first comparing circuit generates a corresponding temperature status signal. By comparing the magnitude of the detecting voltage with the second reference voltage value, the second comparing circuit generates a corresponding voltage status signal. If the temperature exceeds the temperature upper limit, the temperature status signal is in an enabling status. If the first voltage exceeds the voltage upper limit, the voltage status signal is in an enabling status.

Abstract: A solar power generating system includes at least one solar panel and at least one junction box. The solar panel includes at least one photovoltaic cell group. The photovoltaic cell group includes plural serially-connected photovoltaic cells. The junction box includes a casing, a first power output terminal, a second power output terminal, and at least one localized maximum power point tracking unit. The casing has a receiving space. The localized maximum power point tracking unit is disposed within the receiving space of the casing. An input side of the localized maximum power point tracking unit is electrically connected with the at least one photovoltaic cell group of the solar panel. An output side of the localized maximum power point tracking unit is electrically connected with the first power output terminal and the second power output terminal.

Abstract: A switching power conversion circuit receives an input voltage and generates an output voltage to a system circuit. The switching power conversion circuit includes a power circuit, a feedback circuit, a control circuit, and an initiation circuit. The power circuit includes a first switch circuit. The feedback circuit generates a feedback signal according to a power-status signal and the output voltage. The first switching circuit is conducted or shut off according to the feedback signal under control of the control circuit, so that the input voltage is converted into the output voltage and the first auxiliary voltage by the power circuit. If the power-status signal is in an off status, a ratio of the feedback signal to the output voltage is equal to a first feedback ratio and the magnitude of the first auxiliary voltage is lower than a normal operating voltage value, so that the control circuit is disabled.

Abstract: A protection circuit including an energy-storage device, a fusible element, and an overvoltage modulation unit is provided. The energy-storage device stores a first energy and supplies the first energy. The fusible element connected in series with the energy-storage device for constituting a branch circuit. The overvoltage modulation unit is connected in parallel with the branch circuit, wherein when the branch circuit begins to have an overvoltage, an absolute value of a modulating current flowing through the overvoltage modulation unit is increased instantaneously, so that a second energy instantaneously released from the energy-storage device is applied to cut off the fusible element.

Abstract: A power supply device includes a mini projecting module, a power converting module and a signal transmission element. The power converting module includes a power input part, a power converting circuit and a power output part. The power converting circuit is used for converting the input voltage into a first output voltage and a second output voltage. The first output voltage and the second output voltage are respectively transmitted to an electronic device and the mini projecting module. The first output voltage is transmitted to the electronic device through the power output part. The signal transmission element is used for connecting the electronic device or an image signal source with the mini projecting module so that an image signal provided by the electronic device or the image signal source is transmitted to the mini projecting module through the signal transmission element.

Abstract: An over-voltage and over-temperature detecting circuit includes a voltage-limiting circuit, a temperature sensing circuit, a current source, a first comparing circuit and a second comparing circuit. The equivalent resistance of the temperature sensing circuit varies with the temperature. The current source provides a first current to a detecting terminal, so that a detecting voltage is generated at the detecting terminal. By comparing the magnitude of the detecting voltage with the first reference voltage value, the first comparing circuit generates a corresponding temperature status signal. By comparing the magnitude of the detecting voltage with the second reference voltage value, the second comparing circuit generates a corresponding voltage status signal. If the temperature exceeds the temperature upper limit, the temperature status signal is in an enabling status. If the first voltage exceeds the voltage upper limit, the voltage status signal is in an enabling status.

Abstract: A switching power conversion circuit receives an input voltage and generates an output voltage to a system circuit. The switching power conversion circuit includes a power circuit, a feedback circuit, a control circuit, and an initiation circuit. The power circuit includes a first switch circuit. The feedback circuit generates a feedback signal according to a power-status signal and the output voltage. The first switching circuit is conducted or shut off according to the feedback signal under control of the control circuit, so that the input voltage is converted into the output voltage and the first auxiliary voltage by the power circuit. If the power-status signal is in an off status, a ratio of the feedback signal to the output voltage is equal to a first feedback ratio and the magnitude of the first auxiliary voltage is lower than a normal operating voltage value, so that the control circuit is disabled.

Abstract: Disclosed is a power adapter having a voltage limiting circuit for limiting an output voltage of the power adapter at a predetermined voltage level when an output current of the power adapter is smaller than a threshold current, and a power limiting circuit for limiting an output power of the power adapter at a predetermined power level when an output current of the power adapter reaches the threshold current, in which the voltage limiting circuit can be configured to receive a current control signal from a load and in response thereto issue a load current regulation signal to a switching control circuit of the power adapter, thereby regulating the output voltage of the power adapter based on the load current regulation signal.

Abstract: A protection circuit including an energy-storage device, a fusible element, and an overvoltage modulation unit is provided. The energy-storage device stores a first energy and supplies the first energy. The fusible element connected in series with the energy-storage device for constituting a branch circuit. The overvoltage modulation unit is connected in parallel with the branch circuit, wherein when the branch circuit begins to have an overvoltage, an absolute value of a modulating current flowing through the overvoltage modulation unit is increased instantaneously, so that a second energy instantaneously released from the energy-storage device is applied to cut off the fusible element.

Abstract: Disclosed is a power adapter having a voltage limiting circuit for limiting an output voltage of the power adapter at a predetermined voltage level when an output current of the power adapter is smaller than a threshold current, and a power limiting circuit for limiting an output power of the power adapter at a predetermined power level when an output current of the power adapter reaches the threshold current, in which the voltage limiting circuit can be configured to receive a current control signal from a load and in response thereto issue a load current regulation signal to a switching control circuit of the power adapter, thereby regulating the output voltage of the power adapter based on the load current regulation signal.

Abstract: The proposed power converter system includes: a main body component having a case, an input terminal, a power converter circuit electrically connected to the input terminal, a plurality of resistors electrically connected to the power converter circuit, and a first connecting port electrically connected to each of the resistors, and a plurality of adaptor units each having an adaptor. Each of the adaptors is employed to let the power converter circuit generate a specific output voltage value and includes: an input connecting port coupled to the first connecting port to let each of the resistors become one of the grounded state, the open-circuited state, and the coupled to the output voltage state, and an output port coupled to the input connecting port for outputting the output voltage.

Abstract: The proposed power converter system includes: a main body component having a case, an input terminal, a power converter circuit electrically connected to the input terminal, a plurality of resistors electrically connected to the power converter circuit, and a first connecting port electrically connected to each of the resistors, and a plurality of adaptor units each having an adaptor. Each of the adaptors is employed to let the power converter circuit generate a specific output voltage value and includes: an input connecting port coupled to the first connecting port to let each of the resistors become one of the grounded state, the open-circuited state, and the coupled to the output voltage state, and an output port coupled to the input connecting port for outputting the output voltage.