CN1033498A - Safety circuit for electrical appliance's outer casing with electricity - Google Patents
Safety circuit for electrical appliance's outer casing with electricity Download PDFInfo
- Publication number
- CN1033498A CN1033498A CN 87103467 CN87103467A CN1033498A CN 1033498 A CN1033498 A CN 1033498A CN 87103467 CN87103467 CN 87103467 CN 87103467 A CN87103467 A CN 87103467A CN 1033498 A CN1033498 A CN 1033498A
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- circuit
- resistance
- capacitor
- transistor
- electricity
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- Relay Circuits (AREA)
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Abstract
Safety circuit for electrical appliance's outer casing with electricity, it is made up of signal step-down rectifying circuit, switching circuit, control circuit, warning circuit and DC power supply five parts.It can cut off appliances power source when surpassing safe voltage automatically in that electric appliance casing is charged.Send chimes of doom simultaneously.Need not to distinguish live wire and zero line during installation.All components and parts can be assembled in 4 * 10 centimetres of a slices
2Printed panel on, in the various electrical equipment of can packing into.
Description
This invention is a safety circuit for electrical appliance's outer casing with electricity.
At present, also be provided with a kind of ball bearing made using, can when electric appliance casing is charged, cut off the electricity supply automatically.Chinese patent ZL85203036 is a kind of earth leakage protective plug-in unit, and the structure more complicated is installed and also will be differentiated live wire and zero line.Chinese patent ZL85203258 is the charged audible-visual annunciator of a kind of micro magnetic electric appliance casing, and it has warning function, no automatic protection functions.
Task of the present invention provides a kind of simple, and cost is low, can cut off the electricity supply automatically when surpassing safe voltage in that electric appliance casing is charged, sends chimes of doom simultaneously, need not to recognize the safety circuit for electrical appliance's outer casing with electricity of live wire and zero line during installation.
Safety circuit for electrical appliance's outer casing with electricity, it is made up of signal step-down rectifying circuit, switching circuit, control relay circuit, warning circuit and DC power supply.Wherein use resistance R
1, capacitor C
1, diode D
1Series connection.Diode D
2Negative pole is connected on capacitor C
1With diode D
1Between, its positive pole with link to each other publicly.Resistance R
2And capacitor C
2And be connected in transistor BG
1Base stage and public ground between.Resistance R
1, R
2, capacitor C
1, C
2, diode D
1, D
2Form the signal step-down rectifying circuit, as the input of switching circuit.The same resistance R of its coil of relay J
3Series connection is at positive source and transistor BG
1Collector electrode between.Transistor BG
2The base stage of collector electrode allomeric pipe link to each other, its emitter passes through resistance R
4Be connected with positive source.By transistor BG
3, BG
4Form warning circuit and be connected on positive source and transistor BG
1Between the collector electrode.Diode D
5, D
6, D
7, D
8Form bridge rectifier.The main distinction of this circuit is characterised in that capacitor C
4, C
5Same respectively resistance R
8, R
9Compose in parallel symmetrical reduction voltage circuit.Capacitor C
4, C
5, resistance R
8, R
9With diode D
5, D
6, D
7, D
8Form this circuit dc power.Use resistance R
1An end be connected with electric appliance casing, with electric appliance casing as input.Capacitor C wherein
4, C
5, resistance R
8, R
9The reduction voltage circuit of forming can also be with a transformer, capacitor C
5Be connected on the former limit of transformer and pay between the limit and replace.Perhaps use a transformer, two diodes replace, and these two its negative poles of diode are connected on two inputs of civil power 220V respectively, the anodal public ground that is connected on this circuit simultaneously.Transformer is input as 220V and exchanges, and is output as 10V and exchanges.Capacitor C
4, C
5Capacity is 1 μ f/400V.Resistance R
1Between 200～500K Ω, select.Two diodes are rectifier diode, and are withstand voltage greater than 600V.
The advantage of safety circuit for electrical appliance's outer casing with electricity of the present invention and effect are that circuit is simple.The whole components and parts of entire circuit can be assembled in a slice 4 * 10cm
2Printed panel on.About 6 yuan of cost can be put among the electrical equipment.Need not to recognize live wire and zero line during installation.Can reliably cut off the electricity supply when surpassing safe voltage in that electric appliance casing is charged.This circuit sensitivity height is in the charged resistance R that causes of electric appliance casing
1The upper reaches overcurrent is during greater than 60 microamperes, and this circuit can move reliably.When electric appliance casing was not charged, this circuit did not have misoperation.
Solution of the present invention, available the following drawings is elaborated.
Fig. 1 is a frame circuit diagram of the present invention
Fig. 2 is the line map of circuit of the present invention
Fig. 2 is the preferred plan of the designed safety circuit for electrical appliance's outer casing with electricity of the present invention, its note is made A here.
This circuit A comprises by 5 partial circuits shown in Figure 1 and forming.Resistance R
1, R
2, capacitor C
1, C
2With diode D
1, D
2Form the signal step-down rectifying circuit, be connected in the input circuit of switching circuit.Resistance R
1An end be connected the same capacitor C of the other end with electric appliance casing
1Link to each other.Capacitor C
1Positive pole with diode D
1Positive pole and diode D
2Negative pole link to each other.Diode D
1Negative pole be connected on transistor BG
1Base stage on.Resistance R
2One end and capacitor C
2Positive pole be connected and be connected on transistor BG simultaneously
1Base stage on, their other end with link to each other publicly.Transistor BG
1, BG
2Form switching circuit.The same resistance R of its coil of relay J
3Series connection is at positive source and transistor BG
1Collector electrode between.Transistor BG
2Base stage be connected on resistance R
3And between the relay J, its collector electrode allomeric pipe BG
1Base stage link to each other, its emitter passes through resistance R
4Link to each other with positive source.Relay J is formed control relay circuit, and a pair of normally closed interlock of relay is used for the input of control apparatus power supply.Transistor BG
3, BG
4Form warning circuit, be connected transistor BG
1Collector electrode and positive source between.Capacitor C
4, C
5Same respectively resistance R
8, R
9Compose in parallel symmetrical reduction voltage circuit, a pair of input is connected on the civil power 220V, and another is same by diode D to output
5, D
6, D
7, D
8The full-bridge type stream device of forming links to each other.
Among this circuit A, capacitor C
4, C
5Same respectively resistance R
8, R
9The symmetrical reduction voltage circuit that composes in parallel can be with a transformer and capacitor C
5Be connected on the former limit of transformer and pay between the limit and replace.Perhaps use a transformer and two diodes, two diodes are born connect the input that is connected on civil power 220V respectively, its positive pole replaced with linking to each other of circuit A publicly, and its effect is the same.
The work of this circuit A is such: because resistance R among the circuit A
1Be connected with electric appliance casing, the DC power supply of circuit A has adopted the capacitance decompression mode, then when electric appliance casing is charged, will produce ac voltage signal between the input of circuit A and the public ground.The signal step-down rectifying circuit becomes positive half cycle signal with this alternating voltage and is sent to transistor BG
1Base stage.The current potential that makes transistor base and public ground at this signal is during greater than 0.7 volt, transistor BG
1Conducting makes the relay J coil electricity, and appliances power source is cut off in the contact action.This moment transistor BG
2Because of resistance R
3On voltage drop is arranged and conducting, and transistor BG
2Conducting make transistor BG
1Keep conducting state.Because transistor BG
1Conducting, the power supply of warning circuit is switched on, and the buzzer in the warning circuit sends the sound.
This circuit A, its resistance R
1Be 500K, resistance R
2Be 10K Ω, diode D
1, D
2Be 2cp type, capacitor C
1Be 3 μ f/6V capacitor C
4, C
5Be 1 μ f/400V, transistor BG
1Be 3DG12, BG
2Be 3A * 3L, BG
3, BG
4Be 3DG6.
Claims (4)
1, safety circuit for electrical appliance's outer casing with electricity, it is by the signal step-down rectifying circuit, switching circuit, control relay circuit, warning circuit and DC power supply are formed, wherein resistance R
1, R
2, capacitor C
1, C
2, diode D
1, D
2Form of the input of signal step-down rectifying circuit, the same resistance R of its coil of relay J as switching circuit
3Series connection is at positive source and transistor BG
1Collector electrode between, transistor BG
2Collector electrode allomeric pipe BG
1Base stage link to each other transistor BG
2Emitter pass through resistance R
4Be connected with positive source, by transistor BG
3, BG
4Form warning circuit and be connected on positive source and transistor BG
1Collector electrode between, diode D
5, D
6, D
7, D
8Form bridge rectifier, the feature of this circuit is:
A, for when electric appliance casing is charged, can between the input of circuit A and its public ground, form triggering signal and adopt capacitor C
4, C
5Same respectively resistance R
8, R
9Compose in parallel symmetrical reduction voltage circuit,
B, the input of electric appliance casing as this circuit A, use resistance R
1An end be connected with electric appliance casing,
C, capacitor C
4, C
5Capacity is set at 1 μ f, and is withstand voltage for exchanging 400 volts, resistance R
1Resistance between 200～500K Ω, select.
2,, it is characterized in that with transformer and capacitor C according to the described safety circuit for electrical appliance's outer casing with electricity of claim 1
3Be connected on the former limit of this transformer and pay between the limit and replace capacitor C
4, C
5Resistance R
8, R
9The symmetrical reduction voltage circuit of forming.
3, according to the described safety circuit for electrical appliance's outer casing with electricity of claim 2, it is characterized in that with two diodes, its negative pole is connected with two inputs of civil power 220V respectively, its positive pole links to each other with this circuit publicly and replaces capacitor C
5
4, it is characterized in that according to the described safety circuit for electrical appliance's outer casing with electricity of claim 3 two diodes are withstand voltage greater than exchanging 600V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87103467 CN1008035B (en) | 1987-05-09 | 1987-05-09 | Safety circuit for electrical appliance's outer casing with electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87103467 CN1008035B (en) | 1987-05-09 | 1987-05-09 | Safety circuit for electrical appliance's outer casing with electricity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1033498A true CN1033498A (en) | 1989-06-21 |
| CN1008035B CN1008035B (en) | 1990-05-16 |
Family
ID=4814448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87103467 Expired CN1008035B (en) | 1987-05-09 | 1987-05-09 | Safety circuit for electrical appliance's outer casing with electricity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1008035B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988662A (en) * | 2018-07-18 | 2018-12-11 | 青岛海信日立空调系统有限公司 | A kind of substrate circuit and control method |
-
1987
- 1987-05-09 CN CN 87103467 patent/CN1008035B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988662A (en) * | 2018-07-18 | 2018-12-11 | 青岛海信日立空调系统有限公司 | A kind of substrate circuit and control method |
| CN108988662B (en) * | 2018-07-18 | 2020-06-19 | 青岛海信日立空调系统有限公司 | Substrate circuit and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1008035B (en) | 1990-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |