Method and circuit arrangement for identifying the state of a load connected to a circuit terminal
A technology of circuit device and potential terminal, which is applied in the field of load status, can solve the problems of increasing space requirements, complexity, and consumption of logic devices, and achieves the effect of reliable identification.
Active Publication Date: 2022-05-27
ROBERT BOSCH GMBH
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- Abstract
- Description
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- Application Information
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Problems solved by technology
[0007] However, such switching of further additional current sources entails great economical and structural outlay as well as increased space requirements and requires complex logic means for controlling the circuit arrangement, in particular in order to be able to implement corresponding reference potentials and additional current sources. complex and temporally coordinated controls
Method used
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Embodiment Construction
[0051] A preferred embodiment of the circuit arrangement according to the invention is figure 1 shown schematically in , and denoted by 100 .
[0052] A load 102 is connected to the circuit terminal 101 of the circuit device 100 . Furthermore, the load 102 is connected to ground. A capacitor 105 is also connected between the circuit terminal 101 and ground, which acts as a buffer capacitor.
[0053] For example, the circuit arrangement 100 and the load 102 can be used in motor vehicles. The load 102 can be designed, for example, as a windshield heating device. The circuit arrangement 100 can be provided for controlling the windshield heating device and can be integrated into a control unit of the motor vehicle.
[0054] A supply voltage source 104 is connected to the potential terminal 103 . The supply voltage source 104 is designed, for example, as a motor vehicle battery with a voltage value of 12V.
[0055] In this example, the circuit arrangement 100 is arranged in t...
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The invention relates to a method for identifying the state of a load connected to a circuit terminal, wherein a circuit arrangement has: a capacitor between the circuit terminal and ground; a potential terminal connected to a supply voltage source or ground; a switch between the potential terminal and the circuit terminal, It is set up to connect or separate potential terminals and circuit terminals from each other; a reference voltage source is set up to provide a reference potential on the circuit terminals; wherein the switch is opened to separate the potential terminals from the circuit terminals; Provide a reference potential on the ground; determine the measured potential present on the circuit terminals; identify the load state based on the determined measured potential, a first threshold, and a second threshold; where the first threshold is between the value of the supply voltage source voltage and the ground potential, and the second threshold Between the first threshold and the ground potential, the first range between the first threshold and the supply voltage source voltage value and the second range between the ground voltage value and the second threshold are smaller than the range between the first threshold and the second threshold the third range.
Description
technical field [0001] The present invention relates to a method and a circuit arrangement for identifying the state of a load connected to a circuit terminal, as well as a computing unit and a computer program for carrying out the method. Background technique [0002] The circuit arrangement for controlling the load can have a high-side branch or a low-side branch. By means of so-called high-side switches, loads connected to ground can be connected to or disconnected from the supply voltage source. For this purpose, the switching transistors can be provided as corresponding switches, eg MOSFETs. Furthermore, snubber capacitors are often provided in order to ensure electromagnetic compatibility (EMV) of the circuit arrangement. [0003] Such circuit arrangements are frequently used in the automotive field. In a motor vehicle, for example, a load can be provided, which can be controlled by a low-side switch in the output stage of the control device. Such loads can be used...
Claims
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IPC IPC(8): G01R31/40G01R31/26
CPCG01R31/52
Inventor F.I.S.平宗Y.绍韦特
Owner ROBERT BOSCH GMBH