CN214674875U - Surge voltage suppression circuit of airborne direct-current power supply - Google Patents
Surge voltage suppression circuit of airborne direct-current power supply Download PDFInfo
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- CN214674875U CN214674875U CN202120251902.8U CN202120251902U CN214674875U CN 214674875 U CN214674875 U CN 214674875U CN 202120251902 U CN202120251902 U CN 202120251902U CN 214674875 U CN214674875 U CN 214674875U
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Abstract
The utility model discloses an airborne DC power supply surge voltage suppression circuit, including DC power supply transmission line, field effect transistor Q1, resistance R1, resistance R3, zener diode D1 and optoelectronic coupler U1, install field effect transistor Q1 on the DC power supply transmission line, field effect transistor Q1's grid is connected with resistance R3 and ground connection; the collector of the photoelectric coupler U1 is connected with the input end of the direct-current power transmission line, the emitter of the photoelectric coupler U1 is connected with the resistor R1, the resistor R1 is connected with the input end of the direct-current power transmission line, the anode of the photoelectric coupler U1 is connected with the output end of the direct-current power transmission line, and the cathode of the photoelectric coupler U1 is connected with the voltage-stabilizing diode D1 and is grounded. The utility model discloses a 28V DC power supply's 80V, 50ms surge voltage provide a simple effectual suppression circuit, adopt components and parts small in quantity, can satisfy DC power supply performance requirement well under little volume requirement.
Description
Technical Field
The utility model relates to a DC power supply protection circuit especially relates to an airborne DC power supply surge voltage suppression circuit.
Background
The airborne direct-current power supply is important power supply equipment in the fields of aviation, radar and the like, the required safe voltage is 36V, the rated voltage of the airborne direct-current power supply is 28V (the safe voltage is 36V), 80V and 50ms surge voltage can often appear in the existing 28V airborne direct-current power supply, and the surge voltage can damage airborne equipment and influence the operation of the airborne equipment; the existing surge suppression circuit is complex in principle, large in number of adopted components and large in occupied space, cannot be directly applied to an airborne 28V direct-current power supply, cannot meet the requirement of small size of the airborne 28V direct-current power supply, and how to solve the technical problem that surge voltage of 80V and 50ms in the airborne 28V direct-current power supply is urgently needed to be solved at present.
SUMMERY OF THE UTILITY MODEL
Weak point to prior art exists, the utility model aims to provide an airborne DC power supply surge voltage suppression circuit, for 28V DC power supply's 80V, 50ms surge voltage provide a simple effectual suppression circuit, adopt components and parts small in quantity, can satisfy DC power supply performance requirement well under little volume requirement.
The purpose of the utility model is realized through the following technical scheme:
an onboard direct-current power supply surge voltage suppression circuit comprises a direct-current power supply transmission line, a field effect transistor Q1, a resistor R1, a resistor R3, a voltage stabilizing diode D1 and a photoelectric coupler U1, wherein the direct-current power supply transmission line is provided with an input end and an output end, a field effect transistor Q1 is installed on the direct-current power supply transmission line, and the grid electrode of the field effect transistor Q1 is connected with the resistor R3 and grounded; the photoelectric coupler U1 has positive pole, negative pole, collecting electrode and projecting pole, and the collecting electrode of photoelectric coupler U1 is connected with the input of direct current power supply transmission line, and the projecting pole of photoelectric coupler U1 is connected resistance R1, and resistance R1 is connected on the input of direct current power supply transmission line, and the positive pole of photoelectric coupler U1 is connected on the output of direct current power supply transmission line, and the negative pole of photoelectric coupler U1 connects zener diode D1 and ground connection.
In order to better realize the present invention, the source of the field effect transistor Q1 is connected to the input side of the dc power transmission line, and the drain of the field effect transistor Q1 is connected to the output side of the dc power transmission line.
Preferably, a resistor R2 is connected between the positive electrode of the photocoupler U1 and the output end of the direct-current power transmission line.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
(1) the utility model discloses a 28V DC power supply's 80V, 50ms surge voltage provide a simple effectual suppression circuit, adopt components and parts small in quantity, can satisfy DC power supply performance requirement well under little volume requirement.
(2) The utility model discloses the components and parts that use are small in quantity, and the circuit is reliable and easily realize, and this circuit still is applicable to the service condition of various power, and occupation space is little, and calorific capacity of normal during operation is little, need not to carry on extra heat dissipation condition just can normally work.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention;
fig. 2 is a schematic diagram of the surge voltage suppression of the present invention.
Wherein, the names corresponding to the reference numbers in the drawings are:
1-direct current power transmission line, 11-input end, 12-output end.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
examples
As shown in fig. 1, an on-board dc power supply surge voltage suppression circuit includes a dc power supply transmission line 1, a field effect transistor Q1, a resistor R1, a resistor R3, a zener diode D1, and a photocoupler U1, where the dc power supply transmission line 1 has an input terminal 11 and an output terminal 12, the dc power supply transmission line 1 is mounted with a field effect transistor Q1, a gate of the field effect transistor Q1 is connected to the resistor R3 and grounded, as shown in fig. 1, one end of the resistor R3 is grounded, and the other end of the resistor R3 is further connected to an emitter of the photocoupler U1, so that a gate of the field effect transistor Q1 is also connected to the emitter of the photocoupler U1. The photocoupler U1 has a positive electrode (corresponding to the leading-out terminal at the position of the number "1" in fig. 1), a negative electrode (corresponding to the leading-out terminal at the position of the number "2" in fig. 1), a collector electrode (corresponding to the leading-out terminal at the position of the number "4" in fig. 1) and an emitter electrode (corresponding to the leading-out terminal at the position of the number "3" in fig. 1), the collector electrode of the photocoupler U1 is connected with the input end 11 of the direct-current power transmission line 1, the emitter electrode of the photocoupler U1 is connected with the resistor R1, the resistor R1 is connected to the input end 11 of the direct-current power transmission line 1, the positive electrode of the photocoupler U1 is connected to the output end 12 of the direct-current power transmission line 1, and the negative electrode of the photocoupler U1 is connected with the voltage-stabilizing diode D1 and grounded. The source of the field effect transistor Q1 is connected to the input terminal 11 side of the dc power transmission line 1, and the drain of the field effect transistor Q1 is connected to the output terminal 12 side of the dc power transmission line 1. And a resistor R2 is connected between the positive electrode of the photoelectric coupler U1 and the output end 12 of the direct-current power transmission line 1. The utility model discloses connect good airborne DC power supply surge voltage suppression circuit according to figure 1 and above-mentioned circuit connection method, constitute switch voltage regulator circuit, realize the suppression to 80V, 50ms surge voltage through the switching state of field effect transistor Q1, when the electricity of normal 28V voltage is imported from Vin + in figure 1, Vgs of field effect transistor Q1 is more than or equal to Vgs (th), wherein Vgs is the voltage between field effect transistor Q1 collecting electrode (collecting electrode correspondence is g) and source electrode (source electrode correspondence is s), Vgs (th) is the turn-on voltage of field effect transistor Q1, when the circuit design, confirm resistance R1, resistance R3, resistance R2, Vgs of field effect transistor Q1 is more than or equal to (th), field effect transistor Q1 switches on, under the effect of zener diode D1, common setting confirms that the clamping voltage V1 of transistor Q1 is 34V + -1V, when Vin + input voltage V1 is more than or equal to, the photocoupler U1 works, at this time, Vgs is less than Vgs (th), the field effect transistor Q1 is turned off, and then the direct-current power supply transmission line 1 is switched back and forth between the two states, so that the output voltage is always kept about 34V (under safe voltage, the output voltage does not affect the operation of airborne equipment), and the effect of suppressing voltage is achieved, as shown in FIG. 2; thus, when 80V and 50ms surge voltage is input to the Vin + end of the direct current power transmission line 1, the output voltage is suppressed to 34V.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The utility model provides an airborne DC power supply surge voltage suppression circuit, includes DC power supply transmission line (1), and DC power supply transmission line (1) has input (11) and output (12), its characterized in that: the direct current power supply circuit also comprises a field effect transistor Q1, a resistor R1, a resistor R3, a voltage stabilizing diode D1 and a photoelectric coupler U1, wherein a field effect transistor Q1 is installed on the direct current power supply transmission line (1), and the grid electrode of the field effect transistor Q1 is connected with a resistor R3 and grounded; the photoelectric coupler U1 is provided with an anode, a cathode, a collector and an emitter, the collector of the photoelectric coupler U1 is connected with the input end (11) of the direct-current power transmission line (1), the emitter of the photoelectric coupler U1 is connected with the resistor R1, the resistor R1 is connected to the input end (11) of the direct-current power transmission line (1), the anode of the photoelectric coupler U1 is connected to the output end (12) of the direct-current power transmission line (1), and the cathode of the photoelectric coupler U1 is connected with the voltage stabilizing diode D1 and is grounded.
2. An on-board dc power supply surge voltage suppression circuit according to claim 1, wherein: the source of the field effect transistor Q1 is connected to the input end (11) side of the direct current power transmission line (1), and the drain of the field effect transistor Q1 is connected to the output end (12) side of the direct current power transmission line (1).
3. An on-board dc power supply surge voltage suppression circuit according to claim 1, wherein: and a resistor R2 is connected between the positive electrode of the photoelectric coupler U1 and the output end (12) of the direct-current power supply transmission line (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120251902.8U CN214674875U (en) | 2021-01-29 | 2021-01-29 | Surge voltage suppression circuit of airborne direct-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120251902.8U CN214674875U (en) | 2021-01-29 | 2021-01-29 | Surge voltage suppression circuit of airborne direct-current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214674875U true CN214674875U (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120251902.8U Active CN214674875U (en) | 2021-01-29 | 2021-01-29 | Surge voltage suppression circuit of airborne direct-current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214674875U (en) |
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2021
- 2021-01-29 CN CN202120251902.8U patent/CN214674875U/en active Active
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