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Control circuit with clamping function

A technology of control circuit and clamping circuit, which is applied in the field of ammeters, can solve the problems of control power supply being short-circuited to ground, equipment power supply being pulled down, and internal components of the ammeter damaged, etc., so as to avoid the effect of equipment power supply being pulled down

Pending Publication Date: 2019-11-22
NINGBO SANXING MEDICAL & ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There is a problem here. All the IO ports of the MCU will be set high at the moment of power-on or before initialization, and the existing bistable control circuit has no protection function. This may exist. The two output terminals of the bistable circuit Because the input terminals are all set high and connected to the ground, the short circuit of the control power supply to the ground will be pulled down, and then the power supply of the equipment will be pulled down, which may damage the internal components of the meter.

Method used

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  • Control circuit with clamping function
  • Control circuit with clamping function
  • Control circuit with clamping function

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Embodiment Construction

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0022] Such as figure 1 Shown is a schematic structural diagram of an embodiment of the present invention, the control circuit includes a bistable circuit in which the input end is connected to the IO port of the MCU and the output end is connected to a relay, and also includes a bistable circuit arranged between the two input ends of the bistable circuit clamping circuit.

[0023] Such as figure 1 As shown, the bistable circuit in this embodiment includes two PNP transistors V14, V15 and four NPN transistors V9, V11, V12, V13, the emi...

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Abstract

The invention relates to a control circuit with a clamping function. The control circuit comprises a bistable circuit, wherein the input end of the bistable circuit is connected with an IO port of anMCU, and the output end of the bistable circuit is connected with a relay. The control circuit also comprises a clamping circuit disposed between two input ends of the bistable circuit, and the clamping circuit enables a level signal outputted by one IO port to be set to be low when the two IO ports connected with the two input ends are set to be high so as to enable an input signal of the bistable circuit not to be 1 at the same time. The control circuit can prevent the control power supply from being pulled down by short circuit, can improve the operation reliability of the circuit and can prevent equipment from being damaged.

Description

technical field [0001] The invention relates to the technical field of electric meters, in particular to a control circuit with a clamping function. Background technique [0002] As a meter for electricity consumption, the ammeter is widely used in industrial production and life. The display device and other loads of this type of equipment are mostly connected to the MCU through relays. In other words, this type of equipment uses the MCU to control the action mode of the relay to affect and determine the operation of the load. [0003] In this type of mode, there is always a bistable control circuit between the MCU and the relay, that is, the bistable control circuit determines the action of the relay by receiving the IO signal from the MCU, and the control power supply of the bistable control circuit is mostly Powered by the meter's main power supply, which is also often used as a load power supply to power the load. [0004] There is a problem here. All the IO ports of t...

Claims

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Application Information

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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/25257
Inventor 徐跃周中军
Owner NINGBO SANXING MEDICAL & ELECTRIC CO LTD