CN212781162U - High frequency operation equipment leakage current detection circuitry - Google Patents
High frequency operation equipment leakage current detection circuitry Download PDFInfo
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- CN212781162U CN212781162U CN202021364781.XU CN202021364781U CN212781162U CN 212781162 U CN212781162 U CN 212781162U CN 202021364781 U CN202021364781 U CN 202021364781U CN 212781162 U CN212781162 U CN 212781162U
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Abstract
The utility model discloses a high frequency operation equipment leakage current detection circuitry, including surplus high frequency current transformer, signal conditioning circuit, operational amplifier, comparator, controller and relay, surplus high frequency current transformer once side connection high frequency generator's output circuit, surplus high frequency current transformer's secondary side passes through signal conditioning circuit and connects operational amplifier's input, operational amplifier's output connect the input of comparator, the output connection director's of comparator input, the output of controller connect the coil of relay, the contact series connection of relay on high frequency generator's output circuit. The utility model discloses can detect the high frequency leakage current in the operation process to in time cut off the output when the high frequency leakage current exceeds standard, guarantee operation safety.
Description
Technical Field
The utility model relates to the technical field of medical equipment, especially, relate to a high frequency operation equipment leakage current detection circuitry.
Background
The high-frequency surgical equipment is common equipment in an operating room and comprises a high-frequency electrocautery instrument, the skin of a patient can be burnt due to the fact that high-frequency leakage current exceeds standard, in order to prevent unexpected thermal burn, the high-frequency leakage current is strictly required in the special safety requirements of GB9706.4 high-frequency surgical equipment, and a measuring method at an external port of the equipment is specified. The output frequency of the high-frequency operation equipment is high, generally more than 200kHz, mostly about 450 kHz, the individual maximum reaches 3MHz, the waveform contains higher harmonics, the output power of the high-frequency operation equipment is large, and is from dozens of watts to 400 watts, and the generated high-frequency leakage current is difficult to control.
At present, the high-frequency leakage current is not detected in high-frequency operation equipment, and if the high-frequency leakage current exceeds the standard in an actual operation, the output cannot be immediately cut off, so that unexpected thermal burn is prevented. The commonly used leakage protection device adopts a residual current transformer and an integrated circuit M54123, is only suitable for low-frequency 50Hz alternating current and cannot be applied to detection of high-frequency leakage current.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high frequency operation equipment leakage current detection circuitry can detect the high frequency leakage current in the operation process to in time cut off the output when the high frequency leakage current exceeds standard, guarantee operation safety.
In order to achieve the above object, the utility model adopts the following technical scheme:
a leakage current detection circuit of high-frequency surgical equipment comprises a residual high-frequency current transformer, a signal conditioning circuit, an operational amplifier, a comparator, a controller and a relay, wherein the primary side of the residual high-frequency current transformer is connected with an output loop of a high-frequency generator, the secondary side of the residual high-frequency current transformer is connected with the input end of the operational amplifier through the signal conditioning circuit, the output end of the operational amplifier is connected with the input end of the comparator, the output end of the comparator is connected with the input end of the controller, the output end of the controller is connected with a coil of the relay, and contacts of the relay are connected in series with the output loop of the high-frequency generator.
Furthermore, the detection circuit further comprises a D/A converter, and the output end of the controller is connected with the input end of the comparator through the D/A converter.
Furthermore, the signal conditioning circuit comprises a first resistor, a second resistor, a first diode, a second diode and a first capacitor, the secondary side of the residual high-frequency current transformer is connected with two ends of the first resistor, the first diode is connected in parallel with two ends of the first resistor, the second diode is connected in parallel with two ends of the first diode, the conducting directions of the first diode and the second diode are opposite, the second resistor and the first capacitor are connected in series and then connected in parallel with two ends of the second diode, and two ends of the first capacitor are respectively connected with the non-inverting input end and the inverting input end of the operational amplifier.
Further, the residual high-frequency current transformer is a ring transformer.
Furthermore, the controller is provided with an audible and visual alarm device.
Furthermore, the controller adopts a singlechip.
The utility model discloses increase the detection control of high frequency leakage current in high frequency operation equipment, adopt surplus high frequency current transformer to detect the surplus high frequency current in all output lines of high frequency operation equipment to loop through signal conditioning circuit and operational amplifier and send into the comparator, compare with the predetermined value, if there is high frequency leakage current to produce among the operation process, make controller control high frequency operation equipment cut off the output, prevent unexpected thermal burn, the security and the reliability of high frequency operation equipment have effectively been improved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
As shown in fig. 1, a high frequency surgical equipment leakage current detection circuit, including surplus high frequency current transformer L, signal conditioning circuit, operational amplifier U1, comparator U2, controller U4 and relay K, surplus high frequency current transformer L's the output circuit of once side connection high frequency generator, surplus high frequency current transformer L's secondary side passes through signal conditioning circuit and connects operational amplifier U1's input, operational amplifier U1's output connect comparator U2's input, comparator U2's output connect controller U4's input, controller U4's output connect relay K's coil, relay K's contact establish ties on high frequency generator's output circuit.
The residual high-frequency current transformer L is used for detecting residual high-frequency current in all output circuits of the high-frequency surgical equipment, the residual high-frequency current transformer L in the embodiment adopts a ring-shaped transformer with high magnetic permeability, all output circuits penetrate through the residual high-frequency current transformer L during installation, so that the vector sum of current in a primary circuit is detected, and when high-frequency leakage current is unbalanced to the ground, the vector sum of the current passing through the residual high-frequency current transformer L is not zero, and the residual high-frequency current transformer L collects residual high-frequency current signals.
The signal conditioning circuit comprises a first resistor R1, a second resistor R2, a first diode D1, a second diode D2 and a first capacitor C1, the secondary side of the residual high-frequency current transformer L is connected with two ends of the first resistor R1, the first diode D1 is connected with two ends of the first resistor R1 in parallel, the second diode D2 is connected with two ends of the first diode D1 in parallel, the conducting directions of the first diode D1 and the second diode D2 are opposite, the second resistor R2 and the first capacitor C1 are connected with each other in series and then connected with two ends of the second diode D2 in parallel, and two ends of the first capacitor C1 are respectively connected with a non-inverting input end and an inverting input end of an operational amplifier U1.
The residual high-frequency current signal is changed into a mV-level voltage signal through a first resistor R1, the mV-level voltage signal is sequentially subjected to amplitude limiting through a first diode D1 and a second diode D2, the second resistor R2 and a first capacitor C1 are used for filtering, a first operational amplifier U1 is used for amplifying and then sending the mV-level voltage signal into a comparator U2 to be compared with a preset value, if the mV-level voltage signal is larger than the preset value, the comparator U2 outputs a high-level signal and sends the high-level signal into a controller U4 to be identified, it is determined that high-frequency leakage current is generated, the controller U4 sends the high-level signal to drive a relay K to.
The detection circuit further comprises a D/A converter U3, and the output end of the controller U4 is connected with the input end of the comparator U2 through the D/A converter U3. The controller U4 can be used to switch the preset value of the comparator U2 according to different modes of the high-frequency operation equipment, and the digital quantity is converted into the analog quantity of 1-5V through the D/A converter U3.
In this embodiment, the controller U4 adopts a single chip microcomputer, and the controller U4 is provided with an audible and visual alarm device, which can perform audible and visual alarm while driving the relay K to be turned off.
The utility model discloses detect the high frequency leakage current in the actual operation, if the high frequency leakage current that has taken place exceeds standard, cut off the output immediately to the acousto-optic warning prevents unexpected thermal burn.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A high frequency surgical equipment leakage current detection circuit characterized in that: the high-frequency current transformer comprises a residual high-frequency current transformer, a signal conditioning circuit, an operational amplifier, a comparator, a controller and a relay, wherein the primary side of the residual high-frequency current transformer is connected with an output loop of a high-frequency generator, the secondary side of the residual high-frequency current transformer is connected with the input end of the operational amplifier through the signal conditioning circuit, the output end of the operational amplifier is connected with the input end of the comparator, the output end of the comparator is connected with the input end of the controller, the output end of the controller is connected with a coil of the relay, and contacts of the relay are connected in series with the output loop of the high-frequency generator.
2. A leakage current detection circuit for a high frequency surgical device according to claim 1, wherein: the detection circuit also comprises a D/A converter, and the output end of the controller is connected with the input end of the comparator through the D/A converter.
3. A leakage current detection circuit for a high frequency surgical device according to claim 1, wherein: the signal conditioning circuit comprises a first resistor, a second resistor, a first diode, a second diode and a first capacitor, wherein the secondary side of the residual high-frequency current transformer is connected with two ends of the first resistor, the first diode is connected in parallel with two ends of the first resistor, the second diode is connected in parallel with two ends of the first diode, the conducting directions of the first diode and the second diode are opposite, the second resistor and the first capacitor are connected in series and then connected in parallel with two ends of the second diode, and two ends of the first capacitor are respectively connected with the non-inverting input end and the inverting input end of the operational amplifier.
4. A leakage current detection circuit for a high frequency surgical device according to claim 1, wherein: and the rest high-frequency current transformers are ring transformers.
5. A leakage current detection circuit for a high frequency surgical device according to claim 1, wherein: the controller is provided with an audible and visual alarm device.
6. A leakage current detection circuit for a high frequency surgical device according to claim 1, wherein: the controller adopts a singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021364781.XU CN212781162U (en) | 2020-07-13 | 2020-07-13 | High frequency operation equipment leakage current detection circuitry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021364781.XU CN212781162U (en) | 2020-07-13 | 2020-07-13 | High frequency operation equipment leakage current detection circuitry |
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| CN202021364781.XU Active CN212781162U (en) | 2020-07-13 | 2020-07-13 | High frequency operation equipment leakage current detection circuitry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325028A (en) * | 2021-12-28 | 2022-04-12 | 北京博电新力电气股份有限公司 | Sampling circuit module |
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2020
- 2020-07-13 CN CN202021364781.XU patent/CN212781162U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325028A (en) * | 2021-12-28 | 2022-04-12 | 北京博电新力电气股份有限公司 | Sampling circuit module |
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