CN104062035B - The governor circuit of calorimeter - Google Patents
The governor circuit of calorimeter Download PDFInfo
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- CN104062035B CN104062035B CN201410246842.5A CN201410246842A CN104062035B CN 104062035 B CN104062035 B CN 104062035B CN 201410246842 A CN201410246842 A CN 201410246842A CN 104062035 B CN104062035 B CN 104062035B
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Abstract
The present invention provides the governor circuit of a kind of calorimeter, including single-chip microcomputer, power module, infrared communication module, MBUS communication module and 485 communication modules, Single-chip Controlling infrared communication module carries out calibration, and single-chip microcomputer is communicated with host computer by MBUS communication module, 485 communication modules；75 human hair combing wastes of single-chip microcomputer send data signal to resistance R13 driven for emitting lights diode T1 in infrared communication module, send data to host computer；77 feet of single-chip microcomputer are opened infrared receiving tube D3, infrared receiving tube D3 and are started to receive data, and data are introduced to single-chip microcomputer by 76 feet of single-chip microcomputer；Single-chip microcomputer 78 foot sends data to the anode of optocoupler U5 in MBUS communication module, light coupling signal is converted into voltage signal transmission and to the RXI port of chip U4 and is become the MBUS signal of standard by internal conversion, exported to terminal J3 by two-port, by curent change, signal is sent 79 feet to single-chip microcomputer from TX signal by optocoupler U6 simultaneously；The whole circuit structure of the present invention is simple, low cost, low-power consumption and function reliable.
Description
Technical field
The present invention relates to a kind of governor circuit, be specifically related to the governor circuit of a kind of calorimeter, belong to thermal measurement
Technical field.
Background technology
Ultrasonic calorimeter passes with following current with ultrasound wave propagation time in counter-flow water according to ultrasound wave flow rate of water flow
Broadcast a kind of heat metering utensil that the proportional principle of time difference is designed and manufactures.Utilize ultrasound wave
Technology is accurately measured and shows that water flows through heat-exchange system and discharged or absorb heat energy, thus provides flow, temperature
Degree, the temperature difference, the accurate measurement of heat and display.
The problem that the governor circuit of calorimeter presently, there are at present:
(1) circuit that analog device is built, anti-interference is poor, measures instability.
(2) ultrasound wave voltage magnitude after transmission is the least, and the appearance of only 2-300mv is the most disturbed.
(3) precision measuring time difference is very poor, causes flow measurement precision not high enough.
(4), after wave-shaping circuit plate, comparison of coherence is poor.
Summary of the invention
The problem existed for prior art, the invention provides the governor circuit of a kind of calorimeter.
The governor circuit of a kind of calorimeter, this governor circuit includes single-chip microcomputer, power module, infrared communication mould
Block, MBUS communication module and 485 communication modules, power module provides power supply, Single-chip Controlling infrared communication
Module carries out calibration, and single-chip microcomputer is communicated with host computer by MBUS communication module, 485 communication modules；
Described power module include power supply chip P1, voltage stabilizing chip P3, filter capacitor C1, filter capacitor C3,
Electrolytic capacitor filter C23 and terminal X1, wherein the model of power supply chip P1 is XC6201P332PR, voltage stabilizing
The model of chip P3 is R3111H301C；The pin 1 of power supply chip P1 is connected with power supply VCC, passes through
Filter capacitor C1 is connected to ground；The pin 2 of power supply chip P1 is connected to ground；The pin 3 of power supply chip P1
Connecting the pin 2 of voltage stabilizing chip P3, the positive pole of one end of filter capacitor C3 and electrolysis filter capacitor C23 is even
Connect pin 3 and the pin 2 of voltage stabilizing chip P3, the other end of filter capacitor C3 and the electrolysis of power supply chip P1
The negative pole of filter capacitor C23 is connected to the ground, and the pin 2 of voltage stabilizing chip P3 is connected with 1 foot of terminal X1；
The pin 1 of voltage stabilizing chip P3 is connected with single-chip microcomputer 70 foot；The pin 3 of voltage stabilizing chip P3 and the 2 of terminal X1
Foot is connected to the ground；
Described infrared communication module includes infrared transmitting circuit and infrared receiving circuit, wherein infrared transmitting circuit
Including audion T1, current-limiting resistance R13, divider resistance R12 and light emitting diode D2, power supply VCC is even
Connecing the emitter stage of audion T1, the base stage of audion T1 is connected to single-chip microcomputer 75 foot by current-limiting resistance R13,
The colelctor electrode of audion T1 is connected on the positive pole of light emitting diode D2, light emitting diode by divider resistance R12
The negative pole of D2 is connected to ground；Infrared receiving circuit includes resistance R11, resistance R14 and infrared receiving tube D3,
Power supply VCC is divided into two-way by after resistance R14,76 feet of a road connection resistance R11 to single-chip microcomputer, and one
Road connects the positive pole of infrared receiving tube D3, and the negative pole of infrared receiving tube D3 is connected to 77 feet of single-chip microcomputer.
Described MBUS communication module include chip U4, terminal J3, resistance R9, resistance R36, resistance R35,
Resistance R37, resistance R38, resistance R39, resistance R40, resistance R41, resistance R42, resistance R43, double
To killer tube, electric capacity C12, electric capacity C13, filter capacitor C22, optocoupler U5 and optocoupler U6, chip U4
Model be TSS721；
1 foot of terminal J3 is connected to the pin 16 of chip U4 by resistance R36, and 2 feet of terminal J3 pass through
Resistance R35 is connected to the pin 1 of chip U4, is connected two-way killer tube, chip between pin 1 with pin 16
The pin 3 of U4 divides two-way after drawing, and filter capacitor C22 of leading up to is connected to the ground, and a road connects optocoupler
The anode of light emitting diode in U6, in optocoupler U6, the negative terminal of light emitting diode is connected to core by resistance R40
The pin 8 of sheet U4, the pin 4 of chip U4 is connected to the ground by resistance R37, the pin 15 of chip U4
Being connected to the ground, the pin 6 of chip U4 is connected to the ground by electric capacity C12, and the pin 14 of chip U4 is by electricity
Resistance R9 is connected to the ground, and the pin 13 of chip U4 divides two-way after drawing, and resistance R39 of leading up to is connected to the ground,
One tunnel is connected to the emitter stage of audion in optocoupler U5, and in optocoupler U5, the colelctor electrode of audion is connected to chip
11 feet of U4,11 feet of chip U4 and 9 feet divide two-way after being connected, and resistance R38 of leading up to is connected to
Ground, electric capacity C13 of leading up to is connected to the ground；In optocoupler U5, the positive pole of light emitting diode connects resistance R41
Rear connection positive source, in optocoupler U5, the negative pole of light emitting diode is connected to 78 feet of single-chip microcomputer, optocoupler U6
The colelctor electrode of middle audion is divided into two-way after connecting extraction, and a road connects positive source, and another road connects resistance
Being connected to 79 feet of single-chip microcomputer after R43, in optocoupler U6, the emitter stage of audion is connected to the ground.
Described 485 communication modules include chip U1, power supply chip P2, terminal J2, terminal J4, resistance R1,
Resistance R2, resistance R3, resistance R4, resistance R8, resistance R19, resistance R20, filter capacitor C5 and guarantor
Protecting diode D1, the model of its chips U1 is MAX485, and the model of power supply chip P2 is
XC6201P502PR；
2 feet of terminal J2 are connected to the ground, and 3 feet of terminal J2 are connected to 80 feet of single-chip microcomputer, terminal J2's
4 feet are connected to 78 feet of single-chip microcomputer, and 5 feet of terminal J2 are connected to 79 feet of single-chip microcomputer, the 78 of single-chip microcomputer
Foot is connected to the pin 4 of chip U1 also by resistance R1, and the pin 3 of chip U1 is divided into two-way after drawing,
One tunnel is connected to 80 feet of single-chip microcomputer, and resistance R20 of separately leading up to is connected to the ground, and pin 3 is with pin 2 even
Connecing, the pin 1 of chip U1 is divided into two-way after connecting resistance R2, and a road is connected to 79 feet of single-chip microcomputer, separately
One tunnel connects ground connection after resistance R19, and the pin 8 of chip U1 is divided into two-way after drawing, and leads up to filtered electrical
Holding C5 to be connected to the ground, a road is connected to the pin 1 of power supply chip P2, and the pin 7 of chip U1 passes through resistance
R4 is connected to 6 feet of terminal J4, and the pin 6 of chip U1 is connected to 5 feet of terminal J4 by resistance R3,
Connecting with resistance R8 between 5 feet and 6 feet of terminal J4, the pin 5 of chip U1 is divided into two-way after drawing,
One tunnel is connected to the pin 2 of power supply chip P2, and another road is connected to the ground with 4 feet of terminal J4；Terminal J4
Connecting the positive pole of protection diode D1, the negative pole of protection diode D1 is connected to the pin 3 of power supply chip P2.
Beneficial effect:
(1) present invention carries out calibration by controlling infrared communication module, and by MBUS communication module, 485
Communication module communicates with host computer, and infrared communication module can realize closely low rate communication, power supply electricity
Road uses multi-capacity coupled way, reduces and disturbs, thus stabilized supply voltage so that supply current exports
More stable, whole circuit structure is simple, low cost, low-power consumption and function reliable.
(2) MBUS communication module and 485 communication modules of the present invention all use integrated chip, simple in construction
And its integrated level can be made to improve, disturb minimizing and stability strong；MBUS communication module uses the symplectic whole electricity of light
Road carries out voltage isolation, owing to the voltage ratio of whole governor circuit own is higher, is changed by the signal of telecommunication by optocoupler
Become optical signal to be then converted into voltage signal, voltage is isolated and do not interfered with the voltage of governor circuit.
Accompanying drawing explanation
Fig. 1 is the ingredient figure of governor circuit of the present invention.
Fig. 2 is the schematic diagram of single-chip microcomputer of the present invention.
Fig. 3 is the schematic diagram of power module of the present invention.
Fig. 4 is the schematic diagram of MBUS communication module of the present invention.
Fig. 5 is the schematic diagram of infrared communication module of the present invention.
Fig. 6 is the schematic diagram of the present invention 485 communication module.
Detailed description of the invention
Develop simultaneously embodiment below in conjunction with the accompanying drawings, describes the present invention.
As shown in Figure 1, the invention provides the governor circuit of a kind of calorimeter, this governor circuit includes list
The mechanical, electrical source module of sheet, infrared communication module, MBUS communication module, 485 communication modules, power module carries
Power supply source；Single-chip Controlling infrared communication module carries out calibration, single-chip microcomputer by MBUS communication module, 485
Communication module communicates with host computer；
As shown in Figure 3, power module includes power supply chip P1 (model is XC6201P332PR), voltage stabilizing
Chip P3 (model is R3111H301C), filter capacitor C1, filter capacitor C3, electrolytic capacitor filter C23
With terminal X1；
Annexation: the Out end (pin 1) of power supply chip XC6201P332PR is connected with power supply VCC,
It is connected to ground by filter capacitor C1；The Vss end (pin 2) of power supply chip XC6201P332PR connects
To ground；The Vin end (pin 3) of power supply chip XC6201P332PR connects voltage stabilizing chip R3111H301C
VIN end (pin 2), one end of filter capacitor C3 and electrolysis filter capacitor C23 positive pole connect power supply
The pin 3 of chip P1 and the pin 2 of voltage stabilizing chip P3, the other end of filter capacitor C3 and electrolysis filtered electrical
The negative pole holding C23 is connected to the ground, the Vin end (pin 2) of voltage stabilizing chip R3111H301C and terminal X1
1 foot connect；The OUT terminal (pin 1) of voltage stabilizing chip R3111H301C is connected with single-chip microcomputer 70 foot；
The GND end of voltage stabilizing chip R3111H301C is connected to the ground with 2 feet of terminal X1.
As shown in Figure 5, infrared communication module includes infrared transmitting circuit and infrared receiving circuit, infrared
Radio road includes audion T1, current-limiting resistance R13, divider resistance R12 and light emitting diode D2；Infrared connect
Receive circuit and include resistance R11, resistance R14 and infrared receiving tube D3.
Infrared transmitting circuit annexation: the emitter stage of power supply VCC connecting triode T1, audion T1's
Base stage is connected to single-chip microcomputer 75 foot by current-limiting resistance R13, and the colelctor electrode of audion T1 passes through divider resistance
R12 is connected on the positive pole of light emitting diode D2, and the negative pole of light emitting diode D2 is connected to ground.
Infrared receiving circuit annexation: power supply VCC is divided into two-way by after resistance R14, a road connects electricity
Resistance R11 connects the positive pole of infrared receiving tube D3 to 76 feet of single-chip microcomputer, a road, infrared receiving tube D3's
Negative pole is connected to 77 feet of single-chip microcomputer.
As shown in Figure 4, MBUS communication module include chip U4, terminal J3, resistance R9, resistance R36,
Resistance R35, resistance R37, resistance R38, resistance R39, resistance R40, resistance R41, resistance R42, electricity
Resistance R43, two-way killer tube, electric capacity C12, electric capacity C13, filter capacitor C22, optocoupler U5, optocoupler U6.
Annexation: 1 foot of the terminal J3 of MBUS circuit board is connected to MBUS chip by resistance R36
The BUSL2 foot (pin 16) of U4 (TSS721), 2 feet of terminal J3 are connected to TSS721 by resistance R35
BUSL1 foot (pin 1), be connected two-way killer tube between BUSL1 foot with BUSL2 foot, TSS721's
STC foot (pin 3) divides two-way after drawing, and filter capacitor C22 of leading up to is connected to the ground, and a road connects light
The anode of light emitting diode in coupling U6, in optocoupler U6, the negative terminal of light emitting diode is connected to by resistance R40
The TX foot (pin 8) of TSS721, the RIDD foot (pin 4) of TSS721 is connected to by resistance R37
Ground, the GND end of TSS721 is connected to the ground, and the SC foot (pin 6) of TSS721 is connected by electric capacity C12
To ground, the RIS foot (pin 14) of TSS721 is connected to the ground by resistance R9, the RXI foot (pipe of TSS721
Foot 13) draw after point two-way, resistance R39 of leading up to is connected to the ground, and a road is connected in optocoupler U5 three
The emitter stage of pole pipe, in optocoupler U5, the colelctor electrode of audion is connected to 11 feet of TSS721, TSS721's
11 feet and 9 feet divide two-way after being connected, and resistance R38 of leading up to is connected to the ground, and electric capacity C13 of leading up to is even
It is connected to ground.VCC divides two-way, and a road connects the positive pole of light emitting diode in optocoupler U5 after connecting resistance R41,
In optocoupler U5, the negative pole of light emitting diode is connected to 78 feet of single-chip microcomputer, and another road is divided after connecting resistance R42
For two-way, a road is connected to 79 feet of single-chip microcomputer after connecting resistance R43, a road connects three poles in optocoupler U6
The colelctor electrode of pipe, in optocoupler U6, the emitter stage of audion is connected to the ground.
As shown in Figure 6,485 communication modules include chip U1, power supply chip P2, terminal J2, terminal J4,
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R8, resistance R19, resistance R20, filtered electrical
Hold C5 and protection diode D1.
Annexation: 2 feet of terminal J2 are connected to the ground, 3 feet of terminal J2 are connected to 80 feet of single-chip microcomputer,
4 feet of terminal J2 are connected to 78 feet of single-chip microcomputer, and 5 feet of terminal J2 are connected to 79 feet of single-chip microcomputer, single
78 feet of sheet machine are connected to the D end of chip U1 (MAX485) (pin 4), single-chip microcomputer by resistance R1
80 feet be divided into two-way, a road is connected to the DE end (3 foot) of MAX485 chip, RE end and DE end
Connecting, resistance R20 of separately leading up to is connected to the ground, and 79 feet of single-chip microcomputer divide two-way, leads up to resistance R19
Being connected to the ground, resistance R2 of leading up to is connected to the R end of MAX485 chip, the VCC of MAX485 chip
Being divided into two-way, filter capacitor C5 of leading up to is connected to the ground, and a road is connected to power supply chip P2
(XC6201P502PR) the B end of OUT, MAX485 chip is connected to terminal J4's by resistance R4
6 feet, the A end of MAX485 chip is connected to 5 feet of terminal J4 by resistance R3,5 feet of terminal J4 and
Connecting with resistance R8 between 6 feet, the terminal GND of MAX485 is divided into two-way, and a road is connected to power supply core
The VSS end of sheet P2 (XC6201P502PR), a road is connected to the ground with 4 feet of terminal J4.J3 terminal is even
Connecing the positive pole of protection diode D1, the negative pole of protection diode D1 is connected to power supply chip P2
(XC6201P502PR) Vin end.
Work process:
In power module, X1 terminal connects power supply, through voltage stabilizing chip P1 (XC6201P332PR) output electricity
Source VCC, VCC are connected to single-chip microcomputer 59 foot, it is provided that power to single-chip microcomputer and peripheral circuit.
75 human hair combing wastes of single-chip microcomputer send data signal to resistance R13 driven for emitting lights diode in infrared communication module
T1, sends data to host computer.77 feet of single-chip microcomputer are opened infrared receiving tube D3, infrared receiving tube D3 and are opened
Beginning to receive data, data are introduced to single-chip microcomputer by 76 feet of single-chip microcomputer.
Single-chip microcomputer 78 foot sends data to the anode of optocoupler U5 in MBUS communication module, and light coupling signal is changed
Becoming voltage signal transmission to the RXI port of chip U4 (TSS721), TSS721 becomes standard by internal conversion
MBUS signal, exported to terminal J3 by BUSL1 and BUSL2 port.Chip U4 (TSS721) simultaneously
BUSL1 and BUSL2 port by curent change by signal from the TX signal of TSS721 by optocoupler U6
Send 79 feet to single-chip microcomputer.
In sum, these are only presently preferred embodiments of the present invention, be not intended to limit the guarantor of the present invention
Protect scope.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made,
Should be included within the scope of the present invention.
Claims (3)
1. the governor circuit of a calorimeter, it is characterised in that this governor circuit includes single-chip microcomputer, power supply mould
Block, infrared communication module, MBUS communication module and 485 communication modules, power module provides power supply, monolithic
Machine controls infrared communication module and carries out calibration, and single-chip microcomputer passes through MBUS communication module, 485 communication modules with upper
Position machine communicates；
Described power module include power supply chip P1, voltage stabilizing chip P3, filter capacitor C1, filter capacitor C3,
Electrolytic capacitor filter C23 and terminal X1, wherein the model of power supply chip P1 is XC6201P332PR, voltage stabilizing
The model of chip P3 is R3111H301C；The pin 1 of power supply chip P1 is connected with power supply VCC, passes through
Filter capacitor C1 is connected to ground；The pin 2 of power supply chip P1 is connected to ground；The pin 3 of power supply chip P1
Connecting the pin 2 of voltage stabilizing chip P3, the positive pole of one end of filter capacitor C3 and electrolysis filter capacitor C23 is even
Connect pin 3 and the pin 2 of voltage stabilizing chip P3, the other end of filter capacitor C3 and the electrolysis of power supply chip P1
The negative pole of filter capacitor C23 is connected to the ground, and the pin 2 of voltage stabilizing chip P3 is connected with 1 foot of terminal X1；
The pin 1 of voltage stabilizing chip P3 is connected with single-chip microcomputer 70 foot；The pin 3 of voltage stabilizing chip P3 and the 2 of terminal X1
Foot is connected to the ground；
Described infrared communication module includes infrared transmitting circuit and infrared receiving circuit, wherein infrared transmitting circuit
Including audion T1, current-limiting resistance R13, divider resistance R12 and light emitting diode D2, power supply VCC is even
Connecing the emitter stage of audion T1, the base stage of audion T1 is connected to single-chip microcomputer 75 foot by current-limiting resistance R13,
The colelctor electrode of audion T1 is connected on the positive pole of light emitting diode D2, light emitting diode by divider resistance R12
The negative pole of D2 is connected to ground；Infrared receiving circuit includes resistance R11, resistance R14 and infrared receiving tube D3,
Power supply VCC is divided into two-way by after resistance R14,76 feet of a road connection resistance R11 to single-chip microcomputer, and one
Road connects the positive pole of infrared receiving tube D3, and the negative pole of infrared receiving tube D3 is connected to 77 feet of single-chip microcomputer.
2. the governor circuit of calorimeter as claimed in claim 1, it is characterised in that described MBUS communication
Module include chip U4, terminal J3, resistance R9, resistance R36, resistance R35, resistance R37, resistance R38,
Resistance R39, resistance R40, resistance R41, resistance R42, resistance R43, two-way killer tube, electric capacity C12,
Electric capacity C13, filter capacitor C22, optocoupler U5 and optocoupler U6, the model of chip U4 is TSS721；
1 foot of terminal J3 is connected to the pin 16 of chip U4 by resistance R36, and 2 feet of terminal J3 pass through
Resistance R35 is connected to the pin 1 of chip U4, is connected two-way killer tube, chip between pin 1 with pin 16
The pin 3 of U4 divides two-way after drawing, and filter capacitor C22 of leading up to is connected to the ground, and a road connects optocoupler
The anode of light emitting diode in U6, in optocoupler U6, the negative terminal of light emitting diode is connected to core by resistance R40
The pin 8 of sheet U4, the pin 4 of chip U4 is connected to the ground by resistance R37, the pin 15 of chip U4
Being connected to the ground, the pin 6 of chip U4 is connected to the ground by electric capacity C12, and the pin 14 of chip U4 is by electricity
Resistance R9 is connected to the ground, and the pin 13 of chip U4 divides two-way after drawing, and resistance R39 of leading up to is connected to the ground,
One tunnel is connected to the emitter stage of audion in optocoupler U5, and in optocoupler U5, the colelctor electrode of audion is connected to chip
11 feet of U4,11 feet of chip U4 and 9 feet divide two-way after being connected, and resistance R38 of leading up to is connected to
Ground, electric capacity C13 of leading up to is connected to the ground；In optocoupler U5, the positive pole of light emitting diode connects resistance R41
Rear connection positive source, in optocoupler U5, the negative pole of light emitting diode is connected to 78 feet of single-chip microcomputer, optocoupler U6
The colelctor electrode of middle audion is divided into two-way after connecting extraction, and a road connects positive source, and another road connects resistance
Being connected to 79 feet of single-chip microcomputer after R43, in optocoupler U6, the emitter stage of audion is connected to the ground.
3. the governor circuit of calorimeter as claimed in claim 1, it is characterised in that described 485 communication moulds
Block include chip U1, power supply chip P2, terminal J2, terminal J4, resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R8, resistance R19, resistance R20, filter capacitor C5 and protection diode D1, wherein
The model of chip U1 is MAX485, and the model of power supply chip P2 is XC6201P502PR；
2 feet of terminal J2 are connected to the ground, and 3 feet of terminal J2 are connected to 80 feet of single-chip microcomputer, terminal J2's
4 feet are connected to 78 feet of single-chip microcomputer, and 5 feet of terminal J2 are connected to 79 feet of single-chip microcomputer, the 78 of single-chip microcomputer
Foot is connected to the pin 4 of chip U1 also by resistance R1, and the pin 3 of chip U1 is divided into two-way after drawing,
One tunnel is connected to 80 feet of single-chip microcomputer, and resistance R20 of separately leading up to is connected to the ground, and pin 3 is with pin 2 even
Connecing, the pin 1 of chip U1 is divided into two-way after connecting resistance R2, and a road is connected to 79 feet of single-chip microcomputer, separately
One tunnel connects ground connection after resistance R19, and the pin 8 of chip U1 is divided into two-way after drawing, and leads up to filtered electrical
Holding C5 to be connected to the ground, a road is connected to the pin 1 of power supply chip P2, and the pin 7 of chip U1 passes through resistance
R4 is connected to 6 feet of terminal J4, and the pin 6 of chip U1 is connected to 5 feet of terminal J4 by resistance R3,
Connecting with resistance R8 between 5 feet and 6 feet of terminal J4, the pin 5 of chip U1 is divided into two-way after drawing,
One tunnel is connected to the pin 2 of power supply chip P2, and another road is connected to the ground with 4 feet of terminal J4；Terminal J4
Connecting the positive pole of protection diode D1, the negative pole of protection diode D1 is connected to the pin 3 of power supply chip P2.
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| CN201410246842.5A CN104062035B (en) | 2014-06-05 | 2014-06-05 | The governor circuit of calorimeter |
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| CN201410246842.5A CN104062035B (en) | 2014-06-05 | 2014-06-05 | The governor circuit of calorimeter |
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| CN104062035B true CN104062035B (en) | 2016-08-24 |
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| CN107783456A (en) * | 2016-08-31 | 2018-03-09 | 上海唐辉电子有限公司 | A kind of MBUS communicates calorimeter data acquisition controller receiving circuit |
| CN109859590A (en) * | 2017-11-30 | 2019-06-07 | 深圳讯朋应急安全救护科技有限公司 | A kind of external chest compression training aids |
| CN109493560B (en) * | 2018-11-12 | 2020-10-16 | 中国兵器装备集团上海电控研究所 | Power cabin optical detector pollution detection light path based on far ultraviolet detector |
| CN110930682A (en) * | 2019-12-26 | 2020-03-27 | 宁波三星医疗电气股份有限公司 | MBUS communication circuit and MBUS communication system |
| CN112216095A (en) * | 2020-11-05 | 2021-01-12 | 成都市三宇仪表科技发展有限公司 | High-speed infrared communication system and method for Internet of things water meter |
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| CN203224312U (en) * | 2013-05-07 | 2013-10-02 | 沈阳市航宇星仪表有限责任公司 | Ultra-low-power intelligent-control high-precision ultrasonic heat meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203224312U (en) * | 2013-05-07 | 2013-10-02 | 沈阳市航宇星仪表有限责任公司 | Ultra-low-power intelligent-control high-precision ultrasonic heat meter |
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