CN102227083A - Self-recovery overvoltage protection module for AC electric appliance - Google Patents
Self-recovery overvoltage protection module for AC electric appliance Download PDFInfo
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- CN102227083A CN102227083A CN2011101740989A CN201110174098A CN102227083A CN 102227083 A CN102227083 A CN 102227083A CN 2011101740989 A CN2011101740989 A CN 2011101740989A CN 201110174098 A CN201110174098 A CN 201110174098A CN 102227083 A CN102227083 A CN 102227083A
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- overcurrent
- overvoltage protection
- overvoltage
- blockout
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Abstract
The invention discloses a self-recovery overvoltage protection module for AC electric appliance. The overvoltage protection module comprises a pressure-sensitive resistor ZR1, one end of the pressure-sensitive resistor ZR1 is in series connection with a capacitor C1, and the pressure-sensitive resistor ZR1 connects a control pole of a bidirectional thyristor SCR1. T1electrode of the bidirectional thyristor SCR1 connects one end of an overcurrent blockout circuit PR2. The other end of the overcurrent blockout circuit PR2 is in parallel connection with one end of an overcurrent blockout circuit PR1 and the other end of the pressure-sensitive resistor ZR1, and the overcurrent blockout circuit PR2 connects an output end of an overvoltage protection circuit. The other end of the overcurrent blockout circuit PR1 connects an input end of the overvoltage protection circuit. T2 electrode of the bidirectional thyristor SCR1 is in parallel connection with the other input end of the overvoltage protection circuit and the other output end of the overvoltage protection circuit. The overvoltage protection module in the invention is based on blockout characteristic of a PR overcurrent blockout device. The overvoltage protection module is a restorable blockout overvoltage self protection device with simple preparation and low cost.
Description
Technical field
The invention belongs to the mining technical field of electricity, particularly a kind of ac electric apparatus self recovery overvoltage protective module.
Background technology
At present, two kinds of electric pressure power supplies of mining down-hole 1140/660VAC generally commonly used, electric equipment is often changed the place to use, and the variation of power supply grade takes place often.As by the use equipment replacement under the 660VAC condition of power supply when the 1140VAC condition of power supply uses down, the inconsistent electric equipment that causes that inside electric appliance control loop power supply grade takes place in regular meeting burns out.Superhigh pressure of the present invention is meant＞130% special superpressure.The protection range of general ac electric apparatus overvoltage protector is mostly 110%～125% (adjustable); this overvoltage protection has only been implemented protection to follow-up controlled device; and overvoltage protector self still is in overvoltage condition; very easily burn out protector self, especially easy burn-out self more when this serious overvoltage (＞130%) takes place.Realize just must reducing or cut off the input power supply to the special overpressure protection of self, must cause protector self cisco unity malfunction in case reduce or cut off the input power supply, this present invention just solves one of ground difficult point.The current solution that retrieves is to use " fuse " or " piezo-resistance " to implement protection, but this protection all is disposable irrecoverable type protection, in case take place equipment can't be moved, causes stopping production and needs to change related device.Yet there are no the overcurrent device in the prior art in ultra-voltage self-insurance field, the report that realization can recovery type blocking type ultra-voltage self-insurance device.
Summary of the invention
The purpose of this invention is to provide a kind of ac electric apparatus self recovery overvoltage protective module; solving the problem that the disposable irrecoverable type protection of mine electric equipment of the prior art when changing power supply can cause equipment to move, and voltage when surpassing serious superpressure more than 130% electric equipment and the protection problem of overvoltage protective module self.
Technical scheme of the present invention is; a kind of mining self recovery overvoltage protective module; this overvoltage protective module comprises: a piezo-resistance ZR1; the end of this piezo-resistance ZR1 is connected in series the control utmost point that meets bidirectional thyristor SCR1 after the capacitor C 1; the T1 electrode of bidirectional thyristor SCR1 is taken over the end of current blocking circuit PR2; the end of the other end of overcurrent blocking circuit PR2 and overcurrent blocking circuit PR1 and the other end of piezo-resistance ZR1 and connect after be connected an end of overvoltage crowbar output again; the other end of overcurrent blocking circuit PR1 is taken over an end of voltage protection circuit input, and the other end of the T2 electrode of bidirectional thyristor SCR1 and overvoltage crowbar input and the other end of overvoltage crowbar output also connect.
Overvoltage protective module of the present invention is based on the blocking characteristics of PR overcurrent block device, is that a kind of making is simple, and is with low cost, can bear special superpressure (＞130%), can realize again can recovery type self protective function module.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1; ac electric apparatus self recovery overvoltage protective module of the present invention; comprise a piezo-resistance ZR1; the end of this piezo-resistance ZR1 is connected in series the control utmost point that meets bidirectional thyristor SCR1 after the capacitor C 1; the T1 electrode of bidirectional thyristor SCR1 is taken over the end of current blocking circuit PR2; the end of the other end of overcurrent blocking circuit PR2 and overcurrent blocking circuit PR1 and the other end of piezo-resistance ZR1 and connect after be connected an end of overvoltage crowbar output again; the other end of overcurrent blocking circuit PR1 is taken over an end of voltage protection circuit input, and the other end of the T2 electrode of bidirectional thyristor SCR1 and overvoltage crowbar input and the other end of overvoltage crowbar output also connect.
When serious ultra-voltage takes place in this module, when promptly surpassing the threshold values of piezo-resistance ZR1, the action of ultra-voltage testing circuit; This moment, ZR1 and C1 provided triggering signal to bidirectional thyristor SCR1, forced the SCR1 conducting, realize ultra-voltage=＞conversion of supercurrent.After this purpose has 2, and the first reduces output voltage; It two is to force to reach PR1 supercurrent and within a short period of time blocking state, realizes the protection to output.The effect of C1 is a current limliting among Fig. 1.
Can force output voltage to reduce significantly after the blocking-up protection; thereby make output voltage be lower than the threshold values of ZR1; cause " ultra-voltage detection " circuit quit work (being that SCR1 loses triggering signal); the electric current of PR1 is reduced significantly, cause the blocking-up degree of PR1 to reduce output voltage and increase gradually.When output voltage reaches the threshold values of ZR1, begin again the ultra-voltage of a new round=＞conversion of supercurrent=＞the PR1 blocking-up.
Therefore this module takes place can produce the periodic voltage (than low value) that amplitude changes at outlet side after the blocking-up protection, and the equipment that is connected outlet side is periodically powered, and produces flicker effect, points out this equipment to be in [ultra-voltage] state.
PR overcurrent block device provided by the invention is realized can recovery type blocking type ultra-voltage holding circuit, and comprise: PR overcurrent blocking circuit, overvoltage detection circuit and overvoltage are to the change-over circuit of overcurrent.
When specifically implementing foregoing circuit, comprise following main points:
(1) based on " Curie temperature " characteristic of thermistor, a kind of overcurrent blocking circuit of design normally presents low-resistance (tens ohm) state, presents high resistant (near kilohm) state during overcurrent.To reach " Curie temperature " very soon when having served as current work, present high-impedance state.
(2) be the main outlet side overvoltage detection circuit of forming with the piezo-resistance, provide overvoltage signal when surpassing threshold value, close overvoltage signal when being lower than threshold values, " disconnection " state when " closure " state when promptly providing overvoltage and not overvoltage.
(3) with the bidirectional thyristor be the main conversion circuit of forming overvoltage to overcurrent.This circuit is controlled by the control of overvoltage detection circuit, triggers bidirectional thyristor when overvoltage detection circuit sends " closure " signal, overvoltage is changed into flow through the overcurrent of PR1.
Circuit provided by the invention has excellent overvoltage blocking characteristics, and the resistance value between high resistant, the low-resistance two states can satisfy the blocking-up requirement of practical application than＞20 times; Wherein low resistive state is a normal operating condition, and high-impedance state is the ultra-voltage blocking state.
The PR1 of comprising overcurrent block device of the present invention is realized and can recovery type blocking type ultra-voltage holding circuit method not only have been kept making simple, characteristics such as cost is low, reliability height, and can realize repeating work, the 3min that can have a power failure after the ultra-voltage blocking-up can recover.
Claims (1)
1. ac electric apparatus self recovery overvoltage protective module; it is characterized in that; this overvoltage protective module comprises: a piezo-resistance ZR1; the end of this piezo-resistance ZR1 is connected in series the control utmost point that meets bidirectional thyristor SCR1 after the capacitor C 1; the T1 electrode of bidirectional thyristor SCR1 is taken over the end of current blocking circuit PR2; the end of the other end of overcurrent blocking circuit PR2 and overcurrent blocking circuit PR1 and the other end of piezo-resistance ZR1 and connect after be connected an end of overvoltage crowbar output again; the other end of overcurrent blocking circuit PR1 is taken over an end of voltage protection circuit input, and the other end of the T2 electrode of bidirectional thyristor SCR1 and overvoltage crowbar input and the other end of overvoltage crowbar output also connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101740989A CN102227083A (en) | 2011-06-24 | 2011-06-24 | Self-recovery overvoltage protection module for AC electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101740989A CN102227083A (en) | 2011-06-24 | 2011-06-24 | Self-recovery overvoltage protection module for AC electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102227083A true CN102227083A (en) | 2011-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101740989A Pending CN102227083A (en) | 2011-06-24 | 2011-06-24 | Self-recovery overvoltage protection module for AC electric appliance |
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| CN (1) | CN102227083A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583675A (en) * | 2016-12-23 | 2022-06-03 | Ripd知识产权发展有限公司 | Device for active overvoltage protection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2101960U (en) * | 1991-09-12 | 1992-04-15 | 刘永生 | Over-pressure automatic protector for domestic electric appliance |
| CN2549640Y (en) * | 2002-06-18 | 2003-05-07 | 郑天良 | Breakable kelong module security unit |
| CN101212193A (en) * | 2006-12-27 | 2008-07-02 | 谭琦 | Motor starter for mini-type refrigeration compressor |
| CN201435703Y (en) * | 2009-06-01 | 2010-03-31 | 杭州星帅尔电器有限公司 | Electronic starter with low power consumption |
| CN201541222U (en) * | 2009-08-11 | 2010-08-04 | 贵州凯里经济开发区中昊电子有限公司 | energy-saving motor starter |
-
2011
- 2011-06-24 CN CN2011101740989A patent/CN102227083A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2101960U (en) * | 1991-09-12 | 1992-04-15 | 刘永生 | Over-pressure automatic protector for domestic electric appliance |
| CN2549640Y (en) * | 2002-06-18 | 2003-05-07 | 郑天良 | Breakable kelong module security unit |
| CN101212193A (en) * | 2006-12-27 | 2008-07-02 | 谭琦 | Motor starter for mini-type refrigeration compressor |
| CN201435703Y (en) * | 2009-06-01 | 2010-03-31 | 杭州星帅尔电器有限公司 | Electronic starter with low power consumption |
| CN201541222U (en) * | 2009-08-11 | 2010-08-04 | 贵州凯里经济开发区中昊电子有限公司 | energy-saving motor starter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583675A (en) * | 2016-12-23 | 2022-06-03 | Ripd知识产权发展有限公司 | Device for active overvoltage protection |
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Application publication date: 20111026 |