阅读说明：本技术 一种冰箱化霜系统及方法 (Refrigerator defrosting system and method ) 是由 高冬花 李帅明 梁立超 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种冰箱化霜系统及方法,涉及冰箱化霜技术领域。本发明中：化霜系统内,对加热器的加热时间进行周期分割,预设N个基本加热周期；每个基本加热周期内,加热器的发热能量相同。化霜系统内,预设标准基本加热周期；当加热时间小于标准基本加热周期时,基本加热周期与标准基本加热周期相等；基本加热周期大于或等于标准基本加热周期,基本加热周期只由加热时间组成。电压检测单元在每个基本加热周期的开始时刻检测实际电压值,单片机根据实际电压值计算出当前周期内的加热时间。本发明保证了化霜周期内总化霜能量的恒定,避免设计电压和实际电压不一致导致的化霜问题,同时恒热量的调节控制也避免了温度熔断器的熔断事故。(The invention discloses a refrigerator defrosting system and method, and relates to the technical field of refrigerator defrosting. In the invention: in the defrosting system, the heating time of a heater is periodically divided, and N basic heating periods are preset; the heating energy of the heater is the same in each basic heating period. Presetting a standard basic heating period in a defrosting system; when the heating time is less than the standard basic heating period, the basic heating period is equal to the standard basic heating period; the basic heating period is greater than or equal to a standard basic heating period, and the basic heating period only consists of heating time. The voltage detection unit detects an actual voltage value at the starting moment of each basic heating period, and the single chip microcomputer calculates the heating time in the current period according to the actual voltage value. The invention ensures the constancy of the total defrosting energy in the defrosting period, avoids the defrosting problem caused by the inconsistency of the design voltage and the actual voltage, and simultaneously, the adjustment and control of the constant heat quantity also avoids the fusing accident of the temperature fuse.)

1. The utility model provides a refrigerator defrosting system, the defrosting system includes system hardware device, and system hardware device includes an integrated circuit board, heater which characterized in that:

(1) a voltage detection unit, a singlechip and a relay are arranged on the integrated circuit board, and a heater is arranged on the periphery of the evaporator;

(2) in the defrosting system, the heating time of a heater is periodically divided, and N basic heating periods T are preset;

wherein, in each basic heating period T, the heating energy of the heater is the same;

wherein the basic heating cycle is divided into a heating time T₁And a non-heating time T₂；

(3) In the defrosting system, a standard basic heating period T is preset₀；

When the heating time T is₁Less than the standard basic heating period T₀When the basic heating period is equal to the standard basic heating period, i.e. T ═ T₀Time of non-heating T₂＝T₀-T₁；

When the heating time T is₁Not less than the standard basic heating period T₀When the heating time is T, the basic heating period is greater than or equal to the standard basic heating period, the basic heating period only consists of heating time and has no non-heating time₁；

(4) The voltage detection unit detects an actual voltage value at the starting moment of each basic heating period, and the single chip microcomputer calculates the heating time in the current period according to the actual voltage value.

2. The refrigerator defrosting system according to claim 1, wherein:

the duration of the basic heating period is 1-20S.

3. The refrigerator defrosting system according to claim 1, wherein:

the standard basic heating period was calculated at a standard voltage of 220V.

4. The refrigerator defrosting system according to claim 1, wherein:

(1) when the heater is in a heating time period, the singlechip outputs a control signal to enable the relay to be in a conducting state, and the mains supply voltage is connected to the heater for heating;

(2) when the heater is in a non-heating time period, the singlechip outputs a control signal to enable the relay to be in a closed state, and the heater is not communicated with the commercial power and is in a non-heating state.

5. The refrigerator defrosting system according to claim 1, wherein:

and when the heating cycle times of the accumulated operation of the heater reaches N times, the defrosting is finished, and the system exits the defrosting program.

6. The refrigerator defrosting system according to claim 1, wherein:

setting the heating energy of the heater to be a constant value Q in the basic heating period T_C；

The heating time T of the heater in the basic heating period₁The heat generated internally is Q_C；

Then Q is_C＝(U²/R)·T₁，T₁＝(Q_C·R)/U²；

Wherein, U is the actual voltage value on the heater, and R is the resistance value of the heater.

7. A refrigerator defrosting control method is characterized by comprising a heating time analysis method in a basic heating period, and the method comprises the following steps:

(1) the voltage detection unit detects the mains voltage, namely the actual voltage value U of the heater, to obtain U²A value;

(2) will U²Value and 220V standard voltage U₀ ²The values are compared to obtain the ratio λ, i.e. λ ═ U²/U₀ ²；

(3) Calculating the reciprocal delta of the lambda, namely delta is 1/lambda;

(4) delta and the standard basic heating period T₀Multiplying to obtain the actual heating time T₁，T₁＝δ·T₀。

Technical Field

The invention belongs to the technical field of refrigerator defrosting, and particularly relates to a refrigerator defrosting system and method.

Background

Air-cooled refrigerators are becoming increasingly popular with consumers because they do not require the user to manually defrost. In order to ensure the refrigeration effect of the refrigerator, the air-cooled refrigerator must be defrosted automatically. The defrosting principle of the refrigerator is as follows:

the heater used in the refrigerator is generally a resistance heater, and the heating energy calculation formula of the resistance heater is as follows: q ═ U (U)²/R)·t。

Q: heating value in t time period;

u: the operating voltage of the heater;

r: the resistance of the heater;

t: the operating time of the heater.

Due to instability of mains voltage, U is caused²The actual value of (a) is much different from the design value. The actual heating value and the designed heating value of the heater are different, and finally the defrosting is abnormal. If the actual defrosting power is lower than the designed defrosting power, the defrosting is not thorough, and the refrigerating effect of the refrigerator is influenced; if the actual defrosting power is larger than the designed defrosting power, the instantaneous heating value is too high, the temperature rises quickly, and finally the temperature fuse is disconnected, and the fault needs to be maintained by replacing the heater.

Prior patent document 1(CN105972916A), patent name: the patent specifies two operation powers of a heater, and operates a first power to defrost when a first temperature is reached; operating a second power defrost when a second temperature is reached. However, the defrosting method does not fundamentally solve the problem of large power change caused by unstable mains voltage.

Prior patent document 2(CN108362068B), patent name: a refrigerator defrosting system and a method thereof are disclosed in the patent. However, the hardware circuit is too complex, and the cost is increased more.

In order to solve the problem of defrosting caused by the change of the mains voltage, the following scheme is considered. According to Q ═ U (U)²T, when the mains voltage changes, resulting in U²When the/R changes, the total heating energy of the heater can be ensured to be unchanged as long as the heating time is increased or decreased in opposite directions according to the same proportion. To achieve this, the heater is usedIs designed as a fixed number of time periods consisting of a number of elementary heating cycles. The basic heating period is a basic heating time unit with unfixed time, and consists of heating time and non-heating time, and the heating value of the heater in each basic heating period is the same. When the voltage of the commercial power is increased, the time of the basic heating period is unchanged, and the heating time in the basic heating period is shortened to ensure that the heating value in the basic heating period is unchanged; when the voltage of the commercial power is reduced, the basic heating period time is prolonged, and the heating value in the basic heating period is ensured to be unchanged by prolonging the heating time.

Disclosure of Invention

The invention aims to provide a refrigerator defrosting system and a refrigerator defrosting method, which ensure the constancy of total defrosting energy in a defrosting period, avoid the defrosting problem caused by the inconsistency of design voltage and actual voltage, and simultaneously avoid the fusing accident of a temperature fuse due to the regulation and control of constant heat.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a defrosting system of a refrigerator, wherein a system hardware device comprises an integrated circuit board and a heater, and the defrosting system mainly comprises the following components:

(1) the integrated circuit board is provided with a voltage detection unit, a singlechip and a relay, and the periphery of the evaporator is provided with a heater.

(2) In the defrosting system, the heating time of a heater is periodically divided, and N basic heating periods T are preset;

wherein, in each basic heating period T, the heating energy of the heater is the same; wherein the basic heating cycle is divided into a heating time T₁And a non-heating time T₂。

(3) In the defrosting system, a standard basic heating period T is preset₀；

When the heating time T is₁Less than the standard basic heating period T₀When the basic heating period is equal to the standard basic heating period, i.e. T ═ T₀Time of non-heating T₂＝T₀-T₁；

When the heating time T is₁Not less than the standard basic heating period T₀When the heating time is T, the basic heating period is greater than or equal to the standard basic heating period, the basic heating period only consists of heating time and has no non-heating time₁。

(4) The voltage detection unit detects an actual voltage value at the starting moment of each basic heating period, and the single chip microcomputer calculates the heating time in the current period according to the actual voltage value.

As a preferred technical scheme of the invention, the duration of the basic heating period is 1-20S.

In a preferred embodiment of the present invention, the standard basic heating period is a basic heating period calculated when the standard voltage is 220V.

As a preferred technical scheme of the invention, (1) when the heater is in the heating time period, the singlechip outputs a control signal to enable the relay to be in a conducting state, and the mains supply voltage is connected to the heater for heating; (2) when the heater is in a non-heating time period, the singlechip outputs a control signal to enable the relay to be in a closed state, and the heater is not communicated with the commercial power and is in a non-heating state.

As a preferred technical scheme of the invention, when the heating cycle times of the accumulated operation of the heater reaches N times, the defrosting is finished, and the system exits the defrosting program.

As a preferable technical scheme of the invention, the heating energy of the heater is a constant value Q within the basic heating period T_C(ii) a The heating time T of the heater in the basic heating period₁The heat generated internally is Q_C(ii) a Then Q is_C＝(U²/R)·T₁，T₁＝(Q_C·R)/U²(ii) a Wherein, U is the actual voltage value on the heater, and R is the resistance value of the heater.

The invention relates to a refrigerator defrosting control method, which comprises a heating time analysis method in a basic heating period, and comprises the following steps:

(1) the voltage detection unit detects the mains voltage, namely the actual voltage value U of the heater, to obtain U²A value;

(2) will be provided withU²Value and 220V standard voltage U₀ ²The values are compared to obtain the ratio λ, i.e. λ ═ U²/U₀ ²；

(3) Calculating the reciprocal delta of the lambda, namely delta is 1/lambda;

(4) delta and the standard basic heating period T₀Multiplying to obtain the actual heating time T₁，T₁＝δ·T₀。

The invention has the following beneficial effects:

according to the invention, through periodic heating intervention of non-fixed time on the heater in the refrigerator, constant control of defrosting heating power is realized when actual voltage changes, the constant of total defrosting energy in a defrosting period is ensured, the defrosting problem caused by inconsistency of designed voltage and actual voltage is avoided, and meanwhile, the fusing accident of a temperature fuse is also avoided through constant-heat regulation control.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a hardware driving of a defrosting system according to the present invention;

FIG. 2 is a sequence diagram of N basic heating cycles when defrosting heating is performed according to the present invention;

FIG. 3 is a schematic diagram of heating time and non-heating time included in a basic heating cycle in the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

The invention relates to a defrosting system hardware composition of a refrigerator, which comprises:

the hardware of the invention comprises a voltage detection unit, a singlechip, a relay and a heater, wherein the voltage detection unit, the singlechip and the relay are integrated on a circuit board. The heater is mounted at or near the bottom of the evaporator.

In the defrosting design of the refrigerator, the invention comprises the following steps:

the defrosting heating time of the refrigerator is divided into basic defrosting time with fixed time, and the basic defrosting time is composed of heating time and non-heating time. The heating time and the non-heating time are determined based on the actual voltage value. The heating energy in each basic defrosting time is ensured to be equal to the designed heating energy. Thereby ensuring that the total heating power is equal to the designed heating power.

Based on the above feature content, the substrate heating process of the present invention specifically includes the following steps:

the heating time of the heater is divided into N basic heating periods, the time range of the basic heating periods is not too long, and the condition that the defrosting effect is influenced due to too much heating energy caused by long heating time when the actual voltage is too high is avoided.

The basic heating time can be controlled within 1-20S, and the heating energy of the heater in each basic heating period is the same.

Setting the heating energy of the heater to be a constant value Q in the basic heating period T_C(ii) a The heating time T of the heater in the basic heating period₁The heat generated internally is Q_C(ii) a Then Q is_C＝(U²/R)·T₁，T₁＝(Q_C·R)/U²(ii) a Wherein, U is the actual voltage value on the heater, and R is the resistance value of the heater. The basic heating period calculated from the standard voltage of 220V is referred to as a standard basic heating period.

The invention carries out periodic regulation and control on the heater through the singlechip, and the specific content is as follows:

the basic heating cycle of the heater is an unfixed time period and is divided into a heating time and a non-heating time. In the heating time, the singlechip outputs a control signal to enable the relay to be in a conducting state, and the mains supply voltage is connected to the heater for heating. In the non-heating time, the singlechip outputs a control signal to enable the relay to be in a closed state, and the heater is not communicated with the commercial power and is in a non-heating state.

The heating time is calculated by a singlechip. And when the calculated heating time is less than the standard basic heating period, the basic heating period is equal to the standard basic heating period, the heating time is the calculated heating time, and the non-heating time is the difference of the sum. When the calculated heating time t1 is greater than or equal to the standard basic heating period, the basic heating period is greater than or equal to the standard basic heating period, at this time, the basic heating period only consists of the heating time, no non-heating time exists, and the heating time is the calculated heating time.

In the actual defrosting process, the voltage detection unit detects the actual voltage value at the beginning of each basic heating period, and the single chip microcomputer calculates the heating time in each basic heating period according to the actual voltage value. When the accumulated basic heating period number is equal to N, defrosting is finished, and the defrosting program is quitted.

In the invention, the method for calculating the heating time in the basic heating period by the singlechip comprises the following steps:

1. obtaining U according to the commercial power voltage U detected by the voltage detection circuit²The value is obtained.

2. Will U²Value and standard voltage (220V) U₀ ²Comparing the values to obtain a value λ, i.e. λ ═ U²/U₀ ²。

3. The inverse of λ, i.e., δ is 1/λ, is calculated.

4. Delta and the standard basic heating period T₀Multiplying to obtain the actual heating time T₁，T₁＝δ·T₀。

In the description herein, references to the terms "embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, 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 of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.