-
公开(公告)号：US10720834B2
公开(公告)日：2020-07-21
申请号：US16387762
申请日：2019-04-18
Applicant: Raydium Semiconductor Corporation
Inventor： Pei-Kai Tseng , Chen-Pin Lo , Shen-Xiang Lin , Chih-Jen Hung
IPC: G05F1/10 , H02M3/07 , G09G3/3208
Abstract: A charge pump, applied to an OLED display panel and coupled to an output capacitor, includes a first switch to a tenth switch and a first capacitor to a third capacitor. The first switch and second switch are coupled in series between a first voltage and a second voltage lower than first voltage. The third switch is coupled to second voltage. The sixth switch is coupled to first voltage. The seventh switch is coupled to second voltage. The fourth switch, eighth switch and tenth switch are coupled to output capacitor. The first capacitor is coupled between first switch and second switch. The second capacitor is coupled between fifth switch and sixth switch. The third capacitor is coupled between seventh switch and eighth switch. The charge pump is operated in a first phase, a second-A phase, the first phase and a second-B phase in order to provide negative output voltage.
-
Patent Agency Ranking
公开(公告)号：US10608533B2
公开(公告)日：2020-03-31
申请号：US16412666
申请日：2019-05-15
Applicant: Raydium Semiconductor Corporation
Inventor： Shen-Xiang Lin , Hsuan-Hao Chien , Chih-Jen Hung
Abstract: A time multiplexing circuit applied to a DC-DC converting system including first to third NOR gates, first and second inverters, first and second D-type flip-flops, a NAND gate, an OR gate and an AND gate. The first NOR gate and second NOR gate receive the first and second pulse-width modulation signals respectively and output a boost state request signal and a buck-boost state request signal respectively. The first D-type flip-flop outputs a first time multiplex output signal and a first reverse time multiplex output signal. The second D-type flip-flop outputs a second time multiplex output signal and a second reverse time multiplex output signal. The third NOR gate outputs another first time multiplex output signal. The NAND gate outputs another second time multiplex output signal. The OR gate outputs a first reverse output signal. The AND gate outputs a second reverse output signal.
-
公开(公告)号：US10938379B2
公开(公告)日：2021-03-02
申请号：US16903433
申请日：2020-06-17
Applicant: Raydium Semiconductor Corporation
Inventor： Ji-Ting Lai , Shen-Xiang Lin , Chih-Jen Hung
Abstract: An automatic frequency modulation circuit and an automatic frequency modulation method using efficiency statistics as a reference for frequency modulation applied to a pulse-width modulation (PWM) system are disclosed. The automatic frequency modulation circuit includes an oscillator unit, an on-time generating unit, a frequency adjusting unit and a frequency selecting unit. The oscillator unit receives a reference current and generate a clock signal. The on-time generating unit, coupled to the oscillator unit, receives a reference voltage and a first voltage of the oscillator unit and generates an on-time signal. The frequency adjusting unit, coupled to the on-time generating unit, receives the on-time signal and a PWM signal and generates a frequency adjusting signal. The frequency selecting unit is coupled to the frequency adjusting unit and automatically adjusts an original frequency according to the frequency adjusting signal to generate an adjusted frequency.
-
公开(公告)号：US10541599B2
公开(公告)日：2020-01-21
申请号：US16412614
申请日：2019-05-15
Applicant: Raydium Semiconductor Corporation
Inventor： Shen-Xiang Lin , Hsuan-Hao Chien , Chih-Jen Hung
Abstract: A soft-start control circuit includes first to third inverters, first to third comparators, first to fourth resistors, first to fourth D-type flip-flops and a NOR gate. The first comparator outputs a first trigger signal. The second comparator outputs a second trigger signal. The third comparator outputs a third trigger signal. The first D-type flip-flop outputs a first error amplification ready signal. The second D-type flip-flop outputs a second error amplification ready signal. The third D-type flip-flop outputs a high-level output voltage ready signal. The fourth D-type flip-flop outputs a low-level output voltage ready signal. The NOR gate receives an inverted signal of a high-level output voltage enable signal and the third trigger signal and outputs a high-level output voltage control signal to prevent an inrush current of the DC-DC conversion system during a startup process.
-
公开(公告)号：US10277121B2
公开(公告)日：2019-04-30
申请号：US16052204
申请日：2018-08-01
Applicant: Raydium Semiconductor Corporation
Inventor： Pei-Kai Tseng , Li-Chieh Chen , Chih-Jen Hung
IPC: H02M1/00 , H02M3/07 , G01R19/165
Abstract: A charge pump circuit includes a first switch˜a fourth switch, a capacitor, a current source, a first resistor, a second resistor, an amplifier, another current source, a current mirror, a skip detection circuit, a switch generation circuit and a control unit. A method includes: (a) starting the charge pump circuit; (b) operating the charge pump circuit in a first phase, wherein the first switch and second switch are conducted and the third switch and fourth switch are disconnected; (c) operating the charge pump circuit in a second phase, wherein the third switch and fourth switch are conducted and the first switch and second switch are disconnected; (d) determining whether a detected voltage in the skip detection circuit is higher than a threshold voltage; and (e) selectively performing step (b) or (c) again according to determination result of step (d).
-
公开(公告)号：US10257898B2
公开(公告)日：2019-04-09
申请号：US15808679
申请日：2017-11-09
Applicant: Raydium Semiconductor Corporation
Inventor： Hsuan-Hao Chien , Shen-Xiang Lin , Chih-Jen Hung
Abstract: A LED driving apparatus including a power converter, a judging module and a control module is disclosed. The power converter and the judging module are coupled to at least one LED respectively. The control module is coupled to the judging module. The control module includes a current source and a transconductance amplifier. The current source is coupled to an output terminal of the transconductance amplifier. The power converter converts an input voltage into an output voltage and transmits the output voltage to the at least one LED. The judging module judges whether a LED current is changed from a first LED current value to a second LED current value. If yes, the judging module generates a judging signal to the control module. The control module changes a current value of the current source and a transconductance of the transconductance amplifier.
-
-
-
-
-
Search Results
6
records
(took 0.012 seconds)
