Abstract: A power stage for light emitting diode (LED)-based light bulbs may include a bipolar junction transistor (BJT). The base of BJT switch may be biased externally and the operation of the BJT may be through a single pin to the emitter of the BJT. A controller integrated circuit (IC) may control the power stage through the main BJT's emitter pin in an emitter-controlled BJT-based power stage. The emitter-controlled BJT-based power stage may replace the conventional buck-boost power stage topology. For example, the controller may activate and deactivate a switch coupling the BJT's emitter to ground. A power supply for the controller IC may be charged from a reverse recovery of charge from the BJT, and the reverse recovery controlled by the controller IC.

Abstract: Circuits and related methods for energy efficient battery supplied switching DC-to-DC regulators are disclosed. When entering a power-down state the energy in an output capacitor is harvested and charged back to the battery. This is achieved by ramping-down a reference voltage after a power-down sequence is initiated. The output voltage of the regulator is ramped-down accordingly. At the end of the power down sequence the output voltage of the regulator is down to 0V. The disclosure is especially important for regulators, which frequently are started up and switched down.

Abstract: Systems and methods are disclosed to provide a process independent circuit for measuring output current of low drop out (LDO) regulators as well as buck regulators. The system can also measure the on resistance (RDSon) of the buck power transistors.

Abstract: A dynamic voltage response network for a switching regulator with droop control providing a droop control signal includes a voltage identification setting network, a pass and hold system, and a reset network. The voltage identification setting network initiates a hold condition and adjusts an output voltage reference in response to a change in a voltage identification input. The pass and hold system passes the droop control signal during a pass condition and holds the droop control signal during the hold condition. The reset network resets the pass and hold system to the pass condition in response to a reset signal. The reset signal may be provided in response to a variety of conditions, such as load transients, proximity between the developed droop control signal and the held droop control signal, timeout after the output voltage reference is adjusted, among other reset conditions.

Abstract: A voltage regulator for providing power to a system includes feedforward circuitry receiving a signal from the system indicating the current needed by the system, and the feedforward circuitry causes the voltage regulator to change the voltage regulator output current in response to the signal from the system.

Abstract: A method includes receiving, at a voltage regulator, an activity adjustment signal from a digital circuit. The method also includes controlling one or more variable impedance elements of the voltage regulator to modify an output voltage provided to the digital circuit. The output voltage is based at least in part on the activity adjustment signal.

Abstract: A power supply system to provide power for a central processing unit (CPU) includes a bridge circuit, a pulse width modulation (PWM) controller and a pulse adjusting driver circuit. The bridge circuit detects a work state of the PWM controller to obtain a feedback signal output from the PWM controller, and provides the feedback signal to the CPU. The CPU outputs a control signal to the bridge circuit according to a work state of the CPU and the feedback signal, and the bridge circuit outputs a PWM signal to the pulse adjusting driver circuit according to the control signal. The pulse adjusting driver circuit receives a first driving signal provided by an external circuit, and adjusts the first driving signal according to the PWM signal to generate at least one second driving signal to drive the CPU.

Abstract: An integrated circuit is operable for implementing any of multiple switched mode or linear power control topologies. The integrated circuit includes a control unit, and functional blocks each of which includes circuitry. The control unit is operable selectively to enable particular ones of the functional blocks in response to an input signal indicative of a particular one of the switched mode or linear mode power control topologies.

Abstract: A DC-DC converter includes a current control stage configured to provide a threshold based on an output voltage, an input voltage, and a reference voltage for the DC-DC converter. An off time control can be configured to receive the threshold and control an off time for the DC-DC converter based on the threshold such that the off time is inversely proportional to the peak current generated by the DC-DC converter.

Abstract: The invention relates to a control device (1) employed in a switched electrical power supply system to control a DC/DC converter of said switched electrical power supply system, said control device comprising a first input terminal (A) and a second input terminal (B), a first transistor (T1) connected via its source to the second input terminal (B) and a second transistor (T2) furnished with a gate (G) and connected via its drain (D) to the first input terminal (A), and via its source (S) to the first transistor (T1), the control device comprising a control assembly connected to the gate (G) of the second transistor (T2) and to the second input terminal (B) and comprising a capacitor (Ca) and a first Zener diode (Dz1) connected in series to said capacitor (Ca) and a second Zener diode (Dz2) connected between the gate (G) and the source (S) of the second transistor (T2).

Abstract: A circuit for a semiconductor switching element including a transformer. One embodiment provides a first voltage supply circuit having a first oscillator. A first transformer is connected downstream of the first oscillator. A first accumulation circuit for providing a first supply voltage is connected downstream of the first transformer. A driver circuit having input terminals for feeding in the first supply voltage and having output terminals for providing a drive voltage for the semiconductor switching element, designed to generate the drive voltage for the semiconductor switching element at least from the first supply voltage.

Abstract: An object is to reduce power consumption of a semiconductor device including a DC-DC converter circuit. The semiconductor device includes a DC-DC converter circuit and a microprocessor. The DC-DC converter circuit includes a conversion circuit including an inductor and a transistor, and a control circuit including a comparison circuit and a logic circuit. A hysteresis comparator is used as the comparison circuit. In the control circuit, the comparison circuit compares an output signal of the conversion circuit with a first reference potential or a second reference potential, and the logic circuit performs arithmetic operation between an output signal of the comparison circuit and a clock signal of the microprocessor. In the conversion circuit, the transistor controls current flowing through the inductor in accordance with an output signal of the logic circuit, and the output signal of the conversion circuit is generated in accordance with the current flowing through the inductor.

Abstract: A method includes, in a mobile communication terminal that is powered by a DC-DC converter and is operated by a user in accordance with multiple possible usage scenarios, determining a usage scenario according to which the terminal currently operates. One or more parameters of operation for the DC-DC converter are derived from the usage scenario. The DC-DC converter is configured to supply electrical power to the terminal using the derived parameters of operation.

Abstract: A method and apparatus for providing intermittent or interruptible power to an electronic device. The circuit may provide power upon user initiation and interrupt that power in response to a user command, fault state, period of inactivity and so forth. As one example, interruptible power may be initially provided to activate or “power up” an electronic device and constant power provided after the initial activation. The initial powering up of the device may be facilitated by closing two contacts. The circuit may continue to provide power after the button is released through a monitoring and/or feedback mechanism.

Abstract: A voltage converter includes a power switch having respective charging and discharging control terminals, and an output terminal coupled to a series connected inductor and capacitor. The voltage converter also includes a charging switch coupled to the charging control terminal of the power switch, a discharging switch coupled to the discharging control terminal of the power switch, and a feedback circuit coupling the power switch, charging switch and discharging switch to a node at which the capacitor and inductor are connected. During a charging phase, the charging switch couples the capacitor to the charging control terminal of the power switch, and during a discharging phase, the discharging switch couples the capacitor to the discharging control terminal of the power switch.

Abstract: A method, apparatus, and device provide for the detection of insufficient supplied power supplied to a device. A current multiplier of the device, operable as a voltage regulator, is coupled to the power source, receives a clock signal, and generates a control signal. A digital counter, clocked by the clock signal and reset by the control signal, generates an overflow output in response to an overflow condition of the digital counter that indicates that the current sourcing capability of the power source has fallen below a current threshold of the device. A compensatory response by the device in response to the detection of insufficient supplied power may be provided as well.

Abstract: The invention provides a system and a device for reducing standby power consumption. The system for reducing standby power consumption, comprises a power regulator, a power detecting circuit and a HIC module, and the HIC module is controlled by a MCU to efficiently reduce standby power consumption.

Abstract: A power supply controller includes: a controlling section that, upon determination that no anomaly has occurred, causes a semiconductor switch to execute turning on and, upon determination that the anomaly has occurred, causes the semiconductor switch to maintain an off state; a monitoring section that monitors which condition the controlling section is in, the condition being normal or anormal; and a switching section that, upon monitoring result by the monitoring section indicating the normal condition, causes turning on and off of the semiconductor switch by the controlling section and, upon the monitoring result indicating the anormal condition, causes turning on and off of the semiconductor switch with an external on-off command signals.

Abstract: An electric power supply apparatus includes a choke coil, a switching element, a resonance circuit and a compensation circuit. The parasitic capacitance of the switching element is larger than a predetermined capacitance needed for realizing class E zero-voltage switching. The compensation circuit is connected in parallel with the switching element. The compensation circuit includes a coil and a capacitor, and has inductive impedance.

Abstract: A switcher system or circuit and corresponding methods provide dynamic voltage scaling. One embodiment of an apparatus includes: a switcher controller configured to monitor a signal from a processor for a first state, determine a time that the signal is in the first state, and provide an adjustment signal based on the time, and a power supply coupled to the adjustment signal and configured to provide a variable supply voltage to the processor core, the variable supply voltage controlled by the adjustment signal after the determining a time.

Abstract: Generally, described herein are embodiments of control schemes for sensor-less operation and detection of CCM and DCM in a switching power converter. In one aspect, embodiments of a controller are described that utilize dual control loops and do not require sensing the inductor current or any current in the converter which eliminates or reduces the challenges and problems associated with current sensing. Advantages of embodiments of methods described herein become more significant when used in ultra high switching frequency converters since embodiments of the controller result in eliminating the need for high-speed low-noise current sensing circuitries, when used in on-chip integrated power converters where sensing accuracy may be a more significant issue compared to on-board power converters, and in power converters with paralleled modules since embodiments of the controller eliminate sensing circuitries in each of the modules.

Abstract: A device of inductance detection, which includes: a controller, a current pulse generator, and a detector. The controller generates a control signal and an enable signal to the switching regulator according to a judge signal. The switching regulator then generates an output voltage. The current pulse generator is coupled to the controller and generates a current pulse signal to the object according to the control signal. The detector is coupled to the object and the current pulse generator, and is used to detect a reflective signal responded by the object after the object receives the current pulse signal. The detector then generates a judge signal according to the reflective signal.

Abstract: A two-wire transmitter starter circuit is configured to stably supply power at the time of start-up. The two-wire transmitter starter circuit includes a starter current generation circuit. The starter current generation circuit is connected in parallel with a current conversion unit configured to convert a detection signal of a sensor to a predetermined DC current. The starter current generation circuit includes a first series circuit where a first resistor and a shunt regulator are connected in series, and a second series circuit where a switching element and a second resistor are connected in series. The shunt regulator includes a first control terminal connected to a connection point of the switching element and the second resistor. The switching element includes a second control terminal connected to a connection point of the first resistor and the shunt regulator.

Abstract: A protection switching system in a power supply distribution system, comprises at least one protection switch (25) comprising a controllable semiconductor arranged to conduct current through the power supply line in a normal mode, a control unit (27) arranged to place the at least one protection switch in a test mode in which the current is reduced compared to the normal mode, registration means (28, 29) for registering a test mode value of at least one electrical characteristic in the power supply line that will be affected when the test mode is applied, a monitoring unit (30; 47) arranged to evaluate the at least one electrical characteristic and determine, based on the evaluation, whether or not an action should be taken. If a malfunction is detected an alarm is issued to indicate to service personnel that the protection switch should be replaced.

Abstract: DC-DC converters adapted to provide two or more DC output voltages. More particularly, a multi-state or mode DC-DC converter circuit comprising first and second controllable switches configured for unidirectional conduction of charging current.

Abstract: A boost type power converting apparatus is disclosed. The boost type power converting apparatus includes a boost type power converting circuit and a protection circuit. The boost type power converting circuit receives an input voltage and generates an output signal at an output terminal thereof according to the input voltage, and outputs the output signal to a load. The protection circuit is coupled between the boost type power converting circuit and the load in serial to form an electrical loop, and turns on or off the electrical loop according to the output signal.

Abstract: In one embodiment, the present invention includes a primary voltage regulator to couple a regulated voltage to a processor via a supply line. This regulator includes a multi-phase controller to provide the regulated voltage in multiple phases and to provide a maximum current output sufficient to meet a thermal design power (TDP) of the processor. In addition, an auxiliary voltage regulator may be configured to provide an excess current to the processor via the supply line for a time limited duration, e.g., based on the supply line state. Other embodiments are described and claimed.

Abstract: Disclosed is a buck converter for converting a high voltage at the input of the buck converter to a low voltage at the output of the buck converter. The buck converter includes a control circuitry configured to control a duty cycle of a control switch, the control switch being interposed between the input and the output of the buck converter. A synchronous switch is interposed between the output and ground. The control switch and the synchronous switch comprise depletion-mode III-nitride transistors. In one embodiment, at least one of the control switch and the synchronous switches comprises a depletion-mode GaN HEMT. The buck converter further includes protection circuitry configured to disable current conduction through the control switch while the control circuitry is not powered up.

Abstract: Embodiments of the present invention provide a power supply unit capable of achieving noise reduction while maintaining efficiency under the light load state. A FET driver controls switching elements in either one of a Pulse Width Modulation (PWM) mode, an intermittent mode having a lower operating frequency than that in the PWM mode, and a noise-free mode having a higher operating frequency than an audible frequency range. The FET driver operates first in the intermittent mode under the light load state. A microphone collects noise generated from the surroundings of a power supply unit. When the level of an audio signal collected by the microphone exceeds a predetermined level, the FET driver transitions from the intermittent mode to the noise-free mode. In accordance with such an embodiment, the FET driver operates in the noise-free mode only when noise is actually generated.

Abstract: A switching power supply unit of a non-insulated, synchronous rectification type converts a voltage input to an input terminal into a predetermined voltage and outputs the voltage. The unit includes an inductor, a plurality of output switching elements, a plurality of rectifying switching elements, a switching element control circuit, a switching regulator integrated circuit, and a plurality of buffer circuits. The output switching elements, the rectifying switching elements, the switching element control circuit and the buffer circuits are integrated on the switching regulator integrated circuit.

Abstract: A battery-powered load control device (e.g., a motorized window treatment) is able to supply a pulse-width modulated current to an electrical load (e.g., a motor) while conducting a substantially DC battery current from a battery powering the motorized window treatment. The motorized window treatment includes a motor drive circuit for driving the motor with a pulse-width modulated signal to adjust the rotational speed of the motor, such that the motor conducts the pulse-with modulated current. The motorized window treatment also has an input circuit coupled between the battery and the H-bridge drive circuit. The input circuit has an output for conducting the pulse-width modulated load current, and conducts the substantially DC battery current from the battery. The input circuit may comprise, for example, a passive filter circuit (such as an inductor-capacitor filter) or an active circuit (such as a power converter).

Abstract: A switching power supply circuit comprises: a differential amplification stage for outputting an error signal representing a difference voltage between a preset reference voltage and a voltage based on an output voltage; an ON-time generation circuit for defining a period of time during which a main switching element is kept ON; a flip-flop circuit which is set by a set signal based on the error signal and reset by a reset signal being an output of the ON-time generation circuit; current information means for detecting current information representing a current flowing to a subordinate switching element; current information detecting means for supplying a current information detecting signal, which makes an adjustment based on the current information so as to delay the timing of the rise of the set signal, to the output side or the interior of the differential amplification stage; and current information holding means for holding the current information detected by the current information means at a moment wh

Abstract: A buck converter includes a first MOSFET and a second MOSFET connected in series, a PWM module coupled to gates of the first MOSFET and the second MOSFET, and a control unit being coupled to the input current acquired unit, the input voltage acquired unit, the output current acquired unit, the output voltage acquired unit and the PWM module respectively, wherein the control unit controls a switch frequency of the PWM module and acquires the input current, the input voltage, the output current and the output voltage from the input current acquired unit, the input voltage acquired unit, the output current acquired unit and the output voltage acquired unit respectively.

Abstract: A reactor 1A includes a single coil 2 formed by spirally winding a wire 2w and a magnetic core 3 that is disposed inside and outside the coil 2 and forms a closed magnetic circuit. The magnetic core 3 includes an inner core portion 31 disposed inside the coil 2 and an outer core portion 32 disposed so as to cover the outer periphery of the coil 2. The outer core portion 32 is formed of a composite material containing a magnetic powder and a resin. In a section of this composite material, the maximum bubble diameter is 300 ?m or less. In the reactor 1A, the outer core portion 32 has a maximum bubble diameter of 300 ?m or less and, as a result, the loss is low and magnetic characteristics are less likely to be decreased.

Abstract: A power supply has a single stage converter for performing power factor correction to reduce high-frequency harmonics in the input current and performs resonant conversion to achieve zero-voltage switching or zero-current switching for power conversion. The inventive single stage converter includes a switching circuit, a resonant circuit, a power control circuit, and a square wave generator. The switching circuit includes at least one switch and the resonant circuit includes a LLC resonant tank. The power control circuit includes a proportional differential circuit such as a power amplifier configured in a negative feedback topology, and the square wave generator is configured to generate driving signals based on the frequency modulation control signal generated by the comparison of the sensed input current and a user-defined power level input, thereby allowing the square wave generator to regulate the switching operation of the switching circuit.

Abstract: A method, system and device for discharging power or validating protective elements of a power source to ensure proper functioning of a tool at various temperatures. The power source communicates with a switch using handshake signals to establish a scheme for power distribution depending on the temperature of the power source. The power source can discharge power at a normal start-up rate or a slower start-up rate depending on the temperature of the power source. Handshake signals can also be used to validate protective elements, where the protective elements respond to wake-up signals with respective handshake signals indicating that the protective elements are functioning property.

Abstract: A switching frequency setting unit sets switching frequency of a switching element, based on both the temperature of a cooling medium which cools a DC-DC converter and the temperature of a switching element of the DC-DC converter. A switching controller controls the voltage conversion ratio of the DC-DC converter by controlling switching operation of the switching element at the set switching frequency.

Abstract: Methods and systems for power conversion are disclosed, including receiving at least one interrupt indicative of a transient power condition of the power converter and switching the processor to operate in a second mode from a first mode responsive to the interrupt. The switching enables the processor to allocate greater resources to process a power output parameter of the power converter operating in the transient power condition compared to resources allocated by the processor operating in the first mode to process the power output parameter.

Abstract: A modulation method and modulator for an envelope tracking power supply. An output of a multi-level switching regulator (202) in the envelope tracking power supply modulator is in parallel connection with an output of a linear regulator (201) via an inductor (203) and supplies power to a load.

Abstract: An electronic device includes a DC-DC converter for voltage conversion in a slave mode an in a master mode and including a phase locked loop. The phase locked loop comprises a controlled oscillator, a filter having an integration capacitor coupled to a control input of the controlled oscillator, a charge pump, and a phase frequency detector. In the slave mode, the controlled oscillator, the filter, the charge pump and the phase frequency detector are coupled to operate as the phase locked loop. There is a comparator coupled with an input to a control input of the controlled oscillator and with an output to the charge pump. In the master mode, the comparator is configured to control the charge pump in response to a control signal at the control input of the controlled oscillator when the phase frequency detector is switched off so as to perform a modulation of the control signal at the control input of the controlled oscillator by charging and discharging the integration capacitor.

Abstract: A method and system is disclosed for powering device sub-circuitry of an electronic device. The sub-circuitry may be used to provide control signals to a direct current switcher on a main system board, thus eliminating passive circuitry typically associated with the sub-circuitry. Furthermore, by actively generating the control signals for the direct current switcher, explicit timing control circuitry is not required to synchronize the transmitted power to the sub-circuitry.

Abstract: A DC-DC converter includes a main reactor interposed in a main energization path extending from a DC voltage input terminal to a DC voltage output terminal, a first main switching element interposed into the main energization path so as to be on-off controlled so that current flowing across the main reactor is intermitted, a second main switching element forming a discharge loop discharging electrical energy stored in the main reactor to the DC voltage output terminal side, an auxiliary reactor interposed between the first main switching element and the main reactor in the main energization path, an auxiliary switching element discharging electrical energy via the main reactor to the DC voltage output terminal side, the electrical energy being stored in the auxiliary and main reactors, and diodes connected in reverse parallel with the first and second main switching elements and the auxiliary switching elements respectively.

Abstract: In a power circuit for reducing standby power consumption, a power supply is defined to include a primary power system and a stationary power system. The stationary power system outputs a stationary power after obtaining an input power. A control unit controls ON/OFF of the primary power system, obtains the stationary power as the required power, and receives a PS ON/OFF signal for triggering the control unit, so that the control unit controls the primary power system to supply a primary output power. The power supply includes a switch unit having two ends connected to a power circuit for outputting the stationary power and a virtual load respectively. The PS ON/OFF signal is provided for controlling the switch unit. If the switch unit does not receive the PS ON/OFF signal, it is OFF in a standby mode to avoid unnecessary power consumption of the virtual load.

Abstract: A display includes a power supply system using a power controller to switch a power switch to control power delivery, and an image scalar receiving a supply voltage and a supply current from the power supply system. An apparatus and method are proposed to determine a control signal in a standby mode by monitoring the supply voltage or the supply current, to wake up or turn off the power controller to reduce the switching times of the power switch in the standby mode, thereby reducing the switching loss of the power switch and the standby power consumption of the display.

Abstract: An output module for providing power to a device by using power from a source includes an inlet port, an outlet port, a power conversion circuit configured to receive power from the source through the inlet port and supply converted power to the device through the outlet port, and a control circuit coupled to the power conversion circuit and configured to determine a power requirement of the device and to operate the power conversion circuit to produce converted power having a parameter based upon the power requirement. Preferably, the power requirement is a charging requirement of a battery of the device.

Abstract: Consistent with an example embodiment, there is method and a controller for controlling burst mode operation of a switched mode power supply (SMPS). It also relates to switched mode power supplies comprising such a controller. One way to increase the efficiency of a switched mode power supply is to operate it at a power level close to the optimum efficiency point for a brief period, followed by a period where the power supply is not switching during which no energy is wasted. This type of operation is known as “burst mode” and results in high efficiency at low power levels.

Abstract: With a power conversion device, it is possible to lengthen the lifespan of a mechanical switch by preventing an absorption by the mechanical switch of induction energy accumulated in a reactor when there is a problem. When a mechanical switch is turned off when there is a problem, an absorption by the mechanical switch of induction energy accumulated in a reactor is prevented by the energy accumulated in the reactor being released to a capacitor via a diode, thus enabling a lengthening of the lifespan of the mechanical switch.

Abstract: In a step-down switching regulator, a switching element is a high-voltage NMOS transistor, turned on and off based on a control signal generated by a controller, and charges an inductor with an input voltage input to an input terminal. A first drive circuit is a low-voltage MOS transistor and turns on and off the switching element based on the control signal. A voltage generator generates a predetermined first power supply voltage not greater than a withstand voltage of the low-voltage MOS transistor. A capacitor is connected in parallel with the first drive circuit and stores charge from the voltage generator to supply power to the first drive circuit. One end of the capacitor is connected to a junction node between the switching element and the inductor, and the other end of the capacitor is supplied with the first power supply voltage generated by the voltage generator.

Abstract: A power conversion system and power control method for reducing cross regulation effect uses a voltage feedback adjustment circuit to modulate an error signal fed back from an output voltage so as to predict the energy of an output corresponding to its load states. While the energy delivered to an output terminal with its load remaining the same does not change, the energy delivered to an output terminal with its load changing is adjusted accordingly. The power conversion system thus effectively reduces the cross regulation effect and obtains excellent steady system output and transient response.

Abstract: A method and apparatus for detecting output current in switching power supplies forgoes the need for any resistor or other components in series with the load. A method according to the invention includes the steps of inferring the peak current through the inductor as a function of input voltage and inductor charge time, and deriving the current available to the load based upon the flyback voltage during discharge of the inductor. Although a disclosed example is based upon a buck/boost topology, other converter topologies are anticipated. In terms of apparatus, in a switching power supply of the type wherein a switching device is used to charge an inductor that discharges to a load, the invention provides devices arranged for detecting output current without the need for a resistor or other component in series with the load.