CN104410049A - Automatic power source turning on-off circuit with overvoltage and overcurrent protection circuit - Google Patents
Automatic power source turning on-off circuit with overvoltage and overcurrent protection circuit Download PDFInfo
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- CN104410049A CN104410049A CN201410692877.1A CN201410692877A CN104410049A CN 104410049 A CN104410049 A CN 104410049A CN 201410692877 A CN201410692877 A CN 201410692877A CN 104410049 A CN104410049 A CN 104410049A
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Abstract
The invention discloses an automatic power source turning on-off circuit with an overvoltage and overcurrent protection circuit. The automatic power source turning on-off circuit is mainly composed of a transformer T1, a button S1 arranged on a non-same-name end of an original side of the transformer T1, a rectifier filter circuit connected with an auxiliary side of the transformer T1, a time delay circuit, a voltage stabilizing circuit connected with an output end of the time delay circuit, and a load detection circuit connected with an output end of the voltage stabilizing circuit. The automatic power source turning on-off circuit is characterized in that the overvoltage and overcurrent protection circuit is arranged between the rectifier filter circuit and the time delay circuit and composed of a protecting chip U2, a triode VT1, a triode VT2, a triode VT3, a capacitor C2 and a diode D1, an anode of the capacitor C2 is connected with a CONT pin of the protecting chip U2 while a cathode of the same is connected with the rectifier filter circuit, and an N pole of the diode D1 is connected with a VCC pin of the protecting chip U2 while a P pole of the same is connected with a TR1 pin of the protecting chip U2. The overvoltage and overcurrent circuit can automatically execute protection action when current or voltage on an electricity load is overloaded, so that the load and the power source turning on-off circuit are avoided being damaged.
Description
Technical field
The present invention relates to a kind of circuit, specifically refer to a kind of power automatic switch circuit with over-voltage over-current protection.
Background technology
Electric energy is the one energy easily, and its extensive use defines the second technical revolution in mankind's modern history.Effectively promote the development of human society, created great riches to the mankind, improve the life of the mankind.In production and life, people be unable to do without electricity at present.
Along with the continuous progress of society and the development of science and technology, people are more and more concerned about so low-carbon environment-friendly, becomes megatrend by the earth that we depend on for existence already.Meanwhile, along with the raising of people's living standard, the continuous increase of household electrical appliance, with in electric process, the person caused due to the carelessness of people gets an electric shock and fire incident, causes very large threat to the life of the people and property.So saves energy and safety utilization of electric power is people makes great efforts to carry out always, therefore power switch circuit has been applied in the middle of people live.But current power switch circuit does not have automatic protection functions, when the voltage of load or electric current too high time can cause damage to by electric loading.
Summary of the invention
The object of the invention is to overcome the defect that the power switch circuit used at present does not have automatic protection functions, a kind of power automatic switch circuit with over-voltage over-current protection is provided.
Object of the present invention is achieved through the following technical solutions: a kind of power automatic switch circuit with over-voltage over-current protection, primarily of transformer T1, be arranged on the button S1 on the non-same polarity of transformer T1 former limit, the current rectifying and wave filtering circuit be connected with transformer T1 secondary, delay circuit, the voltage stabilizing circuit be connected with delay circuit output, and the load detecting circuit to be connected with circuit output end of pressure-stabilizing forms, and is also provided with over-voltage over-current protection circuit between current rectifying and wave filtering circuit and delay circuit, described over-voltage over-current protection circuit is by protect IC U2, triode VT1, triode VT2, triode VT3, positive pole is connected with the CONT pin of protect IC U2, the electric capacity C2 that negative pole is connected with current rectifying and wave filtering circuit, N pole is connected with the VCC pin of protect IC U2, the diode D1 that P pole is connected with the TRI pin of protect IC U2, positive pole is connected with the TRI pin of protect IC U2, the electric capacity C3 that negative pole is connected with the negative pole of electric capacity C2, one end is connected with the OUT pin of protect IC U2, the resistance R1 that the other end is connected with the base stage of triode VT3, one end is connected with the N pole of diode D1, the resistance R2 that the other end is connected with the collector electrode of triode VT1, P pole is connected with the base stage of triode VT2, the diode D2 that N pole is connected with the emitter of triode VT1 after resistance R3, and one end is connected with the collector electrode of triode VT3, the resistance R4 that the other end is connected with the N pole of diode D2 forms, the RESET pin of described protect IC U2 is connected with its VCC pin, VCC pin is connected with the emitter of triode VT3, THRE pin is connected with the collector electrode of triode VT1, GND pin ground connection, DIS pin is connected with current rectifying and wave filtering circuit, the base stage of triode VT1 is connected with the positive pole of electric capacity C3, collector electrode is connected with the collector electrode of triode VT2, emitter is connected with the negative pole of electric capacity C3, the emitter of triode VT2 is connected with the N pole of delay circuit and diode D2 simultaneously, the collector electrode of triode VT3 is connected with delay circuit, the N pole of diode D2 is connected with delay circuit.
Further, described current rectifying and wave filtering circuit comprises diode bridge rectifier U1, and electric capacity C1; Two inputs of diode bridge rectifier U1 are connected with non-same polarity with the Same Name of Ends of transformer T1 secondary, and two output is then connected with positive and negative the two poles of the earth of electric capacity C1; Electric capacity C1 positive pole is also connected with the DIS pin of protect IC U2, negative pole is then connected with the negative pole of electric capacity C2.
Described delay circuit is by triode VT4, diode D3, the resistance R5 that one end is connected with the base stage of triode VT4, the other end is connected with voltage stabilizing circuit with the N pole of diode D3 after electric capacity C4 simultaneously, the resistance R6 that one end is connected with the emitter of triode VT4, the other end is connected with voltage stabilizing circuit, and form with the relay K that diode D3 is in parallel; The emitter of described triode VT4 is also connected with the N pole of diode D2, and its collector electrode is connected with the P pole of diode D3; The N pole of diode D3 is also connected with the collector electrode of triode VT3, and resistance R5 is connected with load detecting circuit with the tie point of electric capacity C4, and the normally opened contact K-1 of relay K is then in parallel with button S1.
Described voltage stabilizing circuit comprises three terminal regulator U3, resistance R8, electric capacity C5, potentiometer R7; One end of resistance R8 is connected with the N pole of diode D3 with the IN pin of three terminal regulator U3 simultaneously, the other end is connected with load detecting circuit with the OUT pin of three terminal regulator U3 after electric capacity C5 simultaneously, resistance R8 is connected with the GND pin of three terminal regulator U3 with the tie point of electric capacity C5, ground connection while one end of potentiometer R7 is connected with the GND pin of three terminal regulator U3, the other end is connected with resistance R6.
Described load detecting circuit comprises diode D4, diode D5, triode VT5, resistance R9; Diode D4 and diode D5 is in series, and the emitter of triode VT5 is connected with the P pole of diode D4 with the OUT pin of three terminal regulator U3 simultaneously, its collector electrode is connected with the tie point of electric capacity C4 with resistance R5, its base stage is connected with the N pole of diode D5 after resistance R9.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) over-voltage over-current protection circuit of the present invention can make protection act automatically when transshipping with the curtage in electric loading, avoids load and power switch circuit itself to be damaged.
(2) the present invention with can realize auto-breaking when useless electric loading, saves energy.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1; the power automatic switch circuit with over-voltage over-current protection of the present invention; primarily of transformer T1; be arranged on the button S1 on the non-same polarity of transformer T1 former limit; the current rectifying and wave filtering circuit be connected with transformer T1 secondary; delay circuit, the voltage stabilizing circuit be connected with delay circuit output, and the load detecting circuit be connected with circuit output end of pressure-stabilizing forms.In order to make power automatic switch circuit have automatic protection functions, between current rectifying and wave filtering circuit and delay circuit, be also provided with over-voltage over-current protection circuit.
Described over-voltage over-current protection circuit is by protect IC U2, triode VT1, triode VT2, triode VT3, positive pole is connected with the CONT pin of protect IC U2, the electric capacity C2 that negative pole is connected with current rectifying and wave filtering circuit, N pole is connected with the VCC pin of protect IC U2, the diode D1 that P pole is connected with the TRI pin of protect IC U2, positive pole is connected with the TRI pin of protect IC U2, the electric capacity C3 that negative pole is connected with the negative pole of electric capacity C2, one end is connected with the OUT pin of protect IC U2, the resistance R1 that the other end is connected with the base stage of triode VT3, one end is connected with the N pole of diode D1, the resistance R2 that the other end is connected with the collector electrode of triode VT1, P pole is connected with the base stage of triode VT2, the diode D2 that N pole is connected with the emitter of triode VT1 after resistance R3, and one end is connected with the collector electrode of triode VT3, the resistance R4 that the other end is connected with the N pole of diode D2 forms, the RESET pin of described protect IC U2 is connected with its VCC pin, VCC pin is connected with the emitter of triode VT3, THRE pin is connected with the collector electrode of triode VT1, GND pin ground connection, DIS pin is connected with current rectifying and wave filtering circuit, the base stage of triode VT1 is connected with the positive pole of electric capacity C3, collector electrode is connected with the collector electrode of triode VT2, emitter is connected with the negative pole of electric capacity C3, the emitter of triode VT2 is connected with the N pole of delay circuit and diode D2 simultaneously, the collector electrode of triode VT3 is connected with delay circuit, the N pole of diode D2 is connected with delay circuit.Over-voltage over-current protection circuit can in load curtage overload time automatically make protection act, avoid load and circuit itself to be damaged.In order to better implement the present invention, described protect IC U2 is preferably NE555 integrated chip.
In order to obtain smooth-going direct current, described current rectifying and wave filtering circuit comprises for civil power being become galvanic diode bridge rectifier U1, and electric capacity C1; Two inputs of diode bridge rectifier U1 are connected with non-same polarity with the Same Name of Ends of transformer T1 secondary, and two output is then connected with positive and negative the two poles of the earth of electric capacity C1; Electric capacity C1 positive pole is also connected with the DIS pin of protect IC U2, negative pole is then connected with the negative pole of electric capacity C2.
Described delay circuit is by triode VT4, diode D3, the resistance R5 that one end is connected with the base stage of triode VT4, the other end is connected with voltage stabilizing circuit with the N pole of diode D3 after electric capacity C4 simultaneously, the resistance R6 that one end is connected with the emitter of triode VT4, the other end is connected with voltage stabilizing circuit, and form with the relay K that diode D3 is in parallel; The emitter of described triode VT4 is also connected with the N pole of diode D2, and its collector electrode is connected with the P pole of diode D3; The N pole of diode D3 is also connected with the collector electrode of triode VT3, and resistance R5 is connected with load detecting circuit with the tie point of electric capacity C4, and the normally opened contact K-1 of relay K is then in parallel with button S1.
Described voltage stabilizing circuit comprises three terminal regulator U3, resistance R8, electric capacity C5, potentiometer R7; One end of resistance R8 is connected with the N pole of diode D3 with the IN pin of three terminal regulator U3 simultaneously, the other end is connected with load detecting circuit with the OUT pin of three terminal regulator U3 after electric capacity C5 simultaneously, resistance R8 is connected with the GND pin of three terminal regulator U3 with the tie point of electric capacity C5, ground connection while one end of potentiometer R7 is connected with the GND pin of three terminal regulator U3, the other end is connected with resistance R6.
Described load detecting circuit comprises diode D4, diode D5, triode VT5, resistance R9; Diode D4 and diode D5 is in series, and the emitter of triode VT5 is connected with the P pole of diode D4 with the OUT pin of three terminal regulator U3 simultaneously, its collector electrode is connected with the tie point of electric capacity C4 with resistance R5, its base stage is connected with the N pole of diode D5 after resistance R9.
When load occurring overcurrent, triode VT1 conducting, the THRE pin of protect IC and TRI pin are low level, and OUT pin puts sky makes triode VT3 end, down circuitry.Same, when voltage overload in load, diode D2 is breakdown, triode VT2 conducting, and protect IC U2 is in SM set mode, makes triode VT3 end equally, system cut-off.
As mentioned above, just well the present invention can be implemented.
Claims (5)
1. one kind has the power automatic switch circuit of over-voltage over-current protection, primarily of transformer T1, be arranged on the button S1 on the non-same polarity of transformer T1 former limit, the current rectifying and wave filtering circuit be connected with transformer T1 secondary, delay circuit, the voltage stabilizing circuit be connected with delay circuit output, and the load detecting circuit be connected with circuit output end of pressure-stabilizing forms, and it is characterized in that: between current rectifying and wave filtering circuit and delay circuit, be also provided with over-voltage over-current protection circuit, described over-voltage over-current protection circuit is by protect IC U2, triode VT1, triode VT2, triode VT3, positive pole is connected with the CONT pin of protect IC U2, the electric capacity C2 that negative pole is connected with current rectifying and wave filtering circuit, N pole is connected with the VCC pin of protect IC U2, the diode D1 that P pole is connected with the TRI pin of protect IC U2, positive pole is connected with the TRI pin of protect IC U2, the electric capacity C3 that negative pole is connected with the negative pole of electric capacity C2, one end is connected with the OUT pin of protect IC U2, the resistance R1 that the other end is connected with the base stage of triode VT3, one end is connected with the N pole of diode D1, the resistance R2 that the other end is connected with the collector electrode of triode VT1, P pole is connected with the base stage of triode VT2, the diode D2 that N pole is connected with the emitter of triode VT1 after resistance R3, and one end is connected with the collector electrode of triode VT3, the resistance R4 that the other end is connected with the N pole of diode D2 forms, the RESET pin of described protect IC U2 is connected with its VCC pin, VCC pin is connected with the emitter of triode VT3, THRE pin is connected with the collector electrode of triode VT1, GND pin ground connection, DIS pin is connected with current rectifying and wave filtering circuit, the base stage of triode VT1 is connected with the positive pole of electric capacity C3, collector electrode is connected with the collector electrode of triode VT2, emitter is connected with the negative pole of electric capacity C3, the emitter of triode VT2 is connected with the N pole of delay circuit and diode D2 simultaneously, the collector electrode of triode VT3 is connected with delay circuit, the N pole of diode D2 is connected with delay circuit.
2. a kind of power automatic switch circuit with over-voltage over-current protection according to claim 1, is characterized in that: described current rectifying and wave filtering circuit comprises diode bridge rectifier U1, and electric capacity C1; Two inputs of diode bridge rectifier U1 are connected with non-same polarity with the Same Name of Ends of transformer T1 secondary, and two output is then connected with positive and negative the two poles of the earth of electric capacity C1; Electric capacity C1 positive pole is also connected with the DIS pin of protect IC U2, negative pole is then connected with the negative pole of electric capacity C2.
3. a kind of power automatic switch circuit with over-voltage over-current protection according to claim 2, it is characterized in that: described delay circuit is by triode VT4, diode D3, the resistance R5 that one end is connected with the base stage of triode VT4, the other end is connected with voltage stabilizing circuit with the N pole of diode D3 after electric capacity C4 simultaneously, the resistance R6 that one end is connected with the emitter of triode VT4, the other end is connected with voltage stabilizing circuit, and form with the relay K that diode D3 is in parallel; The emitter of described triode VT4 is also connected with the N pole of diode D2, and its collector electrode is connected with the P pole of diode D3; The N pole of diode D3 is also connected with the collector electrode of triode VT3, and resistance R5 is connected with load detecting circuit with the tie point of electric capacity C4, and the normally opened contact K-1 of relay K is then in parallel with button S1.
4. a kind of power automatic switch circuit with over-voltage over-current protection according to claim 3, is characterized in that: described voltage stabilizing circuit comprises three terminal regulator U3, resistance R8, electric capacity C5, potentiometer R7; One end of resistance R8 is connected with the N pole of diode D3 with the IN pin of three terminal regulator U3 simultaneously, the other end is connected with load detecting circuit with the OUT pin of three terminal regulator U3 after electric capacity C5 simultaneously, resistance R8 is connected with the GND pin of three terminal regulator U3 with the tie point of electric capacity C5, ground connection while one end of potentiometer R7 is connected with the GND pin of three terminal regulator U3, the other end is connected with resistance R6.
5. a kind of power automatic switch circuit with over-voltage over-current protection according to claim 4, is characterized in that: described load detecting circuit comprises diode D4, diode D5, triode VT5, resistance R9; Diode D4 and diode D5 is in series, and the emitter of triode VT5 is connected with the P pole of diode D4 with the OUT pin of three terminal regulator U3 simultaneously, its collector electrode is connected with the tie point of electric capacity C4 with resistance R5, its base stage is connected with the N pole of diode D5 after resistance R9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692877.1A CN104410049A (en) | 2014-11-26 | 2014-11-26 | Automatic power source turning on-off circuit with overvoltage and overcurrent protection circuit |
| CN201510307232.6A CN104883079A (en) | 2014-11-26 | 2015-06-07 | Wide-pulse trigger type power supply automatic switching system with overvoltage and overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692877.1A CN104410049A (en) | 2014-11-26 | 2014-11-26 | Automatic power source turning on-off circuit with overvoltage and overcurrent protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104410049A true CN104410049A (en) | 2015-03-11 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410692877.1A Pending CN104410049A (en) | 2014-11-26 | 2014-11-26 | Automatic power source turning on-off circuit with overvoltage and overcurrent protection circuit |
| CN201510307232.6A Pending CN104883079A (en) | 2014-11-26 | 2015-06-07 | Wide-pulse trigger type power supply automatic switching system with overvoltage and overcurrent protection |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510307232.6A Pending CN104883079A (en) | 2014-11-26 | 2015-06-07 | Wide-pulse trigger type power supply automatic switching system with overvoltage and overcurrent protection |
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| CN (2) | CN104410049A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105892549A (en) * | 2016-03-31 | 2016-08-24 | 成都惠宝节能科技有限公司 | Third-order filtering type insulation board trimming system based on bipolar regulated power supply |
| CN108075543A (en) * | 2017-12-22 | 2018-05-25 | 东莞市辉豪电器制品有限公司 | A kind of protection circuit of emergency power supply |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505538B (en) * | 2015-09-08 | 2020-02-14 | 徐州立方机电设备制造有限公司 | Overcurrent protection circuit |
| CN105277756A (en) * | 2015-11-21 | 2016-01-27 | 成都科瑞信科技有限责任公司 | Testing rotating speed automatic adjustment type motor test system on the basis of voltage detection |
| CN107069672B (en) * | 2017-04-06 | 2019-03-15 | 六安市同心畅能电子科技有限公司 | A kind of battery overload short circuit automatic power-off protection circuit |
-
2014
- 2014-11-26 CN CN201410692877.1A patent/CN104410049A/en active Pending
-
2015
- 2015-06-07 CN CN201510307232.6A patent/CN104883079A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105892549A (en) * | 2016-03-31 | 2016-08-24 | 成都惠宝节能科技有限公司 | Third-order filtering type insulation board trimming system based on bipolar regulated power supply |
| CN108075543A (en) * | 2017-12-22 | 2018-05-25 | 东莞市辉豪电器制品有限公司 | A kind of protection circuit of emergency power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104883079A (en) | 2015-09-02 |
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Application publication date: 20150311 |