Fault detection device and method for switch driving circuit, and electronic device
AssigneeMurata Manufacturing Co., Ltd.
InventorsQiang Li, Xiaojun Wang
Life of this patent
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Abstract
A DC-to-DC converter includes at least one primary switch, a primary inductor, and a switch rectifier circuit or a switch flyback circuit. A switch driving circuit is structured to drive the at least one primary switch. A fault detection method includes directly or indirectly detecting a voltage waveform or a current waveform of at least one terminal of the primary inductor, and determining whether the at least one primary switch is in a diode rectifying state or in a diode flyback state based on the voltage waveform or the current waveform to detect whether there is a fault in the switch driving circuit.
Claims12
A fault detection method for a switch driving circuit of a Direct Current (DC)-to-DC converter, wherein the DC-to-DC converter includes at least one primary switch, a primary inductor, and a switch rectifier circuit or a switch flyback circuit, the switch driving circuit is structured to drive the at least one primary switch, the at least one primary switch is connected to the primary inductor, the method comprising:
- detecting a voltage waveform or a current waveform of at least one terminal of the primary inductor by detection circuitry;
- determining whether a duration of a low level in the voltage waveform meets a predetermined condition by determination circuitry;
- and
- if the duration of the low level in the voltage waveform meets the predetermined condition, determining, by the determination circuitry, that a fault in the switch driving circuit occurred when the at least one primary switch is in a diode rectifying state wherein the DC-to-DC converter includes the switch rectifier circuit, or the at least one primary switch is in a diode flyback state wherein the DC-to-DC converter includes the switch flyback circuit.
A fault detection device for a switch driving circuit of a Direct Current (DC)-to-DC converter including at least one primary switch, a primary inductor, and a switch rectifier circuit or a switch flyback circuit, the switch driving circuit being structured to drive the at least one primary switch, the at least one primary switch being connected to the primary inductor, the fault detection device comprising:
- a detection circuitry to detect a voltage waveform or a current waveform of at least one terminal of the primary inductor;
- and
- a determination circuitry to determine whether a duration of a low level in the voltage waveform meets a predetermined condition, wherein
- if the duration of the low level in the voltage waveform meets the predetermined condition, the determination circuitry determines that a fault in the switch driving circuit occurred when the at least one primary switch is in a diode rectifying state wherein the DC-to-DC converter includes the switch rectifier circuit, or the at least one primary switch is in a diode flyback state wherein the DC-to-DC converter includes the switch flyback circuit.
Dependencies are inferred from the claim text.