CN103515928A - Indirect type thermal overload protection device - Google Patents
Indirect type thermal overload protection device Download PDFInfo
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- CN103515928A CN103515928A CN201310496110.7A CN201310496110A CN103515928A CN 103515928 A CN103515928 A CN 103515928A CN 201310496110 A CN201310496110 A CN 201310496110A CN 103515928 A CN103515928 A CN 103515928A
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Abstract
The invention relates to an overload protection device, in particular to an indirect type thermal overload protection device. The thermal overload protection device comprises a rectification part, a power supply part, a current detection part, a signal amplification part, a time delay part and a silicon controlled drop-out part. The indirect type thermal overload protection device adopts a current transformer to detect the protected loop current and is isolated from the protected circuit electrically. The current transformer is used to detect the circuit current, and converts the current signal into a voltage signal; the signal is amplified through an operational amplifier; then, through time delay, a trigger gear is used to break the protected circuit; the time delay part is mainly for improving the stability of the device, and reducing moment interference of the protected circuit switch; the device can be debugged through adjusting resistance of an adjusting resistor. The indirect type thermal overload protection device can realize indirect type thermal overload protection, reduce interference to the protection device from external factors, and is short in debugging time and simple in production technology.
Description
Technical field
The present invention relates to a kind of overload protection arrangement, be specially indirect type heat overload protector.
Background technology
In the market heat overload protector be mainly by bimetal leaf string in protected loop, when load occurs when abnormal, the electric current that flows through bimetal leaf becomes large, bimetal leaf is crooked, triggers trip gear and makes switch trip.There is very large drawback in this mode, the consistency of product is poor, and overload current is difficult to accurate setting; In production and the course of processing, debug time is long, causes the manufacturing cycle long, and cost is high.And bimetal leaf is directly connected in protected loop, the variation in the oxidation of bimetal leaf, ambient temperature and space around etc. all can exert an influence to operating current, has further affected accuracy.
Summary of the invention
For above-mentioned problem, the invention provides the heat overload protector that a kind of accuracy is high, the production cycle is fast, concrete technical scheme is:
Indirect type heat overload protector, comprises that rectifying part, power unit, current detecting part, signal amplifying part are divided, time delay part and controllable silicon dropout part, wherein:
Rectifying part, becomes high voltage direct current by 220V AC rectification;
Power unit, through step-down and filtering, obtains level and smooth DC level VCC by high voltage direct current, for the transport and placing device dividing to signal amplifying part, provides operating voltage and time delay that reference voltage source is partly provided;
Current detecting part, detects output voltage signal for the electric current to protected loop;
Signal amplifying part is divided, and the voltage signal that current detecting is partly exported amplifies;
Time delay part, extends after a period of time the voltage signal after amplifying, signal after output time delay;
Reverse-blocking tetrode thyristor part, realizes and cuts off protected circuit power supply according to signal after time delay;
Described current detecting part comprises that current transformer, adjusting resistance and filter capacitor, the electric current that current transformer induces protected loop utilize adjusting resistance to carry out voltage adjustment successively, and the voltage after adjustment is capacitor filtering after filtering again; The resistance of adjusting resistance is adjustable.
Described time delay partly comprises reference voltage circuit, transport and placing device and delay circuit, and signal amplifying part divides current signal after the amplification of input after delay circuit, the positive pole of access transport and placing device; Reference voltage circuit is the negative pole input reference voltage through the backward transport and placing device of dividing potential drop by the voltage of DC level VCC.
Indirect type heat overload protector provided by the invention, makes Current Transformer detect protected loop current, and the electric upper isolation of protected circuit.By current transformer, carry out testing circuit electric current, after converting current signal to voltage signal, pass through amplifier amplifying signal, after time delay, trigger equipment disconnects protected circuit again, and time delay part is mainly for improving the stability of device, reduces the instantaneous interference of protected circuit switch; By regulating the resistance value of adjusting resistance, just can debug.
Indirect type heat overload protector provided by the invention, realizes the thermal overload protection function of indirect type, can reduce the interference of extraneous factor to protective device, and debug time is short, and production technology is simple.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, indirect type heat overload protector, comprises that rectifying part 100, power unit 200, current detecting part 300, signal amplifying part divide 400, time delay part 500 and controllable silicon dropout part 600, wherein:
Rectifying part 100, forms the voltage of 220V ac power input end L and N end after bridge rectifier through D1, D2, D3, D4, obtains a high voltage direct current;
Current detecting part 300; comprise successively Current Transmit, adjusting resistance R1 and filter capacitor C1; the electric current that Current Transmit induces protected loop utilizes adjusting resistance R1 to carry out voltage adjustment; voltage after adjustment is capacitor C 1 filtering after filtering again, and after resistance R 2, R3 current limliting, output voltage signal divides 400 to signal amplifying part.The resistance of adjusting resistance R1 is adjustable, the operating current value that the resistance that regulates R1 just can adjusting device.
Signal amplifying part divides 400, by transport and placing device U1A, the voltage signal of current detecting part 300 outputs is amplified, and by transport and placing device U1A negative pole access resistance R 6, R7, regulates magnification ratio.
Time delay part 500, comprises reference voltage circuit, transport and placing device and delay circuit, and signal amplifying part is divided after the delay circuit that the voltage signal after the amplification of input forms through R8, C4, the positive pole of access transport and placing device U1B; Reference voltage circuit obtains the voltage of DC level VCC the negative pole that a reference voltage is received transport and placing device U1B after R10, R11 dividing potential drop on R11, as input reference voltage.
Reverse-blocking tetrode thyristor part 600, realizes and cuts off protected circuit power supply; The transport and placing device U1B output of time delay part 500 is connected to controllable silicon SCR through current-limiting resistance R9 and controls the utmost point; when transport and placing device U1B output high level, make controllable silicon SCR conducting, electromagnet DCT obtains electric adhesive; the moving striker percussion trip gear that drives unshakable in one's determination makes switch trip, cuts off protected circuit.
Claims (3)
1. indirect type heat overload protector, is characterized in that: comprise that rectifying part, power unit, current detecting part, signal amplifying part are divided, time delay part and controllable silicon dropout part, wherein:
Rectifying part, becomes high voltage direct current by 220V AC rectification;
Power unit, through step-down and filtering, obtains level and smooth DC level VCC by high voltage direct current, for the transport and placing device dividing to signal amplifying part, provides operating voltage and time delay that reference voltage source is partly provided;
Current detecting part, detects output voltage signal for the electric current to protected loop;
Signal amplifying part is divided, and the voltage signal that current detecting is partly exported amplifies;
Time delay part, extends after a period of time the voltage signal after amplifying, signal after output time delay;
Reverse-blocking tetrode thyristor part, realizes and cuts off protected circuit power supply according to signal after time delay.
2. indirect type heat overload protector according to claim 1, it is characterized in that: described current detecting part comprises current transformer, adjusting resistance and filter capacitor successively, the electric current that current transformer induces protected loop utilizes adjusting resistance to carry out voltage adjustment, and the voltage after adjustment is capacitor filtering after filtering again; The resistance of adjusting resistance is adjustable.
3. indirect type heat overload protector according to claim 1 and 2, it is characterized in that: described time delay partly comprises reference voltage circuit, transport and placing device and delay circuit, signal amplifying part divides current signal after the amplification of input after delay circuit, the positive pole of access transport and placing device; Reference voltage circuit is the negative pole input reference voltage through the backward transport and placing device of dividing potential drop by the voltage of DC level VCC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310496110.7A CN103515928A (en) | 2013-10-22 | 2013-10-22 | Indirect type thermal overload protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310496110.7A CN103515928A (en) | 2013-10-22 | 2013-10-22 | Indirect type thermal overload protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103515928A true CN103515928A (en) | 2014-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310496110.7A Pending CN103515928A (en) | 2013-10-22 | 2013-10-22 | Indirect type thermal overload protection device |
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| CN (1) | CN103515928A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160990Y (en) * | 1992-12-17 | 1994-04-06 | 张世兴 | Multifunctional electricity-saving contactor |
| CN2222408Y (en) * | 1994-08-18 | 1996-03-13 | 四川省达川地区电子技术研究所 | Domestic electric power protector |
| CN1691453A (en) * | 2004-04-23 | 2005-11-02 | 爱普罗国际电气（中山）有限公司 | Safety power utilization protector |
| CN101814714A (en) * | 2009-02-21 | 2010-08-25 | 湖北盛佳电器设备有限公司 | Load control circuit breaker with circuit abnormal detection function |
| CN203504146U (en) * | 2013-10-22 | 2014-03-26 | 无锡华阳科技有限公司 | Indirect type thermal overload protection device |
-
2013
- 2013-10-22 CN CN201310496110.7A patent/CN103515928A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2160990Y (en) * | 1992-12-17 | 1994-04-06 | 张世兴 | Multifunctional electricity-saving contactor |
| CN2222408Y (en) * | 1994-08-18 | 1996-03-13 | 四川省达川地区电子技术研究所 | Domestic electric power protector |
| CN1691453A (en) * | 2004-04-23 | 2005-11-02 | 爱普罗国际电气（中山）有限公司 | Safety power utilization protector |
| CN101814714A (en) * | 2009-02-21 | 2010-08-25 | 湖北盛佳电器设备有限公司 | Load control circuit breaker with circuit abnormal detection function |
| CN203504146U (en) * | 2013-10-22 | 2014-03-26 | 无锡华阳科技有限公司 | Indirect type thermal overload protection device |
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Application publication date: 20140115 |