CN114597879A - Controllable aviation surge protection circuit of discharge current - Google Patents
Controllable aviation surge protection circuit of discharge current Download PDFInfo
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- CN114597879A CN114597879A CN202210328350.5A CN202210328350A CN114597879A CN 114597879 A CN114597879 A CN 114597879A CN 202210328350 A CN202210328350 A CN 202210328350A CN 114597879 A CN114597879 A CN 114597879A
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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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses an aviation surge protection circuit with controllable discharge current, which comprises a constant current source circuit and a common TVS diode circuit, wherein the input end of the constant current source circuit is connected with a direct current input signal, the output end of the constant current source circuit outputs a direct current signal and is connected with the common TVS diode circuit, a TVS tube is arranged in the common TVS diode circuit, and the constant current source circuit restrains the discharge current of the common TVS diode circuit within the bearing range of the TVS tube. The aviation surge protection circuit with controllable discharge current does not need a large number of TVS devices and a design of withstanding a higher point voltage to solve the problem of long-time surge, one universal front end completes the surge protection of the whole circuit, and 50V or 100V TVS is added at the power supply input end of the whole circuit to absorb 1.2/50u or 8/20us waveform conventional surge current to protect a rear-stage constant current source circuit due to the requirement of safety protection.
Description
Technical Field
The invention relates to the field of power supply surge protection circuits of aviation equipment, in particular to an aviation surge protection circuit with controllable discharge current.
Background
The controllable aviation surge protection circuit of discharge current is a circuit that carries out the internal diode protection of aviation surge, actual operating voltage is 29V in the standard, but surge voltage is 50V, the voltage of civilian aviation equipment can be as high as 80 to 100V, the duration is as long as 82.5ms, general TVS and piezo-resistor all are used for restraining about 1000 us's surge usually, so conventional design has two kinds of modes, one uses a large amount of TVS devices to absorb the energy, two kinds of devices that can bear 50V or 100V input voltage are used as the working device, the third kind is that add little current-limiting resistance and solitary TVS for every device, along with the continuous development of science and technology, people's requirement to controllable aviation surge protection circuit of discharge current is also higher and higher.
The existing aviation surge protection circuit with controllable discharging current has certain disadvantages when in use, in the first mode, a large amount of TVS devices occupy a large amount of PCB space, each device is slightly different, namely, a short board effect exists, once a certain device breaks down, the whole TVS protection array loses effect, meanwhile, when in TVS protection, power supply forms a low-resistance loop through a TVS tube, long-time surge can lead to long-time conduction time, and thus the power supply end of equipment is not good; second, devices that can withstand 50V or more than 100V are sometimes difficult to find in certain situations; in a third mode, each device is additionally provided with a surge current-limiting resistor and a TVS device, so that the cost and the PCB space are increased, but for a high-current power device, the mode is rigorous in selection of the current-limiting resistor and difficult to realize, and therefore, the aviation surge protection circuit with controllable discharge current is provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an aviation surge protection circuit with controllable discharge current, which does not need a large number of TVS devices and a design of withstanding more extreme voltage to solve the problem of long-time surge, can complete the surge protection of the whole circuit by one universal front end, and can effectively solve the problem in the background technology by adding 50V or 100V TVS at the power supply input end of the whole circuit to absorb the conventional surge current with the waveform of 1.2/50u or 8/20us to protect a rear-stage constant current source circuit according to the requirement of safety protection.
(II) technical scheme
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a controllable aviation surge protection circuit of discharge current, includes constant current source circuit and ordinary TVS diode circuit, direct current input signal is inserted to constant current source circuit's input, constant current source circuit's output direct current signal and with ordinary TVS diode circuit connection, be provided with the TVS pipe in the ordinary TVS diode circuit, constant current source circuit restraines the discharge current of ordinary TVS diode circuit in the bearing range of TVS pipe, sets up constant current source circuit's relevant parameter, satisfies the current value of different TVS pipes.
As a preferred technical scheme of the application, a constant current source in the constant current source circuit is composed of an MOSFET, a low-power triode and a voltage-regulator tube, and the MOSFET, the low-power triode and the voltage-regulator tube meet the withstand voltage of 50V and 100V and meet the temperature standard at the same time.
As a preferred technical solution of the present application, the selection of the MOSFET selects the power according to the magnitude of the dc input current of the device and the magnitude of the leakage current of the ordinary TVS diode circuit.
As a preferable technical solution of the present application, a transistor Q2, a field effect transistor M1, a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, and a second diode D2 are disposed inside the constant current source.
As a preferred technical solution of the present application, the triode Q2 and the field effect transistor M1 form a voltage-controlled constant current source.
As a preferred technical solution in the present application, the third resistor R3 can adjust the maximum current of the constant current source, and the first resistor R1 is a current-limiting resistor and selects different resistance values according to the power level.
As a preferred embodiment of the present invention, the resistor R1 is smaller and the resistor R3 is larger as the input dc power is larger, so as to reduce the current of the current source.
As a preferred technical solution of the present application, the first resistor R1 and the third resistor R3 regulate and protect the second diode D2, and the breakdown voltage of the second diode D2 is about 34V.
(III) advantageous effects
Compared with the prior art, the invention provides an aviation surge protection circuit with controllable discharge current, which has the following beneficial effects: the aviation surge protection circuit with controllable discharge current does not need a large number of TVS devices and a design of withstanding a more-point voltage to solve the problem of long-time surge, can complete the surge protection of the whole circuit by a universal front end, and increases a TVS of 50V or 100V at the power supply input end of the whole circuit to absorb a conventional surge current of 1.2/50u or 8/20us waveform to protect a rear-stage constant current source circuit due to the requirement of safety protection, wherein the circuit comprises two parts, one is a constant current source and the other is a single common TVS diode, the constant current source can restrain the discharge current of the TVS within the bearing range of the TVS tube, and the relevant parameters of the constant current source are set to meet the current values of different TVS, the constant current source is composed of a MOSFET, a low-power triode and a voltage stabilizing tube, which are very easy to meet the withstand voltages of 50V and 100V, meanwhile, GJB and relevant temperature standards are easily met, the selection of the MOSFET selects the power according to the current of equipment and the leakage current of the TVS, the circuit complexity and the PCB occupation space of GJB 181A-2013 standard surge protection are greatly reduced, meanwhile, the circuit is flexible and changeable, the selection of a rear-stage device does not need the withstand voltage of 50V or 100V any more, the whole discharging current controllable aviation surge protection circuit is simple in structure and convenient to operate, and the using effect is better than that of a traditional mode.
Drawings
Fig. 1 is a schematic diagram of an overall structure of an aviation surge protection circuit with controllable discharge current according to the present invention.
Fig. 2 is a schematic structural diagram of a constant current source in the aviation surge protection circuit with controllable discharge current.
Fig. 3 is a schematic structural diagram of one embodiment of the aviation surge protection circuit with controllable discharge current according to the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of the aviation surge protection circuit with controllable discharge current according to the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figures 1 and 2, an aviation surge protection circuit with controllable discharge current comprises a constant current source circuit and a common TVS diode circuit, wherein the input end of the constant current source circuit is connected with a direct current input signal, the output end of the constant current source circuit outputs a direct current signal and is connected with the common TVS diode circuit, a TVS tube is arranged in the common TVS diode circuit, the constant current source circuit restrains the discharge current of the common TVS diode circuit within the bearing range of the TVS tube, relevant parameters of the constant current source circuit are set to meet the current values of different TVS tubes, a large number of TVS devices and a design of bearing more point voltage are not needed to solve the long-time surge problem, a universal front end can complete the surge protection of the whole circuit, and for the requirement of safety protection, a TVS with 50V or 100V is added at the power supply input end of the whole circuit to absorb the conventional surge current with the waveform of 1.2/50u or 8/20us, and protecting the constant current source circuit at the later stage.
Furthermore, a constant current source in the constant current source circuit is composed of an MOSFET, a low-power triode and a voltage-regulator tube, and the MOSFET, the low-power triode and the voltage-regulator tube meet the withstand voltage of 50V and 100V and meet the temperature standard at the same time.
Further, the selection of the MOSFET selects the power according to the magnitude of the dc input current of the device and the magnitude of the leakage current of the ordinary TVS diode circuit.
Furthermore, a triode Q2, a field effect transistor M1, a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1 and a second diode D2 are arranged in the constant current source.
Further, the triode Q2 and the field effect transistor M1 form a voltage-controlled constant current source.
Furthermore, the third resistor R3 can adjust the maximum current of the constant current source, and the first resistor R1 is a current-limiting resistor, and different resistance values are selected according to the power.
Further, the larger the input dc power is, the smaller the first resistor R1 is, and the larger the third resistor R3 is, so that the current of the current source is reduced.
Further, the first resistor R1 and the third resistor R3 regulate and protect the second diode D2, and the breakdown voltage of the second diode D2 is about 34V.
Example (b):
as shown in fig. 3 and 4, fig. 3 is a graph of the current flowing through the diode D2 when the first resistor R1 is 0.05 ohm and the third resistor R3 is 4.7K ohm;
FIG. 4 is a graph of voltage waveforms for simultaneous input and output;
from the two figures, the design requirements are met by the application.
The working principle is as follows: the circuit of the application is composed of two parts, one is a constant current source, the other is a single common TVS diode, the constant current source can restrain the discharging current of the TVS within the bearing range of the TVS tube, the relevant parameters of the constant current source are set, so that different current values of the TVS can be met, the constant current source is composed of an MOSFET, a low-power triode and a voltage stabilizing tube, the voltage withstanding voltage of 50V and 100V can be very easily met, GJB and relevant temperature standards can be relatively easily met, the power is selected according to the current of equipment and the leakage current of the TVS through the selection of the MOSFET, the circuit complexity of GJB 181A-2013 standard surge protection and the occupied space of the PCB are greatly reduced, meanwhile, the circuit can be flexible and changeable, the selection of a rear-stage device does not need the voltage withstanding voltage of 50V or 100V any more, a triode Q2, a field effect tube M1 and a field effect tube M are arranged in the constant current source, The first resistor R1, the second resistor R2, the third resistor R3, the first diode D1 and the second diode D2, the triode Q2 and the field effect transistor M1 form a voltage-controlled constant current source, the third resistor R3 can adjust the maximum current of the constant current source, the first resistor R1 is a current-limiting resistor, different resistance values are selected according to the power, the higher the input direct current power is, the smaller the first resistor R1 is, the larger the third resistor R3 is, the current of the current source is reduced, the first resistor R1 and the third resistor R3 adjust and protect the second diode D2, the second diode D2 protects the breakdown voltage to be about 34V, a large number of TVS devices and a design of withstanding voltage to a point for solving the long-time surge problem are not needed, a universal front end can complete the whole circuit surge protection, and a common surge protection is required by safety protection, 50V or 100V TVS u is added at the power supply input end of the whole circuit to absorb the conventional surge current of 1.2/50 us or 8/20us waveform, and protecting the constant current source circuit at the later stage.
It is noted that, herein, relational terms such as first and second (first, second, and the like) and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (8)
1. The utility model provides a controllable aviation surge protection circuit of discharge current, includes constant current source circuit and ordinary TVS diode circuit, its characterized in that: the input of constant current source circuit inserts direct current input signal, constant current source circuit's output direct current signal and with ordinary TVS diode circuit connection, be provided with the TVS pipe in the ordinary TVS diode circuit, constant current source circuit suppresses ordinary TVS diode circuit's discharge current in the bearing range of TVS pipe, sets up constant current source circuit's relevant parameter, satisfies the current value of different TVS pipes.
2. The aviation surge protection circuit with controllable discharge current of claim 1, wherein: the constant current source in the constant current source circuit is composed of an MOSFET, a low-power triode and a voltage-regulator tube, and the MOSFET, the low-power triode and the voltage-regulator tube meet the withstand voltage of 50V and 100V and meet the temperature standard at the same time.
3. The aviation surge protection circuit with controllable discharge current of claim 1, wherein: the selection of the MOSFET selects the power according to the direct current input current of the equipment and the leakage current of the common TVS diode circuit.
4. The aviation surge protection circuit with controllable discharge current of claim 1, wherein: the triode Q2, the field effect transistor M1, the first resistor R1, the second resistor R2, the third resistor R3, the first diode D1 and the second diode D2 are arranged in the constant current source.
5. The aviation surge protection circuit with controllable discharge current of claim 4, wherein: the triode Q2 and the field effect transistor M1 form a voltage-controlled constant current source.
6. The aviation surge protection circuit with controllable discharge current of claim 4, wherein: the third resistor R3 can adjust the maximum current of the constant current source, and the first resistor R1 is a current-limiting resistor and different resistance values are selected according to the power.
7. The aviation surge protection circuit with controllable discharge current of claim 4, wherein: the larger the input direct current power is, the smaller the first resistor R1 is, and the larger the third resistor R3 is, so that the current of the current source is reduced.
8. The aviation surge protection circuit with controllable discharge current of claim 4, wherein: the first resistor R1 and the third resistor R3 are adjusted to protect the diode II D2, and the breakdown voltage of the diode II D2 is about 34V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210328350.5A CN114597879A (en) | 2022-03-30 | 2022-03-30 | Controllable aviation surge protection circuit of discharge current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210328350.5A CN114597879A (en) | 2022-03-30 | 2022-03-30 | Controllable aviation surge protection circuit of discharge current |
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| CN114597879A true CN114597879A (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210328350.5A Pending CN114597879A (en) | 2022-03-30 | 2022-03-30 | Controllable aviation surge protection circuit of discharge current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116633133A (en) * | 2023-07-21 | 2023-08-22 | 泉州艾奇科技有限公司 | Constant-current voltage stabilizing circuit |
-
2022
- 2022-03-30 CN CN202210328350.5A patent/CN114597879A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116633133A (en) * | 2023-07-21 | 2023-08-22 | 泉州艾奇科技有限公司 | Constant-current voltage stabilizing circuit |
| CN116633133B (en) * | 2023-07-21 | 2024-05-03 | 泉州艾奇科技有限公司 | Constant-current voltage stabilizing circuit |
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