CN220746353U

CN220746353U - Clothes dryer

Info

Publication number: CN220746353U
Application number: CN202321779669.6U
Authority: CN
Inventors: 毕建军; 高丽君; 毛常青; 丁兆波; 王增强
Original assignee: Hisense Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2024-04-09
Anticipated expiration: 2033-07-07

Abstract

The present utility model discloses a clothes dryer, comprising: a case and a drum; a discharge resistor; a bidirectional thyristor connected in series with the discharge resistor; the control unit is electrically connected with the power supply to output a high-level signal when the power supply works normally; the discharging control circuit comprises a first conduction unit, a second conduction unit and an energy storage unit, wherein the output end of the first conduction unit is connected with the trigger electrode of the bidirectional thyristor, the control end of the first conduction unit is connected to the output end of the control unit and the signal ground, the input end of the first conduction unit is connected with the output end of the second conduction unit, the output end of the second conduction unit is connected with the energy storage unit in series and the signal ground, and the control end and the input end of the second conduction unit are respectively connected with the output end of the control unit and the first power supply. According to the utility model, the opening and closing of the discharge resistor are controlled, the discharge circuit where the discharge resistor is positioned is controlled to be disconnected during standby, and the discharge resistor is discharged below the safety voltage and then disconnected when the power supply is pulled down, so that the safety requirement of discharge is met, and the standby power consumption is reduced.

Description

Clothes dryer

Technical Field

The utility model relates to the technical field of household appliances, in particular to a clothes dryer.

Background

A clothes dryer is a common household appliance provided with a laundry accommodating chamber and a drying air duct communicated with the laundry accommodating chamber, and an evaporator and a condenser are generally arranged in the drying air duct. In the process of drying clothes, the temperature of the air in the drying air duct is raised through the evaporator, so that the hot air in the drying air duct and the air in the clothes accommodating cavity circulate, the moisture of the clothes in the clothes accommodating cavity is taken away through circulating air, and the condenser further realizes the condensation of the moisture in the air.

The standby power consumption of the existing clothes dryer can meet the requirements of the standard of the energy efficiency limiting value and the energy efficiency grade of household and similar-purpose electric appliances, but in order to improve the energy efficiency of the household electric appliances and achieve the purposes of energy conservation and emission reduction, the standby power consumption of the clothes dryer still needs to be further reduced. During standby of the dryer, standby power consumption includes power consumption generated by the discharge resistor. The purpose of the discharge resistor is to ensure safety and to prevent personnel from touching the component with the residual charge after the power supply is disconnected. The clothes dryer is provided with the discharging resistor which is directly connected in series between L, N, and consumed electric energy is continuously generated in the standby state of the clothes dryer, so that the standby power is too high, and unnecessary energy waste and electricity fee expenditure are caused. In view of this, the present application is presented.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. For this purpose,

according to an embodiment of the present disclosure, there is provided a clothes dryer, including:

a box body in which a drying air duct is formed;

the roller is rotationally arranged in the box body and is communicated with the drying air duct;

a discharge resistor;

the bidirectional thyristor is connected with the discharge resistor in series to form a discharge circuit;

the control unit is electrically connected with the power supply and used for outputting a high-level signal when the power supply works normally;

the discharging control circuit comprises a first conduction unit, a second conduction unit and an energy storage unit, wherein the output end of the first conduction unit is connected with the trigger electrode of the bidirectional triode thyristor, the control end of the first conduction unit is connected to the output end of the control unit and signal ground, the input end of the first conduction unit is connected with the output end of the second conduction unit, the output end of the second conduction unit is connected with the energy storage unit in series and is connected to the signal ground, and the control end and the input end of the second conduction unit are respectively connected with the control unit and the first power supply;

when the power supply works normally, the control end of the second conduction unit receives the high-level signal to conduct so as to enable the energy storage unit to be in an energy storage state, and the first conduction unit receives the high-level signal to open so as to enable the bidirectional thyristor to open; after power failure, the control end of the first conduction unit is connected with the signal ground, the high level of the energy storage unit is input into the input end of the first conduction unit, the output end of the first conduction unit outputs a high level control signal to the bidirectional thyristor to control the bidirectional thyristor to conduct so as to conduct the discharge circuit.

In the technical scheme, the control unit is used for detecting the working state of the power supply, outputting a high-level signal during normal operation, and emptying an output end after power failure; the discharge control circuit receives and controls the on or off state of the discharge circuit according to the level signal output by the control unit. When the power supply works normally, the discharging control circuit controls the discharging circuit to be disconnected, so that the discharging circuit exits from the working circuit, and then when the clothes dryer stands by, the discharging resistor cannot generate inherent loss, that is, the discharging resistor cannot consume power, and the stand-by power consumption of the clothes dryer is effectively reduced. Meanwhile, when the discharge control circuit is used, the standby power consumption of the clothes dryer is not increased, and the discharge control circuit is simple and convenient. When the power supply is powered off, the discharge control circuit controls the discharge circuit to be conducted, and at the moment, the discharge circuit and the energy storage unit form a discharge loop, so that the energy storage unit can be rapidly discharged, and the discharge speed is improved.

According to an embodiment of the disclosure, the control unit is a control chip of a main control circuit of the clothes dryer, the control chip is provided with a first output pin and a second output pin, and the first output pin and the second output pin are respectively connected with a control end of the second conduction unit and a control end of the first conduction unit; after power is off, the first output pin and the second output pin are empty.

According to an embodiment of the disclosure, the first conduction unit includes a PNP transistor, a base of the PNP transistor is connected to the second output pin and the signal ground, and a collector of the PNP transistor is connected to the triac; the second conduction unit comprises an NPN triode, the base electrode of the NPN triode is connected with the first output pin, the collector electrode of the NPN triode is connected with the first power supply, and the emitter electrode of the NPN triode is connected to the emitter electrode of the PNP triode and the energy storage unit.

According to an embodiment of the disclosure, the discharge control circuit further includes a first resistor, the energy storage unit is connected in series with the first resistor and the signal ground, and a base of the PNP transistor is connected with the signal ground through the first resistor; the level of the second output pin is pulled down to be low level by setting the first resistor to be matched with the signal ground to form a pull-down resistor.

According to the embodiment of the disclosure, the discharge control circuit further comprises a second resistor, the emitter of the NPN triode is connected with the energy storage unit through the second resistor, and the second resistor is used for playing a role in current limiting.

According to an embodiment of the present disclosure, the energy storage unit includes a capacitor C1.

In addition, the present application also provides a clothes dryer, including:

a box body in which a drying air duct is formed;

a discharge resistor;

a switching device connected in series with the discharge resistor to form a discharge circuit;

the control unit is electrically connected with the power supply and used for outputting a high-level signal when the power supply works normally and outputting a low-level signal after power failure;

the input end of the discharging control circuit is connected with the control unit, and the output end of the discharging control circuit is connected with the switching device, wherein the discharging control circuit comprises an energy storage unit and a first power supply;

when the power supply works normally, the first power supply stores energy for the energy storage unit after the discharge control circuit receives a high-level signal of the control unit; after the power is off, the discharging control circuit receives the low-level signal of the control unit and then outputs a control signal at the output end of the discharging control circuit, the control signal controls the switching device to be conducted so as to conduct the discharging circuit, and the energy storage unit discharges through the discharging resistor.

According to the clothes dryer provided by the technical scheme, the control unit is arranged to detect the working state of the power supply, the high-level signal is output during normal operation, and the low-level signal is output after power failure, so that the clothes dryer is simple and convenient; meanwhile, a discharge circuit formed by the bidirectional thyristor can be turned on and off by arranging the bidirectional thyristor, and the discharge control circuit receives a level signal output by the control unit and generates a control signal to control the conduction state of the discharge circuit. When the power supply works normally, the discharging control circuit controls the discharging circuit to be disconnected, so that the discharging circuit exits from the working circuit, and then when the power supply works normally, the clothes dryer stands by, inherent loss cannot be generated, that is, the discharging resistor cannot consume power, and the stand-by power consumption of the clothes dryer is effectively reduced. When the power supply is powered off, the discharge control circuit controls the discharge circuit to be conducted, and at the moment, the discharge circuit and the energy storage unit form a discharge loop, so that the energy storage unit can be rapidly discharged, and the discharge speed is improved.

According to the embodiment of the disclosure, the switching device is any one of a silicon controlled rectifier, a MOS tube, a triode and a relay.

According to an embodiment of the disclosure, the discharge control circuit further includes a PNP type triode and an NPN type triode, a base electrode of the PNP type triode is connected to the second output pin of the control unit and signal ground, a collector electrode of the PNP type triode is connected to the switching device, and an emitter electrode of the PNP type triode is connected to an emitter electrode of the NPN type triode; the collector of the NPN triode is connected with the first power supply, the base of the NPN triode is connected with the first output pin of the control unit, and the emitter of the NPN triode is connected to signal ground through the energy storage unit.

According to the embodiment of the disclosure, the discharge control circuit further comprises a second resistor, and the emitter of the NPN triode is connected with the energy storage unit through the second resistor, wherein the second resistor is used for limiting current.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIGS. 1 to 3 are schematic structural views of a clothes dryer according to an embodiment of the present utility model;

FIG. 4 is a circuit diagram of a discharge circuit and a discharge control circuit according to an embodiment of the present utility model;

FIG. 5 is a circuit diagram of a discharge circuit and a discharge control circuit according to an embodiment of the present utility model;

FIG. 6 is a circuit diagram of a discharge circuit and a discharge control circuit according to another embodiment of the present utility model;

FIG. 7 is a circuit diagram of a discharge circuit and a discharge control circuit according to yet another embodiment of the present utility model;

FIG. 8 is a circuit diagram of a control chip with a control unit for controlling electric control according to an embodiment of the present utility model;

fig. 9 is a circuit diagram of a discharge circuit and a discharge control circuit including a relay according to an embodiment of the present utility model;

fig. 10 is a circuit diagram of a discharge circuit and a discharge control circuit including a relay according to another embodiment of the present utility model.

A clothes dryer 100; a case 1; a drying air duct 11; a front duct 111; a rear duct 112; a lower duct 113; a drum 12; an air inlet 121; an air outlet 122; a cartridge front seal 123; a cartridge rear seal 124; a laundry accommodating chamber 125; a motor 126; a belt 127; a blower 13; an evaporator 141; a condenser 142; a first water storage tank 15; a second water storage tank 16; a drain pump 17; a first drain pipe 171; a water container 18; a water container tray 19; a second drain pipe 191; a discharge circuit 2; a bidirectional thyristor 21; a control unit 3; a discharge control circuit 4; a door 5; a main control board 6; a main control circuit 7; PNP transistor Q1; NPN transistor Q2; a discharge resistor R; a first resistor R1; a second resistor R2; a capacitor C1; signal ground SGND; a live wire L; zero line N.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described and illustrated below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments provided herein, are intended to be within the scope of the present application.

It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is possible for those of ordinary skill in the art to apply the present application to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the embodiments described herein can be combined with other embodiments without conflict.

The terms "connected," "coupled," and the like in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein refers to two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The clothes dryer is a general household appliance provided with a laundry accommodating chamber and a drying air duct 11 communicating with the laundry accommodating chamber, and an evaporator 141 and a condenser 142 are generally provided in the drying air duct 11. In the process of drying clothes, the temperature of the air in the drying air duct 11 is raised through the evaporator 141 so as to circulate the hot air in the drying air duct 11 and the air in the clothes accommodating cavity, and further, the moisture of the clothes in the clothes accommodating cavity is taken away through the circulating air, and the condenser 142 further realizes the condensation of the moisture in the air. The power supply of the existing clothes dryer is provided, the discharging resistor R is directly connected between the live wire L and the zero wire N in series, and when the clothes dryer is in standby, the discharging resistor R continuously consumes electric energy, so that the standby power consumption is overhigh and is not consistent.

In the existing power supply product, when the power supply works normally, the voltage is arranged at two ends of the capacitor, and the discharging resistor R is arranged at two ends of the capacitor, so that inherent loss is generated, and the existing power supply product has low overall efficiency of the power supply and low discharging rate of the capacitor due to the existence of the inherent loss of the discharging resistor R.

The present utility model proposes a clothes dryer 100, and the clothes dryer 100 will be described with reference to fig. 1 to 10, wherein fig. 1 to 3 are schematic structural views of the clothes dryer.

Referring to fig. 1, the clothes dryer 100 includes a cabinet 1, the cabinet 1 forming an external appearance of the clothes dryer 100, and the cabinet 1 having an accommodating space therein for accommodating and fixing various components in the clothes dryer 100 to ensure structural stability of the clothes dryer 100.

The clothes dryer 100 further includes a drum 12, the drum 12 being rotatably provided in the cabinet 1, the drum 12 having a laundry accommodating chamber formed therein, the laundry accommodating chamber for accommodating laundry to be dried to dry the laundry to be dried therein. The drum 12 is provided with an air inlet 121 and an air outlet 122, the air inlet 121 and the air outlet 122 are all communicated with the clothes accommodating cavity, the dryer 100 generates a drying air flow in the drying process, and the drying air flow enters the clothes accommodating cavity from the air inlet 121 and takes away moisture on clothes to be led out from the air outlet 122. Referring to fig. 1, in the present embodiment, the air inlet 121 and the air outlet 122 are respectively disposed at the left and right sides of the drum 12, and the rotation of the drum 12 is implemented by a transmission mechanism formed by a motor and a belt.

With continued reference to fig. 1, the dryer 100 further includes a cabinet door 5, and the cabinet door 5 is connected to the cabinet 1 to form an opening and closing structure. The door 5 is arranged at one side of the drum 12, and clothes are put in or taken out by opening and closing the door 5, so that the clothes in the clothes accommodating cavity are taken in or put out.

The air duct plate is arranged in the box body 1, a drying air duct 11 is formed between the air duct plate, the drying air duct 11 is arranged between the box body 1 and the roller 12, two ends of the drying air duct 11 are respectively communicated with an air inlet 121 and an air outlet 122 of the roller 12 to form a loop channel, a fan 13 is arranged in the drying air duct 11, the fan 13 is used for enabling air in the drying air duct 11 to flow towards the direction from the air outlet 122 to the air inlet 121 so that air in the clothes accommodating cavity enters the drying air duct 11 through the air outlet 122, and air in the drying air duct 11 enters the clothes accommodating cavity through the air inlet 121 so as to realize air circulation between the clothes accommodating cavity and the drying air duct 11. In this embodiment, the fan 13 is a centrifugal fan, which is located at a side close to the air inlet 121 of the drum 12 and driven by a motor, and the space between the drum 12 and the air duct board is sealed by a front drum seal 123 and a rear drum seal 124.

In this embodiment, the drying air duct 11 includes a front air duct 111 communicating with one side of the drum 12, a rear air duct 112 communicating with the other side of the drum 12, and a lower air duct 113, the front air duct 111 and the rear air duct 112 are communicated through the lower air duct 113, and the drying air duct 11 is communicated with the laundry accommodating chamber to form a loop passage. Referring to fig. 1 to 3, the arrow direction is the air circulation direction in the loop passage.

A drying device is provided in the drying duct 11, and is used for heating the condensed drying air flow, and the heated drying air flow is introduced into the clothes accommodating cavity from the air inlet 121. The drying device is further used for condensing the high-temperature and high-humidity airflow guided out by the air outlet 122 to condense out moisture in the high-temperature and high-humidity airflow to form condensed water. The circulation is realized that the moisture of clothes in the clothes accommodating cavity is taken away through the drying airflow, so that the moisture on the clothes is separated from the clothes, and the clothes are dried.

Specifically, in the embodiment, the drying device is disposed in the lower air duct 113, and the drying device includes a condenser 142 and an evaporator 141, the condenser 142 is located on one side of the evaporator 141 near the air inlet 121 on the drum 12, the condenser 142 is used for heating the air in the drying air duct 11 to form a high-temperature dry drying air flow, the drying air flow passes through the rear drying air duct 11 and enters the drum 12 to evaporate the water of the laundry to be dried in the drum 12 to form a high-temperature high-humidity air flow, the high-temperature high-humidity air flow guided out from the drum 12 has more water vapor, and the high-temperature high-humidity air flow contacts with the low-temperature evaporator 141 on the surface in the lower air duct 113 to separate out condensed water after passing through the front air duct 111 to form a low-temperature low-humidity air flow, and the low-temperature low-humidity air flow is further heated by the condenser 142 to form a high-temperature dry drying air flow.

Referring to fig. 1 to 3, the clothes dryer 100 further includes a water storage tank for collecting condensed water formed on the evaporator 141. In this embodiment, the water storage tank includes a first water storage tank 15 and a second water storage tank 16, the first water storage tank 15 is disposed in the lower air duct 113 and is located below the drying device, and the second water storage tank 16 is disposed outside the drying air duct 11 and is communicated with the first water storage tank 15, so that condensed water collected in the first water storage tank 15 enters the second water storage tank 16. The volume of the water storage tank can be effectively increased by dividing the water storage tank into two parts and respectively positioned at the inner side and the outer side of the drying air duct 11, so that the capacity of the water storage tank can be increased.

In order to drain the condensed water in the water storage tank, a drain pump 17 is provided in the second water storage tank 16, the drain pump 17 being used to drain the water in the second water storage tank 16 into a water container 18 or to the outside of the tank 1.

The top of the tank 1 is provided with a water container 18, the top of the water container 18 is provided with a water inlet, and the water inlet is communicated with the drainage pump 17 through a first drainage pipe 171. In this embodiment, the first drain pipe 171 extends from the bottom of the tank 1 to the top of the tank 1, and the first drain pipe 171 communicates with the water container 18 through a water inlet to drain the condensed water in the second water storage tank 16 into the water container 18.

Further, the top of the box body 1 is also provided with a water container tray 19, a water container 18 is arranged in the water container tray 19, and the water container tray 19 is communicated with the water storage tank. Specifically, a water outlet is formed in the bottom of the water container tray 19, the water outlet is arranged corresponding to the second water storage tank 16, the water outlet is communicated with the first water storage tank 15 through a second water drain pipe 191, and the water container tray 19 is communicated with the second water storage tank 16 through the water outlet and the second water drain pipe 191. When the water in the water container 6 overflows into the water container tray 19, the water flows into the second water storage tank 16 through the second water discharging pipe 191 to relieve the overflow condition of the water container 6.

The clothes dryer 100 further comprises a main control circuit 7, the main control circuit 7 comprises a main control board 6, the input end of the main control board 6 is electrically connected with a power supply, the output end of the main control circuit 7 is electrically connected with at least the motor, and the evaporator 141 and the condenser 142 are matched with loads such as a centrifugal fan and a roller 12 to work according to the preset logic power on through control. In this embodiment, the power supply includes a neutral line N and a live line L.

Referring to fig. 4 to 8, the dryer 100 further includes a discharge resistor R, a triac 21, a control unit 3, and a discharge control circuit 4. The discharging resistor R is connected in series between the zero line N and the live line L, and the bidirectional thyristor 21 is connected in series with the discharging resistor R to form a discharging circuit 2. The control unit 3 is electrically connected with the power supply to detect the working state of the power supply, and is simple and convenient. The triac 21 is characterized in that the trigger electrode is turned on at a high level and is opened at a low level.

When the power supply works normally, the output end of the control unit 3 outputs a high-level signal; when the power is off, the output end of the control unit 3 is empty. The discharging control circuit 4 is connected with the output end of the control unit 3, the output end of the discharging control circuit 4 is connected with the bidirectional thyristor 21, and is used for controlling the bidirectional thyristor 21 to be disconnected when detecting that the power supply works normally, so that the discharging circuit 2 is disconnected, and when the clothes dryer 100 is in a standby state, the discharging resistor R is opened, so that power is not consumed, the standby power consumption is effectively reduced, and the effect of high efficiency and energy saving is achieved. Meanwhile, when the power supply is detected to be powered off, the discharge control circuit 4 generates a control signal, the control signal acts on the bidirectional thyristor 21, the bidirectional thyristor 21 is conducted, so that the discharge circuit 2 is conducted, and the discharge resistor R finishes discharging the discharge control circuit 4, thereby meeting the discharge safety requirement. That is, the discharge resistor is closed with a delay when the power line is pulled out, and the discharge is completed before the resistor is opened so as to meet the safety requirements.

Specifically, the discharge control circuit 4 includes a first conduction unit, a second conduction unit and an energy storage unit, the output end of the first conduction unit is connected with the trigger electrode of the triac 21, the control end of the first conduction unit is connected to the output end of the control unit 3, meanwhile, the control end of the first conduction unit is connected to the signal ground SGND, the input end of the first conduction unit is connected with the output end of the second conduction unit, the output end of the second conduction unit is connected with the energy storage unit in series to the signal ground SGND, and the control end and the input end of the second conduction unit are respectively connected with the control unit 3 and the first power supply.

In the above embodiment, the energy storage unit includes the capacitor C1, and when the power source works normally, the control end of the second conduction unit receives the high level signal output by the control unit 3 and conducts, and the first power source charges the capacitor C1, so that the capacitor C1 is in a charging state until the capacitor C1 is fully charged. The control end of the first conduction unit receives the high-level signal output by the control unit 3, so that the first conduction unit is opened, and the bidirectional thyristor 21 is opened, namely the discharge circuit 2 is disconnected, and the working circuit is exited. After power failure, the control end of the first conduction unit is connected with the signal ground SGND, the control end inputs low level, the high level of the energy storage unit is input into the input end of the first conduction unit, the first conduction unit is conducted, the output end of the first conduction unit outputs a high level control signal to the bidirectional thyristor 21, the bidirectional thyristor 21 is controlled to conduct, the discharging circuit 2 is conducted, and the discharging resistor R finishes discharging of the discharging control circuit 4.

Referring to fig. 8, the control unit 3 is a control chip of a main control circuit 7 of the clothes dryer 100, and the control chip is connected with a power supply through the main control circuit 7. The control chip is provided with a first output Pin Pin1 and a second output Pin Pin2, and the first output Pin Pin1 and the second output Pin Pin2 are respectively connected with the control end of the second conduction unit and the control end of the first conduction unit; when the power supply works normally, the first output Pin Pin1 and the second output Pin Pin2 both output high-level signals, and after power is off, the first output Pin Pin1 and the second output Pin Pin2 are empty.

It should be noted that the control chip may be a processor in the prior art. The processor may be a digital signal processor, a single chip microcomputer, a microprocessor, a microcontroller, or the like. The processor may also be any other means for performing a processing function, such as a circuit, device, or software module.

Specifically, referring to fig. 4, in the present embodiment, the first conducting unit includes a PNP type transistor Q1, a base b of the PNP type transistor Q1 is connected to the second output Pin2, and is connected to the signal ground SGND, and a collector c of the PNP type transistor Q1 is connected to the trigger electrode of the triac 21. The second conducting unit comprises an NPN triode Q2, a base b of the NPN triode Q2 is connected with the first output Pin Pin1, a collector C of the NPN triode Q2 is connected with the first power supply, and an emitter e of the NPN triode Q2 is connected to an emitter e of the PNP triode Q1 and the energy storage unit, namely the capacitor C1. In this embodiment, the first power supply may be set according to actual needs, and the first power supply is an exemplary 12V power supply.

When the clothes dryer 100 is powered on and started, the first output Pin Pin1 outputs a high level, the second output Pin Pin2 outputs a high level, the NPN triode Q2 is conducted, the PNP triode Q1 is opened, the bidirectional triode 21 is opened, the discharging resistor R is opened, power is not consumed, and meanwhile the capacitor C1 is fully charged. When the power supply is in standby, the first output Pin Pin1 outputs a high level, the second output Pin Pin2 outputs a high level, the NPN triode Q2 is conducted, the PNP triode Q1 is opened, and the bidirectional triode 21 is opened, so that the discharging resistor R is opened, power is not consumed, and meanwhile, the capacitor C1 is fully charged. In this embodiment, after the capacitor C1 is fully charged, the whole discharging control circuit 4 does not consume electric energy, so that standby power consumption of the clothes dryer system is not increased.

When the clothes dryer 100 pulls out the power supply and cuts off the power supply, the first output Pin Pin1 is empty, the second output Pin Pin2 is not conducted, namely, the NPN triode Q2 is opened, the high level of the capacitor C1 is input to the emitter e of the PNP triode Q1, the base b of the PNP triode Q1 is connected with the signal ground SGND and receives the low level input, so that the PNP triode Q1 and the collector C of the PNP triode Q1 input the high level to the bidirectional thyristor 21, the bidirectional thyristor 21 is conducted, and the discharge resistor R finishes discharging the circuit. In this embodiment, the discharging control circuit 4 and the bidirectional thyristor 21 are provided to control the discharging circuit 2, so that the discharging resistor R is turned off when the clothes dryer 100 is in standby, and is turned off when the power supply is pulled out and the discharging resistor R is discharged below the safety voltage, thereby not only meeting the safety requirement of discharging, but also reducing the standby power consumption and meeting the requirement of the clothes dryer 100 for smaller standby power consumption.

Further, referring to fig. 5, in order to ensure the turn-on of the PNP transistor Q1 after the power is turned off, the discharge control circuit 4 further includes a first resistor R1, the energy storage unit, i.e., the capacitor C1, is connected in series with the first resistor R1 and connected to the signal ground SGND, and the base b of the PNP transistor Q1 is connected to the signal ground SGND through the first resistor R1. Specifically, one end of the first resistor R1 is connected to the signal ground SGND, and the other end is connected to the capacitor C1, and is connected to the base b of the PNP transistor Q1. In this embodiment, by setting the first resistor R1, when the second output Pin2 is empty, the first resistor R1 and the signal ground SGND cooperate to form a pull-down resistor, so that the level of the second output Pin2 is pulled down to be a low level, and it is ensured that the PNP transistor Q1 can be turned on. Meanwhile, when the second output Pin2 outputs a high-level signal, the first resistor R1 is matched with the capacitor C1, so that the PNP transistor Q1 can be turned off rapidly.

Referring to fig. 6 and 7, the discharge control circuit 4 further includes a second resistor R2, where the second resistor R2 is connected in series between the emitter of the NPN transistor Q2 and the emitter of the PNP transistor Q1, and the emitter of the NPN transistor Q2 is connected to the energy storage unit through the second resistor R2. Specifically, one end of the second resistor R2 is connected to the emitter of the NPN transistor Q2, and the other end is connected to the emitter of the PNP transistor Q1, and is connected to the capacitor C1. In this embodiment, the second resistor R2 is used for current limiting, so as to protect the discharge control circuit 4.

Example 2

This embodiment differs from embodiment 1 in that: the switching device is connected in series with the discharge resistor R to form a discharge circuit 2, and the control unit 3 is electrically connected with the power supply and is used for outputting a high-level signal when the power supply works normally and outputting a low-level signal after power failure; the input end of the discharge control circuit 4 is connected with the control unit 3, and the output end of the discharge control circuit 4 is connected with the switching device.

Specifically, the control unit 3, i.e. the control chip, has a first output Pin1 and a second output Pin2, and when the power supply works normally, the control chip controls the first output Pin1 and the second output Pin2 to output high-level signals; after the power is off, the control chip controls the first output Pin Pin1 and the second output Pin Pin2 to output low-level signals.

The discharging control circuit 4 comprises an energy storage unit and a first power supply, and when the power supply works normally, the discharging control circuit 4 receives a high-level signal of the control unit 3 and then the first power supply stores energy for the energy storage unit; after the power is cut off, the discharging control circuit 4 receives the low-level signal of the control unit 3, and then the output end of the discharging control circuit outputs a control signal, and the control signal controls the switching device to be conducted so as to conduct the discharging circuit 2, and the energy storage unit discharges through the discharging resistor R. The switching device is any one of a silicon controlled rectifier, a MOS tube, a triode and a relay. Referring to fig. 9 and 10, the switching device is a relay.

The clothes dryer 100 provided by the embodiment is simple and convenient by arranging the control unit 3 to detect the working state of the power supply, outputting a high-level signal during normal operation and outputting a low-level signal during power failure; meanwhile, the discharge circuit 2 formed by setting the switching device to be controllably turned on and off with the discharge resistor R. When the power supply works normally, the discharging control circuit 4 controls the discharging circuit 2 to be disconnected, so that the discharging circuit 2 exits from the working circuit, and then when the clothes dryer stands by, the discharging resistor R does not generate inherent loss, that is, the discharging resistor R does not consume power, and the stand-by power consumption of the clothes dryer is effectively reduced. When the power supply is powered off, the discharging control circuit 4 controls the switching device to be conducted, so that the discharging circuit 2 is conducted, at the moment, the discharging circuit 2 and the discharging control circuit form a discharging loop, rapid discharging of the circuit is achieved, and the discharging speed is improved.

Further, in the present embodiment, the discharge control circuit 4 further includes a PNP type triode Q1 and an NPN type triode Q2, the base b of the PNP type triode Q1 is connected to the second output Pin2 of the control unit 3 and the signal ground SGND, the collector c of the PNP type triode Q1 is connected to the switching device, and the emitter e of the PNP type triode Q1 is connected to the emitter e of the NPN type triode Q2. The collector c of the NPN triode Q2 is connected with a first power supply, the base b of the NPN triode Q2 is connected with a first output Pin Pin1 of the control unit 3, and the emitter e of the NPN triode Q2 is connected to a signal ground SGND through an energy storage unit.

Further, the discharge control circuit 4 further includes a second resistor R2, where the second resistor R2 is connected in series between the emitter of the NPN transistor Q2 and the emitter of the PNP transistor Q1, and the emitter of the NPN transistor Q2 is connected to the energy storage unit through the second resistor R2. Specifically, one end of the second resistor R2 is connected to the emitter of the NPN transistor Q2, and the other end is connected to the emitter of the PNP transistor Q1, and is connected to the capacitor C1. Wherein the second resistor R2 acts as a current limiting function. In this embodiment, the discharge control circuit 4 may further include a first resistor R1 in embodiment 1, and its specific connection structure is the same as that of embodiment 1.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A clothes dryer, comprising:

a box body in which a drying air duct is formed;

a discharge resistor;

the control unit is electrically connected with the power supply and used for outputting a high-level signal when the power supply works normally; after power failure, the output end of the control unit is emptied;

the discharging control circuit comprises a first conduction unit, a second conduction unit and an energy storage unit, wherein the output end of the first conduction unit is connected with the trigger electrode of the bidirectional triode thyristor, the control end of the first conduction unit is connected to the output end of the control unit and the signal ground, the input end of the first conduction unit is connected with the output end of the second conduction unit, the output end of the second conduction unit is connected with the energy storage unit in series and is connected to the signal ground, and the control end and the input end of the second conduction unit are respectively connected with the output end of the control unit and the first power supply;

2. The clothes dryer of claim 1, wherein the control unit is a control chip of a main control circuit of the clothes dryer, the control chip is provided with a first output pin and a second output pin, and the first output pin and the second output pin are respectively connected with a control end of the second conduction unit and a control end of the first conduction unit; after power is off, the first output pin and the second output pin are empty.

3. The clothes dryer of claim 2, wherein,

the first conduction unit comprises a PNP type triode, the base electrode of the PNP type triode is connected to the second output pin and the signal ground, and the collector electrode of the PNP type triode is connected with the bidirectional triode thyristor;

the second conduction unit comprises an NPN triode, the base electrode of the NPN triode is connected with the first output pin, the collector electrode of the NPN triode is connected with the first power supply, and the emitter electrode of the NPN triode is connected to the emitter electrode of the PNP triode and the energy storage unit.

4. The clothes dryer of claim 3 wherein the discharge control circuit further includes a first resistor, the energy storage unit is connected in series with the first resistor and the signal ground, and a base of the PNP transistor is connected with the signal ground through the first resistor.

5. The clothes dryer of claim 3 or 4 wherein the discharge control circuit further includes a second resistor, and the emitter of the NPN transistor is connected to the energy storage unit through the second resistor.

6. The laundry dryer according to any one of claims 1 to 4, characterized in that the energy storage unit comprises a capacitor C1.

7. A clothes dryer, comprising:

a box body in which a drying air duct is formed;

a discharge resistor;

8. The clothes dryer of claim 7 wherein the switching device is any one of a silicon controlled rectifier, a MOS transistor, a triode, and a relay.

9. The clothes dryer of claim 7 or 8, wherein the discharge control circuit further comprises a PNP type triode and an NPN type triode, a base of the PNP type triode is connected to the second output pin of the control unit and signal ground, a collector of the PNP type triode is connected to the switching device, and an emitter of the PNP type triode is connected to an emitter of the NPN type triode; the collector of the NPN triode is connected with the first power supply, the base of the NPN triode is connected with the first output pin of the control unit, and the emitter of the NPN triode is connected to signal ground through the energy storage unit.

10. The clothes dryer of claim 9 wherein the discharge control circuit further includes a second resistor, and the emitter of the NPN transistor is connected to the energy storage unit through the second resistor.