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7609533 |
Light-load efficiency improving method and apparatus for a flyback converter
A flyback converter has a controller to switch a power switch so as to convert an input voltage to an output voltage for a load by monitoring an output voltage dependent signal and a current...
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7580271 |
Apparatus and method for suppressing the input current inrush for a voltage converter in a pre-charge stage
An apparatus and method are provided for suppressing the input current inrush for a voltage converter in a pre-charge stage. The voltage converter comprises a power input for receiving an input...
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7539028 |
Method and apparatus for fault detection in a switching power supply
Techniques are disclosed to detect a fault in the feedback circuit of a switching power supply while the power supply operates in a mode where the output is below its regulated value. The power...
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7492612 |
High-voltage generator
A high-voltage generator includes a high-voltage transformer having a primary coil, a secondary coil, and an auxiliary coil, and a PNP bipolar junction transistor. Based on the self-oscillation...
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7466568 |
Switching power supply circuit
A switching power supply circuit of the present invention includes: a transformer including a main winding and an auxiliary winding, which are magnetically coupled together on a primary winding...
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7433208 |
Switching power supply device and electronic apparatus
A switching power supply device includes a primary winding of a transformer that is connected in series to a first switching element, and a secondary winding is provided with a rectifier circuit...
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7423385 |
System and method for controlling voltage on discharge capacitors which control light energy from flash lamps
A system and method are described for controlling voltage on discharge capacitors which control light energy from flash lamps, wherein the method includes measuring over time an operational...
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7394670 |
Switching power source
A control circuit 8 of a switching power source comprises a voltage detector 31 for detecting a voltage V DC of a DC power supply 1 to produce a detection voltage V DT ; a comparator 41 ...
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7295449 |
Simple switched-mode power supply with current and voltage limitation
This invention relates to a primary-controlled switched-mode power supply of the type of a free-running flyback converter, which comprises a transformer with a primary-side winding, a...
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7170763 |
Apparatus and method for constant delta current control in a capacitor charger
In a capacitor charger, a transformer has a primary winding connected between an input voltage and a switch for generating a primary current flowing through the primary winding by switching the...
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7170762 |
Low voltage DC-DC converter
A direct current to direct current voltage converter (DC-DC converter) in accordance with the invention comprises a transformer coupled with a voltage source and a self-starting oscillator that...
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7139500 |
Image fusing device and image forming apparatus
This invention is intended to control the amount of power to be supplied to a fusing heater below a maximum applicable current value. The engine controller supplies electricity to both of two...
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7123488 |
DC/DC converter including a Zener diode having a substantially zero temperature coefficient
A DC/DC converter has a transformer having a primary winding, a secondary winding, and an auxiliary winding, a switching transistor connected in series to the primary winding, a control transistor...
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7119499 |
Switching power device
A switching power device uses a non-capacitor flyback converter circuit not provided with a smoothing input capacitor having a large capacity. Therefore, a power harmonic can be suppressed and a...
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7102898 |
Isolated drive circuitry used in switch-mode power converters
A drive transformer and associated circuitry for providing power and appropriate delays to primary switches and synchronous rectifiers in switch-mode power converters. The circuitry takes advantage...
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7035119 |
Switching power source device
A switching power source comprises a current comparator 27 for comparing a voltage level of signals acquired by a current detector 9 with a reference voltage level V DT to produce detection...
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7023710 |
Method of operating a switched-mode power supply and switched-mode power supply
In the case of known switched-mode power supplies with integrated preconditioner, the control curves are largely congruent, but deviate from one another in low-load operation, whereby the...
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7012816 |
Self-excited switching power supply circuit
A self-excited switching power supply circuit is provided which reduces a discharge current generated when an oscillating field effect transistor ( 3 ) is turned on, whereby it is possible to...
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7009851 |
Power unit having self-oscillating series resonance converter
The present invention relates to a power unit with a self-oscillating series resonance converter for feeding of a load. The series resonance converter comprises: two transistors TR 1 , TR 2 ...
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7006363 |
DC-DC converter circuit having correction circuit for outputting voltage level inversely proportional to input voltage
A DC-DC converter circuit for stabilizing the output voltage of the secondary side by correcting the input voltage by using a simple circuit, where no state measurement circuit is necessary at the...
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6999324 |
Method for operating a switch in a free-running switch mode power supply, and a drive circuit for a switch in a free-running switch mode power supply
A method for operating a switch, which is connected in series with a primary coil of a transformer in a free-running switch mode power supply, includes the provision of a modulation signal and the...
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6985369 |
DC-DC converter
A DC-DC converter achieves a high level of a signal superimposed in an AC manner onto the output of an insulator such as a photocoupler, and there are very few limitations in the aspects of...
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6958920 |
Switching power converter and method of controlling output voltage thereof using predictive sensing of magnetic flux
A switching power converter and method of controlling an output voltage thereof using predictive sensing of magnetic flux provides a low-cost switching power converter via primary-side control...
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6903943 |
Switching circuit
This switching circuit includes a transformer having primary and secondary windings insulated from each other; a voltage-driven switching element which is connected in series to one of the primary...
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6903942 |
Switch mode power converter
A regulated, switch mode power converter is described. An embodiment of the present invention provides regulated, switch mode power conversion from alternating current to direct current utilizing a...
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6898090 |
Switching power supply unit and electronic apparatus using the same
A switching power supply unit includes a transformer including a primary winding, a secondary winding, and a feedback winding; an input power supply and a first switching element that are connected...
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6862196 |
Integrated switch with RF transformer control
The invention concerns a control circuit for controlling a power switch by means of a galvanic insulation transformer, the transformer being produced in the form of planar conductive windings on an...
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6862193 |
Power supply apparatus
There is provided a power supply apparatus that can raise the power supply efficiency while an appliance in which the power supply apparatus is installed is in a standby state, with a simple...
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6819226 |
Systems and methods for energy storage in land-based telemetry applications
The invention involves systems and methods of providing energy to land-based telemetry devices wherein the energy storage and power conditioning system is comprised of an input power supply, an...
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6816392 |
Overcurrent output protecting circuit and constant-voltage switching power supply incorporating the same
An overcurrent output protector is electrically connected to a constant-voltage switching power supply provided with a switching transistor which converts a DC voltage obtained by smoothing an AC...
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6798671 |
Switching power supply unit
The present invention provides a worldwide compatible switching power supply unit of an RCC system in which by reducing the number of components or parts, reduction of cost can be realized and the...
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6765809 |
Power source circuit having regulated primary current
A power source including a transformer having a primary coil, a secondary coil, and a feedback coil; a resonance capacitor connected in parallel with the primary coil of the transformer in...
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6693406 |
Method of controlling a motor and a power supply apparatus
The present invention relates to a method and an apparatus for controlling an electric motor by regulating at least the current I out , the voltage U out and the frequency f out to an input of...
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6657877 |
Power supply circuit
A power supply circuit improves the power factor when the load is light, and incorporates a starting circuit for reacting quickly to the changes in the output from the power supply circuit and a...
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6643147 |
Modulation technique for flyback converter
A method of improving modulation resolution in a flyback converter by pulsewidth- and/or position-modulation of a subtractive constant current with specific timing considerations is applicable to...
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6643144 |
Circuit configuration for applying a supply voltage to a load and method for such application
A circuit configuration for pulsed application of a first supply voltage to a load includes a first switch, connected in series with the load, a first control connector, a control circuit for...
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6633156 |
Device for monitoring the flow of a substantially direct current in a load and method for the implementation of this device
A device for monitoring the flow of a current in a load powered by a DC voltage source and a method for the implementation of the device. The device includes, series-connected with the load, a...
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6631079 |
Switching power supply apparatus having plural outputs and plural output voltage detection
A switching power supply apparatus comprises a transformer having primary winding and at least two secondary windings, a first switching element connected in series with the primary winding, a...
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6614667 |
Method and apparatus for driving switching element in power converter
A power conversion apparatus capable of reducing the conduction loss to achieve high efficiency yielding a downsized and weight-reduced apparatus and a method for driving such a power conversion...
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6608768 |
Use of a rectified image voltage for controlling the switch on the primary side of a switched-mode power supply
A switched-mode power supply has primary and secondary sides, and a transformer (M 1 ) with a primary winding, a secondary winding and an auxiliary winding. The primary winding and the auxiliary...
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6577511 |
Switching power supply unit and electronic apparatus using the same
A switching power supply unit includes a control circuit including a turn-off circuit for turning of a first switch element Q 1 , which has been in an ON state, and an off-period control circuit...
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6567280 |
Method and circuit for detecting light load mode of switching power supply system
A method and a circuit for detecting a light load mode of a switching power supply system are provided. The switching power supply system has a first winding, a second winding, a third winding...
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6552623 |
Self-oscillation type switching power supply unit
A switching transistor is connected to a primary winding of a transformer, an oscillation frequency control circuit is connected to a feedback winding, the oscillation frequency control circuit...
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6542388 |
Intermittent switching power supply circuit
An intermittent switching power supply circuit prevents excessive output power on a secondary side of a circuit. An intermittent oscillator is alternately switched on and off to maintain output...
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6535407 |
DC/DC converter having a piezoelectric transformer and rectification-smoothing circuit
A DC/DC converter is provided that includes a switch device for converting a DC voltage into an AC voltage, a piezoelectric transformer for changing the AC voltage and a current doubler type...
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6529388 |
High voltage generating apparatus for use in toner system printing device
In a configuration which is provided with a voltage control circuit 2 for supplying a DC voltage control signal created on the basis of the voltage detecting signal 44 to an terminal of an...
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6525948 |
Apparatus and method for the detection of circuit irregularities and for circuit protection of a power supply
The present invention provides a ring choke converter, a kind of power supply, and method thereof. In addition to the transformer, the switch component, the positive feedback circuit and the...
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6504733 |
Switch mode power supply
When a main switching transistor of a zero voltage switching power supply is conductive, a voltage is developed in a current sensing resistor coupled in series with the transistor. The voltage in...
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6501666 |
Method and apparatus for magnetic amplifier to reduce minimum load requirement
This invention provides a method and apparatus for magnetic amplifier to reduce the minimum load requirement of power supply. The apparatus comprises a voltage-dropper and a current-limiter....
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6483725 |
DC/DC conversion circuit having a switching frequency proportional to power output
DC/DC conversion circuit ( 1 ), includes a transformer ( 2 ) having a primary winding ( 3 ), a secondary winding ( 4 ), and an auxiliary winding ( 5 ); a switching transistor (T), including a...
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