System and method having a first and a second operating mode for driving an electronic switch
AssigneeInfineon Technologies Austria AG
InventorMartin Feldtkeller
Life of this patent
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Abstract
An electronic switch is connected in series with a load dependent on an input signal. The electronic switch is operated in a first operation mode for a first time period after a signal level of the input signal has changed from an off-level to an on-level. The first operation mode includes driving the electronic switch dependent on a voltage across the load and dependent on a temperature of the electronic switch. The electronic switch is operated in a second operation mode after the first time period. The second operation mode includes driving the electronic switch dependent on the temperature according to a hysteresis curve.
Claims21
An electronic circuit comprising:
- a drive circuit configured to be coupled to a control terminal of an electronic switch, the drive circuit configured to
- operate the electronic switch in a first operation mode for a first time period, wherein the first time period comprises a time period that starts from when a signal level of an input signal has changed from an off-level to an on-level and ends after an expiration of a first predetermined delay time after the first time period starts, wherein the first operation mode comprises driving the electronic switch dependent on a voltage across a load coupled to the electronic switch and dependent on a temperature of the electronic switch, and
- operate the electronic switch in a second operation mode after the first time period ends, wherein the second operation mode comprises driving the electronic switch dependent on the temperature according to a hysteresis curve.
An electronic circuit comprising:
- a drive circuit configured to be coupled to a control terminal of an electronic switch, the drive circuit configured to
- operate the electronic switch in a first operation mode for a first time period after a signal level of an input signal has changed from an off-level to an on-level, wherein the first operation mode comprises driving the electronic switch dependent on a voltage across a load coupled to the electronic switch and dependent on a temperature of the electronic switch, and
- operate the electronic switch in a second operation mode after the first time period ends, wherein the second operation mode comprises driving the electronic switch dependent on the temperature according to a hysteresis curve, wherein
- the drive circuit in the first operation mode is configured to operate the electronic switch in a first current limiting mode in which the current through the electronic switch is limited to a first current limit, and
- the drive circuit in the first operation mode is further configured to operate the electronic switch in a second current limiting mode in which current through the electronic switch is limited to a second current limit higher than the first current limit, when in the first current limiting mode, the temperature rises above a first temperature threshold and a load voltage meets a first condition.
An electronic circuit comprising:
- a drive circuit configured to be coupled to a control terminal of an electronic switch, the drive circuit configured to
- operate the electronic switch in a first operation mode for a first time period after a signal level of an input signal has changed from an off-level to an on-level, wherein the first operation mode comprises switching the electronic switch off when a temperature of the electronic switch reaches a first temperature threshold, wherein the drive circuit is further configured in the first operation mode to
- operate the electronic switch in a first current limiting mode in which current through the electronic switch is limited to a first current limit, wherein when in the first current limiting mode, the temperature rises above a third temperature threshold and a load voltage meets a first condition, and
- operate the electronic switch in a second current limiting mode in which current through the electronic switch is limited to a second current limit higher than the first current limit;
- and
- operating the electronic switch in a second operation mode after the first time period, wherein the second operation mode comprises driving the electronic switch dependent on the temperature according to a hysteresis curve, wherein the electronic switch is switched off when the temperature of the electronic switch reaches a second temperature threshold lower than the first temperature threshold.
Dependencies are inferred from the claim text.