CN87211404U - Protecting switch for overvoltage and electricity leakage - Google Patents
Protecting switch for overvoltage and electricity leakage Download PDFInfo
- Publication number
- CN87211404U CN87211404U CN 87211404 CN87211404U CN87211404U CN 87211404 U CN87211404 U CN 87211404U CN 87211404 CN87211404 CN 87211404 CN 87211404 U CN87211404 U CN 87211404U CN 87211404 U CN87211404 U CN 87211404U
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- CN
- China
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- circuit
- overvoltage
- voltage
- resistance
- switch
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Abstract
The utility model relates to a protecting switch for over-voltage and electricity leakage, which belongs to a safety protector for household appliances. The utility model is composed of an over-voltage testing circuit, an electric leakage testing circuit, an execution mechanism, etc. The utility model is characterized in that the over-voltage testing circuit which is arranged in the protecting switch is composed of a voltage dependent resistor Ru, a resistor R-[1] and zero sequence current transformer coils Lo which are connected in series, the nominal voltage value of the voltage dependent resistor Ru is bigger than the value of the action voltage which is needed for protection, and the discharge current capacity of the voltage dependent resistor Ru meets the requirements of the heat dissipation power; when the over-voltage or leakage current reaches the protection action value, the execution mechanism acts to quickly cut off the power supply to protect the personal safety and the household appliances from being burnt.
Description
The utility model belongs to a kind of improved household electrical appliance safety protection switch.
Household electrical appliance protection switch kind is a lot of at present; function is different; but the protection switch that possesses overvoltage protection and two functions of earth leakage protective simultaneously is very few, even this product is arranged, also is that circuit complexity, cost height, self energy consumption are big, weak points such as low precision, stability and less reliable.
The purpose of this utility model provides a kind of low energy consumption, accurate reliable, simple, the cheap difunctional overvoltage earth leakage circuit-breaker of circuit.
Accompanying drawing is an embodiment of the present utility model, below in conjunction with accompanying drawing operation principle of the present utility model and implementation method is described in detail.
Shown in Figure 1 is block diagram of the present utility model
Shown in Figure 2 is circuit diagram of the present utility model
Symbolic representation among the figure:
The 1-insulation crust, 2-switch, 3-rectification circuit, 4-hookup, 5-overvoltage detection circuit, 6-electric-leakage detection circuit, 7-filtering amplitude limiter circuit, 8-power amplification circuit, 9-actuator.
The K-switch, the KT-tripping mechanism, KS-tests contact, the PB-test button, B-zero sequence converter, L0, L1, L2, L3-zero sequence converter coil, Ru, Ru1-piezo-resistance, the SCR-controllable silicon, the G-silicon controlled control utmost point, Z-rectifying block, D1, D2, D3, D4-diode, the RS-test resistance, R1, R2-resistance, C1, C2-capacitor.
The utility model is made up of with the switch 2 that becomes to be electrically connected, rectification circuit 3, hookup 4, overvoltage detection circuit 5, electric-leakage detection circuit 6, filtering amplitude limiter circuit 7, power amplification circuit 8, actuator 9 insulation crust 1.Rectification circuit 3 is selected rectifying block Z for use, and hookup 4 is made up of test button PB, test contact KS and test resistance RS.Overvoltage detection circuit 5 is made up of piezo-resistance Ru, resistance R 1 and zero sequence converter coil L0.Electric-leakage detection circuit 6 is made up of zero sequence converter coil L1, L2, L3.Filtering amplitude limiter circuit 7 is made up of capacitor C1, C2, resistance R 2, diode D1, D2, D3, D4.Power amplification circuit 8 is made up of controllable silicon SCR and piezo-resistance RU1, and actuator 9 is made of tripping mechanism KT.The concrete line of above circuit is seen Fig. 2.
The operation principle of overvoltage earth leakage circuit-breaker is to utilize overvoltage or leakage current to trigger controllable silicon SCR, and excitation tripping mechanism KT, causes K switch tripping operation outage.
Under normal circumstances, promptly overvoltage is not under the situation of leakproof yet, and when K switch was closed, the resistance of piezo-resistance Ru was very big, and the electric current of the coil L0 of resistance R of flowing through 1 and zero sequence converter very little (about 1 milliampere) is so zero sequence unsteady flow coil L3 induced current not; If any load, load current flow through two the coil L1 and the L2 of zero sequence converter, current opposite in direction in these two coils, amplitude equates, so also induced current not among the coil L3 of zero sequence converter, the control utmost point G of controllable silicon SCR is the triggerless electric current also, therefore controllable silicon SCR can not conducting, the tripping mechanism KT of K switch is not energized yet, and K switch is kept closed, and powers to the load.
When overvoltage reaches the voltage protection operating value; because the resistance of piezo-resistance Ru suddenly subtracts greatly; the electric current of R1 and L0 of flowing through suddenly heightens; suddenly heighten with the electric current difference of flow through zero sequence converter coil L1 and L2; cause the induced current of zero sequence converter coil L3 also suddenly to heighten; and through capacitor C1; C2 resistance R 2 and diode D1; D2D3; electric current to the gate pole G of controllable silicon SCR behind the D4 filtering amplitude limit also increases suddenly; cause the controllable silicon SCR conducting; electric current from the direct current anode (+) of rectifying block Z through controllable silicon SCR and tripping mechanism KT direct current negative terminal (-) to rectifying block Z; tripping mechanism KT is energized; the K switch tripping operation, the insantaneous break power supply.When leakage current reached the operating value of design, the electric current difference of zero sequence converter coil L1 and L2 just reached and makes the electric current of inducting among the coil L3 be enough to make the controllable silicon SCR conducting, thereby tripping mechanism KT is energized, the K switch tripping operation.This shows that when no matter overvoltage or leakage current reached the operating value of protection, all tripping operations in 0.1 second of K switch were not damaged to guarantee personal safety and equipment.
Whether good test button PB be this protection switch of customer inspection performance device; when test button PB presses; test contact KS closure; electric current process test resistance RS is promptly arranged and the zero line that arrives (neutral ground of three-phase and four-line formula); this moment, the difference between current of zero sequence converter coil L1 and L2 was very big, and the induced current of L3 is also very big, causes the controllable silicon SCR conducting; tripping mechanism KT is energized, and the K switch tripping operation is cut off the electricity supply.The resistance of test resistance RS, i.e. the Minimum Acceptable Value of analog subscriber circuit insulation.
Across the piezo-resistance Ru1 at controllable silicon SCR two ends, whether the concrete parameter of looking the controllable silicon SCR that adopts needs protection and decides what to use.
The characteristic of piezo-resistance Ru is for when applied voltage surpasses its nominal voltage, and resistance value significantly reduces, and utilizes its this nonlinear characteristic to make overvoltage protection.The nominal voltage value of this piezo-resistance Ru should be greater than operation voltage value required for protection, and its discharge capacity should meet the requirement of dissipation power.
Resistance R 1 is the current-limiting resistance in the excess voltage protection.This resistance R 1 is when overvoltage protection is failure to actuate, and the electric current that flows through wherein should not surpass 1 milliampere, can bear surge current in short-term when overvoltage protection is moved, and for easy to adjust, resistance R 1 also can adopt variable resistor.
Zero sequence converter coil L0 act as: improve the sensitivity of zero sequence converter, to reduce the power consumption of piezo-resistance Ru.The number of turns of this coil L0 should make the sensitivity of overvoltage protection operating value reach positive and negative 2 volts, and its line is through bearing surge current in short-term.
In sum, overvoltage detection circuit 5 of the present utility model can be used for adopting other earth leakage circuit-breakers of zero sequence converter.
The novel advantage of this use is: oneself power consumption is low; when voltage during at 220 volts; one day power consumption is less than 6/1000ths degree; because of adopted this new unit of piezo-resistance Ru as over-voltage protection element and on zero sequence converter B coiling L0; so circuit is simple; cheap, overvoltage protection is accurately reliable, and the overvoltage protection value can reach positive and negative 2 volts. In addition, overvoltage detection circuit 5 of the present utility model can be used for adopting other earth leakage circuit-breakers of zero sequence converter.
Claims (1)
1, a kind of overvoltage earth leakage circuit-breaker that is used for household electrical appliance is made up of with the switch 2 that becomes to be electrically connected, rectification circuit 3, hookup 4, electric-leakage detection circuit 6, filtering amplitude limiter circuit 7, power amplification circuit 8, actuator 9 insulation crust 1; It is characterized in that having in this protection switch a zero sequence converter that utilizes that is connected in the circuit to detect the overvoltage detection circuit 5 of overvoltage signal, this circuit is by piezo-resistance R
u, resistance R 1 and zero sequence converter coil LO be composed in series its piezo-resistance R
uThe nominal voltage value; should be greater than operation voltage value required for protection; its discharge capacity should meet the requirement of dissipation power; the two ends cross-over connection of this circuit is between phase line and zero line; when overvoltage reaches the overvoltage protection operating value of this protection switch; tripping mechanism KT action causes the K switch tripping operation, the insantaneous break power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87211404 CN87211404U (en) | 1987-07-28 | 1987-07-28 | Protecting switch for overvoltage and electricity leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87211404 CN87211404U (en) | 1987-07-28 | 1987-07-28 | Protecting switch for overvoltage and electricity leakage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87211404U true CN87211404U (en) | 1988-08-17 |
Family
ID=4826221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87211404 Ceased CN87211404U (en) | 1987-07-28 | 1987-07-28 | Protecting switch for overvoltage and electricity leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87211404U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362359C (en) * | 2001-12-21 | 2008-01-16 | Bsh博施及西门子家用器具有限公司 | Method for checking the electrical safety of a household appliance, and corresponding household appliance |
| CN101291051B (en) * | 2007-04-19 | 2012-09-19 | 三菱电机株式会社 | Circuit breaker |
-
1987
- 1987-07-28 CN CN 87211404 patent/CN87211404U/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362359C (en) * | 2001-12-21 | 2008-01-16 | Bsh博施及西门子家用器具有限公司 | Method for checking the electrical safety of a household appliance, and corresponding household appliance |
| CN101291051B (en) * | 2007-04-19 | 2012-09-19 | 三菱电机株式会社 | Circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CU02 | Correction of gazette and description of patent for utility model |
Correction item: Applicant Correct: Li Jiquan False: Li Ji Number: 33 Page: 98 Volume: 4 |
|
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |