CN2443524Y - AC input protector - Google Patents
AC input protector Download PDFInfo
- Publication number
- CN2443524Y CN2443524Y CN 00242576 CN00242576U CN2443524Y CN 2443524 Y CN2443524 Y CN 2443524Y CN 00242576 CN00242576 CN 00242576 CN 00242576 U CN00242576 U CN 00242576U CN 2443524 Y CN2443524 Y CN 2443524Y
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- CN
- China
- Prior art keywords
- switch
- relay switch
- surge
- hand member
- input
- 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
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Abstract
The utility model is the improvement of the input overvoltage / undervoltage protection and the surge current suppression device, which is composed of an overvoltage / undervoltage relay protection switch (J1-1), a surge protection switch (KK), a limiting resistor (R1) and a control circuit (KZ), wherein, the resistor (R1) is connected in series with the surge switch (KK) and then connected in parallel with the relay switch (J1-1). A power input loop which is connected in series in the switch power supply is provided with only one pair of relay contacts so as to reduce the power loss to a half.
Description
The utility model belongs to power technique fields, relates to the input protection of Switching Power Supply.
By the Switching Power Supply of mains-supplied, general requirement has input protection:
1. input overvoltage/under-voltage protection is relay switch K1 of series connection in ac input circuit, monitors input voltage by checkout gear, when input voltage is too high or too low, drives relay K 1 and turn-offs input circuit.
2. because the input rectifying of power supply part generally all has the filter capacitor of larger capacity, therefore in start moment, often have above the big electric current of rated current more than ten times, be so-called surge current, electrical network is caused bigger interference and pollution.For suppressing surge current, generally all be again the parallel network of power resistor R of string and relay switch K2 in ac input circuit; Under the effect of control circuit, during start, relay switch K2 disconnects, and the initial capacitance charging current is because the restriction of resistance, not too large, delay time after one section, when electric capacity is charged near normal working voltage, relay switch K2 connects, and with resistive short, circuit recovers operate as normal.More than with two relay switches carried out/method that under-voltage protection and surge current suppress is very general in present a lot of large power supplies, its effect is also very effective.But, because the switch of relay is not a perfect switch, exist 10m Ω contact resistance up and down between its contact inevitably, produce power loss.Under high-power situation, be 90% 3KW power supply as efficient, during for low limit value 176V, input current reaches 18.4A at input ac voltage, and the power loss of each relay switch contacts reaches 3.6W.
The purpose of this utility model provides a kind of input protection device with the less Switching Power Supply of input AC overvoltage/under-voltage protection and surge current inhibit feature and autophage.
Guiding theory of the present utility model is to change the input overvoltage/under-voltage protection relay switch K1 of series connection originally and surge inhibition relay switch K2 into parallel connection, so the power loss of contact reduces half.
Specifically scheme is, and is in parallel with the relay switch (J1-1) of overvoltage/under-voltage protection again after power resistor (R1) and surge switch (KK) series connection, and this integral body in parallel is concatenated in the ac input circuit.
Concrete connection is: the right-hand member of resistance (R1) links to each other with the left end of surge switch (KK); the left end of resistance (R1) links to each other the back as the end points N1 of this protective device with the left end of relay switch (J1-1), the right-hand member of surge switch (KK) links to each other with the right-hand member of relay switch (J1-1) afterwards as another end points N2 of this protective device.During application, N1, the N2 of this protective device end is connected in series in the ac input circuit gets final product.
Operation principle is as follows:
After the start, control circuit (KZ) is connected surge switch (KK), and resistance (R1) restriction input current is not too large, and when the filter capacitor charging voltage of level behind the power supply during near normal working voltage, relay switch (J1-1) closure is with (R1) short circuit; Subsequently, surge switch (KK) disconnects, and circuit enters normal operating conditions.When power work, if the variation of AC-input voltage exceeds bound, control circuit (KZ) will relay switch (J1-1), reaches the purpose of protection power supply.
Surge switch (KK) can use relay switch (J2-1), and relay switch (J1-1) and action (J2-1) are to be driven by the control circuit in the Switching Power Supply (KZ), and the design of concrete control circuit is the technology of common-sense in the industry, need not to give unnecessary details.
Surge switch (KK) also can change bidirectional triode thyristor (TRIAC) into, and this moment is as long as the pair of contact of replacing relay switch (J2-1) with the negative electrode K and the anode A of (TRIAC) is just passable.Certainly, the corresponding driving signal should change between the negative electrode K and control utmost point G that is added in bidirectional triode thyristor (TRIAC).Adopt bidirectional triode thyristor (TRIAC) to also have a benefit, can take the zero passage switch technology exactly, open-minded when alternating voltage is zero, under the cooperation of resistance R 1, make does not just have surge current at all.
The utility model has the advantages that protective device has only the relay switch of a series connection, thereby power loss reduces half.
Accompanying drawing 1 is existing input overvoltage/under voltage protection and surge current control device.
Accompanying drawing 2 is input overvoltage/under voltage protection and surge current control device principles that the utility model provides.
Accompanying drawing 3 is embodiment that the utility model uses relay switch, Fig. 3-the 1st wherein, and main circuit, Fig. 3-the 2nd, control circuit (KZ) is to the control signal of relay J 1, J2.
Accompanying drawing 4 is another embodiment that the utility model uses bidirectional triode thyristor.
Embodiment below in conjunction with accompanying drawing 3 is described in further detail this novel course of work:
Before the Switching Power Supply start, relay switch (J1-1) and (J2-1) all disconnects, after the start, control circuit (KZ) the detection input voltage in the machine, if too high or too low, two all still disconnection of relay switches; If input voltage is normal, control circuit (KZ) is connected (J2-1), resistance (R1) is limited input current, after time-delay a period of time, the filter capacitor charging voltage of Switching Power Supply is near normal working voltage, the output signal of control circuit (KZ) makes (J1-1) closure, with (R1) short circuit; Subsequently, relay switch (J2-1) also disconnects, and circuit enters normal operating conditions.
When operate as normal, if AC-input voltage changes, no matter exceed the upper limit or not enough lower limit, control circuit (KZ) all can output signal, and relay switch (J1-1) reaches the purpose of protection power supply.
Claims (3)
1, a kind of interchange protection input unit, it is made up of relay switch (J1-1), surge switch (KK), current-limiting resistance (R1) and control circuit (KZ), it is characterized in that:
The right-hand member of resistance (R1) links to each other with the left end of surge switch (KK); the left end of resistance (R1) links to each other the back as the end points N1 of this protective device with the left end of relay switch (J1-1), the right-hand member of surge switch (KK) links to each other with the right-hand member of relay switch (J1-1) afterwards as another end points N2 of this protective device.
2, according to claims 1 described interchange input protection device, it is characterized in that:
Surge switch (KK) uses relay switch (J2-1); relay switch (J2-1) left end links to each other with the right-hand member of resistance (R1), and the right-hand member of relay switch (J2-1) links to each other the back as another end points N2 of this protective device with the right-hand member of relay switch (J1-1).
3, according to claims 1 described interchange input protection device, it is characterized in that:
Surge switch (KK) uses bidirectional triode thyristor (TRIAC), and this moment, the anode A with bidirectional triode thyristor (TRIAC) linked to each other with the right-hand member of resistance (R1), and negative electrode K links to each other with the right-hand member of relay switch (J1-1) afterwards as another end points N2 of this protective device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00242576 CN2443524Y (en) | 2000-08-28 | 2000-08-28 | AC input protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00242576 CN2443524Y (en) | 2000-08-28 | 2000-08-28 | AC input protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2443524Y true CN2443524Y (en) | 2001-08-15 |
Family
ID=33602683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00242576 Expired - Fee Related CN2443524Y (en) | 2000-08-28 | 2000-08-28 | AC input protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2443524Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477439C (en) * | 2005-01-08 | 2009-04-08 | 艾默生网络能源系统有限公司 | Switching power supply with overvoltage protection and overvoltage protection method thereof |
| CN102064549A (en) * | 2009-11-11 | 2011-05-18 | 王海 | Switching method and switching switch circuit of AC capacitor |
| CN102270875A (en) * | 2011-07-14 | 2011-12-07 | 吴江多艺纺织有限公司 | Emergency lighting system protector |
| CN106786432A (en) * | 2017-01-18 | 2017-05-31 | 中国科学院电子学研究所 | A kind of electronic equipment switching device and method |
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
| CN110870154A (en) * | 2017-07-10 | 2020-03-06 | 东芝三菱电机产业系统株式会社 | Power conditioner, power system, and reactive power suppression method for power system |
-
2000
- 2000-08-28 CN CN 00242576 patent/CN2443524Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100477439C (en) * | 2005-01-08 | 2009-04-08 | 艾默生网络能源系统有限公司 | Switching power supply with overvoltage protection and overvoltage protection method thereof |
| CN102064549A (en) * | 2009-11-11 | 2011-05-18 | 王海 | Switching method and switching switch circuit of AC capacitor |
| CN102064549B (en) * | 2009-11-11 | 2016-03-16 | 王海 | AC capacitor operation/cutting method and fling-cut switch circuit |
| CN102270875A (en) * | 2011-07-14 | 2011-12-07 | 吴江多艺纺织有限公司 | Emergency lighting system protector |
| CN106786432A (en) * | 2017-01-18 | 2017-05-31 | 中国科学院电子学研究所 | A kind of electronic equipment switching device and method |
| CN110870154A (en) * | 2017-07-10 | 2020-03-06 | 东芝三菱电机产业系统株式会社 | Power conditioner, power system, and reactive power suppression method for power system |
| CN110870154B (en) * | 2017-07-10 | 2023-08-01 | 东芝三菱电机产业系统株式会社 | Power conversion device, power system, and method for suppressing reactive power in power system |
| CN110022053A (en) * | 2019-03-29 | 2019-07-16 | 合肥华耀电子工业有限公司 | It is a kind of to inhibit the three phase rectifier of function to protect circuit with inrush current |
| CN110022053B (en) * | 2019-03-29 | 2024-03-29 | 合肥华耀电子工业有限公司 | Three-phase rectification protection circuit with input surge current suppression function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or 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 |