JPS5694142A - Frosting detecting device for freezer - Google Patents
Frosting detecting device for freezerInfo
- Publication number
- JPS5694142A JPS5694142A JP17230679A JP17230679A JPS5694142A JP S5694142 A JPS5694142 A JP S5694142A JP 17230679 A JP17230679 A JP 17230679A JP 17230679 A JP17230679 A JP 17230679A JP S5694142 A JPS5694142 A JP S5694142A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- fan motor
- value
- current
- reference value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Defrosting Systems (AREA)
Abstract
PURPOSE: To enable a frosting detection with a high accuracy by detecting the current or power of a fan motor attached to an air heat exchanger with a cooling function, comparing the detected value with a reference value, and providing a defrosting command signal on the basis of the comparison result.
CONSTITUTION: The current of the fan motor attached to the air heat exchanger within a refrigerant circuit is detected by an ammeter 19, the output signal of which is sent to a voltage signal converter 20, rectifying and smoothing circuit 21, and A/D converter 22, where the output signal is converted into a digital signal corresponding to the fan motor current. Then, the digital signal is inputted into an integrating device 28 within a controller 27. On the other hand, the output signal from a transformer 23 which decreases the voltage across the fan motor is also converted into a digital signal and inputted into the integrating device 28. The integrating device 28 integrates these inputs to obtain an apparent power value. A comparator 30 compares the apparent power value with a reference value stored in a memory 29, and when a condition that the integrated value is higher than the reference value continues for a predetermined period of time, provides a signal to operate a delay timer 31 to generate an output for actuating a defrosting device 34.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17230679A JPS5694142A (en) | 1979-12-27 | 1979-12-27 | Frosting detecting device for freezer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17230679A JPS5694142A (en) | 1979-12-27 | 1979-12-27 | Frosting detecting device for freezer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5694142A true JPS5694142A (en) | 1981-07-30 |
Family
ID=15939469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17230679A Pending JPS5694142A (en) | 1979-12-27 | 1979-12-27 | Frosting detecting device for freezer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5694142A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58142174A (en) * | 1982-02-18 | 1983-08-23 | 日産自動車株式会社 | Preventive device for freezing of evaporator |
| JPWO2015145714A1 (en) * | 2014-03-28 | 2017-04-13 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
| CN111947349A (en) * | 2019-05-14 | 2020-11-17 | 广东万博电气有限公司 | Defrosting control method, defrosting control system and air source heat pump device |
-
1979
- 1979-12-27 JP JP17230679A patent/JPS5694142A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58142174A (en) * | 1982-02-18 | 1983-08-23 | 日産自動車株式会社 | Preventive device for freezing of evaporator |
| JPWO2015145714A1 (en) * | 2014-03-28 | 2017-04-13 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
| US10222108B2 (en) | 2014-03-28 | 2019-03-05 | Hitachi-Johnson Controls Air Conditioning, Inc. | Air conditioner |
| CN111947349A (en) * | 2019-05-14 | 2020-11-17 | 广东万博电气有限公司 | Defrosting control method, defrosting control system and air source heat pump device |
| CN111947349B (en) * | 2019-05-14 | 2023-05-12 | 广东万和电气有限公司 | Defrosting control method, defrosting control system and air source heat pump device |
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