CN115498611A - Overvoltage protection circuit based on Darlington tube - Google Patents
Overvoltage protection circuit based on Darlington tube Download PDFInfo
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- CN115498611A CN115498611A CN202210927125.3A CN202210927125A CN115498611A CN 115498611 A CN115498611 A CN 115498611A CN 202210927125 A CN202210927125 A CN 202210927125A CN 115498611 A CN115498611 A CN 115498611A
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- darlington
- overvoltage protection
- protection circuit
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- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 7
- 230000015556 catabolic process Effects 0.000 claims description 5
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
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Abstract
The invention discloses an overvoltage protection circuit based on a Darlington tube, which is simple in circuit, small in occupied board size, low in cost and strong in flexibility, and all components are the most common and simple components. The circuit comprises a Darlington tube Q1, a voltage stabilizing tube D1, a first resistor R1, a second resistor R2, a capacitor C1 and a Schottky diode D2. The input end of the overvoltage protection circuit is connected to the collector electrode of the Darlington tube Q1. The base of the Darlington tube Q1 is connected to the anode of the voltage stabilizing tube D1. The first resistor R1 and the second resistor R2 are connected to the base electrode of the Darlington transistor Q1 after voltage division, and are used for dividing voltage to provide voltage for the base electrode of the Darlington transistor Q1, so that the Darlington transistor works in an amplification area all the time; the capacitor C1 is connected in parallel to two ends of the voltage stabilizing tube D1. The positive pole of the Schottky diode D2 is connected with the emitting pole of the Darlington tube Q1 and is used as the output end VOUT of the overvoltage protection circuit, and the negative pole of the Schottky diode D2 is connected with the base pole of the Darlington tube Q1.
Description
Technical Field
The invention relates to the technical field of overvoltage protection, in particular to an overvoltage protection circuit based on a Darlington tube.
Background
The overvoltage protection circuit in the current market is usually based on a chip or based on a triode or based on reference source control or based on overvoltage protection realized by electronic components such as a voltage comparator and the like, and has the defects of complex design, more peripheral devices, large occupied space, higher device cost and the like.
Disclosure of Invention
In view of the above, the invention provides an overvoltage protection circuit based on a darlington tube, which has the advantages of simple circuit, small occupied board volume, low cost and strong design flexibility, all of the components are the most common and simple components, and can prevent high input voltage surge for a long time and well protect a rear-stage circuit.
In order to achieve the purpose, the technical scheme of the invention is as follows: an overvoltage protection circuit based on a Darlington tube comprises a Darlington tube Q1, a voltage stabilizing tube D1, a first resistor R1, a second resistor R2, a capacitor C1 and a Schottky diode D2.
The input end of the overvoltage protection circuit is connected to the collector electrode of the Darlington tube Q1.
The base of the Darlington tube Q1 is connected to the anode of the voltage stabilizing tube D1.
The first resistor R1 and the second resistor R2 are connected to the base electrode of the Darlington tube Q1 after voltage division, and are used for dividing voltage to provide voltage for the base electrode of the Darlington tube Q1, so that the Darlington tube always works in an amplification area;
the capacitor C1 is connected in parallel to two ends of the voltage stabilizing tube D1.
The positive pole of the Schottky diode D2 is connected with the emitting electrode of the Darlington transistor Q1 and is jointly used as the output end VOUT of the overvoltage protection circuit, and the negative pole of the Schottky diode D2 is connected with the base electrode of the Darlington transistor Q1.
Furthermore, when the voltage VIN at the input end is divided by the resistor R1 and the resistor R2, the voltage U at the two ends of the resistor R2 R2 When the breakdown voltage of the voltage-stabilizing tube D1 is larger than the breakdown voltage of the voltage-stabilizing tube D1, the voltage-stabilizing tube D1 clamps the voltage to the voltage at two ends of the voltage-stabilizing tube D1, the Darlington tube is in an amplification area at the moment, and the voltage of VOUT is equal to the clamping voltage U at two ends of the voltage-stabilizing tube D1 D1 And subtracting the voltage of 0.7V of the UBE of the Darlington tube to realize overvoltage protection.
Furthermore, the voltage VIN at the input end is divided by the resistor R1 and the resistor R2, and the voltage U at the two ends of R2 R2 When the voltage of the base electrode of the Darlington tube Q1 is not enough to break down the voltage-stabilizing tube D1, the voltage of the output VOUT is equal to the divided voltage U R2 The voltage between the base and emitter BE of the Darlington tube is subtracted by 0.7V.
Further, the protection circuit further comprises a fuse F1, and the input end of the overvoltage protection circuit is connected to the collector electrode of the Darlington tube Q1 through the fuse F1.
Further, the capacitor C1 is characterized to prevent the circuit from self-oscillation.
Further, the schottky diode D2 constitutes a voltage negative feedback circuit, and is characterized by maintaining an output voltage.
Has the advantages that:
1. the invention provides an overvoltage protection circuit based on a Darlington tube, which can realize overvoltage protection through the combination relation of 6 components, has simple circuit design and small occupied volume, and the components are composed of the most simple resistor, capacitor, voltage-stabilizing tube, darlington tube and diode basic components, and have low cost, thereby reducing the circuit cost.
2. The invention provides an overvoltage protection circuit based on a Darlington tube, which is simple in circuit, low in cost and wider in protection voltage range.
3. The overvoltage protection circuit based on the Darlington tube can prevent long-time surge of larger input voltage and effectively prevent the influence of overhigh voltage on a post-stage circuit.
4. The overvoltage protection circuit based on the Darlington tube has strong circuit flexibility, and the overvoltage protection circuit with different voltages can be realized by selecting different voltage-regulator tubes.
Drawings
Fig. 1 is a schematic diagram of an overvoltage protection circuit based on a darlington tube according to the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides an overvoltage protection circuit based on a Darlington tube, which is an overvoltage protection circuit consisting of a Darlington tube Q1, a voltage regulator tube D1, a resistor R2, a capacitor C1, a fuse F1 and a Schottky diode D2. The input end of the overvoltage protection circuit is connected to the collector electrode of the Darlington tube Q1 through a fuse F1 and is used as the input end of the overvoltage protection circuit; the base electrode of the Darlington tube Q1 is connected to the anode of the voltage-regulator tube D1, when the input voltage is larger (namely the voltage UR2 after the voltage division of the resistor R1 and the resistor R2 is larger than the breakdown voltage of the voltage-regulator tube D1), the voltage-regulator tube D1 clamps the voltage to the voltage at the two ends of the voltage-regulator tube D1, the Darlington tube is positioned in an amplification area at the moment, and the voltage VOUT is equal to the voltage UD1 at the two ends of the voltage-regulator tube D1 minus about 0.7V of the UBE of the Darlington tube, so that when the input voltage is larger, the output voltage is still kept at the voltage-stabilizing value minus 0.7V of the voltage-regulator tube D1, and the overvoltage protection effect is achieved; the resistor R1 and the resistor R2 are connected to the base electrode of the Darlington tube Q1 after voltage division, and the voltage division is used for providing voltage for the base electrode voltage of the Darlington tube Q1 to enable the Darlington tube Q1 to work in an amplification area all the time, when the divided voltage UR2 is not enough to break down the voltage stabilizing tube D1, the base electrode voltage of the Darlington tube Q1 is determined by the voltage dividing resistor, and the voltage of the output VOUT is about 0.7V when the voltage between the divided voltage UR2 and the Darlington tube BE is subtracted; the capacitor C1 is connected in parallel to two ends of the voltage regulator tube D1, and the capacitor C1 is characterized in that the circuit is prevented from generating self-oscillation; the positive pole of the Schottky diode D2 is connected with the emitting pole of the Darlington tube Q1 and is used as the output end of the overvoltage protection circuit together, and the Schottky diode D2 forms a voltage negative feedback circuit and is characterized in that the output voltage is maintained.
Wherein, 1, the Darlington tube can be replaced by a composite tube; 2. the voltage regulator tube can be replaced by a reference voltage source
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An overvoltage protection circuit based on a Darlington tube is characterized by comprising a Darlington tube Q1, a voltage regulator tube D1, a first resistor R1, a second resistor R2, a capacitor C1 and a Schottky diode D2;
the input end of the overvoltage protection circuit is connected to the collector electrode of the Darlington tube Q1;
the base electrode of the Darlington tube Q1 is connected to the anode of the voltage stabilizing tube D1;
the first resistor R1 and the second resistor R2 are connected to the base electrode of the Darlington tube Q1 after voltage division, and are used for dividing voltage to provide voltage for the base electrode of the Darlington tube Q1, so that the Darlington tube always works in an amplification area;
the capacitor C1 is connected to two ends of the voltage stabilizing tube D1 in parallel;
the positive pole of the Schottky diode D2 is connected with the emitting pole of the Darlington tube Q1 and is used as the output end VOUT of the overvoltage protection circuit, and the negative pole of the Schottky diode D2 is connected with the base pole of the Darlington tube Q1.
2. The darlington-based overvoltage protection circuit as claimed in claim 1, wherein when the input voltage VIN is divided by the resistor R1 and the resistor R2, the voltage U across the resistor R2 is R2 When the breakdown voltage of the voltage-stabilizing tube D1 is larger than the breakdown voltage of the voltage-stabilizing tube D1, the voltage-stabilizing tube D1 clamps the voltage to the voltage at two ends of the voltage-stabilizing tube D1, the Darlington tube is in an amplification area at the moment, and the voltage of VOUT is equal to the clamping voltage U at two ends of the voltage-stabilizing tube D1 D1 And subtracting the voltage of 0.7V of the UBE of the Darlington tube to realize overvoltage protection.
3. The darlington-based overvoltage protection circuit according to claim 1 or 2, characterized in that the voltage VIN at the input end is divided by a resistor R1 and a resistor R2, and the voltage U at two ends of R2 is R2 When the voltage of the base electrode of the Darlington tube Q1 is not enough to break down the voltage-stabilizing tube D1, the voltage of the output VOUT is equal to the divided voltage U R2 The voltage between the base and emitter BE of the Darlington tube is subtracted by 0.7V.
4. The darlington-based overvoltage protection circuit according to claim 1, wherein said overvoltage protection circuit further comprises a fuse F1, and an input terminal of said overvoltage protection circuit is connected to a collector of a darlington Q1 through the fuse F1.
5. The darlington-based overvoltage protection circuit according to any of claims 1 to 4, wherein said capacitor C1 is characterized to prevent self-oscillation of the circuit.
6. The darlington-based overvoltage protection circuit according to any one of claims 1 to 4, wherein the schottky diode D2 forms a voltage negative feedback circuit characterized by maintaining an output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210927125.3A CN115498611A (en) | 2022-08-03 | 2022-08-03 | Overvoltage protection circuit based on Darlington tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210927125.3A CN115498611A (en) | 2022-08-03 | 2022-08-03 | Overvoltage protection circuit based on Darlington tube |
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| Publication Number | Publication Date |
|---|---|
| CN115498611A true CN115498611A (en) | 2022-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210927125.3A Pending CN115498611A (en) | 2022-08-03 | 2022-08-03 | Overvoltage protection circuit based on Darlington tube |
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| Country | Link |
|---|---|
| CN (1) | CN115498611A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4037115A (en) * | 1976-06-25 | 1977-07-19 | Bell Telephone Laboratories, Incorporated | Bipolar switching transistor using a Schottky diode clamp |
| CN101119028A (en) * | 2007-06-28 | 2008-02-06 | 深圳市中兴移动通信有限公司 | Electrical source input overvoltage protection circuit |
| CN210430919U (en) * | 2019-08-27 | 2020-04-28 | 江西洪都航空工业集团有限责任公司 | Direct-current low-power wide-pulse surge suppression circuit |
| CN211454401U (en) * | 2020-01-21 | 2020-09-08 | 福建飞毛腿动力科技有限公司 | Low-cost DC linear voltage-stabilized power supply |
-
2022
- 2022-08-03 CN CN202210927125.3A patent/CN115498611A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4037115A (en) * | 1976-06-25 | 1977-07-19 | Bell Telephone Laboratories, Incorporated | Bipolar switching transistor using a Schottky diode clamp |
| CN101119028A (en) * | 2007-06-28 | 2008-02-06 | 深圳市中兴移动通信有限公司 | Electrical source input overvoltage protection circuit |
| CN210430919U (en) * | 2019-08-27 | 2020-04-28 | 江西洪都航空工业集团有限责任公司 | Direct-current low-power wide-pulse surge suppression circuit |
| CN211454401U (en) * | 2020-01-21 | 2020-09-08 | 福建飞毛腿动力科技有限公司 | Low-cost DC linear voltage-stabilized power supply |
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Application publication date: 20221220 |