Half-bridge inverter circuit
AssigneeSanyo Electric Co., Ltd.
InventorsAtsuya Ushida, Kenji Ikeda, Takaaki Saito
Life of this patent
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Abstract
In a drive circuit of a half-bridge inverter circuit, a stable operation cannot be performed at a start-up time and a problem exists such that if a high side output signal is first outputted, main switching elements and are simultaneously turned on. In the present invention, a start-up circuit comprising a latch circuit and a gate circuit are provided, the latch circuit is set while prioritizing a low-side signal, and a low-side output signal is always first made high level, thereby realizing a half-bridge inverter circuit which can start up wit a stability.
Claims4
A half-bridge inverter circuit comprising:
- a switching circuit of a half-bridge type comprising a first main switching element on a high side and a second main switching element on a low side;
- and
- a drive circuit outputting a high side output signal and a low side output signal for driving the switching circuit with a dead time period, the driver circuit comprising a first dead time control circuit on the high side and a second dead time control circuit on the low side, the first and second dead time control circuits cooperating to produce the dead time period,
- the driver circuit further comprising a start-up circuit comprising a latch circuit that is reset upon detection of a rise in power supply on the low side at start-up of the inverter circuit and is set by the low side output signal from the second dead time control circuit, and a gate circuit allowing the high side output signal from the first dead time control circuit to pass after receiving the low side output signal in response to an output from the latch circuit.
Dependencies are inferred from the claim text.