|
Match
|
Document |
Document Title |
|
|
7375988 |
Self-synchronized high voltage synchronous rectifier and drive
This invention describes a method for using self-synchronized (also known as self-driven), synchronous rectifiers in converters employing high output voltages or conversely, in converters with wide...
|
|
|
7342811 |
Lossless clamp circuit for DC-DC converters
A lossless clamping circuit for use in a synchronous rectifier DC-DC converter in which at least one transistor switch (MOSFET) periodically connects two terminals of an output transformer winding...
|
|
|
7315461 |
Power supply device
An object of this power supply device is to enable an overheat protection level and an overvoltage protection level to be set accurately. This power supply device includes a Schottky barrier diode...
|
|
|
7304867 |
DC-DC converter of multi-output type
A DC-DC converter of multi-output type is provided wherein a primary winding 5 a is wound around core halves 5 g , 5 h of a transformer 5 between first and second secondary windings 5 b , 5...
|
|
|
7291993 |
Method for driving a fluorescent lamp and an inverter circuit for performing such a method
A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an...
|
|
|
7272023 |
High efficiency power converter
A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a...
|
|
|
7262977 |
Switching-mode power supply having a synchronous rectifier
A switching-mode power supply capable of causing conduction through a synchronous rectifier switch exactly when required. Included is a transformer having a primary winding connected to a pair of...
|
|
|
7224590 |
Forward converter with synchronous rectifier and reverse current control
A control circuit for use in a power converter has a synchronous rectifier for producing substantially direct current, including a sensor for sensing a characteristic of the power converter;...
|
|
|
7212418 |
Synchronous rectifier control circuit
A synchronous rectifier control circuit improves energy conversion efficiency and uses a signal produced by a secondary winding of a transformer in a rectifier circuit to control a low-impedance...
|
|
|
7208883 |
Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit
In the current detection circuit that detects the output currents of a switching power supply circuit, an improved current detection circuit makes it possible to detect the output current...
|
|
|
7206208 |
Synchronous rectifying control circuit
A synchronous rectifying control circuit for utilizing in a forward topology of rectifying circuit. The circuit controls a first current switch and a second current switch provided on both ends of...
|
|
|
7203041 |
Primary side turn-off of self-driven synchronous rectifiers
There is disclosed a power conversion circuit including self synchronous rectifiers and a rapid shutdown section. When power is removed from the power conversion circuit, the rapid shutdown section...
|
|
|
7196920 |
Synchronous rectifier drive circuit for low output voltage active clamp forward converter
A drive circuit for a synchronous rectifier has a transformer having a main secondary winding and an auxiliary secondary winding. A first switch and a second switch each have a pair of terminals, a...
|
|
|
7196916 |
Alternated duty cycle control method for half-bridge DC-DC converter
Apparatus, methods system and devices for using alternated duty cycle control to achieve soft-switching for at least one switch of the two half-bridge switches. When soft-switching can be only...
|
|
|
7196913 |
DC conversion apparatus
A DC conversion apparatus includes a switch converting a DC voltage of a DC power source to a high-frequency voltage by being turned ON/OFF via a primary winding of a transformer, a series circuit...
|
|
|
7173831 |
Power converter having a primary side switching circuit
In one embodiment, an apparatus includes a transformer having a primary winding and a secondary winding and a switching circuit to facilitate a periodic application of an input voltage to the...
|
|
|
7167384 |
Switching power circuit
A switching power circuit in which a synchronous rectification circuit of the winding voltage detection system by use of a resistance device is provided on the secondary side of a compound...
|
|
|
7161813 |
Power conversion device with synchronous rectifier driving and voltage oscillation limitation during a discontinuous operating mode
A power conversion device includes a first and second input terminal for connection to a transformer winding and at least an output terminal. A first and second synchronous rectifier are associated...
|
|
|
7158392 |
Switching power supply device and the semiconductor integrated circuit for power supply control
It is aimed at decreasing losses not only in a synchronous rectifier circuit provided at a secondary side of a DC-DC converter, but also in a full-bridge switching circuit provided at a primary...
|
|
|
7139179 |
Switching mode power converter having secondary side bias generating and driving circuit to provide synchronous rectification and active clamp
A switched mode power converter includes a transformer having a primary winding, a secondary winding, and a bias winding. A primary side power switch is coupled to the primary winding and is...
|
|
|
7120036 |
Switching-mode power supply having a synchronous rectifier
A DC-to-DC converter incorporates a transformer having a primary winding connected to a pair of DC input terminals via an active switch, which turns on and off under the control of a feedback...
|
|
|
7116563 |
Dual mode over-current protection for switching mode power converter
A control circuit for a switched mode power converter is adapted to receive a current sense signal reflecting the output current of the power converter and a feedback signal reflecting the output...
|
|
|
7116562 |
Synchronous rectification switching power supply
A fly-back type synchronous rectifying switching power supply device in which a rectifying element is turned off before the main switch is turned on even when the on-time of a main switch element...
|
|
|
7092260 |
Short-circuiting rectifier for a switched-mode power supply
A control circuit for controlling the output voltage of a primary-controlled switched mode power supply. The switched mode power supply includes a primary-side switch and a transformer with a...
|
|
|
7072190 |
High efficiency power converter
A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a...
|
|
|
7054168 |
Undershoot eliminator circuit and method for synchronous rectified DC-DC converters
An undershoot eliminator circuit is disclosed that avoids the occurrence of a negative undershoot that typically happens when an isolated DC-DC converter with a secondary side synchronous driver...
|
|
|
7050310 |
Synchronous rectification circuit with dead time regulation
A synchronous rectification circuit with dead time regulation being adapted for a forward power supply to regulate a dead time of a switch circuit is described. The synchronous rectification...
|
|
|
7042739 |
Switching electric source device
A switching electric source device includes a first synchronous rectifier control circuit, which detects the resonance state developed based on the exciting energy of the primary winding after the...
|
|
|
7038922 |
Direct energy transfer converter
The invention concerns a direct energy-transfer converter of the AC/AC or DC/DC type, including a self-regulated synchronous rectifier, in which the rectifier switches are controlled through one or...
|
|
|
7035120 |
Driving circuit employing synchronous rectifier circuit
An example synchronous rectifier circuit includes a transformer having a primary winding and a secondary winding which are insulated from each other; a main switch provided at a primary side of the...
|
|
|
6995988 |
Forward power converter with self-excited synchronous rectifying circuit
A forward power converter with a self-excited synchronous rectifying circuit makes use of the self-excitation function of a transformer to generate electric energy at a secondary side winding coil...
|
|
|
6987679 |
Multiple output converter with improved cross regulation
A cost effective circuit improves the cross regulation of multiple outputs converter, especially for that output chokes are coupled and a synchronous rectifier is applied to one of the outputs. A...
|
|
|
6980441 |
Circuit and method for controlling a synchronous rectifier in a power converter
A control circuit and corresponding method, particularly for power converters in a system having paralleled power converters, for rapidly and efficiently controlling a free-wheeling synchronous...
|
|
|
6961256 |
Synchronous rectifier with dead time adjusting function
A synchronous rectifier with dead time adjusting function is used in fly-back power supplies for adjusting dead time of switches. The synchronous rectifier has a rectifying circuit connected to a...
|
|
|
6940732 |
Synchronous rectifier circuit
There is provided a synchronous rectifier circuit that makes it possible to secure sufficient driving voltage for the rectifier switch regardless of the voltage of the secondary winding. In this...
|
|
|
6912138 |
Synchronous rectifier control circuit
A synchronous rectifier control circuit for controlling a synchronous rectifier of a power converter is disclosed. According to one embodiment, the control circuit includes a differentiator circuit...
|
|
|
6888728 |
Switching power supply unit
A switching power supply unit of the present invention a timing generating circuit ( 121 ) which receives a first control signal formed by a rectifier-transistor driving circuit ( 104 ), forms a...
|
|
|
6882548 |
Auxiliary active clamp circuit, a method of clamping a voltage of a rectifier switch and a power converter employing the circuit or method
The present invention is directed to an auxiliary active clamp circuit and a method of clamping a voltage of a rectifier switch associated with a power converter. The power converter includes a...
|
|
|
6879499 |
DC-DC converter
A DC-DC converter includes an ON-timing delay circuit in which, when an ON signal is output from a power switch driving circuit in a control IC to a power switch, the ON timing of the power switch...
|
|
|
6870747 |
Control circuit for synchronous rectifiers in DC/DC converters to reduce body diode conduction losses
A controller for a switching power supply having first and second synchronous rectifiers that minimizes the reverse recovery time and body diode conduction losses of each of the synchronous...
|
|
|
6862197 |
Arrangement for demagnetizing a transformer
To demagnetize a transformer (TR) in a single-ended forward DC/DC converter with self-driven synchronized rectifiers (V 1 , V 2 ) connected across the secondary winding (N 2 ) of the transformer...
|
|
|
6859373 |
Switching-mode power converter with complementary synchronous rectification
A switching-mode power converter includes input and output circuits. A transformer having primary and secondary windings which are respectively coupled to the input and output circuits. The...
|
|
|
6856522 |
Synchronous rectifier gate drive circuits for zero voltage switching power converters
Synchronous rectifier gate drive mechanisms are revealed which are universally applicable to zero voltage switching power converters which rely on an auxiliary inductor to drive the critical turn...
|
|
|
6853562 |
Voltage sense method and circuit which alleviate reverse current flow of current bi-directional converters
The Voltage Sense Method is introduced and a number of its implementations using Voltage Sense Circuit are demonstrated to solve problems associated with the start-up of parallel switching...
|
|
|
6845018 |
Power circuit and method for controlling drive and control voltages of an image formation apparatus
Synchronous rectifier circuits are provided for each secondary windings of a transformer. Field-effect transistors of which ON voltage is lower than the forward voltage of a diode are provided in...
|
|
|
6839246 |
Self-driving circuit for a DC/DC converter
The present invention provides a self-driving circuit of a low voltage, large current, and high power density DC/DC converter. The converter comprises a transformer, power MOS transistors (S),...
|
|
|
6831847 |
Synchronous rectifier drive circuit and power supply including same
A drive circuit for a synchronous rectifier of a switch mode power converter is disclosed. The switch mode power converter may include a main power transformer and a primary switch for cyclically...
|
|
|
6822882 |
Gate driver with a DC offset bias circuit and a power converter employing the same
A gate driver and a method of driving a switch for use with a power converter having a main active clamp circuit associated with a main power switch coupled to a primary winding of a transformer...
|
|
|
6807069 |
Direct current converter with integrated transformer windings and output voltage filtering coils on the same magnetic core
Chopper-type direct-current converter comprising a magnetic core (M), which comprises a first and a second side leg (MS 1 , MS 2 ), the ends of which are connected to each other with pieces, and a...
|
|
|
6788554 |
Switched mode power converter having synchronous rectification and secondary side post regulation
A switched mode power converter includes a transformer having a primary winding and at least one secondary winding, a primary side power switch coupled to the primary winding and adapted to...
|