CN111190046B - Surge counter - Google Patents
Surge counter Download PDFInfo
- Publication number
- CN111190046B CN111190046B CN202010043284.8A CN202010043284A CN111190046B CN 111190046 B CN111190046 B CN 111190046B CN 202010043284 A CN202010043284 A CN 202010043284A CN 111190046 B CN111190046 B CN 111190046B
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- Prior art keywords
- operational amplifier
- zener diode
- diode
- surge
- resistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
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- 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 provides a surge counter which comprises a bidirectional silicon controlled rectifier device, a first zener diode, a second zener diode, a first operational amplifier and a second operational amplifier, wherein the first end of the first zener diode is connected to the anode of a power supply, the second end of the first zener diode is grounded, the gate pole of the bidirectional silicon controlled rectifier device is connected to the second end of the first zener diode, the positive input end of the first operational amplifier is connected to a positive bias power supply, the negative input end of the first operational amplifier is connected to the second end of the first zener diode, the positive input end of the second operational amplifier is grounded, and the negative input end of the second operational amplifier is connected to the second end of the first zener diode. The invention ensures that the electronic equipment has the functions of surge protection and counting the number of times of surge in environmental operation, and provides necessary reference for the operation and maintenance of the electronic equipment.
Description
Technical Field
The invention relates to a surge counter, in particular to a surge counter capable of rapidly discharging surge.
Background
The surge (electrical surge), as the name implies, is a transient spike that exceeds a steady value and includes a surge voltage and a surge current. Surges are also called surges, and as the name suggests, are transient overvoltages that exceed normal operating voltages. In essence, a surge is a sharp pulse that occurs in only a few millionths of a second. In order to avoid damage to electrical components caused by surges, surge protectors are often required in some electronic devices.
However, the causes of the surge are various, and the different causes and the characteristics of the surge formed under the environment are different, so that in order to protect the circuit from the surge better, the occurrence of the surge needs to be monitored, and an appropriate surge protector can be selected to perform the surge protection on the circuit.
Disclosure of Invention
The invention aims to overcome the defect that the surge occurrence condition cannot be accurately counted in the prior art, and provides a surge counter with a surge protection function.
The invention solves the technical problems through the following technical scheme:
a surge counter is characterized by comprising a bidirectional thyristor device, a first Zener diode, a second Zener diode, a first operational amplifier and a second operational amplifier, wherein,
a first end of the first zener diode is connected to an anode of a power supply, a second end of the first zener diode is grounded through a second zener diode, a gate of the bidirectional thyristor is connected to a second end of the first zener diode, a first main electrode of the bidirectional thyristor is connected to the anode of the power supply, and a second main electrode of the bidirectional thyristor is grounded,
the positive input end of the first operational amplifier is connected with a positive bias power supply, the positive input end of the second operational amplifier is connected with a negative bias power supply, the positive input end of the first operational amplifier is connected with the positive bias power supply, the negative input end of the first operational amplifier is connected with the second end of the first Zener diode, and the negative input end of the second operational amplifier is connected with the second end of the first Zener diode.
Preferably, the surge counter further comprises a third zener diode and a fourth zener diode for protecting the operational amplifier at the rear end, wherein the third zener diode is connected between the negative input end of the first operational amplifier and the ground, and the fourth zener diode is connected between the negative input end of the second operational amplifier and the ground.
Preferably, the surge counter further comprises a first diode and a second diode for isolating the positive and negative surge detection generation voltage path, the anode of the first diode is connected to the second end of the first zener diode, and the cathode of the first diode is connected to the negative input end of the first operational amplifier; the anode of the second diode is connected to the negative input end of the second operational amplifier, and the cathode of the second diode is connected to the second end of the first zener diode.
Preferably, the surge counter further includes a third diode and a fourth diode for providing a stable voltage for the reference potential of the operational amplifier, an anode of the third diode is connected to the positive input terminal of the first operational amplifier, and a cathode of the third diode is grounded; the anode of the fourth diode is grounded, and the cathode of the fourth diode is connected with the positive input end or the negative bias power supply of the second operational amplifier.
Preferably, the surge counter further comprises a first resistor and a second resistor connected in series, and the second end of the first zener diode is connected to the second zener diode through the first resistor and the second resistor connected in series. Preferably, the surge counter further comprises a third resistor connected between the second terminal of the first zener diode and the negative input terminal of the first operational amplifier and a fourth resistor connected between the second terminal of the first zener diode and the negative input terminal of the second operational amplifier.
Preferably, the surge counter further includes a fifth resistor connected between the positive input terminal of the first operational amplifier and a positive bias power supply, and a sixth resistor connected between the positive input terminal of the second operational amplifier and a negative bias power supply. Preferably, the first zener diode and the second zener diode are both bidirectional zener diodes.
Preferably, the surge counter further comprises a seventh resistor connected between the negative input terminal of the first operational amplifier and ground and an eighth resistor connected between the negative input terminal of the second operational amplifier and a negative bias power supply.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: the electronic equipment has the surge protection function and the function of counting the number of times of surge occurrence in the complex environment operation, and provides necessary reference for the operation and maintenance of the electronic equipment. By accurately counting the surge generation frequency, quantitative analysis data can be provided for subsequent product design, and the reliability of the product is improved at the highest cost performance.
Drawings
Fig. 1 is a schematic circuit diagram of an inrush counter according to an embodiment of the present invention.
Description of the reference numerals
T1 bidirectional thyristor device
D1, D11 first Zener diode and second Zener diode
D2, D4 third Zener diode and fourth Zener diode
D6, D7 first diode, second diode
D3, D5 third diode and fourth diode
R1, R2 first resistor, second resistor
R3, R6 third resistor and fourth resistor
R4, R5 fifth resistor and sixth resistor
The seventh resistor and the eighth resistor of R7 and R8
U1, U2 first operational amplifier, second operational amplifier
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto.
Referring to fig. 1, the surge counter according to the present invention includes a triac device T1, a first zener diode D1, a second zener diode D11, a first operational amplifier U1, and a second operational amplifier U2, wherein the first zener diode D1 and the second zener diode D11 are both bidirectional zener diodes, a clamping voltage 15V and a maximum power consumption 1W are provided, a zener conduction current is controlled within 40mA, and a protection starting voltage is between 20V and 22V.
Specifically, a first terminal of the first zener diode D1 is connected to an anode (12V) of a power supply DC, a second terminal of the first zener diode is grounded through a second zener diode D11, a gate T1 of the triac device is connected to the second terminal of the first zener diode, a first main electrode of the triac device is connected to the anode of the power supply, and a second main electrode of the triac device is grounded. In this embodiment, taking the device DC12V as an input power surge protection circuit as an example, a 15V clamp voltage of a bidirectional zener diode D1 is applied to a 12V power input to ground, and when a surge occurs, the zener diode is first zener-breakdown to conduct. The bidirectional silicon controlled rectifier device adopts gate control, the voltage reaches about 5V and can trigger the device to conduct, when surge occurs, the bidirectional silicon controlled rectifier device can quickly respond after the first Zener diode is broken down, surge energy is discharged to the ground, and surge protection of equipment is realized. The first zener diode D1 and the second zener diode D11 cooperate to ensure that the back-end op-amp samples the appropriate varying levels in the event of a surge.
The positive input end of the first operational amplifier U1 is connected to a positive bias power supply (+ 3.3V-0V), the positive input end of the second operational amplifier U2 is connected to a negative bias power supply (0V-3.3V), the positive input end of the first operational amplifier U1 is connected to the positive bias power supply, the negative input end of the first operational amplifier U1 is connected to the second end of the first zener diode D1, the positive input end of the second operational amplifier U2 is grounded, and the negative input end of the second operational amplifier U2 is connected to the second end of the first zener diode D1. The first operational amplifier U1 is used to output positive surge (+ surge occurrence event) level transitions and the second operational amplifier U2 is used to output negative surge (-surge occurrence event) level transitions.
The surge counter further comprises a third zener diode D2 and a fourth zener diode D4, wherein the third zener diode D2 is connected between the negative input terminal of the first operational amplifier U1 and the ground, and the fourth zener diode D4 is connected between the negative input terminal of the second operational amplifier U2 and the ground. The clamping voltage of the third Zener diode and the fourth Zener diode is 3.3V, the maximum power consumption is 0.2W, and the third Zener diode and the fourth Zener diode are used for protecting the operational amplifier at the rear end.
The surge counter further comprises a first diode D6 and a second diode D7, wherein the anode of the first diode D6 is connected to the second end of the first zener diode D1, and the cathode of the first diode D6 is connected to the negative input end of the first operational amplifier U1; the anode of the second diode D7 is connected to the negative input terminal of the second operational amplifier U2, and the cathode of the second diode D7 is connected to the second terminal of the first zener diode D1. The +/-surge detection generation voltage path is isolated using the reverse blocking function of the first diode D6 and the second diode D7.
The surge counter further comprises a third diode D3 and a fourth diode D5, the anode of the third diode D3 is connected to the positive input of the first operational amplifier U1, and the cathode of the third diode D3 is grounded; the anode of the fourth diode D5 is grounded, the cathode is connected to the positive input terminal of the second operational amplifier U2 or the negative bias power supply, and the cathode of the fourth diode D5 is connected to the negative bias power supply (-3.3V). The forward conduction function of the third diode D3 and the fourth diode D5 are utilized to provide a stable +/-0.7V voltage for the operational amplifier reference potential.
The invention utilizes the voltage comparison function of the integrated operational amplifier, the output level can jump when the surge occurs, and the counting function of the surge occurrence can be realized by recording the occurrence frequency of the level jump.
Specifically, the operational amplifier is designed by adopting reversed phase voltage comparison, the +/-surge voltage detection circuit is symmetrically designed by adopting two paths of operational amplifier devices, the voltage for sampling the surge generation is divided into +/-surge detection voltage by using the reverse cut-off characteristic of a diode, the reference potentials of the two paths of operational amplifiers are +0.7V and-0.7V, and the bias power supplies of the operational amplifiers are + 3.3V-0V and 0V-3.3V respectively.
1) The operational amplifier output of the normal state and surge detection circuit part is constantly at + high level (+3.3V), when + surge occurs, the level change occurs at the-end, and when the + surge reaches 0.7V, the operational amplifier output level jumps from +3.3V to 0 level.
2) The operational amplifier output of the normal state-surge detection circuit part is constantly high level (-3.3V), when surge occurs, the level change occurs at the-end, and when the-surge occurs, the operational amplifier output level jumps from-3.3V to 0V when the-0.7V is reached.
The surge counter further comprises a first resistor R1 and a second resistor R2 which are connected in series, and the second end of the first Zener diode D1 is grounded through the first resistor R1, the second resistor R2 and a second Zener diode D11. In this embodiment, the first resistor and the second resistor are current-limiting voltage-dividing resistors, wherein the resistance of R1 is 150ohm, and the resistance of R2 is also 150 ohm.
The surge counter further includes a third resistor R3 connected between the second terminal of the first zener diode D1 and the negative input terminal of the first operational amplifier U1 and a fourth resistor R6 connected between the second terminal of the first zener diode D1 and the negative input terminal of the second operational amplifier U2. In this embodiment, the third resistor R3 and the fourth resistor R6 are current limiting resistors, and have a resistance of 1 Kohm.
The surge counter further includes a fifth resistor R4 connected between the positive input of the first operational amplifier U1 and a positive bias supply and a sixth resistor R5 connected between the positive input of the second operational amplifier U2 and a negative bias supply. In the present embodiment, the fifth resistor R4 and the sixth resistor R5 are both current limiting resistors, and have resistance values of 4.7 kohm.
In addition, the surge counter further comprises a seventh resistor R7 connected between the negative input terminal of the first operational amplifier and ground and an eighth resistor R8 connected between the negative input terminal of the second operational amplifier and a negative bias power supply, both of which are pull-down resistors, wherein R7(10K ohm) is connected to ground, and the negative terminal of the pull-down operational amplifier is connected to ground; r8(10K ohm) to-3.3V, and the negative terminal potential of the pull-down operational amplifier is pulled to-3.3V.
Although current electronic equipment all require a lightning surge protection function that meets certain standards, certain protection of the equipment is provided only when a surge occurs. However, the actual operation environment of the equipment is complex, the occurrence of lightning surge is mostly related to the actual environments such as seasons, weather and the like, and in the operation process of the equipment, when the surge frequently occurs, the equipment can be damaged with a certain probability. By adopting the surge counter of the invention and setting the counting threshold value, the alarm can be taken, the failure early warning can be provided, and the effective protection can be provided for the equipment.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. A surge counter comprising a triac, a first Zener diode, a second Zener diode, a first operational amplifier and a second operational amplifier, wherein,
a first end of the first zener diode is connected to an anode of a power supply, a second end of the first zener diode is grounded through a second zener diode, a gate of the bidirectional thyristor is connected to a second end of the first zener diode, a first main electrode of the bidirectional thyristor is connected to the anode of the power supply, and a second main electrode of the bidirectional thyristor is grounded,
the positive input end of the first operational amplifier is connected with a positive bias power supply, the positive input end of the second operational amplifier is connected with a negative bias power supply, the negative input end of the first operational amplifier is connected with the second end of the first Zener diode, the positive input end of the second operational amplifier is grounded, and the negative input end of the second operational amplifier is connected with the second end of the first Zener diode.
2. The surge counter of claim 1, wherein the surge counter further comprises a third zener diode connected between the negative input of the first operational amplifier and ground, and a fourth zener diode connected between the negative input of the second operational amplifier and ground.
3. The surge counter of claim 1, wherein the surge counter further comprises a first diode and a second diode, the anode of the first diode being connected to the second end of the first zener diode, the cathode of the first diode being connected to the negative input terminal of the first operational amplifier; the anode of the second diode is connected to the negative input end of the second operational amplifier, and the cathode of the second diode is connected to the second end of the first zener diode.
4. The surge counter of claim 1, further comprising a third diode and a fourth diode, an anode of the third diode being connected to the positive input of the first operational amplifier, a cathode of the third diode being connected to ground; the anode of the fourth diode is grounded, and the cathode of the fourth diode is connected with the positive input end of the second operational amplifier and the negative bias power supply.
5. The surge counter of any of claims 1 to 4, further comprising a first resistor and a second resistor in series, a second end of the first zener diode connected to the second zener diode through the first resistor and the second resistor in series.
6. The surge counter of any of claims 1-4, further comprising a third resistor connected between the second terminal of the first zener diode and the negative input of the first operational amplifier and a fourth resistor connected between the second terminal of the first zener diode and the negative input of the second operational amplifier.
7. The up-counter of any of claims 1-4, further comprising a fifth resistor connected between the positive input of the first operational amplifier and a positive bias supply and a sixth resistor connected between the positive input of the second operational amplifier and a negative bias supply.
8. The surge counter of any of claims 1-4, wherein the first zener diode and the second zener diode are both bidirectional zener diodes.
9. The surge counter of any of claims 1-4, further comprising a seventh resistor connected between the negative input of the first operational amplifier and ground and an eighth resistor connected between the negative input of the second operational amplifier and a negative bias supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010043284.8A CN111190046B (en) | 2020-01-15 | 2020-01-15 | Surge counter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010043284.8A CN111190046B (en) | 2020-01-15 | 2020-01-15 | Surge counter |
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| Publication Number | Publication Date |
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| CN111190046A CN111190046A (en) | 2020-05-22 |
| CN111190046B true CN111190046B (en) | 2022-06-24 |
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| CN202010043284.8A Active CN111190046B (en) | 2020-01-15 | 2020-01-15 | Surge counter |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100957833B1 (en) * | 2009-06-23 | 2010-05-14 | 주식회사 그라운드 | Surge protector |
| CN202110211U (en) * | 2011-04-30 | 2012-01-11 | 广州易仕科技有限公司 | Surge counter |
| CN206195457U (en) * | 2016-08-31 | 2017-05-24 | 重庆宇通系统软件有限公司 | Dual supply warning automatic switch -over surge protection module |
| CN108683167B (en) * | 2018-07-03 | 2024-04-09 | 苏州锴威特半导体股份有限公司 | Anti-surge circuit of PD equipment |
| CN209198627U (en) * | 2018-11-22 | 2019-08-02 | 华蓥中科新能源有限公司 | A kind of battery voltage detector |
| CN209313429U (en) * | 2019-01-11 | 2019-08-27 | 深圳市矽塔科技有限公司 | A kind of the TVS protection circuit and electronic equipment of Anti-surging |
| CN110021923B (en) * | 2019-04-16 | 2021-05-11 | 上海艾为电子技术股份有限公司 | Surge protection circuit and electronic equipment |
| CN209608339U (en) * | 2019-05-10 | 2019-11-08 | 四川交通职业技术学院 | A kind of active direct current Inrush current restraining device |
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| CN111190046A (en) | 2020-05-22 |
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