Pedal switch signal protection circuit

Abstract

The utility model relates to the technical field of foot switches, and discloses a foot switch signal protection circuit used for protecting signal transmission between a foot switch and a processor, the protection circuit comprises an overvoltage protection circuit and an optoelectronic isolation circuit, a foot switch signal is input to the overvoltage protection circuit, and the optoelectronic isolation circuit is connected with the overvoltage protection circuit. And the signals are transmitted to the processor after passing through the photoelectric isolation circuit. The pedal switch can solve the problems that in the prior art, a signal circuit of a pedal switch is simple and poor in stability, some misoperation of the pedal switch can be caused, and certain risks exist.

Description

Technical Field

[0001] The utility model relates to the technical field of foot switches, in particular to a foot switch signal protection circuit. Background Art

[0002] A foot switch is a switch that switches a circuit on and off by pedaling. It's often used in control circuits that are out of reach of both hands, replacing or freeing up hands. Both ultrasonic and electrosurgical scalpels require a foot switch, allowing surgeons to activate the surgical instrument using either the handpiece or the foot switch. Because surgeons often rely on their hands for manual manipulation, which makes activating surgical instruments inconvenient, foot switches are crucial.

[0003] In the prior art, the signal circuit of the foot switch is relatively simple and has poor stability. For example, overvoltage, electromagnetic interference, etc. may cause the foot switch to malfunction, which poses certain risks. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a foot switch signal protection circuit to solve the problem in the prior art that the signal circuit of the foot switch is relatively simple and has poor stability, which may cause some malfunctions of the foot switch and pose certain risks.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] A foot switch signal protection circuit is used to protect the signal transmission between the foot switch and the processor. The protection circuit includes an overvoltage protection circuit and a photoelectric isolation circuit. The foot switch signal is input to the voltage protection circuit and transmitted to the processor after passing through the photoelectric isolation circuit.

[0007] Furthermore, the overvoltage protection circuit includes a gas discharge tube, one end of which is connected to the foot switch circuit, and the other end of which is connected to one end of the photoelectric isolation circuit.

[0008] Furthermore, the photoelectric isolation circuit includes an optical coupler, one end of the optical coupler is connected to one end of the overvoltage protection circuit, and the other end is connected to the processor circuit.

[0009] Furthermore, a common-mode interference suppression circuit is connected between the overvoltage protection circuit and the photoelectric isolation circuit.

[0010] Furthermore, the common-mode interference suppression circuit includes a common-mode inductor filter, one end of which is connected to one end of the overvoltage protection circuit, and the other end of which is connected to one end of the optoelectronic isolation circuit.

[0011] Furthermore, an electrostatic protection circuit is provided between the common-mode interference suppression circuit and the photoelectric isolation circuit.

[0012] Furthermore, the electrostatic protection circuit includes an ESD electrostatic protector, one end of the ESD electrostatic protector is connected to one end of the common mode interference suppression circuit, and the other end is connected to one end of the photoelectric isolation circuit.

[0013] Beneficial effects of the utility model:

[0014] 1. By setting up an overvoltage protection circuit, when an overvoltage occurs, the voltage protection circuit will guide the surge current to the ground, thereby protecting subsequent electronic equipment from overvoltage damage and reducing the impact of overvoltage on the foot switch signal transmission. By setting up an optoelectronic isolation circuit, while ensuring signal transmission, it can also protect electronic equipment from electrical shock and damage and suppress system noise.

[0015] 2. By setting up a common-mode interference suppression circuit, common-mode electromagnetic interference signals are filtered and suppressed, while improving signal quality and system reliability. By limiting the flow of common-mode current, the propagation of common-mode noise is reduced, thereby reducing ground loop interference.

[0016] 3. By setting up an electrostatic protection circuit, the foot switch circuit can be prevented from being damaged by the electrostatic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural block diagram of a foot switch signal protection circuit of the utility model;

[0018] Among them, 1. Foot switch; 2. Processor; 3. Gas discharge tube; 4. Common mode inductor filter; 5. ESD electrostatic protector; 6. Optocoupler. DETAILED DESCRIPTION

[0019] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and are only schematic diagrams, not actual drawings. They should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0020] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", "front", "back", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the figures. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationships in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] like Figure 1 As shown, the present invention provides a foot switch signal protection circuit for protecting signal transmission between a foot switch 1 and a processor 2. The protection circuit includes an overvoltage protection circuit, an optoelectronic isolation circuit, a common-mode interference suppression circuit, and an electrostatic protection circuit. The common-mode interference suppression circuit is connected between the overvoltage protection circuit and the optoelectronic isolation circuit, and the electrostatic protection circuit is connected between the common-mode interference suppression circuit and the optoelectronic isolation circuit. The signal from the foot switch 1 is input into the voltage protection circuit and then transmitted to the processor 2 after passing through the common-mode interference suppression circuit, the electrostatic protection circuit, and the optoelectronic isolation circuit. In this embodiment, the processor 2 is a single-chip microcomputer.

[0022] In this embodiment, the overvoltage protection circuit is used to reduce the impact of overvoltage on electronic equipment. Specifically, the overvoltage protection circuit includes a gas discharge tube 3, one end of which is connected to the circuit of the foot switch 1, and the other end is connected to the circuit of one end of the photoelectric isolation circuit. The gas discharge tube 3 is used for overvoltage protection of the foot switch 1. The gas discharge tube 3 can be connected in parallel in the circuit. When an overvoltage occurs, they will quickly turn on and guide the surge current to the ground, thereby protecting subsequent electronic equipment from overvoltage damage. Once the overvoltage disappears, the gas discharge tube 3 will return to a high-resistance insulation state, waiting for the next impact, preventing the impact of overvoltage such as lightning strikes on the signal of the foot switch 1. In some other embodiments, the overvoltage protection circuit can also select a voltage limiter, a Zener diode, etc.

[0023] In this embodiment, the common-mode interference suppression circuit is used to filter and suppress common-mode electromagnetic interference signals. Specifically, the common-mode interference suppression circuit includes a common-mode inductor filter 4, one end of the common-mode inductor filter 4 is connected to one end of the overvoltage protection circuit, and the other end is connected to one end of the optoelectronic isolation circuit. By filtering and suppressing the common-mode electromagnetic interference signal through the common-mode inductor filter 4, the signal quality and system reliability are improved. In addition, the common-mode inductor filter 4 reduces the propagation of common-mode noise by limiting the flow of common-mode current, thereby reducing ground loop interference. In some other embodiments, the common-mode interference suppression circuit can also suppress common-mode interference by providing a shielded cable and a shielding box, or reasonably layout the ground network to ensure that the ground impedance is low and evenly distributed. By reducing ground noise, the impact of common-mode interference on the circuit is reduced.

[0024] In this embodiment, an electrostatic protection circuit is used to reduce the impact of electrostatic fields on signal circuits. Specifically, the electrostatic protection circuit includes an ESD electrostatic protector 5, one end of which is connected to one end of the common-mode interference suppression circuit, and the other end is connected to one end of the optoelectronic isolation circuit. By providing an electrostatic protection circuit, the foot switch 1 circuit can be prevented from being damaged by the electrostatic field. In other embodiments, the electrostatic protection function can also be achieved by providing an electrostatic eliminator.

[0025] In this embodiment, a photoelectric isolation circuit is used to protect electronic equipment from electrical shock and damage. Specifically, the photoelectric isolation circuit includes an optical coupler 6, one end of which is connected to one end of the overvoltage protection circuit, and the other end is connected to the processor 2 circuit. Photoelectric isolation uses the optical coupler 6 to isolate the input and output from each other, and has good electrical insulation and anti-interference capabilities. And because the input end of the optical coupler 6 is a low-resistance element working in the current mode, it has a strong common-mode suppression capability. In long-distance transmission, it can be used as a terminal isolation element to effectively improve the signal-to-noise ratio. In some other embodiments, relays, transformers, etc. can also be selected to achieve isolation.

[0026] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and such modifications or equivalent substitutions shall be encompassed by the claims of the present invention. The techniques, shapes, and structural portions not described in detail in the present invention are well known.

Claims

1. A foot switch signal protection circuit for protecting signal transmission between a foot switch and a processor, characterized by: The protection circuit includes an overvoltage protection circuit and a photoelectric isolation circuit. The foot switch signal is input into the voltage protection circuit and transmitted to the processor after passing through the photoelectric isolation circuit.

2. A foot switch signal protection circuit according to claim 1, characterized in that: The overvoltage protection circuit includes a gas discharge tube, one end of which is connected to the foot switch circuit, and the other end of which is connected to one end of the photoelectric isolation circuit.

3. A foot switch signal protection circuit according to claim 1 or 2, characterized in that: The photoelectric isolation circuit includes an optical coupler, one end of the optical coupler is connected to one end of the overvoltage protection circuit, and the other end is connected to the processor circuit.

4. The foot switch signal protection circuit according to claim 3, characterized in that: A common-mode interference suppression circuit is connected between the overvoltage protection circuit and the photoelectric isolation circuit.

5. The foot switch signal protection circuit according to claim 4, characterized in that: The common-mode interference suppression circuit includes a common-mode inductor filter, one end of which is connected to one end of the overvoltage protection circuit, and the other end of which is connected to one end of the photoelectric isolation circuit.

6. The foot switch signal protection circuit according to claim 4, characterized in that: An electrostatic protection circuit is provided between the common-mode interference suppression circuit and the photoelectric isolation circuit.

7. The foot switch signal protection circuit according to claim 6, characterized in that: The electrostatic protection circuit includes an ESD electrostatic protector, one end of the ESD electrostatic protector is connected to one end of the common mode interference suppression circuit, and the other end of the ESD electrostatic protector is connected to one end of the photoelectric isolation circuit.

Images