Digital input signal detection circuit and elevator controller
A technology of digital input and signal detection, which is applied in the direction of digital circuit testing, measuring electricity, measuring electrical variables, etc., can solve the problems of circuit volume increase and detection circuit cost increase, and achieve the effect of volume reduction and cost reduction
Active Publication Date: 2022-07-15
SUZHOU INOVANCE TECH CO LTD
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[0007] The embodiment of the present invention aims at the above-mentioned problem of using multiple channels to meet the requirements of SIL level, which leads to the increase of the cost of the detection circuit and the increase of the circuit volume, and provides a digital input signal detection circuit and an elevator controller
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[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0027] like figure 1 Shown is a schematic diagram of a digital input signal detection circuit provided by an embodiment of the present invention. The digital input signal detection circuit can be used to detect various types of digital signals, thereby improving the accuracy of digital signal detection. For example, this The detection circuit can be applied to the elevator system, and can detect the digital input (DI) signals output by various electrical safety devices (such as safety switches) in the elevator.
[0028] The digital input signal detection circuit of this embodiment include...
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Embodiments of the present invention provide a digital input signal detection circuit and an elevator controller. The detection circuit includes a control unit, a preprocessing unit, and at least one detection unit; the primary side of each detection unit includes a first terminal and a The second terminal, the secondary side of the detection unit includes a third terminal, and the detection unit outputs a preset value through the third terminal when the voltage difference between the first terminal and the second terminal reaches a preset value The first terminal constitutes the input terminal of the digital input signal to be detected; the output terminal of the preprocessing unit is connected to the second terminal, and outputs the first preset pulse signal to the second terminal ; The control unit includes a signal input terminal connected to the third terminal, and the control unit confirms the digital input signal to be detected when the signal of the third terminal is synchronized with the first preset pulse signal efficient. In the embodiment of the present invention, a single channel can meet the SIL certification requirements.
Description
technical field [0001] The invention relates to the field of digital signal processing, and more particularly, to a digital input signal detection circuit and an elevator controller. Background technique [0002] In order to realize the safety function of the elevator, it is necessary to detect the status of the relevant electrical safety devices of the elevator. The status of these electrical safety devices is detected on the circuit board in the form of DI (Digital Input). The national standard of "Safety Specifications for Electrical Manufacturing and Installation" (GB7588.1-201X) specifies the minimum Safety Integrity Level (SIL) requirements that elevator electrical safety devices must meet. The elevator controller is used to detect the status of safety devices. As part of the elevator electrical safety device, the DI circuit also needs to meet the relevant SIL level requirements. [0003] For different SIL levels, certification is required according to the method give...
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IPC IPC(8): G01R31/317B66B5/00B66B1/34
CPCG01R31/31702B66B5/00B66B1/34
Inventor 刘冬利白银河吴红亮
Owner SUZHOU INOVANCE TECH CO LTD