CN2281600Y - Overheating protector for electric appliance - Google Patents
Overheating protector for electric appliance Download PDFInfo
- Publication number
- CN2281600Y CN2281600Y CN 94230355 CN94230355U CN2281600Y CN 2281600 Y CN2281600 Y CN 2281600Y CN 94230355 CN94230355 CN 94230355 CN 94230355 U CN94230355 U CN 94230355U CN 2281600 Y CN2281600 Y CN 2281600Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- electric appliance
- power supply
- voltage
- 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
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a temperature protective device which is suitable for an electric appliance. The temperature protective device is composed of a power supply circuit, a comparative and amplifying circuit, and an executive circuit, wherein, the power supply circuit adopts a depressurization capacitor and a rectification voltage regulation chip to replace an original transformer. A power supply end is connected in parallel with a pressure responsive resistor which is used for absorbing pulse voltage which is generated when an electric appliance is connected or disconnected with the power supply. A temperature switch resistor which is buried in the heating part of the electric appliance is used as the voltage division resistor of a voltage division circuit at the input end of a comparative and amplifying device to control a relay connected with the output end of the amplifying device and a contact point which is connected in series with a control circuit. The power supply source of the electric appliance is connected or disconnected through the control circuit, and the electric appliance can be protected.
Description
The utility model relates to be prone to a kind of protective device of using on the electrical appliances such as unusual or damage in unusual temperature range.
Electrical appliance in the course of the work, the high temperature that abnormal conditions such as its a certain position such as coil etc. usually can be because of overcurrents, overload or long-term operation work produce can destroy the work of whole electrical equipment, even makes whole electrical equipment subscription rate.For addressing this problem; it is the control foundation with the temperature that the technical staff has designed various; when reaching a certain temperature extremes; electrical equipment is quit work; a kind of " motor over-temperature protector " as Chinese patent CN92219503.X design; this protector by power transformer, rectifier diode, relatively reach amplifying circuit and executive circuit is formed, remove to cut off the electrical appliance power supply by the relay contact of executive circuit.In above-mentioned protector, because the imperfection of circuit, be very easy to cause the damage of protector itself and electrical equipment is lost protective capability, as the transformer itself in the 1. protector also is a heater members, and long-term work can make that the insulating barrier between the lead is aging gradually, short circuit and burn transformer; 2. can produce very high pulse voltage or wave swimming voltage for some main equipments in power on/off moment, if this voltage is not suppressed, breakdown protection device at an easy rate, and lose protective effect; When 3. the relay contact break-make in the executive circuit was worked, the electric arc of generation had reduced the useful life of relay, and especially the alternating electric field that this moment, electric arc produced can destroy protector equally.There is many-sided defective in this protector, shows that this protector is difficult to shoulder the basic design philosophy that electrical appliance is provided protection.Therefore, this overtemperature prote device is not very desirable.
Invention order of the present utility model has the electrical equipment overtemperature protection device that is to provide a kind of dependable performance, perfect, strong interference immunity.
This electrical equipment overtemperature protection device, be to constitute by power circuit, comparison amplifying circuit and executive circuit, be primarily characterized in that power circuit is with decompression capacitor and rectification and voltage stabilizing chip composition, a piezo-resistance in parallel between power end and the ground is used to absorb the pulse voltage that electrical equipment break-make power supply moment produces; To be embedded in that electrical equipment is easy to produce high temperature and the thermoswitch resistance at scaling loss position as the step-down power supply on capacitor C of stream supply voltage.Be parallel with the piezo-resistance R of an absorption pulse voltage at power end
V1
Be protective device itself, when by the thermoswitch resistance R
T1When scurrying into reverse utilization voltage, in the thermoswitch resistance R
T1Link be provided with the reverse protection circuit of forming by diode D1, D2; For preventing the destruction of wave swimming voltage and pulse voltage, also can be parallel with a piezo-resistance R on the thermoswitch resistance simultaneously
V2, when pulse voltage arrives, piezo-resistance R
V2Resistance raises, and has absorbed the harmful effect of this pulse voltage to electrical equipment.
For guaranteeing the reliability of relay contact action, prolong the useful life of relay, eliminate the destruction of electric arc, at relay contact K to the contact
JLocate a thermistor R in parallel
T2
In above-mentioned protective device, also be provided with the three-phase open-phase protection circuit, by sample circuit R
N, amplifying circuit 1 drives relay work, makes this protective device have more perfect defencive function.And can show respectively normal, overload, three kinds of situations of phase shortage by light-emitting diode D3, D4 in the display circuit 5, D5.
Claims (3)
1. electrical equipment overtemperature protection device, it is by power circuit (2), relatively amplifying circuit (1) and executive circuit (3) constitute, and it is characterized in that easily producing the also divider resistance of amplifier (1) input pickup resistance bleeder circuit as a comparison of the thermoswitch resistance (Rt1) in the fragile position of high temperature to be embedded in electrical equipment; Relay (J) inserts between the output of amplifying circuit (1) relatively and the ground and constitutes executive circuit (3), and control is serially connected in the relay contact (K that is used in the control circuit (4) of switching appliances power source
J) adhesive and release; Power circuit (2) is with decompression capacitor (C) and rectifying and voltage-stabilizing chip (6) and is attempted by a piezo-resistance (R of both ends of power
V1) the common composition.
2. protective device according to claim 1 is characterized in that for preventing by thermistor (R
T1) the reverse voltage damage preventor scurried into, be connected to diode reverse protective circuit (D1, D2) on it.
3. protective device according to claim 1 is characterized in that at thermoswitch resistance (R
T1) a two ends piezo-resistance (R in parallel
V2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94230355 CN2281600Y (en) | 1994-09-30 | 1994-09-30 | Overheating protector for electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94230355 CN2281600Y (en) | 1994-09-30 | 1994-09-30 | Overheating protector for electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2281600Y true CN2281600Y (en) | 1998-05-13 |
Family
ID=33842477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94230355 Expired - Fee Related CN2281600Y (en) | 1994-09-30 | 1994-09-30 | Overheating protector for electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2281600Y (en) |
-
1994
- 1994-09-30 CN CN 94230355 patent/CN2281600Y/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2301456A1 (en) | Circuit protection device | |
| CA2023605A1 (en) | Protection circuit protected from overvoltage and overcurrent | |
| CN2281600Y (en) | Overheating protector for electric appliance | |
| CN2429946Y (en) | Overheated protector for electric appliances | |
| CN201733073U (en) | Motor protector realizing protection by positive temperature factor thermistance | |
| CN2435861Y (en) | Leakage protective plug with ultrahigh temp. protection | |
| CN2187348Y (en) | Protective module for electric machines | |
| WO1995027302A1 (en) | Protective device against thermal overload for a small high-heat-load electric motor | |
| CN2335293Y (en) | Self-recovery indicating type protector | |
| CN2134731Y (en) | Protective means for solid-state relay | |
| CN2457706Y (en) | Safety pressure sensitive resistor | |
| CN102394495A (en) | Dynamic thermal protection type overvoltage protector | |
| CN202103409U (en) | Over-current protector for three-phase electronic motor | |
| CN2248412Y (en) | Multi-function automatic protecting voltage stabilizer for overload and short-circuit | |
| CN2571047Y (en) | Multifunctional earth leakage protective device | |
| KR101004987B1 (en) | Surge protector having overheat protection device | |
| CN2495023Y (en) | Ultramicro built-in overcurrent & overheat protector | |
| CN2159527Y (en) | Conditioner protector | |
| CN2148421Y (en) | Full protector for motor | |
| CN209016698U (en) | A kind of combination switch with self-protection function | |
| CN2229102Y (en) | Voltage-sensitive resistor | |
| RU2231190C2 (en) | Gear to protect user against nonrated voltage and current in a c networks with amplitude limiter | |
| KR200144033Y1 (en) | Overvoltage protection circuit using varistor | |
| CN111600287A (en) | Lightning protection voltage-resistant overcurrent protection circuit applied to products in power industry | |
| RU2241294C2 (en) | Load overvoltage protective gear |
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 |