Patent
Flyback charging with current mode controlled flyback converter
TLDR
In this article, a flyback charger for an energy-storage capacitor has a controller for causing the energy storage pulses of current in the transformer primary winding and the energy delivery pulses in the secondary winding to be nearly flat-topped.Abstract:
A flyback charger for an energy-storage capacitor has a controller for causing the energy-storage pulses of current in the transformer primary winding and the energy-delivery pulses of current in the transformer secondary winding to be nearly flat-topped. The controller includes a peak-current-commanding current-mode control or a valley-current-commanding current-mode control which controls the duration of a switching circuit on and off interval, respectively, responsive to the current flowing in the transformer primary winding and secondary winding, respectively. A feed-forward controller controls the duration of the switching circuit off and on interval, respectively, in response to the voltage provided by the secondary winding and D-C supply voltage, respectively. When using the valley-current-commanding current-mode controller, there may be a fixed duration of the switching circuit on interval.read more
Citations
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Patent
One pin error amplifier and switched soft-start for an eight pin PFC-PWM combination integrated circuit converter controller
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Patent
Interleaved zero current switching in a power factor correction boost converter
Jeffrey Hwang,Thomas Li +1 more
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Patent
Two-stage switching regulator having low power modes responsive to load power consumption
Jeffrey Hwang,Alland Chee +1 more
TL;DR: In this paper, a two-stage switching regulator with low power modes responsive to load power consumption is proposed. But switching in either one or both of the stages is disabled by the duty cycle for the corresponding switch falling to zero when a load draws a high level of current.
Patent
Input current modulation for power factor correction
Jeffrey H. Hwang,Wing-Hung Ki +1 more
TL;DR: A nonlinear carrier controlled power factor correction circuit operates in the continuous and discontinuous conduction modes and provides unity power factor at the input of a power supply by only sensing the output voltage and the current flowing through a diode of a rectifier circuit as mentioned in this paper.
References
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Patent
Current mode converter with controlled slope compensation
TL;DR: In this paper, a current mode converter with continuously variable optimized slope compensation and improved power factor is presented, where a ramp signal is generated with a slope that is determined by the loading of the converter.
Patent
Constant current series-switching regulator
TL;DR: In this paper, a series switch regulator adjusts the flow of input power by switching ON and OFF, in response to a control signal, and the duty cycle depends on the power demands of the load.
Patent
A dc to dc converter adjustable dynamically to battery condition
TL;DR: In this paper, a battery-powered DC-to-DC converter is adjustable in response to the condition of the battery so that an optimum compromise is made between the performance of battery and performance of the converter in an application such as charging an electronic strobe flash unit capacitor.
Patent
Flyback feedforward pulse width modulation regulator
TL;DR: In this paper, a flyback feed forward circuit for a pulse width modulated DC power supply was proposed, in which the duty cycle was determined by varying the slope and peak amplitude of the sawtooth waveform under the influence of a weighted sum of input and output voltages.
Patent
Charging circuits using controlled magnetic fields
TL;DR: In this article, a sensing circuit detects a desired maximum value of the magnetic field and then operates a switch to disconnect the primary winding from the source of energy, so as to permit only a partial magnetic field drop before commencing the next cycle.