Patent
Method and apparatus for reducing standby power in power supplies
Reads0
Chats0
TLDR
In this article, the OFF time of the flyback transformer's main switch is modulated as a function of the feedback control current when the load drops below a predetermined level, which can be avoided by a clamping feature that limits the expansion of the off time.Abstract:
Power consumption of a low-power flyback power converter under standby-load or no-load conditions is reduced by modulating the OFF time of the flyback transformer's main switch as a function of the feedback control current when the load drops below a predetermined level. This modulation overcomes the conventional frequency-increasing modulation of the ON time at low output power levels so as to reduce the switching frequency, and hence the switching losses, to minimal levels as the load is reduced. Excessive frequency reduction can optionally be avoided by a clamping feature that limits the expansion of the OFF time.read more
Citations
More filters
Patent
Control circuits and methods for switching mode power supplies
TL;DR: In this article, a switching mode power supply (SMPS) includes a transformer having a primary winding, a secondary winding for providing an output voltage, and an auxiliary winding for inducing a second electrical signal in the auxiliary winding.
Patent
System and method providing over current and over power protection for power converter
TL;DR: In this paper, a threshold generator is used to generate a threshold signal, and a first comparator is configured to compare the threshold signal with a first signal and a comparison signal.
Patent
Primary side control circuit and method for ultra-low idle power operation
TL;DR: In this paper, a method and circuit for reducing power consumption during idle mode to ultra-low levels, such as about 1/10 th to 1/1000 th or less of active power is disclosed.
Patent
System and method providing over current protection based on duty cycle information for power converter
TL;DR: In this paper, a system controller for protecting a power converter includes a signal generator, a comparator, and a modulation and drive component, which is coupled to the signal generator.
Patent
Load condition controlled power strip
TL;DR: In this article, a power strip is configured for reducing or eliminating power during idle mode by disengaging an outlet from power input, and the switch facilitates disengaging of the current transformer primary from the outlet.
References
More filters
Patent
Control circuit and method for maintaining high efficiency over broad current ranges in a switching regulator circuit
TL;DR: In this paper, a circuit and method for controlling a switching voltage regulator having a switch including one or more switching transistors and an output adapted to supply current at a regulated voltage to a load including an output capacitor is presented.
Patent
Power supply apparatus for the reduction of power consumption
TL;DR: In this article, a power supply apparatus having an AC power supply, a transformer, a switching element and a control circuit for controlling an operation of the switching element is presented, where an electrical current is supplied to the primary side of the transformer intermittently when a main unit of an electrical appliance to which the power supply is applied is in a standby mode so that unnecessary power consumption is reduced.
Patent
Functional on/off switch for switched-mode power supply circuit with burst mode operation
TL;DR: In this article, a switchable switch connected to a primary winding of a transformer for switchable connecting the primary winding to a source of dc voltage was used to switch off a switchboard.
Patent
Switching power supply unit
TL;DR: In this article, an MOS type FET switches over the voltage level of a control terminal according to the on/off command to prevent overshooting of an output voltage.
Patent
Switching power supply unit
TL;DR: In this paper, an inexpensive power supply unit which may be used for video display devices is provided, which saves power when supplying power to a light load, such as during remote control standby Power for a controller which controls each part of a video display device is supplied from the switching power supply.