CN218734272U

CN218734272U - Terminal switching value detection circuit

Info

Publication number: CN218734272U
Application number: CN202222955587.4U
Authority: CN
Inventors: 邢迪; 刘校峰; 叶孟军
Original assignee: Ningbo Sanxing Medical and Electric Co Ltd
Current assignee: Ningbo Sanxing Medical and Electric Co Ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-24
Anticipated expiration: 2032-11-07

Abstract

The utility model provides a terminal switching value detection circuitry, including signal acquisition circuit and isolating circuit, signal acquisition circuit input side is connected with on-the-spot switching value device, signal acquisition circuit output side is connected with treater MCU through isolating circuit, the isolating circuit part is including keeping apart the chip, signal acquisition circuit output side is connected with the input side of keeping apart the chip through second isolation resistance component, the output side of keeping apart the chip is connected with MCU's IO, MCU is connected with the power terminal, MCU keeps apart the chip and is used for exporting the trigger signal that signal acquisition circuit produced for MCU to handle; through a terminal switch volume detection circuitry, can improve the application scope of circuit, satisfy the detection demand when terminal switch volume demand number is more, and circuit structure is simple, effectively reduces the space occupancy of circuit, reduces the cost of circuit, improves the detection efficiency of circuit, reinforcing circuit's stability, the accuracy that improves the circuit detection, the reliability of increase circuit operation.

Description

Terminal switching value detection circuit

Technical Field

The utility model relates to a power electronics field particularly, relates to a terminal switch volume detection circuitry.

Background

At present, the detection of switching values such as pulse signals, remote signaling signals and the like is widely used on an electric power acquisition terminal, the number of requirements for the detection of the switching values is continuously increased according to the technical specification requirements of the current national power grid, the detection scheme adopted in the prior art is mostly in a form of adding optical coupling isolation to a signal acquisition circuit, when the number of the switching value detection requirements is less, the scheme is more suitable for selection, but when the number of the detection requirements is increased, the scheme has serious defects.

In patent CN111307319A, a rail transportation battery module unit temperature acquisition and hardware protection device is mentioned, wherein the acquisition circuit includes 12 output signals of a unit temperature acquisition circuit, one side of the acquisition circuit is connected with a main CPU through an AD acquisition chip to acquire a unit temperature, the other side of the acquisition circuit enters a 12-way temperature comparison circuit to compare a real-time temperature with a set upper limit temperature, and the unit voltage comparison circuit specifically includes: when battery voltage reaches 3V, the 1 pin voltage that makes TLV431 by R3 and R4 partial pressure reaches 1.24V to TLV431 switches on, and then triode Q1 switches on the emitting diode circular telegram that makes the opto-coupler input, and the output switches on, and control relay output alarm signal, to a certain extent, the device can satisfy to the free temperature acquisition of battery and detect, but its device structure is complicated, still need adopt the opto-coupler, and the circuit device accounts for than the space big.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a terminal switching value detecting circuit, so as to solve the problem that the structure of the detecting circuit is complicated and cannot meet the requirement of detecting the terminal switching value when the terminal switching value is detected in the form of adding optical coupling isolation to a signal collecting circuit in the prior art; therefore, the application range of the circuit is widened, the detection requirement when the required number of the terminal switch quantity is large is met, the circuit is simplified, the space occupation rate of the circuit is reduced, the cost of the circuit is reduced, and the detection efficiency of the circuit is improved.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model relates to a terminal switching value detection circuitry, including signal acquisition circuit and buffer circuit, the signal acquisition circuit input side is connected with field switching value device, the signal acquisition circuit output side passes through buffer circuit and is connected with treater MCU, the buffer circuit part is including keeping apart the chip, the signal acquisition circuit output side is connected with the input side of keeping apart the chip through second isolation resistance subassembly, the output side of keeping apart the chip is connected with MCU's IO, MCU is connected with power terminal, MCU keeps apart the chip and is used for exporting the trigger signal that signal acquisition circuit produced for MCU to handle.

Furthermore, the isolation circuit comprises a first isolation resistance component, a second isolation resistance component, a third isolation resistance component and a fourth isolation resistance component, wherein the input end of the first isolation resistance component is connected with the input side power supply, the output end of the first isolation resistance component is connected with the input side of the isolation chip through the second isolation resistance component, the output side of the isolation chip is connected with the input end of the fourth isolation resistance component through the third isolation resistance component, and the output end of the fourth isolation resistance component is connected with the output side power supply.

Further, the first isolation resistance component, the second isolation resistance component, the third isolation resistance component and the fourth isolation resistance component all comprise at least one resistor.

Further, isolating the chip includes using NSIW-DSWR.

Further, the input side power supply and the output side power supply are two paths of power supplies, the input side power supply voltage is mV, and the output side power supply voltage is nV.

Further, the signal acquisition circuit comprises a first resistor R1, an eleventh resistor R11, a twentieth resistor R20, a seventeenth resistor R17, a third capacitor C3, a fifth capacitor C5, a seventh capacitor C7, a first triode V1, a second triode V3 and a diode VDa, wherein a cathode of the diode VDa is connected with the field switching value device through a signal input terminal, an anode of the diode VDa is respectively connected with an input end of the first resistor R1, an input end of the eleventh resistor R11 and an input end of the third capacitor C3, an output end of the third capacitor C3 is respectively connected with an output end of the first resistor R1, a power supply of the sampling module and an emitter of the first triode V1, an output end of the eleventh resistor R11 is connected with a base of the first triode V1, a collector of the first triode V1 is respectively connected with an input end of the seventeenth resistor R17 and an input end of the twentieth resistor R20, an output end of the seventeenth resistor R17 is respectively connected with an input end of the seventh capacitor C7 and a base of the second triode V3, an output end of the twenty resistor R20 is respectively connected with an output end of the seventh capacitor C7, a collector of the sampling module and an output terminal, and an isolation component, and an output terminal of the fifth triode and an isolation component are respectively arranged between the emitter of the collector of the first triode and an isolation resistor C5.

Further, at least one signal acquisition circuit is arranged.

Further, the first resistor R1 has a resistance = eleventh resistor R11 has a resistance = seventeenth resistor R17 has a resistance = twentieth resistor R20, and the third capacitor C3 has a capacitance = fifth capacitor C5 has a capacitance = seventh capacitor C7.

Further, the resistance value of the first isolation resistance component = the resistance value of the fourth isolation resistance component, and the resistance value of the second isolation resistance component = the resistance value of the third isolation resistance component.

Further, the first transistor V1 is 2SB1198, and the second transistor V3 is MMBT3904.

Compared with the prior art, a terminal switch volume detection circuitry, following beneficial effect has:

through the circuit can improve the application scope of circuit, satisfy the detection demand when terminal switching value demand number is more, and circuit structure is simpler, simplifies the circuit, reduces the use of device in the circuit, effectively reduces the space occupancy of circuit to reduce the cost of circuit, improve the detection efficiency of circuit, strengthen the stability of circuit, promote the protection to the circuit, improve the accuracy that the circuit detected, increase the reliability of circuit operation.

Drawings

Some of the figures that make up the present invention are intended to provide a further understanding of the invention, and the illustrative embodiments and descriptions thereof are intended to explain the present invention and not to constitute an undue limitation on the invention. In the drawings:

FIG. 1 is a schematic diagram of a switching value acquisition circuit in the prior art;

FIG. 2 is a schematic diagram of a single signal acquisition circuit;

fig. 3 is a schematic diagram of an isolation circuit.

Description of reference numerals: 1. an isolation circuit; 11. isolating the chip; 12. a first isolation resistive component; 13. a second isolation resistive component; 14. a third isolation resistance component; 15. a fourth isolation resistive component; 16. an input side power supply; 17. an output side power supply; 2. a signal acquisition circuit; 21. a sampling module power supply; 22. sampling and grounding; 23. a signal input terminal; 24. and a signal output terminal.

Detailed Description

The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These utility concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The present embodiment is directed to a switching value circuit, and the whole structure is composed of an acquisition circuit and a CPU, as in the conventional circuit.

In the prior art, the most part of the adopted detection scheme is a form of adding optical coupling isolation to a signal acquisition circuit (as shown in fig. 1), the acquisition circuit realizes isolation and acquisition in a mode of mutually matching the optical coupling and the acquisition circuit, and more devices enable the space occupancy of the scheme in the implementation process to be larger, when the required number of switching value detection is less, the scheme is a more suitable choice, but actually, taking a national power grid new standard type-III special transformer acquisition terminal as an example, 6 paths of switching value acquisition are needed, and the scheme needs 6 paths of circuits shown in fig. 1, so that the design of a hardware scheme is not convenient, and when the required number of detection is increased, the scheme is seriously insufficient.

The problem that when the terminal switching value is detected in a mode of adding optical coupling isolation to a signal acquisition circuit 2, the structure is complex and the detection of a large number of switching value requirements cannot be met in the prior art is solved; the embodiment provides a terminal switching value detection circuit, which comprises a signal acquisition circuit 2 and an isolation circuit 1, wherein the input side of the signal acquisition circuit 2 is connected with a field switching value device of a power terminal, the output side of the signal acquisition circuit 2 is connected with a processor MCU through the isolation circuit 1, the isolation circuit 1 part comprises an isolation chip 11, the output side of the signal acquisition circuit 2 is connected with the input side of the isolation chip 11 through a second isolation resistor component 13, the output side of the isolation chip 11 is connected with an I/O of the MCU, the MCU is connected with the power terminal, the isolation chip 11 is used for outputting a trigger signal generated by the signal acquisition circuit 2 to the MCU for processing, in the embodiment, the input side of the isolation chip 11 refers to the side where a VDD1 pin is located as shown in FIG. 3, the output side of the isolation chip 11 refers to the side where a VDD2 pin is located as shown in FIG. 3, the input side of the signal acquisition circuit 2 refers to the side where a signal input terminal 23 is located as shown in FIG. 2, the output side of the signal acquisition circuit 2 refers to the side where a signal output terminal 24 is located, and has no other implication.

Through the application scope that the circuit can effectual improvement circuit satisfies the detection demand when terminal switching value demand number is more, simplifies the circuit, reduces the space occupancy of circuit, reduces the cost of circuit, improves the detection efficiency of circuit, and the setting of isolation module can effectually make power terminal avoid the high voltage impact among the trigger signal, and the protection of reinforcing circuit to power terminal makes the circuit more reliable.

The isolation circuit 1 comprises a first isolation resistance component 12, a second isolation resistance component 13, a third isolation resistance component 14 and a fourth isolation resistance component 15, wherein the input end of the first isolation resistance component 12 is connected with an input side power supply 16, the output end of the first isolation resistance component 12 is connected with the input side of an isolation chip 11 through the second isolation resistance component 13, the output side of the isolation chip 11 is connected with the input end of the fourth isolation resistance component 15 through the third isolation resistance component 14, and the output end of the fourth isolation resistance component 15 is connected with an output side power supply 17; the first isolation resistor component 12, the second isolation resistor component 13, the third isolation resistor component 14 and the fourth isolation resistor component 15 all comprise at least one resistor; the resistance value of the first isolation resistance element 12 = the resistance value of the fourth isolation resistance element 15, the resistance value of the second isolation resistance element 13= the resistance value of the third isolation resistance element 14, the isolation chip 11 is NSI8260W1-DSWR, the input side power supply 16 and the output side power supply 17 are two different power supplies, the voltage of the input side power supply 16 is mV, the voltage of the output side power supply 17 is nV, in the present embodiment, m is 5V, and n is 3.3V (as shown in fig. 2), but the values of the actual m and n are not limited thereto.

Through the setting of first isolation resistance subassembly 12, second isolation resistance subassembly 13, third isolation resistance subassembly 14 and fourth isolation resistance subassembly 15, can effectual reinforcing power terminal and 1 security of buffer circuit, the stability of improvement circuit, each isolation resistance subassembly is the resistance setting, can prevent the probably emergence of circuit short circuit to a certain extent, increase the stationarity of circuit simultaneously, isolation chip 11 has effectually replaced the opto-coupler, can effectual simplification circuit, reduce circuit cost, second isolation resistance subassembly 13 and third isolation resistance subassembly 14 are close to isolation chip 11 and set up, certain degree has played the guard action to isolation chip 11, when preventing the pulse signal that circuit output came in for high voltage, cause the probably appearance of damage to other circuits, be favorable to prolonging the life of isolation chip 11, avoid taking place the condition that operating personnel electrocuted, operating personnel safety has been protected.

Wherein, the first isolation resistance component 12 comprises a third resistor R3, a seventh resistor R7, a thirteenth resistor R13, a twenty-first resistor R21, a twenty-fifth resistor R25 and a twenty-ninth resistor R29, the second isolation resistance component 13 comprises a fourth resistor R4, an eighth resistor R8, a fourteenth resistor R14, a twenty-second resistor R22, a twenty-sixth resistor R26 and a thirty-first resistor R30, the third isolation resistance component 14 comprises a fifth resistor R5, a ninth resistor R9, a fifteenth resistor R15, a twenty-third resistor R23, a twenty-seventh resistor R27 and a thirty-first resistor R31, the fourth isolation resistance component 15 comprises a sixth resistor R6, a tenth resistor R10, a sixteenth resistor R16, a twenty-fourth resistor R24, a twenty-eighth resistor R28 and a thirty-second resistor R32, the isolation chip 11 comprises a pin No. 1, a pin No. 2A, a pin No. 3 INB, a pin No. 4 INC, a pin No. 5, a pin No. 7 INE, a pin 7F and VDD, the input terminals of pin No. 8 GND1, pin No. 9 GND2, pin No. 10 OUTF, pin No. 11 OUTE, pin No. 12 OUTD, pin No. 13 OUTC, pin No. 14 OUTB, pin No. 15 OUTA, pin No. 16 VDD2, third resistor R3, seventh resistor R7, thirteenth resistor R13, twenty-first resistor R21, twenty-fifth resistor R25 and twenty-ninth resistor R29 are connected to the input-side power supply 16, the output terminal of the third resistor R3 is connected to pin No. 2 INA through a fourth resistor R4, the output terminal of the seventh resistor R7 is connected to pin No. 3 INB through an eighth resistor R8, the output terminal of the thirteenth resistor R13 is connected to pin No. 4 INC through a fourteenth resistor R14, the output terminal of the twenty-first resistor R21 is connected to pin No. 5 IND through a twelfth resistor R22, the output terminal of the twenty-fifth resistor R25 is connected to pin No. 6 INE through a twenty-sixth resistor R26, the output terminal of the twenty-ninth resistor R29 is connected to pin No. 7 INF 30, pin number 10, OUTF, is connected to the input terminal of thirty-second resistor R32 through a thirty-first resistor R31, pin number 11, OUTE, is connected to the input terminal of twenty-eighth resistor R28 through a twenty-seventh resistor R27, pin number 12, OUTD, is connected to the input terminal of twenty-fourth resistor R24 through a twenty-thirteenth resistor R23, pin number 13, OUTC, is connected to the input terminal of sixteenth resistor R16 through a fifteenth resistor R15, pin number 14, OUTB, is connected to the input terminal of tenth resistor R10 through a ninth resistor R9, pin number 15, OUTA, is connected to the input terminal of sixth resistor R6 through a fifth resistor R5, and the output terminals of sixth resistor R6, tenth resistor R10, sixteenth resistor R16, twenty-fourth resistor R24, twenty-eighth resistor R28, and thirty-second resistor R32 are all connected to output-side power supply 17; pin GND2 No. 9 is connected to output-side ground GND _ SYS and an output end of a fourth capacitor C4, respectively, and an input end of a fourth capacitor C4 is connected to pin VDD2 No. 16 and an output-side power supply 17 (as shown in fig. 3), respectively, in this embodiment, R3= R7= R13= R21= R25= R29= R6= R10= R16= R24= R28= R32=4.7K Ω 1%, R4= R5= R14= R22= R26= R30= R5= R9= R15= R23= R27= R31=100 Ω 1%, and C1= C4=0.1 μ F16V, where H denotes a resistance number and a size corresponding to an input-side resistor of the isolation chip 11, and L denotes a resistance number and a size corresponding to an output-side resistor of the isolation chip 11, respectively, but the present invention is not limited thereto.

Carry out effectual protection to other circuits that the treater is connected through the interact of individual resistance, the switching value signal that prevents to gather has the appearance of high voltage, and then irritate in other circuits that MCU connects, can effectual increase circuit's security, double-circuit power supply sets up the both sides at isolation chip 11, be favorable to improving switching value signal and power terminal's electrical isolation, avoid forceful electric power signal to get into power terminal, strengthen circuit's reliability and security, and 1 input side of isolation circuit and output side use different mains operated, and GND signal also do not link to each other, further play the effect of isolation.

The signal acquisition circuit 2 comprises a first resistor R1, an eleventh resistor R11, a twentieth resistor R20, a seventeenth resistor R17, a third capacitor C3, a fifth capacitor C5, a seventh capacitor C7, a first triode V1, a second triode V3 and a diode VDa, wherein the cathode of the diode VDa is connected with the field switching value device through a signal input terminal 23, the anode of the diode VDa is respectively connected with the input end of the first resistor R1, the input end of the eleventh resistor R11 and the input end of the third capacitor C3, the output end of the third capacitor C3 is respectively connected with the output end of the first resistor R1, the power supply 21 of the sampling module and the emitter of the first triode V1, the output end of the eleventh resistor R11 is connected with the base of the first triode V1, the collector of the first triode V1 is respectively connected with the input end of the seventeenth resistor R17 and the input end of the twentieth resistor R20, the output end of the seventeenth resistor R17 is respectively connected with the input end of the seventh capacitor C7 and the base of the second triode V3, the output end of a twentieth resistor R20 is connected with the output end of a seventh capacitor C7, the emitter of the second triode V3, the sampling ground 22 and the output end of a fifth capacitor C5, the collector of the second triode V3 is connected with the input end of the fifth capacitor C5 and the input side of a signal output terminal 24, and the output side of the signal output terminal 24 is arranged between the first isolation resistor component 12 and the second isolation resistor component 13, wherein at least one signal acquisition circuit 2 is provided, the resistance value of the first resistor R1= the resistance value of the eleventh resistor R11= the resistance value of the seventeenth resistor R17= the resistance value of the twentieth resistor R20, the capacitance value of the third capacitor C3= the capacitance value of the fifth capacitor C5= the capacitance value of the seventh capacitor C7, the model of the first triode V1 is 2SB1198, the diode VDa is MMF36A, the second triode V3 is MMBT3904, in the embodiment, a is a natural number, and a ranges from 1 to 6, r1= R11= R17= R20=10K Ω 1%, C3= C5= C7=10nF50V, and the sampling module power supply 21 is 12V, but is not limited thereto actually.

Through the cooperation use of each part of signal acquisition circuit 2, the effectual use that reduces device in the signal acquisition circuit 2 makes circuit structure simpler, has strengthened the practicality of circuit, has avoided the use of opto-coupler, has reduced consumeing of the cost of circuit, has increaseed the reliability of circuit, makes the operation that the circuit can be more stable and carry out effectual collection and detection to on-the-spot switching value signal.

The working principle of the signal acquisition circuit 2 is as follows:

when an external field switching value signal INa triggers the signal acquisition circuit 2 through the signal input terminal 23, the diode VDa is conducted, so that the base voltage of the first triode V1 is pulled down, the first triode V1 is conducted to work, the voltage at the two ends of the twentieth resistor R20 is driven to rise, the second triode V3 is conducted, a triggering signal INa _1 is generated and output to the position between the first isolation resistor component 12 and the second isolation resistor component 13 of the isolation circuit 1 through the signal output terminal 24, wherein INa _1 is a low level; IN this embodiment, since the isolation chip 11 used is NSI8260W1-DSWR, an input side of the isolation chip 11 includes 8 pins, wherein a pin VDD1 is connected to the input side power supply 16 and the input end of the first capacitor C1, and an output end of the first capacitor C1 is connected to a pin GND1 of the isolation chip 11 and the first isolation ground GND, respectively, so that pins two to seven are connected to the signal acquisition circuit 2, and the signal acquisition circuit 2 needs 6 pins, specifically, when a =1, the field switching value signal IN1 generates the trigger signal IN1_1 through the signal acquisition circuit 2, and the trigger signal IN1_1 sequentially passes through the signal output terminal 24 and the fourth resistor R4 of the second isolation resistor assembly 13 and is connected to the pin 2 of the isolation chip 11, and the diode is VD1 at this time; when a =2, the field switching value signal IN2 generates a trigger signal IN2_1 through the signal acquisition circuit 2, and the trigger signal IN2_1 is connected with the pin 3 of the isolation chip 11 through the signal output terminal 24 and the eighth resistor R8 of the second isolation resistor assembly 13 IN sequence, and the diode is VD2 at this time; when a =3, the field switching value signal IN3 generates a trigger signal IN3_1 through the signal acquisition circuit 2, and the trigger signal IN3_1 sequentially passes through the signal output terminal 24 and the fourteenth resistor R14 of the second isolation resistor assembly 13 to be connected with the pin 4 of the isolation chip 11, and the diode is VD3 at this time; when a =4, the field switching value signal IN4 generates a trigger signal IN4_1 through the signal acquisition circuit 2, and the trigger signal IN4_1 is connected with the pin No. 5 of the isolation chip 11 through the signal output terminal 24 and the twenty-second resistor R22 of the second isolation resistor assembly 13 IN sequence, and the diode is VD4 at this time; when a =5, the field switching value signal IN5 generates a trigger signal IN5_1 through the signal acquisition circuit 2, and the trigger signal IN5_1 is connected with the pin 6 of the isolation chip 11 through the signal output terminal 24 and the twenty-sixth resistor R26 of the second isolation resistor assembly 13 IN sequence, and the diode is VD5 at this time; when a =6, the field switching value signal IN6 generates a trigger signal IN6_1 through the signal acquisition circuit 2, and the trigger signal IN6_1 is connected with the pin No. 7 of the isolation chip 11 through the signal output terminal 24 and the thirtieth resistor R30 of the second isolation resistor assembly 13 IN sequence, and the diode is VD6 at this time; but is not limited thereto.

Through this signal acquisition circuit 2, diode VDa can prevent the reverse voltage of on-the-spot switching value device from pouring into the circuit, the effectual signal acquisition circuit 2 that has protected, make signal acquisition circuit 2 avoid the influence of reversal, in addition, in theory when external trigger signal produced, INa voltage should be 0V, but power terminal on-the-spot switching value signal is complicated, INa signal level probably can not reach 0V, can be the virtual high 2V-3V, under this kind of condition, diode VDa still can switch on, signal acquisition circuit 2 can normally gather terminal switching value signal, therefore signal acquisition circuit 2 has further improved the reliability and the security of circuit.

The isolation circuit 1 mainly comprises an isolation chip 11, trigger signals IN1_1-IN6_1 generated by a signal acquisition circuit 2 are connected to the input side of the isolation chip 11, output signals OUT1-OUT6 are generated on the output side of the corresponding isolation chip 11, and the output signals are connected to an I/O port of an MCU for processing, specifically, IN1_1 is arranged between a third resistor R3 and a fourth resistor R4, IN2_1 is arranged between R7 and R8, IN3_1 is arranged between R13 and R14, IN4_1 is arranged between R21 and R22, IN5_1 is arranged between R25 and R26, IN6_1 is arranged between R29 and R30, OUT1 is arranged between R5 and R6, OUT2 is arranged between R9 and R10, OUT3 is arranged between R15 and R16, OUT4 is arranged between R23 and R24, OUT5 is arranged between R27 and R28, and OUT6 is arranged between R31 and R32.

Through the use of multichannel isolation chip 11, can be effectual keep apart the back with the signal of switching value signal acquisition circuit 2 output, be connected to processor MCU and handle, the demand that power terminal gathered the on-the-spot switching value has been satisfied, through the optimal design, make the circuit structure simpler, can be under the condition that uses less device, reduce the cost of circuit, and the safe and reliable of circuit structure has been guaranteed, and have great popularization nature, more because the shared space of this circuit is little, the design of hardware has been made things convenient for, make the detection security high, prevent that the on-the-spot connects the voltage that active switching value arouses to irritate conversely, thereby damage other circuits, and even under the condition that external switching value trigger signal has the float, the treater also can accurately detect the signal, make the detection reliability higher.

The utility model discloses in, to arbitrary switching value circuit, can include in this embodiment a terminal switching value detection circuitry structure, and on the basis of the signal acquisition circuit 2 that this embodiment provided, isolation circuit 1's correlation structure and assembled relation, the switching value circuit still includes the conventional component including structures such as CPU, comparator, in view of it is prior art, does not give unnecessary details here.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a terminal switching value detection circuitry, a serial communication port, including signal acquisition circuit (2) and buffer circuit (1), signal acquisition circuit (2) input side is connected with on-the-spot switching value device, signal acquisition circuit (2) output side passes through buffer circuit (1) and is connected with treater MCU, buffer circuit (1) part is including isolation chip (11), signal acquisition circuit (2) output side passes through second isolation resistance subassembly (13) and is connected with the input side of isolation chip (11), the output side of isolation chip (11) is connected with MCU's IO, MCU is connected with power terminal, MCU isolation chip (11) are used for exporting the MCU processing with the trigger signal that signal acquisition circuit (2) produced.

2. A terminal switching value detection circuit according to claim 1, wherein the isolation circuit (1) comprises a first isolation resistor component (12), a second isolation resistor component (13), a third isolation resistor component (14) and a fourth isolation resistor component (15), an input end of the first isolation resistor component (12) is connected to the input side power supply (16), an output end of the first isolation resistor component (12) is connected to the input side of the isolation chip (11) through the second isolation resistor component (13), an output side of the isolation chip (11) is connected to an input end of the fourth isolation resistor component (15) through the third isolation resistor component (14), and an output end of the fourth isolation resistor component (15) is connected to the output side power supply (17).

3. A terminal switching value detection circuit according to claim 2, characterized in that the first isolation resistor component (12), the second isolation resistor component (13), the third isolation resistor component (14) and the fourth isolation resistor component (15) each comprise at least one resistor.

4. A terminal switching value detecting circuit as claimed in claim 2, wherein the isolating chip (11) is NSI8260W1-DSWR.

5. A terminal switching value detecting circuit according to claim 2, wherein the input side power supply (16) and the output side power supply (17) are two-way power supplies, the voltage of the input side power supply (16) is mV, and the voltage of the output side power supply (17) is nV.

6. A termination switch quantity detection circuit according to claim 3, characterized in that said signal acquisition circuit (2) comprises a first resistor R1, an eleventh resistor R11, a twentieth resistor R20, a seventeenth resistor R17, a third capacitor C3, a fifth capacitor C5, a seventh capacitor C7, a first transistor V1, a second transistor V3 and a diode VDa, the cathode of the diode VDa is connected to the field switch quantity device via a signal input terminal (23), the anode of the diode VDa is connected to the input of the first resistor R1, the input of the eleventh resistor R11 and the input of the third capacitor C3, the output of the third capacitor C3 is connected to the output of the first resistor R1, the power supply (21) of the sampling module and the emitter of the first transistor V1, the output of the eleventh resistor R11 is connected to the base of the first transistor V1, the collector of the first transistor V1 is connected to the input of the seventeenth resistor R17 and the input of the twentieth resistor R20, the output of the seventeenth resistor R17 is connected to the seventh capacitor C7, the output of the seventh resistor V3, the second resistor V3 is connected to the input of the sampling module, the signal output terminal (24) and the emitter of the second transistor V5), and the isolation component are connected to the signal output terminal of the signal output terminal (24).

7. A terminal switching value detection circuit as claimed in claim 6, characterized in that at least one of said signal acquisition circuits (2) is provided.

8. A terminal switching value detecting circuit as claimed in claim 6, wherein the first resistor R1 is resistive = eleventh resistor R11 is resistive = seventeenth resistor R17 is resistive = twentieth resistor R20, and the third capacitor C3 is capacitive = fifth capacitor C5 is capacitive = seventh capacitor C7.

9. A termination switching value detection circuit as claimed in claim 3, characterised in that the resistance value of the first isolation resistor element (12) = the resistance value of the fourth isolation resistor element (15) and the resistance value of the second isolation resistor element (13) = the resistance value of the third isolation resistor element (14).

10. A terminal switching value detecting circuit as claimed in claim 7, wherein the first transistor V1 is 2SB1198, and the second transistor V3 is MMBT3904.