Abnormal switching monitoring device and abnormal switching monitoring method
AssigneeFairchild Korea Semiconductor Ltd.
InventorsHyun-Chul EOM, Jin-Tae KIM, Gwan-Bon KOO
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Abstract
The present invention relates to an abnormal switching monitoring device and method. A time point when a high-side switch in which a first electrode receives an input voltage is turned on, a time point when a low-side switch that is connected to a second electrode of the high-side switch is turned on, a time point when a charge current begins to flow to a bootstrap circuit, and a time point when a charge current stops flowing to the bootstrap circuit are compared so as to determine whether or not non-zero voltage switching occurs. The bootstrap circuit supplies an operating current to a gate driver controlling a switching operation of the high-side switch.
Claims18
An abnormal switching monitoring device monitoring abnormal non-zero voltage switching of a low-side switch connected to a second electrode of a high-side switch including a first electrode receiving an input voltage, the abnormal switching monitoring device comprising
- a bootstrap circuit supplying an operating current to a gate driver controlling a switching operation of the high-side switch, wherein
- the abnormal switching monitoring device compares a time point when a current begins to flow through the bootstrap circuit with a time point when the low-side switch is turned on so as to determine whether or not non-zero voltage switching of the low side switch occurs.
An abnormal switching monitoring device monitoring abnormal non-zero voltage switching of the high-side switch including a first electrode receiving an input voltage, the abnormal switching monitoring device comprising
- a bootstrap circuit supplying an operating current to a gate driver controlling a switching operation of the high-side switch, wherein
- a time point when the current does not flow through the bootstrap circuit is compared with a time point when the high-side switch is turned on so as to determine whether or not non-zero voltage switching of the high-side switch occurs.
An abnormal switching monitoring method monitoring non-zero voltage switching of a low-side switch connected to a second electrode of a high-side switch including a first electrode receiving an input voltage, the method comprising:
- monitoring a charge current charging a bootstrap capacitor that supplies an operating current to a gate driver controlling a switching operation of the high-side switch;
- comparing a time point when the low-side switch is turned on with a time point when the charge current begins to flow;
- and
- determining whether or not non-zero voltage switching of the low-side switch occurs according to the comparison result.
An abnormal switching monitoring method monitoring non-zero voltage switching of a high-side switch including a first electrode receiving an input voltage, the method comprising:
- monitoring a charge current charging a bootstrap capacitor that supplies an operating current to a gate driver controlling a switching operation of the high-side switch;
- comparing a time point when the high-side switch is turned on with a time point when the charge current stops flowing;
- and
- determining whether or not non-zero voltage switching of the high-side switch occurs according to the comparison result.
Dependencies are inferred from the claim text.