CN204302714U - A kind of soy bean milk making machine signal acquisition circuit - Google Patents
A kind of soy bean milk making machine signal acquisition circuit Download PDFInfo
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- CN204302714U CN204302714U CN201420768472.7U CN201420768472U CN204302714U CN 204302714 U CN204302714 U CN 204302714U CN 201420768472 U CN201420768472 U CN 201420768472U CN 204302714 U CN204302714 U CN 204302714U
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- 235000010469 Glycine max Nutrition 0.000 title claims abstract description 41
- 244000068988 Glycine max Species 0.000 title claims abstract description 41
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- 238000002955 isolation Methods 0.000 claims abstract description 49
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
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- 230000005611 electricity Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 101001133056 Homo sapiens Mucin-1 Proteins 0.000 description 1
- 102100034256 Mucin-1 Human genes 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 235000013322 soy milk Nutrition 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
The utility model relates to a kind of soy bean milk making machine signal acquisition circuit, described soy bean milk making machine comprises signal acquisition circuit, main control chip, described signal acquisition circuit comprises temperature signal collection circuit, water level signal Acquisition Circuit, spill over Acquisition Circuit, wherein, described signal acquisition circuit adopts insulating power supply to power, described main control chip adopts non-isolated Power supply, and the data-signal of collection is sent to described main control chip by isolated communication circuit by described signal acquisition circuit.Signal acquisition circuit uses insulating power supply to power, utilize isolated communication circuit transmission to main control chip the data-signal of collection again, other power supplys in the integrated circuit of soy bean milk making machine are made no longer to need isolation, reduce the power demand of insulating power supply, thus reduce the difficulty of circuit design, also reduce circuit cost.
Description
Technical field
The utility model relates to a kind of circuit of soymilk machine, particularly relates to a kind of soy bean milk making machine signal circuit.
Background technology
On existing market, soy bean milk making machine is in order to complete slurrying better and improve the safe application performance of soy bean milk making machine, all be provided with temperature signal detection, water level signal and spill over to detect, relation between the pulping process of the former and soy bean milk making machine has, then both are also closely bound up with user's use safety.And the utilization of the collection of these signals and signal all has certain ageing, instant signal message more can make the control of soy bean milk making machine more reliable better.
Prior art is all directly with temperature sensor circuit, level electrode circuit and overflow telegraph circuit and be connected by the main control chip of soy bean milk making machine, thus make master control chip obtain temperature signal, water level signal and spill in soy bean milk making machine pulping process, although main control chip can various data-signals needed for that promptly and accurately like this.But it is well-known, soy bean milk making machine is as I class household electrical appliance, the safety demand that it will meet, make the element demand fulfillment safety requirement for detected temperatures, water level and spill over, therefore, being all by providing insulating power supply to power in prior art, controlling to use isolated drive circuit in drive circuit in load simultaneously, make circuit complicated like this, be unfavorable for the operation of soy bean milk making machine integrated circuit system.
Utility model content
The technical problems to be solved in the utility model there is provided a kind of safe and reliable, detect accurately, the soy bean milk making machine signal acquisition circuit of fast transport.
In order to solve above technical problem, a kind of soy bean milk making machine signal acquisition circuit of the utility model, described soy bean milk making machine comprises signal acquisition circuit, main control chip, described signal acquisition circuit at least comprises one in temperature signal collection circuit, water level signal Acquisition Circuit, spill over Acquisition Circuit, wherein, described signal acquisition circuit adopts insulating power supply to power, described main control chip adopts non-isolated Power supply, and the data-signal of collection is sent to described main control chip by isolated communication circuit by described signal acquisition circuit.
Preferably, described signal acquisition circuit comprises integrated acquisition chip, and data-signal is sent to described main control chip by isolated communication circuit by described integrated acquisition chip.
Preferably, the processor that can carry out pulsewidth coding to data-signal is provided with in described integrated acquisition chip.
Preferably, the processor that can carry out compressed encoding to data-signal is provided with in described integrated acquisition chip.
Preferably, described data-signal is analog signal or status signal.
Preferably, described isolated communication circuit comprises a road optical coupling isolation circuit, and the data-signal after coding is transferred to main control chip by optical coupling isolation circuit by described integrated acquisition chip.
Preferably, described data-signal comprises temperature signal, water level signal, spill over, described isolated communication circuit comprises two-way optical coupling isolation circuit, temperature signal is transferred to main control chip by a wherein road optical coupling isolation circuit by described integrated acquisition chip, and water level signal, spill over are transferred to main control chip by another road optical coupling isolation circuit by described integrated acquisition chip.
Preferably, described data-signal comprises temperature signal, water level signal, spill over, described isolated communication circuit comprises three road optical coupling isolation circuits, and temperature signal, water level signal, spill over are transferred to described main control chip respectively by a road optical coupling isolation circuit by described integrated acquisition chip.
Preferably, described signal acquisition circuit also comprises a reference data circuit, described data-signal comprises temperature signal, water level signal, spill over, described isolated communication circuit comprises three road optical coupling isolation circuits, temperature signal is transferred to described main control chip by a road optical coupling isolation circuit by described temperature signal collection circuit, water level signal is transferred to described main control chip by another road optical coupling isolation circuit by described water level signal Acquisition Circuit, and spill over is transferred to described control chip by the 3rd road optical coupling isolation circuit by described spill over testing circuit.
Signal acquisition circuit uses insulating power supply to power, utilize isolated communication circuit transmission to main control chip the data-signal of collection again, other power supplys in the integrated circuit of soy bean milk making machine are made no longer to need isolation, reduce the power demand of insulating power supply, thus reduce the difficulty of circuit design, also reduce circuit cost.
When data-signal is transferred to main control chip, utilize optical coupling isolation circuit, data are transmitted not only accurately and reliably, also can ensure that the isolation between strong and weak electricity, ensure the security regulations of overall soy bean milk making machine.
If by each circuit-switched data signal separately direct be transferred to main control chip by optical coupling isolation circuit time, then needing arranging reference data circuit, by reference to reference circuit, guaranteeing the accuracy that data are transmitted.
Arrange integrated acquisition chip at signal acquisition circuit, by integrated acquisition chip, data are carried out coded transmission to main control chip, the accuracy that data are transmitted increases.
Integrated acquisition chip is when encoded data signal, adopt the mode of pulsewidth coding, according to the size of data output pulse width of each unit, thus reduce the number of times of pulse signal saltus step in data-signal transmitting procedure, the final call duration time shortening data-signal transmission.
Integrated acquisition chip is when encoded data signal, the characteristic such as simulation, state according to institute's sampled signal carries out compression process to data-signal, in integrated acquisition chip, processing selecting is carried out to useful signal, thus reduce the transmission of hash, improve the promptness of data-signal transmission.And divide two-way to isolate analog signal and status signal to transmit, thus guarantee the sampling precision of each data-signal.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described further:
Fig. 1 is the circuit diagram of the utility model soy bean milk making machine signal acquisition circuit embodiment 1;
Fig. 2 is available data Signal coding schematic diagram;
Fig. 3 is the data signals schematic diagram of the utility model soy bean milk making machine signal acquisition circuit embodiment 1;
Fig. 4 is the data signals schematic diagram of the utility model soy bean milk making machine signal acquisition circuit embodiment 2;
Fig. 5 is the circuit diagram of the utility model soy bean milk making machine signal acquisition circuit embodiment 3;
Fig. 6 is the circuit diagram of the utility model soy bean milk making machine signal acquisition circuit embodiment 4;
Fig. 7 is the circuit diagram of the utility model soy bean milk making machine signal acquisition circuit embodiment 5.
Detailed description of the invention
Embodiment 1:
A kind of soy bean milk making machine signal acquisition circuit, described soy bean milk making machine comprises signal acquisition circuit, main control chip, described signal acquisition circuit comprises temperature signal collection circuit, water level signal Acquisition Circuit, spill over Acquisition Circuit, wherein, described signal acquisition circuit adopts insulating power supply to power, described main control chip adopts non-isolated Power supply, and the data-signal of collection is sent to described main control chip by isolated communication circuit by described signal acquisition circuit.
As shown in Figure 1, described signal acquisition circuit 2 comprises temperature signal collection circuit 21, water level signal Acquisition Circuit 22, spill over Acquisition Circuit 23 and integrated acquisition chip MCU2, described integrated acquisition chip MCU2 uses insulating power supply VDD to power, described main control chip MCU1 and other control circuits use non-isolated power vd D1, described isolated communication circuit 3 is a road optical coupling isolation circuit, and the data-signals such as temperature signal, water level signal, spill over are sent to described main control chip MCU1 by optical coupling isolation circuit by described integrated acquisition chip MUC1.Described optical coupling isolation circuit comprises optocoupler, the input anode of described optocoupler connects insulating power supply VDD by resistance R20, the input negative electrode of described optocoupler connects integrated acquisition chip MCU2, the output colelctor electrode of described optocoupler connects non-isolated power vd D1 by resistance R21 and connects main control chip MCU1, and the emitter stage of described optocoupler output connects the reference ground of non-isolated power supply.As shown in Figure 1, this is no longer going to repeat them for other circuit.
Data-signal is carried out coded transmission to described main control chip MCU1 by integrated acquisition chip MCU2, and transmits with frame data after data signals, and wherein frame data at least comprise the check code of first code, communication data and communication data.In the present embodiment, first code is at least 1 byte, and communication data has comprised each 1 byte of temperature signal, water level signal and spill over, and check code is the verification of communication data, verification mode is generally even-odd check, total check or CRC check, and check code is at least 1 byte.Therefore in the present embodiment, frame data are at least 5 bytes, are adopted the mode of pulsewidth coding to encode, thus reduce pulse signal saltus step.
Integrated acquisition chip MCU1 is to the pulsewidth coding of data-signal:
As shown in Figure 2,1 byte is 16 binary systems after encoding by existing mode, data communication time width be 16T(wherein T be unit pulsewidth), pulse signal saltus step 8 times, if communication data is S byte, then data communication time width is 16ST, pulse signal saltus step 8S time, impulse hits 0.5 time in the unit interval.And adopt pulsewidth coding mode first data-signal to be divided into N number of unit, then by the size of data output pulse width of each unit.
If communication data is S byte, being 8S is its binary number, is divided into N number of unit, and each unit is Si bit Xi (i=1,2 ... N), wherein S1+S2+ ... + SN=8S;
Then positive negative pulse stuffing is exported successively by the time width of (Xi+a) * T, when wherein Xi=0 is guaranteed in a >=1, pulse width is non-vanishing, get a=1 herein, pulse signal saltus step N time, data communication time width be [(X1+1)+(X2+1)+... (XN+1)] * T=[(X1+X2+ ... XN)+N] * T.
0≤Xi≤
, the probability average of Xi is
, then can obtain:
N*T≤data communication time width≤
,
Data communication time width probability average out to
The condition that communication reliability improves is a frame data impulse hits number of times minimizing and call duration time does not increase, and namely only needs to ensure:
，N<8s；
For ease of process, generally make Si equal, be 8s/N, then can obtain: 4S≤N<8S;
For making impulse hits reduce at most, then get N=4S, now impulse hits number of times is 4S, 4ST≤data communication time width≤4S*4=16ST, data communication time width probability average out to
, impulse hits probability average out to 0.4 time in unit interval T.
As shown in Figure 3, the data-signal of 1 byte is divided into 4 unit, each unit is two bit bitai (i=0,1,2,3), between 0 to 3, data pulse time width between 4T to 16T, pulse signal saltus step 4 times.
After visible employing pulsewidth coding mode, data communication maximum time width does not increase, probability average communication data reduces 37.5%, and impulse hits number of times reduces 50%, impulse hits number of times probability decreased average 20% in unit interval T, the possibility that signal is disturbed obviously reduces, and communication reliability obviously promotes.
Therefore, the one for the present embodiment expands distortion, also can cancel check code byte, check code byte cancel after call duration time and transition times reduce further, reliability is got back lifting.
Embodiment 2:
The difference of the present embodiment and above-described embodiment 1 is, integrated acquisition chip MCU1 is transferred to main control chip by after data signals, its coded system adopted be by data-signal according to the characteristic such as simulation, state to data-signal carry out compression process.
In the present embodiment, sampled signal is temperature signal, water level signal and spill over, and wherein temperature signal is analog signal, and water level signal and spill over are status signal.
Analog signal compression method:
Generally there is a significant span interval [a, b] and minimum resolution s in analog signal, compression method analog signal is converted to meaningful and meets the data-signal of resolution requirement, i.e. [0, (b-a)/s]; As temperature signal sample time, general use 8 AD values are sampled, its sampled value is [0 in theory,, but in fact significant span is [40,160] 255], the minimum resolution of demand is 2, then after the method compression, data interval is [0,60], thus can by 8 figure place boil down to 6 figure places.
Status signal compression method:
Status signal generally has n different state, now only its state need be numbered by 0 to n-1, and using the value of its number as its status signal, this is the compression method of status signal.As water level signal only has water and anhydrous two states, can by 8 original bit boil down to 1 bits.
By effectively compressing data with analog signals, status signal compression method.
In conjunction with above 1) and 2), one frame data comprise first code, temperature, water level and anti-overflow, wherein temperature is 8 bit Wbit7-0, water level and be anti-overflowly 3 bit Sbit2-0 and Ybit2-0 (namely water level signal is divided into 8 states from there being water to anhydrous, anti-overflow signal is prevented being divided into 8 states from touching to prevent not touching), after integrated acquisition chip coding as shown in Figure 4, first code is fixed as the signal that pulse width is N*T (N >=8), and first code pulse width plays the effect corrected unit pulsewidth simultaneously.A frame data communication time is reduced to 15T to 36T (probability average out to 25.5T) by 72T thus, impulse hits number of times is reduced to 8 times by more than 32 times, unit interval impulse hits number of times is reduced to 0.31 by 0.44, call duration time and impulse hits improve obviously, and communication reliability promotes obviously.
Embodiment 3:
As shown in Figure 5, the difference of the present embodiment and above-described embodiment 1 is, described isolated communication circuit 3 comprises two-way optical coupling isolation circuit, temperature signal is transferred to main control chip by a wherein road optical coupling isolation circuit by described integrated acquisition chip, and water level signal, spill over are transferred to main control chip by another road optical coupling isolation circuit by described integrated acquisition chip.Physical circuit connects as shown in Figure 5, and this is no longer going to repeat them.
Certainly, under the setting of two optical coupling isolation circuits, the transmission of signal also can be carried out by the mode of serial communication.
Embodiment 4:
The difference of the present embodiment and above-described embodiment 1 is: described isolated communication circuit comprises three road optical coupling isolation circuits, and temperature signal, water level signal, spill over are transferred to described main control chip respectively by a road optical coupling isolation circuit by described integrated acquisition chip.As shown in Figure 6, physical circuit connection repeats no longer one by one.
In this enforcement, except outside the signal transmission form that can adopt in above-described embodiment 1 and embodiment 2, for water level signal, spill over, the signal collected directly is exported to optical coupling isolation circuit by integrated acquisition chip MCU2, collection signal is transferred to governor circuit by optical coupling isolation circuit immediately, can not encode.
For temperature signal, it belongs to simulation AD signal, the signal collected is converted to high-frequency PWM signal and exports to optical coupling isolation circuit through delivery outlet WDout by integrated acquisition chip MCU1, and pwm signal is restored to AD signal and is transferred to main control chip MCU1 by the filtering (filter circuit that resistance R325, R326 and electric capacity C5 as optocoupler U3 output form) of optical coupling isolation circuit output.
Embodiment 5:
A kind of soy bean milk making machine signal acquisition circuit and method for transmitting signals, described soy bean milk making machine comprises signal acquisition circuit, main control chip, described signal acquisition circuit comprises temperature signal collection circuit, water level signal Acquisition Circuit, spill over Acquisition Circuit, wherein, described signal acquisition circuit adopts insulating power supply to power, described main control chip adopts non-isolated Power supply, and the data-signal of collection is sent to described main control chip by isolated communication circuit by described signal acquisition circuit.
As shown in Figure 7, described signal acquisition circuit also comprises a reference data circuit 44, described isolation comprises three road optical coupling isolation circuits by circuit, temperature signal is transferred to described main control chip by a road optical coupling isolation circuit by described temperature signal collection circuit, water level signal is transferred to described main control chip by another road optical coupling isolation circuit by described water level signal Acquisition Circuit, and spill over is transferred to described control chip by the 3rd road optical coupling isolation circuit by described spill over testing circuit.Physical circuit as shown in Figure 7, repeats no longer one by one.
In the present embodiment, when water level signal and spill over are gathered, water level or spilling resistance variations will cause the input LED current linear change of optocoupler, according to the operating characteristic of optocoupler, its output current is also by linear change, finally cause optocoupler to export to the voltage generation linear change of Master control chip, also just sampled signal is passed to Master control chip timely.Wherein resistance R45 is for regulating the input light emitting diode of optocoupler in suitable working range, and resistance R420 is used for the input light emitting diode current limliting to optocoupler.
If signal resistance is very large, when causing the input LED current of optocoupler to change very little, 42 circuit can be adopted to utilize transistor Q1 to carry out expansion stream, and then make the input light emitting diode of optocoupler in suitable working range, wherein resistance R422 is used for the input light emitting diode current limliting to optocoupler.Therefore can replace use for the circuit of signals collecting in 42 circuit and 41 circuit, whether use transistor to carry out expansion stream, determine according to circuit actual demand.
For signals such as temperature, the parameter due to optocoupler there are differences and temperature sampling required precision is higher, therefore adopts the result of reference data circuit to temperature signal collection circuit to correct.
Signal acquisition circuit uses insulating power supply to power, utilize isolated communication circuit transmission to main control chip the data-signal of collection again, other power supplys in the integrated circuit of soy bean milk making machine are made no longer to need isolation, reduce the power demand of insulating power supply, thus reduce the difficulty of circuit design, also reduce circuit cost.
When data-signal is transferred to main control chip, utilize optical coupling isolation circuit, data are transmitted not only accurately and reliably, also can ensure that the isolation between strong and weak electricity, ensure the security regulations of overall soy bean milk making machine.
If by each circuit-switched data signal separately direct be transferred to main control chip by optical coupling isolation circuit time, then needing arranging reference data circuit, by reference to reference circuit, guaranteeing the accuracy that data are transmitted.
Arrange integrated acquisition chip at signal acquisition circuit, by integrated acquisition chip, data are carried out coded transmission to main control chip, the accuracy that data are transmitted increases.
Integrated acquisition chip is when encoded data signal, adopt the mode of pulsewidth coding, according to the size of data output pulse width of each unit, thus reduce the number of times of pulse signal saltus step in data-signal transmitting procedure, the final call duration time shortening data-signal transmission.
Integrated acquisition chip is when encoded data signal, the characteristic such as simulation, state according to institute's sampled signal carries out compression process to data-signal, in integrated acquisition chip, processing selecting is carried out to useful signal, thus reduce the transmission of hash, improve the promptness of data-signal transmission.And divide two-way to isolate analog signal and status signal to transmit, thus guarantee the sampling precision of each data-signal.
It is emphasized that protection domain of the present utility model is including but not limited to above-mentioned detailed description of the invention.It should be pointed out that for a person skilled in the art, under the prerequisite not departing from the utility model principle, can also make some distortion and improvement, these also should be regarded as belonging to protection domain of the present utility model.
Claims (9)
1. a soy bean milk making machine signal acquisition circuit, described soy bean milk making machine comprises signal acquisition circuit, main control chip, described signal acquisition circuit at least comprises one in temperature signal collection circuit, water level signal Acquisition Circuit, spill over Acquisition Circuit, it is characterized in that, described signal acquisition circuit adopts insulating power supply to power, described main control chip adopts non-isolated Power supply, and the data-signal of collection is sent to described main control chip by isolated communication circuit by described signal acquisition circuit.
2. soy bean milk making machine signal acquisition circuit according to claim 1, is characterized in that, described signal acquisition circuit comprises integrated acquisition chip, and data-signal is sent to described main control chip by isolated communication circuit by described integrated acquisition chip.
3. soy bean milk making machine signal acquisition circuit according to claim 2, is characterized in that, is provided with the processor that can carry out pulsewidth coding to data-signal in described integrated acquisition chip.
4. soy bean milk making machine signal acquisition circuit according to claim 2, is characterized in that, is provided with the processor that can carry out compressed encoding to data-signal in described integrated acquisition chip.
5. soy bean milk making machine signal acquisition circuit according to claim 4, is characterized in that, described data-signal is analog signal or status signal.
6. soy bean milk making machine signal acquisition circuit according to claim 2, is characterized in that, described isolated communication circuit comprises a road optical coupling isolation circuit, and the data-signal after coding is transferred to main control chip by optical coupling isolation circuit by described integrated acquisition chip.
7. according to asking soy bean milk making machine signal acquisition circuit according to claim 2, it is characterized in that, described data-signal comprises temperature signal, water level signal, spill over, described isolated communication circuit comprises two-way optical coupling isolation circuit, temperature signal is transferred to main control chip by a wherein road optical coupling isolation circuit by described integrated acquisition chip, and water level signal, spill over are transferred to main control chip by another road optical coupling isolation circuit by described integrated acquisition chip.
8. according to asking soy bean milk making machine signal acquisition circuit according to claim 2, it is characterized in that, described data-signal comprises temperature signal, water level signal, spill over, described isolated communication circuit comprises three road optical coupling isolation circuits, and temperature signal, water level signal, spill over are transferred to described main control chip respectively by a road optical coupling isolation circuit by described integrated acquisition chip.
9. soy bean milk making machine signal acquisition circuit according to claim 1, it is characterized in that, described signal acquisition circuit also comprises a reference data circuit, described data-signal comprises temperature signal, water level signal, spill over, described isolated communication circuit comprises three road optical coupling isolation circuits, temperature signal is transferred to described main control chip by a road optical coupling isolation circuit by described temperature signal collection circuit, water level signal is transferred to described main control chip by another road optical coupling isolation circuit by described water level signal Acquisition Circuit, spill over is transferred to described control chip by the 3rd road optical coupling isolation circuit by described spill over testing circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112806842A (en) * | 2019-11-18 | 2021-05-18 | 九阳股份有限公司 | Pressure cooking appliance with split-type connected upper cover and cooking control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112806842A (en) * | 2019-11-18 | 2021-05-18 | 九阳股份有限公司 | Pressure cooking appliance with split-type connected upper cover and cooking control method thereof |
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Address after: 310018 No. 760 Yinhai Street, Xiasha Street, Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee after: HANGZHOU JIUYANG HOUSEHOLD ELECTRICAL APPLIANCES CO.,LTD. Country or region after: China Address before: 310018, No. 52, No. 22, Poplar Street, Hangzhou economic and Technological Development Zone, Zhejiang Patentee before: HANGZHOU JIUYANG HOUSEHOLD ELECTRICAL APPLIANCES CO.,LTD. Country or region before: China |
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