Pulse counting circuit

Abstract

The utility model discloses a pulse counting circuit, comprising an input module for inputting a 5V voltage; the high voltage prevention input module is used for preventing high voltage input, and the high voltage prevention input module is connected with the input end of the input module; the false triggering prevention module is used for preventing false triggering, and the false triggering prevention module is connected with the input end of the input module; the output module is used for outputting a 5V voltage; the output end of the anti-high-voltage input module and the output end of the anti-false-triggering module are connected with the output module. The circuit has a high-voltage input prevention function, can prevent equipment from being burnt by high voltage, has a false triggering prevention function, starts to work only when the voltage is higher than a certain value, and is better in safety.

Description

Technical Field

[0001] The utility model relates to the counting field of pulse counting circuits, in particular to a pulse counting circuit. Background Art

[0002] The electric meter will output pulses through the optocoupler. The pulses are connected to the pulse counter to check whether the pulse count and calibration pulse frequency are correct. When high voltage input is generated, the docking connection equipment will be burned. In addition, there is no false trigger design in the pulse counting circuit, and it is easy to be accidentally triggered and turned on. Based on this, a pulse counting circuit is designed. Utility Model Content

[0003] In order to overcome at least one defect of the above-mentioned prior art, the utility model provides a pulse counting circuit. It has a high voltage input protection function, which can prevent high voltage from burning equipment, and has a false trigger protection function. It only starts working when the voltage is higher than a certain value, which is safer.

[0004] The technical solution adopted by the utility model to solve the problem is:

[0005] A pulse counting circuit comprises: an input module, which inputs a 5V voltage; an anti-high-voltage input module, which is used to prevent high-voltage input and is connected to the input end of the input module; an anti-false triggering module, which is used to prevent false triggering and is connected to the input end of the input module; an output module, which outputs a 5V voltage; the output end of the anti-high-voltage input module and the output end of the anti-false triggering module are connected to the output module.

[0006] By adopting the above solution, the function of preventing high voltage input can be achieved, which can prevent high voltage from burning the equipment, and the function of preventing false triggering can be achieved. It will only start working when the voltage is higher than a certain value, which is safer.

[0007] Furthermore, the first input end of the input module is connected to the second output end of the output module via a first connection circuit, and the second input end of the input module is connected to the second output end of the output module via a second connection circuit.

[0008] Furthermore, the high-voltage input protection module includes a first resettable fuse and a second resettable fuse, the first resettable fuse is connected in series to the first connection circuit, and the second resettable fuse is connected in series to the second connection circuit.

[0009] By adopting the above solution, the first resettable fuse and the second resettable fuse are used to protect the equipment connected to the back end to prevent high voltage input.

[0010] Furthermore, the first input end of the input module is connected to the third output end of the output module via a third connecting circuit, and the third connecting circuit is connected in series with a third transistor, a tenth resistor, and a second transistor in sequence.

[0011] Furthermore, the anti-false triggering module includes a diode, and the diode is connected in series to the third connecting circuit.

[0012] By adopting the above solution, the conduction characteristic of the diode is utilized to prevent false triggering.

[0013] Furthermore, the diode is a Zener diode.

[0014] By adopting the above scheme, the current of the Zener diode can be changed in a wide range while the voltage remains basically unchanged, so as to manufacture a diode for voltage stabilization.

[0015] Furthermore, a sixth resistor and a fourth transistor are sequentially connected in series in the first connection circuit.

[0016] By adopting the above solution, the PNP conductive characteristic of the fourth transistor is utilized to isolate the power supply part.

[0017] Furthermore, the second connection circuit is connected in series with a third resistor, a first transistor and a fourth resistor in sequence.

[0018] By adopting the above solution, the NPN conductive characteristic of the first transistor is utilized to isolate the power supply part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A circuit diagram of an embodiment of the utility model;

[0020] Among them, the meanings of the figure marks are as follows: 1. input module; 11. first input terminal; 12. second input terminal; 2. anti-high voltage input module; 21. first self-recovery fuse; 22. second self-recovery fuse; 3. anti-false triggering module; 31. diode; 4. output module; 41. second output terminal; 42. third output terminal; 5. first connecting circuit; 51. sixth resistor; 52. fourth transistor; 6. second connecting circuit; 61. third resistor; 62. first transistor; 63. fourth resistor; 7. third connecting circuit; 71. third transistor; 72. tenth resistor; 73. second transistor. DETAILED DESCRIPTION

[0021] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] In order to facilitate the understanding of the embodiments of the present utility model, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] See also Figure 1 The utility model discloses a pulse counting circuit: comprising an input module 1, an anti-high-voltage input module 2, an anti-false trigger module and an output module 4, wherein the input module 1 inputs a 5V voltage, the anti-voltage input module 1 is used to prevent high-voltage input, the anti-high-voltage input module 2 is connected to the input end of the input module 1, the anti-false trigger module 3 is used to prevent false triggering, the anti-false trigger module is connected to the input end of the input module 1, the output module 4 outputs a 5V voltage, and the output end of the anti-high-voltage input module 2 and the output end of the anti-false trigger module 3 are connected to the output module 4. It has the function of preventing high-voltage input, which can prevent high voltage from burning the equipment, and has the function of preventing false triggering, which only starts to work when the voltage is higher than a certain value, and has better safety.

[0026] The first input terminal 11 of the input module 1 is connected to the second output terminal 41 of the output module 4 via a first connecting circuit 5 , and the second input terminal 12 of the input module 1 is connected to the second output terminal 41 of the output module 4 via a second connecting circuit 6 .

[0027] Specifically, the anti-high-voltage input module 2 includes a first self-resetting fuse 21 and a second self-resetting fuse 22. The first self-resetting fuse 21 is connected in series to the first connection circuit 5, and the second self-resetting fuse 22 is connected in series to the second connection circuit 6. The first self-resetting fuse 21 and the second self-resetting fuse 22 are used to protect the equipment connected to the back end to prevent high-voltage input.

[0028] Specifically, the first input terminal 11 of the input module 1 is connected to the third output terminal 42 of the output module 4 through the third connection circuit 7, and the third transistor 71, the tenth resistor 72 and the second transistor 73 are sequentially connected in series on the third connection circuit 7. The anti-false triggering module 3 includes a diode 31, and the diode 31 is connected in series to the third connection circuit 7. The conduction characteristic of the diode 31 is used to prevent false triggering. The diode 31 is a Zener diode 31. The current of the Zener diode 31 can change in a wide range while the voltage is basically unchanged, so the diode 31 with a voltage stabilizing effect is made. In this embodiment, the diode 31 is a 2V diode 31.

[0029] Among them, the first connection circuit 5 is connected in series with a sixth resistor 51 and a fourth transistor 52 in sequence, and the PNP conductive characteristic of the fourth transistor 52 is used to isolate the power supply part, and the second connection circuit 6 is connected in series with a third resistor 61, a first transistor 62 and a fourth resistor 63 in sequence, and the NPN conductive characteristic of the first transistor 62 is used to isolate the power supply part.

[0030] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A pulse counting circuit, characterized in that: include: An input module, wherein the input module inputs a 5V voltage; A high-voltage input prevention module, which is used to prevent high-voltage input and is connected to the input end of the input module; An anti-false triggering module, the anti-false triggering module is used to prevent false triggering, and the anti-false triggering module is connected to the input end of the input module; An output module outputs a 5V voltage; the output end of the anti-high-voltage input module and the output end of the anti-false trigger module are connected to the output module.

2. A pulse counting circuit according to claim 1, characterized in that: The first input end of the input module is connected to the second output end of the output module via a first connecting circuit, and the second input end of the input module is connected to the second output end of the output module via a second connecting circuit.

3. A pulse counting circuit according to claim 2, characterized in that: The high-voltage input protection module includes a first resettable fuse and a second resettable fuse, wherein the first resettable fuse is connected in series to the first connection circuit, and the second resettable fuse is connected in series to the second connection circuit.

4. A pulse counting circuit according to claim 3, characterized in that: The first input end of the input module is connected to the third output end of the output module via a third connecting circuit, and the third transistor, the tenth resistor and the second transistor are sequentially connected in series on the third connecting circuit.

5. A pulse counting circuit according to claim 4, characterized in that: The anti-false triggering module includes a diode, and the diode is connected in series to the third connecting circuit.

6. A pulse counting circuit according to claim 5, characterized in that: The diode is a Zener diode.

7. A pulse counting circuit according to claim 6, characterized in that: The first connection circuit is serially connected with a sixth resistor and a fourth transistor.

8. A pulse counting circuit according to claim 7, characterized in that: The second connection circuit is connected in series with a third resistor, a first transistor and a fourth resistor.

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