CN108075631A - Household electrical appliance and its pressure relief device - Google Patents
Household electrical appliance and its pressure relief device Download PDFInfo
- Publication number
- CN108075631A CN108075631A CN201611036148.6A CN201611036148A CN108075631A CN 108075631 A CN108075631 A CN 108075631A CN 201611036148 A CN201611036148 A CN 201611036148A CN 108075631 A CN108075631 A CN 108075631A
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- voltage
- electrical appliance
- power supply
- household electrical
- wind turbine
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of household electrical appliance and its pressure relief device, which includes：Voltage detection module is connected with power supply, is used to detect the voltage of power supply, and generates trigger signal according to the voltage of power supply, wherein, power supply is used to power for household electrical appliance；Wind turbine drive module is connected with the wind turbine of household electrical appliance, is used to that wind turbine to be driven to operate or shut down；Chip is controlled, is connected with voltage detection module and wind turbine drive module, is used to by wind turbine drive module wind turbine operating preset time be controlled to release to carry out voltage when the voltage for judging power supply according to trigger signal exceeds predetermined voltage range.The pressure relief device of the embodiment of the present invention to household electrical appliance by carrying out outage detection, and wind turbine operating is controlled to accelerate to release the high-voltage signal being stored on household electrical appliance circuit board when power is off, rapid leadage circuit residual voltage, it prevents residual voltage from being damaged to the personal safety of user, improves the security of product.
Description
Technical field
The present invention relates to household electrical appliance technical field, the pressure relief device and a kind of household electric of more particularly to a kind of household electrical appliance
Device.
Background technology
In the related art, in order to avoid polluting external electrical network, household electrical appliance are typically designed with large bulk capacitance and inductance
The EMC protection circuitry for being connected in parallel on ac power input end of composition.But correlation technique has the drawback that, when extraction family expenses
During the socket power-off of electric appliance, due to the presence of big capacitance capacitance, household electrical appliance can be retained in by being stored in the high pressure at capacitance both ends
, it is necessary to which several seconds even tens of seconds can just release to safe voltage on plug, there are security risks.
Therefore, correlation technique needs are improved.
The content of the invention
It is contemplated that it solves at least some of the technical problems in related technologies.For this purpose, the present invention
One purpose is to propose a kind of pressure relief device of household electrical appliance, the device can rapid leadage circuit when power is off residue electricity
Pressure.
It is another object of the present invention to propose a kind of household electrical appliance.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of pressure relief device of household electrical appliance, the family
Electrical appliance includes wind turbine, and described device includes：Voltage detection module, the voltage detection module is connected with power supply, described
Voltage detection module is used to detect the voltage of the power supply, and generates trigger signal according to the voltage of the power supply,
Wherein, the power supply is used to power for the household electrical appliance；Wind turbine drive module, the wind turbine drive module and household electric
The wind turbine of device is connected, and the wind turbine drive module is used to that wind turbine to be driven to operate or shut down；Control chip, the control chip
It is connected with the voltage detection module and the wind turbine drive module, the control chip is used to sentence according to the trigger signal
By the wind turbine drive module wind turbine is controlled to operate in advance when the voltage of the disconnected power supply exceeds predetermined voltage range
If the time is released with carrying out voltage.
The pressure relief device of the household electrical appliance proposed according to embodiments of the present invention, voltage detection module detect the electricity of power supply
It presses and trigger signal is generated according to the voltage of power supply, control module judges that the voltage of power supply exceeds according to trigger signal
By wind turbine drive module wind turbine is controlled to operate preset time during predetermined voltage range to release to carry out voltage.It is of the invention as a result,
The pressure relief device of embodiment is by carrying out household electrical appliance outage detection, and when power is off by controlling wind turbine operating to accelerate to let out
Leave with high-voltage signal of the storage on household electrical appliance circuit board, can in hundreds of milliseconds by residual voltage release to safe voltage with
Under, it prevents residual voltage from being damaged to the personal safety of user, improves the security of product.
According to one embodiment of present invention, the upper limit separation of the predetermined voltage range can be 260V, described default
The lower limit separation of voltage range can be 160V.
According to one embodiment of present invention, the voltage detection module includes：Voltage sampling circuit, the voltage sample
Circuit is connected with the power supply, and the voltage sampling circuit is used to generate voltage sample according to the voltage of the power supply
Signal；Voltage conversion circuit, the voltage conversion circuit are connected with the voltage sampling circuit, and the voltage conversion circuit is used for
Transformation processing is carried out to the voltage sampling signal；Trigger circuit, the trigger circuit are connected with the voltage conversion circuit, institute
Trigger circuit is stated for generating trigger signal according to the voltage sampling signal after transformation.
According to one embodiment of present invention, the voltage sampling circuit includes：Rectification unit, the rectification unit it is defeated
Enter end with the power supply to be connected, the rectification unit is used to carry out rectification to the alternating current that the power supply provides；Point
Press unit, the input terminal of the partial pressure unit is connected with the output terminal of the rectification unit, the output terminal of the partial pressure unit and
The voltage conversion circuit is connected, and the partial pressure unit is used to that the alternating current after rectification to be divided to generate the voltage to adopt
Sample signal.
According to one embodiment of present invention, the rectification unit includes：First diode, the sun of first diode
Pole is connected with the first end of the power supply；Second diode, anode and the power supply of second diode
Second end is connected, and the cathode of second diode is connected with the cathode of first diode and has first node, described
First node is connected with the input terminal of the partial pressure unit.
According to one embodiment of present invention, the partial pressure unit includes：The first resistor that is sequentially connected in series, second resistance and
3rd resistor, one end of the first resistor are connected with the first node, one end of the second resistance and the described first electricity
The other end of resistance is connected, and one end of the 3rd resistor is connected with the other end of the second resistance and has section point, institute
The other end ground connection of 3rd resistor is stated, the section point is connected with the voltage conversion circuit.
According to one embodiment of present invention, the partial pressure unit further includes：First capacitance, first capacitance with it is described
3rd resistor is in parallel；Electrolytic capacitor, the electrolytic capacitor are in parallel with first capacitance.
According to one embodiment of present invention, the voltage conversion circuit includes：Operational amplifier；4th resistance, it is described
One end ground connection of 4th resistance, the other end of the 4th resistance are connected with the negative input end of the operational amplifier；5th electricity
Resistance, one end of the 5th resistance are connected with the voltage sampling circuit, and the other end of the 5th resistance is put with the computing
The positive input terminal of big device is connected；6th resistance, one end of the 6th resistance are connected with the positive input terminal of the operational amplifier,
The other end of 6th resistance is connected with the output terminal of the operational amplifier, the output terminal of the operational amplifier with it is described
Trigger circuit is connected；Second capacitance, one end of second capacitance are connected with the positive input terminal of the operational amplifier, and described
The other end ground connection of two capacitances.
According to one embodiment of present invention, the trigger circuit include 555 timers, the first of 555 timer
Foot is grounded, and the crus secunda of 555 timer is connected after being connected with the 6th foot with the voltage conversion circuit, and described 555 periodically
3rd foot of device is connected with the control chip, the 4th foot of 555 timer be connected with octal after with it is first default electric
Source is connected, and the 7th foot of 555 timer is connected by the 7th resistance with the second predeterminated voltage.
According to one embodiment of present invention, the control chip is when the trigger signal is in rising edge or trailing edge
Judge that the voltage of the power supply exceeds the predetermined voltage range.
In order to achieve the above objectives, a kind of household electrical appliance that another aspect of the present invention embodiment proposes, including the embodiment
Household electrical appliance pressure relief device.
The household electrical appliance proposed according to embodiments of the present invention, by the pressure relief device of above-mentioned household electrical appliance, to household electrical appliance
Outage detection is carried out, and when power is off by the way that wind turbine operating is controlled to accelerate to release the high pressure being stored on household electrical appliance circuit board
Signal can release residual voltage to safe voltage in hundreds of milliseconds, prevent residual voltage from pacifying to the person of user
It damages entirely, improves the security of product.
Description of the drawings
Fig. 1 is the block diagram of the pressure relief device of household electrical appliance according to embodiments of the present invention；
Fig. 2 is the circuit diagram of the pressure relief device of household electrical appliance according to an embodiment of the invention；
Fig. 3 is the circuit diagram of the pressure relief device of the household electrical appliance of a specific embodiment according to the present invention；And
Fig. 4 is the block diagram of household electrical appliance according to an embodiment of the invention.
Reference numeral：
Voltage detection module 100, wind turbine drive module 200 and control chip 300；
The pressure relief device 400 of household electrical appliance；Household electrical appliance 500；Wind turbine 600；Power supply 700；
Voltage sampling circuit 10, voltage conversion circuit 20 and trigger circuit 30；
Rectification unit 101 and partial pressure unit 102；
First diode D1 and the second diode D2；
First resistor R1, second resistance R2 and 3rd resistor R3；
First capacitance C1 and electrolytic capacitor C10；
Operational amplifier 201, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second capacitance C2；
555 timers 301；7th resistance R7；Filter circuit 210 and triode Q1.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition household electrical appliance and its pressure relief device.
Fig. 1 is the block diagram of the pressure relief device of household electrical appliance according to embodiments of the present invention.As shown in Figure 1, family expenses
Electric appliance includes wind turbine 600, and the pressure relief device 400 of the household electrical appliance includes：Voltage detection module 100,200 and of wind turbine drive module
Control chip 300.
Wherein, voltage detection module 100 is connected with power supply 700, and voltage detection module 100 is used to detect power supply
700 voltage, and trigger signal is generated according to the voltage of power supply 700, wherein, power supply 700 is used for as household electrical appliance
Power supply；Wind turbine drive module 200 is connected with the wind turbine 600 of household electrical appliance, and wind turbine drive module 200 is used to that wind turbine 600 to be driven to transport
Turn or shut down；Control chip 300 is connected respectively with voltage detection module 100 and wind turbine drive module 200, controls chip
300 are used for when the voltage that power supply 700 is judged according to trigger signal exceeds predetermined voltage range through wind turbine drive module
200 control wind turbines 600 operate preset time and are released with carrying out voltage.
It should be noted that when extracting the socket of household electrical appliance, voltage detection module 100 detects power supply 700
Voltage undergo mutation, i.e., the voltage of power supply 700 exceed predetermined voltage range.
A specific embodiment according to the present invention, the upper limit separation of predetermined voltage range can be 260V, predeterminated voltage
The lower limit separation of scope can be 160V.It should be appreciated that when household electrical appliance work normally, the voltage of power supply 700
Can be 200V to 240V, when the voltage of power supply 700 is increased to more than 260V suddenly, control chip 300 judges power supply electricity
Source 700 jumps power down；When the voltage of power supply 700 is reduced to below 160V suddenly, control chip 300 judges power supply
700 bust power down.
Specifically, voltage detection module 100 can detect the voltage of power supply 700 in real time, and according to the electricity detected
Pressure generates trigger signal and exports the trigger signal of generation to control chip 300.If voltage detection module 100 generates
The level of trigger signal remain unchanged and for example keep high level or low level, control chip 300 then judges power supply 700
Voltage does not power off without departing from predetermined voltage range, power supply 700, at this point, control chip 300 sends shut-off control letter
Number, by wind turbine drive module 200 wind turbine 600 to be driven to shut down.If the trigger signal that voltage detection module 100 generates
It overturns, control chip 300 then judges the voltage of power supply 700 beyond predetermined voltage range such as power supply 700
Voltage is reduced to below lower limit separation 160V or is increased to more than upper limit separation 260V suddenly, power supply 700 suddenly
It powers off, at this point, control chip 300 sends and opens control signal, by wind turbine drive module 200 wind turbine 600 to be controlled to open
It opens, and wind turbine 600 is controlled to operate preset time such as 1s, so as to which residual voltage is released to safety within hundreds of milliseconds of time
Below voltage.The pressure relief device of the household electrical appliance of the embodiment of the present invention can have the power-off behavior of household electrical appliance as a result,
The detection of effect ground, and wind turbine operating is controlled in the down circuitry of household electrical appliance, to accelerate to release to be stored in the circuit of household electrical appliance
Residual voltage can be released to below safe voltage by the high-voltage signal on plate within hundreds of milliseconds of time, prevent remaining electricity
Pressure damages the personal safety of user, improves the security of product.
According to one embodiment of present invention, as shown in Fig. 2, voltage detection module 100 includes：Voltage sampling circuit 10,
Voltage conversion circuit 20 and trigger circuit 30, wherein, voltage sampling circuit 10 is connected with power supply 700, voltage sampling circuit
10 are used to generate voltage sampling signal according to the voltage of power supply 700；Voltage conversion circuit 20 and 10 phase of voltage sampling circuit
Even, voltage conversion circuit 20 is used to carry out transformation processing to voltage sampling signal；Trigger circuit 30 and 20 phase of voltage conversion circuit
Even, trigger circuit 30 is used to generate trigger signal according to the voltage sampling signal after transformation.
According to one embodiment of present invention, as shown in Fig. 2, voltage sampling circuit 10 includes：Rectification unit 101 and partial pressure
Unit 102, wherein, the input terminal of rectification unit 101 is connected with power supply 700, and rectification unit 101 is used for power supply
700 alternating currents provided carry out rectification；The input terminal of partial pressure unit 102 is connected with the output terminal of rectification unit 101, partial pressure unit
102 output terminal is connected with voltage conversion circuit 20, and partial pressure unit 102 is used to that the alternating current after rectification to be divided to generate
Voltage sampling signal.
According to one embodiment of present invention, as shown in Fig. 2, rectification unit 101 includes：First diode D1 and the two or two
Pole pipe D2, wherein, the anode of the first diode D1 is connected with the first end AC1 of power supply 700；The anode of second diode D2
It is connected with the second end AC2 of power supply 700, the cathode of the second diode D2 is connected and has with the cathode of the first diode D1
First node, first node are connected with the input terminal of partial pressure unit 102.
According to one embodiment of present invention, as shown in Fig. 2, partial pressure unit 102 includes：The first resistor being sequentially connected in series
R1, second resistance R2 and 3rd resistor R3, one end of first resistor R1 are connected with first node, one end of second resistance R2 and the
The other end of one resistance R1 is connected, and one end of 3rd resistor R3 is connected with the other end of second resistance R2 and has a section point,
The other end ground connection GND of 3rd resistor R3, section point are connected with voltage conversion circuit 20.
According to one embodiment of present invention, as shown in Fig. 2, partial pressure unit 102 further includes：First capacitance C1 and electrolysis electricity
Hold C10, wherein, the first capacitance C1 is in parallel with 3rd resistor R3；Electrolytic capacitor C10 is in parallel with the first capacitance C1, electrolytic capacitor C10
Anode be connected with section point, the cathode of electrolytic capacitor C10 ground connection.
Specifically, voltage sampling circuit 10 is mainly using electric resistance partial pressure, the method for capacitance voltage stabilizing to power supply 700
Voltage is sampled, and the alternating current that power supply 700 provides exports d. c. voltage signal after 101 rectification of rectification unit, should
The voltage value of d. c. voltage signal is Vdc.And then the first resistor R1, the second resistance R2 that are connected in series in partial pressure unit 102 and
3rd resistor R3 divides d. c. voltage signal, the voltage V1=Vdc*R3/ (R1+R2+R3) at 3rd resistor R3 both ends, the
The voltage at 3rd resistor R3 both ends is filtered one capacitance C1 and electrolytic capacitor C10 and voltage stabilizing processing, and will be at filtering voltage regulation
Voltage sampling signal after reason is exported to voltage conversion circuit 20.
According to one embodiment of present invention, as shown in Fig. 2, voltage conversion circuit 20 includes：Operational amplifier 201,
Four resistance R4, the 5th resistance R5, the 6th resistance R6 and the second capacitance C2, wherein, one end ground connection of the 4th resistance R4, the 4th resistance
The other end of R4 is connected with the negative input end of operational amplifier 201；One end of 5th resistance R5 is connected with voltage sampling circuit 10,
The other end of 5th resistance R5 is connected with the positive input terminal of operational amplifier 201；One end of 6th resistance R6 and operational amplifier
201 positive input terminal is connected, and the other end of the 6th resistance R6 is connected with the output terminal of operational amplifier 201, operational amplifier 201
Output terminal be connected with trigger circuit 30；One end of second capacitance C2 is connected with the positive input terminal of operational amplifier 201, the second electricity
Hold the other end ground connection GND of C2.
Specifically, the 5th resistance R5 and the second capacitance C2 the composition RC filter circuits of voltage conversion circuit 20, voltage become
Circuit 20 is changed after voltage sampling signal is received, voltage sampling signal is filtered, and filtered voltage sample is believed
The positive amplifying circuit that number output is formed to operational amplifier 201, wherein, the magnification ratio of operational amplifier 201 is Av=1+
R6/R5, operational amplifier 201 are amplified voltage sampling signal processing, and the voltage sampling signal after enhanced processing is defeated
Go out to trigger circuit 30.
According to one embodiment of present invention, as shown in Fig. 2, trigger circuit 30 includes 555 timer, 301,555 timer
301 the first foot 1 is grounded, and the crus secunda 2 of 555 timers 301 is connected with the 6th foot 6 to be connected afterwards with voltage conversion circuit 20, and 555
3rd foot 3 of timer 301 is connected with control chip 300, and the 4th foot 4 of 555 timers 301 is connected afterwards and the with octal 8
One default power supply VCC1 is connected, and the 7th foot 7 of 555 timers 301 is connected by the 7th resistance R7 with the second predeterminated voltage VCC2.
Specifically, 555 timers 301 may make up Schmidt trigger, according to the characteristics of 555 timer, trigger circuit
30 have upper limit threshold voltage VT+With lower threshold voltage VT-, wherein,Work as trigger circuit
The voltage value of 30 input signal is from less than upper limit threshold voltage VT+It is mutated more than upper limit threshold voltage VT+Or from higher than under
Limit threshold voltage VT-It is mutated less than lower threshold voltage VT-When, the trigger signal that trigger circuit 30 generates is overturn.
In an embodiment of the present invention, when the voltage stabilization of power supply 700 is in the range of 200V to 240V, household electric
Device works normally, if the voltage of power supply 700 is reduced to suddenly below the lower limit separation 160V of predetermined voltage range, control
Coremaking piece 300 then judges that 700 bust outage condition of power supply is set up；If the voltage of power supply 700 is increased to pre- suddenly
If more than the upper limit separation 260V of voltage range, control chip 300 then judge power supply 700 jump outage condition establishment.
In this way, voltage conversion circuit 20 can be used for the voltage difference of matching voltage sampled signal and the hysteresis voltage of Schmidt trigger
Relation between (difference i.e. between upper limit threshold voltage and lower threshold voltage), so that the upper limit threshold electricity of trigger circuit 30
Press VT+The upper limit separation such as 260V of corresponding predetermined voltage range, and make the lower threshold voltage V of trigger circuit 30T- corresponding
The lower limit separation such as 160V of predetermined voltage range.
In one particular embodiment of the present invention, it is assumed that voltage sampling circuit 10 uses+5V to be carried out as reference voltage
Partial pressure sampling, by taking a certain dividing ratios as an example, the concrete operating principle of the protective device of the embodiment of the present invention is as follows：
When the voltage value for the alternating current that power supply 700 provides is 160V, the voltage that voltage sampling circuit 10 generates is adopted
The AD sampled values of sample signal are V160(hexadecimal number), corresponding decimal number are M1；When the exchange that power supply 700 provides
When the voltage value of electricity is 260V, the AD sampled values for the voltage sampling signal that voltage sampling circuit 10 generates are V260(hexadecimal
Number), corresponding decimal number be M2, the corresponding voltage difference P=5* (M2-M1)/255 of the two.It is formed according to 555 timers
The operation principle of Schmidt trigger, the upper limit threshold voltage of trigger circuit 30Lower threshold voltageHysteresis voltage isIn an embodiment of the present invention, the voltage value of the first default power supply VCC1 is+5V,
The hysteresis voltage of trigger circuit 30 isTherefore, it is necessary to adjust the magnification ratio of voltage conversion circuit 20, with
Ratio between the voltage difference of voltage sampling signal and the hysteresis voltage of trigger circuit 30 that are generated with voltage sampling circuit 10
Relation, wherein, the magnification ratio Av=1.67/P of the operational amplifier 201 of voltage conversion circuit 20.
Further, according to the characteristics of 555 timer 301, voltage sampling signal after transformation is from 555 timers 301
Crus secunda 2 input, and the voltage value of the voltage sampling signal after transformation from less thanIt is mutated and is more thanWhen,
The 3rd foot 3 output trailing edge trigger signal of 555 timers 301；Voltage sampling signal after transformation is from 555 timers 301
Crus secunda 2 input, and the voltage value of the voltage sampling signal after transformation from higher thanIt is mutated and is less thanWhen,
The 3rd foot 3 output rising edge trigger signal of 555 timers 301.In this way, it is dropped when the voltage of power supply 700 reduces
When breaking electricity, the voltage sampling signal that voltage sampling circuit 10 generates drops to low pressure from high pressure, and voltage conversion circuit 20 is to electricity
Sampled signal is pressed to carry out transformation processing, if the voltage value of the voltage sampling signal after transformation reaches lower threshold voltage VT-I.e.The trigger signal that then trigger circuit 30 generates is overturn, and generates a rising edge signal；When power supply 700
Voltage rise i.e. occur boosting power-off when, voltage sampling circuit 10 generate voltage sampling signal rise to high pressure from low pressure,
Voltage conversion circuit 20 carries out transformation processing to voltage sampling signal, if the voltage value of the voltage sampling signal after transformation reaches
Upper limit threshold voltage VT+I.e.The trigger signal that then trigger circuit 30 generates is overturn, and generates a trailing edge letter
Number.
In one particular embodiment of the present invention, according to overturning point difference, set rational predetermined voltage range with
And the trigger point of rational Schmidt trigger, and the magnification ratio of voltage conversion circuit 20 is adjusted, so that predetermined voltage range
Upper limit separation such as 260V corresponding voltages value beTrailing edge overturning point；And make under predetermined voltage range
Limiting separation such as 160V corresponding voltages value isRising edge overturning point.In this way, trigger circuit 30 can basis
Voltage detection signal generation trigger signal after transformation.
According to one embodiment of present invention, control chip 300 judges when trigger signal is in rising edge or trailing edge
The voltage of power supply 700 exceeds predetermined voltage range.
Specifically, control chip 300 is the core of electromagnetic heating system, and control chip 300 opens control for exporting
Signal or shut-off control signal are to wind turbine drive module 200, by wind turbine drive module 200 wind turbine 600 to be driven to operate or stop
Only operate.In an embodiment of the present invention, set and control the external interrupt type of chip 300 as two-way edging trigger i.e. rising edge
It is triggered with trailing edge, when the trigger signal that trigger circuit 30 generates is lasting high level or low level, control chip 300 is sentenced
The circuit of disconnected household electrical appliance does not power off, and exports shut-off control signal to wind turbine drive module 200, so that wind turbine drives mould
Block 200 drives wind turbine 600 to shut down；When the trigger signal that trigger circuit 30 generates is in rising edge or trailing edge, control
Chip 300 judges that the circuit of household electrical appliance powers off, and exports and open control signal to wind turbine drive module 200, so that wind
Machine drive module 200 drives wind turbine operating preset time such as 1s, to be released to residual voltage within hundreds of milliseconds of time
Below safe voltage.
According to one embodiment of present invention, as shown in figure 3, wind turbine drive module 200 includes：Filter circuit 210 and three
Pole pipe Q1, wherein, filter circuit 210 is used to be filtered the control signal that control chip 300 exports, and then triode
Q1 is switched on or off according to filtered control signal, wind turbine 600 to be controlled to operate or shut down the voltage at both ends.In this hair
In bright embodiment, the input terminal of wind turbine drive module 200 is connected with control chip 300, the output terminal of wind turbine drive module 200
It is connected with wind turbine 600, when the output of chip 300 is controlled to open control signal to wind turbine drive module 200, triode Q1 is open-minded,
The voltage loaded at 600 both ends of wind turbine is the 3rd predeterminated voltage such as 18V, so as to which wind turbine 600 be driven to operate；When control chip
During 300 output shut-off control signal to wind turbine drive module 200, triode Q1 shut-offs, loading the voltage at 600 both ends of wind turbine is
4th predeterminated voltage such as 0V, so as to which wind turbine 600 be driven to shut down.
As described above, the operation principle of the pressure relief device of the household electrical appliance of the embodiment of the present invention is specific as follows：
According to the characteristics of Schmidt trigger, the trigger point of rational sample voltage value and Schmidt trigger is set,
On the basis of the normal working voltage (200V to 240V) of household electrical appliance, voltage detection module 100 detects power supply in real time
700 voltage, and trigger signal is generated according to the variation of voltage sample value.When the voltage of power supply 700 maintains normal work
When making in the range of voltage (200V to 240V), the trigger signal that voltage detection module 100 generates keeps high level or low level；When
When the voltage of power supply 700 is reduced to below the lower limit separation 160V of predetermined voltage range suddenly, Schmidt trigger
The voltage value of input signal reaches lower threshold voltage VT-I.e.Voltage detection module 100 generates rising edge trigger signal；
When the voltage of power supply 700 is increased to more than the upper limit separation 260V of predetermined voltage range suddenly, Schmidt trigger
The voltage value of input signal reach upper limit threshold voltage VT+I.e.Voltage detection module 100 generates trailing edge triggering letter
Number.In an embodiment of the present invention, control chip 300 responds two-way edging trigger signal, that is to say, that control chip 300 exists
After receiving rising edge trigger signal or trailing edge trigger signal, send and open control signal, control wind turbine drive module 200
Triode Q1 open preset time such as 1s, and then chip 300 is controlled to pass through, control wind turbine 600 is forced to operate preset time example
Such as 1s, residual voltage is released to below safe voltage within hundreds of milliseconds of time.
To sum up, the pressure relief device of the household electrical appliance proposed according to embodiments of the present invention, voltage detection module detection power supply electricity
The voltage in source simultaneously generates trigger signal according to the voltage of power supply, and control module judges the electricity of power supply according to trigger signal
By wind turbine drive module wind turbine is controlled to operate preset time when pressure is beyond predetermined voltage range to release to carry out voltage.As a result,
The pressure relief device of the embodiment of the present invention by household electrical appliance carry out outage detection, and when power is off by control wind turbine operating with
Accelerate to release the high-voltage signal being stored on the circuit board of household electrical appliance, residual voltage can be released to peace in hundreds of milliseconds
It below full voltage, prevents residual voltage from being damaged to the personal safety of user, improves the security of product.
Fig. 4 is the block diagram of household electrical appliance according to embodiments of the present invention.As shown in figure 4, the household electrical appliance 500 wrap
Include the pressure relief device 400 of household electrical appliance.
According to one embodiment of present invention, household electrical appliance 500 can be electromagnetic heater, such as electromagnetic oven, electromagnetism electricity
Rice cooker or prevention electromagnetic pressure cooker etc..
To sum up, the household electrical appliance proposed according to embodiments of the present invention, by the pressure relief device of above-mentioned household electrical appliance, to family expenses
Electric appliance carries out outage detection, and when power is off by the way that wind turbine operating is controlled to be stored in accelerate to release on household electrical appliance circuit board
High-voltage signal can release residual voltage to safe voltage in hundreds of milliseconds, prevent people of the residual voltage to user
Body damages safely, improves the security of product.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features contact directly or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments described in this specification or example and different embodiments or exemplary feature
It closes and combines.
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (11)
1. a kind of pressure relief device of household electrical appliance, which is characterized in that the household electrical appliance include wind turbine, and described device includes：
Voltage detection module, the voltage detection module are connected with power supply, and the voltage detection module is described for detecting
The voltage of power supply, and trigger signal is generated according to the voltage of the power supply, wherein, the power supply is used for as institute
State household electrical appliance power supply；
Wind turbine drive module, the wind turbine drive module are connected with the wind turbine of household electrical appliance, and the wind turbine drive module is used to drive
Dynamic wind turbine operating shuts down；
Chip is controlled, the control chip is connected with the voltage detection module and the wind turbine drive module, the control core
Piece is used for when the voltage that the power supply is judged according to the trigger signal exceeds predetermined voltage range through the wind turbine
Drive module controls the wind turbine operating preset time to release to carry out voltage.
2. the pressure relief device of household electrical appliance according to claim 1, which is characterized in that the upper limit of the predetermined voltage range
Separation is 260V, and the lower limit separation of the predetermined voltage range is 160V.
3. the pressure relief device of household electrical appliance according to claim 1 or 2, which is characterized in that the voltage detection module bag
It includes：
Voltage sampling circuit, the voltage sampling circuit are connected with the power supply, and the voltage sampling circuit is used for basis
The voltage generation voltage sampling signal of the power supply；
Voltage conversion circuit, the voltage conversion circuit are connected with the voltage sampling circuit, and the voltage conversion circuit is used for
Transformation processing is carried out to the voltage sampling signal；
Trigger circuit, the trigger circuit are connected with the voltage conversion circuit, after the trigger circuit is used for according to transformation
Voltage sampling signal generates trigger signal.
4. the pressure relief device of household electrical appliance according to claim 3, which is characterized in that the voltage sampling circuit includes：
Rectification unit, the input terminal of the rectification unit are connected with the power supply, and the rectification unit is used for the confession
The alternating current that power supply provides carries out rectification；
Partial pressure unit, the input terminal of the partial pressure unit are connected with the output terminal of the rectification unit, the partial pressure unit it is defeated
Outlet is connected with the voltage conversion circuit, and the partial pressure unit is used to divide with described in generation the alternating current after rectification
Voltage sampling signal.
5. the pressure relief device of household electrical appliance according to claim 4, which is characterized in that the rectification unit includes：
First diode, the anode of first diode are connected with the first end of the power supply；
Second diode, the anode of second diode are connected with the second end of the power supply, second diode
Cathode be connected with the cathode of first diode and there is first node, the first node is defeated with the partial pressure unit
Enter end to be connected.
6. the pressure relief device of household electrical appliance according to claim 5, which is characterized in that the partial pressure unit includes：
First resistor, second resistance and the 3rd resistor being sequentially connected in series, one end of the first resistor and the first node phase
Even, one end of the second resistance is connected with the other end of the first resistor, one end of the 3rd resistor and described second
The other end of resistance is connected and has section point, and the other end of the 3rd resistor is grounded, the section point and the electricity
Pressure translation circuit is connected.
7. the pressure relief device of household electrical appliance according to claim 6, which is characterized in that the partial pressure unit further includes：
First capacitance, first capacitance are in parallel with the 3rd resistor；
Electrolytic capacitor, the electrolytic capacitor are in parallel with first capacitance.
8. the pressure relief device of household electrical appliance according to claim 3, which is characterized in that the voltage conversion circuit includes：
Operational amplifier；
4th resistance, one end ground connection of the 4th resistance, the other end of the 4th resistance and bearing for the operational amplifier
Input terminal is connected；
5th resistance, one end of the 5th resistance are connected with the voltage sampling circuit, the other end of the 5th resistance with
The positive input terminal of the operational amplifier is connected；
6th resistance, one end of the 6th resistance are connected with the positive input terminal of the operational amplifier, the 6th resistance
The other end is connected with the output terminal of the operational amplifier, and the output terminal of the operational amplifier is connected with the trigger circuit；
Second capacitance, one end of second capacitance are connected with the positive input terminal of the operational amplifier, second capacitance
The other end is grounded.
9. the pressure relief device of household electrical appliance according to claim 3, which is characterized in that it is fixed that the trigger circuit includes 555
When device, the first foot ground connection of 555 timer, the crus secunda of 555 timer be connected with the 6th foot after with the voltage
Translation circuit is connected, the 3rd foot of 555 timer with it is described control chip be connected, the 4th foot of 555 timer with
Octal is connected after being connected with the first default power supply, and the 7th foot of 555 timer passes through the 7th resistance and the second default electricity
Pressure is connected.
10. the pressure relief device of household electrical appliance according to claim 9, which is characterized in that the control chip is touched described
Judge that the voltage of the power supply exceeds the predetermined voltage range when signaling in rising edge or trailing edge.
11. a kind of household electrical appliance, which is characterized in that including letting out for the household electrical appliance according to any one of claim 1-10
Pressure device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036148.6A CN108075631B (en) | 2016-11-15 | 2016-11-15 | Household appliance and pressure relief device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036148.6A CN108075631B (en) | 2016-11-15 | 2016-11-15 | Household appliance and pressure relief device thereof |
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| CN108075631A true CN108075631A (en) | 2018-05-25 |
| CN108075631B CN108075631B (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611036148.6A Active CN108075631B (en) | 2016-11-15 | 2016-11-15 | Household appliance and pressure relief device thereof |
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Cited By (1)
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|---|---|---|---|---|
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| CN108075631B (en) | 2020-07-31 |
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