CN107769533B - Long-time overload power supply circuit - Google Patents
Long-time overload power supply circuit Download PDFInfo
- Publication number
- CN107769533B CN107769533B CN201710942335.9A CN201710942335A CN107769533B CN 107769533 B CN107769533 B CN 107769533B CN 201710942335 A CN201710942335 A CN 201710942335A CN 107769533 B CN107769533 B CN 107769533B
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- CN
- China
- Prior art keywords
- power supply
- resistor
- effect transistor
- supply circuit
- field effect
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/344—Active dissipative snubbers
Abstract
The invention relates to a long-time overload power supply circuit, which comprises an overload power supply circuit and a low-load power supply circuit, wherein the overload power supply circuit is connected with the low-load power supply circuit; the overload power supply circuit and the low-load power supply circuit are connected in parallel; the direct output is carried out for the voltage of + 28V; the voltage of +80V is adjusted to be within +40V through the power supply voltage adjusting module and then is output, and safe and reliable work of a subsequent circuit in overvoltage is achieved.
Description
Technical Field
The invention relates to power supply circuit overload power supply, in particular to long-time power supply circuit overload power supply.
Background
The steady-state power supply range of the aviation direct current +28V power supply is 25V-30V, and the direct current power supply is often accompanied by an overvoltage surge of 80V/50 mS. The surge voltage greatly exceeds the power supply range of the steady voltage, so that the whole system can be halted, communication is stopped, and the electric equipment is mistakenly operated and damaged.
Disclosure of Invention
The purpose of the invention is as follows: when the power supply voltage is suddenly changed from +28V to 80V, the voltage of the output power supply is adjusted within 40V of the power supply range of the secondary power supply, and the power consumption requirement of subsequent equipment is met.
The technical scheme of the invention is as follows:
the long-time overload power supply circuit comprises an overload power supply circuit and a low-load power supply circuit; the overload power supply circuit and the low-load power supply circuit are connected in parallel;
the overload power supply circuit comprises a field effect transistor Q3, a diode D2 and a resistor, wherein the field effect transistor Q3 works in a switching state; when the power supply voltage is increased from +28V to +80V, the field effect transistor Q3 is conducted, and the drain electrode is connected with the resistor in series to reduce the overvoltage, and then the overvoltage is output through the diode D2 to serve as the output end of the overload power supply circuit;
the low-load power supply circuit comprises a field effect transistor Q1, a field effect transistor Q2, a capacitor C1, a diode D1 and resistors R1-R5; the anode of the power circuit, the resistor R2, the capacitor C1 and the resistor R3 are connected in series and then grounded; the anode of the power circuit, the resistor R1 and the resistor R4 are connected in series and then grounded; the source electrode of the field effect transistor Q1 is connected with the anode of the power circuit, the grid electrode of the field effect transistor Q1 is connected between the capacitor C1 and the resistor R3, and the drain electrode of the field effect transistor Q1 is connected between the resistor R1 and the resistor R4; the source electrode of the field effect transistor Q2 is connected with the anode of the power supply circuit, the drain electrode of the field effect transistor Q2 is connected with the resistor R5 in series and then is grounded, the grid electrode of the field effect transistor Q2 is connected between the resistor R1 and the resistor R4, and the drain electrode of the field effect transistor Q2 is connected with the diode D1 in series and then serves as the output end of the low-load power supply circuit; the field-effect transistor Q1 and the field-effect transistor Q2 work in a switching state, when the power supply voltage is +28V, the field-effect transistor Q1 is turned off, and when the power supply voltage is more than +28V, the field-effect transistor Q1 is turned on; when the FET Q1 is turned off, the FET Q2 outputs +28V voltage as the low load power supply circuit output terminal through the drain.
Particularly, the type of the field effect transistors Q1-Q3 is IRF9640, and the rated constant voltage is + 100V; the capacitance C1 is 20 μ F; the resistances of the resistors R1-R9 are 3K omega, 25K omega, 47K omega, 10K omega, 680 omega, 10K omega, 168 omega and 168 omega respectively.
Advantageous effects
The circuit realizes a design method for limiting the output power supply of the circuit within the safe working range of electric equipment when an over-voltage surge of 80V occurs in a direct current +28V power supply system.
Drawings
FIG. 1 is a circuit diagram of the present invention;
Detailed Description
The invention provides a specific embodiment with the combination of the following drawings: the overload power supply circuit and the low-load power supply circuit are included; the overload power supply circuit and the low-load power supply circuit are connected in parallel;
the overload power supply circuit comprises a field effect transistor Q3, a diode D2 and a resistor, wherein the field effect transistor Q3 works in a switching state; when the power supply voltage suddenly rises to the maximum +80V, the field effect transistor Q3 is conducted, and the drain electrode is connected in series with a resistor and a diode D2 and then serves as the output end of the overload power supply circuit;
the low-load power supply circuit comprises a field effect transistor Q1, a field effect transistor Q2, a capacitor C1, a diode D1 and resistors R1-R5; the anode of the power circuit, the resistor R2, the capacitor C1 and the resistor R3 are connected in series and then grounded; the anode of the power circuit, the resistor R1 and the resistor R4 are connected in series and then grounded; the source electrode of the field effect transistor Q1 is connected with the anode of the power circuit, the grid electrode of the field effect transistor Q1 is connected between the capacitor C1 and the resistor R2, and the drain electrode of the field effect transistor Q1 is connected between the resistor R1 and the resistor R4; the source electrode of the field effect transistor Q2 is connected with the anode of the power supply circuit, the drain electrode of the field effect transistor Q2 is connected with the resistor R5 in series and then is grounded, the grid electrode of the field effect transistor Q2 is connected between the resistor R1 and the resistor R4, and the drain electrode of the field effect transistor Q2 is connected with the diode D1 in series and then serves as the output end of the low-load power supply circuit; the field-effect transistor Q1 and the field-effect transistor Q2 work in a switching state, when the power supply voltage is equal to +28V, the field-effect transistor Q1 is turned off, and when the power supply voltage suddenly changes to +80V, the field-effect transistor Q1 is turned on; when the field effect transistor Q1 is turned off, the field effect transistor Q2 outputs +28V voltage as the output end of the low-load power supply circuit through the drain electrode; wherein the type of the field effect transistors Q1-Q3 is IRF 9640; the rated constant voltage of the field effect transistor Q3 is + 100V; the capacitance C1 is 20 μ F; in the overload power supply circuit, the anode of the power supply circuit, a resistor R6 and a resistor R7 are connected in series and then grounded; the grid of the field effect transistor Q3 is connected between the resistor R6 and the resistor R7, the source is connected with the anode of the power circuit, the drain, the resistor R8 and the resistor R9 are connected in series and then grounded, and a diode is connected between the resistor R8 and the resistor R9 and serves as the output end of the overload power supply circuit; the resistances of the resistors R1-R9 are 3K omega, 25K omega, 47K omega, 10K omega, 680 omega, 10K omega, 168 omega and 168 omega respectively.
The circuit can adjust and lengthen the length of the overload time by adjusting the values of R2, C1 and R3.
Claims (2)
1. A long-time overload power supply circuit comprises an overload power supply circuit and a low-load power supply circuit; the overload power supply circuit and the low-load power supply circuit are connected in parallel;
the overload power supply circuit comprises a field effect transistor Q3, a diode D2 and a resistor, wherein the field effect transistor Q3 works in a switching state; when the power supply voltage is increased from +28V to +80V, the field effect transistor Q3 is conducted, and the drain electrode is connected with the resistor in series to reduce the overvoltage, and then the overvoltage is output through the diode D2 to serve as the output end of the overload power supply circuit;
the low-load power supply circuit comprises a field effect transistor Q1, a field effect transistor Q2, a capacitor C1, a diode D1 and resistors R1-R5; the anode of the power circuit, the resistor R2, the capacitor C1 and the resistor R3 are connected in series and then grounded; the anode of the power circuit, the resistor R1 and the resistor R4 are connected in series and then grounded; the source electrode of the field effect transistor Q1 is connected with the anode of the power circuit, the grid electrode of the field effect transistor Q1 is connected between the capacitor C1 and the resistor R3, and the drain electrode of the field effect transistor Q1 is connected between the resistor R1 and the resistor R4; the source electrode of the field effect transistor Q2 is connected with the anode of the power supply circuit, the drain electrode of the field effect transistor Q2 is connected with the resistor R5 in series and then is grounded, the grid electrode of the field effect transistor Q2 is connected between the resistor R1 and the resistor R4, and the drain electrode of the field effect transistor Q2 is connected with the diode D1 in series and then serves as the output end of the low-load power supply circuit; the field-effect transistor Q1 and the field-effect transistor Q2 work in a switching state, when the power supply voltage is +28V, the field-effect transistor Q1 is turned off, and when the power supply voltage is more than +28V, the field-effect transistor Q1 is turned on; when the field effect transistor Q1 is turned off, the field effect transistor Q2 outputs +28V voltage as the output end of the low-load power supply circuit through the drain electrode;
in the overload power supply circuit, the anode of the power supply circuit, a resistor R6 and a resistor R7 are connected in series and then grounded; the grid of the field effect transistor Q3 is connected between the resistor R6 and the resistor R7, the source is connected with the anode of the power circuit, the drain, the resistor R8 and the resistor R9 are connected in series and then grounded, and a diode is connected between the resistor R8 and the resistor R9 and serves as the output end of the overload power supply circuit; the resistances of the resistors R1-R9 are 3K omega, 25K omega, 47K omega, 10K omega, 680 omega, 10K omega, 168 omega and 168 omega respectively.
2. A long time overload power supply circuit as claimed in claim 1, wherein: the type of the field effect transistors Q1-Q3 is IRF9640, and the rated constant voltage is + 100V; the capacitance C1 is 20 μ F; the resistances of the resistors R1-R9 are 3K omega, 25K omega, 47K omega, 10K omega, 680 omega, 10K omega, 168 omega and 168 omega respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710942335.9A CN107769533B (en) | 2017-10-11 | 2017-10-11 | Long-time overload power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710942335.9A CN107769533B (en) | 2017-10-11 | 2017-10-11 | Long-time overload power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107769533A CN107769533A (en) | 2018-03-06 |
| CN107769533B true CN107769533B (en) | 2019-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710942335.9A Active CN107769533B (en) | 2017-10-11 | 2017-10-11 | Long-time overload power supply circuit |
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| Country | Link |
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| CN (1) | CN107769533B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201682411U (en) * | 2010-04-29 | 2010-12-22 | 湖南文理学院 | Switch control circuit with short circuit protection |
| CN202231609U (en) * | 2011-08-03 | 2012-05-23 | 深圳市英威腾电气股份有限公司 | Current-limiting device and electric system |
| JP6033709B2 (en) * | 2013-02-28 | 2016-11-30 | ルネサスエレクトロニクス株式会社 | Semiconductor device |
| CN204190374U (en) * | 2014-06-19 | 2015-03-04 | 安徽华东光电技术研究所 | A kind of DC power supply anti-surge protection circuit |
| CN206422515U (en) * | 2016-12-08 | 2017-08-18 | 深圳市振华微电子有限公司 | Surge suppressor |
| CN207304369U (en) * | 2017-10-23 | 2018-05-01 | 桂林航天工业学院 | High-reliability power source circuit for Beidou communication base station |
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2017
- 2017-10-11 CN CN201710942335.9A patent/CN107769533B/en active Active
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| Publication number | Publication date |
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| CN107769533A (en) | 2018-03-06 |
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