CN203086328U - Intelligent power grid terminal power input surge suppression circuit - Google Patents
Intelligent power grid terminal power input surge suppression circuit Download PDFInfo
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- CN203086328U CN203086328U CN 201220647086 CN201220647086U CN203086328U CN 203086328 U CN203086328 U CN 203086328U CN 201220647086 CN201220647086 CN 201220647086 CN 201220647086 U CN201220647086 U CN 201220647086U CN 203086328 U CN203086328 U CN 203086328U
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Abstract
The utility model provides an intelligent power grid terminal power input surge suppression circuit and relates to the field of a switching power supply of an electric power system. The circuit is composed of input terminals, current-limiting resistors, a rectification circuit, a thermistor, a filter circuit, a converter, and output terminals. The current-limiting resistors are connected between the input terminals and input terminals of the rectification circuit. A first terminal of the thermistor is connected with a first direct-current output terminal of the rectification circuit, and a second terminal of the thermistor is simultaneously connected with an input terminal of the filter circuit and an input terminal of the converter. An output terminal of the filter circuit is connected with an output terminal of the converter and then connected with a second direct-current output terminal of the rectification circuit. The circuit realizes the suppression of surge current by virtue of connecting the current-limiting resistors in series with the electricity input terminals; the circuit is simple in line and prevents the power supply from being burnt out due to surges; and the circuit realizes the surge protection of the switching power supply and increases the equipment security.
Description
Technical field
The utility model relates to the electric power system field of switch power, relates in particular to a kind of surge protection circuit of power supply such as acquisition terminal, three-phase load control terminal in three-phase intelligent ammeter, the three-phase set.
Background technology
90% all was to cause whole power supply to burn owing to the input rectifying diode burns during acquisition terminal, three-phase load control terminal Switching Power Supply were damaged in the past three-phase intelligent ammeter, three-phase set, had caused many security incidents.When large-scale inductance, capacitive load (as large-size machine etc.) when carrying out the switching action, can produce the surge voltage that sharply rises, to the big electric capacity charging of the input filtering of Switching Power Supply in the equipment, thereby produce very large moment input current, cause rectifier diode to burn.
In order to suppress surge current, improve the reliability of Switching Power Supply, general surge protection method is the thermistor that is connected a negative temperature coefficient between the rectification circuit output end of Switching Power Supply and filter capacitor.This method circuit is simple, and cost is very low.But when power work or ambient temperature were high, it is very little that the resistance of thermistor can become, and can not play the effect of current limliting, if switching is carried out in large-scale inductance capacitance load this moment, diode can't be protected.
The utility model content
The purpose of this utility model is to propose a kind of intelligent grid terminal power supply input surge restraint circuit, can reduce surge current in large-scale inductance, capacitive load generation when carrying out the switching action, avoid diode to be burnt out because of electric current is excessive, especially acquisition terminal, three-phase load control terminal Switching Power Supply input diode are burnt in three-phase intelligent ammeter, the three-phase set.
For reaching this purpose, the utility model by the following technical solutions:
A kind of intelligent grid terminal power supply input surge restraint circuit comprises input, current-limiting resistance, rectification circuit, thermistor, filter circuit, converter, output;
Described current-limiting resistance is connected between described input and the described rectification circuit input end; First end of described thermistor is exported first end with the direct current of described rectification circuit and is connected, and second end of described thermistor connects the input of described filter circuit and the input of described converter simultaneously; The output of described filter circuit is exported second end with the direct current of described rectification circuit again and is linked to each other with after the output of described converter is connected;
Described input is connected with the three-phase alternating-current supply that electric power system provides.
Described three-phase alternating-current supply adopts three-phase four-wire system, comprises first phase line, second phase line, third phase line, zero line.
Described first phase line is connected with an end of first resistance of described current-limiting resistance, and second phase line is connected with an end of second resistance of described current-limiting resistance, and the third phase line is connected with an end of the 3rd resistance of described current-limiting resistance.
Described rectification circuit is the single-phase full-wave rectifer circuit that is connected and composed by eight diode bridge types.
Described rectification circuit has that four ac input ends, described direct current are exported first end, described direct current is exported second end;
First end of described four ac input ends is connected with the other end of described first resistance of described current-limiting resistance, second end of described four ac input ends is connected with the other end of described second resistance of described current-limiting resistance, the 3rd end of described four ac input ends is connected with the other end of described the 3rd resistance of described current-limiting resistance, and the 4th end of described four ac input ends is connected with the zero line of described three-phase alternating-current supply.
Described filter circuit is connected in series by first electrochemical capacitor and second electrochemical capacitor and constitutes; The negative pole of described first electrochemical capacitor is connected with the positive pole of described second electrochemical capacitor; The positive pole of described first electrochemical capacitor connects the described input of described filter circuit; The negative pole of described second electrochemical capacitor connects the described output of described filter circuit.
The technical solution of the utility model adopts the input series limiting resistor in switching power circuit; can reduce surge current in large-scale inductance, capacitive load generation when carrying out the switching action; thereby avoided diode to be burnt out because of electric current is excessive; especially acquisition terminal, three-phase load control terminal Switching Power Supply input diode are burnt in three-phase intelligent ammeter, the three-phase set, have realized the surge protection to Switching Power Supply.This surge restraint circuit is simple, and cost is low, and has avoided former thereby burn power supply because of surge, has improved device '.
Description of drawings
Fig. 1 is the intelligent grid terminal power supply input surge restraint circuit schematic diagram that the utility model embodiment provides.
Embodiment
Further specify the technical solution of the utility model below in conjunction with accompanying drawing and by embodiment.
Fig. 1 is the intelligent grid terminal power supply input surge restraint circuit schematic diagram that the utility model embodiment provides.
As shown in Figure 1, a kind of intelligent grid terminal power supply input surge restraint circuit comprises four input A, B, C, D, three current-limiting resistance R1, R2, R3, rectification circuit 1, thermistor TH1, filter circuit 2, converter, output.Circuit suppresses surge current by in the input series limiting resistor.
Four inputs are connected with the three-phase alternating-current supply that electric power system provides, and this input comprises the first phase line end A, the second phase line end B, third phase line end C, zero line side N.
In three current-limiting resistances an end of first resistance R 1 and first mutually line end A connect, an end of second resistance R 2 and the second line end B connection mutually, an end of the 3rd resistance R 3 is connected with third phase line end C.
Rectification circuit 1 is the single-phase full-wave rectifer circuit that is connected and composed by eight diode D1-D8 bridge types.This rectification circuit has four ac input end A1, B1, C1, N1, and direct current is exported the first end W1, and direct current is exported the second end W2.The first end A1 of four ac input ends is connected with the other end of first resistance R 1, the second end B1 of four ac input ends is connected with the other end of second resistance R 2, the 3rd end C1 of four ac input ends is connected with the other end of the 3rd resistance R 3, and the 4th end N1 of four ac input ends is zero line side N.
Direct current is exported the first end W1 and is connected in first end of thermistor TH1 and the rectification circuit 1, and second end connects the input of filter circuit 2 and the input of converter simultaneously.
Filter circuit 2 is connected in series by the first electrochemical capacitor C1 and the second electrochemical capacitor C2 and constitutes, the negative pole of the first electrochemical capacitor C1 is connected with the positive pole of the second electrochemical capacitor C2, the positive pole of the first electrochemical capacitor C1 connects the input of filter circuit 2, and the negative pole of second electrochemical capacitor connects the output of filter circuit 2.
The output of filter circuit 2 is exported the second end W2 with the direct current of rectification circuit 1 again and is linked to each other with after the output of converter is connected.
Thermistor TH1 is the thermistor of negative temperature coefficient.In the Switching Power Supply surge restraint circuit, thermistor TH1 resistance under normal conditions is very high, when input voltage moment increase, can limit the charging current to filter capacitor, has suppressed surge current.But when power work or ambient temperature were high, it is very little that thermistor TH1 resistance will become, and can't play the effect of current limliting, if this moment large-scale inductance or capacitive load generation switching, diode can't be protected.For the phenomenon of well avoiding the surge current breakdown diode takes place, the resistance of the fixed resistance value of connecting between the input of the input of switching power circuit and rectification circuit 1 is to reach the purpose of current limliting.When large-scale inductive load or large-scale capacitor load switching were arranged in the alternating current circuit, the surge voltage of the rapid rising of Chan Shenging was charged to electrochemical capacitor C1, electrochemical capacitor C2 by first resistance R 1, second resistance R 2, the 3rd resistance R 3 and diode D1-D8 thereupon.Resistance parameter at current-limiting resistance is provided with under the rational state, can make the electric current of circuit well below the high surge current of diode D1-D8, and diode D1-D8 just is not easy to damage.Wherein the resistance parameter of first resistance R 1, second resistance R 2, the 3rd resistance R 3 will design according to the maximum surge current of surge voltage the highest in the circuit and input diode.
The technical solution of the utility model adopts the input series limiting resistor in switching power circuit; can reduce surge current in large-scale inductance, capacitive load generation when carrying out the switching action; thereby avoided diode to be burnt out because of electric current is excessive; especially acquisition terminal, three-phase load control terminal Switching Power Supply input diode are burnt in three-phase intelligent ammeter, the three-phase set, have realized the surge protection to Switching Power Supply.This surge restraint circuit is simple, and cost is low, and has avoided former thereby burn power supply because of surge, has improved device '.
The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with the people of this technology in the disclosed technical scope of the utility model; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (7)
1. an intelligent grid terminal power supply is imported surge restraint circuit, it is characterized in that:
Described power supply input surge restraint circuit comprises input, current-limiting resistance, rectification circuit, thermistor, filter circuit, converter, output;
Described current-limiting resistance is connected between described input and the described rectification circuit input end; First end of described thermistor is exported first end with the direct current of described rectification circuit and is connected, and second end of described thermistor connects the input of described filter circuit and the input of described converter simultaneously; Exporting second end with the direct current of described rectification circuit after the output of described filter circuit is connected with the output of described converter links to each other.
2. intelligent grid terminal power supply input surge restraint circuit according to claim 1 is characterized in that described input is connected with the three-phase alternating-current supply that electric power system provides.
3. intelligent grid terminal power supply input surge restraint circuit according to claim 2 is characterized in that described three-phase alternating-current supply adopts three-phase four-wire system, comprises first phase line, second phase line, third phase line, zero line.
4. intelligent grid terminal power supply input surge restraint circuit according to claim 3, it is characterized in that, described first phase line is connected with an end of first resistance of described current-limiting resistance, second phase line is connected with an end of second resistance of described current-limiting resistance, and the third phase line is connected with an end of the 3rd resistance of described current-limiting resistance.
5. intelligent grid terminal power supply input surge restraint circuit according to claim 4 is characterized in that described rectification circuit is the single-phase full-wave rectifer circuit that is connected and composed by eight diode bridge types.
6. intelligent grid terminal power supply according to claim 5 input surge restraint circuit is characterized in that, described rectification circuit has that four ac input ends, described direct current are exported first end, described direct current is exported second end;
First end of described four ac input ends is connected with the other end of described first resistance of described current-limiting resistance, second end of described four ac input ends is connected with the other end of described second resistance of described current-limiting resistance, the 3rd end of described four ac input ends is connected with the other end of described the 3rd resistance of described current-limiting resistance, and the 4th end of described four ac input ends is connected with the zero line of described three-phase alternating-current supply.
7. intelligent grid terminal power supply input surge restraint circuit according to claim 1 is characterized in that described filter circuit is connected in series by first electrochemical capacitor and second electrochemical capacitor and constitutes; The negative pole of described first electrochemical capacitor is connected with the positive pole of described second electrochemical capacitor; The positive pole of described first electrochemical capacitor connects the described input of described filter circuit; The negative pole of described second electrochemical capacitor connects the described output of described filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647086 CN203086328U (en) | 2012-11-29 | 2012-11-29 | Intelligent power grid terminal power input surge suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647086 CN203086328U (en) | 2012-11-29 | 2012-11-29 | Intelligent power grid terminal power input surge suppression circuit |
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| Publication Number | Publication Date |
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| CN203086328U true CN203086328U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220647086 Expired - Fee Related CN203086328U (en) | 2012-11-29 | 2012-11-29 | Intelligent power grid terminal power input surge suppression circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100308A (en) * | 2016-08-15 | 2016-11-09 | 威胜集团有限公司 | The power circuit of anti-lightning surge and the measuring instrument made with this circuit |
| CN109660134A (en) * | 2018-12-21 | 2019-04-19 | 佛山市汉立电子科技有限公司 | Power circuit and input limiting resistance determine method |
| CN112511145A (en) * | 2020-12-04 | 2021-03-16 | 深圳市金威源科技股份有限公司 | Standby zero reactive power consumption control circuit in switching power supply |
| US12051966B2 (en) | 2021-03-31 | 2024-07-30 | Huawei Digital Power Technologies Co., Ltd. | Converter and on-board charger |
-
2012
- 2012-11-29 CN CN 201220647086 patent/CN203086328U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100308A (en) * | 2016-08-15 | 2016-11-09 | 威胜集团有限公司 | The power circuit of anti-lightning surge and the measuring instrument made with this circuit |
| CN109660134A (en) * | 2018-12-21 | 2019-04-19 | 佛山市汉立电子科技有限公司 | Power circuit and input limiting resistance determine method |
| CN112511145A (en) * | 2020-12-04 | 2021-03-16 | 深圳市金威源科技股份有限公司 | Standby zero reactive power consumption control circuit in switching power supply |
| US12051966B2 (en) | 2021-03-31 | 2024-07-30 | Huawei Digital Power Technologies Co., Ltd. | Converter and on-board charger |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20151129 |