CN107750066B - Defrosting device and method - Google Patents
Defrosting device and method Download PDFInfo
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- CN107750066B CN107750066B CN201711089224.4A CN201711089224A CN107750066B CN 107750066 B CN107750066 B CN 107750066B CN 201711089224 A CN201711089224 A CN 201711089224A CN 107750066 B CN107750066 B CN 107750066B
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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
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Abstract
The invention provides a defrosting device and a defrosting method, wherein the defrosting device comprises: the device comprises a rectification filtering module, a control module, an electric heating pipe, an energy storage module, a switching tube and a sampling resistor; the rectification filtering module is respectively connected with an alternating current power grid and the electric heating pipe, the switching tube and the sampling resistor are sequentially connected in series, and the energy storage module is connected with the electric heating pipe; the rectification filter module is used for converting alternating current input by an alternating current power grid into direct current and transmitting the direct current to the electric heating pipe; the control module is used for collecting sampling voltage at two ends of the sampling resistor and adjusting the duty ratio of the switching tube according to the sampling voltage so as to enable the current on the sampling resistor to be within a preset floating range; the energy storage module is used for storing electric energy according to the current on the sampling resistor so as to enable the current on the electric heating pipe to be within a floating range; the electric heating pipe is used for heating by utilizing the received electric energy so as to defrost the evaporator. This scheme can improve the security of defrosting the evaporimeter.
Description
Technical Field
The invention relates to the technical field of electrical engineering, in particular to a defrosting device and a defrosting method.
Background
In the use process of a refrigerator and an air conditioner, water vapor is condensed into frost when meeting an evaporator with lower temperature, the frost on the surface of the evaporator is continuously thickened along with the extension of the operation time, and the refrigeration efficiency of the evaporator is lower when the frost is thicker. Therefore, after the frost on the surface of the evaporator reaches a certain thickness, the evaporator needs to be subjected to a defrosting treatment.
At present, in order to defrost an evaporator, an electric heating pipe is arranged beside the evaporator, and the electric heating pipe generates heat by using alternating current input by a power grid so as to melt frost condensed on the surface of the evaporator and achieve the purpose of defrosting.
The electric heating pipe is a pure resistive component, the output power of the electric heating pipe is in direct proportion to the square of alternating voltage, the output power of the electric heating pipe changes along with the rise and fall of the voltage of the power grid due to the fluctuation of the voltage of the power grid, and adjacent components can be burnt by high temperature generated when the output power of the electric heating pipe is large, so that an electric appliance where an evaporator is located is damaged, and even a fire disaster can be caused. Therefore, the existing defrosting method by using an electric heating pipe has low safety.
Disclosure of Invention
The embodiment of the invention provides a defrosting device and method, which can improve the safety of defrosting an evaporator.
In a first aspect, an embodiment of the present invention provides a defrosting device applied to an electric appliance product including an evaporator, including: the device comprises a rectification filtering module, a control module, an electric heating pipe, an energy storage module, a switching tube and a sampling resistor;
the rectification filtering module is respectively connected with an alternating current power grid and the electric heating pipe, the switch pipe and the sampling resistor are sequentially connected in series, the sampling resistor is grounded, the energy storage module is connected with the electric heating pipe, and the control module is connected with the switch pipe;
the rectification filtering module is used for converting alternating current input by the alternating current power grid into direct current and transmitting the direct current to the electric heating pipe;
the control module is used for collecting sampling voltages at two ends of the sampling resistor and adjusting the duty ratio of the switching tube according to the sampling voltages so as to enable the current on the sampling resistor to be within a preset floating range;
the energy storage module is used for storing electric energy according to the current on the sampling resistor so as to enable the current on the electric heating pipe to be within the floating range;
and the electric heating pipe is used for heating by utilizing the received electric energy so as to defrost the evaporator.
Alternatively,
the energy storage module includes: an energy storage inductor and a first diode;
the energy storage inductor is connected in series between the electric heating tube and the switching tube;
the anode of the first diode is connected with the current output end of the energy storage inductor, and the cathode of the first diode is connected with the current input end of the electric heating pipe;
the energy storage inductor is used for releasing electric energy to reduce the current on the electric heating pipe when the current on the sampling resistor is reduced, and storing the electric energy to increase the current on the electric heating pipe when the current on the sampling resistor is increased, so that the current on the electric heating pipe is located in the floating range.
Alternatively,
the energy storage module further includes: a first energy storage capacitor;
the negative electrode of the first energy storage capacitor is connected with the current output end of the electric heating tube, and the positive electrode of the first energy storage capacitor is connected with the current input end of the electric heating tube.
Alternatively,
the rectification filtering module comprises: the second diode, the third diode, the fourth diode, the fifth diode and the second energy storage capacitor;
the anode of the fourth diode is grounded, the cathode of the fourth diode is connected with the anode of the second diode, and the cathode of the second diode is connected with the current input end of the electric heating tube;
the anode of the fifth diode is grounded, the cathode of the fifth diode is connected with the anode of the third diode, and the cathode of the third diode is connected with the current input end of the electric heating tube;
the negative electrode of the second energy storage capacitor is grounded, and the positive electrode of the second energy storage capacitor is connected with the current input end of the electric heating pipe;
the positive pole of the second diode is connected with the live wire of the alternating current power grid, and the positive pole of the third diode is connected with the zero line of the alternating current power grid.
Alternatively,
the control module includes: the circuit comprises an integrated circuit, a first capacitor, a first resistor, a second resistor and a third resistor;
a power supply pin of the integrated circuit is connected with an external direct current power supply, one end of the first capacitor is connected with the power supply pin, and the other end of the first capacitor is grounded;
the grounding pin of the integrated circuit is grounded;
an output pin of the integrated circuit is connected with one end of the first resistor, and the other end of the first resistor is connected with a control electrode of the switch tube;
a first input pin of the integrated circuit is respectively connected with one ends of the second resistor and the third resistor, the other end of the second resistor is connected with a current output end of the electric heating tube, and the other end of the third resistor is connected with a current input end of the sampling resistor;
the integrated circuit is used for comparing a sampling voltage value input from the first input pin with a preset standard voltage value, if the sampling voltage value is smaller than the standard voltage value, sending a boosting instruction to a control electrode of the switch tube through the output pin so as to increase the duty ratio of the switch tube, and if the sampling voltage value is larger than the standard voltage value, sending a voltage reduction instruction to the control electrode of the switch tube through the output pin so as to reduce the duty ratio of the switch tube.
Alternatively,
the control module further comprises: a second capacitor and a fourth resistor;
a filter pin of the integrated circuit is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with a current input end of the switch tube;
the integrated circuit is further used for carrying out filtering processing on the sampling voltage value according to the voltage value input from the filtering pin.
Alternatively,
the control module further comprises: a fifth resistor and a sixth resistor;
one end of the fifth resistor is connected with a second input pin of the integrated circuit, and the other end of the fifth resistor is connected with a current output end of the electric heating tube;
one end of the sixth resistor is connected with the second input pin, and the other end of the sixth resistor is grounded;
the integrated circuit is further used for sending a disconnection instruction to a control electrode of the switch tube through the output pin after the voltage value input from the second input pin is larger than a preset protection voltage value, so that the switch tube is disconnected between the electric heating tube and the sampling resistor.
In a second aspect, an embodiment of the present invention further provides a defrosting method using any one of the defrosting apparatuses provided in the first aspect, where the defrosting method is applied to an electric appliance product including an evaporator, and includes:
converting alternating current input by an alternating current power grid into direct current by using the rectification filtering module, and transmitting the direct current to the electric heating pipe;
sampling voltages at two ends of the sampling resistor are collected through the control module, and the duty ratio of the switching tube is adjusted according to the sampling voltages, so that the current on the sampling resistor is located in a preset floating range;
storing electric energy by using the energy storage module according to the current on the sampling resistor so as to enable the current on the heating pipe to be within the floating range;
and defrosting the evaporator by utilizing the heat emitted by the electric heating tube.
Optionally, when the energy storage module comprises an energy storage inductor,
the electric energy is stored according to the current on the sampling resistor, including:
and utilizing the energy storage inductor to release electric energy to reduce the current on the electric heating pipe when the current on the sampling resistor is reduced, and store the electric energy to increase the current on the electric heating pipe when the current on the sampling resistor is increased, so that the current on the electric heating pipe is positioned in the floating range.
Optionally, when the control module comprises an integrated circuit,
the duty cycle of the switching tube is adjusted according to the sampling voltage, and the duty cycle adjusting method comprises the following steps:
the integrated circuit is utilized to compare a sampling voltage value input from the first input pin with a preset standard voltage value, if the sampling voltage value is smaller than the standard voltage value, a boosting instruction is sent to a control electrode of the switch tube through the output pin so as to increase the duty ratio of the switch tube, and if the sampling voltage value is larger than the standard voltage value, a voltage reduction instruction is sent to the control electrode of the switch tube through the output pin so as to reduce the duty ratio of the switch tube.
According to the defrosting device and the defrosting method provided by the embodiment of the invention, after the rectifying and filtering module converts alternating current into direct current and transmits the direct current to the electric heating pipe, the control module collects sampling voltages at two ends of the sampling resistor, the duty ratio of the switching tube is adjusted according to the sampling voltages, so that the current on the sampling resistor is stabilized in a preset floating range, the energy storage module stores or discharges electricity according to the current on the sampling resistor, the current on the electric heating pipe and the current on the sampling resistor are stabilized in the same floating range, and the electric heating pipe performs defrosting treatment on an evaporator by using the generated heat. Like this, through the sampling voltage who gathers sampling resistor both ends, stabilize electric current on the electric heating pipe in certain floating range, guarantee that electric heating pipe has stable output, avoid alternating current network voltage fluctuation to cause electric heating pipe output too big to cause household electrical appliances to damage or cause the conflagration to can provide the security of defrosting the evaporimeter.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a defrosting apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a defrosting apparatus including an energy storage inductor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a defrosting apparatus including a first energy storage capacitor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a defrosting apparatus including a second energy storage capacitor according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a defrosting apparatus including an integrated circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another defrosting apparatus including an integrated circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another defrosting apparatus including an integrated circuit according to an embodiment of the present invention;
fig. 8 is a flowchart of a defrosting method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a defrosting apparatus applied to an electric home appliance including an evaporator, where the apparatus may include: the device comprises a rectification filtering module 101, a control module 102, an electric heating pipe 103, an energy storage module 104, a switching tube 105 and a sampling resistor 106;
the rectification filter module 101 is respectively connected with an alternating current power grid and the electric heating pipe 103, the switching pipe 105 and the sampling resistor 106 are sequentially connected in series, and the sampling resistor 106 is grounded;
the energy storage module 104 is connected with the electric heating pipe 103, and the control module 102 is connected with the switching pipe 105;
the rectification filter module 101 is configured to convert ac power input by an ac power grid into dc power, and transmit the converted dc power to the voltage heat pipe 103;
the control module 102 is configured to collect sampling voltages at two ends of the sampling resistor 106, and adjust a duty ratio of the switching tube 105 according to the sampling voltages, so that a current on the sampling resistor 106 is within a preset floating range;
the energy storage module 104 is configured to store electric energy according to the current on the sampling resistor 106, so that the current on the electric heating tube 103 is within a preset floating range;
the electric heating pipe 103 is used for heating by using the received electric energy so as to defrost the evaporator.
The embodiment of the invention provides a defrosting device, wherein after a rectifying and filtering module converts alternating current into direct current and transmits the direct current to an electric heating pipe, a control module collects sampling voltages at two ends of a sampling resistor, the duty ratio of a switching tube is adjusted according to the sampling voltages, so that the current on the sampling resistor is stabilized in a preset floating range, an energy storage module stores or discharges electricity according to the current on the sampling resistor, the current on the electric heating pipe and the current on the sampling resistor are stabilized in the same floating range, and the electric heating pipe utilizes the generated heat to defrost an evaporator. Like this, through the sampling voltage who gathers sampling resistor both ends, stabilize electric current on the electric heating pipe in certain floating range, guarantee that electric heating pipe has stable output, avoid alternating current network voltage fluctuation to cause electric heating pipe output too big to cause household electrical appliances to damage or cause the conflagration to can provide the security of defrosting the evaporimeter.
Alternatively, on the basis of the defrosting apparatus shown in fig. 1, as shown in fig. 2, the energy storage module 104 may include an energy storage inductor L and a first diode D1;
the energy storage inductor L is connected between the electric heating tube RT and the switch tube Q in series, the anode of the first diode D1 is connected with the current output end of the energy storage inductor L, and the cathode of the first diode D1 is connected with the current input end of the electric heating tube RT.
Because the energy storage inductor L is connected in series between the electric heating tube RT and the switching tube Q, when the control module 102 adjusts the duty ratio of the switching tube Q to be small, the current on the sampling resistor RX decreases, and the energy storage inductor L gradually releases the stored electric energy, so that the current on the electric heating tube RT gradually decreases until the current is the same as the current on the sampling resistor RX; after the control module 102 increases the duty ratio of the switching tube Q, the current on the sampling resistor RX increases, and the energy storage inductor L gradually stores electric energy, so that the current on the electric heating tube RT gradually increases until the current is the same as the current on the sampling resistor RX.
The control module adjusts the duty ratio of the switching tube according to the sampling voltage at two ends of the sampling resistor, so that the current on the sampling resistor is maintained in a floating range, and the energy storage inductor performs corresponding electricity storage or discharge according to the current on the sampling resistor, so that the current on the electric heating tube is maintained in the floating range which is the same as the current on the sampling resistor. Therefore, when the voltage of alternating current input to the rectifying and filtering module by the alternating current grid fluctuates, the current on the electric heating pipe is always maintained in a controllable floating range, the over-large or over-small output power of the electric heating pipe is prevented, and the situations that the defrosting is incomplete and the electric heating pipe has over-large output power to damage household appliances are avoided.
The current output end of the energy storage inductor L is connected with the current input end of the electric heating tube RT through the first diode D1, when the rectifier filter module 101 normally transmits direct current to the electric heating tube RT, the first diode D1 is in a reverse cut-off state, the direct current output by the rectifier filter module 101 can be ensured to be transmitted to the electric heating tube RT, when the rectifier filter module 101 stops transmitting the direct current to the electric heating tube RT, the first diode D1 is in a forward conduction state, the energy storage inductor L, the first diode D1 and the electric heating tube RT form a loop, and the electric heating tube RT consumes the electric energy stored in the energy storage inductor L. Like this, on the one hand can improve the utilization ratio of electric energy, and on the other hand can avoid electric heating pipe out of work when the long-time electricity storage of energy storage inductance influences the performance of energy storage inductance.
Optionally, on the basis of the defrosting apparatus shown in fig. 2, as shown in fig. 3, the energy storage module 104 may further include a first energy storage capacitor E1;
the negative electrode of the first energy-storage capacitor E1 is connected with the current output end of the electric heating tube RT, and the positive electrode of the first energy-storage capacitor E1 is connected with the current input end of the electric heating tube RT.
The first energy storage capacitor is connected with the electric heating pipe in parallel, the first energy storage capacitor is charged when the voltage of the direct current input to the electric heating pipe by the rectifier and filter module rises, and the first energy storage capacitor is discharged when the voltage of the direct current input to the electric heating pipe by the rectifier and filter module decreases, so that ripples contained in the direct current input to the electric heating pipe by the rectifier and filter module can be reduced, the direct current input to the electric heating pipe is more stable, and the output power of the electric heating pipe can be more stable.
Alternatively, on the basis of the defrosting apparatus shown in fig. 1, as shown in fig. 4, the rectifying and filtering module 101 may include: a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a second energy storage capacitor E2;
the anode of the fourth diode D4 is grounded, the cathode of the fourth diode D4 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is connected with the current input end of the electric heating tube RT;
the anode of the fifth diode D5 is grounded, the cathode of the fifth diode D5 is connected with the anode of the third diode D3, and the cathode of the third diode D3 is connected with the current input end of the electric heating tube RT;
the negative electrode of the second energy-storage capacitor E2 is grounded, and the positive electrode of the second energy-storage capacitor E2 is connected with the current input end of the electric heating tube RT;
the anode of the second diode D2 is connected to the live line ACL of the ac power supply system, and the anode of the third diode D3 is connected to the neutral line ACN of the ac power supply system.
The live wire of the alternating current power grid is connected between the second diode and the fourth diode which are connected in series, and the zero line of the alternating current power grid is connected between the third diode and the fifth diode which are connected in series, so that alternating current input by the alternating current power grid is converted into direct current. The second energy storage capacitor can filter the direct current before transmitting the direct current to the electric heating pipe, so that the fluctuation of the direct current is reduced.
Alternating current through rectification filter module with alternating current network converts direct current into, because the direct current is more steady for the alternating current, transmits direct current for electric heating pipe makes electric heating pipe generate heat and changes the frost, can make electric heating pipe's output more steady, guarantees to change the security of frost to the evaporimeter with electric heating pipe.
Alternatively, on the basis of the defrosting apparatus shown in any one of fig. 1 to 4, as shown in fig. 5, the control module 102 may include: the circuit comprises an integrated circuit U, a first capacitor C1, a first resistor R1, a second resistor R2 and a third resistor R3;
a power supply pin Vcc of the integrated circuit U is connected with an external direct current power supply VCC, one end of a first capacitor C1 is connected with the power supply pin Vcc, and the other end of the first capacitor C1 is grounded;
a grounding pin GND of the integrated circuit U is grounded;
an output pin DRV of the integrated circuit U is connected with one end of a first resistor R1, and the other end of the first resistor R1 is connected with a control electrode of the switch tube Q;
a first input pin CS of the integrated circuit is respectively connected with one end of a second resistor R2 and one end of a third resistor R3, the other end of the second resistor R2 is connected with a current output end of an electric heating tube RT, and the other end of the third resistor R3 is connected with a current input end of a sampling resistor RX;
after acquiring the sampling voltage value at the two ends of the sampling resistor RX from the first input pin CS, the integrated circuit U compares the acquired sampling voltage value with a preset standard voltage value. If the sampling voltage value is smaller than the standard voltage value, a boosting instruction is sent to a control electrode of the switching tube Q through an output pin DRV, the duty ratio of the switching tube Q is increased, and therefore the current on the sampling resistor RX is increased; if the sampling voltage value is larger than the standard power supply value, a voltage reduction instruction is sent to the control electrode of the switching tube Q through the output pin DRV, the duty ratio of the switching tube Q is reduced, and therefore the current on the sampling resistor RX is reduced.
After the integrated circuit collects the sampling voltage values at two ends of the sampling resistor, the obtained sampling voltage value is compared with a preset standard voltage value, because the sampling resistor is connected with the electric heating pipe in series, if the sampling voltage value is smaller than the standard voltage value, the current on the electric heating pipe is smaller than the standard current, at the moment, the integrated circuit sends a boosting instruction to a control electrode of the switching tube, so that the duty ratio of the switching tube is increased, the current on the sampling resistor is increased, the energy storage inductor starts to store the electricity after the current on the sampling resistor is increased, and the current on the electric heating pipe is increased to reduce the difference between the current on the sampling resistor and the standard current; if the sampling voltage is greater than the standard voltage value, the fact that the current on the electric heating pipe is greater than the standard current is indicated, the integrated circuit sends a voltage reduction instruction to the control electrode of the switching tube at the moment, the duty ratio of the switching tube is reduced, and therefore the current on the sampling resistor is reduced, the energy storage inductor starts to discharge after the current on the sampling resistor is reduced, and the current on the electric heating pipe is reduced so as to reduce the difference between the current on the electric heating pipe and the standard current.
The integrated circuit adjusts the duty ratio of the switching tube according to the sampling voltage at two ends of the sampling resistor, so that the current on the sampling resistor is maintained in a specific floating range, namely the difference value between the current on the sampling resistor and the standard current is smaller than a preset threshold value, the energy storage inductor performs corresponding electricity storage or discharge according to the current on the sampling resistor, so that the current on the electric heating tube is also maintained in the specific floating range, namely the difference value between the current on the electric heating tube and the standard current is smaller than the preset threshold value, the stability of the current on the electric heating tube is realized, and the stability of the output power of the electric heating tube is realized. Through setting up the floating range, make electric heating pipe's output stabilize at the level of safe and can effectively change the frost, guarantee that electric heating pipe has reliable security when can effectively changing the frost to the evaporimeter.
Optionally, on the basis of the defrosting apparatus shown in fig. 5, as shown in fig. 6, the control module 102 may further include: a second capacitor C2 and a fourth resistor R4;
a filter pin ZCD of the integrated circuit U is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with one end of a second capacitor C2, and the other end of the second capacitor C2 is connected with a current input end of a switch tube Q;
the integrated circuit U is configured to perform filtering processing on the sampled voltage value input from the first input pin CS according to the voltage value input from the filter pin ZCD.
The integrated circuit is interfered by internal or external signals of the household appliance, some harmonic waves exist in voltage signals acquired by the integrated circuit from the first input pin, the harmonic waves can interfere judgment of the sampling integrated circuit on sampling voltage values, the integrated circuit can accurately send corresponding instructions to the switch tube according to the sampling voltage values, the integrated circuit can carry out filtering processing on the sampling voltage values input from the first input pin according to the voltage values input from the filter pin, the duty ratio of the switch tube can be accurately controlled by the integrated circuit, current on the electric heating tube is maintained at a constant value, the electric heating tube is ensured to have stable output power, and the electric heating tube is prevented from being damaged by overlarge output power.
Optionally, on the basis of the defrosting apparatus shown in fig. 5, as shown in fig. 7, the control module 102 may further include: a fifth resistor R5 and a sixth resistor R6;
one end of the fifth resistor R5 is connected with the second input pin FB of the integrated resistor U, and the other end of the fifth resistor R5 is connected with the current output end of the electric heating tube RT;
one end of the sixth resistor R6 is connected with the second input pin FB, and the other end of the sixth resistor R6 is grounded;
the integrated circuit U is further configured to compare the voltage value input from the second input pin FB with a preset protection voltage value, and if the voltage value input from the second input pin FB is greater than the protection voltage value, send a disconnection instruction to the control electrode of the switching tube Q through the output pin DRV, so that the switching tube Q switches the connection between the electric heating tube RT and the sampling resistor RX.
The integrated circuit collects the voltage at two ends of the electric heating pipe, the collected voltage value is compared with a preset protection voltage value, if the collected voltage value exceeds the protection voltage value, the voltage fluctuation of the alternating current is proved to exceed the adjusting range of the switch pipe, the integrated circuit can not further reduce the current on the electric heating pipe by controlling the duty ratio of the switch pipe, the integrated circuit sends a disconnection instruction to a control electrode of the switch pipe at the moment, the switch pipe is disconnected to stop supplying power to the electric heating pipe, on one hand, the electric heating pipe can be prevented from being damaged due to the large current, and on the other hand, the household appliance product can be prevented from being burnt due to the excessive heat of the electric heating pipe.
In each of the above embodiments, the switching tube may be a MOS tube, and may also be an IGBT (Insulated Gate Bipolar Transistor), and may be flexibly selected according to actual requirements.
The defrosting device can be applied to household appliances comprising evaporators, such as refrigerators, air conditioners and the like, and is used for automatically defrosting the evaporators after receiving the trigger of a user or according to a preset program.
As shown in fig. 8, an embodiment of the present invention further provides a defrosting method using any one of the defrosting apparatuses provided in the above embodiments, where the defrosting method is applied to an electric household appliance including an evaporator, and the method may include the following steps:
step 801: the rectifier filter module is used for converting alternating current input by an alternating current power grid into direct current and transmitting the direct current to the electric heating pipe;
step 802: sampling voltages at two ends of the sampling resistor are collected through the control module, and the duty ratio of the switching tube is adjusted according to the sampling voltages, so that the current on the sampling resistor is located in a preset floating range;
step 803: storing electric energy by using an energy storage module according to the current on the sampling resistor so as to enable the current on the heating pipe to be in a floating range;
step 804: the evaporator is defrosted by heat emitted by the electric heating tube.
Alternatively, as shown in any of fig. 2 to 7, when the energy storage module includes an energy storage inductor,
in step 803 in fig. 8, when the electric energy is stored according to the current on the sampling resistor, the electric energy can be released by the energy storage inductor when the current on the sampling resistor is decreased to decrease the current on the electric heating tube, and the electric energy can be stored to increase the current on the electric heating tube when the current on the sampling resistor is increased, so that the current on the electric heating tube is within the floating range.
Alternatively, as shown in any of fig. 5 to 7, when the control module comprises an integrated circuit,
in step 802 of fig. 8, when the duty ratio of the switching tube is adjusted according to the sampling voltage, the integrated circuit may be used to compare the sampling voltage value input from the first input pin with a preset standard voltage value, if the sampling voltage value is smaller than the standard voltage value, a step-up command is sent to the control electrode of the switching tube through the output pin to increase the duty ratio of the switching tube, and if the sampling voltage value is larger than the standard voltage value, a step-down command is sent to the control electrode of the switching tube through the output pin to decrease the duty ratio of the switching tube.
It should be noted that, since the contents included in each step in the above method are based on the same concept as the embodiment of the apparatus of the present invention, specific contents may refer to the description in the embodiment of the apparatus of the present invention, and are not described herein again.
In summary, the defrosting apparatus and method provided in each embodiment of the present invention at least have the following beneficial effects:
1. in the embodiment of the invention, after the rectifying and filtering module converts alternating current into direct current and transmits the direct current to the electric heating pipe, the control module collects sampling voltages at two ends of the sampling resistor, the duty ratio of the switching tube is adjusted according to the sampling voltages, so that the current on the sampling resistor is stabilized in a preset floating range, the energy storage module stores or discharges electricity according to the current on the sampling resistor, so that the current on the electric heating pipe and the current on the sampling resistor are stabilized in the same floating range, and the electric heating pipe performs defrosting treatment on an evaporator by using the generated heat. Like this, through the sampling voltage who gathers sampling resistor both ends, stabilize electric current on the electric heating pipe in certain floating range, guarantee that electric heating pipe has stable output, avoid alternating current network voltage fluctuation to cause electric heating pipe output too big to cause household electrical appliances to damage or cause the conflagration to can provide the security of defrosting the evaporimeter.
2. In the embodiment of the invention, the control module adjusts the duty ratio of the switching tube according to the sampling voltage at two ends of the sampling resistor, so that the current on the sampling resistor is maintained in a floating range, and the energy storage inductor performs corresponding electricity storage or discharge according to the current on the sampling resistor, so that the current on the electric heating tube is maintained in the same floating range as the current on the sampling resistor. Therefore, when the voltage of alternating current input to the rectifying and filtering module by the alternating current grid fluctuates, the current on the electric heating pipe is always maintained in a controllable floating range, the over-large or over-small output power of the electric heating pipe is prevented, and the situations that the defrosting is incomplete and the electric heating pipe has over-large output power to damage household appliances are avoided.
3. In the embodiment of the invention, the first energy storage capacitor is connected in parallel with the electric heating pipe, the first energy storage capacitor is charged when the voltage of the direct current input to the electric heating pipe by the rectifying and filtering module is increased, and the first energy storage capacitor is discharged when the voltage of the direct current input to the electric heating pipe by the rectifying and filtering module is reduced, so that ripples contained in the direct current input to the electric heating pipe by the rectifying and filtering module can be reduced, the direct current input to the electric heating pipe is more stable, and the output power of the electric heating pipe is more stable.
4. In the embodiment of the invention, the integrated circuit collects the voltages at two ends of the electric heating tube, compares the collected voltage value with the preset protection voltage value, if the collected voltage value exceeds the protection voltage value, the voltage fluctuation of the alternating current exceeds the regulation range of the switch tube, the integrated circuit cannot further reduce the current on the electric heating tube by controlling the duty ratio of the switch tube, and at the moment, the integrated circuit sends a disconnection instruction to a control electrode of the switch tube to disconnect the switch tube and stop supplying power to the electric heating tube, so that on one hand, the electric heating tube can be prevented from being damaged due to large current, and on the other hand, the household appliance product can be prevented from being burnt due to excessive heat of the electric heating tube.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A defrosting device applied to a household appliance comprising an evaporator is characterized by comprising: the device comprises a rectification filtering module, a control module, an electric heating pipe, an energy storage module, a switching tube and a sampling resistor;
the rectification filtering module is respectively connected with an alternating current power grid and the electric heating pipe, the switch pipe and the sampling resistor are sequentially connected in series, the sampling resistor is grounded, the energy storage module is connected with the electric heating pipe, and the control module is connected with the switch pipe;
the rectification filtering module is used for converting alternating current input by the alternating current power grid into direct current and transmitting the direct current to the electric heating pipe;
the control module is used for collecting sampling voltages at two ends of the sampling resistor and adjusting the duty ratio of the switching tube according to the sampling voltages so as to enable the current on the sampling resistor to be within a preset floating range;
the energy storage module is used for storing electric energy according to the current on the sampling resistor so as to enable the current on the electric heating pipe to be within the floating range;
the electric heating pipe is used for heating by utilizing the received electric energy so as to defrost the evaporator;
the rectification filtering module comprises: the second diode, the third diode, the fourth diode, the fifth diode and the second energy storage capacitor;
the anode of the fourth diode is grounded, the cathode of the fourth diode is connected with the anode of the second diode, and the cathode of the second diode is connected with the current input end of the electric heating tube;
the anode of the fifth diode is grounded, the cathode of the fifth diode is connected with the anode of the third diode, and the cathode of the third diode is connected with the current input end of the electric heating tube;
the negative electrode of the second energy storage capacitor is grounded, and the positive electrode of the second energy storage capacitor is connected with the current input end of the electric heating pipe;
the positive pole of the second diode is connected with the live wire of the alternating current power grid, and the positive pole of the third diode is connected with the zero line of the alternating current power grid.
2. The defrosting apparatus of claim 1 wherein the energy storage module comprises: an energy storage inductor and a first diode;
the energy storage inductor is connected in series between the electric heating tube and the switching tube;
the anode of the first diode is connected with the current output end of the energy storage inductor, and the cathode of the first diode is connected with the current input end of the electric heating pipe;
the energy storage inductor is used for releasing electric energy to reduce the current on the electric heating pipe when the current on the sampling resistor is reduced, and storing the electric energy to increase the current on the electric heating pipe when the current on the sampling resistor is increased, so that the current on the electric heating pipe is located in the floating range.
3. The defrosting apparatus of claim 2, wherein the energy storage module further comprises: a first energy storage capacitor;
the negative electrode of the first energy storage capacitor is connected with the current output end of the electric heating tube, and the positive electrode of the first energy storage capacitor is connected with the current input end of the electric heating tube.
4. The defrosting apparatus of any one of claims 1 to 3 wherein the control module comprises: the circuit comprises an integrated circuit, a first capacitor, a first resistor, a second resistor and a third resistor;
a power supply pin of the integrated circuit is connected with an external direct current power supply, one end of the first capacitor is connected with the power supply pin, and the other end of the first capacitor is grounded;
the grounding pin of the integrated circuit is grounded;
an output pin of the integrated circuit is connected with one end of the first resistor, and the other end of the first resistor is connected with a control electrode of the switch tube;
a first input pin of the integrated circuit is respectively connected with one ends of the second resistor and the third resistor, the other end of the second resistor is connected with a current output end of the electric heating tube, and the other end of the third resistor is connected with a current input end of the sampling resistor;
the integrated circuit is used for comparing a sampling voltage value input from the first input pin with a preset standard voltage value, if the sampling voltage value is smaller than the standard voltage value, sending a boosting instruction to a control electrode of the switch tube through the output pin so as to increase the duty ratio of the switch tube, and if the sampling voltage value is larger than the standard voltage value, sending a voltage reduction instruction to the control electrode of the switch tube through the output pin so as to reduce the duty ratio of the switch tube.
5. The defrosting apparatus of claim 4, wherein the control module further comprises: a second capacitor and a fourth resistor;
a filter pin of the integrated circuit is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with a current input end of the switch tube;
the integrated circuit is further used for carrying out filtering processing on the sampling voltage value according to the voltage value input from the filtering pin.
6. The defrosting apparatus of claim 4, wherein the control module further comprises: a fifth resistor and a sixth resistor;
one end of the fifth resistor is connected with a second input pin of the integrated circuit, and the other end of the fifth resistor is connected with a current output end of the electric heating tube;
one end of the sixth resistor is connected with the second input pin, and the other end of the sixth resistor is grounded;
the integrated circuit is further used for sending a disconnection instruction to a control electrode of the switch tube through the output pin after the voltage value input from the second input pin is larger than a preset protection voltage value, so that the switch tube is disconnected between the electric heating tube and the sampling resistor.
7. A defrosting method by using the defrosting device of any one of claims 1 to 6, which is applied to household appliances comprising an evaporator, and is characterized by comprising the following steps:
converting alternating current input by an alternating current power grid into direct current by using the rectification filtering module, and transmitting the direct current to the electric heating pipe;
sampling voltages at two ends of the sampling resistor are collected through the control module, and the duty ratio of the switching tube is adjusted according to the sampling voltages, so that the current on the sampling resistor is located in a preset floating range;
storing electric energy by using the energy storage module according to the current on the sampling resistor so as to enable the current on the heating pipe to be within the floating range;
and defrosting the evaporator by using the heat emitted by the electric heating pipe.
8. The method of claim 7, wherein when the energy storage module comprises an energy storage inductor,
the electric energy is stored according to the current on the sampling resistor, including:
and utilizing the energy storage inductor to release electric energy to reduce the current on the electric heating pipe when the current on the sampling resistor is reduced, and store the electric energy to increase the current on the electric heating pipe when the current on the sampling resistor is increased, so that the current on the electric heating pipe is positioned in the floating range.
9. The method of claim 7 or 8, wherein, when the control module comprises an integrated circuit,
the duty cycle of the switching tube is adjusted according to the sampling voltage, and the duty cycle adjusting method comprises the following steps:
the method comprises the steps of utilizing the integrated circuit, comparing a sampling voltage value input from a first input pin of the integrated circuit with a preset standard voltage value, if the sampling voltage value is smaller than the standard voltage value, sending a boosting command to a control electrode of the switch tube through an output pin of the integrated circuit to increase the duty ratio of the switch tube, and if the sampling voltage value is larger than the standard voltage value, sending a voltage reduction command to the control electrode of the switch tube through the output pin to reduce the duty ratio of the switch tube.
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| CN2047352U (en) * | 1988-08-03 | 1989-11-08 | 杨广柱 | Freezer temp. controlling and intelligent frost-thawing device |
| JPH116671A (en) * | 1997-06-16 | 1999-01-12 | Sharp Corp | Freezing refrigerating chamber |
| CN2367980Y (en) * | 1999-03-02 | 2000-03-08 | 申玉君 | Electricity-saving device for air cooler |
| CN2610248Y (en) * | 2003-04-16 | 2004-04-07 | 广东科龙电器股份有限公司 | Indoor single-pipe temp. intelligent frost removing air conditioner |
| CN101873736B (en) * | 2009-04-24 | 2012-10-31 | 辉芒微电子（深圳）有限公司 | LED (light-emitting diode) drive circuit |
| CN104121662B (en) * | 2014-06-30 | 2017-03-29 | 邯郸美的制冷设备有限公司 | A kind of air-conditioner and its defrosting control method and device |
| CN204290762U (en) * | 2014-10-15 | 2015-04-22 | 武汉杭久电气有限公司 | Auxiliary insulating power supply in machine |
| CN204559946U (en) * | 2015-03-27 | 2015-08-12 | 辽宁亿赛普节能技术有限公司 | Parking lot LED illumination System |
| JP2017101908A (en) * | 2015-12-04 | 2017-06-08 | 株式会社東芝 | Control device, control method and control program |
| CN205261962U (en) * | 2015-12-22 | 2016-05-25 | 重庆泰思特试验仪器有限公司 | A constant temperature control system for high altitude test of low temperature case |
| CN105423513B (en) * | 2015-12-30 | 2018-04-10 | 四川长虹空调有限公司 | Power continuously adjustabe electric heating system and its control method |
| CN205718118U (en) * | 2016-06-23 | 2016-11-23 | 刘滕军 | Air-cooler senses microwave defrosting device automatically |
| CN206323142U (en) * | 2016-12-21 | 2017-07-11 | 深圳市芯海互联技术有限公司 | A kind of zero harmonic wave disturbs the heating control circuit of variable power |
| CN107053997A (en) * | 2016-12-22 | 2017-08-18 | 重庆长安汽车股份有限公司 | Automobile air-conditioning evaporator defroster and method |
| CN206422703U (en) * | 2017-02-20 | 2017-08-18 | 四川鸿创电子科技有限公司 | A kind of single-phase AC DC converters corrected based on high power factor |
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