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7375471 |
Charging circuit
A charging circuit has a battery 12 , switching element 14 , and resistor 16 for current detection arranged on the primary side of transformer 10 . Diode 18 and capacitor 20 for storing...
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7336057 |
DC/DC converter
A DC/DC converter includes: a boost converter that boosts an input voltage in accordance with a first control signal; an insulated converter that converts an output of the boost converter in...
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7247955 |
PWM power supplies using controlled feedback timing and methods of operating same
A closed loop power converter circuit of a UPS or other power supply includes a pulse width modulator circuit in a forward path of the closed loop power circuit. A compensation circuit provides...
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7242596 |
Control method for switching power supply circuit
A control method for controlling a switching power supply circuit has a control circuit including a setting device that limits the exciting current of a transformer at the time of changeover from a...
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7130201 |
Power supply device for outputting stable programmable power supply
The present invention discloses a power supply device for outputting a stable programmable power supply, which comprises a transformer disposed at a DC output end of the power supply device, and a...
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7057907 |
Power converter having improved control
A power converter using a microcontroller is disclosed herein. In one embodiment, the power converter can be a digital flyback or forward converter. The microcontroller may have a digital...
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6900995 |
PWM power converter controlled by transistion detection of a comparator error signal
A method of regulating voltage at an output of a switching power converter includes sensing an output voltage feedback signal; comparing the sensed feedback signal to a reference at a determined...
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6894911 |
Method of driving a power converter by using a power pulse and a sense pulse
A method of regulating voltage at an output of a switching power converter, the converter comprising a switch and pulse generation circuitry, the pulse generation circuitry producing one or more...
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6882552 |
Power converter driven by power pulse and sense pulse
A power converter for delivering power from a source to a load includes a switch, pulse generation circuitry producing one or more drive signals for cycling the switch ON and OFF, wherein if the...
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6850422 |
Converter circuit with controllable switching means utilizing a switching frequency window
A converter for converting an input voltage (U i ) between a first supply terminal ( 1 ) and a second supply terminal ( 2 ) to an output voltage (U 0 ), which converter includes switching means (S...
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6717826 |
Method to reduce bus voltage stress in a single-stage single switch power factor correction circuit
The present invention provides an apparatus and method for reducing the voltage stress in a single-stage single-switch (SSSS) converter by modulating the predetermined operating frequency of the...
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6418039 |
Method and apparatus to digitally control turn-off time of synchronous rectifiers in isolated topologies for switched mode power supplies
Presented is a circuit and method capable to digitally control and, in particular, to control the switching of one or two MOSFETs used as rectifiers in switched mode power supply isolated...
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6256210 |
Converter for conversion of an input voltage into an output voltage
A converter for the conversion of an input voltage between a first supply terminal and a second supply terminal into an output voltage, including a switching means which in operation are turned on...
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6137702 |
Circuit and method of activating and de-activating a switching regulator at any point in a regulation cycle
A switching regulator (18) for use in a switching power supply (10) receives a feedback signal and provides a gate drive signal. The switching regulator enables the gate drive signal once at any...
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6137696 |
Switching regulator for power converter with dual mode feedback input and method thereof
A switching power supply (10) uses a switching regulator (18) that is capable of operating in a dual mode with either primary side regulation or secondary side regulation. The primary and secondary...
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6088243 |
Power supply apparatus
A power supply apparatus includes a switching element for relaying electrical current to be supplied to a transformer and a controlling circuit for controlling an operation of said switching...
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6049471 |
Controller for pulse width modulation circuit using AC sine wave from DC input signal
A pulse width modulation (PWM) controller suitable for use with a variety of open loop topology power supply circuits including ring generator circuits. The controller and the circuit realized...
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6028776 |
Power factor correction converter
A PFC converter includes a bridge diode, a booster section controlled for improving a power factor of the bridge diode, a transformer section supplied with an output of the booster section via a...
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5940281 |
Switched-mode power supply with magnetic flux density control
A switched-mode power supply with a transformer where the output current or the output voltage is controlled or regulated as a function of the, magnetic flux density of the transformer. Thus it is...
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5812383 |
Low power stand-by for switched-mode power supply circuit with burst mode operation
A switched-mode power supply circuit having an operating mode and a stand-by mode. The switched-mode power supply circuit includes a transformer and a controllable switch connected to a primary...
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5748461 |
SMPS with low load switching frequency stabilization
A switch-mode power supply has a control device with an input for a control voltage which is coupled to a secondary voltage and an output for controlling a transistor that is connected in series...
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5710697 |
Power supply controller having frequency foldback and volt-second duty cycle clamp features
A power supply controller implementing frequency foldback and volt-second duty cycle clamp features. An oscillator timing capacitor is charged with a fixed current and is discharged with a fixed...
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5668706 |
Load driving circuit
This invention relates to a load driving circuit having a fail-safe breaking mechanism for breaking a primary power source when a failure occurs. This invention also relates to a load driving...
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5636110 |
Small form factor power supply
A new, small form factor power supply is disclosed that provides a regulated DC power supply in a package that radiates relatively little heat and that occupies 2.85×5.0×0.436 inches. The...
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5631810 |
Control of switching devices in synchronized-rectification system
A switch controller in a DC--DC converter performs the switching control of a primary switch and a freewheel switch which are connected to the primary and the secondary of a transformer,...
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5576941 |
Modular power supply system
A modular power supply system (10) is provided for providing a multiplicity of output voltages from a plurality of respective converter modules (70a-70n). Each of the converter modules (70a-70n)...
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5548501 |
High-voltage power supply circuit with a voltage discharging circuit
A high-voltage power supply circuit consisting of an amplifier, a sine wave generating circuit, an AC/DC converter, a microcontroller, a transformer, a rectifier diode, a filter capacitor, a first...
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5513089 |
Switching power source control circuit for controlling a variable output to be a target value by thinning-out switching pulses
A switching power source control circuit comprising a comparator, a thin-out-processed pulse generator, a thinned-pulse detector, and a reset speed regulator, wherein: the comparator compares an...
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5499184 |
Power switch circuitry for electrically isolating the power switch from a power supply
A power switch circuit including a small signal transformer and a low power oscillator for detecting the power switch while isolating it from the primary of the power supply. When the power switch...
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5488553 |
Power converter apparatus for defibrillating cardiac pacemaker
A power converter apparatus adapted for use in a defibrillating cardiac pacemaker, to selectively provide a prescribed high voltage useful in treating a cardiac fibrillation. A pulse...
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5486992 |
High voltage direct current power supply with feedback control and circuit protection
A high voltage direct current power supply having feedback control and a tection circuit for maintaining a controlled, stabilized output voltage. An oscillator is coupled to a transformer which in...
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5469349 |
Power supply circuit and control circuit for use in a power supply circuit
A power supply circuit for generating a stabilized power supply generally comprises a series arrangement of a primary winding of a transformer and a switch. The switch is controlled by a control...
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5461671 |
Telephone line power utility circuit
A telephone line power utility circuit, in which direct-current power supplied through a telephone line-side is utilized as a power source for a line terminal device having a direct-current...
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5450304 |
Single board engine controller power supply
A power supply for controlling voltage supplied to a microprocessor-based controller, for an internal combustion engine utilizing pulse position modulation to regulate output voltage during periods...
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5412556 |
Switched mode power supply circuit including a control circuit having two modes of operation each mode selected in dependence on the power to be supplied at the output
In switched-mode power supply circuits the switch is rendered conducting for a longer period (or more frequently), dependent on the load connected to the power supply circuit, so as to ensure that...
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5369472 |
Microprocessor controlled high voltage power supply
The present invention is a power supply apparatus capable of providing one or more individually controllable high voltage outputs for various components within an electrophotographic printing...
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5349523 |
Switching power supply
A switching power supply comprising a converting circuit; an analog-to-digital converter for converting a signal referring to an output signal from the converting circuit into digital form; a...
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5291387 |
Switching voltage regulator with protective device against thermal breakdown
A switching-type voltage regulator of this invention comprises a voltage control section for generating a stabilized voltage by controlling a voltage supply period from input side to output side,...
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5291386 |
Switched mode power supply with precharge of base-emitter sweep-out capacitor
A television receiver has a switched mode power supply for regulating an output voltage, including a power transformer having a primary winding coupled to an unregulated voltage via a power...
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5289359 |
DC-DC power converter including sensing means for providing an output when the reserve power of the converter falls below a predetermined amount for a given input voltage
A DC to DC power converter in the form of a pulse-width modulator is shown which can sense via an indication of duty cycle how much reserve power is available for loads using the present input...
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5285368 |
Power source device responsive to supplemental plural output voltages
A power source device is disclosed with a transformer having a plurality of windings provided with the secondary of the transformer, first and second smoothing means connected to a predetermined...
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5272614 |
Microprocessor-controlled DC-DC converter
A microprocessor-controlled DC-DC converter includes a controllable switch for generating at least one output voltage (Ua). The duty cycle of the controllable switch is controllable depending upon...
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5258903 |
Control circuit and power supply for televisions
An adaptive feed forward control circuit and power supply for a television comprises a circuit for supplying energy from a source to a load, the load having energy requirements which vary in...
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5132891 |
Power supply apparatus
A power supply includes a switch mode power regulator coupled to a control circuit arrangement which synchronizes signals from a controlled oscillator with horizontal synchronous pulse trains to...
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5126930 |
Switched mode power supply controller having a stand-by state using a frequency divided burst mode
The present invention relates to a power supply device adapted for various electric or/and electric instruments. The present invention generates lower voltages during a standby mode except for...
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5086382 |
Circuit configuration for a controlled blocking oscillator converter switching power supply
A circuit configuration for a controlled blocking oscillator converter switching power supply includes an electric switch having a duty cycle. A transformer has a primary winding connected in...
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5063489 |
Switching regulator having improved switching control arrangement
In order to obtain a stable dc output from a switching regulator of a type in which a switching control arrangement is provided with an optical coupler, an A-D converter is arranged to provide the...
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5034873 |
Circuit configuration for a fixed-frequency blocking oscillator converter switching power supply
A circuit configuration for a fixed frequency blocking oscillator converter switching power supply includes an electric switch. A transformer has a primary winding connected in series with the...
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5029269 |
Delayed power supply overvoltage shutdown apparatus
A pulse-width modulated DC-DC power supply is illustrated with overvoltage protection which upon initial detection momentarily shuts down the pulse-width modulating portion of the control loop for...
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4951186 |
Single-ended forward frequency converter with a transformer and a demagnetization means
A single-ended forward frequency converter which includes a transformer and a storage capacitor C1 wherein the storage capacitor C1 forms a main resonant circuit with an inductance L1 and a series...
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