CN2821987Y - Leakage protective circuit of air conditioner - Google Patents
Leakage protective circuit of air conditioner Download PDFInfo
- Publication number
- CN2821987Y CN2821987Y CN 200520064631 CN200520064631U CN2821987Y CN 2821987 Y CN2821987 Y CN 2821987Y CN 200520064631 CN200520064631 CN 200520064631 CN 200520064631 U CN200520064631 U CN 200520064631U CN 2821987 Y CN2821987 Y CN 2821987Y
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- China
- Prior art keywords
- leakage
- air conditioner
- current
- protection circuit
- capacitor
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- Expired - Lifetime
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- Air Conditioning Control Device (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a leakage protection circuit of an air conditioner, which belongs to the field of electronics, and comprises a DC source part, a current detecting part, a current processing part and a current amplifying and rectifying part. No matter whether a power supply source has a ground wire or not, the leakage protection circuit uses an air conditioner casing which is grounded as an integral leakage reflux path. When electrical leakage takes place, leakage current is detected by an AC leakage detector and then transferred to an air conditioner controller after processed by the leakage protection circuit. When the current value of the electrical leakage exceeds a setting value, the controller cuts off the power supply source so as to prevent the air conditioner casing from being continuously charged and causing harm to a human body. The utility model has the advantages that the leakage protection circuit can detect the electrical leakage in time when the air conditioner is under the condition of electrical leakage, electrical leakage signal is then transferred to the controller to cut off the power supply source and the phenomenon that the air conditioner casing continuously has dangerous voltage is effectively eliminated.
Description
Technical field
The utility model relates to a kind of leakage protection circuit, particularly a kind of air conditioner leakage protection circuit.
Background technology
The general requirement of now general earth leakage protective device is: break-time is 10ms, and operating current is 30mA; But human body is 0.5mA, let-go current threshold values 10mA to the sensory current threshold values of 50HZ.From above parameter as can be seen: also have one section blind area of 10mA～30mA, general earth leakage protective device does not have action to this, but human body is in peril of one's life again.Simultaneously, RCD all has the problem of a sensitivity, and is highly sensitive, easily causes misoperation; Sensitivity is low, and is slow in one's movements.And the electric shock of moment also may cause the human injury, perhaps owing to the electric shock that is subjected to moment causes other more serious consequences.
The operating principle of earth leakage protective device is: human electric shock's electric current will form the loop by protected circuit and the earth just can make the earth leakage protective device action message.Leak electricity at electrical equipment, during outer casing electrification, stand in when touching electric appliance casing generation electric shock accidents on the insulator, make earth leakage protective device to move because of shock current can't flow back to through the earth as the people.From the principle of dropout type electronic leakage protector as can be known; when supply line's voltage is lower than the required minimum operating voltage of its internal electron; earth leakage protective device can not move equally, and this moment, supply power voltage still was higher than the safe voltage of human body probably, and casualty accident equally may shock by electricity.
Summary of the invention
The utility model provides when electric leakage takes place air conditioner, when leakage current value surpasses set point, and the air conditioner leakage protection circuit that can cut off the electricity supply automatically.This leakage protection circuit utilizes air conditioner housing to link to each other with the earth as a complete electric leakage backflow approach; when leakage current surpasses set point; can cut off the electricity supply immediately; it is charged to avoid air conditioner casing to continue; avoid not having special-purpose ground wire or the neutral line and disconnect, the earth fault or the electric shock casualty accident that take place during earth leakage protective device self is not worked or akinesia in particular cases etc. causes air conditioner electric leakage because of electric power system.
The purpose of this utility model is achieved in that the air conditioner leakage protection circuit; comprise the DC power supply part; the current detecting part; the current processing part; electric current amplifies rectifying part; described electric current amplifies rectifying part and comprises amplifying circuit and rectification circuit; described amplifying circuit is by resistance R 1; R2; R3 and amplifier tube Q1 are composed in series; described rectification circuit is by capacitor C 2; C3 and rectifying tube D3 form; capacitor C 2 one ends connect amplifying circuit; the other end is connected with rectifying tube D3; capacitor C 3 one end ground connection, the other end and the port J2 that is connected to the air conditioner central controller after rectifying tube D3 is connected.
Its second is characterised in that described current detecting part is divided into an ac leakage current sensor, the elementary connection power line of this ac leakage current sensor.
Its 3rd is characterised in that: described current processing part is made up of pressure limiting pipe D1, D2 and capacitor C 1, described pressure limiting pipe D1, D2 are connected in the two ends of ac leakage current sensor in parallel, capacitor C 1 one ends are connected with pressure limiting pipe D2, and the other end has connected amplifying circuit.
The utility model has the advantages that: 1, when electric leakage takes place air conditioner, leakage protection circuit can in time detect electric leakage, and electric leakage signal is passed to controller, if leakage current value surpasses set point, controller is cut off the electricity supply, and effectively eliminates the phenomenon that air conditioner casing continues to have dangerous voltage; 2, have only after dangerous voltage surpasses set point and just can cut off circuit, within safety is enclosed, do not cut off circuit, both can keep the normal operation of air conditioner, can effectively prevent the electric shock phenomenon of leaking electricity human body being caused again.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
According to shown in Figure 1, the controller of air conditioner provides DC power supply (1) for the amplifying circuit in the leakage protection circuit.After air conditioner connected the 220V alternating current, the elementary of ac leakage current sensor (2) was connected on the power line, constantly the electric current that flows through detected.When leaky takes place, air conditioner casing has electrical leakage voltage, this electricity leaks electricity to the earth through shell, produce leakage current, ac leakage current sensor (2) detects leakage current, ac leakage current sensor (2) two ends have electrical leakage voltage, and this voltage behind the direct current component, passes to amplifying circuit through pressure limiting pipe D1 (3), D2 (4) pressure limiting, capacitor C 1 (5) in power down is pressed.After amplifier tube Q1 (8) amplification of electrical leakage voltage through amplifying circuit, pass to capacitor C 2 (10) direct current component in power down is pressed once more, after passing to rectifying tube D3 (11) rectification and capacitor C 3 (12) filtering at last, pass to the central controller interface J2 (13) of air-conditioning, after central controller is received signal, judge whether leakage current value surpasses set point, if leakage current value does not surpass set point, then controller is failure to actuate, and air conditioner continues operate as normal; If leakage current value surpasses set point, controller is cut off the electricity supply, and air conditioner quits work, and has avoided air conditioner casing to continue the charged harm that human body is produced.
What need indicate is that any change or components and parts replacement that does not relate to the basic circuit connected mode that the related personnel makes the utility model also belongs to protection range of the present utility model.
Claims (3)
1; the air conditioner leakage protection circuit; comprise DC power supply part (1); current detecting part (2); the current processing part; it is characterized in that: described air conditioner comprises also that with leakage protection circuit electric current amplifies rectifying part; described electric current amplifies rectifying part and comprises amplifying circuit and rectification circuit; described amplifying circuit is by resistance R 1 (6); R2 (7); R3 (9) and amplifier tube Q1 (8) are composed in series; described rectification circuit is by capacitor C 2 (10); C3 (12) and rectifying tube D3 (11) form; capacitor C 2 (10) one ends connect amplifying circuit; the other end is connected with rectifying tube D3 (11); capacitor C 3 (12) one end ground connection, the other end and the port J2 (13) that is connected to the air conditioner central controller after rectifying tube D3 (11) is connected.
2, air conditioner leakage protection circuit according to claim 1 is characterized in that: described current detecting part (2) is an ac leakage current sensor, the elementary connection power line of this ac leakage current sensor.
3, air conditioner leakage protection circuit according to claim 1; it is characterized in that: described current processing part is made up of pressure limiting pipe D1 (3), D2 (4) and capacitor C 1 (5); described pressure limiting pipe D1 (3), D2 (4) are connected in the two ends of ac leakage current sensor (2) in parallel; capacitor C 1 (5) one end is connected with pressure limiting pipe D2 (4), and the other end has connected amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520064631 CN2821987Y (en) | 2005-09-15 | 2005-09-15 | Leakage protective circuit of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520064631 CN2821987Y (en) | 2005-09-15 | 2005-09-15 | Leakage protective circuit of air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2821987Y true CN2821987Y (en) | 2006-09-27 |
Family
ID=37018538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520064631 Expired - Lifetime CN2821987Y (en) | 2005-09-15 | 2005-09-15 | Leakage protective circuit of air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2821987Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320246A (en) * | 2011-06-30 | 2012-01-18 | 奇瑞汽车股份有限公司 | Safety control system for air conditioner of electric vehicle and control method thereof |
| CN102931645A (en) * | 2011-08-09 | 2013-02-13 | 珠海格力电器股份有限公司 | Ground wire live protection circuit and method and air conditioner provided with circuit |
| CN104879900A (en) * | 2015-06-09 | 2015-09-02 | 珠海格力电器股份有限公司 | Monitoring method, device and set of air conditioner |
-
2005
- 2005-09-15 CN CN 200520064631 patent/CN2821987Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320246A (en) * | 2011-06-30 | 2012-01-18 | 奇瑞汽车股份有限公司 | Safety control system for air conditioner of electric vehicle and control method thereof |
| CN102931645A (en) * | 2011-08-09 | 2013-02-13 | 珠海格力电器股份有限公司 | Ground wire live protection circuit and method and air conditioner provided with circuit |
| CN102931645B (en) * | 2011-08-09 | 2016-03-30 | 珠海格力电器股份有限公司 | Ground wire live protection circuit, method and there is the air conditioner of this circuit |
| CN104879900A (en) * | 2015-06-09 | 2015-09-02 | 珠海格力电器股份有限公司 | Monitoring method, device and set of air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20060927 |
|
| EXPY | Termination of patent right or utility model |