CN115454192B - Two-bus circuit - Google Patents

Two-bus circuit Download PDF

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CN115454192B
CN115454192B CN202211235313.6A CN202211235313A CN115454192B CN 115454192 B CN115454192 B CN 115454192B CN 202211235313 A CN202211235313 A CN 202211235313A CN 115454192 B CN115454192 B CN 115454192B
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triode
electrode
resistor
module
collector
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CN115454192A (en
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请求不公布姓名
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Yingzhi Technology Changzhou Co ltd
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Yingzhi Technology Changzhou Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/561—Voltage to current converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
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  • Automation & Control Theory (AREA)
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Abstract

The invention discloses a two-bus circuit which comprises an output module, a discharge module, a code return detection module, a short-circuit protection module and an overcurrent protection module, wherein the input end of the output module is connected with a power supply, the output end of the output module is two buses, the two buses comprise a first bus and a second bus, the output module is connected with the discharge module, the code return detection module is connected with the two buses in parallel, the short-circuit protection module is connected with the output module, and the overcurrent protection module is connected with the output module. The two-bus circuit uses the N-type MOSFET, and can meet the requirements of various bus voltages and power grades; the N-type MOSFET is designed to the negative end of the two buses, so that the driving is convenient.

Description

Two-bus circuit
Technical Field
The present invention relates to the field of bus technology, and in particular, to a two-bus circuit.
Background
The two-bus technology combines the power line and the signal line into a whole, can meet the power supply requirement and the communication requirement, saves the construction and cable cost, brings great convenience to site construction and later maintenance, and has wide application in the fields of fire protection, instruments, sensors, industrial control and the like. P-type MOSFETs are commonly used in the two-bus technology, however, the P-type MOSFETs have few types, high price and incomplete parameters, which are selectable in the market, and make the application of the two-bus technology difficult.
Disclosure of Invention
In order to solve the above problems, the present invention provides a two-bus circuit using an N-type MOSFET, which can cope with the requirements of various bus voltages and power levels.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the utility model provides a two bus circuit, includes output module, the module of discharging, returns the code detection module, output module's input connection power, output module's output is two buses, two buses include first bus and second bus, output module connects the module of discharging, return the code detection module with two buses are parallelly connected.
The output module comprises a plurality of switching tubes, a plurality of triodes, a first voltage stabilizing diode and a first resistor, wherein the first bus is connected with a first power supply, a first input end is connected with a grid electrode of the first switching tube, a source electrode of the first switching tube is grounded, a drain electrode of the first switching tube is connected with a base electrode of the first triode, the base electrode of the first triode is connected with the first bus, an emitter electrode of the first triode is grounded, a collector electrode of the first triode is connected with the first bus, a collector electrode of the first triode is connected with a base electrode of a second triode and a base electrode of a third triode, a collector electrode of the second triode is grounded, an emitter electrode of the third triode is connected with a base electrode of a fourth triode, a collector electrode of the fourth triode is connected with the second triode, a collector electrode of the second triode is connected with a drain electrode of the second diode, and the second resistor is grounded.
The output module further comprises a fifth triode, a first capacitor, a third switch tube and a plurality of diodes, wherein the anode of the first diode is connected with the cathode of the first voltage-stabilizing diode, the cathode of the first diode is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the drain electrode of the second switch tube, the source electrode of the third switch tube is connected with the second bus, the cathode of the second diode is connected with the grid electrode of the third switch tube, the anode of the second diode is connected with the source electrode of the third switch tube, the drain electrode of the third switch tube is connected with the cathode of the third diode, the anode of the third diode is connected with the first output end, the first input end is connected with the base electrode of the fifth triode, the emitter electrode of the fifth triode is grounded, and the collector electrode of the fifth triode is connected with the grid electrode of the third switch tube and the first end of the first capacitor.
The discharging module comprises a plurality of triodes, the second input end is connected with the base electrode of the sixth triode, the emitting electrode of the sixth triode is grounded, the collecting electrode of the sixth triode is connected with the collecting electrode of the seventh triode, the emitting electrode of the seventh triode is connected with the first power supply, the emitting electrode of the eighth triode is connected with the base electrode of the seventh triode, the base electrode of the eighth triode is connected with the emitting electrode of the ninth triode, the base electrode of the ninth triode is connected with the collecting electrode of the seventh triode, the collecting electrode of the eighth triode is connected with the collecting electrode of the ninth triode to be connected with the first output end, and the first output end is connected with the base electrode of the seventh triode.
In a specific embodiment, the two-bus circuit further includes a code return judging module, where the code return judging module includes a tenth triode, a second resistor, a third resistor, a fourth switching tube and a fourth diode, the third input end is connected to the base of the thirteenth diode, the emitter of the tenth triode is grounded, the collector of the tenth triode is connected to the gate of the fourth switching tube through the second resistor, the gate of the fourth switching tube is connected to the first bus through the third resistor, the second bus is connected to the anode of the fourth diode, the cathode of the fourth diode is connected to the source of the fourth switching tube, and the drain of the fourth switching tube is connected to the first middle end.
The code return detection module comprises a plurality of triodes, a plurality of resistors and a second zener diode, wherein the first middle end is connected with the emitter of the eleventh triode, the base electrode of the eleventh triode is connected with the emitter of the twelfth triode, the collector electrode of the twelfth triode is connected with the collector electrode of the eleventh triode, the base electrode of the twelfth triode is connected with the anode of the second zener diode, the cathode of the second zener diode is connected with the first power supply, the first end of the fourth resistor is connected with the base electrode of the twelfth triode, the second end of the fourth resistor is grounded, the collector electrode of the twelfth triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is grounded, and the first end of the fifth resistor is connected with the second output end.
The two-bus circuit further comprises a short-circuit protection module, and the short-circuit protection module is connected with the output module.
The short-circuit protection module comprises a plurality of triodes, a plurality of resistors, wherein a third output end is connected with a collector electrode of a thirteenth triode and a base electrode of a fourteenth triode, the collector electrode of the thirteenth triode is connected with a second power supply, an emitting electrode of the thirteenth triode is grounded, the base electrode of the thirteenth triode is connected with the collector electrode of the fourteenth triode, the emitting electrode of the fourteenth triode is connected with a grid electrode of the first switch tube, the collector electrode of the fourteenth triode is grounded, a first end of a sixth resistor is connected with the collector electrode of the fourteenth triode, a second end of the sixth resistor is grounded, a first end of a seventh resistor is connected with a second end of the seventh resistor, and a second end of the seventh resistor is connected with a source electrode of the second switch tube.
In a specific embodiment, the short-circuit protection module further includes a fifth diode, an anode of the fifth diode is connected to the third output end, and a cathode of the fifth diode is connected to the collector of the thirteenth triode.
The two-bus circuit further comprises an overcurrent protection module, and the overcurrent protection module is connected with the output module.
The over-current protection module comprises a first operational amplifier, wherein a source electrode of the second switching tube is connected with an input positive end of the first operational amplifier, an input negative end of the first operational amplifier is grounded, and an output end of the first operational amplifier is connected with a fourth output end.
In a specific embodiment, the code return detection module includes a plurality of triodes, a plurality of resistors, a third zener diode, a fourth input terminal is connected to a base electrode of a fifteenth triode, an emitter electrode of the fifteenth triode is grounded, a collector electrode of the fifteenth triode is connected to the base electrode of the sixteenth triode, an emitter electrode of the sixteenth triode is connected to a first power supply and a cathode electrode of the third zener diode, a collector electrode of the sixteenth triode is connected to an anode electrode of the third zener diode, a first output terminal is connected to an emitter electrode of the seventeenth triode, a base electrode of the seventeenth triode is connected to an anode electrode of the third zener diode, a collector electrode of the eighteenth triode is connected to a collector electrode of the seventeenth triode, a first end of an eighth resistor is connected to a base electrode of the eighteenth triode, a second end of the eighth resistor is grounded, a first end of the seventeenth resistor is connected to a first end of the ninth resistor, a second end of the ninth resistor is connected to a fourth end of the ninth resistor, and a ninth end of the ninth resistor is connected to a fifth end of the ninth resistor.
In a specific embodiment, the discharging module includes a nineteenth triode, a twentieth triode, a fourth zener diode, and a fifth switching tube, the fifth input end is connected to the base electrode of the nineteenth triode, the emitter electrode of the nineteenth triode is grounded, the collector electrode of the nineteenth triode is connected to the collector electrode of the twentieth triode, the emitter electrode of the twentieth triode is connected to the first power supply, the base electrode of the twentieth triode is connected to the source electrode of the fifth switching tube, the gate electrode of the fifth switching tube is connected to the collector electrode of the twentieth triode, the drain electrode of the fifth switching tube is connected to the first output end, the cathode electrode of the fourth zener diode is connected to the source electrode of the fifth switching tube, and the anode electrode of the fourth zener diode is connected to the gate electrode of the fifth switching tube.
In a specific embodiment, the discharging module includes a twenty-first triode and a sixth switching tube, the sixth input end is connected to the base electrode of the twenty-first triode, the emitter electrode of the twenty-first triode is grounded, the collector electrode of the twenty-first triode is connected to the gate electrode of the sixth switching tube, the source electrode of the sixth switching tube is connected to the first power supply, and the drain electrode of the sixth switching tube is connected to the first output end.
The first switching tube and the second switching tube are N-type MOSFETs.
The third switching tube is an N-type MOSFET.
The fourth switching tube is a P-type MOSFET.
The invention also provides a two-bus circuit, which comprises a plurality of the two-bus circuits.
The two-bus circuit has the beneficial effects that the N-type MOSFET is used, so that the two-bus circuit can cope with the requirements of various bus voltages and power grades; the N-type MOSFET is designed to the negative end of the two buses, so that the driving is convenient; meanwhile, a short-circuit protection module and an overcurrent protection module are arranged in the circuit, so that the safety and the reliability of the circuit are improved.
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a block diagram of a first embodiment of a two-bus circuit according to the present invention.
Fig. 2 is a schematic circuit diagram of a two-bus circuit in fig. 1.
Fig. 3 is a schematic circuit diagram of the output module 11 in fig. 2.
Fig. 4 is a circuit diagram of a first embodiment of the discharging module 21 in fig. 1.
Fig. 5 is a circuit diagram of a second embodiment of the discharging module 21 in fig. 1.
Fig. 6 is a circuit diagram of a third embodiment of the discharging module 21 in fig. 1.
Fig. 7 is a circuit schematic of the code detection module 31 in fig. 2.
Fig. 8 is a schematic circuit diagram of the output module 11 and the short-circuit protection module 41 in fig. 2.
Fig. 9 is a circuit schematic diagram of the output module 11 and the overcurrent protection module 51 in fig. 2.
FIG. 10 is a block diagram of a second embodiment of a two-bus circuit according to the present invention.
Fig. 11 is a circuit schematic of the output module 12 in fig. 10.
Fig. 12 is a circuit diagram of the code determining module 62 in fig. 10.
Fig. 13 is a circuit diagram of the code detection module 32 in fig. 10.
Fig. 14 is a schematic circuit diagram of the output module 12 and the short-circuit protection module 42 in fig. 10.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Fig. 1 is a block diagram of a first embodiment of a two-bus circuit according to the present invention, in which only one pair of two buses is in use, the two buses including a bus Ln11 and a bus Ln12. As shown in fig. 1, a two-bus circuit includes an output module 11, a discharge module 21, a code detection module 31, a short-circuit protection module 41, and an overcurrent protection module 51. The input end of the output module 11 is connected with a power supply Vcc1, the output end of the output module 11 is a bus Ln11 and a bus Ln12, and the output module 11 controls the voltage output on the two buses; the output module 11 is connected with the discharge module 21, and the discharge module 21 has the functions of rapidly raising the voltage on the bus Ln12 to the voltage Vcc1 and discharging the energy in the load; the two buses Ln11 and Ln12 are connected with the code return detection module 31, and the code return detection module 31 judges whether the equipment is in normal communication by detecting the code return current of the equipment connected in parallel between the two buses; the output module 11 is connected with the short-circuit protection module 41 and the overcurrent protection module 51, the short-circuit protection module 41 has the function of ensuring that a switch tube is turned off to perform short-circuit protection on a circuit when a large current flows, and the overcurrent protection module 51 detects the output current to perform overcurrent protection on the circuit. Optionally, the short-circuit protection module 41 and the overcurrent protection module 51 are connected to the same end of the output module 11.
FIG. 2 is a schematic circuit diagram of a first embodiment of the two-bus circuit of the present invention shown in FIG. 1. As shown IN fig. 2, the input end of the output module 11 is a port IN1, the port IN1 is an I/O port of the single chip microcomputer, the port IN1 is connected to a first end of a resistor R1, a second end of the resistor R1 is connected to a gate of a MOSFET Q1, a drain of the MOSFET Q1 is connected to a bus Ln11 through a resistor R2, a drain of the MOSFET Q1 is connected to a base of the transistor Q2, a collector of the transistor Q2 is connected to the bus Ln11 through a resistor R3, a collector of the transistor Q2 is connected to a base of the transistor Q3 and a base of a transistor Q4, an emitter of the transistor Q4 is connected to a base of the transistor Q5, an emitter of the transistor Q5 is connected to an emitter of the transistor Q3, a collector of the transistor Q5 is connected to a collector of the transistor Q4, a drain of the transistor Q4 is connected to a first end of the resistor R5 through a resistor R4, a second end of the resistor R5 is connected to the bus Ln11, a collector of the transistor Q3 is connected to a base of the transistor Q6, and a drain of the transistor Q6 is connected to a ground through a resistor R6, and a drain of the MOSFET Q6 is connected to a drain of the resistor Q6. The resistor R4 and the resistor R5 are connected in series, the midpoint of the series is connected with the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 is grounded, the cathode of the zener diode ZD1 is connected with the positive electrode of the capacitor C1, the anode of the zener diode ZD1 is grounded, the drain electrode of the MOSFET Q6 is connected with the bus Ln12, the bus Ln12 is connected with the output end OUT1 of the output module 11, and the bus Ln11 is connected with the power supply Vcc1. The triode Q2, the triode Q4 and the triode Q5 are NPN type triodes respectively, and the triode Q3 is a PNP type triode; the capacitor C1 is an electrolytic capacitor. The triode Q2, the triode Q3, the triode Q4 and the triode Q5 form a push-pull circuit, and signals output by the I/O port IN1 of the singlechip are amplified so that the MOSFET Q6 can be driven. The MOSFET Q1 and the MOSFET Q6 are N-type MOSFETs. Wherein, triode Q4, triode Q5 can replace with an NPN triode.
IN fig. 2, the discharging module 211 is a specific embodiment of the discharging module 21 IN fig. 1, the input end of the discharging module 211 is a port IN2, the port IN2 is an I/O port of the single chip microcomputer, the port IN2 is connected with a base electrode of the triode Q9 through a resistor R12, an emitter electrode of the triode Q9 is grounded, a collector electrode of the triode Q9 is connected with a collector electrode of the triode Q10 through a resistor R13, an emitter electrode of the triode Q10 is connected with the power supply Vcc1, a base electrode of the triode Q10 is connected with an emitter electrode of the triode Q11 through a resistor R14, a base electrode of the triode Q11 is connected with an emitter electrode of the triode Q12, a base electrode of the triode Q12 is connected with a collector electrode of the triode Q10, a resistor R15 is connected between the emitter electrode of the triode Q10 and the collector electrode of the triode Q11 IN parallel, and a resistor R16 is connected between the emitter electrode of the triode Q10 and the collector electrode of the triode Q12 IN parallel. The collector of the triode Q11 is connected with the collector of the triode Q12 and then connected to the output end OUT1 of the output module 11. The triode Q9 is an NPN triode, and the triode Q10, the triode Q11 and the triode Q12 are PNP triodes.
IN fig. 5, the discharging module 212 is another embodiment of the discharging module 21 shown IN fig. 1, the input end of the discharging module 212 is a port IN2, the port IN2 is an I/O port of the single chip microcomputer, the port IN2 is connected to the base of the triode Q23 through a resistor R41, the emitter of the triode Q23 is grounded, the collector of the triode Q23 is connected to the collector of the triode Q24 through a resistor R42, the emitter of the triode Q24 is connected to the power supply Vcc1, the base of the triode Q24 is connected to the source of the MOSFET Q25 through a resistor R43, the gate of the MOSFET Q25 is connected to the collector of the triode Q24, a resistor R44 is connected IN parallel between the emitter and the collector of the triode Q24, a resistor R45 is connected IN parallel between the base of the triode Q24 and the drain of the MOSFET Q25, the cathode of the zener diode ZD4 is connected to the source of the MOSFET Q25, the gate of the MOSFET ZD4 is connected to the drain of the MOSFET Q25, and the output end of the MOSFET 1 is connected to the output end of the MOSFET Q25. The triode Q23 is an NPN triode, the triode Q24 is a PNP triode, and the MOSFET Q25 is a P type MOSFET.
IN fig. 6, the discharging module 213 is a further embodiment of the discharging module 21 shown IN fig. 1, the input end of the discharging module 213 is a port IN2, the port IN2 is connected to the base of the transistor Q26 through a resistor R47, the emitter of the transistor Q26 is grounded, the collector of the transistor Q26 is connected to the gate of the MOSFET Q27 through a resistor R48, the source of the MOSFET Q27 is connected to the power supply Vcc1, the first end of the resistor R49 is connected to the gate of the MOSFET Q27, the second end of the resistor R49 is connected to the power supply Vcc1, and the drain of the MOSFET Q27 is connected to the output end OUT1 of the output module 11 through a resistor R50. The triode Q26 is an NPN triode, and the MOSFET Q27 is a P-type MOSFET.
The input end of the code detection module 31 is a port IN3, the port IN3 is an I/O port of the singlechip, the port IN3 is connected with the base electrode of the triode Q19 through a resistor R34, the emitter electrode of the triode Q19 is grounded, the collector electrode of the triode Q19 is connected with the base electrode of the triode Q20 through a resistor R35, the emitter electrode of the triode Q20 is connected with a power supply Vcc1, the collector electrode of the triode Q20 is connected with the anode of a voltage stabilizing diode ZD3, the power supply Vcc1 is connected with the cathode of the voltage stabilizing diode ZD3, the output end OUT1 is connected with the emitter electrode of the triode Q21, the base electrode of the triode Q21 is connected with the emitter electrode of the triode Q22, the anode of the voltage stabilizing diode ZD3 is connected with the base electrode of the triode Q22 through a resistor R35, the resistor R36 is connected between the base electrode of the triode Q22 and the ground GND, the first end of the triode Q22 is connected with the resistor R38 through the collector electrode of the resistor R37, the second end of the resistor OUT1 is connected with the collector electrode of the triode Q40, the second end of the resistor OUT 40 is connected with the second end of the singlechip, and the second end of the resistor OUT 40 is connected with the resistor R40 IN series. The triode Q19 is an NPN triode, and the triode Q21, the triode Q22 and the triode Q20 are PNP triodes.
The port OUT3 of the short-circuit protection module 41 is an I/O port of a singlechip, the port OUT3 is connected with a collector of a triode Q17, an emitter of the triode Q17 is grounded, the collector of the triode Q17 is connected with the power supply Vcc2, the collector of the triode Q17 is connected with a base of a triode Q18, the collector of the triode Q18 is connected with the base of the triode Q17, the emitter of the triode Q18 is connected with a grid of a MOSFET Q1, the collector of the triode Q18 is grounded, a first end of a resistor R27 is connected with the collector of the triode Q18, a second end of the resistor R27 is grounded, a first end of a resistor R28 is connected with the collector of the triode Q18, and a second end of the resistor R28 is connected with a source of the MOSFET Q6. The triode Q17 is an NPN triode, and the triode Q18 is a PNP triode.
The input end of the over-current protection module 51 is connected with the source of the MOSFET Q6, the input end of the over-current protection module 51 is connected with the first end of a resistor R29, the second end of the resistor R29 is connected with the first end of a resistor R30, the second end of the resistor R30 is connected with a power supply Vcc2, the input positive end of the operational amplifier A1 is connected with the midpoint of the series connection of the resistor R29 and the resistor R30, the input negative end of the operational amplifier A1 is grounded through a resistor R31, a capacitor C5 is connected in parallel between the input negative end and the output end of the operational amplifier A1, a resistor R32 is connected in parallel with the two ends of the capacitor C5, the output end of the operational amplifier A1 is connected with the first end of the capacitor C6 through a resistor R33, the second end of the capacitor C6 is grounded, a diode D7 is connected in series between the input positive end and the ground of the operational amplifier A1 in an anti-parallel manner, the first end of the capacitor C6 is the output end OUT4 of the over-current protection module 51, and the output end OUT4 is a single chip microcomputer I/O.
The following describes the operation principle of a two-bus circuit according to the present invention with reference to fig. 3 to 9. Fig. 3 is a schematic circuit diagram of the output module 11 in fig. 2, and the working principle of the output module 11 will be described with reference to fig. 3. The output module 11 controls the voltage on the two buses by controlling the on-off of the MOSFET Q6, and the MOSFET Q6 is connected to the negative terminal of the two buses, namely Ln12, so that the driving is convenient. When the port IN1 is at a high level, the two buses are IN a power supply mode, more specifically, the MOSFET Q1 is turned on at this time, the MOSFET Q6 is turned on under the action of the transistor Q2, the transistor Q3, the transistor Q4, and the transistor Q5, and the voltage Vcc1 is output between the two buses Ln11 and Ln12 under the action of the power supply Vcc1.
When the port IN1 has a high-low level change, the two buses are IN a communication mode, more specifically, the MOSFET Q1 is turned off at this time, the MOSFET Q6 is turned off under the action of the transistors Q2, Q3, Q4 and Q5, the bus Ln12 is connected to the port OUT1, at this time, the discharging module 211 works to quickly pull up the voltage on the bus Ln12 to the voltage Vcc1, and discharge the residual electric quantity between the two buses Ln11 and Ln 12.
Fig. 4 is a schematic circuit diagram of the discharging module 211 in fig. 2, and the working principle of the discharging module 211 will be described with reference to fig. 4. When the port IN1 is at a high level, the port IN2 is at a low level, and the discharging module 211 does not operate.
When the port IN1 has high and low level change, the singlechip makes the port IN2 be high level, so that the triode Q9 is conducted, the collector potential of the triode Q10 is pulled down at the moment, the triode Q11, the triode Q12 and the triode Q10 are conducted, the triode Q10, the triode Q11 and the triode Q12 work IN an amplifying region at the moment, the voltage of the port OUT1 is approximately equal to the voltage of the power supply Vcc1 at the moment, and the load is discharged, so that the voltage on the bus Ln12 is rapidly pulled up to the voltage Vcc1, and equipotential of two buses Ln11 and Ln12 is formed.
Fig. 7 is a schematic circuit diagram of the code detection module 31 in fig. 2, and the working principle of the code detection module 31 will be described with reference to fig. 7. The code-back detection module 31 performs code-back detection when the port IN1 has a high-low level change and the voltage on the bus Ln12 is pulled up to the voltage Vcc1, and is used for detecting the code-back current of the device, so as to determine whether the communication is normal. When the port IN3 is at a high level, the triode Q19 is turned on, the triode Q20 is turned on, the anode of the zener diode ZD3 is a voltage Vcc1, the triode Q21 is turned off, and the triode Q22 is turned off, so that a code returning platform is not generated.
When the port IN3 is at a low level, the triode Q19 is turned off, the triode Q20 is turned off, the zener diode ZD3 is connected to the circuit, the triode Q21 is turned on, the triode Q22 is turned on, and the base voltage of the triode Q22 is Vcc1-U ZD3 Wherein U is ZD3 For the reverse breakdown voltage of the zener diode ZD3, v4=u will be generated between the two buses Ln11 and Ln12 during the code returning ZD3 -2*V PN The left-right potential difference, i.e., the code return table, is generated by the device at which time the device returns code, which in one embodiment may be a current code return.The current will generate a voltage drop across the resistor R38, and in a specific embodiment, the output terminal OUT5 samples the voltage across the resistor R40, so as to determine whether the device performs the code returning according to the sampled voltage value.
Fig. 8 is a schematic circuit diagram of the output module 11 and the short-circuit protection module 41 in fig. 2, and the working principle of the short-circuit protection module 41 will be described with reference to fig. 8. The short-circuit protection module 41 collects the current flowing through the resistor R8 to determine whether short-circuit protection is needed, when the MOSFET Q6 is turned on, the resistor R8 has current flowing, when the current flowing through the MOSFET Q6 is greater than a set value, that is, the potential of the source of the MOSFET Q6 is greater than the set value, that is, the potential of the base of the triode Q17 is greater than the voltage V after the voltage of the source of the MOSFET Q6 is divided by the resistor R27 and the resistor R28 PN When the triode Q17 is turned on, the triode Q18 is turned on, a larger current is provided for the base electrode of the triode Q17 to lock the base electrode voltage of the triode Q17, the voltage at the second end of the resistor R1 is approximately equal to the ground, and then the grid voltage of the MOSFET Q1 is pulled down, so that the MOSFET Q1 is turned off, the MOSFET Q6 is turned off, and the MOSFET Q6 is turned off under the condition of high current, so that short-circuit protection is realized. Wherein the voltage V PN Is the voltage drop of one PN junction. The port OUT3 is a short-circuit signal acquisition port, the port OUT3 is connected with an input I/O port of the singlechip, and can continuously acquire the voltage of the collector electrode of the triode Q17 to judge whether short-circuit protection needs to be triggered or not. When the voltage of the collector electrode of the triode Q17 is larger than a set value, the short circuit is not generated; and when the voltage of the collector electrode of the triode Q17 is not greater than the set value, indicating that a short circuit occurs, and controlling the turn-off circuit by the singlechip.
Fig. 9 is a schematic circuit diagram of the output module 11 and the over-current protection module 51 in fig. 1, and the working principle of the over-current protection module 51 will be described with reference to fig. 9. When current flows through the resistor R8, the first end of the resistor R29 generates a voltage drop to the ground, namely a voltage V3, the voltage V3 is sampled and amplified by the operational amplifier A1 and then is output to the singlechip at the output end OUT4, the current flowing through the resistor R8 can be obtained after AD sampling processing is performed by the singlechip, and when the current flowing through the resistor R8 is larger than a set overcurrent protection point, overcurrent protection is triggered. The resistor R30 has a calibration function, and the diode D7 and the diode D8 have a protection function to prevent circuit damage.
When a plurality of pairs of two buses are put into use, a short-circuit protection module and an overcurrent protection module are respectively arranged for the output modules of each pair of two buses and used for carrying out short-circuit protection and overcurrent protection on the circuit; meanwhile, a code return judging module can be provided for the output module of each pair of two buses and is used for judging which pair of two buses need code return detection at present; the output modules of the many-to-two buses can share a discharge module and a code return detection module.
Fig. 10 is a block diagram of a second embodiment of a two-bus circuit according to the present invention, in which there are 4 pairs of two buses, namely, bus Ln21 and bus Ln22, bus Ln31 and bus Ln32, bus Ln41 and bus Ln42, and bus Ln51 and bus Ln52, respectively. As shown in fig. 10, an input end of the output module 12 is connected to a power supply Vcc1, an output end of the output module 12 is a bus Ln21 and a bus Ln22, and the output module 12 controls voltage output on the two buses Ln21 and Ln 22; the output module 12 is connected with the discharging module 22, and the discharging module 22 has the function of rapidly raising the voltage on the bus Ln22 to the voltage Vcc1 and discharging the load; the two buses Ln21 and Ln22 are connected with the code return judging module 62, the code return judging module 62 is connected with the code return detecting module 32, the code return judging module 62 judges whether the output module 12 needs code return, and the code return detecting module 32 judges whether the equipment is normally communicated by detecting the code return current of the equipment connected in parallel between the two buses; the output module 12 is connected with the short-circuit protection module 42 and the overcurrent protection module 52, the short-circuit protection module 42 has the function of ensuring that a switch tube is turned off to perform short-circuit protection on a circuit when a large current flows, and the overcurrent protection module 52 detects the output current to perform overcurrent protection on the circuit. Optionally, the short-circuit protection module 42 and the overcurrent protection module 52 are connected to the same end of the output module 12.
The input end of the output module 13 is connected with a power supply Vcc1, the output end of the output module 13 is a bus Ln31 and a bus Ln32, and the output module 13 controls the voltage output on the two buses Ln31 and Ln 32; the output module 13 is connected with the discharging module 22, and the discharging module 22 has the function of rapidly raising the voltage on the bus Ln32 to the voltage Vcc1 and discharging the load; the two buses Ln31 and Ln32 are connected with the code return judging module 63, the code return judging module 63 is connected with the code return detecting module 32, the code return judging module 62 judges whether the output module 13 needs code return, and the code return detecting module 32 judges whether the equipment is normally communicated by detecting the code return current of the equipment connected in parallel between the two buses; the output module 13 is connected with the short-circuit protection module 43 and the overcurrent protection module 53, the short-circuit protection module 43 has the function of ensuring that a switch tube is turned off to perform short-circuit protection on a circuit when a large current flows, and the overcurrent protection module 53 detects the output current to perform overcurrent protection on the circuit. Optionally, the short-circuit protection module 43 and the overcurrent protection module 53 are connected to the same end of the output module 13.
The input end of the output module 14 is connected with a power supply Vcc1, the output end of the output module 14 is a bus Ln41 and a bus Ln42, and the output module 14 controls the voltage output on the two buses Ln41 and Ln 42; the output module 14 is connected with the discharging module 22, and the discharging module 22 has the function of rapidly raising the voltage on the bus Ln42 to the voltage Vcc1 and discharging the load; the two buses Ln41 and Ln42 are connected with the code return judging module 64, the code return judging module 64 is connected with the code return detecting module 32, the code return judging module 64 judges whether the output module 14 needs code return, and the code return detecting module 32 judges whether the equipment is normally communicated by detecting the code return current of the equipment connected in parallel between the two buses; the output module 14 is connected with the short-circuit protection module 44 and the overcurrent protection module 54, the short-circuit protection module 44 is used for guaranteeing that a switch tube is turned off to perform short-circuit protection on a circuit in the case of high current, and the overcurrent protection module 54 is used for detecting output current to perform overcurrent protection on the circuit. Optionally, the short-circuit protection module 44, the overcurrent protection module 54 are connected to the same end of the output module 14.
The input end of the output module 15 is connected with a power supply Vcc1, the output end of the output module 15 is a bus Ln51 and a bus Ln52, and the output module 15 controls the voltage output on the two buses Ln51 and Ln 52; the output module 15 is connected with the discharging module 22, and the discharging module 22 has the function of rapidly raising the voltage on the bus Ln52 to the voltage Vcc1 and discharging the load; the two buses Ln51 and Ln52 are connected with the code return judging module 65, the code return judging module 65 is connected with the code return detecting module 32, the code return judging module 65 judges whether the output module 15 needs code return, and the code return detecting module 32 judges whether the equipment is normally communicated by detecting the code return current of the equipment connected in parallel between the two buses; the output module 15 is connected with the short-circuit protection module 45 and the overcurrent protection module 55, the short-circuit protection module 45 has the function of ensuring that a switch tube is turned off to perform short-circuit protection on a circuit when a large current flows, and the overcurrent protection module 55 detects the output current to perform overcurrent protection on the circuit. Optionally, the short-circuit protection module 45 and the overcurrent protection module 55 are connected to the same end of the output module 15.
Fig. 11 is a schematic circuit diagram of the output module 12 shown in fig. 10, and in this embodiment, compared to the circuit of the output module 11 in fig. 3, a discharge judgment branch is added to the output module 12, and the discharge judgment branch includes a resistor R11, a triode Q8, a diode D1, a capacitor C2, a resistor R9, a resistor R10, a diode D2, a MOSFET Q7, and a diode D3. The input end of the output module 12 is a port IN1, the port IN1 is an I/O port of a singlechip, the port IN1 is connected with a first end of a resistor R1, a second end of the resistor R1 is connected with a grid electrode of a MOSFET Q1, a drain electrode of the MOSFET Q1 is connected to a bus Ln21 through a resistor R2, a drain electrode of the MOSFET Q1 is connected with a base electrode of the MOSFET Q2, a collector electrode of the MOSFET Q2 is connected to the bus Ln21 through a resistor R3, a collector electrode of the triode Q2 is connected with a base electrode of the triode Q3 and a base electrode of a triode Q4, an emitter electrode of the triode Q5 is connected with an emitter electrode of the triode Q3, a collector electrode of the triode Q5 is connected with a collector electrode of the triode Q4, a collector electrode of the triode Q4 is connected with a first end of the resistor R5 through the resistor R4, a second end of the resistor R5 is connected with the bus Ln21, a collector electrode of the triode Q3 is connected with a second end of the MOSFET Q6 through the resistor R6, and a drain electrode of the MOSFET Q6 is connected with the ground, and the drain electrode of the MOSFET Q6 is connected with the resistor Q6 is connected with the drain electrode of the resistor Q6. The resistor R4 is connected with the positive electrode of the capacitor C1 at the midpoint of the series connection of the resistor R5, the negative electrode of the capacitor C1 is grounded, the negative electrode of the voltage stabilizing diode ZD1 is connected with the positive electrode of the capacitor C1, the positive electrode of the voltage stabilizing diode ZD1 is grounded, the positive electrode of the diode D1 is connected with the negative electrode of the voltage stabilizing diode ZD1, the negative electrode of the diode D1 is connected with the drain electrode of the MOSFET Q6 through the capacitor C2, the drain electrode of the MOSFET Q6 is connected with the bus Ln22, the negative electrode of the diode D1 is connected with the first end of the resistor R10 through the resistor R9, the second end of the resistor R10 is connected with the grid electrode of the MOSFET Q7, the source electrode of the MOSFET Q7 is connected with the bus Ln22, the negative electrode of the diode D2 is connected with the grid electrode of the MOSFET Q7, the drain electrode of the diode D3 is connected with the negative electrode of the diode D3, and the positive electrode of the diode D3 is the output end OUT1 of the output module 12. The port IN1 is connected with the base electrode of the triode Q8 through a resistor R11, the collector electrode of the triode Q8 is connected with the series midpoint of the resistor R9 and the resistor R10, the emitter electrode of the triode Q8 is grounded, and the bus Ln21 is connected with a power supply Vcc1. The triode Q2, the triode Q4, the triode Q5 and the triode Q8 are NPN type triodes respectively, and the triode Q3 is a PNP type triode; the capacitor C1 is an electrolytic capacitor. The triode Q2, the triode Q3, the triode Q4 and the triode Q5 form a push-pull circuit, and signals output by an I/O port IN1 of the singlechip are amplified to drive the MOSFET Q6, the MOSFET Q1, the MOSFET Q6 and the MOSFET Q7 are N-type MOSFETs, and the triode Q4 and the triode Q5 can be replaced by 1 NPN type triode.
The output module 12 controls the voltage on the two buses by controlling the on-off of the MOSFET Q6, and the MOSFET Q6 is connected to the negative terminal of the two buses, namely Ln22, so that the driving is convenient. When the port IN1 is at a high level, the two buses are IN a power supply mode, more specifically, the MOSFET Q1 is turned on at this time, the MOSFET Q6 is turned on under the action of the transistor Q2, the transistor Q3, the transistor Q4, and the transistor Q5, and the voltage Vcc1 is output between the two buses Ln21 and Ln22 under the action of the power supply Vcc1. Further, when the port IN1 is at a high level, the transistor Q8 is turned on, so that the MOSFET Q7 is IN an off state; under the action of the zener diode ZD1, the reverse breakdown voltage U of the zener diode ZD1 ZD1 The capacitor C2 is charged, providing for a fast turn-on of the MOSFET Q7 when the MOSFET Q6 is turned off.
When the port IN1 has a high-low level change, the two buses are IN a communication mode, more specifically, the MOSFET Q1 is turned off, the MOSFET Q6 is turned off under the action of the transistor Q2, the transistor Q3, the transistor Q4 and the transistor Q5, and the voltage on the capacitor C2 makes the MOSFET Q7 rapidly turned on, so that the bus Ln22 is connected to the port OUT1 through the MOSFET Q7 and the diode D3. At this time, the discharging module 22 operates to rapidly raise the voltage on the bus Ln22 to the voltage Vcc1, and discharge the residual electric power between the two buses Ln21 and Ln 22.
The specific embodiments and the working principles of the output module 13, the output module 14, and the output module 15 are the same as those of the specific embodiment and the working principle of the output module 12 in fig. 11, and are not described herein again. Under normal conditions, each output module is IN a power supply mode, when a certain output module is IN a communication mode, the corresponding port IN1 has high-low level change, the discharge judgment branch circuit enables the MOSFET Q7 to be conducted, so that the port OUT1 is connected with a discharge module, and the discharge module works.
The specific embodiment and the working principle of the discharging module 22 are the same as those of the discharging module described in fig. 4 to 6, and are not described herein.
Fig. 12 is a circuit schematic diagram of the code return judging module 62 shown IN fig. 10, the input end of the code return judging module 62 is a port IN4, the port IN4 is an I/O port of the single chip microcomputer, the port IN4 is connected with the base of the triode Q13 through the resistor R18, the emitter of the triode Q13 is grounded, the collector of the triode Q13 is connected with the first end of the resistor R20 through the resistor R19, and the second end of the resistor R20 is connected with the bus Ln21. The bus Ln22 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the source of the MOSFET Q14, the gate of the MOSFET Q14 is connected to the midpoint of the series connection of the resistor R19 and the resistor R20, and the drain of the MOSFET Q14 is used as the port P13. The triode Q13 is an NPN triode, and the MOSFETQ14 is a P-type MOSFET.
The specific embodiments and the working principles of the code returning determination module 63, the code returning determination module 64, and the code returning determination module 65 in fig. 10 are the same as those of the specific embodiment and the working principle of the code returning determination module 62 in fig. 12, and are not described herein.
Fig. 13 is a schematic circuit diagram of the code detection module 32 shown in fig. 10, the port P13 is connected to the emitter of the transistor Q15, the base of the transistor Q15 is connected to the emitter of the transistor Q16, and the collector of the transistor Q16 is connected to the collector of the transistor Q15. The power supply Vcc1 is connected with the cathode of the zener diode ZD2, the anode of the zener diode ZD2 is connected with the base electrode of the triode Q16, the resistor R21 is connected in parallel between the base electrode of the triode Q16 and the ground GND, the collector electrode of the triode Q16 is connected with the first end of the resistor R23 through the resistor R22, the second end of the resistor R23 is grounded, the resistor R24 is connected in series between the first end of the resistor R23 and the first end of the resistor R25, the second end of the resistor R25 is grounded, the first end of the resistor R25 is the output end OUT2 of the code return detection module 32, and the output end OUT2 is an I/O port of the singlechip. The triode Q15 and the triode Q16 are PNP type triodes.
When a certain output module needs to perform the code returning detection, the corresponding port IN1 has high-low level change. When the port IN4 is low, no code return stage is generated, the transistor Q13 is turned off, and the MOSFET Q14 is turned off.
When the port IN4 is at high level, the transistor Q13 is turned on, the voltage Vcc1 on the bus Ln21 is divided by the resistor R19 and the resistor R20, a voltage V1 is generated at the gate of the MOSFET Q14 to turn on the MOSFET Q14, the port P13 is connected to the bus Ln22, the base voltage of the transistor Q16 is Vcc1-U ZD2 Wherein U is ZD2 For the reverse breakdown voltage of the zener diode ZD2, the transistor Q15 and the transistor Q16 are turned on, and v2=u is generated between the two buses Ln21 and Ln22 during the code return ZD2 -2*V PN The left-right potential difference, i.e., the code return table, is generated by the device at which time the device returns code, which in one embodiment may be a current code return. The current will generate a voltage drop across the resistor R23, and in a specific embodiment, the output terminal OUT2 samples the voltage across the resistor R25, so as to determine whether the device performs the code returning according to the sampled voltage value.
The specific embodiments and the working principles of the short-circuit protection module 42, the short-circuit protection module 43, the short-circuit protection module 44, and the short-circuit protection module 45 in fig. 10 are the same as those of the specific embodiment and the working principle of the short-circuit protection module 41 in fig. 8, and it should be noted that if the port OUT3 of each short-circuit protection module is connected to the same I/O port of the singlechip, a diode D6 needs to be connected in series between the port OUT3 of each short-circuit protection module and the collector of the triode Q17 for isolation, as shown in fig. 14, the anode of the diode D6 is connected to the port OUT3, and the cathode of the diode D6 is connected to the collector of the triode Q17. If the port OUT3 of each short-circuit protection module is respectively connected to different I/O ports of the singlechip, the diode D6 is not needed.
The specific embodiments and the working principles of the overcurrent protection module 52, the overcurrent protection module 53, the overcurrent protection module 54, and the overcurrent protection module 55 in fig. 10 are the same as those of the specific embodiment and the working principle of the overcurrent protection module 51 in fig. 9, and are not repeated here.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, but rather is capable of modification and variation without departing from the spirit and scope of the present invention.

Claims (17)

1. The two-bus circuit is characterized by comprising an output module, a discharge module and a code return detection module, wherein the input of the output module is connected with a power supply, the output of the output module is two buses, the two buses comprise a first bus and a second bus, the output module is connected with the discharge module, and the code return detection module is connected with the two buses in parallel; the discharging module pulls up the voltage on the second bus to a power supply voltage and finishes discharging energy in a load; the code return detection module judges whether the equipment is normally communicated by detecting code return current of the equipment connected in parallel between the two buses;
the output module comprises a plurality of switching tubes, a plurality of triodes, a first voltage stabilizing diode and a first resistor, wherein the first bus is connected with a first power supply, a first input end is connected with a grid electrode of the first switching tube, a source electrode of the first switching tube is grounded, a drain electrode of the first switching tube is connected with a base electrode of the first triode, a base electrode of the first triode is connected with the first bus, an emitter electrode of the first triode is grounded, a collector electrode of the first triode is connected with the first bus, a collector electrode of the first triode is connected with a base electrode of a second triode and a base electrode of a third triode, a collector electrode of the second triode is grounded, an emitter electrode of the third triode is connected with a base electrode of a fourth triode, a collector electrode of the fourth triode is connected with the second triode, a collector electrode of the second triode is connected with a drain electrode of the second diode, and the second resistor is grounded.
2. The two-bus circuit of claim 1, wherein the output module further comprises a fifth triode, a first capacitor, a third switch tube and a plurality of diodes, wherein an anode of the first diode is connected with a cathode of the first zener diode, a cathode of the first diode is connected with a first end of the first capacitor, a second end of the first capacitor is connected with a drain of the second switch tube, a source of the third switch tube is connected with the second bus, a cathode of the second diode is connected with a gate of the third switch tube, an anode of the second diode is connected with a source of the third switch tube, a drain of the third switch tube is connected with a cathode of the third diode, an anode of the third diode is connected with a first output end, a first input end is connected with a base of the fifth triode, an emitter of the fifth diode is grounded, and a collector of the fifth transistor is connected with the gate of the third switch tube and the first end of the first capacitor.
3. The two-bus circuit of claim 1, wherein the discharging module comprises a plurality of triodes, the second input terminal is connected with the base electrode of a sixth triode, the emitter electrode of the sixth triode is grounded, the collector electrode of the sixth triode is connected with the collector electrode of a seventh triode, the emitter electrode of the seventh triode is connected with the first power supply, the emitter electrode of the eighth triode is connected with the base electrode of the seventh triode, the base electrode of the eighth triode is connected with the emitter electrode of a ninth triode, the base electrode of the ninth triode is connected with the collector electrode of the seventh triode, the collector electrode of the eighth triode and the collector electrode of the ninth triode are connected with the first output terminal, and the first output terminal is connected with the base electrode of the seventh triode.
4. The two-bus circuit as set forth in claim 1, further comprising a code-returning judging module, wherein the code-returning judging module comprises a tenth triode, a second resistor, a third resistor, a fourth switching tube and a fourth diode, the third input end is connected with the base electrode of the thirteenth diode, the emitter electrode of the tenth triode is grounded, the collector electrode of the tenth triode is connected with the grid electrode of the fourth switching tube through the second resistor, the grid electrode of the fourth switching tube is connected with the first bus through the third resistor, the second bus is connected with the anode of the fourth diode, the cathode of the fourth diode is connected with the source electrode of the fourth switching tube, and the drain electrode of the fourth switching tube is connected with the first middle end.
5. The two-bus circuit as set forth in claim 4, wherein the code-return detection module comprises a plurality of triodes, a plurality of resistors, and a second zener diode, wherein the first intermediate terminal is connected to the emitter of the eleventh triode, the base of the eleventh triode is connected to the emitter of the twelfth triode, the collector of the twelfth triode is connected to the collector of the eleventh triode, the base of the twelfth triode is connected to the anode of the second zener diode, the cathode of the second zener diode is connected to the first power supply, the first terminal of the fourth resistor is connected to the base of the twelfth triode, the second terminal of the fourth resistor is grounded, the collector of the twelfth triode is connected to the first terminal of the fifth resistor, the second terminal of the fifth resistor is grounded, and the second terminal of the fifth resistor is connected to the second output terminal.
6. The two-bus circuit of claim 1 further comprising a short-circuit protection module, the short-circuit protection module coupled to the output module.
7. The two-bus circuit of claim 6, wherein the short-circuit protection module comprises a plurality of triodes, a plurality of resistors, a third output terminal is connected with a collector of a thirteenth triode and a base of a fourteenth triode, the collector of the thirteenth triode is connected with a second power supply, an emitter of the thirteenth triode is grounded, the base of the thirteenth triode is connected with the collector of the fourteenth triode, the emitter of the fourteenth triode is connected with the gate of the first switch tube, the collector of the fourteenth triode is grounded, a first end of a sixth resistor is connected with the collector of the fourteenth triode, a second end of the sixth resistor is grounded, a first end of the sixth resistor is connected with a first end of a seventh resistor, and a second end of the seventh resistor is connected with the source of the second switch tube.
8. The two-bus circuit of claim 7, wherein the short-circuit protection module further comprises a fifth diode, an anode of the fifth diode being coupled to the third output terminal, and a cathode of the fifth diode being coupled to a collector of the thirteenth transistor.
9. The two-bus circuit of claim 1 further comprising an over-current protection module coupled to the output module.
10. The two-bus circuit as set forth in claim 9, wherein the over-current protection module comprises a first operational amplifier, a source of the second switching tube is connected to an input positive terminal of the first operational amplifier, an input negative terminal of the first operational amplifier is grounded, and an output terminal of the first operational amplifier is connected to a fourth output terminal.
11. The two-bus circuit as set forth in claim 1, wherein the code-return detection module includes a plurality of triodes, a plurality of resistors, and a third zener diode, the fourth input terminal is connected to the base of the fifteenth triode, the emitter of the fifteenth triode is grounded, the collector of the fifteenth triode is connected to the base of the sixteenth triode, the emitter of the sixteenth triode is connected to the first power supply and the cathode of the third zener diode, the collector of the sixteenth triode is connected to the anode of the third zener diode, the first output terminal is connected to the emitter of the seventeenth triode, the base of the seventeenth triode is connected to the emitter of the eighteenth triode, the base of the eighteenth triode is connected to the collector of the seventeenth triode, the first end of the eighth resistor is connected to the base of the eighteenth triode, the second end of the eighth resistor is grounded, the first end of the seventeenth resistor is connected to the anode of the ninth resistor, and the second end of the ninth resistor is connected to the fifth end of the ninth resistor.
12. The two-bus circuit of claim 1, wherein the discharging module comprises a nineteenth transistor, a twentieth transistor, a fourth zener diode, and a fifth switching tube, wherein a fifth input terminal is connected to a base of the nineteenth transistor, an emitter of the nineteenth transistor is grounded, a collector of the nineteenth transistor is connected to a collector of the twentieth transistor, an emitter of the twentieth transistor is connected to the first power supply, a base of the twentieth transistor is connected to a source of the fifth switching tube, a gate of the fifth switching tube is connected to a collector of the twentieth transistor, a drain of the fifth switching tube is connected to the first output terminal, a cathode of the fourth zener diode is connected to a source of the fifth switching tube, and an anode of the fourth zener diode is connected to a gate of the fifth switching tube.
13. The two-bus circuit of claim 1, wherein the discharging module comprises a twenty-first triode and a sixth switching tube, a sixth input terminal is connected with a base electrode of the twenty-first triode, an emitter electrode of the twenty-first triode is grounded, a collector electrode of the twenty-first triode is connected with a grid electrode of the sixth switching tube, a source electrode of the sixth switching tube is connected with the first power supply, and a drain electrode of the sixth switching tube is connected with the first output terminal.
14. The two-bus circuit of claim 1, wherein the first switching tube and the second switching tube are N-type MOSFETs.
15. The two-bus circuit of claim 2 wherein the third switching tube is an N-type MOSFET.
16. The two-bus circuit of claim 4 wherein the fourth switching tube is a P-type MOSFET.
17. A two-bus circuit comprising a plurality of two-bus circuits as claimed in any one of claims 1 to 16.
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