CN112230031A - Overvoltage protection circuit design for three-phase meter - Google Patents
Overvoltage protection circuit design for three-phase meter Download PDFInfo
- Publication number
- CN112230031A CN112230031A CN201911325621.6A CN201911325621A CN112230031A CN 112230031 A CN112230031 A CN 112230031A CN 201911325621 A CN201911325621 A CN 201911325621A CN 112230031 A CN112230031 A CN 112230031A
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- CN
- China
- Prior art keywords
- voltage
- circuit
- overvoltage
- capacitor
- overvoltage protection
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Abstract
The invention discloses an overvoltage protection circuit design for a three-phase meter, and a circuit schematic diagram of the overvoltage protection circuit is shown in figure 2. The circuit mainly comprises: the voltage stabilizing tube is used for stabilizing voltage, the divider resistor is used for dividing and stabilizing voltage, and the cross-over capacitor is used for transmitting voltage change, so that the functions of overvoltage protection and voltage stabilization output are achieved. The specific protection process of the circuit is as follows: when the VDAC generates an overvoltage phenomenon due to surge and other reasons, voltage change is quickly transmitted to the other end of the capacitor due to the characteristic of the capacitor, so that leakage current of the voltage stabilizing tube is increased, the voltage drop of a front-end voltage dividing resistor is increased, residual voltage is shared in the front-end circuit, damage to the rear-end circuit due to overvoltage is reduced, and the effect of protecting rear-end devices is achieved.
Description
Technical Field
The invention belongs to the field of intelligent electric energy meters, and particularly relates to a three-phase meter designed by an overvoltage protection circuit.
Background
At present, in a partial direct current circuit of a three-phase meter, the difficulty of designing an overvoltage protection circuit cannot give consideration to the protection of overvoltage conditions and ensure the voltage fluctuation of output voltage, and meanwhile, even if the aim is achieved, the circuit design cost is too high, and the layout difficulty of a circuit board is increased. Therefore, a reasonable design mode of the overvoltage protection circuit for the three-phase meter is designed to meet the requirements of overvoltage protection and voltage fluctuation of output voltage.
Disclosure of Invention
The invention aims to provide an overvoltage protection circuit design for a three-phase meter, wherein a switching MOS (metal oxide semiconductor) tube with high voltage-withstanding value allowance is selected according to actual requirements in the aspect of device selection, a voltage-stabilizing tube is also calculated according to a circuit to obtain a proper value, and two key performances of output voltage fluctuation and impact current are considered in the selection of a cross-over capacitor.
The technical scheme adopted by the invention comprises the following steps: the voltage stabilizing tube is used for stabilizing voltage, the divider resistor is used for dividing and stabilizing voltage, and the cross-over capacitor is used for transmitting voltage change, so that the functions of overvoltage protection and voltage stabilization output are achieved.
The specific protection process of the circuit is as follows: when the VDAC generates an overvoltage phenomenon due to surge and other reasons, voltage change is quickly transmitted to the other end of the capacitor due to the characteristic of the capacitor, so that leakage current of the voltage stabilizing tube is increased, the voltage drop of a front-end voltage dividing resistor is increased, residual voltage is shared in the front-end circuit, damage to the rear-end circuit due to overvoltage is reduced, and the effect of protecting rear-end devices is achieved.
The invention has been widely applied to the protection circuit of the three-phase meter, and can play a good countermeasure and protection measure for the overvoltage generated by the surge.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Detailed Description
As shown in fig. 1, the present invention provides an over-voltage protection circuit design.
The technical scheme adopted by the invention comprises the following steps: the voltage stabilizing tube is used for stabilizing voltage, the divider resistor is used for dividing and stabilizing voltage, and the cross-over capacitor is used for transmitting voltage change, so that the functions of overvoltage protection and voltage stabilization output are achieved.
When the VDAC generates an overvoltage phenomenon due to surge and the like, the voltage change is quickly transmitted to the other end of the capacitor due to the characteristic of the capacitor, so that the leakage current of the voltage stabilizing tube is increased, the voltage drop of the front-end voltage dividing resistor is increased, the residual voltage is shared in the front-end circuit, the damage of overvoltage to the rear-end circuit is reduced, and the protection effect on rear-end devices is achieved
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. The overvoltage protection circuit which has high-end voltage limiting function in a three-phase meter circuit is characterized in that:
a. the circuit has a plurality of resistors for voltage division protection of the back-end circuit. b. The voltage stabilizing tubes stabilize voltage, and the MOS tubes prevent overvoltage from being transmitted and play a role in switching the output of the circuit. d. The cross-over capacitor acts to transfer voltage quickly.
2. According to the claim 1, when an overvoltage event occurs outside, the voltage is quickly transmitted through the crossover capacitor, so that an overvoltage signal is quickly transmitted to the voltage stabilizing tube, the leakage current of the voltage stabilizing tube is increased, the voltage dividing function of the front-end voltage dividing resistor is increased, and overvoltage residual voltage is prevented from being transmitted to the rear-end circuit.
3. The method as claimed in claim 1, wherein the breakdown voltage of the switching MOS transistor is selected to have a sufficient margin due to the overvoltage, so as to prevent the overvoltage switching MOS from being broken down.
4. The capacitance of the capacitor of claim 1 is selected to allow for fast voltage transfer without affecting the voltage output during steady state operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325621.6A CN112230031A (en) | 2019-12-20 | 2019-12-20 | Overvoltage protection circuit design for three-phase meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325621.6A CN112230031A (en) | 2019-12-20 | 2019-12-20 | Overvoltage protection circuit design for three-phase meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112230031A true CN112230031A (en) | 2021-01-15 |
Family
ID=74111713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911325621.6A Withdrawn CN112230031A (en) | 2019-12-20 | 2019-12-20 | Overvoltage protection circuit design for three-phase meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112230031A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2565182Y (en) * | 2002-07-22 | 2003-08-06 | 华为技术有限公司 | Thunder-preventing protective circuit |
| CN102324721A (en) * | 2011-10-11 | 2012-01-18 | 刘喆 | Overvoltage automatic power off device for 220V alternating current |
| CN203787956U (en) * | 2014-04-23 | 2014-08-20 | 深圳市时代创新科技有限公司 | Surge voltage suppression circuit |
| CN203911471U (en) * | 2014-06-12 | 2014-10-29 | 四川联友电讯技术有限公司 | Communication base station controller with overvoltage protection |
| CN104362608A (en) * | 2014-12-03 | 2015-02-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage suppression and under-voltage surge detection circuit |
| CN206323122U (en) * | 2016-12-15 | 2017-07-11 | 广州视源电子科技股份有限公司 | PFC overvoltage crowbars |
| CN108153366A (en) * | 2018-02-27 | 2018-06-12 | 上海灿瑞科技股份有限公司 | A kind of overvoltage crowbar |
| CN110086143A (en) * | 2019-06-12 | 2019-08-02 | 上海艾为电子技术股份有限公司 | Input voltage bleeder circuit and overvoltage protection switch |
-
2019
- 2019-12-20 CN CN201911325621.6A patent/CN112230031A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2565182Y (en) * | 2002-07-22 | 2003-08-06 | 华为技术有限公司 | Thunder-preventing protective circuit |
| CN102324721A (en) * | 2011-10-11 | 2012-01-18 | 刘喆 | Overvoltage automatic power off device for 220V alternating current |
| CN203787956U (en) * | 2014-04-23 | 2014-08-20 | 深圳市时代创新科技有限公司 | Surge voltage suppression circuit |
| CN203911471U (en) * | 2014-06-12 | 2014-10-29 | 四川联友电讯技术有限公司 | Communication base station controller with overvoltage protection |
| CN104362608A (en) * | 2014-12-03 | 2015-02-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage suppression and under-voltage surge detection circuit |
| CN206323122U (en) * | 2016-12-15 | 2017-07-11 | 广州视源电子科技股份有限公司 | PFC overvoltage crowbars |
| CN108153366A (en) * | 2018-02-27 | 2018-06-12 | 上海灿瑞科技股份有限公司 | A kind of overvoltage crowbar |
| CN110086143A (en) * | 2019-06-12 | 2019-08-02 | 上海艾为电子技术股份有限公司 | Input voltage bleeder circuit and overvoltage protection switch |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210115 |