A switching regulator control circuit is used in a switching regulator that converts an input voltage into an output voltage by the switching of a switching device, and generates a switching signal for controlling the ON/OFF operation of the switching device. The switching regulator control circuit has a fault detector and a fault protector. The fault detector detects, based on the duty ratio of the switching signal or a variable correlated to it and included in a control signal used to generate the switching signal, a fault state where the duty ratio falls outside the normal modulation range. The fault protector stops the switching of the switching device when the fault detector detects a fault state.

Methods, systems, and apparatus to facilitate a fault triggered diode emulation mode of a transistor. An example apparatus includes a driver to output a control signal to a gate terminal of a transistor of a power converter; and a diode emulation control circuit to, in response to determining a fault corresponding to the transistor, enable the transistor when current flows in a direction from a source terminal of the transistor to a drain terminal of the transistor.

An electric power system includes a direct voltage rail (101), battery elements (102-104) connected with supply-converters (105-107) to the direct voltage rail, and load-converters (111-113) for converting direct voltage of the direct voltage rail into voltages suitable for loads of the electric power system, where the supply-converters and the load-converters are connected with over-current protectors (108-110, 114-116) to the direct voltage rail. The electric power system further includes a capacitor system (117) connected to the direct voltage rail and capable of supplying fault current for switching an over-current protector into a non-conductive state in response to a fault causing a voltage drop at an electrical node connected to the direct voltage rail via the over-current protector. The capacitor system may include one or more high-capacitance electric double layer capacitors. The fault current available from the capacitor system enables a selective protection.

The present provides a secondary power system and a power supply device. The secondary power system is used for supplying power for a load equipment, and comprises: a fuse circuit, a filter circuit, a convertor circuit and an over-voltage and under-voltage protection circuit, wherein, the fuse circuit, the filter circuit, the over-voltage and under-voltage protection circuit and the convertor circuit are sequentially connected in series; the over-voltage and under-voltage protection circuit is configured to cut off power supplied to the convertor circuit when power supplied by the primary power source is an under-voltage or over-voltage; the convertor circuit is configured to convert the primary power source into a secondary power source. The secondary power system, by providing an over-voltage and under-voltage protection circuit, can not only lower the cost of the convertor circuit, but also save the space occupied by the convertor circuit.

Provided are a short-circuit protection method and device for a half-bridge resonance converter. The method includes: a secondary-side current signal of the half-bridge resonance converter is detected, and the detected secondary-side current signal is converted into a corresponding first sampling voltage signal; whether a cycle-by-cycle protection is required in accordance with the first sampling voltage signal is determined; and a driving signal of the half-bridge resonance converter is compulsorily blocked during a preset cycle, if the cycle-by-cycle protection is required. Short-circuit protection may be performed for the half-bridge resonance converter, meanwhile a power density of the half-bridge resonance converter is satisfied.

To provide a switching regulator equipped with an overheat protection circuit small in current consumption. A switching regulator of the present invention is configured to intermittently operate an overheat protection circuit only for a prescribed period based on a signal turning on a switching element, which is outputted from an output control circuit.

A switching regulator control circuit is used in a switching regulator that converts an input voltage into an output voltage by the switching of a switching device, and generates a switching signal for controlling the ON/OFF operation of the switching device. The switching regulator control circuit has a fault detector and a fault protector. The fault detector detects, based on the duty ratio of the switching signal or a variable correlated to it and included in a control signal used to generate the switching signal, a fault state where the duty ratio falls outside the normal modulation range. The fault protector stops the switching of the switching device when the fault detector detects a fault state.

A driver circuit includes three sub-circuits. A first sub-circuit is configured to generate a drive current output by the driver circuit through an output node during first and second regions of operation and includes: a diode coupled to the output node and a first transistor, and a second transistor coupled to the first transistor and a current mirror. A second sub-circuit is configured to generate the drive current during the first and second and a third region of operation and includes: a third transistor coupled to the output node; and a fourth transistor. A third sub-circuit is configured to generate the drive current during the third region of operation and includes: a current source coupled to the current mirror and a buffer; and a fifth transistor coupled to the third transistor and the fourth transistor and configured to receive an output of the buffer.

A circuit includes processing circuitry is sensitive to a regulated voltage at the output node and to a temperature of the circuit. The processing circuit is configured to provide voltage and temperature sensing signals indicative of the regulated voltage at the output node and the temperature of the circuit. The processing circuitry is configured to assume i) a first state, as a result of the voltage sensing signal reaching a voltage threshold, ii) a second state, as a result of the temperature detection signal reaching a temperature threshold, or iii) a third state, as a result of both the voltage and the temperature sensing signals failing to reach the thresholds. The circuit comprises a warning output coupled to a warning signal generation network controlled by the processing circuitry.

An output device outputs a DC voltage applied between a first terminal and a second terminal via the drain and the source of a semiconductor switch. The output device includes a conversion circuit configured to convert the DC voltage into a voltage of a predetermined polarity, irrespective of the polarity of the DC voltage. A booster circuit boosts the voltage that was converted by the conversion circuit and applies the boosted voltage to the gate of the semiconductor switch. The semiconductor switch is on if the voltage of the control terminal with respect to the potential of the first terminal is at least a predetermined voltage.