A voltage regulator circuit is provided in which voltage overshoots are quickly dissipated using a discharge path which is connected to an output of the voltage regulator. Circuitry for controlling the discharge path is provided using internal currents of an error amplifier to provide a space-efficient and power-efficient design with a fast response. Moreover, hysteresis can be provided to avoid toggling between discharge and no discharge, and to avoid undershoot when discharging the output. A digital or analog signal is set which turns the discharge transistor on or off. A current pulldown may be arranged in the discharge path.

A switching power converter with good stability and transient response is presented. There is provided a controller for a switching power converter of the type comprising one or more power switches. The controller contains a pulse width modulation comparator arranged to output a digital control signal to control the power switches of the switching power converter. A first input of the pulse width modulation comparator is derived from an output voltage of the switching power converter via a first feedback path. A second input of the pulse width modulation comparator is derived from the output voltage of the switching power converter via a second feedback path. One of the feedback paths has a signal extractor and a differential amplifier arranged to filter the output voltage and to provide good ground noise rejection.

Provided is a current control apparatus including a first cooler that cools a switch element, a bus bar connected to the switch element, a core penetrated by the bus bar, a magneto-electric transducer, which is inserted into the core in order to detect a value of a current supplied to the switch element, a controller that controls the switch element, a case, and a cover, wherein the core includes an exposed disposal structure in which a part of the core is exposed to the exterior of the case as an exposed portion, and the current control apparatus further includes a divided cooling structure in which the exposed portion is cooled without being affected by the temperature of the first cooler that cools the switch element.

An internal voltage generation circuit may be provided. The internal voltage generation circuit may include a first internal voltage generation circuit configured to provide a reference internal voltage to either an internal voltage control circuit or a node at which an output internal voltage is generated. The internal voltage generation circuit may include a second internal voltage generation circuit configured to change a level of the output internal voltage. The internal voltage generation circuit may include an internal voltage control circuit configured to compare the reference internal voltage with the output internal voltage and control the first and second internal voltage generation circuits to change the level of the output internal voltage according to a comparison.

Described examples include DC to DC converters and systems with switching circuitry formed by four series-connected switches, inductors connected between the ends of the switching circuitry and corresponding output nodes, and with a flying capacitor coupled across interior switches of the switching circuitry and a second capacitor coupled across the ends of the switching circuitry. A control circuit operates the switching circuit to control a voltage signal across the output nodes using a first clock signal and a phase shifted second clock signal to reduce output ripple current and enhance converter efficiency using valley current control. The output inductors are wound on a common core in certain examples.

An example voltage regulator includes an output transistor that includes a source coupled to a first voltage supply node and a drain coupled to an output node. The voltage regulator further includes a first transistor that includes a source coupled to the output node, and a second transistor that includes a source coupled to a gate of the output transistor and a drain coupled to a second voltage supply node. The voltage regulator further includes a resistor coupled between the second voltage supply node and a first node that includes the drain of the first transistor and a gate of the second transistor. The voltage regulator further includes an error amplifier that includes a first input coupled to a reference voltage node, a second input coupled to the output node, and an output coupled to a gate of the first transistor.

A switching converter includes a transistor arrangement having a plurality of n transistors, with n≧2, each including a gate terminal, and a load path between a source and a drain terminal, and at least m, with m≦n and m≧1 of the n transistors having a control terminal. The control terminal of each of the m transistors is configured to receive a control signal that adjusts an activation state of the transistor. The load paths of the plurality of n transistors are connected in parallel to form a load path of the transistor arrangement. A drive circuit is configured to adjust the activation state of the m transistors.

A switching power voltage regulator includes a pulse width modulation (PWM) signal generator, an output circuit and a feedback circuit. The PWM signal generator is configured to generate a PWM signal. The feedback circuit is configured to provide a feedback signal to the output circuit according to an output voltage of the output circuit. The output circuit includes an inductor, a plurality of inverters, and a driver. Each of the inverters includes a first transistor and a second transistor. When the inductor needs to be charged, the driver selectively switches one or more corresponding first transistors on according to the feedback signal.

The present disclosure provides a lighting device including a lighting controller, an LED lamp, and a brightness controlling module. The lighting controller is configured for sending first control signals to the LED lamp and the brightness controlling module. The first control signals include an identity of the LED lamp and instruction information for turning on and off the LED lamp. The brightness controlling module is configured for receiving the first control signals sent by the lighting controller and obtaining a previously-stored telegraph code corresponding to the identity of the LED lamp when successively receiving the first control signals instructing to turn on, off, and on the LED lamp within a predetermined time period. The brightness controlling module is configured to adjust a brightness of the LED lamp according to the telegraph code and send out the telegraph code in a manner by changing the brightness of the LED lamp.

A power circuit includes: first and second switching circuits coupled in parallel between an input terminal and an output terminal; a control signal generator that performs an ON/OFF control of the first and second switching circuits individually and generates a first control signal and a second control signal having different phases; a frequency converter that converts a frequency of the first control signal after converting a frequency of the second control signal; and a phase shifter that shifts the phase of the second control signal when a first interrupt is introduced as the first control signal is turned ON after the frequency converter has converted the frequency of the second control signal.