CN212112263U - Linear voltage stabilizing circuit with overvoltage protection - Google Patents
Linear voltage stabilizing circuit with overvoltage protection Download PDFInfo
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- CN212112263U CN212112263U CN202020247798.0U CN202020247798U CN212112263U CN 212112263 U CN212112263 U CN 212112263U CN 202020247798 U CN202020247798 U CN 202020247798U CN 212112263 U CN212112263 U CN 212112263U
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- voltage stabilizing
- overvoltage protection
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Abstract
The utility model provides a take overvoltage protection's linear voltage stabilizing circuit, include: the output end of the DC/DC conversion power supply is connected with the input end of the fuse, the input end of the first biasing circuit, the input end of the second biasing circuit and the enabling end of the voltage stabilizing chip are connected with the output end of the fuse, the control end of the voltage stabilizing chip and the drain electrode of the field effect tube are connected with the output end of the second biasing circuit, and the output end of the first biasing circuit is connected with the grid electrode of the field effect tube. The utility model provides a take overvoltage protection's linear voltage stabilizing circuit, solution that this circuit can be fine is because there is not excessive pressure turn-off function, and under the unusually highly compressed condition, leads to the condition that the steady voltage chip is burnt out by generating heat.
Description
Technical Field
The utility model relates to a power conversion field, in particular to take overvoltage protection's linear voltage stabilizing circuit.
Background
At present, a voltage stabilizing circuit in the market often transfers 24V direct current provided by a switching power supply to a DC/DC conversion power supply, obtains a working power supply through conversion of the DC/DC conversion power supply, and then transfers the working power supply to a voltage stabilizing chip.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a take overvoltage protection's linear voltage stabilizing circuit can have solved effectively because do not have the excessive pressure turn-off function, and under the unusually highly compressed condition, lead to the condition that the steady voltage chip is burnt out by generating heat.
According to the utility model discloses a take overvoltage protection's linear voltage stabilizing circuit, include: the output end of the DC/DC conversion power supply is connected with the input end of the fuse, the input end of the first biasing circuit, the input end of the second biasing circuit and the enabling end of the voltage stabilizing chip are all connected with the output end of the fuse, the control end of the voltage stabilizing chip and the drain electrode of the field effect transistor are all connected with the output end of the second biasing circuit, and the output end of the first biasing circuit is connected with the grid electrode of the field effect transistor.
According to the utility model discloses a take overvoltage protection's linear voltage stabilizing circuit, the utility model discloses following beneficial effect has at least: the combination of the fuse, the first bias circuit, the second bias circuit and the field effect transistor has the function of overvoltage protection, the fuse has the function of protecting the circuit when the DC/DC converter outputs over-high voltage, the combination of the first bias circuit, the second bias circuit and the field effect transistor can enable the circuit to have the characteristics of high withstand voltage value, small voltage value error, quick response and the like, and the circuit can have high performance.
According to some embodiments of the invention, the first bias circuit comprises: the voltage stabilizing diode comprises a voltage stabilizing diode, a first resistor and a second resistor, wherein one end of the voltage stabilizing diode is an input end of the first biasing circuit, the other end of the voltage stabilizing diode is connected with one end of the first resistor, the other end of the first resistor is an output end of the first biasing circuit, one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
According to some embodiments of the invention, the zener diode is of the type ISMA5922BT 3G.
According to some embodiments of the invention, the second bias circuit comprises a third resistor, one end of the third resistor is the input end of the second bias circuit, and the other end of the third resistor is the output end of the second bias circuit.
According to some embodiments of the invention, the model of the field effect transistor is 2N 7002.
According to some embodiments of the invention, the model of the voltage stabilization chip is XC 6702.
According to the utility model discloses a some embodiments, the output of steady voltage chip and user circuit all are connected with the one end of fourth resistance, the other end of fourth resistance is connected with the diode, the other end ground connection of diode.
According to some embodiments of the invention, the diode is of type 0805 URC.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic block diagram of a linear voltage stabilizing circuit with overvoltage protection according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a linear voltage stabilizing circuit with overvoltage protection according to an embodiment of the present invention.
Reference numerals:
fuse FU1, zener diode D1, diode D2, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, field effect transistor QC1, voltage stabilizing chip U1, DC/DC conversion power supply 100, first bias circuit 200, second bias circuit 300 and user circuit 400.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by referring to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Referring to fig. 1, according to the utility model discloses a take overvoltage protection's linear voltage stabilizing circuit, include:
the output end of the DC/DC conversion power supply 100 is connected with the input end of a fuse FU1, the input end of the first bias circuit 200, the input end of the second bias circuit 300 and the enable end of the voltage stabilizing chip U1 are all connected with the output end of the fuse FU1, the control end of the voltage stabilizing chip U1 and the drain electrode of the field effect transistor QC1 are all connected with the output end of the second bias circuit 300, and the output end of the first bias circuit 200 is connected with the gate electrode of the field effect transistor QC 1.
In this embodiment, the fuse FU1, the first bias circuit 200, the second bias circuit 300, and the field-effect transistor QC1 are connected to each other to realize an overvoltage shutdown function, the fuse FU1 has an effect of protecting the circuit when the DC/DC converter 100 outputs an excessive voltage, and the combination of the first bias circuit 200, the second bias circuit 300, and the field-effect transistor QC1 can make the circuit have characteristics of a higher withstand voltage value, a small voltage value error, a fast response, and the like, so that the circuit can have a higher performance.
Referring to fig. 2, according to the present invention, a linear voltage stabilizing circuit with overvoltage protection, the first bias circuit 200 includes: the voltage stabilizing diode D1, the first resistance R1 and the first resistance R2, one end of the voltage stabilizing diode D1 is the input end of the first bias circuit 200, the other end of the voltage stabilizing diode D1 is connected with one end of the first resistance R1, the other end of the first resistance R1 is the output end of the first bias circuit 200, one end of the first resistance R2 is connected with the other end of the first resistance R1, and the other end of the first resistance R2 is grounded.
In this embodiment, when the input voltage exceeds the rated voltage of the zener diode D1, the zener diode D1 is turned on in reverse direction, the voltage supplies a bias voltage to the fet QC1 through the first resistor R1 and the first resistor R2, the fet QC1 is turned on when the bias voltage is 1.5V, and the zener diode D1 is turned off and the fet QC1 is turned off when the input voltage is lower than the set protection voltage.
Further, the zener diode D1 is model ISMA5922BT 3G.
In this embodiment, the dynamic resistance of the zener diode of this type is small, so the zener effect is good.
Further, the second bias circuit 300 includes a third resistor R3, one end of the third resistor R3 is an input end of the second bias circuit 300, and the other end of the third resistor R3 is an output end of the second bias circuit 300.
In this embodiment, the input voltage passes through the second bias circuit 300, and the enable terminal of the voltage regulator chip is set at a high level, so that the voltage regulator chip can normally operate and output a voltage of 3.3V.
Further, the model of the field effect transistor QC1 is 2N 7002.
In this embodiment, when the fet QC1 is turned off, the enable pin of the regulator chip U1 is at a high level, the regulator chip U1 operates normally, and when the fet QC1 is turned on, the enable pin of the regulator chip U1 is at a low level, and the regulator chip U1 stops operating.
Further, the model of the voltage stabilizing chip U1 is XC 6702.
In this embodiment, the voltage regulator chip of this type has functions such as current limiting, overheat shutdown and soft start, and can protect the voltage regulator chip U1 from being burnt out due to input of abnormal voltage.
Further, the output terminal of the regulator chip U1 and the user circuit 400 are connected to one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected to the diode D2, and the other end of the diode D2 is grounded.
In this embodiment, the combination of the fourth resistor R4 and the diode D2 can prevent the output voltage from varying due to load variation, and maintain a stable output voltage.
Further, the diode D2 has a model number of 0805 URC.
In the description of the present invention, unless explicitly defined otherwise, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (7)
1. A linear voltage regulator circuit with overvoltage protection, comprising:
the output end of the DC/DC conversion power supply is connected with the input end of the fuse, the input end of the first biasing circuit, the input end of the second biasing circuit and the enabling end of the voltage stabilizing chip are all connected with the output end of the fuse, the control end of the voltage stabilizing chip and the drain electrode of the field effect transistor are all connected with the output end of the second biasing circuit, and the output end of the first biasing circuit is connected with the grid electrode of the field effect transistor.
2. The linear voltage regulator circuit with over-voltage protection of claim 1, wherein the first bias circuit comprises: the voltage stabilizing diode comprises a voltage stabilizing diode, a first resistor and a second resistor, wherein one end of the voltage stabilizing diode is an input end of the first biasing circuit, the other end of the voltage stabilizing diode is connected with one end of the first resistor, the other end of the first resistor is an output end of the first biasing circuit, one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
3. The linear voltage regulator circuit with overvoltage protection as claimed in claim 2, wherein said zener diode is model number ISMA5922BT 3G.
4. The linear voltage regulator circuit with overvoltage protection as claimed in claim 1, wherein said second bias circuit includes a third resistor, one end of said third resistor is an input end of said second bias circuit, and the other end of said third resistor is an output end of said second bias circuit.
5. The linear voltage regulator circuit with overvoltage protection as claimed in claim 1, wherein said fet is of type 2N7002 and said regulator chip is of type XC 6702.
6. The linear voltage regulator circuit with overvoltage protection as claimed in claim 1, wherein the output terminal of the regulator chip and the user circuit are both connected to one end of a fourth resistor, the other end of the fourth resistor is connected to one end of a diode, and the other end of the diode is grounded.
7. The linear voltage regulator circuit with overvoltage protection as claimed in claim 6, wherein said diode is type 0805 URC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020247798.0U CN212112263U (en) | 2020-03-03 | 2020-03-03 | Linear voltage stabilizing circuit with overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020247798.0U CN212112263U (en) | 2020-03-03 | 2020-03-03 | Linear voltage stabilizing circuit with overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212112263U true CN212112263U (en) | 2020-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020247798.0U Active CN212112263U (en) | 2020-03-03 | 2020-03-03 | Linear voltage stabilizing circuit with overvoltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212112263U (en) |
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2020
- 2020-03-03 CN CN202020247798.0U patent/CN212112263U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A linear voltage regulator circuit with overvoltage protection Effective date of registration: 20220810 Granted publication date: 20201208 Pledgee: Guangdong Shunde Rural Commercial Bank Co.,Ltd. science and technology innovation sub branch Pledgor: GONSIN CONFERENCE EQUIPMENT CO.,LTD. Registration number: Y2022980012291 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |