CN116549281A - Electronic acupuncture system and detection method - Google Patents

Abstract

The invention relates to an electronic acupuncture system and a detection method, wherein the electronic acupuncture system comprises a host and a conductive needle, the host comprises a singlechip main control module, a power supply module, a man-machine interface module, a pulse driving module and an open-circuit self-checking module, the power supply module is connected with the singlechip main control module, the pulse driving module and the man-machine interface module, the singlechip main control module is connected with the man-machine interface module, and the singlechip main control module is connected with the pulse driving module and controls the pulse driving module to transmit therapeutic pulse current to the conductive needle; the open-circuit self-checking module is respectively connected with the pulse driving module and the singlechip main control module and is used for continuously detecting and outputting a load state and transmitting an error state to the singlechip main control module when an open circuit occurs, and the singlechip main control module controls the pulse driving module to close output current and sends an error prompt to the man-machine interface module which sends a prompt.

Description

Electronic acupuncture system and detection method

Technical Field

The invention relates to the technical field of electronic acupuncture systems, in particular to an electronic acupuncture system with output short circuit detection and a detection method.

Background

Acupuncture is an important component of Chinese traditional medicine. In traditional Chinese medicine, the channels and collaterals are better than the connecting net, so that viscera and body surfaces of a human body are combined into a whole body, and the functions of the whole system are adjusted. By stimulating the acupuncture points of the system through acupuncture, the effects of dredging channels and activating blood, harmonizing yin and yang and eliminating evil can be achieved. However, this requires a high level of expertise and skill, which is difficult for the average person to grasp.

The electronic acupuncture is to stimulate the acupoints by using the electric pulse mode with specific waveform, and replace the mechanical stimulation by using the electric current mode to achieve the aim of acupuncture. The requirements on the skill of needle application are greatly reduced, and general staff can apply the needle for symptoms by means of the meridian point map, so that the needle is convenient for more users to use. When in use, multiple paths are usually needed to act on a human body at the same time, and the output loop is easy to open because the tail end of the wire is connected with the needle body through a clip or the wire is aged for a long time and has poor contact. The user may misunderstand that the strength of the machine is weakened or the output is stopped, and then manually increase the strength, if the open circuit is released at this time, a higher-strength current will act on the human body, so that the user is subjected to sudden strong stimulus, and the user experience is seriously affected and even the life safety of the user is threatened.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an electronic acupuncture system with output short circuit detection and a detection method, which are used for detecting an output external electric loop in real time, and immediately closing an output stop electric pulse once an output part is opened.

In order to achieve the above purpose, the present invention provides the following technical solutions: the electronic acupuncture system comprises a host, a conductive needle and an open circuit detection device, wherein the host comprises a single-chip microcomputer main control module, a power supply module, a man-machine interface module, a pulse driving module and an open circuit self-checking module, the power supply module is connected with the single-chip microcomputer main control module, the pulse driving module and the man-machine interface module, the single-chip microcomputer main control module is connected with the man-machine interface module, and the single-chip microcomputer main control module is connected with the pulse driving module and controls the pulse driving module to convey therapeutic pulse current to the conductive needle; the open circuit self-checking module is respectively connected with the pulse driving module and the singlechip main control module and is used for continuously detecting the output load state and transmitting an error state to the singlechip main control module when an open circuit occurs, the singlechip main control module controls the pulse driving module to close the output current and transmits an error prompt to the man-machine interface module, and the man-machine interface module sends a prompt;

the open circuit detection device comprises an inductor, a first triode, a second triode, a third triode, an LED lamp and a driving power supply, wherein one end of the inductor is provided with a connecting probe, the other end of the inductor is connected with a base electrode of the first triode, a collector electrode of the second triode and a positive end of the LED lamp are all connected with a positive end of the driving power supply, a collector electrode of the third triode is connected with a negative end of the LED lamp, an emitter electrode of the first triode is connected with a base electrode of the second triode, an emitter electrode of the second triode is connected with a base electrode of the third triode, and an emitter electrode of the third triode is connected with a negative end of the driving power supply;

and a plurality of detection ports are arranged on each circuit module in the host, and the connection probes can be in one-to-one pairing contact with all the detection ports.

In some embodiments, the host includes a voltage dividing differential network, the voltage dividing differential network includes a resistor R11, a resistor R12, a resistor R9, a resistor R10, and a capacitor C1, the current limiting drive circuit includes an operational amplifier U2A, a resistor R1, a triode Q1, and a resistor R8, the voltage controlling circuit includes a transformer T1 and a resistor R3, and the pulse signal attenuates the rectangular wave and becomes a sawtooth wave after passing through the voltage dividing differential network; the converted signal enters the current-limiting driving circuit from the + end of the U2A and then enters the voltage control circuit, the primary current of the transformer T1 and the voltage of the operational amplifier U2A are in linear relation so as to control the accurate output intensity, and the resistor R3 is used for limiting the open-circuit voltage.

In some embodiments, the open circuit self-checking module comprises a resistor R7, a resistor R13, a transformer T2, a resistor R14, a capacitor C3, a common base amplifier and a capacitor C4, wherein the common base amplifier comprises a triode Q2/a resistor R15/R5, the resistor R7 acts on a primary coil of the transformer T2, the resistor R13 is used for shunting primary current of the transformer T2, magnetic coupling of the transformer T2 is performed, a secondary coil of the transformer T2 induces current and obtains required voltage on the resistor R14, the current is amplified by the capacitor C3 ac coupling of the common base amplifier, and the amplified current is sent to the singlechip master control module by the capacitor C4; when the output lead is open, the current of the secondary winding of the transformer T1 is released only through the resistor R3, no current passes through the primary coil of the transformer T2, so that no induced current passes through the secondary coil of the transformer T2, the singlechip main control module judges that the open circuit of the output end occurs, and the singlechip main control module closes the output.

In some embodiments, the first transistor, the second transistor and the third transistor are NPN transistors.

In some of these embodiments, the LED lamp is a red LED lamp.

In some embodiments, a capacitor is connected in parallel with the driving power supply.

In some embodiments, the capacitor is an electrolytic capacitor, the positive terminal of the capacitor is connected to the positive terminal of the driving power supply, and the negative terminal of the capacitor is connected to the negative terminal of the driving power supply.

In some embodiments, a buzzer is connected in parallel to the LED lamp.

In order to achieve the above purpose, the present invention further provides the following technical solutions: a detection method of an electronic acupuncture system, comprising the following steps:

connecting a singlechip main control module, a power supply module, a man-machine interface module, a pulse driving module and an open-circuit self-checking module, wherein the power supply module is connected with the singlechip main control module, the pulse driving module and the man-machine interface module, the singlechip main control module is connected with the man-machine interface module, and the singlechip main control module is connected with the pulse driving module and controls the pulse driving module to convey therapeutic pulse current to the conductive needle;

when an open circuit occurs, the open circuit self-checking module transmits an error state to the singlechip main control module, the singlechip main control module controls the pulse driving module to close the output current and transmits an error prompt to the man-machine interface module, and the man-machine interface module sends out a prompt;

the pulse signal is attenuated and changed into a sawtooth wave after passing through a partial pressure differential network; the converted signal enters a current-limiting driving circuit from the + end of U2A and then enters a voltage control circuit, the primary current of a transformer T1 and the voltage of an operational amplifier U2A are in linear relation so as to control accurate output intensity, and a resistor R3 is used for limiting open-circuit voltage;

the resistor R7 acts on the primary coil of the transformer T2, the resistor R13 is used for shunting the primary current of the transformer T2, the secondary coil of the transformer T2 induces the current and obtains the required voltage on the resistor R14 through the magnetic coupling of the transformer T2, the current is amplified through the capacitor C3 AC coupling common base amplifier, and the current is sent to the singlechip main control module through the capacitor C4; when the output lead is open, the current of the secondary winding of the transformer T1 is released only through the resistor R3, the primary coil of the transformer T2 does not pass through the current, so that the secondary coil of the transformer T2 does not have induced current, the singlechip main control module judges that the open circuit of the output end occurs, and the singlechip main control module closes the output;

after the circuit appears the open circuit condition, through the connection probe of open circuit detection device, contact detection is carried out to every detection port, through the circular telegram wire of connection probe and the left and right sides of inductance, make the inductor respond to the weak electric current of department at connection probe department, then the switch-on of triode, the three triode constitutes tertiary direct coupling formula small signal amplifier, switch on triode three, make driving power supply light the LED lamp, this department is the electric end promptly, then detect for next department detection port, LED lamp does not give out light after detecting until a certain detection port department detects, this department is open circuit outage department promptly, can maintain the maintenance to this department.

Compared with the prior art, the invention has the beneficial effects that: the open-circuit self-checking module detects the output external electric loop in real time, immediately closes the output stop electric pulse once the output part is open, and prompts the user that the fault occurs by obvious sound or light, thereby avoiding the user from experiencing bad experience and protecting the safety of the user; meanwhile, the open circuit detection device can detect the open circuit break point of the equipment, so that the equipment is convenient to open circuit maintenance, the maintenance cost is reduced, and the use efficiency is improved.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application, and to provide a thorough description and understanding of the embodiments of the application.

Drawings

FIG. 1 is a schematic diagram of the whole machine of the present invention;

FIG. 2 is a schematic diagram of a single chip microcomputer according to the present invention;

fig. 3 is a circuit diagram of an electronic acupuncture system according to the present invention;

fig. 4 is a circuit diagram of the open circuit detection device of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1, the electronic acupuncture system provided by the embodiment of the invention comprises a host and a conductive needle, wherein the host comprises a singlechip main control module, a power supply module, a man-machine interface module, a pulse driving module and an open-circuit self-checking module, the power supply module is connected with the singlechip main control module, the pulse driving module and the man-machine interface module, the singlechip main control module is connected with the man-machine interface module, and the singlechip main control module is connected with the pulse driving module and controls the pulse driving module to convey therapeutic pulse current to the conductive needle; the open-circuit self-checking module is respectively connected with the pulse driving module and the singlechip main control module and is used for continuously detecting and outputting a load state and transmitting an error state to the singlechip main control module when an open circuit occurs, and the singlechip main control module controls the pulse driving module to close output current and sends an error prompt to the man-machine interface module which sends a prompt.

The open-circuit self-checking module detects the output external electric loop in real time, immediately closes the output stop electric pulse once the output part is open, and prompts the user to have faults by obvious sound or light, thereby avoiding the user from experiencing bad experience and protecting the safety of the user.

As shown in fig. 2, the single-chip microcomputer U1 is an MS51FB9A, and a 16-pin LED is used for connecting with a parameter status display in the man-machine interface module, displaying a working status, a power status, etc.; the 17-pin BEEP control connection is connected with parameter status buzzing in the man-machine interface module to prompt various operation status and alarm status; the 18-pin FBO is connected with the open-circuit self-checking module, the state of the output port is continuously detected, and the singlechip U1 can immediately protect and prompt a user when an open circuit occurs; 19/20/1/2/3/14 pins K1-K6 are used for connecting parameter input and adjustment in the man-machine interface module, detecting input setting of each channel, and timely opening/closing/adjusting the corresponding channel; the 5-foot WF is used for connecting parameter input and adjustment in the man-machine interface module and detecting waveform input; 15/14/13/12/11/10/8 pins PULSE1-6 are used to connect the PULSE driver module circuitry to generate the electrical PULSEs for each channel.

As shown in fig. 3, the host includes a voltage dividing differential network, a current limiting driving circuit and a voltage control circuit, the voltage dividing differential network includes a resistor R11, a resistor R12, a resistor R9, a resistor R10 and a capacitor C1, the current limiting driving circuit includes an operational amplifier U2A, a resistor R1, a triode Q1 and a resistor R8, the voltage control circuit includes a transformer T1 and a resistor R3, and after passing through the voltage dividing differential network, the pulse signal attenuates the rectangular wave and becomes a sawtooth wave; the converted signal enters the current-limiting driving circuit from the + end of the U2A and then enters the voltage control circuit, the primary current of the transformer T1 and the voltage of the operational amplifier U2A are in linear relation so as to control the accurate output intensity, and the resistor R3 is used for limiting the open-circuit voltage.

The open-circuit self-checking module comprises a resistor R7, a resistor R13, a transformer T2, a resistor R14, a capacitor C3, a common base amplifier and a capacitor C4, wherein the common base amplifier comprises a triode Q2/a resistor R15/R5, the resistor R7 acts on a primary coil of the transformer T2, the resistor R13 is used for shunting primary current of the transformer T2, the current is induced by a secondary coil of the transformer T2 and required voltage is obtained on the resistor R14, the common base amplifier is amplified through the capacitor C3 and the current is sent to the singlechip master control module through the capacitor C4; when the output lead is open, the current of the secondary winding of the transformer T1 is released only through the resistor R3, no current passes through the primary coil of the transformer T2, so that no induced current passes through the secondary coil of the transformer T2, the singlechip main control module judges that the open circuit of the output end occurs, and the singlechip main control module closes the output.

Specifically, the working process is as follows: the PULSE signal enters from the PULSE position, and the rectangular wave is attenuated and changed into a sawtooth wave through a voltage dividing differential network consisting of resistors R11/R12/R9/R10 and C1; the converted signal enters a current-limiting driving circuit formed by an operational amplifier U2A/a resistor R1/a triode Q1/a resistor R8 from the + end of U2A, and the current on R8 is in a linear relation with the voltage entering the U2A + end, and as the current of a primary winding of a transformer T1 is approximately equal to the currents of Q1-Ice and R8, the linear relation between the primary current of T1 and the voltage of U2A+ can be considered, and the accurate output intensity can be controlled by inputting the linear relation; the resistor R3 is used to limit the open circuit voltage due to the primary current of the transformer T1, the secondary winding of T1 inducing a corresponding voltage. The voltage is output from the J1 port to a connecting wire and a conductive needle through a resistor R6 and acts on human skin, then acts on a primary coil of a transformer T2 through a resistor R7 (a resistor R13 is used for shunting primary current of the T2), current is induced by a secondary coil of the T2 through magnetic coupling of the transformer T2, required voltage is obtained on a resistor R14, and the current is amplified through a capacitor C3 AC coupling to a common base amplifier consisting of a triode Q2/a resistor R15/R5 and sent to an 18-pin FBO of a singlechip U1 through a capacitor C4. The FBO is fixed to 3.3v by the internal pull-up resistor of U1, and U1 generates a low level with the 18-pin FBO signal to determine that no open circuit at the output port occurs; if J1 is well connected with a human body through a connecting wire and a conductive needle and is being treated, the burst output wire is open, the current of the secondary winding of T1 is only released through R3, the primary winding of the transformer T2 does not pass through, the secondary winding of T2 does not induce current, and the FBO signal is continuously at a high level; the singlechip U1 finds that the 18-pin FBO has no feedback signal, judges that the open circuit of the output end occurs, then the U1 stops the pulse output of PLUSE, namely, the output is closed, and the corresponding buzzing alarm circuit is driven by the 17-pin BEEP to remind a user of the occurrence of faults.

As shown in fig. 4, the open circuit detection device includes an inductor 2, a first triode 3, a second triode 4, a third triode 5, an LED lamp 6 and a driving power supply 7, wherein one end of the inductor is provided with a connecting probe 1, the other end of the inductor is connected with a base electrode of the first triode, a collector electrode of the second triode and a positive electrode of the LED lamp are all connected with a positive electrode of the driving power supply, a collector electrode of the third triode is connected with a negative electrode of the LED lamp, an emitter electrode of the first triode is connected with a base electrode of the second triode, an emitter electrode of the second triode is connected with a base electrode of the third triode, and an emitter electrode of the third triode is connected with a negative electrode of the driving power supply; a plurality of detection ports are arranged on each circuit module in the host, and the connection probes can be in one-to-one pairing contact with all the detection ports; the LED lamp is a red LED lamp, a capacitor 8 is connected in parallel on the driving power supply, the capacitor is an electrolytic capacitor, the positive electrode end of the capacitor is connected with the positive electrode end of the driving power supply, the negative electrode end of the capacitor is connected with the negative electrode end of the driving power supply, and a buzzer 9 is connected in parallel on the LED lamp.

After the circuit appears the open circuit condition, through the connection probe of open circuit detection device, contact detection is carried out to every detection port, through the circular telegram wire of connection probe and the left and right sides of inductance, make the inductor respond to the weak electric current of department at connection probe department, then the switch-on of triode, the three triode constitutes tertiary direct coupling formula small signal amplifier, switch on triode three, make driving power supply light the LED lamp, this department is the electric end promptly, then detect for next department detection port, LED lamp does not give out light after detecting until a certain detection port department detects, this department is open circuit outage department promptly, can maintain the maintenance to this department.

When the broken line breakpoint detection is used, the induction sensitivity can be adjusted by adjusting the winding mode of the coil and increasing or decreasing the amplifying stage number of the triode.

If the voice prompt is to be added, an active buzzer is connected in parallel with the two ends of the LED lamp, so that the voice prompt is realized through the buzzer.

Through the technical scheme of the application, the invention also comprises a detection method of the electronic acupuncture system, which comprises the following steps: connecting a singlechip main control module, a power supply module, a man-machine interface module, a pulse driving module and an open-circuit self-checking module, wherein the power supply module is connected with the singlechip main control module, the pulse driving module and the man-machine interface module, the singlechip main control module is connected with the man-machine interface module, and the singlechip main control module is connected with the pulse driving module and controls the pulse driving module to convey therapeutic pulse current to the conductive needle;

when an open circuit occurs, the open circuit self-checking module transmits an error state to the singlechip main control module, the singlechip main control module controls the pulse driving module to close the output current and transmits an error prompt to the man-machine interface module, and the man-machine interface module sends out a prompt;

the pulse signal is attenuated and changed into a sawtooth wave after passing through a partial pressure differential network; the converted signal enters a current-limiting driving circuit from the + end of U2A and then enters a voltage control circuit, the primary current of a transformer T1 and the voltage of an operational amplifier U2A are in linear relation so as to control accurate output intensity, and a resistor R3 is used for limiting open-circuit voltage;

the resistor R7 acts on the primary coil of the transformer T2, the resistor R13 is used for shunting the primary current of the transformer T2, the secondary coil of the transformer T2 induces the current and obtains the required voltage on the resistor R14 through the magnetic coupling of the transformer T2, the current is amplified through the capacitor C3 AC coupling common base amplifier, and the current is sent to the singlechip main control module through the capacitor C4; when the output lead is open, the current of the secondary winding of the transformer T1 is released only through the resistor R3, the primary coil of the transformer T2 does not pass through the current, so that the secondary coil of the transformer T2 does not have induced current, the singlechip main control module judges that the open circuit of the output end occurs, and the singlechip main control module closes the output;

after the circuit appears the open circuit condition, through the connection probe of open circuit detection device, contact detection is carried out to every detection port, through the circular telegram wire of connection probe and the left and right sides of inductance, make the inductor respond to the weak electric current of department at connection probe department, then the switch-on of triode, the three triode constitutes tertiary direct coupling formula small signal amplifier, switch on triode three, make driving power supply light the LED lamp, this department is the electric end promptly, then detect for next department detection port, LED lamp does not give out light after detecting until a certain detection port department detects, this department is open circuit outage department promptly, can maintain the maintenance to this department.

The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The electronic acupuncture system is characterized by comprising a host, a conductive needle and an open circuit detection device, wherein the host comprises a singlechip main control module, a power supply module, a man-machine interface module, a pulse driving module and an open circuit self-checking module, the power supply module is connected with the singlechip main control module, the pulse driving module and the man-machine interface module, the singlechip main control module is connected with the man-machine interface module, and the singlechip main control module is connected with the pulse driving module and controls the pulse driving module to convey therapeutic pulse current to the conductive needle; the open-circuit self-checking module is respectively connected with the pulse driving module and the singlechip main control module and is used for continuously detecting and outputting a load state and transmitting an error state to the singlechip main control module when an open circuit occurs, and the singlechip main control module controls the pulse driving module to close output current and sends an error prompt to the man-machine interface module which sends a prompt.

2. The system of claim 1, wherein the host comprises a voltage dividing and differentiating network, a current limiting driving circuit and a voltage control circuit, the voltage dividing and differentiating network comprises a resistor R11, a resistor R12, a resistor R9, a resistor R10 and a capacitor C1, the current limiting and driving circuit comprises an operational amplifier U2A, a resistor R1, a triode Q1 and a resistor R8, the voltage control circuit comprises a transformer T1 and a resistor R3, a pulse signal attenuates a rectangular wave and becomes a sawtooth wave after passing through the voltage dividing and differentiating network, the converted signal enters the current limiting and driving circuit from the +end of U2A and then enters the voltage control circuit, primary current of the transformer T1 and voltage of the operational amplifier U2A are in linear relation to control accurate output intensity, and the resistor R3 is used for limiting open-circuit voltage.

3. The electronic acupuncture system according to claim 2, wherein the open circuit self-checking module comprises a resistor R7, a resistor R13, a transformer T2, a resistor R14, a capacitor C3, a common base amplifier and a capacitor C4, the common base amplifier comprises a triode Q2/a resistor R15/R5, the resistor R7 acts on a primary coil of the transformer T2, the resistor R13 is used for shunting the primary current of the transformer T2, the magnetic coupling of the transformer T2 is performed, the secondary coil of the T2 induces the current and obtains the required voltage on the resistor R14, the current is amplified by the capacitor C3 ac coupling common base amplifier, and the amplified current is sent to the singlechip master control module by the capacitor C4; when the output lead is open, the current of the secondary winding of the transformer T1 is released only through the resistor R3, no current passes through the primary coil of the transformer T2, so that no induced current passes through the secondary coil of the transformer T2, the singlechip main control module judges that the open circuit of the output end occurs, and the singlechip main control module closes the output.

4. The electronic acupuncture system according to claim 1, wherein the open circuit detection device comprises an inductor, a first triode, a second triode, a third triode, an LED lamp and a driving power supply, wherein one end of the inductor is provided with a connecting probe, the other end of the inductor is connected with a base electrode of the first triode, a collector electrode of the second triode and a positive electrode of the LED lamp are all connected with a positive electrode end of the driving power supply, a collector electrode of the third triode is connected with a negative electrode end of the LED lamp, an emitter electrode of the first triode is connected with a base electrode of the second triode, an emitter electrode of the second triode is connected with a base electrode of the third triode, and an emitter electrode of the third triode is connected with a negative electrode end of the driving power supply;

a plurality of detection ports are arranged on each circuit module in the host, and the connection probes can be in one-to-one pairing contact with all the detection ports;

the first triode, the second triode and the third triode are NPN type triodes.

5. The electronic acupuncture system of claim 4, wherein the LED lamp is a red LED lamp.

6. The system of claim 4, wherein the driving power source is connected in parallel with a capacitor.

7. The system of claim 6, wherein the capacitor is an electrolytic capacitor, the positive terminal of the capacitor is connected to the positive terminal of the driving power source, and the negative terminal of the capacitor is connected to the negative terminal of the driving power source.

8. The system according to claim 7, wherein a buzzer is connected in parallel to the LED lamp.

9. The detection method of the electronic acupuncture system is characterized by comprising the following steps of:

the method comprises the steps of connecting a single-chip microcomputer main control module, a power supply module, a man-machine interface module, a pulse driving module and an open-circuit self-checking module, wherein the power supply module is connected with the single-chip microcomputer main control module, the pulse driving module and the man-machine interface module, the single-chip microcomputer main control module is connected with the pulse driving module, and the pulse driving module is controlled to convey therapeutic pulse current to a conductive needle;

when an open circuit occurs, the open circuit self-checking module transmits an error state to the singlechip main control module, the singlechip main control module controls the pulse driving module to close the output current and transmits an error prompt to the man-machine interface module, and the man-machine interface module sends out a prompt;

the pulse signal is attenuated and changed into sawtooth wave after passing through a voltage dividing differential network, the converted signal enters a current limiting driving circuit from the + end of U2A and then enters a voltage control circuit, the primary current of a transformer T1 and the voltage of an operational amplifier U2A are in linear relation so as to control accurate output intensity, and a resistor R3 is used for limiting open-circuit voltage;

the resistor R7 acts on the primary coil of the transformer T2, the resistor R13 is used for shunting the primary current of the transformer T2, the secondary coil of the transformer T2 induces the current and obtains the required voltage on the resistor R14 through the magnetic coupling of the transformer T2, the current is amplified through the capacitor C3 AC coupling common base amplifier, and the current is sent to the singlechip main control module through the capacitor C4; when the output lead is open, the current of the secondary winding of the transformer T1 is released only through the resistor R3, the primary coil of the transformer T2 does not pass through the current, so that the secondary coil of the transformer T2 does not have induced current, the singlechip main control module judges that the open circuit of the output end occurs, and the singlechip main control module closes the output;

after the circuit appears the open circuit condition, through the connection probe of open circuit detection device, contact detection is carried out to every detection port, through the circular telegram wire of connection probe and the left and right sides of inductance, make the inductor respond to the weak electric current of department at connection probe department, then the switch-on of triode, the three triode constitutes tertiary direct coupling formula small signal amplifier, switch on triode three, make driving power supply light the LED lamp, this department is the electric end promptly, then detect for next department detection port, LED lamp does not give out light after detecting until a certain detection port department detects, this department is open circuit outage department promptly, can maintain the maintenance to this department.