CN103326344B - A kind of overvoltage limiting circuit - Google Patents
A kind of overvoltage limiting circuit Download PDFInfo
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- CN103326344B CN103326344B CN201310277234.6A CN201310277234A CN103326344B CN 103326344 B CN103326344 B CN 103326344B CN 201310277234 A CN201310277234 A CN 201310277234A CN 103326344 B CN103326344 B CN 103326344B
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Abstract
A kind of overvoltage limiting circuit, this circuit is be connected to diode D1 ~ D5, electric capacity C1 ~ C3 on the power electrical apparatus power supply that need protect; electrochemical capacitor CD1, resistance R1 ~ R9, potentiometer RW; amplifier IC1, the electronic switching device O1 of field effect transistor or such as IGBT, triode.Transient voltage can be clamped down on fast absorption in this overvoltage limiting circuit work also can by its energy ezpenditure to protect electric equipment; specifically; can the suppression transient voltage of fast and reliable, particularly powerful transient voltage impacts, and setting only consumes very little electric energy under suppressing magnitude of voltage.For repetition high voltage pulse and long-term transient voltage, this overvoltage limiting circuit also has good inhibitory action.
Description
Technical field
The present invention relates to a kind of protective circuit, particularly relate to a kind of overvoltage limiting circuit.
Background technology
In existing power supply grid, often can there is various high-voltage pulse because of a variety of causes as the access of thunder and lightning, other electric equipment.In addition, in the circuit that inverter is powered, sometimes also there will be high-voltage pulse.
The interference of various high-voltage pulse can make power consumption equipment cisco unity malfunction, and it is to damaging power consumption equipment sometimes.In order to protect power consumption equipment safety, normally work, gas discharge tube, piezo-resistance, transient voltage suppressor diode or capacitance-resistance in prior art, is usually adopted to connect the protective circuits such as absorption to suppress this interference in circuit.But the suppression power of gas discharge tube, piezo-resistance, transient voltage suppressor diode is less, and repeatedly repeats to disturb and easily damage gas discharge tube, piezo-resistance, transient voltage suppressor diode.In addition; there is a critical defect in gas discharge tube, piezo-resistance, transient voltage suppressor diode, has negative resistance charactertistic exactly, often can under high voltage pulse impacts moment resistance decreasing; high resistant can not be recovered at pressure limiting point immediately, become the low-resistance load of power supply circuits and burnt out by big current.And capacitance-resistance series connection absorbing circuit also exists the problem of the normal power source energy consuming circuit, if when the transient voltage absorbing relatively high power impacts, the consumption of this energy will become very large.
Therefore, how can be the suppression transient voltage of fast and reliable, and suppress powerful transient voltage to impact, under suppression magnitude of voltage, only consume very little electric energy becomes the problem needing solution badly simultaneously.
Summary of the invention
The object of the invention is to propose a kind of overvoltage limiting circuit, this circuit can function as follows: 1. the transient voltage inhibitory action of fast and reliable: 2. powerful transient voltage can be suppressed to impact: 3. setting only consumes very little electric energy under suppressing magnitude of voltage.
For reaching this object, the present invention by the following technical solutions:
A kind of overvoltage limiting circuit, comprise: binding post 220V1 (1) is connected with the positive pole of diode D1 (3) and the negative pole of diode D2 (23), the negative pole of diode D1 (3) and the negative pole of diode D3 (4), the positive pole of electrochemical capacitor CD1 (5), one end of electric capacity C1 (6), one end of resistance R1 (7), one end of resistance R6 (10) connects, binding post 220V2 (2) is connected with the positive pole of diode D3 (4) and the negative pole of diode D4 (22), the positive pole of diode D2 (23) and the positive pole of diode D4 (22), the negative pole of electrochemical capacitor CD1 (5), the other end of electric capacity C1 (6), the other end of electric capacity C2 (9), the other end of resistance R2 (18), the other end of resistance R5 (17), the other end of resistance R7 (14), the other end of resistance R9 (19) connects, and be connected to the negative pole VS of the first DC power supply, the other end of resistance R1 (7) and the negative pole of diode D5 (21), one end of potentiometer RW (8) connects, one end of electric capacity C2 (9) and the normal phase input end of amplifier IC1 (11), the central slide end of potentiometer RW (8) connects, the positive pole of diode D5 (21) and one end of resistance R8 (20), one end of resistance R9 (19) connects, the other end of potentiometer RW (8) and one end of resistance R2 (18) connect, the negative-phase input of amplifier IC1 (11) and one end of resistance R3 (12), one end of electric capacity C3 (15), one end of resistance R5 (17), one end of resistance R4 (16) connects, the other end of resistance R4 (16), the other end of resistance R8 (20) connects with the positive pole VC of the first DC power supply, the output of amplifier IC1 (11) and the other end of resistance R3 (12), the other end of electric capacity C3 (15), the grid of switching device O1 (13) connects, the other end of resistance R6 (10) and the drain electrode of switching device O1 (13) connect, the source electrode of switching device O1 (13) and one end of resistance R7 (14) connect, described binding post is the power supply of the electric equipment that need protect.
Especially, described switching device O1 is field effect transistor, IGBT pipe or triode.
Especially, described amplifier IC1 is powered by the second DC power supply.
By above-mentioned overvoltage limiting circuit, can the suppression transient voltage of fast and reliable, particularly powerful transient voltage impacts, and setting only consumes very little electric energy under suppressing magnitude of voltage.
Accompanying drawing explanation
Fig. 1 is according to the circuit diagram of the overvoltage limiting circuit of the embodiment of the present invention.
The technical characteristic that Reference numeral in figure refers to respectively is:
1, binding post 220V1:2, binding post 220V2:3, diode D1:4, diode D3:5, electrochemical capacitor CD1:6, electric capacity C1:7, resistance R1:8, potentiometer RW:9, electric capacity C2:10, resistance R6:11, amplifier IC1:12, resistance R3:13, switching device O1:14, resistance R7:15, electric capacity C3:16, resistance R4:17, resistance R5:18, resistance R2:19, resistance R9:20, resistance R8:21, diode D5:22, diode D4:23, diode D2.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
See accompanying drawing 1, disclose overvoltage limiting circuit according to a particular embodiment of the invention.
Circuit of the present invention as shown in Figure 1, its structure is that binding post 220V1 (1) is connected with the positive pole of diode D1 (3) and the negative pole of diode D2 (23), the negative pole of diode D1 (3) and the negative pole of diode D3 (4), the positive pole of electrochemical capacitor CD1 (5), one end of electric capacity C1 (6), one end of resistance R1 (7), one end of resistance R6 (10) connects, binding post 220V2 (2) is connected with the positive pole of diode D3 (4) and the negative pole of diode D4 (22), the positive pole of diode D2 (23) and the positive pole of diode D4 (22), the negative pole of electrochemical capacitor CD1 (5), the other end of electric capacity C1 (6), the other end of electric capacity C2 (9), the other end of resistance R2 (18), the other end of resistance R5 (17), the other end of resistance R7 (14), the other end of resistance R9 (19) connects, and be connected to the negative pole VS of the first DC power supply, the other end of resistance R1 (7) and the negative pole of diode D5 (21), one end of potentiometer RW (8) connects, one end of electric capacity C2 (9) and the normal phase input end of amplifier IC1 (11), the central slide end of potentiometer RW (8) connects, the positive pole of diode D5 (21) and one end of resistance R8 (20), one end of resistance R9 (19) connects, the other end of potentiometer RW (8) and one end of resistance R2 (18) connect, the negative-phase input of amplifier IC1 (11) and one end of resistance R3 (12), one end of electric capacity C3 (15), one end of resistance R5 (17), one end of resistance R4 (16) connects, the other end of resistance R4 (16), the other end of resistance R8 (20) connects with the positive pole VC of the first DC power supply, the output of amplifier IC1 (11) and the other end of resistance R3 (12), the other end of electric capacity C3 (15), the grid of switching device O1 (13) connects, the other end of resistance R6 (10) and the drain electrode of switching device O1 (13) connect, the source electrode of switching device O1 (13) and one end of resistance R7 (14) connect, described binding post 220V1 and 220V2 is the power supply of the electric equipment that need protect.
Amplifier IC1 can be powered by DC power supply, preferably, adopts the second DC power supply (not shown) being different from the first DC power supply to power.
The operation principle of this circuit is as follows: diode D1 (3) in circuit, D2 (23), D3 (4), D4 (22) forms full-wave rectifier, electrochemical capacitor CD1 (5), electric capacity C1 (6) forms transient voltage Absorption Capacitance, resistance R1 (7), R2 (18), R3 (12), R4 (16), R5 (17), R6 (10), R7 (14), R8 (20), R9 (19), potentiometer RW (8), electric capacity C2 (9), amplifier IC1 (11), switching device O1 (13) and diode D5 (21) forms rheostat transient voltage energy consumption device.Resistance R8 (20), R9 (19), diode D5 (21) provide a start bias for amplifier IC1 (11), prevent the operation irregularity that amplifier IC1 (11) likely occurs when circuit start.
Transient voltage is accessed transient voltage Absorption Capacitance two ends by full-wave rectifier, because the voltage at transient voltage Absorption Capacitance two ends can not suddenly change, so just clamp down on disturbing pulse fast, if transient voltage continue to rise make the voltage at transient voltage Absorption Capacitance two ends be increased to restriction point upper time, rheostat transient voltage energy consumption device will start conducting, and the continuation of the voltage at restriction transient voltage Absorption Capacitance two ends raises.In use, the design parameter of each element in this overvoltage limiting circuit can be selected according to actual needs, make overvoltage limiting circuit have different high-power transient voltage absorptions.Like this, this circuit can realize the transient voltage inhibitory action of fast and reliable, and powerful transient voltage also can be suppressed to impact.
In addition, this overvoltage limiting circuit only needs circuit that the voltage of transient voltage Absorption Capacitance is charged to operating voltage in connection process, only consumes little circuit electric energy later.Can find out from the operation principle of this circuit, this circuit, for repetition high voltage pulse and long-term transient voltage, also has good inhibitory action.
And can find out from the work characteristics of this circuit, this circuit for lower than normal power supply voltage peak disturbing pulse or restriction point under disturbing pulse unrestraint effect, namely under the effect of little disturbing pulse (when being no more than limit value), only clamped down on by Absorption Capacitance, transient voltage energy consumption device does not put into operation, and this is also another characteristics of energy saving of this overvoltage limiting circuit.
The switching device O1 that shows adopting field effect transistor exemplary is in fig. 1 field effect transistor, but it should be understood that this switching device O1 also can manage for IGBT, and triode, it also can play identical effect.
Therefore, by above-mentioned overvoltage limiting circuit, can the suppression transient voltage of fast and reliable, particularly powerful transient voltage impacts, and setting only consumes very little electric energy under suppressing magnitude of voltage.
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination protection range.
Claims (3)
1. an overvoltage limiting circuit, is characterized in that:
Binding post 220V1 (1) is connected with the positive pole of diode D1 (3) and the negative pole of diode D2 (23), the negative pole of diode D1 (3) and the negative pole of diode D3 (4), the positive pole of electrochemical capacitor CD1 (5), one end of electric capacity C1 (6), one end of resistance R1 (7), one end of resistance R6 (10) connects, binding post 220V2 (2) is connected with the positive pole of diode D3 (4) and the negative pole of diode D4 (22), the positive pole of diode D2 (23) and the positive pole of diode D4 (22), the negative pole of electrochemical capacitor CD1 (5), the other end of electric capacity C1 (6), the other end of electric capacity C2 (9), the other end of resistance R2 (18), the other end of resistance R5 (17), the other end of resistance R7 (14), the other end of resistance R9 (19) connects, and be connected to the negative pole of the first DC power supply, the other end of resistance R1 (7) and the negative pole of diode D5 (21), one end of potentiometer RW (8) connects, one end of electric capacity C2 (9) connects with the normal phase input end of amplifier IC1 (11) and the central slide end of potentiometer RW (8) respectively, the positive pole of diode D5 (21) and one end of resistance R8 (20), one end of resistance R9 (19) connects, the other end of potentiometer RW (8) and one end of resistance R2 (18) connect, the negative-phase input of amplifier IC1 (11) and one end of resistance R3 (12), one end of electric capacity C3 (15), one end of resistance R5 (17), one end of resistance R4 (16) connects, the other end of resistance R4 (16), the other end of resistance R8 (20) connects with the positive pole of the first DC power supply, the output of amplifier IC1 (11) and the other end of resistance R3 (12), the other end of electric capacity C3 (15), the grid of switching device Q1 (13) connects, the other end of resistance R6 (10) and the drain electrode of switching device Q1 (13) connect, the source electrode of switching device Q1 (13) and one end of resistance R7 (14) connect, described binding post 220V1 (1), 220V2 (2) is the power supply of the electric equipment that need protect.
2. overvoltage limiting circuit according to claim 1, is characterized in that:
Described switching device Q1 (13) is field effect transistor, IGBT manages or triode.
3. overvoltage limiting circuit according to claim 1, is characterized in that:
Described amplifier IC1 (11) is powered by the second DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310277234.6A CN103326344B (en) | 2013-07-03 | 2013-07-03 | A kind of overvoltage limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310277234.6A CN103326344B (en) | 2013-07-03 | 2013-07-03 | A kind of overvoltage limiting circuit |
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| Publication Number | Publication Date |
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| CN103326344A CN103326344A (en) | 2013-09-25 |
| CN103326344B true CN103326344B (en) | 2015-10-28 |
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| CN201310277234.6A Expired - Fee Related CN103326344B (en) | 2013-07-03 | 2013-07-03 | A kind of overvoltage limiting circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037724A (en) * | 2014-06-12 | 2014-09-10 | 四川联友电讯技术有限公司 | Overvoltage protection communication base station |
| CN104052046A (en) * | 2014-06-12 | 2014-09-17 | 四川联友电讯技术有限公司 | High-reliability communication base station controller |
| CN109921400B (en) * | 2019-04-03 | 2021-08-17 | 昆山通达测科电子科技有限公司 | High-speed high-power surge voltage suppression circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202696138U (en) * | 2012-06-05 | 2013-01-23 | 江苏固德威电源科技有限公司 | Excess voltage absorption protection circuit capable of accurately presetting protection value |
| CN103141002A (en) * | 2010-07-30 | 2013-06-05 | 霍廷格·鲍德温测量技术有限责任公司 | Protective circuit |
| CN203026930U (en) * | 2012-11-26 | 2013-06-26 | 西安威正电子科技有限公司 | Circuit for solving voltage overload of input port of operational amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8780515B2 (en) * | 2008-12-18 | 2014-07-15 | System General Corp. | Control circuit with protection circuit for power supply |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103141002A (en) * | 2010-07-30 | 2013-06-05 | 霍廷格·鲍德温测量技术有限责任公司 | Protective circuit |
| CN202696138U (en) * | 2012-06-05 | 2013-01-23 | 江苏固德威电源科技有限公司 | Excess voltage absorption protection circuit capable of accurately presetting protection value |
| CN203026930U (en) * | 2012-11-26 | 2013-06-26 | 西安威正电子科技有限公司 | Circuit for solving voltage overload of input port of operational amplifier |
Non-Patent Citations (1)
| Title |
|---|
| 多端口过压安全保护电路设计与研究;李春飞等;《信息安全与技术》;20111231;第17-20页 * |
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Inventor after: Liu Lianguang Inventor after: Jiang Zhihua Inventor after: Zheng Kuan Inventor after: Chen Yanwei Inventor after: Wang Kairang Inventor after: Ge Xiaoning Inventor before: Liu Lianguang Inventor before: Zheng Kuan Inventor before: Chen Yanwei |
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Granted publication date: 20151028 Termination date: 20200703 |
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