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Method and control circuit for controlling a transistor

A technology for controlling transistors and control circuits, applied in transistors, circuits, electronic switches, etc., can solve problems such as reducing efficiency

Active Publication Date: 2019-09-27
INFINEON TECH AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this has the result that the transistor is then also actuated with a reduced control voltage during the waiting time if the short-circuit monitoring does not indicate a short-circuit
which in turn results in operating at reduced efficiency

Method used

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  • Method and control circuit for controlling a transistor
  • Method and control circuit for controlling a transistor
  • Method and control circuit for controlling a transistor

Examples

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Embodiment Construction

[0029] figure 1 A control structure is shown schematically with a transistor 30 , a control circuit 100 for controlling the transistor 30 , as well as a load 50 and a short-circuit monitoring unit 40 . This transistor 30 has a load line C-E and a control terminal G via which the current through the load line C-E can be controlled. The load 50 is connected in series with the load line C-E between terminals of corresponding supply potentials (here only exemplary positive supply potential V+ and negative supply potential or reference potential GND). This supply potential can generally be chosen arbitrarily, for example the difference V+ minus V- is always positive, or it is always positive and otherwise constant, but it can also change its sign in the temporal behavior, for example In this case, when the transistors and other switches form a half-bridge, where the load is connected to the switch node of the half-bridge.

[0030] A control circuit 100 for controlling the transis...

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Abstract

The subject of the invention relates to a method for controlling a transistor. The transistor has a control terminal and a load line. The control circuit has a logic unit and a control signal generator. The control signal generator outputs a time-varying control voltage to control the transistor. The control signal generator obtains target state information according to which the transistor is turned on or kept, or turned off or kept. A first short circuit information signal is transmitted to the control signal generator, which includes information about the potential presence of a short circuit to the electrical load. By means of which it sets the control voltage to a value or value range above the switch-on threshold, but limited to a first maximum switch-on voltage limit, the control signal generator switches on the transistor at a first point in time. The control signal generator decides whether to keep the control voltage limited to a maximum of the first switch-on voltage limit or whether to regulate the control voltage of the transistor to a value greater than or equal to a second switch-on voltage threshold greater than the first switch-on voltage limit or range of values.

Description

technical field [0001] The invention relates to a method for controlling a transistor, and a control circuit for a transistor. In particular, the transistor can be used for switching electrical loads. Background technique [0002] Transistors are widely used as electrical switches. Due to their high switching frequency, at which the transistor is able to operate, the transistor is suitable not only as a "static" switch, which is off for extended periods of time, such as seconds, minutes or hours, but also The load can be controlled periodically or pulsed. [0003] Periodically or pulse-controlled transistors are used, for example, in circuits for driving inductive loads, for example in half-bridge or full-bridge drives of electric motors, solenoid valves or the like. Further areas of use are switching converters or switching power supplies, in which the transistors are cyclically controlled to regulate the current consumption and thus the output voltage. But the inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/082H03K17/60
CPCH03K17/0826H03K17/60H03K17/08128H03K17/162H03K17/168
Inventor R·拜雷尔J·G·拉文
Owner INFINEON TECH AG
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