CN107750066A - A kind of defrosting device and method - Google Patents
A kind of defrosting device and method Download PDFInfo
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- CN107750066A CN107750066A CN201711089224.4A CN201711089224A CN107750066A CN 107750066 A CN107750066 A CN 107750066A CN 201711089224 A CN201711089224 A CN 201711089224A CN 107750066 A CN107750066 A CN 107750066A
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- heating tube
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
Abstract
The invention provides a kind of defrosting device and method, the defrosting device includes：Rectification filtering module, control module, electric heating tube, energy-storage module, switching tube and sampling resistor；Rectification filtering module is connected with AC network and electric heating tube respectively, and electric heating tube, switching tube and sampling resistor are sequentially connected in series, and energy-storage module is connected with electric heating tube；Rectification filtering module is used to the alternating current of AC network input being converted to direct current, and by DC power transmission to electric heating tube；Control module is used for the sampled voltage for gathering sampling resistor both ends, according to the dutycycle of sampled voltage adjusting switch pipe, so that the electric current on sampling resistor is located in default domain of walker；Energy-storage module is used to be stored according to the electric current progress electric energy on sampling resistor, so that the electric current on electric heating tube is located in domain of walker；Electric heating tube is used to be generated heat to carry out defrost processing to evaporator using the electric energy received.This programme can improve the security that defrost is carried out to evaporator.
Description
Technical field
The present invention relates to electrical engineering technical field, more particularly to a kind of defrosting device and method.
Background technology
During the use of refrigerator and air-conditioning, vapor, which runs into the relatively low evaporator of temperature, can condense into frost, with fortune
The frosting of the extension evaporator surface of row time constantly thickens, and the refrigerating efficiency of the thicker evaporator of frosting is lower.Therefore, evaporating
The frosting on device surface reaches after certain thickness, it is necessary to carry out defrost processing to evaporator.
At present, in order to carry out defrost to evaporator, electric heating tube is set beside evaporator, and electric heating tube utilizes electricity
The alternating current heating of net input, will condense in the frost melts of evaporator surface, reaches the purpose of defrost.
Electric heating tube is purely resistive part, its power output and alternating voltage it is square directly proportional, because line voltage is deposited
Fluctuating, the power output of electric heating tube changes with the lifting of line voltage, when electric heating tube power output compared with
High temperature caused by big may burn the part closed on, the damage of electrical equipment where causing evaporator, or even be also possible to trigger fire
Calamity.Therefore, the existing method security using electric heating tube progress defrost is relatively low.
The content of the invention
The embodiments of the invention provide a kind of defrosting device and method, it is possible to increase the safety of defrost is carried out to evaporator
Property.
In a first aspect, the embodiments of the invention provide a kind of defrosting device, applied to the household appliances including evaporator, bag
Include：Rectification filtering module, control module, electric heating tube, energy-storage module, switching tube and sampling resistor；
The rectification filtering module is connected with AC network and the electric heating tube respectively, the electric heating tube, described opens
Sampling resistor is sequentially connected in series described in Guan Guanhe, and the sampling resistor ground connection, the energy-storage module is connected with the electric heating tube, institute
Control module is stated with the switching tube to be connected；
The rectification filtering module, the alternating current for the AC network to be inputted are converted to direct current, and by described in
DC power transmission gives the electric heating tube；
The control module, for gathering the sampled voltage at the sampling resistor both ends, adjusted according to the sampled voltage
The dutycycle of the switching tube, so that the electric current on the sampling resistor is located in default domain of walker；
The energy-storage module, stored for carrying out electric energy according to the electric current on the sampling resistor, so that the electrical heating
Electric current on pipe is located in the domain of walker；
The electric heating tube, for being generated heat using the electric energy received, to carry out defrost processing to the evaporator.
Alternatively,
The energy-storage module includes：Energy storage inductor and the first diode；
The energy storage inductor is connected between the electric heating tube and the switching tube；
The positive pole of first diode is connected with the current output terminal of the energy storage inductor, and first diode is born
Pole is connected with the current input terminal of the electric heating tube；
The energy storage inductor, for storing electric energy when the electric current on the sampling resistor reduces to reduce the electrical heating
Electric current on pipe, and electric energy is discharged to increase the electricity on the electric heating tube in the electric current increase on the sampling resistor
Stream, so that the electric current on the electric heating tube is located in the domain of walker.
Alternatively,
The energy-storage module further comprises：First storage capacitor；
The negative pole of first storage capacitor is connected with the current output terminal of the electric heating tube, first storage capacitor
Positive pole be connected with the current input terminal of the electric heating tube.
Alternatively,
The rectification filtering module includes：Second diode, the 3rd diode, the 4th diode, the 5th diode and
Two storage capacitors；
The plus earth of 4th diode, the positive pole phase of the negative pole and second diode of the 4th diode
Even, the negative pole of second diode is connected with the current input terminal of the electric heating tube；
The plus earth of 5th diode, the positive pole phase of the negative pole and the 3rd diode of the 5th diode
Even, the negative pole of the 3rd diode is connected with the current input terminal of the electric heating tube；
The negative pole ground connection of second storage capacitor, the positive pole of second storage capacitor and the electric current of the electric heating tube
Input is connected；
The positive pole of second diode is connected with the live wire of the AC network, the positive pole of the 3rd diode and institute
The zero line for stating AC network is connected.
Alternatively,
The control module includes：Integrated circuit, the first electric capacity, first resistor, second resistance and 3rd resistor；
The power pin of the integrated circuit is connected with the dc source of outside, one end and the electricity of first electric capacity
Source capsule pin is connected, the other end ground connection of first electric capacity；
The ground pin ground connection of the integrated circuit；
The output pin of the integrated circuit is connected with one end of the first resistor, the other end of the first resistor with
The control pole of the switching tube is connected；
The one end of first input pin of the integrated circuit respectively with the second resistance and the 3rd resistor is connected,
The other end of the second resistance is connected with the current output terminal of the electric heating tube, the other end of the 3rd resistor with it is described
The current input terminal of sampling resistor is connected；
The integrated circuit, for sample voltage value and the default normal voltage that will be inputted from first input pin
Value contrast, if the sample voltage value is less than the standard voltage value, passes through control of the output pin to the switching tube
Pole processed sends boost instruction, to increase the dutycycle of the switching tube, if the sample voltage value is more than the normal voltage
Value, step-down instruction is sent to the control pole of the switching tube by the output pin, to reduce the dutycycle of the switching tube.
Alternatively,
The control module further comprises：Second electric capacity and the 4th resistance；
The filtering pin of the integrated circuit is connected with one end of the 4th resistance, the other end of the 4th resistance with
One end of second electric capacity is connected, and the other end of second electric capacity is connected with the current input terminal of the switching tube；
The integrated circuit, it is further used for according to the magnitude of voltage from the filtering pin input, to the sampled voltage
Value is filtered processing.
Alternatively,
The control module further comprises：5th resistance and the 6th resistance；
One end of 5th resistance is connected with the second input pin of the integrated circuit, the 5th resistance it is another
End is connected with the current output terminal of the electric heating tube；
One end of 6th resistance is connected with second input pin, the other end ground connection of the 6th resistance；
The integrated circuit, it is further used for being more than default protection in the magnitude of voltage inputted from second input pin
After magnitude of voltage, open command is sent to the control pole of the switching tube by the output pin, so that the switching tube disconnects
Connection between the electric heating tube and the sampling resistor.
Second aspect, the embodiment of the present invention are additionally provided a kind of any one defrosting device provided using first aspect and entered
The method of row defrost, applied to the household appliances including evaporator, including：
The alternating current that AC network inputs is converted into direct current using the rectification filtering module, and by the direct current
It is transferred to the electric heating tube；
The sampled voltage at the sampling resistor both ends is gathered by the control module, and is adjusted according to the sampled voltage
The dutycycle of the switching tube, so that the electric current on the sampling resistor is located in default domain of walker；
Using the energy-storage module, electric energy is carried out according to the electric current on the sampling resistor and stored, so that the heating tube
On electric current be located in the domain of walker；
The heat sent using the electric heating tube carries out defrost processing to the evaporator.
Alternatively, when the energy-storage module includes energy storage inductor,
The electric current according on the sampling resistor carries out electric energy and stored, including：
Using the energy storage inductor, electric energy is stored to reduce the electrical heating when the electric current on the sampling resistor reduces
Electric current on pipe, electric energy is discharged to increase the electric current on the electric heating tube in the electric current increase on the sampling resistor, with
The electric current on the electric heating tube is set to be located in the domain of walker.
Alternatively, when the control module includes integrated circuit,
The dutycycle that the switching tube is adjusted according to the sampled voltage, including：
Using the integrated circuit, by the sample voltage value inputted from first input pin and default normal voltage
Value contrast, if the sample voltage value is less than the standard voltage value, passes through control of the output pin to the switching tube
Pole processed sends boost instruction, to increase the dutycycle of the switching tube, if the sample voltage value is more than the normal voltage
Value, step-down instruction is sent to the control pole of the switching tube by the output pin, to reduce the dutycycle of the switching tube.
Alternating current is converted to DC power transmission by defrosting device provided in an embodiment of the present invention and method, rectification filtering module
After electric heating tube, the sampled voltage at control module collection sampling resistor both ends, according to the duty of sampled voltage adjusting switch pipe
Than so that the electric current on sampling resistor is stable in default domain of walker, and energy-storage module enters according to the electric current on sampling resistor
Row storing up electricity or electric discharge, so that the electric current on electric current and sampling resistor on electric heating tube is stable in identical domain of walker,
Electric heating tube heat caused by carries out defrost processing to evaporator.So, by gathering the sampling at sampling resistor both ends
Voltage, the electric current on electric heating tube is stable in certain domain of walker, ensure that electric heating tube has stable power output,
Ac grid voltage fluctuation is avoided to cause electric heating tube power output is excessive to cause household appliances to damage or trigger fire, so as to
It is enough that the security that defrost is carried out to evaporator is provided.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of schematic diagram for defrosting device that one embodiment of the invention provides；
Fig. 2 is a kind of schematic diagram for defrosting device including energy storage inductor that one embodiment of the invention provides；
Fig. 3 is a kind of schematic diagram for defrosting device including the first storage capacitor that one embodiment of the invention provides；
Fig. 4 is a kind of schematic diagram for defrosting device including the second storage capacitor that one embodiment of the invention provides；
Fig. 5 is a kind of schematic diagram for defrosting device including integrated circuit that one embodiment of the invention provides；
Fig. 6 is the schematic diagram for the defrosting device that the another kind that one embodiment of the invention provides includes integrated circuit；
Fig. 7 is the schematic diagram for the defrosting device that another that one embodiment of the invention provides includes integrated circuit；
Fig. 8 is a kind of flow chart for defrosting method that one embodiment of the invention provides.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments, based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
As shown in figure 1, the embodiments of the invention provide a kind of defrosting device, applied to the household appliances including evaporator,
The device can include：Rectification filtering module 101, control module 102, electric heating tube 103, energy-storage module 104, switching tube 105
With sampling resistor 106；
Rectification filtering module 101 is connected with AC network and electric heating tube 103 respectively, electric heating tube 103, switching tube 105
It is sequentially connected in series with sampling resistor 106, and sampling resistor 106 is grounded；
Energy-storage module 104 is connected with electric heating tube 103, and control module 102 is connected with switching tube 105；
Rectification filtering module 101 is used to the alternating current of AC network input being converted to direct current, and straight by what is changed out
Voltage heat pipe 103 is defeated by stream fax；
Control module 102 is used for the sampled voltage for gathering the both ends of sampling resistor 106, according to sampled voltage adjusting switch pipe
105 dutycycle, so that the electric current on sampling resistor 106 is located in default domain of walker；
Energy-storage module 104 is used to be stored according to the electric current progress electric energy on sampling resistor 106, so that on electric heating tube 103
Electric current be located in default domain of walker；
Electric heating tube 103 is used to be generated heat using the electric energy received, to carry out defrost processing to evaporator.
The embodiments of the invention provide a kind of defrosting device, rectification filtering module by alternating current be converted to DC power transmission to
After electric heating tube, the sampled voltage at control module collection sampling resistor both ends, according to the dutycycle of sampled voltage adjusting switch pipe,
So that the electric current on sampling resistor is stable in default domain of walker, energy-storage module is stored up according to the electric current on sampling resistor
Electricity discharges, so that the electric current on the electric current and sampling resistor on electric heating tube is stable in identical domain of walker, electricity adds
Heat pipe heat caused by carries out defrost processing to evaporator.So, by gathering the sampled voltage at sampling resistor both ends,
Electric current on electric heating tube is stable in certain domain of walker, ensure that electric heating tube has stable power output, avoid
Ac grid voltage fluctuation causes electric heating tube power output is excessive to cause household appliances to damage or trigger fire, so as to carry
Security for carrying out defrost to evaporator.
Alternatively, on the basis of defrosting device shown in Fig. 1, as shown in Fig. 2 energy-storage module 104 can include energy storage electricity
Feel L and the first diode D1；
Energy storage inductor L is connected between electric heating tube RT and switching tube Q, the first diode D1 positive pole and energy storage inductor L
Current output terminal be connected, the first diode D1 negative pole is connected with electric heating tube RT current input terminal.
Because energy storage inductor L is connected between electric heating tube RT and switching tube Q, when the accounting for switching tube Q of control module 102
After sky is than turning down, the electric current on sampling resistor RX reduces, and energy storage inductor L progressively discharges the electric energy of storage, so that electric heating tube
Electric current on RT is gradually reduced, until identical with the electric current on sampling resistor RX；When control module 102 is by switching tube Q duty
After tuning up, the electric current increase on sampling resistor RX, energy storage inductor L progressively stores electric energy, so that the electricity on electric heating tube RT
Stream gradually increase, until identical with the electric current on collection resistance RX.
Control module is according to the dutycycle of the sampled voltage adjusting switch pipe at sampling resistor both ends so that on sampling resistor
Electric current is maintained in a domain of walker, and energy storage inductor carries out corresponding storing up electricity or electric discharge according to the electric current on sampling resistor,
So that the electric current on electric heating tube maintain with sampling resistor in electric current identical domain of walker.So, when AC network is defeated
When entering the voltage pulsation to the alternating current of rectification filtering module, the electric current on electric heating tube maintains controllable domain of walker all the time
It is interior, prevent that the power output of electric heating tube is excessive or too small, avoid electric heating tube power output is too small from causing defrost incomplete
And the excessive situation for causing household appliances to damage of electric heating tube power output occurs.
Energy storage inductor L current output terminal is connected with electric heating tube RT current input terminal by the first diode D1
Connect, when rectification filtering module 101 normally transmits direct current to electric heating tube RT, the first diode D1 is in reversely cut-off shape
State, ensure that the direct current that rectification filtering module 101 exports can be transferred to electric heating tube RT, stop in rectification filtering module 101
When transmitting direct current to electric heating tube RT, the first diode D1 is in forward conduction state, energy storage inductor L, the first diode D1
Loop is formed with electric heating tube RT, electric heating tube RT falls the power consumption stored in energy storage inductor L.So, on the one hand can be with
The utilization rate of electric energy is improved, energy storage inductor long-time storing up electricity influences energy storage electricity when on the other hand can avoid the electric heating tube from not working
The performance of sense.
Alternatively, on the basis of defrosting device shown in Fig. 2, as shown in figure 3, energy-storage module 104 can also include first
Storage capacitor E1；
First storage capacitor E1 negative pole is connected with electric heating tube RT current output terminal, the first storage capacitor E1 positive pole
It is connected with electric heating tube RT current input terminal.
First storage capacitor is in parallel with electric heating tube, when rectification filtering module inputs to the electricity of the direct current of electric heating tube
The first storage capacitor charges during pressure rise, when the voltage that rectification filtering module inputs to the direct current of electric heating tube reduces by first
Storage capacitor discharges, so as to reduce the ripple that rectification filtering module inputs to the direct current of electric heating tube and included so that
Input to that the direct current of electric heating tube is more steady, so as to so that the power output of electric heating tube is more stable.
Alternatively, on the basis of defrosting device shown in Fig. 1, as shown in figure 4, rectification filtering module 101 can include：The
Two diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the second storage capacitor E2；
4th diode D4 plus earth, the 4th diode D4 negative pole are connected with the second diode D2 positive pole, the
Two diode D2 negative pole is connected with electric heating tube RT current input terminal；
5th diode D5 plus earth, the 5th diode D5 negative pole are connected with the 3rd diode D3 positive pole, the
Three diode D3 negative pole is connected with electric heating tube RT current input terminal；
Second storage capacitor E2 negative pole ground connection, the second storage capacitor E2 positive pole and electric heating tube RT current input terminal
It is connected；
Second diode D2 positive pole is connected with the live wire ACL of AC network, the 3rd diode D3 positive pole and alternating current
The zero line ACN of net is connected.
The live wire of AC network is connected between the second diode and the 4th diode being serially connected, and the zero of AC network
Line is connected between the 3rd diode and the 5th diode being serially connected, and is realized and is converted to the alternating current of AC network input
Direct current.Second storage capacitor can be filtered processing before by DC power transmission to electric heating tube to direct current, reduce
The fluctuation of direct current.
The alternating current of AC network is converted to by direct current by rectification filtering module, because direct current is relative to alternating current
It is more steady, electric heating tube heating is carried out defrost to electric heating tube DC power transmission, the output work of electric heating tube can be made
Rate is more steady, and utility electric heating tube carries out the security of defrost to evaporator.
Alternatively, in Fig. 1 to 4 on the basis of any shown defrosting device, as shown in figure 5, control module 102 can wrap
Include：Integrated circuit U, the first electric capacity C1, first resistor R1, second resistance R2 and 3rd resistor R3；
Integrated circuit U power pin Vcc is connected with the dc source VCC of outside, the first electric capacity C1 one end and power supply
Pin Vcc is connected, the first electric capacity C1 other end ground connection；
Integrated circuit U ground pin GND ground connection；
Integrated circuit U output pin DRV is connected with first resistor R1 one end, first resistor R1 another list and switch
Pipe Q control pole is connected；
The one end of first input pin CS of integrated circuit respectively with second resistance R2 and 3rd resistor R3 is connected, the second electricity
The resistance R2 other end is connected with electric heating tube RT current output terminal, the 3rd resistor R3 other end and sampling resistor RX electric current
Input is connected；
Integrated circuit U will be got after the first input pin CS gets the sample voltage value at sampling resistor RX both ends
Sample voltage value compared with standard voltage value set in advance.If sample voltage value is less than standard voltage value, lead to
Cross output pin DRV and send boost instruction, increase switching tube Q dutycycle, so as to increase sampling electricity to switching tube Q control pole
Hinder the electric current on RX；If sample voltage value is more than standard electric source value, the control pole by output pin DRV to switching tube Q
Step-down instruction is sent, reduces switching tube Q dutycycle, so as to reduce the electric current on sampling resistor RX.
Integrated circuit acquisition is to after the sample voltage value at sampling resistor both ends, by the sample voltage value got with setting in advance
Fixed standard voltage value is compared, because sampling resistor is connected with electric heating tube, if sample voltage value is less than normal voltage
Value, illustrates that the electric current on electric heating tube is less than normalized current, and now integrated circuit sends boost instruction to the control pole of switching tube,
Increase the dutycycle of switching tube, so as to improve the electric current on sampling resistor, energy storage inductor after the electric current increase on sampling resistor
Start to discharge so that the electric current on electric heating tube increases to reduce the gap between normalized current；If sampled voltage is more than
Standard voltage value, illustrate that electric current is more than normalized current on electric heating tube, now integrated circuit sends drop to the control pole of switching tube
Pressure instruction, makes the dutycycle of switching tube reduce, so as to reduce the electric current on sampling resistor, is stored up after the electric current reduction on sampling resistor
Energy inductance starts storing up electricity so that the electric current on electric heating tube reduces to reduce the gap between normalized current.
Integrated circuit is according to the sampled voltage at sampling resistor both ends come the dutycycle of adjusting switch pipe so that on sampling resistor
Electric current maintain a specific domain of walker, i.e., the difference between electric current and normalized current on sampling resistor is less than default
Threshold value, energy storage inductor carry out corresponding storing up electricity or electric discharge according to the electric current on sampling resistor, the electric current on electric heating tube is also tieed up
Hold in specific domain of walker, i.e., the difference between electric current and normalized current on electric heating tube is less than predetermined threshold value, realizes
The stabilization of electric current on electric heating tube, it is achieved thereby that the stabilization of electric heating tube power output.By setting domain of walker, make electricity
The stable output power of heating tube is in safety and is capable of the level of effective defrost, ensures electric heating tube can be effectively to evaporator
Carry out that there is reliable security while defrost.
Alternatively, on the basis of defrosting device shown in Fig. 5, as shown in fig. 6, control module 102 can also include：Second
Electric capacity C2 and the 4th resistance R4；
Integrated circuit U filtering pin ZCD is connected with the 4th resistance R4 one end, the 4th resistance R4 other end and second
Electric capacity C2 one end is connected, and the second electric capacity C2 other end is connected with switching tube Q current input terminal；
Integrated circuit U is used for according to the magnitude of voltage from filtering pin ZCD inputs, to being adopted from the first input pin CS inputs
Sample magnitude of voltage is filtered processing.
Disturbed by signal inside or outside household appliances, the voltage signal that integrated circuit is got from the first input pin
In the presence of some harmonic waves, judgement of the harmonic wave meeting interference sample integrated circuit to sample voltage value, in order to ensure that integrated circuit being capable of root
Corresponding instruction is sent to switching tube exactly according to sample voltage value, integrated circuit can be according to the voltage inputted from filtering pin
Value is filtered processing to the sample voltage value inputted from the first input pin, ensure that integrated circuit can be controlled out accurately
The dutycycle of pipe is closed, so that the electric current on electric heating tube maintains steady state value, so as to ensure that electric heating tube has stabilization
Power output, prevent that electric heating tube power output is excessive and household appliances are caused to damage.
Alternatively, on the basis of defrosting device shown in Fig. 5, as shown in fig. 7, control module 102 can also include：5th
Resistance R5 and the 6th resistance R6；
5th resistance R5 one end is connected with integrated resistor U the second input pin FB, the 5th resistance R5 other end with
Electric heating tube RT current output terminal is connected；
6th resistance R6 one end is connected with the second input pin FB, the 6th resistance R6 other end ground connection；
Integrated circuit U is further used for the magnitude of voltage that will be inputted from the second input pin FB and protection voltage set in advance
Value is compared, if from the second input pin FB input magnitude of voltage be more than protection magnitude of voltage, by output pin DRV to
Switching tube Q control pole sends open command so that the connection between switching tube Q-switch electric heating tube RT and sampling resistor RX.
The voltage at integrated circuit acquisition electric heating tube both ends, by the magnitude of voltage collected and protection magnitude of voltage set in advance
Contrasted, if the magnitude of voltage collected has exceeded protection magnitude of voltage, illustrate that the voltage pulsation of alternating current has been over out
The adjustable range of pipe is closed, integrated circuit further can not reduce the electricity on electric heating tube by the dutycycle of controlling switch pipe
Flow, now integrated circuit sends open command to the control pole of switching tube, disconnects switching tube and stops powering to electric heating tube, and one
Aspect can prevent electric heating tube from being damaged due to high current, on the other hand can prevent electric heating tube caloric value from excessively causing house
Electric product burns.
It should be noted that in above-mentioned each embodiment, switching tube can be metal-oxide-semiconductor, can also be IGBT
(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), specifically can be clever according to the actual requirements
Selection living.
The defrosting device can apply to the household appliances that refrigerator, air-conditioning etc. include evaporator, for receiving use
The triggering at family carries out defrost processing to evaporator automatically according to default program.
As shown in figure 8, the embodiment of the present invention additionally provides a kind of any one change provided using above-mentioned each embodiment
The method that white device carries out defrost, applied to the household appliances including evaporator, this method may comprise steps of：
Step 801：The alternating current that AC network inputs is converted into direct current using rectification filtering module, and by direct current
It is transferred to electric heating tube；
Step 802：The sampled voltage at sampling resistor both ends is gathered by control module, and according to sampled voltage adjusting switch
The dutycycle of pipe, so that the electric current on sampling resistor is located in default domain of walker；
Step 803：Using energy-storage module, electric energy is carried out according to the electric current on sampling resistor and stored, so that in heating tube
Electric current is located in domain of walker；
Step 804：The heat sent using electric heating tube carries out defrost processing to evaporator.
Alternatively, as shown in any in Fig. 2 to 7, when energy-storage module includes energy storage inductor,
When step 803 is stored according to the electric current progress electric energy on sampling resistor in Fig. 8, it can sampled using energy storage inductor
Electric energy is stored when ohmically electric current reduces to reduce the electric current on electric heating tube, is discharged in the electric current increase on sampling resistor
Electric energy is to increase the electric current on electric heating tube, so that the electric current on electric heating tube is located in domain of walker.
Alternatively, as shown in any in Fig. 5 to 7, when control module includes integrated circuit,
, can will be from first using integrated circuit when step 802 is according to the dutycycle of sampled voltage adjusting switch pipe in Fig. 8
The sample voltage value of input pin input contrasts with default standard voltage value, if sample voltage value is less than standard voltage value,
Boost instruction is sent to the control pole of switching tube by output pin, to increase the dutycycle of switching tube, if sample voltage value
More than standard voltage value, step-down instruction is sent to the control pole of switching tube by output pin, to reduce the dutycycle of switching tube.
It should be noted that the content that each step includes in the above method, due to being based on apparatus of the present invention embodiment
Same design, particular content can be found in the narration in apparatus of the present invention embodiment, and here is omitted.
In summary, the defrosting device and method that each embodiment of the present invention provides, at least have the advantages that：
1st, in embodiments of the present invention, after alternating current is converted to DC power transmission to electric heating tube by rectification filtering module,
The sampled voltage at control module collection sampling resistor both ends, according to the dutycycle of sampled voltage adjusting switch pipe so that sampling electricity
Electric current in resistance is stable in default domain of walker, and energy-storage module carries out storing up electricity or electric discharge according to the electric current on sampling resistor,
So that the electric current on electric current and sampling resistor on electric heating tube is stable in identical domain of walker, electric heating tube utilizes institute
Caused heat carries out defrost processing to evaporator.So, by gathering the sampled voltage at sampling resistor both ends, by electric heating tube
On electric current it is stable in certain domain of walker, ensure that electric heating tube has stable power output, avoid AC network electric
Pressure fluctuation causes electric heating tube power output is excessive to cause household appliances to damage or trigger fire, so as to provide to evaporator
Carry out the security of defrost.
2nd, in embodiments of the present invention, control module is according to the duty of the sampled voltage adjusting switch pipe at sampling resistor both ends
Than so that the electric current on sampling resistor is maintained in a domain of walker, and energy storage inductor enters according to the electric current on sampling resistor
The corresponding storing up electricity of row or electric discharge so that the electric current on electric heating tube maintains and electric current identical domain of walker on sampling resistor
It is interior.So, when AC network inputs to the voltage pulsation of the alternating current of rectification filtering module, the electric current on electric heating tube is all the time
Maintain in controllable domain of walker, prevent that the power output of electric heating tube is excessive or too small, avoid electric heating tube output work
Rate is too small to cause defrost not exclusively and the excessive situation for causing household appliances to damage of electric heating tube power output occurs.
3rd, in embodiments of the present invention, it is the first storage capacitor is in parallel with electric heating tube, when rectification filtering module inputs to
The first storage capacitor charges during the voltage rise of the direct current of electric heating tube, when rectification filtering module inputs to the straight of electric heating tube
The first storage capacitor discharges when the voltage of stream electricity reduces, so as to reduce the direct current that rectification filtering module inputs to electric heating tube
The ripple that electricity includes so that input to that the direct current of electric heating tube is more steady, so as to so that the output work of electric heating tube
Rate is more stable.
4th, in embodiments of the present invention, the voltage at integrated circuit acquisition electric heating tube both ends, by the magnitude of voltage collected with
Protection magnitude of voltage set in advance is contrasted, if the magnitude of voltage collected has exceeded protection magnitude of voltage, illustrates alternating current
Voltage pulsation has been over the adjustable range of switching tube, integrated circuit can not further by the dutycycle of controlling switch pipe come
The electric current on electric heating tube is reduced, now integrated circuit sends open command to the control pole of switching tube, disconnects switching tube and stops
Only powered to electric heating tube, on the one hand can prevent electric heating tube from being damaged due to high current, on the other hand can prevent electricity from adding
Heat pipe caloric value excessively causes household appliances to burn.
It should be noted that herein, such as first and second etc relational terms are used merely to an entity
Or operation makes a distinction with another entity or operation, and not necessarily require or imply and exist between these entities or operation
Any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant be intended to it is non-
It is exclusive to include, so that process, method, article or equipment including a series of elements not only include those key elements,
But also the other element including being not expressly set out, or also include solid by this process, method, article or equipment
Some key elements.In the absence of more restrictions, the key element limited by sentence " including one ", is not arranged
Except other identical factor in the process including the key element, method, article or equipment being also present.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
Programmed instruction related hardware is completed, and foregoing program can be stored in computer-readable storage medium, the program
Upon execution, the step of execution includes above method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
It is last it should be noted that：Presently preferred embodiments of the present invention is the foregoing is only, is merely to illustrate the skill of the present invention
Art scheme, is not intended to limit the scope of the present invention.Any modification for being made within the spirit and principles of the invention,
Equivalent substitution, improvement etc., are all contained in protection scope of the present invention.
Claims (10)
- A kind of 1. defrosting device, applied to the household appliances including evaporator, it is characterised in that including：Rectification filtering module, control Molding block, electric heating tube, energy-storage module, switching tube and sampling resistor；The rectification filtering module is connected with AC network and the electric heating tube respectively, the electric heating tube, the switching tube It is sequentially connected in series with the sampling resistor, the sampling resistor ground connection, the energy-storage module is connected with the electric heating tube, the control Molding block is connected with the switching tube；The rectification filtering module, the alternating current for the AC network to be inputted are converted to direct current, and by the direct current The electric heating tube is defeated by fax；The control module, for gathering the sampled voltage at the sampling resistor both ends, according to sampled voltage regulation The dutycycle of switching tube, so that the electric current on the sampling resistor is located in default domain of walker；The energy-storage module, stored for carrying out electric energy according to the electric current on the sampling resistor, so that on the electric heating tube Electric current be located in the domain of walker；The electric heating tube, for being generated heat using the electric energy received, to carry out defrost processing to the evaporator.
- 2. defrosting device according to claim 1, it is characterised in that the energy-storage module includes：Energy storage inductor and the one or two Pole pipe；The energy storage inductor is connected between the electric heating tube and the switching tube；The positive pole of first diode is connected with the current output terminal of the energy storage inductor, the negative pole of first diode with The current input terminal of the electric heating tube is connected；The energy storage inductor, for storing electric energy when the electric current on the sampling resistor reduces to reduce the electric heating tube Electric current, and on the sampling resistor electric current increase when discharge electric energy to increase the electric current on the electric heating tube, with The electric current on the electric heating tube is set to be located in the domain of walker.
- 3. defrosting device according to claim 2, it is characterised in that the energy-storage module further comprises：First energy storage Electric capacity；The negative pole of first storage capacitor is connected with the current output terminal of the electric heating tube, and first storage capacitor is just Pole is connected with the current input terminal of the electric heating tube.
- 4. defrosting device according to claim 1, it is characterised in that the rectification filtering module includes：Second diode, 3rd diode, the 4th diode, the 5th diode and the second storage capacitor；The plus earth of 4th diode, the negative pole of the 4th diode are connected with the positive pole of second diode, The negative pole of second diode is connected with the current input terminal of the electric heating tube；The plus earth of 5th diode, the negative pole of the 5th diode are connected with the positive pole of the 3rd diode, The negative pole of 3rd diode is connected with the current input terminal of the electric heating tube；The negative pole ground connection of second storage capacitor, the positive pole of second storage capacitor input with the electric current of the electric heating tube End is connected；The positive pole of second diode is connected with the live wire of the AC network, positive pole and the friendship of the 3rd diode The zero line of stream power network is connected.
- 5. according to any described defrosting device in Claims 1-4, it is characterised in that the control module includes：Integrated electricity Road, the first electric capacity, first resistor, second resistance and 3rd resistor；The power pin of the integrated circuit is connected with the dc source of outside, one end of first electric capacity and the power supply pipe Pin is connected, the other end ground connection of first electric capacity；The ground pin ground connection of the integrated circuit；The output pin of the integrated circuit is connected with one end of the first resistor, the other end of the first resistor with it is described The control pole of switching tube is connected；The one end of first input pin of the integrated circuit respectively with the second resistance and the 3rd resistor is connected, described The other end of second resistance is connected with the current output terminal of the electric heating tube, the other end of the 3rd resistor and the sampling The current input terminal of resistance is connected；The integrated circuit, for sample voltage value and the default standard voltage value pair that will be inputted from first input pin Than if the sample voltage value is less than the standard voltage value, the control pole by the output pin to the switching tube Boost instruction is sent, to increase the dutycycle of the switching tube, if the sample voltage value is more than the standard voltage value, is led to Cross the output pin and send step-down instruction to the control pole of the switching tube, to reduce the dutycycle of the switching tube.
- 6. defrosting device according to claim 5, it is characterised in that the control module further comprises：Second electric capacity With the 4th resistance；The filtering pin of the integrated circuit is connected with one end of the 4th resistance, the other end of the 4th resistance with it is described One end of second electric capacity is connected, and the other end of second electric capacity is connected with the current input terminal of the switching tube；The integrated circuit, it is further used for, according to the magnitude of voltage from the filtering pin input, entering the sample voltage value Row filtering process.
- 7. defrosting device according to claim 5, it is characterised in that the control module further comprises：5th resistance With the 6th resistance；One end of 5th resistance is connected with the second input pin of the integrated circuit, the other end of the 5th resistance with The current output terminal of the electric heating tube is connected；One end of 6th resistance is connected with second input pin, the other end ground connection of the 6th resistance；The integrated circuit, it is further used for being more than default protection voltage in the magnitude of voltage inputted from second input pin After value, open command is sent to the control pole of the switching tube by the output pin, so that described in switching tube disconnection Connection between electric heating tube and the sampling resistor.
- 8. it is a kind of using the method that any defrosting device carries out defrost in claim 1 to 7, applied to including evaporator Household appliances, it is characterised in that including：The alternating current that AC network inputs is converted into direct current using the rectification filtering module, and by the DC power transmission To the electric heating tube；The sampled voltage at the sampling resistor both ends is gathered by the control module, and according to sampled voltage regulation The dutycycle of switching tube, so that the electric current on the sampling resistor is located in default domain of walker；Using the energy-storage module, electric energy is carried out according to the electric current on the sampling resistor and stored, so that in the heating tube Electric current is located in the domain of walker；The heat sent using the electric heating tube carries out defrost processing to the evaporator.
- 9. defrosting method according to claim 8, it is characterised in that when the energy-storage module includes energy storage inductor,The electric current according on the sampling resistor carries out electric energy and stored, including：Using the energy storage inductor, electric energy is stored to reduce on the electric heating tube when the electric current on the sampling resistor reduces Electric current, on the sampling resistor electric current increase when discharge electric energy to increase the electric current on the electric heating tube so that institute The electric current stated on electric heating tube is located in the domain of walker.
- 10. defrosting method according to claim 8 or claim 9, it is characterised in that when the control module includes integrated circuit When,The dutycycle that the switching tube is adjusted according to the sampled voltage, including：Using the integrated circuit, by the sample voltage value inputted from first input pin and default standard voltage value pair Than if the sample voltage value is less than the standard voltage value, the control pole by the output pin to the switching tube Boost instruction is sent, to increase the dutycycle of the switching tube, if the sample voltage value is more than the standard voltage value, is led to Cross the output pin and send step-down instruction to the control pole of the switching tube, to reduce the dutycycle of the switching tube.
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| CN201711089224.4A CN107750066B (en) | 2017-11-08 | 2017-11-08 | Defrosting device and method |
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| CN201711089224.4A CN107750066B (en) | 2017-11-08 | 2017-11-08 | Defrosting device and method |
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| CN107750066B (en) | 2020-05-26 |
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