CN104965420B - A kind of low interference food processor - Google Patents
A kind of low interference food processor Download PDFInfo
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- CN104965420B CN104965420B CN201510296028.9A CN201510296028A CN104965420B CN 104965420 B CN104965420 B CN 104965420B CN 201510296028 A CN201510296028 A CN 201510296028A CN 104965420 B CN104965420 B CN 104965420B
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- 235000013305 food Nutrition 0.000 title claims abstract description 45
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 38
- 239000010703 silicon Substances 0.000 claims abstract description 38
- 230000000630 rising effect Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 11
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 32
- 235000021251 pulses Nutrition 0.000 description 31
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 239000008267 milk Substances 0.000 description 5
- 210000004080 milk Anatomy 0.000 description 5
- 235000013336 milk Nutrition 0.000 description 5
- 235000010469 Glycine max Nutrition 0.000 description 4
- 244000068988 Glycine max Species 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 206010044565 Tremor Diseases 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
Abstract
A kind of low interference food processor of the present invention, including control circuit, the control circuit includes being used for load, load circuit, the control chip of the driving loaded work piece for carrying out food processing, the load circuit includes switch, the switch is controllable silicon, wherein, the control chip controls the controllable silicon in a manner of falling ripple, the control chip controls the controllable silicon with trigger pulse, the rising edge of the trigger pulse supply voltage zero crossing, the trigger pulse maintain to mains voltage variations rate minimum at.Held time by adjusting SCR trigger pulse, control chip goes out to remove trigger pulse in mains voltage variations rate minimum, so as to reduce interference caused by control machines, so as to solve the electromagnetic interference problem of resistive load.
Description
Technical field
The present invention relates to a kind of food processor, more particularly to one kind to use thyristor controlled low interference food processing
Machine.
Background technology
Food processor is used by increasing domestic consumer due to its efficient and convenient property.Existing conventional family expenses
Food processor includes following several substantially：Electric heating appliance based food processing machine, electric device based food processing machine and electric heating
With the food processor of electronic combination, realize that the crushing to material or heating are cooked.And the crushing for material is typically all adopted
Carried out with motor, the heating for material is using heater, and in the prior art, motor belongs to perceptual component, and adds
The resistive heating load that thermal is typically also selected.And in the control of food processor, in order to realize intelligent slurrying, for electricity
The control of machine and heater typically can all use the semiconductor electronic switching devices such as controllable silicon.Simultaneous Switching power supply is also being eaten
Generally used on product processing machine.
Because the motor in food processor, controllable silicon, Switching Power Supply etc. are perceptual component, can all produce at work
Raw certain electromagnetic interference.And food processor effect household electrical appliance, it is directly connected with mains supply, therefore electric caused by device
Magnetic disturbance can not only influence the normal work of other electron component in food processor；And can be to other electric equipments in power network
Produce harmful effect.Therefore, in order to reduce or eliminate these electromagnetic interferences, electromagnetic interference resistant device is set in food processor
Seem extremely important.
In the prior art, generally it is to solve electromagnetic interference directly increasing some filter circuits, in order to meet to mark
Accurate requirement, the parameter of unconfined increase filter circuit, so as to cause the cost of whole electromagnetic interference resistant device to increase, volume
Increase etc., and cause circuit structure also become more complicated therefore single increase electromagnetism interference equipment can not
The interference effect of the comprehensive solution food processor of perfection.
The content of the invention
The technical problems to be solved by the invention are to provide that a kind of circuit structure is simple, anti-jamming effectiveness is good, device parameters
The low interference food processor of optimization.
In order to solve the above technical problems, a kind of low interference food processor of the present invention, including control circuit, the control
Circuit includes being used for load, load circuit, the control chip of the driving loaded work piece for carrying out food processing, the load electricity
Road includes switch, and the switch is controllable silicon, wherein, the control chip controls the controllable silicon, the control in a manner of falling ripple
Coremaking piece controls the controllable silicon with trigger pulse, the rising edge of the trigger pulse supply voltage zero crossing, it is described to touch
Hair pulse is maintained to mains voltage variations rate minimum.
Preferably, voltage change ratio is minimum at time t0 after zero crossing for the supply voltage, the trigger pulse it is upper
Rise along the zero crossing in supply voltage, the trailing edge of the trigger pulse and maintaining at triggered time t0.
Preferably, the source nominal voltage is U, angular speed ω, instantaneous voltage V, The mains voltage variations rateDuring λ=0, t0
=pi/2 ω.
Preferably, the frequency of the supply voltage is f, ω=2 π f, t0=1/4f.
Preferably, supply frequency is prestored in the control chip.
Preferably, the frequency of the control chip detection supply voltage, the frequency of the control chip detection supply voltage
Detected, and default supply frequency is updated.
Preferably, the control circuit voltage detection circuit, the control chip pass through voltage detection circuit
Supply voltage is detected by interval time t1, and calculates the voltage rate of rise for detecting voltage before and after each time interval twice, from
And draw at mains voltage variations rate minimum.
Preferably, the μ s of t1≤100.
Preferably, the load includes heater and motor, and the load circuit includes heating control circuit, motor control
Circuit processed, the heating control circuit, circuit for controlling motor, the heating control circuit are connected in parallel in circuit for controlling motor
Between power supply, the circuit for controlling motor includes anti-electromagnetic interference circuit and motor-drive circuit, the anti-electromagnetic interference circuit
Input electrically connect the power supply, the output end of the electromagnetic interference circuit electrically connects with the motor-drive circuit.
Preferably, the anti-electromagnetic interference circuit includes：
Common mode inductance L1, two inputs of the common mode inductance L1 connect the live wire and zero line of power supply respectively, described common
Mould inductance L1 two output ends are connected to motor-drive circuit；
First electric capacity C1, the first electric capacity C1 is parallel to two inputs of the common mode inductance L1；
Second electric capacity C2, the second electric capacity C2 is parallel to affiliated common mode inductance L1 two output ends；
3rd electric capacity C3 and the 4th electric capacity C4, the 3rd electric capacity C3 one end connect one of the common mode inductance L1
Output end, the other end connection earth terminal of the electric capacity C3, one end of the 4th electric capacity C4 connects the common mode inductance L1's
Another output end, the other end connection earth terminal of the 4th electric capacity C4.
Held time by adjusting SCR trigger pulse, control chip goes out to remove triggering in mains voltage variations rate minimum
Pulse, so as to reduce interference caused by control machines, so as to solve the electromagnetic interference problem of resistive load.
Supply frequency is updated by default supply frequency and by detecting, so that electricity can be detected more accurately
The minimum electricity of buckling rate, avoid because interference caused by power supply disunity and supply frequency shakiness is to power network and equipment
Influence.
By the way that the control circuit of heater and motor is arranged in parallel so that heating work is divided with motor work
From, so as to reduce influencing each other between motor work and heating work, and because heater is resistive load, so that
Electromagnetic interference source is only between circuit for controlling motor and other inductive elements.
By the way that anti-electromagnetic interference circuit is arranged at into motor control loop, during effectively reducing motor efforts
To the interference effect of other components in circuit, and power circuit is electrically connected to the output end of anti-electromagnetic interference circuit, made
When must reuse Switching Power Supply as power circuit, electromagnetic interference caused by Switching Power Supply is avoided to whole circuit and power supply
The influence of power network.By the way that anti-electromagnetic interference circuit is arranged in circuit for controlling motor so that can be used in motor control can
Control silicon is controlled, and is easy to the adjustment to power of motor.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
Fig. 1 (a) is the SCR structure schematic diagram of the embodiment 1 of the low interference food processor of the present invention；
Fig. 1 (b) is the silicon-controlled equivalent circuit schematic diagram of the embodiment 1 of the low interference food processor of the present invention；
Fig. 1 (c) is the silicon-controlled equivalent circuit schematic diagram of the embodiment 1 of the low interference food processor of the present invention；
Fig. 2 is the voltage detecting circuit schematic diagram of the embodiment 2 of the low interference food processor of the present invention；
Fig. 3 is the system block diagram of the embodiment 3 of the low interference food processor of the present invention；
Fig. 4 is the circuit diagram of the embodiment 3 of the low interference food processor of the present invention；
Fig. 5 is the system block diagram of the embodiment 4 of the low interference food processor of the present invention；
Fig. 6 is the power zero-crossing detection circuit schematic diagram of the embodiment 5 of the low interference food processor of the present invention；
Fig. 7 is the thyristor gating circuit schematic diagram of the embodiment 5 of the low interference food processor of the present invention.
Embodiment
Embodiment 1：
A kind of low interference food processor of the present invention, including control circuit, the control circuit include being used to carry out food
The load of processing, load circuit, the control chip of the driving loaded work piece, the load circuit include switch, the switch
For controllable silicon, wherein, the control chip controls the controllable silicon in a manner of falling ripple, and the control chip is controlled with trigger pulse
The controllable silicon, in the zero crossing of supply voltage, the trigger pulse maintained to supply voltage for the rising edge of the trigger pulse
At rate of change minimum.
In the present embodiment, the load is heater, and the controllable silicon is bidirectional triode thyristor, and the control chip leads to
Cross and trigger the controllable silicon to control the heater, before the control chip triggers the controllable silicon, the control
Chip need to lead to the zero crossing that zero passage detection electric circuit inspection goes out power supply, and the control chip exports trigger pulse in power supply zero crossing,
The controlled silicon conducting is controlled, the trigger pulse is maintained to mains voltage variations rate minimum.And after the controlled silicon conducting
Determine that after trigger pulse cancels the controllable silicon is still conducting in a mains half-wave, and it is maintained always by its characteristic
Automatically shut down, needed in the mains half-wave of controlled silicon conducting after to next power supply zero crossing, the control chip output one
Individual trigger pulse.
As shown in figure 1, shown in the structure of bidirectional triode thyristor such as Fig. 1 (a), its equivalent circuit such as Fig. 1 (b), when two-way controllable
When silicon conducting direction is T1-T2, i.e., when electric current has the T1 ends to flow to T2 ends, shown in its equivalent circuit such as Fig. 1 (c).
When the control chip controls the controlled silicon conducting, the thyristor gating circuit produces in SCR control angle G
Raw trigger pulse voltage Ug and electric current I0, while turning on T2 end triodes, T2 ends triode triode amplification electric current I2 is formed
Pressure drop conducting T1 ends triode.Now, two triode operations are in saturation state, controllable silicon operating current I1=I2.Now
Even if removing trigger voltage Ug, two triodes are because current feedback still can be with normal work, but now removes triggering electricity
Pressure Ug can cause voltage Uec to raise.After triggering controllable silicon, control chip can stop output control signal in principle, still
Due to causing voltage Uec to raise when removing trigger signal, voltage Uec unexpected rise can produce larger dv/dt, and dv/dt
Bigger, the interference to power network is more serious.So dv/dt caused by voltage Uec unexpected rise is relevant with electric main.
The source nominal voltage is U, angular speed ω, instantaneous voltage V,It is described
Mains voltage variations rateDuring λ=0, t0=pi/2s ω.When the power supply
The frequency of voltage is f, ω=2 π f, t0=1/4f.
Specifically with rated voltage U=220V, rated frequency is exemplified by f=50HZ AC power：
50HZ alternating current instantaneous voltages V=311*sin (100* π * t), angular velocity omega=100* π, cycle T=2* π/ω=
1/50=20ms.
Alternating current voltage rate of change is directly proportional to the slope of ac power waveform, i.e. ac power waveform slope is bigger, voltage
Rate of change is faster, and dv/dt is bigger.And the slope of ac power waveform is exactly the derivative of alternating current voltage equation, i.e. 50HZ exchanges
Piezoelectric voltage change slope λ=311*cos (100* π * t) * 100* π, λ and time t curve is as follows：In zero crossing (t=
During 0ms and t=10ms, λ is maximum, and dv/dt caused by voltage Uec unexpected rise is maximum；Between 0~5ms, closer to exchange
Half-wave midpoint λ is smaller, and dv/dt caused by voltage Uec unexpected rise is smaller.
When time t is T/4=5ms, i.e., in alternation midpoint when, λ=0, now voltage changing rate is minimum, i.e. electricity
Press dv/dt caused by Uec unexpected rise minimum.
So the duration of the SCR trigger pulse continues to alternation midpoint from zero-crossing of alternating current
(50HZ 5ms, 60HZ 4.17ms), can now ensure that controllable silicon is fully on, and trigger pulse closes caused interference most
It is small.(50HZ 5ms, 60HZ 4.17ms) is optimum time point at alternation midpoint, while in alternation midpoint ± 3ms
Between in the range of, the trigger pulse duration closer to alternation midpoint (50HZ 5ms, 60HZ 4.17ms) disturb it is smaller,
So the means of interference are reduced within the scope of this patent close to alternation midpoint by adjusting trigger pulse.
Controlled for total power, trigger pulse can be always maintained at, so both meet that control requires, and need not turn off
Trigger pulse, completely eliminate the interference that trigger pulse shut-off is brought；During non-total power control, touched in the zero crossing of conducting half-wave
Pulse is sent out, stops trigger pulse at the midpoint of conducting half-wave：Half-power control machines turn on 1 alternation, turn off 1 friendship
Flow half-wave；/ 3rd alternations of power thyristor triggering and conducting 1, turn off 2 alternations；A quarter power is controllable
1 alternation of silicon triggering and conducting, 3 alternations are turned off, the rest may be inferred.
In the present embodiment, holding time as 5ms for trigger pulse is set directly in control chip.The control chip
5ms triggered time is directly used when triggering controllable silicon.This is based on pre- with frequency 50HZ power supply progress in advance
If of course for the controllable silicon is more accurately controlled, the control chip can be detected with the frequency of power supply, according to
The frequency detected calculates the trigger pulse time for needing to maintain.
In the present embodiment, the load is heater, and now, heating load loop need not then be set accordingly again
Electromagnetic interference resistant device can meet corresponding device requirement.
Embodiment 2：
Difference with above-described embodiment 1 is, as shown in Fig. 2 the control circuit includes voltage detection circuit, institute
State control chip and supply voltage is detected by interval time t1 by voltage detection circuit, and before and after calculating each time interval
The voltage rate of rise of voltage is detected twice, so as to draw at mains voltage variations rate minimum.
When exchanging positive half-wave input, by resistance R11, R12 partial pressure, electric capacity C8 filtering, control chip interval time t (t
=100us) detection Vad voltages, and voltage vad1, vad2 voltage rate of rise k=(vad2- are detected before and after calculating twice
Vad1)/t, removal trigger pulse is carried out at K=0.
Embodiment 3：
The difference of the present embodiment and above-described embodiment 1 is, as shown in figure 3, the load includes heater and motor,
The load circuit includes heating control circuit, circuit for controlling motor, the heating control circuit, circuit for controlling motor.At this
In embodiment, the heating control circuit and circuit for controlling motor are connected in parallel between power supply, the circuit for controlling motor bag
Anti-electromagnetic interference circuit and motor-drive circuit are included, the input of the anti-electromagnetic interference circuit electrically connects the power supply, described
The output end of electromagnetic interference circuit electrically connects with the motor-drive circuit.
As shown in figure 4, the anti-electromagnetic interference circuit includes：
Common mode inductance L1, two inputs of the common mode inductance L1 connect the live wire and zero line of power supply respectively, described common
Mould inductance L1 two output ends are connected to motor-drive circuit；
First electric capacity C1, the first electric capacity C1 is parallel to two inputs of the common mode inductance L1；
Second electric capacity C2, the second electric capacity C2 is parallel to affiliated common mode inductance L1 two output ends；
3rd electric capacity C3 and the 4th electric capacity C4, the 3rd electric capacity C3 one end connect one of the common mode inductance L1
Output end, the other end connection earth terminal of the electric capacity C3, one end of the 4th electric capacity C4 connects the common mode inductance L1's
Another output end, the other end connection earth terminal of the 4th electric capacity C4.
In general interference refers to the corresponding interference on the frequency range band in 300M, in the present embodiment, existing
The circuit structure of food processor and the functional requirement of soy bean milk making machine so that main control chip can use when controlled motor works
Different power is carried out, and in general power of motor is generally 220V etc. in 100W to 300W or so, the voltage range of its work
Level or 110V grades (100V can be considered in 110V grade that 240V can be considered in 220V grade).Therefore, the main frequency of interference
Rate section is mainly within 30M, and the interference for solving the interference its 30-300M can also solve, and the interference of this frequency range is mainly altogether
Mould disturbs, and it is big with motor speed, operating voltage Relationship Comparison, and rotating speed is higher, and voltage is higher, and interference is bigger.Soy bean milk making machine in order to
Corresponding power of motor is adjusted, typically can all use and the falling ripple of controllable silicon or copped wave are controlled, these give food processing
Owner will bring harmonic wave interference and DM EMI, and harmonic wave interference is relevant with the power of motor of existing food processor.Power is got over
Its big interference is also bigger.
Interference for below 2M, generally DM EMI cause, and settable X2 electric capacity is eliminated, and 2M-10M phase
Adjustment common mode inductance should be then needed to be eliminated, and the conduction for 10M-30M is exceeded, it needs to carry out by adjusting Y2 electric capacity
Eliminate, the first electric capacity C1 is X2 electric capacity, and 0.47uf≤C1≤1uf, the second electric capacity C2 are X2 electric capacity, 0.1uf≤C2
≤ 0.68uf, the 3rd electric capacity C3 and the 4th electric capacity C4 are Y2 electric capacity, and the 3rd electric capacity C3 and the described 4th
Electric capacity C4 is equal, 2200pf≤C3=C4≤10000pf, the common mode inductance L1,1mH≤L1≤5mH.
In the present embodiment, with rated voltage 220V, power of motor 180W-200W, the soya-bean milk powered using Switching Power Supply
Exemplified by machine, it is controlled using controllable silicon in the course of the work, and total power be present in the pulp preparing process of soy bean milk making machine beats
Slurry and half-power stir the functional requirement such as slurry and small-power startup so that motor control needs falling ripple and chop control.Cause
This, the first electric capacity C1 is X2 electric capacity, and C1=0.68uf, the second electric capacity C2 are X2 electric capacity, C2=0.22uf, described
Three electric capacity C3 and the 4th electric capacity C4 are Y2 electric capacity, and the 3rd electric capacity C3 and the 4th electric capacity C4 are equal, C3=
C4=4700pf, the common mode inductance L1, L1=2.7mH.
The control circuit of heater and motor is arranged in parallel so that and heating work is separated with motor work, so as to
Influencing each other between motor work and heating work is reduced, and because heater is resistive load, pass through above-described embodiment 1
In mode cause disturb meet demand so that electromagnetic interference source is only within circuit for controlling motor.Thus, by anti-electromagnetism
Interference circuit is arranged at motor control loop, can effectively reduce during motor efforts to other components in circuit
Interference effect.By the way that anti-electromagnetic interference circuit is arranged in circuit for controlling motor so that can be used in motor control controllable
Silicon is controlled, and is easy to the adjustment to power of motor.
It based on motor is alternating current generator that circuit connection in the present embodiment, which is, and corresponding RC can be set at motor both ends and filter
Ripple absorption circuit etc., because the circuit of property based on it is set, it will not be repeated here.Certain motor can also be direct current generator, when
When motor is direct current generator, fairing is provided with the front end of motor, the AC power that motor-drive circuit exports is converted to
Direct current signal power supply machine uses.
Embodiment 4：
As shown in figure 5, the difference of the present embodiment and above-described embodiment is, the milk making circuit also includes weak for providing
The power circuit of power supply, the input of the power circuit are connected to the output end of the anti-electromagnetic interference circuit.
Power circuit is electrically connected to the output end of anti-electromagnetic interference circuit so that reuse Switching Power Supply as power supply electricity
Lu Shi, avoid influence of the electromagnetic interference caused by Switching Power Supply to whole circuit and power generating facilities and power grids.
Embodiment 5：
The difference of the present embodiment and above-described embodiment 1 is, in the present embodiment, power zero-crossing detection circuit such as Fig. 6 institutes
To show, specific connection is not repeating one by one, and when AC power positive half-wave input, voltage is through R1, R2 partial pressure input triode Q1, and three
Pole pipe Q1 is turned on, and ZERO ends are low level, and when AC power bears half-wave input, triode Q1 cut-offs, ZERO ends are high level.
Control chip identifies AC power crossover point signal by detecting ZERO ends low and high level.
In the present embodiment, thyristor gating circuit is as shown in fig. 7, DRV ends electrical connection control chip, works as trigger pulse
When DRV is high level, triode Q3 conductings, controllable silicon T2 ends triggering and conducting；When trigger pulse DRV is low level, triode
Q3 ends, and controllable silicon T2 ends can not turn on, be held off.Wherein protective tube FUSE2 not only can be with protection circuit, Er Qie
Sampling resistor can be used as in circuit, it is lower compared to existing exclusive use manganese-copper filament resistance sampling, cost for current sample.
Held time by adjusting SCR trigger pulse, control chip is gone out removal in mains voltage variations rate minimum and touch
Pulse is sent out, so as to reduce interference caused by control machines, so as to solve the electromagnetic interference problem of resistive load.
Supply frequency is updated by default supply frequency and by detecting, so that electricity can be detected more accurately
The minimum electricity of buckling rate, avoid because interference caused by power supply disunity and supply frequency shakiness is to power network and equipment
Influence.
By the way that the control circuit of heater and motor is arranged in parallel so that heating work is divided with motor work
From, so as to reduce influencing each other between motor work and heating work, and because heater is resistive load, so that
Electromagnetic interference source is only between circuit for controlling motor and other inductive elements.
By the way that anti-electromagnetic interference circuit is arranged at into motor control loop, during effectively reducing motor efforts
To the interference effect of other components in circuit, and power circuit is electrically connected to the output end of anti-electromagnetic interference circuit, made
When must reuse Switching Power Supply as power circuit, electromagnetic interference caused by Switching Power Supply is avoided to whole circuit and power supply
The influence of power network.By the way that anti-electromagnetic interference circuit is arranged in circuit for controlling motor so that can be used in motor control can
Control silicon is controlled, and is easy to the adjustment to power of motor.
It is emphasized that protection scope of the present invention is including but not limited to above-mentioned embodiment.It should be pointed out that pair
For those skilled in the art, under the premise without departing from the principles of the invention, several modifications and improvements can also be made, this
It should also be considered as belonging to protection scope of the present invention a bit.
Claims (10)
1. a kind of low interference food processor, including control circuit, the control circuit includes being used to carry out the negative of food processing
Load circuit, the control chip carry, driven the loaded work piece, the load circuit include switch, and the switch is controllable silicon,
Characterized in that, the control chip controls the controllable silicon in a manner of falling ripple, the control chip controls institute with trigger pulse
State controllable silicon, in the zero crossing of supply voltage, the trigger pulse maintains to supply voltage to become for the rising edge of the trigger pulse
At rate minimum.
2. low interference food processor according to claim 1, it is characterised in that when the supply voltage is after zero crossing
Between at t0 voltage change ratio it is minimum, the rising edge of the trigger pulse supply voltage zero crossing, under the trigger pulse
Drop is along at maintenance triggered time t0.
3. low interference food processor according to claim 1, it is characterised in that the source nominal voltage is
U, angular speed ω, instantaneous voltage V, the mains voltage variations rate
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mi>dv</mi>
<mo>/</mo>
<mi>dt</mi>
<mo>=</mo>
<msqrt>
<mn>2</mn>
</msqrt>
<mo>*</mo>
<mi>U</mi>
<mo>*</mo>
<mi>&omega;</mi>
<mo>*</mo>
<mi>cos</mi>
<mrow>
<mo>(</mo>
<mi>&omega;t</mi>
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During λ=0, t0=pi/2s ω.
4. a kind of low interference food processor according to claim 3, it is characterised in that the frequency of the supply voltage is
F, ω=2 π f, t0=1/4f.
5. low interference food processor according to claim 4, it is characterised in that prestore power supply in the control chip
Frequency.
6. low interference food processor according to claim 4, it is characterised in that the control chip detects supply voltage
Frequency detected, and default supply frequency is updated.
7. low interference food processor according to claim 1, it is characterised in that the control circuit includes supply voltage
Circuit is detected, the control chip detects supply voltage by voltage detection circuit by interval time t1, and calculates each
The voltage rate of rise of voltage is detected before and after time interval twice, so as to draw at mains voltage variations rate minimum.
8. low interference food processor according to claim 7, it is characterised in that the μ s of t1≤100.
9. low interference food processor according to claim 1, it is characterised in that the load includes heater and electricity
Machine, the load circuit include heating control circuit, circuit for controlling motor, the heating control circuit, circuit for controlling motor, institute
State heating control circuit and circuit for controlling motor is connected in parallel between power supply, the circuit for controlling motor includes electromagnetism interference
Circuit and motor-drive circuit, the input of the anti-electromagnetic interference circuit electrically connect the power supply, the electromagnetic interference circuit
Output end electrically connected with the motor-drive circuit.
10. described low interference food processor according to claim 9, it is characterised in that the anti-electromagnetic interference circuit bag
Include：
Common mode inductance L1, two inputs of the common mode inductance L1 connect the live wire and zero line of power supply, the common mode electricity respectively
Sense L1 two output ends are connected to motor-drive circuit；
First electric capacity C1, the first electric capacity C1 is parallel to two inputs of the common mode inductance L1；
Second electric capacity C2, the second electric capacity C2 is parallel to affiliated common mode inductance L1 two output ends；
3rd electric capacity C3 and the 4th electric capacity C4, the 3rd electric capacity C3 one end connect an output of the common mode inductance L1
End, the other end connection earth terminal of the electric capacity C3, one end of the 4th electric capacity C4 connects the another of the common mode inductance L1
Individual output end, the other end connection earth terminal of the 4th electric capacity C4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510296028.9A CN104965420B (en) | 2015-06-02 | 2015-06-02 | A kind of low interference food processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510296028.9A CN104965420B (en) | 2015-06-02 | 2015-06-02 | A kind of low interference food processor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104965420A CN104965420A (en) | 2015-10-07 |
| CN104965420B true CN104965420B (en) | 2017-12-05 |
Family
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Family Applications (1)
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| CN105528007B (en) * | 2015-12-22 | 2017-04-12 | 珠海格力电器股份有限公司 | Power control device and method of disinfection cabinet and disinfection cabinet |
| CN107997601B (en) * | 2016-10-31 | 2020-08-07 | 芜湖美的厨卫电器制造有限公司 | Instant heating type heating device and control method thereof |
| CN108008175B (en) * | 2017-11-22 | 2020-05-19 | 九阳股份有限公司 | Current detection method of food processor |
| CN108227574B (en) * | 2017-12-27 | 2020-10-02 | 九阳股份有限公司 | Control method of food processing machine |
| CN110418472B (en) * | 2018-04-27 | 2021-08-17 | 广州市番禺奥莱照明电器有限公司 | Full-bright and half-bright control method for incandescent lamp |
| CN110613359A (en) * | 2018-06-20 | 2019-12-27 | 广东美的生活电器制造有限公司 | Food processor and heating device and heating method thereof |
| CN110186503B (en) * | 2019-06-04 | 2021-09-28 | 仵军红 | Sampling device for food detection |
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