CN2429946Y - Overheated protector for electric appliances - Google Patents
Overheated protector for electric appliances Download PDFInfo
- Publication number
- CN2429946Y CN2429946Y CN 00212263 CN00212263U CN2429946Y CN 2429946 Y CN2429946 Y CN 2429946Y CN 00212263 CN00212263 CN 00212263 CN 00212263 U CN00212263 U CN 00212263U CN 2429946 Y CN2429946 Y CN 2429946Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- voltage
- electrical equipment
- executive
- 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
Abstract
The utility model relates to an electronic device which is used for the over-temperature protection of electric appliances, composed of a power circuit, a comparison and amplification circuit, and an executive circuit. An original transformer is replaced by a voltage decreasing capacitor in the power circuit and a rectification and voltage stabilizing circuit, and a voltage-sensitive resistor for absorbing voltage which is produced at an on-off moment is connected in parallel with both terminals of a power supply. A thermoswitch resistor which is inlaid at the heating position of an electric appliance is used as a voltage dividing resistor of a voltage dividing network at the input terminal of a comparator; a contact of the executive circuit, which is connected in series in a control loop, is controlled by a relay of the executive circuit, so that the purpose of temperature protection can be realized.
Description
The utility model relates to be arranged at and in unusual temperature range, be prone on unusual or the electrical appliance that damages, make it obtain a kind of electronic protection of temperature protection.
Electrical appliance in the course of the work, its a certain parts as coil etc., usually can burn the work that destroys whole electrical equipment because of the high temperature that unusual condition such as overcurrent, overload or long-term operation work produce, even make 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, its main cause is: the first, the power supply transformation product itself in the protector are exactly a main heater members, long-term work can make the insulating barrier between the lead wear out gradually, break, so that short circuit, burn; The second, for some large power-consuming equipments, can produce very high pulse voltage or wave swimming voltage in power on/off moment, if this voltage is not suppressed, then be easy to the breakdown protection device, and lose protective effect; When three, the relay contact break-make in the executive circuit was worked, the electric arc of its generation had shortened the useful life of relay, and especially the alternating electric field of its generation can destroy other parts of protector equally.Because there is many-sided defective in this electronic protector, shows that this protector is difficult to shoulder the most basic design function that power circuit is provided protection.Therefore, this overtemperature prote device is not satisfactory.
Goal of the invention of the present utility model is to provide the electrical equipment overtemperature protection device of a kind of dependable performance, perfect in shape and function, strong interference immunity.
This electrical equipment overtemperature protection device, be to constitute by power circuit, comparison amplifying circuit and executive circuit, the major technique of the technical program is characterised in that power circuit is with decompression capacitor and rectification and voltage stabilizing circuit composition, a piezo-resistance in parallel between positive source and the ground is used to absorb the pulse voltage that electrical equipment break-make power supply moment is produced; To be embedded in that electrical equipment is easy to produce high temperature and the thermoswitch resistance of a scaling loss parts divider resistance of amplifier transducing signal input pickup resistance potential-divider network as a comparison; Relay as the executive circuit critical component inserts the relatively switching signal output of amplifying circuit, and control is serially connected with relay contact adhesive of electrical work control loop loop or release, to reach the purpose of protection electrical equipment.
In technique scheme,, on thermoswitch resistance, be connected with the anti-pressure protection circuit that two diodes are formed for avoiding scurrying into the destruction of reverse utilization voltage to itself element by thermoswitch resistance pin.
In the technique scheme, for preventing the destruction of wave swimming voltage or pulse voltage, being in parallel with thermoswitch resistance is provided with a piezo-resistance.
The electrical equipment temperature control protective device that the utility model provides has replaced original power transformer with decompression capacitor and voltage stabilizing chip, has eliminated the disadvantage of protector heating itself; A power end piezo-resistance in parallel in addition, the pulse voltage that produces when being used to absorb break-make electrical equipment, protective device itself.This electrical equipment temperature control protection not only has the defencive function of former abnormal temperature work; and can bear other interference or destroy the signal of telecommunication and do not influence itself work and use; can safeguard the normal performance of its defencive function; have high reliability and interference free performance; circuit is formed simple in structure, easy to implement.
Describe technology contents of the present utility model in detail below in conjunction with enforcement structure shown in the drawings.
Fig. 1 is the circuit composition frame chart of the utility model protective device
Fig. 2 reaches the scheme of installation that is used for motor protection for example for the circuit theory diagrams of the utility model protective device.
Be that this protective device is applied to the concrete electrical connection diagram that motor protection is an example, thermoswitch resistance R as shown in the figure
T1Be one of divider resistance of hot sensing potential-divider network, be connected the input of universal amplifier 1, its specifically be provided with the position can imbed in the motor windings or electrical appliance in be easy to the parts place that produces high temperature, burn easily, the relay contact of executive circuit is the normally-closed contact K switch that is arranged in control circuit 4 major loops
J
Its course of work is: during normal temperature, and thermistor R
T1Resistance is very little, and control circuit 4 is connected, and keeps the operate as normal of electrical equipment; When part temperatures rising on every side makes thermistor R
T1Resistance sharply increases, and when reaching the temperature switch turnover voltage that its comparison amplifier 1 sets, the relay J of executive circuit 3 makes it be serially connected with relay contact K in the control loop 4
JDischarge, cut off the power supply of electrical appliance, realize the purpose of overtemperature prote electrical equipment.
The power circuit 2 of this protective device is made up of capacitor C and rectification and voltage stabilizing chip 6, and AC supply voltage is the step-down power supply on capacitor C.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; Simultaneously for preventing the destruction of wave swimming voltage and pulse voltage, thermoswitch resistance R
T1On a piezo-resistance R also can and be arranged
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 relay contact K
JThe reliability of action prolongs the useful life of relay J, eliminates the destruction of electric arc to the contact, at relay contact K
JLocate a thermistor R in parallel
12
In above-mentioned protective device, also be provided with the three-phase open-phase protection circuit, drive relay work by sample circuit RN, comparison amplifying circuit 1, make this 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, a kind of electrical equipment overtemperature protection device; it comprises power circuit (2), compares amplifying circuit (1) and executive circuit (3) formation; it is characterized in that power circuit (2) is to form with decompression capacitor and rectification and voltage stabilizing circuit, a piezo-resistance (R in parallel between the positive plate of power supply and the ground
V1); To be embedded in the thermoswitch resistance (R that is easy to produce high temperature, scaling loss parts place in the electrical equipment
T1) divider resistance of amplifier transducing signal input pickup resistance potential-divider network as a comparison; Relay (J) as executive circuit (3) critical component inserts the relatively switching signal output of amplifying circuit (1), and control is serially connected with electrical work control loop loop (4) relay contact (K
J) adhesive or release.
2, protective device according to claim 1 is characterized in that thermistor (R
T1) on be connected to the reverse protection circuit that two diodes (D1, D2) constitute.
3, protective device according to claim 1 is characterized in that thermistor (R
T1) a two ends piezo-resistance (R in parallel
V2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00212263 CN2429946Y (en) | 2000-06-13 | 2000-06-13 | Overheated protector for electric appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00212263 CN2429946Y (en) | 2000-06-13 | 2000-06-13 | Overheated protector for electric appliances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2429946Y true CN2429946Y (en) | 2001-05-09 |
Family
ID=33578808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00212263 Expired - Fee Related CN2429946Y (en) | 2000-06-13 | 2000-06-13 | Overheated protector for electric appliances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2429946Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425383C (en) * | 2005-10-25 | 2008-10-15 | 上海东升焊接集团有限公司 | Overheat protection circuit for fan of electric welder |
-
2000
- 2000-06-13 CN CN 00212263 patent/CN2429946Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425383C (en) * | 2005-10-25 | 2008-10-15 | 上海东升焊接集团有限公司 | Overheat protection circuit for fan of electric welder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105453432A (en) | Solid state relay protective device | |
| CN106783394A (en) | The contact protection circuit and the power supply control apparatus comprising the contact protection circuit of relay | |
| CN2429946Y (en) | Overheated protector for electric appliances | |
| CN203366023U (en) | AC control switch device and intelligent control system | |
| CN103094887A (en) | Overcurrent and over-temperature protection control circuit | |
| CN2435861Y (en) | Leakage protective plug with ultrahigh temp. protection | |
| CN201733073U (en) | Motor protector realizing protection by positive temperature factor thermistance | |
| CN201163720Y (en) | Multi-use household electrical appliance protector capable of automatic trip when power-on after power-off | |
| CN210806723U (en) | Overheat and overload protector for single-phase electric appliance | |
| CN2281600Y (en) | Overheating protector for electric appliance | |
| CN109599839A (en) | A kind of protection circuit and blender | |
| CN216698226U (en) | Temperature protector | |
| CN2082908U (en) | Secondary circuit disconnection protective device of current transformer | |
| CN2495023Y (en) | Ultramicro built-in overcurrent & overheat protector | |
| CN201222644Y (en) | Leakage current motion protector with temperature control | |
| CN2571047Y (en) | Multifunctional earth leakage protective device | |
| RU2241294C2 (en) | Load overvoltage protective gear | |
| CN2131233Y (en) | Remote-controlled integrated auto-breaking protector | |
| CN2273917Y (en) | Phase interruption protective device for ac electric motor | |
| CN2519404Y (en) | Overtemperature protective breaker | |
| CN204068203U (en) | Household electrical appliance frequency conversion drive loop charging circuit protective device | |
| CN2148421Y (en) | Full protector for motor | |
| KR100483932B1 (en) | Over Load Breaker having Sensitivity Adjustment Function | |
| CN2645223Y (en) | Male plug type creepage and circuit break protector | |
| CN2495025Y (en) | Power-off reset overload protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| FG1K | Grant of 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 |