How to Switched-mode power supply?

PWM controller with temperature regulation of switching frequency,Switched mode power supply comprising function for recognition of broken feedback loop,Improved structure of switch power supply of industrial control computer,Protection circuit of switch power supply

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A switched-mode power supply (switching-mode power supply, switch-mode power supply, switched power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a DC or AC source (often mains power) to DC loads, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. A hypothetical ideal switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time (also known as duty cycles). In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.

PWM controller with temperature regulation of switching frequency

ActiveUS20060038627A1Reduce power lossReduce the temperaturePulse generation by bipolar transistorsGenerator stabilizationEngineeringSwitching frequency

A circuit for controlling the switching frequency of an oscillator for a PWM controller for a switching mode power supply, comprising a first stage providing a signal which is related to the temperature of the controller for the switching mode power supply; and an oscillator having an oscillation frequency and being responsive to the signal from the first stage for changing the oscillation frequency such that the oscillation frequency decreases as the temperature increases and vice versa.

PWM controller with temperature regulation of switching frequency

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Owner:INFINEON TECH AMERICAS CORP

Switched mode power supply comprising function for recognition of broken feedback loop

InactiveCN1441991ADc-dc conversionElectric variable regulationControl signalEngineering

The invention relates to a switched mode power supply with the following features: a primary coil (L1) and a switch element (TS) wired in series with the primary coil (L1), for applying a DC voltage (Vg) to the primary coil according to a control signal (AI); a secondary circuit, coupled to the primary coil (L1) with output terminals (AK1, AK2) to provide an output voltage (Vout); a control circuit (IC), for preparation of the control signal (AI), with a feedback signal (Urk) dependent on the output voltage (Vout) supplied to the control circuit; the control circuit (IC) comprises a signal generation circuit (PWM) to create the control signal (AI) and a protection circuit (PUS). Said protection circuit (PUS) has the effect that no control signal (AI) is delivered to the switch element (TS), if the feedback signal (Urk) reaches the value of a first reference signal (U1) after a first period (T3) after starting the control circuit (IC).

Owner:INFINEON TECH AG

Improved structure of switch power supply of industrial control computer

InactiveCN106992697AReduce distractionsSuppression of conducted interferenceAc-dc conversion without reversalElectrostatic discharge protectionTransformerConducted Interference

The invention discloses an improved structure of a switch power supply of an industrial control computer in the technical field of industrial control and power supplies. The improved device comprises a power supply base shell. A power supply housing is arranged on the outer wall of the power supply base shell. A printed circuit board is arranged on the outer wall of the power supply base shell. An alternating current input port is arranged in the top of the power supply base shell, and is electrically connected with the printed circuit board. A direct current output port is arranged in the bottom of the power supply base shell and is electrically connected with the printed circuit board. A high frequency transformer is arranged on the left side of the printed circuit board. A heat radiator is arranged at the bottom of the high frequency transformer. In this way, a problem of waveform distortion of input current is solved, a problem is solved that higher harmonic waves generated by a switch power supply of the current industrial control computer will generate conducted interference and radiated interference along a power transmission line of the industrial control computer and normal operation of electrical appliances of a power supply system circuit is ensured.