CN204392189U - Operational amplifier is powered overvoltage crowbar - Google Patents
Operational amplifier is powered overvoltage crowbar Download PDFInfo
- Publication number
- CN204392189U CN204392189U CN201520009530.2U CN201520009530U CN204392189U CN 204392189 U CN204392189 U CN 204392189U CN 201520009530 U CN201520009530 U CN 201520009530U CN 204392189 U CN204392189 U CN 204392189U
- Authority
- CN
- China
- Prior art keywords
- voltage stabilizing
- stabilizing didoe
- effect transistor
- field effect
- electric capacity
- 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 discloses a kind of operational amplifier to power overvoltage crowbar, comprise the first electric capacity, second electric capacity, 3rd electric capacity, first voltage stabilizing didoe, second voltage stabilizing didoe, first field effect transistor, second field effect transistor, potentiometer, power supply, resistance and amplifier, the utility model operational amplifier is powered after overvoltage crowbar use, when supply voltage increases suddenly, first voltage stabilizing didoe and the second voltage stabilizing didoe work, make operational amplifier operating voltage lower than the voltage stabilizing value of the first voltage stabilizing didoe and the second voltage stabilizing didoe, first field effect transistor and the second field effect transistor present high impedance, thus limit the electric current that the first voltage stabilizing didoe and the second voltage stabilizing didoe flow through, the actual power voltage that use the utility model works as operational amplifier is higher, or during power supply generation sudden change, it is protected not damage.
Description
Technical field
The utility model relates to a kind of operational amplifier protective circuit, particularly relates to a kind of operational amplifier and to power overvoltage crowbar.
Background technology
Operational amplifier is the circuit unit with very high-amplification-factor, in side circuit, usually certain functional module is jointly formed in conjunction with feedback network, owing to being applied in simulation computer in early days, in order to realize mathematical operation, therefore gain the name " operational amplifier ", operational amplifier is the circuit unit that an angle from function is named, can be realized by discrete device, also can be implemented in the middle of semiconductor chip, along with the development of semiconductor technology, most amplifier exists with the form of single-chip, amplifier of a great variety, be widely used in the middle of electron trade, its Computer is as a highly integrated electronic product, operational amplifier quantity is wherein especially many, but the power supply circuits of present most of operational amplifier all adopt direct power supply, it is not protected, may because the unexpected change of voltage makes operational amplifier damage, computer is caused normally not run.
Utility model content
The purpose of this utility model is just to provide to solve the problem a kind of operational amplifier to power overvoltage crowbar.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of operational amplifier is powered overvoltage crowbar, comprises the first electric capacity, second electric capacity, 3rd electric capacity, first voltage stabilizing didoe, second voltage stabilizing didoe, first field effect transistor, second field effect transistor, potentiometer, power supply, resistance and amplifier, the positive pole of described power supply is connected with the source electrode of described first field effect transistor and the grid of described first field effect transistor respectively, the negative pole of described first voltage stabilizing didoe of drain electrode difference of described first field effect transistor, the first end of described first electric capacity is connected with the cathode voltage input of described amplifier, the positive pole of described first voltage stabilizing didoe respectively with the second end of described first electric capacity, the first end of described potentiometer is connected with the sliding end of described potentiometer, the negative pole of described power supply is connected with the source electrode of described second field effect transistor and the grid of described second field effect transistor respectively, the drain electrode of described second field effect transistor respectively with the negative pole of described second voltage stabilizing didoe, the first end of described second electric capacity is connected with the cathode voltage input of described amplifier, the positive pole of described second voltage stabilizing didoe respectively with the second end of described second electric capacity, the first end of described resistance is connected with the first end of described 3rd electric capacity and ground connection, and the second end of described resistance is connected with the second end of described potentiometer and the second end of described 3rd electric capacity respectively.
The beneficial effects of the utility model are:
The utility model operational amplifier is powered after overvoltage crowbar use; when supply voltage increases suddenly; first voltage stabilizing didoe and the second voltage stabilizing didoe work; make operational amplifier operating voltage lower than the voltage stabilizing value of the first voltage stabilizing didoe and the second voltage stabilizing didoe; first field effect transistor and the second field effect transistor present high impedance; thus limit the electric current that the first voltage stabilizing didoe and the second voltage stabilizing didoe flow through; use the utility model when the actual power voltage of operational amplifier is higher or power supply produce suddenly change time, protect it not damage.
Accompanying drawing explanation
Fig. 1 is that the utility model operational amplifier is powered the circuit diagram of overvoltage crowbar.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the utility model operational amplifier is powered overvoltage crowbar, comprises the first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, first voltage stabilizing didoe ZD1, second voltage stabilizing didoe ZD2, first field effect transistor T1, second field effect transistor T2, potentiometer RP, power supply E, the positive pole of resistance R and amplifier U, power supply E is connected with the source electrode of the first field effect transistor T1 and the grid of the first field effect transistor T1 respectively, the negative pole of the drain electrode difference first voltage stabilizing didoe ZD1 of the first field effect transistor T1, the first end of the first electric capacity C1 is connected with the cathode voltage input of amplifier U, the positive pole of the first voltage stabilizing didoe ZD1 respectively with second end of the first electric capacity C1, the first end of potentiometer RP is connected with the sliding end of potentiometer RP, and the negative pole of power supply E is connected with the source electrode of the second field effect transistor T2 and the grid of the second field effect transistor T2 respectively, the drain electrode of the second field effect transistor T2 respectively with the negative pole of the second voltage stabilizing didoe ZD2, the first end of the second electric capacity C2 is connected with the cathode voltage input of amplifier U, the positive pole of the second voltage stabilizing didoe ZD2 respectively with second end of the second electric capacity C2, the first end of resistance R is connected with the first end of the 3rd electric capacity C3 and ground connection, and second end of resistance R is connected with second end of potentiometer RP and second end of the 3rd electric capacity C3 respectively.
The power operation principle of overvoltage crowbar of the utility model operational amplifier is as follows:
After protective circuit uses, when power supply E voltage power supply is normal, first voltage stabilizing didoe ZD1 and the second voltage stabilizing didoe ZD2 does not work, first field effect transistor T1 and the second field effect transistor T2 pipe present Low ESR, do not affect operational amplifier U normally to work, when power supply E voltage increases suddenly, first voltage stabilizing didoe ZD1 and the second voltage stabilizing didoe ZD2 works, make operational amplifier U operating voltage can not more than the voltage stabilizing value of the first voltage stabilizing didoe ZD1 and the second voltage stabilizing didoe ZD2, first field effect transistor T1 and the second field effect transistor T2 presents high impedance, thus limit the electric current that the first voltage stabilizing didoe ZD1 and the second voltage stabilizing didoe ZD2 flows through, it is made also to be unlikely to burn out, when the actual power voltage of operational amplifier U is higher, or during power supply E generation sudden change, it is protected not damage.
Claims (1)
1. operational amplifier is powered an overvoltage crowbar, it is characterized in that: comprise the first electric capacity, second electric capacity, 3rd electric capacity, first voltage stabilizing didoe, second voltage stabilizing didoe, first field effect transistor, second field effect transistor, potentiometer, power supply, resistance and amplifier, the positive pole of described power supply is connected with the source electrode of described first field effect transistor and the grid of described first field effect transistor respectively, the negative pole of described first voltage stabilizing didoe of drain electrode difference of described first field effect transistor, the first end of described first electric capacity is connected with the cathode voltage input of described amplifier, the positive pole of described first voltage stabilizing didoe respectively with the second end of described first electric capacity, the first end of described potentiometer is connected with the sliding end of described potentiometer, the negative pole of described power supply is connected with the source electrode of described second field effect transistor and the grid of described second field effect transistor respectively, the drain electrode of described second field effect transistor respectively with the negative pole of described second voltage stabilizing didoe, the first end of described second electric capacity is connected with the cathode voltage input of described amplifier, the positive pole of described second voltage stabilizing didoe respectively with the second end of described second electric capacity, the first end of described resistance is connected with the first end of described 3rd electric capacity and ground connection, and the second end of described resistance is connected with the second end of described potentiometer and the second end of described 3rd electric capacity respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520009530.2U CN204392189U (en) | 2015-01-08 | 2015-01-08 | Operational amplifier is powered overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520009530.2U CN204392189U (en) | 2015-01-08 | 2015-01-08 | Operational amplifier is powered overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204392189U true CN204392189U (en) | 2015-06-10 |
Family
ID=53364869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520009530.2U Expired - Fee Related CN204392189U (en) | 2015-01-08 | 2015-01-08 | Operational amplifier is powered overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204392189U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098702A (en) * | 2015-08-27 | 2015-11-25 | 国家电网公司 | Overvoltage protector |
| CN113055781A (en) * | 2019-12-26 | 2021-06-29 | 上海博泰悦臻电子设备制造有限公司 | Audio signal conversion circuit and related product |
-
2015
- 2015-01-08 CN CN201520009530.2U patent/CN204392189U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098702A (en) * | 2015-08-27 | 2015-11-25 | 国家电网公司 | Overvoltage protector |
| CN113055781A (en) * | 2019-12-26 | 2021-06-29 | 上海博泰悦臻电子设备制造有限公司 | Audio signal conversion circuit and related product |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20150610 Termination date: 20160108 |