CN2393241Y - Multifunction self-resetting safety fuse - Google Patents
Multifunction self-resetting safety fuse Download PDFInfo
- Publication number
- CN2393241Y CN2393241Y CN 99234081 CN99234081U CN2393241Y CN 2393241 Y CN2393241 Y CN 2393241Y CN 99234081 CN99234081 CN 99234081 CN 99234081 U CN99234081 U CN 99234081U CN 2393241 Y CN2393241 Y CN 2393241Y
- Authority
- CN
- China
- Prior art keywords
- thermistor
- circuit
- triode thyristor
- bidirectional triode
- runback
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a multifunction self-resetting protecting device which is used in a power supply circuit with 220V and is composed of a box body (5), a thermistor (1), a piezoresistor (2), a bidirectional thyristor (3) and a small-size alternating current relay (4), wherein, the thermistor (1) is connected with a main return circuit in series and is used as a contactless self-resetting switch for automatic switching-off in a heating state and automatic switching-on in a cooling state. The piezoresistor (2) is a picking element of the overpressure signals and is connected with the control electrode of the bidirectional thyristor (3). The catelectrode and the anode of the bidirectional thyristor (3) are connected with the output terminal of the circuit in parallel. The fuse providing with the structure is adopted to be directly arranged on the inlet opening of the power supply to realize the functions of short-circuit protection, overpressure protection and electrical quantity limit.
Description
The utility model relates to a kind of 220 volts of protective devices in the supply line that are applied to, the especially multi-functional runback protector of being made up of electronic component and shell.
By the fire that electrical equipment causes, be that wire short-circuiting causes basically.The lead alloy fuse that sell in the shop insures and single-phase air circuit, is used for the short-circuit protection of electric wire, is two kinds of the most basic safeguard measures that people take.Yet, the user in use, the fuse that connects is not inconsistent requirement (also not getting rid of possibility of at will looking for joint copper cash or an aluminum steel to substitute) or air circuit because of use for a long time, actuating mechanism is malfunctioning, after this is wire short-circuiting, key factor that can not the instantaneous trip main power source.Though people repeatedly improve air circuit, all be unable to do without movable part is set, thereby the protection effect is undesirable all the time.
Superpressure input (the three-phase four-wire power supply net neutral line is disconnected) appears during household electrical appliances use unavoidably.The lighter, protection action in the machine, blown fuse; Weight person damages element, machinery equipment.And for the user who keeps in repair the layman, even the simplest fault also need be sent and repair, reality does not play much protective effects.
The limit power supply is the effective measures that the power department planned power consumption are taked.And used electric weight automatic controller is made up of current circuit excessively and the actuator that electronic component constitutes, and its device construction complexity has movable part, after time one length, is difficult to reach desirable control effect.
The purpose of this utility model provides a kind of short-circuit protection to 220 volts of supply lines, the multi-functional runback protector of the overpressure protection of electricity consumption facility and power consumption voluntary ceiling.
For reaching above-mentioned purpose, the utility model utilizes high-power just warm quick resistance (PTC element), as current limiting element, with its serial connection in the line, does the short-circuit protection and the electric weight automatic control of main line.Utilize the picking up signal element of piezo-resistance, be serially connected in the control utmost point of bidirectional triode thyristor, and the negative electrode of bidirectional triode thyristor and anode are attempted by the later major loop two ends of thermistor as the superpressure input.
After adopting such elements combination, because thermistor has the performance of " heat is autotomyed, cold from logical ", it is serially connected in the major loop, when the electric current that flows through this resistance during greater than setting, heat is disconnected rapidly, with power consumption equipment and the isolated from power that is connected on after this.When superpressure was imported, piezo-resistance triggered bidirectional triode thyristor and relay conducting by by entering conducting, with the major loop short circuit, forced thermistor disconnected because of overcurrent heat, thereby cut off main power source.Effectively protected not reason superpressure and damaging of electricity consumption facility.
Below in conjunction with the drawings and specific embodiments, to this practical being described in further detail.
Fig. 1 is the control circuit that the utility model is made up of bidirectional triode thyristor when making overpressure protection.
Fig. 2 is the control circuit that the utility model is made up of relay when making overpressure protection.
The utility model shown in Figure 1 is assembled into whole circuit board by box body 5 and electronic component and forms.To have the thermistor 1 of " heat disconnected, cold logical " characteristic to be serially connected in the major loop, great power bidirectional controllable silicon 3 is attempted by the later major loop two ends of thermistor 1.When the electric current that feeds thermistor 1 during greater than rated value (line short circuit, electricity consumption excess load), thermistor 1 enters the electric heating process, and logical to transfer heat to disconnected by cold, main circuit cut off the output of protector no-voltage.Piezo-resistance 2 is connected on the control utmost point of bidirectional triode thyristor 3 as the pickup device of superpressure signal, when supply line exceeds permission voltage, terminal voltage forces piezo-resistance 2 to puncture conducting, trigger bidirectional triode thyristor 3 conductings simultaneously,, cause thermistor 1 to feed big electric current and hot breaking line short circuit.Protector no-voltage output this moment.
Light-emitting diode 6,7 and the warning circuit 8 common acousto-optic hint circuit of forming power supply, faulty indication.
When making thermistor 1 heat, any situation has no progeny, as long as feed the electric current of this resistance when being lower than this protector set value of the power (fault is got rid of the back), thermistor 1 is by the hot cold conditions that transfers to gradually, promptly by heat disconnected transfer to cold logical, enter from resetting process, continue electric.
The hot break time of thermistor 1, span are controlled by the size of power load, promptly feed the size of electric current.
Fig. 2 has provided another kind of high-power protective circuit.With small-sized AC relay 4 of serial connection in bidirectional triode thyristor 3 loops, its contact 4 is attempted by line output.After the superpressure input, bidirectional triode thyristor 3 triggering and conducting, relay 4 gets electric adhesive, and its contact 4 forces thermistor 1 heat disconnected, the output of major loop no-voltage the output short circuit.Reseting procedure among this figure, the operating principle of short-circuit protection is described identical with Fig. 1.
Certainly, the utility model also has the structure of alternate manner.As many thermistor serial or parallel connections, therefrom extract the terminals of power-adjustable out, to adapt to the selection of different user power, these all should be implemented within protection range of the present utility model.
Claims (5)
1, a kind of multi-functional runback protector that is applied in 220 volts of supply lines, it comprises box body, thermistor, bidirectional triode thyristor, piezo-resistance, miniature relay; It is characterized in that: the front end (power supply register one's residence place) that is directly installed on the electricity consumption facility.
2, multi-functional runback protector according to claim 1, it is characterized in that: thermistor (1) is serially connected in the major loop.
3, multi-functional runback protector according to claim 2 is characterized in that: described thermistor is high-power just warm quick resistance.
4, multi-functional runback protector according to claim 1, it is characterized in that: piezo-resistance (2) is connected on the control utmost point of bidirectional triode thyristor (3), and negative electrode, the anode of bidirectional triode thyristor (3) are attempted by line output.
5, multi-functional runback protector according to claim 1; it is characterized in that: in the high-power protective circuit; piezo-resistance (2) is connected to the control utmost point of bidirectional triode thyristor (3), is attempted by line output jointly with relay contact 4 after bidirectional triode thyristor (3) is connected with small-sized AC relay (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99234081 CN2393241Y (en) | 1999-09-17 | 1999-09-17 | Multifunction self-resetting safety fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99234081 CN2393241Y (en) | 1999-09-17 | 1999-09-17 | Multifunction self-resetting safety fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2393241Y true CN2393241Y (en) | 2000-08-23 |
Family
ID=34022331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99234081 Expired - Fee Related CN2393241Y (en) | 1999-09-17 | 1999-09-17 | Multifunction self-resetting safety fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2393241Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394495A (en) * | 2011-10-09 | 2012-03-28 | 杭州乾龙电器有限公司 | Dynamic thermal protection type overvoltage protector |
-
1999
- 1999-09-17 CN CN 99234081 patent/CN2393241Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394495A (en) * | 2011-10-09 | 2012-03-28 | 杭州乾龙电器有限公司 | Dynamic thermal protection type overvoltage protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |