An electrical network including a power source, a flyback converter, a microcontroller, a PID controller, a voltage boost converter, a pulse width modulator integrated circuit, and a battery. The power source produces a charge with a voltage ranging from about 0.1V to about 0.8V and a power ranging from about 0.3 mW to about 100 mW. The flyback converter functions in discontinuous current mode. The microcontroller monitors the power source voltage, calculates a voltage response, and outputs a control signal for the voltage. The PID controller is a digital PID controller, an analog PID controller, or a combination thereof. The voltage boost converter utilizes the power source voltage and power to provide higher voltage power to the electrical network. The pulse width modulator integrated circuit sets a duty cycle and frequency for the flyback converter. The battery stores excess charge produced by the power source.

A compound control circuit comprises an input end, a light-load signal processing circuit, a slow response circuit and a fast response circuit. The compound control circuit is mainly used as an additional circuit of a work control chip, so that although the work control chip only has a single overcurrent protection level, a compound function control of fast and slow speed, high and low level current protection and light-load signal stabilization can be generated through the compound control circuit, so as to meet the complex application environment and compatible requirements of the current power supply.

A method of controlling a multi-phase power converter having a plurality of power stage circuits coupled in parallel, can include: obtaining a load current of the multi-phase power converter; enabling corresponding power stage circuits to operate in accordance with the load current, such that a switching frequency is maintained within a predetermined range when the load current changes; and controlling the power stage circuits to operate under different modes in accordance with the load current, such that the switching frequency is maintained within the predetermined range when the load current changes.

Controllers for power converters, power converters and corresponding methods are provided.

A controller of a power converter including a first power stage and a second power stage receives an indication of an output voltage of the power converter, where the indication is measured at the primary side of the power converter. Based on the indication, a control related to an intermediate voltage of the power converter is performed.

A circuit with a metal-oxide semiconductor field-effect transistor and a diode module is applied to a power factor correction circuit, which can effectively reduce the heat generated by the whole system under heavy load, The circuit includes a metal-oxide semiconductor field-effect transistor and a diode module and a load determination unit. The diode module includes a plurality of diodes with a switch. The load determination unit can control the connection/disconnection of each diode in the diode module based on the magnitude of the load current. It can effectively reduce the current generated by each diode due to the load, thereby reducing the heat generation of the overall system. Moreover, due to the contact capacitance effect after the diodes are connected in parallel, the electromagnetic interference (EMI) characteristics of the power factor correction circuit of the system can be further optimized.

The invention relates to a device for activating a control unit in a second electrical network, starting from a first electrical network in a vehicle having an electrified drive train, the first electrical network being galvanically isolated from the second electrical network, the device comprising: a signal generating module for generating a wake-up signal in the first electrical network; a transformer which is designed to transmit the wake-up signal and electrical power from a first transformer winding on the first electrical network to a second transformer winding on the second electrical network, a rectifier circuit in the second electrical network, which circuit is connected to the second transformer winding and is designed to rectify the transmitted wake-up signal, and a switching element in the second electrical network, which element is connected to the rectifier circuit and is designed to activate a control unit (60) when the rectified wake-up signal is present or absent at an input of the switching element (50).

A control method for a synchronous BUCK circuit is disclosed, including: obtaining an input voltage, an output voltage and an output current of the synchronous BUCK circuit; obtaining a current state of the synchronous switch transistor; obtaining a turn-off current threshold when the synchronous switch transistor is in an on state; switching the synchronous switch transistor to an off state when the output current is less than the turn-off current threshold; calculating a duty ratio of a main switch transistor according to the input voltage, the output voltage and the turn-off current threshold; and generating a corresponding driving signal according to the duty ratio, to control the synchronous BUCK circuit.

A metal-oxide semiconductor field-effect transistor with asymmetric parallel die and an implementation method thereof, comprising an inductor, a load recognition control unit and a metal-oxide semiconductor field-effect transistor having a first die, a second die, and a switch. The first die is larger in size than the second die. The inductor can produce a voltage signal when the load changes. The switch is controlled by the load recognition control unit such that different dies are switched on under different load conditions, thereby improving efficiency under light load condition in addition to reducing volume and cost.

An electronic device includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.

An auto calibration method used in switching converters with constant on-time control. The auto calibration method includes: generating a periodical clock signal with a predetermined duty cycle; providing a first voltage and a second voltage to an on-time control circuit to generate an on-time control signal based on the first and second voltage; providing the clock signal and on-time control signal to a logic circuit to generate a switch control signal based on the clock signal and on-time control signal; comparing the duty cycle of the switch control signal with the duty cycle of the clock signal to adjust a calibration code signal; and adjusting circuit parameters of the on-time control circuit in accordance with the calibration code signal.