CN209105030U - A kind of control circuit of food processor - Google Patents
A kind of control circuit of food processor Download PDFInfo
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- CN209105030U CN209105030U CN201821961703.0U CN201821961703U CN209105030U CN 209105030 U CN209105030 U CN 209105030U CN 201821961703 U CN201821961703 U CN 201821961703U CN 209105030 U CN209105030 U CN 209105030U
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Abstract
The utility model embodiment discloses a kind of control circuit of food processor, including Switching Power Supply, the Switching Power Supply includes the rectification unit, transformer unit and power output unit being sequentially connected, and power output unit includes the first output unit for exporting the first power vd D1 and the second output unit for exporting second source VDD2；First output unit includes light current ground GND, and the second output unit and transformer unit include forceful electric power ground SGND；First power supply is less than second source, and the difference of the first power supply and second source is greater than 5V；Pass through the example scheme, increase Y capacitance between the end Switching Power Supply SGND and GND, filter out the noise generated in the Switching Power Supply course of work, avoid Switching Power Supply work cause to radiate it is exceeded, to improve the EMC performance of high power switching power supply, solve the problems, such as that high power switching power supply EMC can not pass through.
Description
Technical field
The utility model relates to cooking equipment control technology, espespecially a kind of control circuit of food processor.
Background technique
Currently, all having electromagnetic compatibility EMC circuit food processor (such as soy bean milk making machine), commercialized product be must satisfy
The product of EMC authentication requesting, certain model is more complicated compared to conventional household machine, particular with rotary valve, solenoid valve, water pump etc.
The larger device of power, switching power supply parts need design more high-power, however Switching Power Supply also adds external radiation after power increase
Greatly, it is also bigger to generate interfering noise, eventually leading to EMC test can not pass through, and ordinary circumstance can be changed by increasing Y capacitance
It is kind, but will lead to residual voltage test after increasing Y capacitance and do not pass through, it also will affect launch.
Utility model content
The utility model embodiment provides a kind of control circuit of food processor, can be improved high power switching power supply
EMC performance, solve the problems, such as that high power switching power supply EMC can not pass through.
In order to reach the utility model embodiment purpose, the utility model embodiment provides a kind of control of food processor
Circuit processed, including Switching Power Supply, the Switching Power Supply include rectification unit, transformer unit and power supply the output list being sequentially connected
Member, the power output unit include the first output unit for exporting the first power vd D1, and for exporting the second electricity
The second output unit of source VDD2；First output unit includes light current ground GND, second output unit and the transformation
Device unit includes forceful electric power ground SGND；First power supply is less than the second source, first power supply and the second source
Difference be greater than 5V；
Wherein, the first Y capacitance GND and the forceful electric power in the light current is provided between SGND.
In the exemplary embodiment of the utility model, the power output unit of the Switching Power Supply can also include being used for
Export the second output unit of second source VDD2；
The first power vd D1 and the light current the first load resistance is connected between GND；
The second source VDD2 and the forceful electric power the second load resistance is connected between SGND.
In the exemplary embodiment of the utility model, the capacitance C1 of first Y capacitance be can satisfy: 0.1nF≤
C1≤0.3nF。
In the exemplary embodiment of the utility model, the resistance value of first load resistance and second load resistance
Can satisfy: less than or equal to 5K Ω.
In the exemplary embodiment of the utility model, the Switching Power Supply can also include filtering input unit, described
Filtering input unit is set to before the rectification unit, and the filtering input unit may include: to be set to positive input line
On first diode, and be set to the first diode rear end, and be parallel to the positive input line and cathode is defeated
Enter the first input capacitance between line；The anode of the first diode is power input；
Discharge resistance is provided between the first diode and first input capacitance；The discharge resistance connection
Between the positive input line and the cathode input line.
In the exemplary embodiment of the utility model, the resistance value R of the discharge resistance be can satisfy: 200-470K Ω；
The discharge resistance can be the Chip-R of 1206 encapsulation.
In the exemplary embodiment of the utility model, the transformer unit may include: primary coil；
The primary coil and filter capacitor, filter resistance and the second Diode series；Wherein, the one of the filter capacitor
End is connected with the input terminal of the primary coil, and the anode of second diode is connected with the output end of the primary coil.
In the exemplary embodiment of the utility model, the resistance value of the filter resistance be can satisfy: 47 Ω to 100 Ω.
In the exemplary embodiment of the utility model, the control circuit can also include being set to the Switching Power Supply
Electromagnetic compatibility EMC module between mains supply interface；
The EMC module may include: the second Y capacitance being connected between firewire and ground and be connected to zero curve and ground
Between third Y capacitance；
The capacitance of second Y capacitance and the third Y capacitance is all satisfied: 1.0nF to 2.2nF.
In the exemplary embodiment of the utility model, the control circuit further includes power supply control chip；The power supply
Control chip is connected with the rectification unit and the transformer unit respectively；
Switching device is provided in the power supply control chip, the switching device is Metal-Oxide Semiconductor field effect
Answer transistor MOSFET；
Wherein, the pressure voltage of the MOSFET is at least 650V.
The beneficial effect of the utility model embodiment may include:
1, the control circuit of the food processor of the utility model embodiment, including Switching Power Supply, the Switching Power Supply packet
Include the rectification unit, transformer unit and power output unit being sequentially connected, the power output unit includes for exporting the
The first output unit of one power vd D1, and the second output unit for exporting second source VDD2；First output
Unit includes light current ground GND, and second output unit and the transformer unit include forceful electric power ground SGND；First power supply
Less than the second source, the difference of first power supply and the second source is greater than 5V；Wherein, in the light current GND
And the forceful electric power be provided with the first Y capacitance between SGND.By the example scheme, the end Switching Power Supply SGND and GND it
Between increase Y capacitance, filter out the noise generated in the Switching Power Supply course of work, avoid Switching Power Supply work cause to radiate it is exceeded, from
And the EMC performance of high power switching power supply is improved, solve the problems, such as that high power switching power supply EMC can not pass through.
2, the power output unit of the Switching Power Supply of the utility model embodiment can also include for exporting second
The second output unit of power vd D2；The first power vd D1 and the light current the first load resistance is connected between GND；
The second source VDD2 and the forceful electric power the second load resistance is connected between SGND.Pass through the example scheme, a side
Face can improve the cross regulation rate of Switching Power Supply, stablize input voltage fluctuation, on the other hand, once there is power blackout situation,
Output of the ground output capacitance between GND and second source VDD2 and the forceful electric power between SGND of first power vd D1 and light current ground
Capacitor can be discharged rapidly by the first load resistance of load resistance and the second load resistance by charge is stored respectively, avoid the electricity
Pressure influences fiery zero curve voltage-to-ground.
3, the capacitance C1 of first Y capacitance of the utility model embodiment can satisfy: 0.1nF≤C1≤0.3nF.
By the example scheme, can make the discharge time on firewire and zero curve over the ground not be will increase too much, and can guarantee
The inhibitory effect of switching power supply noise.
4, first load resistance of the utility model embodiment and the resistance value of second load resistance can expire
Foot: less than is equal to 5K Ω.By the example scheme, when discharge process can will not be made too long, and can make standby
Increased power consumption will not be too many.
5, the Switching Power Supply of the utility model embodiment can also include filtering input unit, and the filtering input is single
Member is set to before the rectification unit, and the filtering input unit may include: the one or two be set in positive input line
Pole pipe, and it is set to the first diode rear end, and be parallel between the positive input line and cathode input line
First input capacitance；The anode of the first diode is power input；In the first diode and first input
Discharge resistance is provided between capacitor；The discharge resistance is connected between the positive input line and the cathode input line.
By the example scheme, the residual voltage in the first input capacitance can be made to discharge rapidly, the influence of residual voltage is dropped to
It is minimum.
6, the resistance value R of the discharge resistance of the utility model embodiment can satisfy: 200-470K Ω；The electric discharge electricity
Resistance can be the Chip-R of 1206 encapsulation.Pass through the example scheme, it can be ensured that electric discharge rapidly, while being avoided to complete machine function
The influence of consumption.
7, the transformer unit of the utility model embodiment may include: primary coil；The primary coil and filter
Wave capacitor, filter resistance and the second Diode series；Wherein, the input terminal of one end of the filter capacitor and the primary coil
It is connected, the anode of second diode is connected with the output end of the primary coil.By the example scheme, may be implemented
Further improving Switching Power Supply generation by adjusting primary coil spike absorption circuit filtering parameter (such as filter resistance)
Noise.
The other feature and advantage of the utility model embodiment will illustrate in the following description, also, partly from
It becomes apparent in specification, or is understood and implementing the utility model.The purpose of the utility model embodiment and its
He can be achieved and obtained advantage by structure specifically noted in the specification, claims and drawings.
Detailed description of the invention
Attached drawing is used to provide one for further understanding the utility model embodiment technical solution, and constituting specification
Part, is used to explain the technical solution of the utility model embodiment together with embodiments herein, does not constitute practical to this
The limitation of new embodiment technical solution.
Fig. 1 is the control circuit structural representation of the food processor of the utility model embodiment；
Fig. 2 is a kind of circuit composition schematic diagram of the control circuit of the food processor of the utility model embodiment；
Fig. 3 is the filtering input unit schematic diagram of the food processor of the utility model embodiment.
Specific embodiment
For the objectives, technical solutions, and advantages of the embodiments of the present invention are more clearly understood, below in conjunction with attached
The embodiments of the present invention are described in detail in figure.It should be noted that in the absence of conflict, the reality in the application
The feature applied in example and embodiment can mutual any combination.
Embodiment one
The utility model embodiment provides a kind of control circuit of food processor, as shown in Figure 1 and Figure 2, may include
Switching Power Supply 1, the Switching Power Supply 1 may include rectification unit 11, transformer unit 12 and power supply the output list being sequentially connected
Member 13, the power output unit 13 includes the first output unit 131 for exporting the first power vd D1, and for exporting
The second output unit 132 of second source VDD2；Including light current GND, second output are single for first output unit 131
Member 132 and including forceful electric power the SGND of the transformer unit 12；First power supply is less than the second source, first electricity
The difference of source and the second source is greater than 5V；
Wherein, the first Y capacitance CY1 GND and the forceful electric power in the light current is provided between SGND.
In the exemplary embodiment of the utility model, the first power supply can be light current power supply, such as 3V-5V, second source
It can be forceful electric power power supply, such as 9V, 12V, 24V.
In the exemplary embodiment of the utility model, which is DC rectifier unit.
In the exemplary embodiment of the utility model, food processor using the general power of Switching Power Supply in 10W or more,
And food processor bringing onto load range is also wider, load may change in several milliamperes to several hundred milliamperes, therefore Switching Power Supply
Switching frequency also is not stopping to change, and unsteady flow and generation noise also are not stopping to change in transformer, causes Switching Power Supply external in this way
The noise of radiation is also bigger, especially when load circuit is larger, is difficult to harass by power supply linear heat generation rate and test.Switching Power Supply
On the noise of generation by forceful electric power can enter zero-power line end in the end SGND, at this point, in Switching Power Supply forceful electric power the end SGND
With light current increase Y capacitance between GND, the noise generated in the Switching Power Supply course of work can be filtered out, avoids Switching Power Supply work
It causes to radiate exceeded.
Embodiment two
The embodiment on the basis of example 1, gives the type selecting embodiment of the first Y capacitance CY1.
The output unit of the Switching Power Supply can also include the second output unit for exporting second source VDD2；
In the exemplary embodiment of the utility model, the capacitance of the first Y capacitance CY1 be can satisfy: 0.1nF≤
CY3≤0.3nF。
In the exemplary embodiment of the utility model, Y capacitance is accessed between SGND and GND, can solve power spoke
Problem is penetrated, but after increasing Y capacitance, fiery zero curve will increase the residual voltage between GND after power-off, and SGND is accessed by VDD2
N line, after increasing CY1, CY1 meeting storage section charge extends electric discharge duration over the ground on zero curve, eventually leads to residual voltage survey
Examination is above standard requirements, in order to solve this problem, the CY1 capacitance C1 in this embodiment scheme answer it is as small as possible, but when C1 mistake
Hour, the capacitance C1 for the CY1 that is just deteriorated, therefore can select to switching power supply noise inhibitory effect can meet: 0.1nF≤C1
≤0.3nF。
Embodiment three
The embodiment gives the output end loading resistance of transformer unit 12 on the basis of embodiment one or two
Example scheme.
In the exemplary embodiment of the utility model, the power output unit 13 of the Switching Power Supply can also include using
In the second output unit 132 of output second source VDD2；
The first power vd D1 and the light current the first load resistance R1 is connected between GND；
The second source VDD2 and the forceful electric power the second load resistance R2 is connected between SGND.
In the exemplary embodiment of the utility model, the first load resistance R1 and the second load resistance R2's
Resistance value can satisfy: less than or it is equal to 5K Ω.
In the exemplary embodiment of the utility model, (such as Fig. 2 is real for the output capacitance of the output end setting of transformer unit
Apply the output capacitance EC1 and EC2 in example) some charges can be stored in machine power-off, when carrying out residual voltage test, this
Discharge voltage in partition capacitance can be added to firewire voltage-to-ground and zero curve voltage-to-ground, cause residual voltage test that can not lead to
It crosses, after accessing load resistance between VDD1 and GND and VDD2 and SGND, on the one hand can improve the intersection adjustment of Switching Power Supply
Rate stablizes input voltage fluctuation, and on the other hand, once there is power blackout situation, output capacitance EC1 and EC2 can pass through respectively
Load resistance R1 and R2 is discharged charge is stored rapidly, and avoids the voltage influence to fiery zero curve voltage-to-ground.
In the exemplary embodiment of the utility model, generally, it is contemplated selecting resistance value to load resistance R1 and R2
It is excessive, will lead to discharge time it is too long and do not have answer it is effective, and load resistance R1 and R2 selection resistance value it is too small, then will lead to
Power consumption when standby increases, and therefore, the resistance value of load resistance R1 and R2 can be selected between 2K Ω to 10K Ω.
Example IV
The embodiment gives the embodiment that discharge resistance is arranged in Switching Power Supply on the basis of above-mentioned any embodiment
Scheme.
In the exemplary embodiment of the utility model, the Switching Power Supply can also include filtering input unit 14, institute
It states filtering input unit 14 to be set to before the rectification unit 11, the filtering input unit 14 may include: to be set to just
First diode in the input line of pole, and it is set to the first diode rear end, and be parallel to the positive input line
The first input capacitance between cathode input line；The anode of the first diode is power input；
Discharge resistance is provided between the first diode and first input capacitance；The discharge resistance connection
Between the positive input line and the cathode input line.
In the exemplary embodiment of the utility model, which may include one or more, when comprising more
When a, multiple first diodes can be arranged in series, as shown in D1, D2 in Fig. 2, Fig. 3.
In the exemplary embodiment of the utility model, which may include one or more, when comprising
When multiple, multiple first input capacitances can be parallel between positive input line and cathode input line, in Fig. 2, Fig. 3
Shown in EC01, EC02.
In the exemplary embodiment of the utility model, which may include one or more, when comprising multiple
When, multiple discharge resistances reconnect between positive input line and cathode input line after can connecting, simultaneously with the first input capacitance
Connection, as shown in R3, R4 in Fig. 3.
In the exemplary embodiment of the utility model, since Switching Power Supply power designs are larger, the input of selection
Capacitor EC01 and EC02 is also bigger, which can store more charge when selecting specification bigger, once power-off, rectification
Diode D1, D2 reversely end, and EC01 and EC02 can only then be discharged by CY2 in EMC module and CY3, will will increase at this time
Residual voltage electric discharge duration, may cause residual voltage test can not pass through, on Switching Power Supply input capacitance EC01 and EC02
Parallel resistance (R3 and R4 in such as Fig. 3), can play discharge process, once storage charge is rapid on power-off, EC01 and EC02
It is discharged by R3 and R4, it in this way can be being preferably minimized on residual voltage influence.
Embodiment five
The embodiment gives the type selecting embodiment of discharge resistance on the basis of example IV.
In the exemplary embodiment of the utility model, the resistance value R of the discharge resistance be can satisfy: 200-470K Ω；
The discharge resistance can be the Chip-R of 1206 encapsulation.
It, can be by since R3 and R4 is between Switching Power Supply input capacitance in the exemplary embodiment of the utility model
To stronger voltge surge, discharge resistance selection is excessive, influences whether electric discharge duration, and selection is too small, influences stand-by power consumption,
Simultaneously can pressure resistance to discharge resistance itself and power requirement it is relatively high, comprehensively consider, the patches of two 1206 encapsulation can be selected
Sheet resistance series connection guarantees reliability, while its resistance value can be selected in 200K between 470K, it is ensured that discharge time is rapid, simultaneously
Avoid the influence to Overall Power Consumption.
Embodiment six
The embodiment gives and filter is arranged at switching mode power supply transformer primary coil on the basis of above-mentioned any embodiment
The example scheme of wave resistance.
In the exemplary embodiment of the utility model, the transformer unit 12 may include: primary coil 121；
The primary coil 121 can connect with filter capacitor C1, filter resistance R5 and the second diode D3；Wherein, institute
The one end for stating filter capacitor C1 is connected with the input terminal of the primary coil 121, the anode of the second diode D3 with it is described
The output end of primary coil 121 is connected.
In the exemplary embodiment of the utility model, by adjusting spike absorption circuit (the i.e. phase of primary coil
The circuit of mutual concatenated filter capacitor C1, filter resistance R5 and the second diode D3 composition) filtering parameter can further change
The noise that kind Switching Power Supply generates in this embodiment scheme, has Switching Power Supply entirety electromagnetic noise by adjusting the resistance value of R5
Obvious influence.
In the exemplary embodiment of the utility model, the resistance value of the filter resistance R5 be can satisfy: 47 Ω to 100
Ω。
In the exemplary embodiment of the utility model, when R5 selects excessive, it will lead to power supply control chip in Fig. 2 and (open
Closing device) Metal-Oxide Semiconductor field effect transistor M OSFET bears high voltage in K, and it may cause MOSFET pipe and hit
When wearing, and selecting too small, spike filter effect is unobvious, and the external electromagnetic interference of Switching Power Supply generation is bigger, may lead
Cause power harassing and wrecking unqualified, under normal circumstances, can choose R5 is 47 Ω between 100 Ω.
Embodiment seven
The embodiment gives the type selecting embodiment of the Y capacitance in EMC module 2 on the basis of above-mentioned any embodiment.
In the exemplary embodiment of the utility model, the control circuit can also include being set to the Switching Power Supply
Electromagnetic compatibility EMC module 2 between 1 and mains supply interface；
The EMC module 2 may include: the second Y capacitance CY2 being connected between firewire L and ground and be connected to zero curve N
Third Y capacitance CY3 between ground；
The capacitance of the second Y capacitance CY2 and the third Y capacitance CY3 are all satisfied: 1.0nF to 2.2nF.
In the exemplary embodiment of the utility model, the selection of CY2 and CY3 are very crucial, when the parameters selection is excessive,
It will have a direct impact on the test data of residual voltage, and select too small, then influence EMC conduction test, filter effect is caused to be deteriorated,
The capacitance of comprehensive assessment, CY2 and CY3 can choose 1.0nF to 2.2nF, it is ensured that complete machine noise reduction effect, while can reduce to residual
Remaining voltage influence avoids influencing product certification listing.
In the exemplary embodiment of the utility model, the output end of EMC module 2 can connect food processing control loop
3, for example, mashing heating control circuit.
Embodiment eight
The embodiment gives the type selecting embodiment of the Y capacitance in EMC module 2 on the basis of embodiment six.
In the exemplary embodiment of the utility model, as shown in Fig. 2, the control circuit can also include that power supply controls
Chip 15；The power supply control chip 15 is connected with the rectification unit 11 and the transformer unit 12 respectively；
Switching device is provided in the power supply control chip 15, the switching device is Metal-Oxide Semiconductor field
Effect transistor MOSFET；
Wherein, the pressure voltage of the MOSFET is at least 650V.
In the exemplary embodiment of the utility model, it is dry that Switching Power Supply generation electromagnetism can be reduced by increase R5 value
It disturbs, but also will increase the spike at the both ends MOSFET (abbreviation MOS) simultaneously, MOS pressure resistance is easy to lead when selecting less than normal
Breakdown is caused, in order to guarantee operational reliability of switch power supply, metal-oxide-semiconductor pressure resistance can select 650V.
The beneficial effect of the utility model embodiment may include:
1, the control circuit of the food processor of the utility model embodiment, including Switching Power Supply described in Switching Power Supply includes
Rectification unit, transformer unit and the power output unit being sequentially connected, the power output unit include for exporting first
The first output unit of power vd D1, and the second output unit for exporting second source VDD2；First output is single
Member including light current GND, second output unit and the transformer unit include forceful electric power ground SGND；First power supply is small
In the second source, the difference of first power supply and the second source is greater than 5V；Wherein, in the light current GND and
The forceful electric power the first Y capacitance is provided between SGND.Through the example scheme, between the end Switching Power Supply SGND and GND
Increase Y capacitance, filter out the noise generated in the Switching Power Supply course of work, avoid Switching Power Supply work cause to radiate it is exceeded, thus
The EMC performance for improving high power switching power supply solves the problems, such as that high power switching power supply EMC can not pass through.
2, the power output unit of the Switching Power Supply of the utility model embodiment can also include for exporting second
The second output unit of power vd D2；The first power vd D1 and the light current the first load resistance is connected between GND；
The second source VDD2 and the forceful electric power the second load resistance is connected between SGND.Pass through the example scheme, a side
Face can improve the cross regulation rate of Switching Power Supply, stablize input voltage fluctuation, on the other hand, once there is power blackout situation,
Output of the ground output capacitance between GND and second source VDD2 and the forceful electric power between SGND of first power vd D1 and light current ground
Capacitor can be discharged rapidly by the first load resistance of load resistance and the second load resistance by charge is stored respectively, avoid the electricity
Pressure influences fiery zero curve voltage-to-ground.
3, the capacitance C1 of first Y capacitance of the utility model embodiment can satisfy: 0.1nF≤C1≤0.3nF.
By the example scheme, can make the discharge time on firewire and zero curve over the ground not be will increase too much, and can guarantee
The inhibitory effect of switching power supply noise.
4, first load resistance of the utility model embodiment and the resistance value of second load resistance can expire
Foot: less than is equal to 5K Ω.By the example scheme, when discharge process can will not be made too long, and can make standby
Increased power consumption will not be too many.
5, the Switching Power Supply of the utility model embodiment can also include filtering input unit, and the filtering input is single
Member is set to before the rectification unit, and the filtering input unit may include: the one or two be set in positive input line
Pole pipe, and it is set to the first diode rear end, and be parallel between the positive input line and cathode input line
First input capacitance；The anode of the first diode is power input；In the first diode and first input
Discharge resistance is provided between capacitor；The discharge resistance is connected between the positive input line and the cathode input line.
By the example scheme, the residual voltage in the first input capacitance can be made to discharge rapidly, the influence of residual voltage is dropped to
It is minimum.
6, the resistance value R of the discharge resistance of the utility model embodiment can satisfy: 200-470K Ω；The electric discharge electricity
Resistance can be the Chip-R of 1206 encapsulation.Pass through the example scheme, it can be ensured that electric discharge rapidly, while being avoided to complete machine function
The influence of consumption.
7, the transformer unit of the utility model embodiment may include: primary coil；The primary coil and filter
Wave capacitor, filter resistance and the second Diode series；Wherein, the input terminal of one end of the filter capacitor and the primary coil
It is connected, the anode of second diode is connected with the output end of the primary coil.By the example scheme, may be implemented
Further improving Switching Power Supply generation by adjusting primary coil spike absorption circuit filtering parameter (such as filter resistance)
Noise.
It will appreciated by the skilled person that whole or certain steps, system, dress in method disclosed hereinabove
Functional module/unit in setting may be implemented as software, firmware, hardware and its combination appropriate.In hardware embodiment,
Division between the functional module/unit referred in the above description not necessarily corresponds to the division of physical assemblies；For example, one
Physical assemblies can have multiple functions or a function or step and can be executed by several physical assemblies cooperations.Certain groups
Part or all components may be implemented as by processor, such as the software that digital signal processor or microprocessor execute, or by
It is embodied as hardware, or is implemented as integrated circuit, such as specific integrated circuit.Such software can be distributed in computer-readable
On medium, computer-readable medium may include computer storage medium (or non-transitory medium) and communication media (or temporarily
Property medium).As known to a person of ordinary skill in the art, term computer storage medium is included in for storing information (such as
Computer readable instructions, data structure, program module or other data) any method or technique in the volatibility implemented and non-
Volatibility, removable and nonremovable medium.Computer storage medium include but is not limited to RAM, ROM, EEPROM, flash memory or its
His memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storages, magnetic holder, tape, disk storage or other
Magnetic memory apparatus or any other medium that can be used for storing desired information and can be accessed by a computer.This
Outside, known to a person of ordinary skill in the art to be, communication media generally comprises computer readable instructions, data structure, program mould
Other data in the modulated data signal of block or such as carrier wave or other transmission mechanisms etc, and may include any information
Delivery media.
Claims (10)
1. a kind of control circuit of food processor, including Switching Power Supply, which is characterized in that the Switching Power Supply includes successively phase
Rectification unit, transformer unit and power output unit even, the power output unit include for exporting the first power supply
The first output unit of VDD1, and the second output unit for exporting second source VDD2；The first output unit packet
With including light current GND, second output unit and the transformer unit include forceful electric power ground SGND；First power supply is less than institute
Second source is stated, the difference of first power supply and the second source is greater than 5V；
Wherein, the first Y capacitance GND and the forceful electric power in the light current is provided between SGND.
2. the control circuit of food processor according to claim 1, which is characterized in that the first power vd D1 and institute
The first load resistance is connected between GND with stating light current；
The second source VDD2 and the forceful electric power the second load resistance is connected between SGND.
3. the control circuit of food processor according to claim 1, which is characterized in that
The capacitance C1 of first Y capacitance meets: 0.1nF≤C1≤0.3nF.
4. the control circuit of food processor according to claim 2, which is characterized in that
The resistance value of first load resistance and second load resistance is all satisfied: less than or it is equal to 5K Ω.
5. the control circuit of food processor according to claim 1, which is characterized in that the Switching Power Supply further includes filter
Wave input unit, the filtering input unit are set to before the rectification unit, and the filtering input unit includes: to be set to
First diode in positive input line, and it is set to the first diode rear end, and be parallel to the anode input
The first input capacitance between line and cathode input line；The anode of the first diode is power input；
Discharge resistance is provided between the first diode and first input capacitance；The discharge resistance is connected to institute
It states between positive input line and the cathode input line.
6. the control circuit of food processor according to claim 5, which is characterized in that the resistance value R of the discharge resistance
Meet: 200-470K Ω；The discharge resistance is the Chip-R of 1206 encapsulation.
7. the control circuit of food processor according to claim 1, which is characterized in that the transformer unit includes:
Primary coil；
The primary coil and filter capacitor, filter resistance and the second Diode series；Wherein, one end of the filter capacitor with
The input terminal of the primary coil is connected, and the anode of second diode is connected with the output end of the primary coil.
8. the control circuit of food processor according to claim 7, which is characterized in that the resistance value of the filter resistance is full
Foot: 47 Ω to 100 Ω.
9. the control circuit of food processor according to claim 1, which is characterized in that the control circuit further includes setting
The electromagnetic compatibility EMC module being placed between the Switching Power Supply and mains supply interface；
The EMC module includes: the second Y capacitance being connected between firewire and ground and the third being connected between zero curve and ground
Y capacitance；
The capacitance of second Y capacitance and the third Y capacitance is all satisfied: 1.0nF to 2.2nF.
10. the control circuit of food processor according to claim 9, which is characterized in that the control circuit further includes
Power supply control chip；The power supply control chip is connected with the rectification unit and the transformer unit respectively；
Switching device is provided in the power supply control chip, the switching device is that Metal-Oxide Semiconductor field-effect is brilliant
Body pipe MOSFET；
Wherein, the pressure voltage of the MOSFET is at least 650V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821961703.0U CN209105030U (en) | 2018-11-27 | 2018-11-27 | A kind of control circuit of food processor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021050630A1 (en) * | 2019-09-10 | 2021-03-18 | Texas Instruments Incorporated | Active y-rated capacitor control options for common-mode electromagnetic interference (emi) reduction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021050630A1 (en) * | 2019-09-10 | 2021-03-18 | Texas Instruments Incorporated | Active y-rated capacitor control options for common-mode electromagnetic interference (emi) reduction |
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Effective date of registration: 20230605 Address after: Building 2, No. 52, 22nd Street, Baiyang Street, Qiantang New District, Hangzhou City, Zhejiang Province, 310000 Patentee after: Hangzhou Jiuchuang Home Appliances Co.,Ltd. Address before: No. 999, Mei Li Road, Huaiyin District, Ji'nan, Shandong Patentee before: JOYOUNG Co.,Ltd. |