# US 11,121,618 B2 · Power switching circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,618 B2 - Document ID: US11121618B2 - Status: Granted - Kind: B2 - Application number: 16/699,086 - Filed: 2019-11-28 - Published: 2020-09-24 - Granted: 2021-09-14 - Earliest claimed: 2019-03-20 - Assignees: uPI Semiconductor Corp. - Applicants: uPI Semiconductor Corp. - Inventors: Chih-Wen Hsiao; Wen-Chieh Tsai - Web page: https://patentgrep.com/patent/US11121618B2 ## CPC - H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters - H02M 1/38: Means for preventing simultaneous conduction of switches - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H03K 17/0828: {in composite switches} - H03K 17/162: {without feedback from the output circuit to the control circuit} - H03K 17/693: Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors (logic circuits H03K19/00; code converters H03M5/00, H03M7/00) - H03K 19/0944: using MOSFET {or insulated gate field-effect transistors, i.e. IGFET}(H03K19/096 takes precedence) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## Abstract The disclosure provides a power switching circuit. The power switching circuit includes a driving circuit, a determining circuit, a first power switch, and a second power switch. The driving circuit outputs a first driving signal and a second driving signal. The determining circuit is coupled to the driving circuit and outputs a control signal to the driving circuit. The first power switch is coupled to a first input voltage and receives the first driving signal. The second power switch is coupled to a second input voltage and receives the second driving signal. When the first power switch and the second power switch are switched, the second driving signal rises from a first level to a preset level, and the determining circuit controls the driving circuit to utilize the first driving signal to turn off the first power switch. ## Claims ### Claim 1 A power switching circuit, comprising: a driving circuit, outputting a first driving signal and a second driving signal; a determining circuit, coupled to the driving circuit and outputting a control signal to the driving circuit; a first power switch, coupled to a first input voltage and receiving the first driving signal; and a second power switch, coupled to a second input voltage and receiving the second driving signal, wherein when the first power switch and the second power switch are switched, the second driving signal rises from a first level to a preset level, and the determining circuit controls the driving circuit to utilize the first driving signal to turn off the first power switch, wherein the determining circuit comprises a sensing circuit and a dead time control circuit, wherein the sensing circuit comprises a driving signal selector and a comparator, the driving signal selector receives the first driving signal and the second driving signal, a first input terminal of the comparator is coupled to the driving signal selector, and a second input terminal of the comparator is coupled to a preset voltage. ### Claim 2 (depends on 1) The power switching circuit of claim 1, wherein the dead time control circuit comprises: a flip-flop, wherein a first input terminal thereof receives a switching signal, a reset terminal thereof receives a sensing signal outputted by the sensing circuit, a second input terminal thereof receives another switching signal, a first output terminal thereof outputs a first output signal, and a second output terminal thereof outputs a second output signal; a first OR gate, wherein a first input terminal thereof receives the another switching signal, a second input terminal thereof is coupled to the first output terminal of the flip-flop, and an output terminal thereof outputs a first control signal; and a second OR gate, wherein a first input terminal thereof is coupled to the second output terminal of the flip-flop, a second input terminal thereof receives the switching signal, and an output terminal thereof outputs a second control signal. ### Claim 3 (depends on 1) The power switching circuit of claim 1, wherein the dead time control circuit further comprises: an inverter, wherein an input terminal thereof receives a switching signal and an output terminal thereof outputs another switching signal. ### Claim 4 (depends on 1) The power switching circuit of claim 1, wherein when the second driving signal rises from the first level to the preset level, the determining circuit controls the driving circuit to turn on the second power switch through the second driving signal. ### Claim 5 (depends on 1) The power switching circuit of claim 1, wherein the first power switch and the second power switch are coupled to an output terminal of the power switching circuit, and one of the first power switch and the second power switch provides an output voltage to the output terminal after being turned on. ### Claim 6 (depends on 1) The power switching circuit of claim 1, wherein the second input voltage and the first input voltage are at different voltage levels.