CN216819845U

CN216819845U - Civil aviation aircraft L wave band suppression receiving circuit based on optical coupling switch

Info

Publication number: CN216819845U
Application number: CN202220425486.3U
Authority: CN
Inventors: 穆铁钢; 袁远; 庞晗; 葛成; 李乃瑞
Original assignee: China Aviation Control System Equipment Co ltd
Current assignee: China Aviation Control System Equipment Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-06-24
Anticipated expiration: 2032-03-01

Abstract

The utility model discloses a civil aviation aircraft L-band suppression receiving circuit based on an optical coupling switch, which comprises a charging unit (1), a conduction unit (2) and the optical coupling switch (3), wherein the charging unit (1) charges and turns on the conduction unit (2) after receiving an external suppression signal, the conduction unit (2) turns on the optical coupling switch (3) when the charging unit (1) is charged, so that the optical coupling switch (3) emits the suppression signal, and the conduction unit (2) turns off the optical coupling switch (3) after the charging unit (1) is charged. The embodiment can enable the correct suppression signal to be suppressed in the transmission stage, release the pulse signal in the non-transmission stage, and ensure that deadlock suppression of an external circuit is not transmitted through the charging unit and the conducting unit.

Description

Civil aviation aircraft L wave band suppression receiving circuit based on optical coupling switch

Technical Field

The utility model relates to a civil aviation aircraft L-band suppression receiving circuit based on an optical coupler switch.

Background

Many devices used by civil aviation aircraft operate in the L-band, such as traffic collision avoidance systems, navigation management transponders, distance measurement systems, tacan navigation systems, and the like. Because the working frequencies of all the systems are close, if radio signals are transmitted simultaneously, the systems can interfere with each other and can influence respective functions, therefore, all the devices working in the L waveband can only have unique devices to transmit at the same time, the receiving is the same, when the L waveband devices on an aircraft transmit the radio signals, L waveband electromagnetic waves in the space can be interfered by the local devices, and the L waveband devices can also distort when receiving external signals.

Disclosure of Invention

The utility model aims to provide an L-band suppression receiving circuit of a civil aviation aircraft based on an optical coupling switch, when any device working in an L band sends a suppression signal, the L-band suppression circuit outputs a high level, and other devices monitor the suppression signal of the high level, shield respective transmitting functions and remind the devices of interference of the received signal at the moment.

The utility model aims to be realized by the following technical scheme:

the utility model provides a civilian aviation aircraft L wave band restraines receiving circuit based on opto-coupler switch, contains charging unit 1, switches on unit 2 and opto-coupler switch 3, charging unit 1 charges and opens and switches on unit 2 after receiving outside inhibitory signal, switches on unit 2 and switches on opto-coupler switch 3 when charging unit 1 charges, makes opto-coupler switch 3 transmission inhibitory signal, switches on unit 2 and closes opto-coupler switch 3 after charging unit 1 charges and accomplishes.

Preferably, the charging unit 1 is composed of a capacitor C2001, a capacitor C2002, and a capacitor C2003 connected in parallel.

Preferably, the turn-on unit 2 is an NPN transistor Q2001.

Preferably, a pair of diodes D2010 are added between the charging unit 1 and the conducting unit 2.

Preferably, a resistor R2021 is connected in parallel to the pair of diodes D2010.

Preferably, a resistor R2022 is connected in series with the output terminals of the pair of diodes D2010 and the resistor R2021.

Preferably, resistors R2019 and R2020 are connected in parallel to the input end of the charging unit 1.

Preferably, a resistor R2027 is connected to the anode of the optical coupling switch 3.

Preferably, a resistor R2033 is connected to the collector of the optocoupler switch 3.

Drawings

Fig. 1 is a schematic structural diagram of an L-band rejection receiving circuit of a civil aviation aircraft based on an optocoupler switch in an embodiment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The optical coupling switch is also called as a photoelectric isolator, which is called as an optical coupler for short, and transmits an electric signal by taking light as a medium. It has good isolation function to input and output electric signal, so it is widely used in various circuits, and it is one of the most widely used photoelectric devices. The optocoupler is generally divided into three parts: light emission, light reception, and signal amplification. The input electric signal drives the light emitting diode to emit light with a certain wavelength, and the receiving detector receives the light to generate current which is amplified and output. This completes the conversion from electricity to light to electricity.

Referring to fig. 1, the receiving circuit is restrained to civilian aviation aircraft L wave band based on opto-coupler switch that this embodiment shows contains charging unit 1, switches on unit 2 and opto-coupler switch 3, and charging unit 1 charges and opens and switch on unit 2 after receiving outside inhibit signal, switches on unit 2 and switches on opto-coupler switch 3 when charging unit 1 charges, makes opto-coupler switch 3 transmission inhibit signal, switches on unit 2 and closes opto-coupler switch 3 after charging unit 1 charges and accomplishes. This embodiment can make the correct inhibit signal inhibit in the transmit phase, release the pulse signal without transmit phase, and ensure that the deadlock inhibition of the external circuit is not transferred in through the charging unit 1 and the conducting unit 2.

By way of illustration, in the present embodiment, the charging unit 1 is composed of a capacitor C2001, a capacitor C2002 and a capacitor C2003 connected in parallel, and an external suppression signal may play a role of voltage noise isolation when passing through the capacitor C2001, the capacitor C2002 and the capacitor C2003.

By way of illustration, in the present embodiment, a transistor Q2001 is used as the conducting unit 2, and in the present embodiment, the transistor Q2001 has a model of MMBT5551LT1GSOT23, and is an NPN-type switching transistor, which has no amplification effect but can be turned on and off. The triode Q2001 is turned on through a suppression signal of the charging unit 1, in the charging process of the charging unit 1, the triode Q2001 establishes voltage to enable the optocoupler switch 3 to be conducted, a light emitting diode of the optocoupler switch can emit light, and a to chip port obtains a low level; otherwise, the to chip port is high. After the charging unit 1 finishes charging, the triode Q2001 switch is turned off, so that the optocoupler switch is turned off, and when an external locking signal is always high, continuous locking cannot be performed, so that the device is effectively prevented from being locked due to locking link faults.

As an example, in this embodiment, the optocoupler switch 3 is a TLP185 optocoupler switch, an onboard power supply on the civil aviation aircraft is 28V, and the working level of the suppression signal also adopts 28V, so that the power supply can be conveniently obtained to provide the suppression signal for each device. The general signal level of the core processing chip of each device is lower than 5V, and the TLP185 type optocoupler switch can be selected to effectively isolate and suppress the signal power level and convert the signal power level into the signal level required by the processing chip.

In this embodiment, a pair of diodes D2010 is added between the charging unit 1 and the conducting unit 2 to serve as a protection fuse of the circuit, and when the voltage is too large, the diodes can be broken down to directly conduct and ground to protect the subsequent switches of the circuit.

In this embodiment, the input end of the charging unit 1 may be connected in parallel with the resistors R2019 and R2020, the pair of diodes D2010 is connected in parallel with the resistor R2021, the output ends of the pair of diodes D2010 and the resistor R2021 are connected in series with the resistor R2022, the anode of the optocoupler switch 3 is connected with the resistor R2027, and the collector of the optocoupler switch 3 is connected with the resistor R2033, which may perform a matching voltage division function, and the resistance values of the resistors are adjusted to enable the switching circuit to operate normally.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims

1. The utility model provides a civilian aviation aircraft L wave band restraines receiving circuit based on opto-coupler switch, contain charging unit (1), switch on unit (2) and opto-coupler switch (3), its characterized in that charging unit (1) charges and opens and switch on unit (2) after receiving outside inhibitory signal, switch on unit (2) and switch on opto-coupler switch (3) when charging unit (1) charges, make opto-coupler switch (3) transmission inhibitory signal, switch on unit (2) and close opto-coupler switch (3) after charging unit (1) is charged and is accomplished.

2. The civil aviation aircraft L-band rejection receiving circuit based on the optical coupling switch as claimed in claim 1, wherein the charging unit (1) is composed of a capacitor C2001, a capacitor C2002 and a capacitor C2003 which are connected in parallel.

3. The civil aviation aircraft L-band rejection receiving circuit based on the optocoupler switch as claimed in claim 1, characterized in that the conducting unit (2) is an NPN-type triode Q2001.

4. The civil aviation aircraft L-band rejection receiving circuit based on the optical coupler switch as claimed in claim 1, wherein a pair of diodes D2010 are added between the charging unit (1) and the conducting unit (2).

5. The L-band rejection receiving circuit of the civil aviation aircraft based on the optical coupling switch as claimed in claim 4, wherein a resistor R2021 is connected in parallel at a pair of diodes D2010.

6. The L-band rejection receiving circuit of a civil aviation aircraft based on an optical coupling switch as claimed in claim 5, wherein a resistor R2022 is connected in series with the output ends of a pair of diodes D2010 and a resistor R2021.

7. The civil aviation aircraft L-band rejection receiving circuit based on the optical coupler switch as claimed in claim 1, wherein resistors R2019 and R2020 are connected in parallel at the input end of the charging unit (1).

8. The civil aviation aircraft L-band rejection receiving circuit based on the optical coupler switch as claimed in claim 1, characterized in that a resistor R2027 is connected to the anode of the optical coupler switch (3).

9. The civil aviation aircraft L-band suppression receiving circuit based on the optical coupler switch as claimed in claim 1, characterized in that a resistor R2033 is connected to the collector of the optical coupler switch (3).