Patent application number | Description | Published |
20100142230 | SIMPLIFIED PRIMARY TRIGGERING CIRCUIT FOR THE SWITCH IN A SWITCHED-MODE POWER SUPPLY - The present invention relates to a trigger circuit for a switch in a switching power supply, especially in a primary-side, triggered switching power supply. The trigger circuit here comprises a feedback signal terminal for detecting an auxiliary voltage induced on a primary-side auxiliary winding of a transformer of the switching power supply, a supply voltage terminal for supplying the trigger circuit with a supply voltage, and a ground terminal for connecting the trigger circuit to a ground potential, wherein the feedback signal terminal is formed by the supply voltage terminal and the auxiliary voltage is superimposed on the supply voltage. Alternatively, the voltage of the auxiliary winding could be superimposed on the voltage on an additional pin that is used for detecting the primary peak current. | 06-10-2010 |
20100201208 | TECHNIQUES FOR REDUCING NO LOAD POWER IN ELECTRONIC DEVICES - Systems and methods (“utility”) are provided for reducing the no-load (standby) power of power devices such as chargers for electronic devices and power converters for electronic devices. The utility may include a controllable switch that is operative to decouple circuitry of the power device from a power source under certain no-load conditions. In one embodiment, the utility provides a switch control module that is operative to sense when an electronic device is coupled to the power device, and in response, to control the switch to couple the power device to the power source. The switch control module may also be operative to detect a condition when the electronic device is no longer drawing power from the power device, and in response, to control the switch to decouple the power device from the power source. | 08-12-2010 |
20120243271 | Power Converter with Reduced Power Dissipation - A power converter with reduced power dissipation at light loads and method of operating the same. In one embodiment, the power converter includes an opto-isolator circuit configured to produce an output signal dependent on an output characteristic of the power converter. The power converter also includes a controller configured to control the output characteristic to a first regulated value when the output signal is greater than or equal to a threshold level, and control the output characteristic to a second regulated value less than the first regulated value when the output signal is less than the threshold level. | 09-27-2012 |
Patent application number | Description | Published |
20100046253 | Control Circuit for a Switched-Mode Power Supply with Regulation Based on the Secondary-Side Current Flow Time Period - A control circuit for a primary controlled switched-mode power supply that has a primary-side switch and a transmitter. It also relates to an associated switched-mode power supply. The control circuit can be connected to a control input of the primary-side switch so that the primary-side switch is controlled based on a secondary-side current flow time period in which a current flows through the secondary-side winding of the transmitter in order to regulate the output voltage. The secondary-side current flow time period can be used as a control parameter instead of the actual output voltage in order to then control the primary-side switch. Because the secondary-side current flow time period can be determined indirectly on the primary side, no direct feedback is necessary between the output voltage on the secondary side and the control circuit on the primary side. | 02-25-2010 |
20100123486 | Driver for a Synchronous Rectifier and Power Converter Employing the Same - A driver for a switch, method of driving a switch, and a power converter employing the same. In one embodiment, the driver for the switch includes a first driver switch coupled to a terminal of the switch. The driver also includes a second driver switch inverted with respect to the first driver switch and coupled to another terminal of the switch, wherein the first and second driver switches are configured to provide a drive signal to a control terminal of the switch. | 05-20-2010 |
20110134664 | Startup Circuit and Power Converter Employing the Same - A startup circuit with reduced power dissipation, method of operating the same and a power converter employing the startup circuit. In one embodiment, the startup circuit for a controller includes a charge accumulation circuit having a resistor series-coupled to a capacitor and a first Schmitt trigger having an input coupled to the capacitor. The startup circuit also includes a second Schmitt trigger having an input coupled to an output of the first Schmitt trigger and configured to provide a bias voltage for the controller via the capacitor when an input voltage thereto exceeds a trip voltage. | 06-09-2011 |
20110182089 | Controller for a Power Converter and Method of Operating the Same - A controller for a power converter and method of operating the same. In one embodiment, the controller includes a primary peak current circuit configured to produce a reference voltage corresponding to a primary peak current through a primary winding of a transformer of a power converter, and an offset corrector configured to provide an offset voltage to compensate for delays in the power converter. The controller also includes a summer configured to provide an offset reference voltage as a function of the reference voltage and the offset voltage, and a comparator configured to produce a signal to turn off a power switch coupled to the primary winding of the transformer as a function of the offset reference voltage. | 07-28-2011 |
20120039098 | Controller for a Power Converter and Method of Operating the Same - A controller for a power converter and method of operating the same. In one embodiment, the controller includes a peak detector, coupled to a circuit element of the power converter, configured to produce a signal corresponding to a peak current through a circuit element. The controller also includes an adjustable reference circuit responsive to a difference between the signal and a reference signal corresponding to a desired peak current to produce a corrected signal corresponding to the peak current. | 02-16-2012 |
20130016535 | Controller for a Power Converter and Method of Operating the Same - A control system for a power converter with reduced power dissipation at light loads and method of operating the same. In one embodiment, the control system includes a first controller configured to control a duty cycle of a power switch to regulate an output characteristic of the power converter. The control system also includes a second controller configured to provide a signal in response to a dynamic change of the output characteristic to the first controller to initiate the duty cycle for the power switch. | 01-17-2013 |
20130194826 | Controller for a Switch and Method of Operating the Same - A controller for a switch and a method of operating the same. In one embodiment, the controller is configured to measure a voltage of a control terminal of the switch and select a first mode of operation if the voltage of the control terminal is greater than a threshold voltage, and a second mode of operation if the voltage of the control terminal is less than the threshold voltage. | 08-01-2013 |
20140254215 | CONTROLLER FOR A POWER CONVERTER AND METHOD OF OPERATING THE SAME - A control system for a power converter with reduced power dissipation and method of operating the same. In one embodiment, the control system includes a first controller coupled to a primary winding of a transformer and configured to control a duty cycle of a power switch to regulate an output characteristic of the power converter. The control system also includes a second controller configured to provide a signal to one of a secondary winding of the transformer and a circuit element spanning an isolation boundary of the transformer in response to a dynamic change of the output characteristic to trigger the first controller to initiate the duty cycle for the power switch. | 09-11-2014 |