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Control input protection circuit for electrical equipment

A technology for controlling input terminals and protecting circuits, applied in overvoltage-responsive protection, logic circuit coupling devices, logic circuit interface devices, etc., can solve the problems of increasing the size of the resistor structure and occupying valuable space for equipment, etc., to achieve Avoid heating effects of electrical components

Active Publication Date: 2020-06-02
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the physical size of the resistor also increases, which then takes up valuable space in the device

Method used

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  • Control input protection circuit for electrical equipment
  • Control input protection circuit for electrical equipment

Examples

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Embodiment Construction

[0017] figure 1 A block diagram of a possible embodiment of a control input protection circuit 1 for an electrical component 10 is shown.

[0018] The electrical component 10 has a control input, to which an actuation signal AS, for example a sensor signal or an audio signal, can be applied. The control input 11 is formed by the combination of an input terminal 11 and a reference potential terminal 12 , here circuit ground, which is connected here to a vehicle ground 13 . The drive signal AS is applied as an input voltage signal Ue between the input terminal 11 and the reference potential terminal 12 . Here, the italicized spelling of the formula symbol Ue is chosen to represent the drive signal with an AC component, that is, a non-DC signal.

[0019] A series circuit consisting of an ohmic resistor R and an electrically controlled switch S is connected between the input terminal 11 and the reference potential terminal. The switch is configured as a normally closed contact,...

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PUM

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Abstract

The application proposes a control input protection circuit (1) for an electrical component (10) having a control input (11) arranged to receive an electrical drive Signal (AS), wherein the control input (11) is connected to the reference potential (12, 13) via a resistor (R), wherein in the signal path between the control input (11) and the reference potential (12, 13) , an electrically controlled switch (S) is connected in series with the resistor (R), wherein the switch (S) can be controlled by a controller (15), wherein the controller (15) is arranged to change the voltage of the drive signal (AS) The value is compared with a predetermined limit value and a control signal (16) for opening the switch (S) is generated when the voltage value exceeds the limit value.

Description

technical field [0001] The invention relates to a control input protection circuit for electric equipment. Background technique [0002] The control input of the device is usually closed with respect to the reference potential by means of a dc-coupling resistor, i.e. connected to the reference potential, e.g. circuit ground, by means of an ohmic resistor, in order to reach the defined in the absence of a drive signal for the control input electrical state. These so-called pull-down (or pull-up) resistors must be sized according to the power loss in these resistors generated by the drive signal. The structural size of the resistor depends primarily on the maximum power loss to be achieved. [0003] It is common in automotive applications to design all control inputs of the device in such a way that even with the full vehicle battery voltage applied (currently typically 12V in passenger cars and 24V in trucks) result in destruction of the control input. This requirement me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20
CPCH02H3/20G11C7/02H03K19/0008H03K19/017509H03K19/017545
Inventor T·克鲁格
Owner ROBERT BOSCH GMBH
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