Wireless transmission and control interlocking circuit and control method thereof

Abstract

The invention discloses a wireless transmission and control interlocking circuit and a control method thereof.The wireless transmission and control interlocking circuit comprises a discrete magnitude redundant backup unit, a discrete magnitude acquisition interface unit, a logic unit and a power supply on-off control unit, and the discrete magnitude redundant backup unit is used for conducting redundant backup on externally input discrete magnitude signals; the discrete magnitude acquisition interface unit is used for receiving the discrete magnitude signal input from the outside and converting the discrete magnitude signal into a voltage signal, and the logic unit is used for outputting a power supply on-off signal according to the voltage signal and a preset wireless transmission condition. The power supply on-off control unit is used for controlling a power supply of the wireless transmission module according to the power supply on-off signal, and the logic unit does not comprise a programmable device. The method can effectively reduce the occurrence of wrong decoding results caused by damage of a certain device on a signal path of certain discrete magnitude input, and can be widely applied to the technical field of wireless transmission.

Description

Technical Field

[0001] The present invention relates to the field of wireless transmission technology, in particular to a wireless transmission and control interlocking circuit and a control method thereof. Background Art

[0002] With the development of civil aviation technology, the degree of comprehensive integration of aviation airborne equipment is getting higher and higher. Modern civil aircraft are basically equipped with wireless quick access recorders to help airlines monitor the flight quality and maintenance quality of aircraft. The wireless quick access recorder stores and records the aircraft system parameters transmitted by the onboard real-time monitoring system. After the flight, the flight data can be automatically downloaded by wirelessly using the ground mobile phone network. At the same time, the data can also be obtained by picking up the card on the ground for ground analysis and processing. The wireless quick access recorder can also automatically determine whether to turn on the wireless data transmission function through the built-in program, so as to turn on the wireless transmission function when the aircraft is suitable for wireless data transmission, and turn off the wireless transmission function when the aircraft is not suitable for wireless data transmission (such as when the aircraft is preparing to take off or landing), so as to reduce the interference and impact of wireless transmission on onboard communications.

[0003] Most of the existing wireless transmission module communication power supply control in wireless quick access recorders uses software processors to detect external trigger signals (such as sensors) through discrete digital levels or some low-speed buses (IIC, RS232 / 422 / 429, etc.), and then identify them through internal software algorithms, and control the MOS on and off power supply of the wireless transmission module through processor pin output. Software processing is easily affected by interference such as power-on and power-off timing, power supply fluctuations, reset levels, temporary interruptions of external trigger signals, etc., leading to misjudgment, or the processor's own code is not robust, the processor's working conditions are limited, resulting in abnormal program execution, etc. Summary of the invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide a wireless transmission and control interlocking circuit and a control method thereof, which can reduce the occurrence of erroneous decoding results.

[0005] To achieve the above-mentioned purpose, one aspect of an embodiment of the present application proposes a wireless transmission and control interlocking circuit, including a discrete quantity redundant backup unit, a discrete quantity acquisition interface unit, a logic unit and a power on-off control unit, wherein the output end of the discrete quantity redundant backup unit is connected to the input end of the discrete quantity acquisition interface unit, the output end of the discrete quantity acquisition interface unit is connected to the input end of the logic unit, the output end of the logic unit is connected to the input end of the power on-off control unit, the discrete quantity redundant backup unit is used to perform redundant backup of externally input discrete quantity signals, the discrete quantity acquisition interface unit is used to receive the externally input discrete quantity signals and convert the discrete quantity signals into voltage signals, the logic unit is used to output a power on-off signal according to the voltage signal and a preset wireless transmission condition, and the power on-off control unit is used to control the power supply of the wireless transmission module according to the power on-off signal, wherein the logic unit does not contain a programmable device.

[0006] In some embodiments, the wireless transmission and control interlock circuit also includes a power supply unit, the output end of the power supply unit is connected to the input end of the power on / off control unit, and the power supply unit is used to convert a first power signal output by a power board in the wireless quick access recorder into a second power signal, and output the second power signal to the power on / off control unit.

[0007] In some embodiments, the discrete quantity redundant backup unit includes a first transistor, a second transistor, a first capacitor and a second capacitor, the negative electrodes of the first transistor and the second transistor are both connected to the discrete quantity input terminal, the positive electrode of the first transistor is grounded through the first capacitor, and the positive electrode of the second transistor is grounded through the second capacitor, the positive electrodes of the first transistor and the second transistor are also connected to the discrete quantity acquisition interface unit, the first transistor and the second transistor are used to divide the discrete quantity signal into a first discrete quantity signal and a second discrete quantity signal, and perform redundant backup of the first discrete quantity signal and the second discrete quantity signal, the first capacitor is used to filter the first discrete quantity signal, and the second capacitor is used to filter the second discrete quantity signal.

[0008] In some embodiments, the logic unit includes an XNOR gate circuit, an OR gate circuit, a first inverter and a second inverter, the first inverter is connected to the XNOR gate circuit, the XNOR gate circuit is connected to the OR gate circuit, the OR gate circuit is connected to the second inverter, the first inverter, the XNOR gate circuit and the OR gate circuit are also connected to the discrete quantity acquisition interface unit, the second inverter is also connected to the power on-off control unit, the XNOR gate circuit, the OR gate circuit, the first inverter and the second inverter are used to output a power on-off signal according to the voltage signal and the wireless transmission condition.

[0009] In some embodiments, the power on-off control unit includes a first power switch module and a second power switch module, the output ends of the logic unit and the power supply unit are connected to the input end of the first power switch module, the output end of the first power switch module is connected to the second power switch module, the first power switch module is used to control the power supply of the wireless transmission module to be turned on or off according to the power on-off signal, and the second power switch module is used to cut off the power supply line of the wireless transmission module according to a preset abnormal condition.

[0010] In some embodiments, the first power switch module includes a main switch tube circuit, a driving tube circuit, an output discharge circuit and an output status monitoring circuit. The driving tube circuit, the output discharge circuit and the output status monitoring circuit are all connected to the main switch tube circuit. The output discharge circuit and the output status monitoring circuit are also connected to the driving tube circuit. The driving tube circuit is used to control the voltage of the main switch tube circuit according to the power on-off signal. The output discharge circuit is used to control the discharge of the main switch tube circuit. The main switch tube circuit is used to control the power supply to be turned on or off and output a power status signal. The output status monitoring circuit is used to send the power status signal to the main control board in the wireless quick access recorder.

[0011] In some embodiments, the power on-off control unit also includes a third power switch module, and the output ends of the first power switch module and the second power switch module are both connected to the third power switch module, and the third power switch module is used to turn on the power supply of the wireless transmission module according to the control signal output by the main control board in the wireless quick access recorder.

[0012] To achieve the above object, another aspect of the embodiment of the present application provides a control method for a wireless transmission and control interlocking circuit, comprising the following steps:

[0013] The discrete quantity redundant backup unit is used to perform redundant backup of the external input discrete quantity signal;

[0014] Receive the discrete quantity signal input from the outside through the discrete quantity acquisition interface unit, and convert the discrete quantity signal into a voltage signal;

[0015] Outputting a power on / off signal according to the voltage signal and a preset wireless transmission condition through a logic unit;

[0016] Controlling the power supply of the wireless transmission module according to the power on / off signal through the power on / off control unit;

[0017] Wherein, the logic unit does not include a programmable device.

[0018] In some embodiments, the control method further includes:

[0019] The first power signal output by the power board in the wireless quick access recorder is converted into a second power signal by the power supply unit, and the second power signal is output to the power on / off control unit.

[0020] In some embodiments, the power on / off control unit includes a first power switch module and a second power switch module, and the power on / off control unit controls the power supply of the wireless transmission module according to the power on / off signal, specifically including:

[0021] Controlling the power supply to be turned on or off according to the power on / off signal by the first power switch module;

[0022] The second power switch module cuts off the power supply line of the wireless transmission module according to a preset abnormal condition.

[0023] The beneficial effects of the present invention are as follows: a wireless transmission and control interlocking circuit and a control method thereof of the present invention include a discrete quantity redundant backup unit, a discrete quantity acquisition interface unit, a logic unit, and a power on / off control unit. On the one hand, the present invention performs redundant backup of external input discrete quantity signals through the discrete quantity redundant backup unit, which can effectively reduce the occurrence of erroneous decoding results due to damage to a certain device on the signal path of a certain discrete quantity input; on the other hand, the logic unit does not contain any programmable device, and there is no black box in the logic unit, so the input-output correspondence is clear and unique. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution in the embodiments of the present invention, the following introduction is made to the drawings required for use in the embodiments of the present invention. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solution of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A structural block diagram of a wireless transmission and control interlocking circuit provided by an embodiment of the present invention;

[0026] Figure 2 An overall circuit schematic diagram of a wireless transmission and control interlocking circuit provided by an embodiment of the present invention;

[0027] Figure 3 A circuit schematic diagram of a power supply unit provided in an embodiment of the present invention;

[0028] Figure 4 A circuit schematic diagram of a discrete quantity redundant backup unit provided in an embodiment of the present invention;

[0029] Figure 5 A circuit schematic diagram of a logic unit provided by an embodiment of the present invention;

[0030] Figure 6 A circuit schematic diagram of a second power switch module provided in an embodiment of the present invention;

[0031] Figure 7 A circuit schematic diagram of a first power switch module provided in an embodiment of the present invention;

[0032] Figure 8 A flowchart of a method for controlling a wireless transmission and control interlocking circuit provided by an embodiment of the present invention.

[0033] Figure symbols: U1, first comparator; U2, second comparator; R5, fifth resistor; C8, eighth capacitor; D11, first diode; D1, first transistor; D2, second transistor; C1, first capacitor; C2, second capacitor; UB1, first inverter; UB2, second inverter; Q4, fourth switch tube; Q5, fifth switch tube; Q6, sixth switch tube; Q7, seventh switch tube; C42, forty-second capacitor; C43, forty-third capacitor; C44, forty-fourth capacitor; R18, eighteenth resistor; R19, nineteenth resistor; R20, twentieth resistor; R21, twenty-first resistor; R22, twenty-second resistor. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the attached claims.

[0035] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0036] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0037] With the development of civil aviation technology, the degree of comprehensive integration of aviation airborne equipment is getting higher and higher. Modern civil aircraft are basically equipped with wireless quick access recorders to help airlines monitor the flight quality and maintenance quality of aircraft. The wireless quick access recorder stores and records the aircraft system parameters transmitted by the onboard real-time monitoring system. After the flight, the flight data can be automatically downloaded by wirelessly using the ground mobile phone network. At the same time, the data can also be obtained by picking up the card on the ground for ground analysis and processing. The wireless quick access recorder can also automatically determine whether to turn on the wireless data transmission function through the built-in program, so as to turn on the wireless transmission function when the aircraft is suitable for wireless data transmission, and turn off the wireless transmission function when the aircraft is not suitable for wireless data transmission (such as when the aircraft is preparing to take off or landing), so as to reduce the interference and impact of wireless transmission on onboard communications.

[0038] Most of the existing wireless transmission module communication power supply control in wireless quick access recorders uses software processors to detect external trigger signals (such as sensors) through discrete digital levels or some low-speed buses (IIC, RS232 / 422 / 429, etc.), and then identify them through internal software algorithms, and control the MOS on and off power supply of the wireless transmission module through processor pin output. Software processing is easily affected by interference such as power-on and power-off timing, power supply fluctuations, reset levels, temporary interruptions of external trigger signals, etc., leading to misjudgment, or the processor's own code is not robust, the processor's working conditions are limited, resulting in abnormal program execution, etc.

[0039] To this end, an embodiment of the present invention proposes a wireless transmission and control interlocking circuit, including a discrete quantity redundant backup unit, a discrete quantity acquisition interface unit, a logic unit, and a power on / off control unit. On the one hand, the present invention uses the discrete quantity redundant backup unit to perform redundant backup of the external input discrete quantity signal, which can effectively reduce the occurrence of erroneous decoding results due to damage to a certain device on the signal path of a certain discrete quantity input; on the other hand, the logic unit does not contain any programmable device, and there is no black box in the logic unit, so the input-output correspondence is clear and unique.

[0040] Reference Figure 1 , Figure 1 A structural block diagram of a wireless transmission and control interlocking circuit provided in an embodiment of the present invention, an embodiment of the present invention proposes a wireless transmission and control interlocking circuit, including a discrete quantity redundant backup unit, a discrete quantity acquisition interface unit, a logic unit and a power on-off control unit, the output end of the discrete quantity redundant backup unit is connected to the input end of the discrete quantity acquisition interface unit, the output end of the discrete quantity acquisition interface unit is connected to the input end of the logic unit, the output end of the logic unit is connected to the input end of the power on-off control unit, the discrete quantity redundant backup unit is used to perform redundant backup of externally input discrete quantity signals, the discrete quantity acquisition interface unit is used to receive externally input discrete quantity signals and convert the discrete quantity signals into voltage signals, the logic unit is used to output a power on-off signal according to the voltage signal and a preset wireless transmission condition, the power on-off control unit is used to control the power supply of the wireless transmission module according to the power on-off signal, wherein the logic unit does not contain a programmable device.

[0041] Specifically, the wireless transmission and control interlocking circuit of the embodiment of the present invention decodes multiple discrete quantity signals input from the outside, and turns on or off the power supply of the radio frequency module (i.e., the wireless transmission module) according to the decoding result, and transmits the calculation result back to the main control board to realize status monitoring. Figure 2 FIG. 1 is an overall circuit schematic diagram of a wireless transmission and control interlock circuit provided by an embodiment of the present invention. The wireless transmission and control interlock circuit is based on four external input discrete quantity signals (RFIL[1, 2, 3, 4]), four corresponding switch selection input discrete quantity signals (RFIL_SEL[1, 2, 3, 4]) and an RF override (i.e. Figure 2The discrete quantity is input into the RFOV (in the center), and is converted into a voltage signal input by the adaptation logic unit through the discrete quantity acquisition interface unit. The aircraft air-to-ground signal, cabin door signal or engine signal can be connected. When it is judged that the flight status of the aircraft reaches the predetermined wireless transmission condition (for example, successful landing, engine shutdown, 5 minutes later), the power supply of the wireless transmission module is controlled to enable the wireless quick access recorder (WQAR) to transmit data to the ground base station in an appropriate state. When the aircraft does not reach the predetermined wireless transmission condition (such as preparing to take off or preparing to land), the wireless transmission function is turned off to prevent wireless transmission from interfering with and affecting the onboard communication.

[0042] Among them, RF override is used to override the wireless transmission and control interlock circuit. When the signal is grounded, the cellular wireless communication control wireless transmission and control interlock circuit is enabled, and there is no wireless communication transmission signal. The monitoring circuit monitors the control signal generated according to the external discrete quantity and the power supply voltage of the wireless transmission module in real time, and transmits the result back to the main control board in the wireless quick access recorder (WQAR).

[0043] Furthermore, the discrete quantity acquisition interface unit is used to receive the ground / open discrete signal input from the outside and convert it into a voltage signal input by the adaptation logic unit. The discrete quantity acquisition interface unit adopts a HOLT IC discrete quantity-digital signal conversion chip. For the open circuit signal, the digital side outputs a low level; for the ground signal, the digital side outputs a high level.

[0044] Reference Figure 1 As an optional implementation, the wireless transmission and control interlock circuit also includes a power supply unit, an output end of the power supply unit is connected to an input end of the power on / off control unit, and the power supply unit is used to convert a first power signal output by a power board in the wireless quick access recorder into a second power signal, and output the second power signal to the power on / off control unit.

[0045] Specifically, Figure 3The circuit schematic diagram of the power supply unit provided by the embodiment of the present invention is shown. The power supply unit converts the +5VDC input from the power board to +3.3VDC. It consists of an LDO circuit, an input voltage state monitoring circuit and an output voltage state monitoring circuit. The LDO circuit is the core of this part of the unit, which is used to convert the 5V power input into a fixed output of 3.3V, and can output a maximum current of 1A. The output voltage state monitoring circuit is a hysteresis comparator with a Schmidt comparator as the core. When the output voltage of the LDO circuit is greater than 3.0V, the first comparator U1 outputs a high level; when the output voltage of the LDO circuit is less than 2.7V, the first comparator U1 outputs a low level. The fifth resistor R5 and the eighth capacitor C8 at the output of the first comparator U1 form a filter circuit for eliminating interference and adjusting delay effects. The first diode D11 is used to quickly release the charge stored in the eighth capacitor C8 during the conversion of the output of the first comparator U1 from a high level to a low level. The output signal of the filtered first comparator U1 will slow down the rise time, so two series inverters are required to shape the output waveform of PSFAIL and enhance its driving capability. The input voltage state monitoring circuit is generally similar to the output voltage state monitoring circuit, except for the difference in threshold power supply: when the input voltage is greater than 4.7V, the second comparator U2 outputs a high level; when the input voltage is less than 4.5V, the second comparator U2 outputs a low level.

[0046] It should be noted that the embodiment of the present invention manages the power input and output through the Schmitt comparator, which can effectively ensure the voltage supply range and the immediate power-off processing when the power-on timing is abnormal, and the power supply is stable and reliable.

[0047] Reference Figure 4 , Figure 4 The circuit schematic diagram of the discrete quantity redundant backup unit provided in the embodiment of the present invention, further as an optional implementation mode, the discrete quantity redundant backup unit includes a first transistor D1, a second transistor D2, a first capacitor C1 and a second capacitor C2, the negative electrodes of the first transistor D1 and the second transistor D2 are both connected to the discrete quantity input terminal, the positive electrode of the first transistor D1 is grounded through the first capacitor C1, the positive electrode of the second transistor D2 is grounded through the second capacitor C2, the positive electrodes of the first transistor D1 and the second transistor D2 are also connected to the discrete quantity acquisition interface unit, the first transistor D1 and the second transistor D2 are used to divide the discrete quantity signal into a first discrete quantity signal and a second discrete quantity signal, and perform redundant backup of the first discrete quantity signal and the second discrete quantity signal, the first capacitor C1 is used to filter the first discrete quantity signal, and the second capacitor C2 is used to filter the second discrete quantity signal.

[0048] Specifically, the ACRFIL1 discrete quantity input from the external connector is divided into two in the discrete quantity redundant backup unit to obtain a first discrete quantity signal and a second discrete quantity signal, and is isolated by the identical first transistor D1 and the second transistor D2, and is EMC filtered by the same safety capacitor (i.e., the first capacitor C1 and the second capacitor C2) to generate RFIL1A and RFIL1B signals. Figure 2 As shown in the figure, the discrete quantity signals RFIL[1, 2, 3, 4] and the discrete quantity signals RFIL_SEL[1, 2, 3, 4] must be processed in the same way by the discrete quantity redundant backup unit. After passing through the unit, RFIL[1, 2, 3, 4] and RFIL_SEL[1, 2, 3, 4] generate voltage signals RFIL[1, 2, 3, 4]A / RFIL[1, 2, 3, 4]B and RFIL_SEL[1, 2, 3, 4]A / RFIL_SEL[1, 2, 3, 4]A, which are output to the discrete quantity acquisition interface unit for processing.

[0049] It should be noted that the embodiment of the present invention adopts a redundant backup design to divide the external input discrete quantity signal into two and isolate it through a transistor, which can effectively reduce the occurrence of erroneous decoding results due to damage to a device on the signal path of a discrete quantity input.

[0050] Reference Figure 5 , Figure 5 The circuit schematic diagram of the logic unit provided in the embodiment of the present invention is further provided as an optional implementation manner. The logic unit includes an XNOR gate circuit, an OR gate circuit, a first inverter UB1 and a second inverter UB2. The first inverter UB1 is connected to the XNOR gate circuit, the XNOR gate circuit is connected to the OR gate circuit, the OR gate circuit is connected to the second inverter UB2. The first inverter UB1, the XNOR gate circuit and the OR gate circuit are also connected to the discrete quantity acquisition interface unit. The second inverter UB2 is also connected to the power on / off control unit. The XNOR gate circuit, the OR gate circuit, the first inverter UB1 and the second inverter UB2 are used to output a power on / off signal according to the voltage signal and the wireless transmission condition.

[0051] Specifically, the external discrete quantity signal is converted into a voltage signal RFIL[1, 2, 3, 4]A and RFI_SEL[1, 2, 3, 4]A signal through the discrete quantity acquisition interface unit, and the RF_ENA signal (i.e., the power on / off signal) is generated through the logic unit, and the power on / off control unit at the back end is driven by the RF_ENA signal. The logic unit of the embodiment of the present invention is composed of a 74 series logic device XNOR gate, an OR gate, and an inverter, and does not contain a programmable device inside, so there is no black box in this part of the unit, and its input-output correspondence is clear and unique. When one or more logic devices fail, RF_ENA is in a low level or high impedance state, and the power on / off control unit at the back end will not be turned on; and a device with a Schmitt trigger input is used to prevent the generation of a glitch level at the output end, thereby ensuring the stability of the output end.

[0052] The signal combination of discrete signal RFIL[1, 2, 3] and discrete signal RFIL_SEL[1, 2, 3] is defined as shown in Table 1. Each pair of associated inputs, RF Interlock x and RF Interlock Select x, where x = 1, 2 or 3, is judged as "match" or "mismatch" according to the input voltage signal state.

[0053] Table 1

[0054] RF Interlock x RF Interlock Select x Result Open circuit or +27.5VDC open circuit match Open circuit or +27.5VDC Program common terminal (signal ground) No match Ground or less than +3.5VDC open circuit No match Ground or less than +3.5VDC Program common terminal (signal ground) match

[0055] The signal combination of discrete signal RFIL4 and discrete signal RFIL_SEL4 is defined as shown in Table 2. The input states of RF interlock 4 and RF interlock selection 4 are "match" or "mismatch", respectively.

[0056] Table 2

[0057] RF Interlock 4 RF Interlock Select 4 Result +27.5VDC open circuit No match +27.5VDC Program common terminal (signal ground) match Less than +3.5VDC open circuit match Less than +3.5VDC Program common terminal (signal ground) No match

[0058] At the same time, the signal RFOV is valid when it is grounded, and is invalid when it is open or the input is high, as shown in Table 3 below.

[0059] Table 3

[0060]

[0061] In summary, when the signal RFOV=1, only when the discrete quantity signals RFIL[1, 2, 3], RFIL_SEL[1, 2, 3], RFIL4 and RFIL_SEL4 are in a matching state, the power on / off signal RF_ENA=1 (i.e., RF transmission is allowed); if any one of RFIL[1, 2, 3], RFIL_SEL[1, 2, 3], RFIL4 and RFIL_SEL4 is in a mismatching state, the power on / off signal RF_ENA=0 (i.e., RF transmission is prohibited). When RFOV=0, regardless of the state of RFIL[1, 2, 3], RFIL_SEL[1, 2, 3], RFIL4 and RFIL_SEL4, the power on / off signal RF_ENA=0 (i.e., RF transmission is prohibited).

[0062] Reference Figure 2 , further as an optional implementation, the power on-off control unit includes a first power switch module and a second power switch module, the output ends of the logic unit and the power supply unit are connected to the input end of the first power switch module, the output end of the first power switch module is connected to the second power switch module, the first power switch module is used to control the power supply of the wireless transmission module to be turned on or off according to the power on-off signal, and the second power switch module is used to cut off the power supply line of the wireless transmission module according to a preset abnormal condition.

[0063] Specifically, Figure 6 The circuit schematic diagram of the second power switch module is shown. The second power switch module (i.e., the fuse-type power switch) is composed of an LC filter circuit, a fuse, and a switch tube. Under normal conditions, the input BLO_B of the second power switch module is low level, the fourth switch tube Q4 is cut off, and the 8V power input to the second power switch module is normally output to the next stage after passing through the LC filter circuit; when the preset abnormal condition is reached (i.e., the input BLO_B changes from low level to high level), the fourth switch tube Q4 is turned on, the power output is short-circuited to the ground, and the fuse is blown. Once the fuse is blown, the wireless transmission and control interlock circuit will completely cut off the power supply of the wireless transmission module, and it cannot be restored by re-powering on. The wireless quick access recorder can only be returned to the factory for repair, and the fuse can be replaced to power the wireless transmission module again.

[0064] Reference Figure 7 , Figure 7The circuit schematic diagram of the first power switch module provided in the embodiment of the present invention, further as an optional implementation mode, the first power switch module includes a main switch tube circuit, a driving tube circuit, an output discharge circuit and an output status monitoring circuit, the driving tube circuit, the output discharge circuit and the output status monitoring circuit are all connected to the main switch tube circuit, the output discharge circuit and the output status monitoring circuit are also connected to the driving tube circuit, the driving tube circuit is used to control the voltage of the main switch tube circuit according to the power on-off signal, the output discharge circuit is used to control the discharge of the main switch tube circuit, the main switch tube circuit is used to control the power supply to be turned on or off, and output a power status signal, and the output status monitoring circuit is used to send the power status signal to the main control board in the wireless quick access recorder.

[0065] Specifically, the first power switch module (i.e., the on-off power switch) is used to turn on or off the input of the +5VDC direct current power supply according to whether the power on-off signal RF_ENA output by the logic unit is high or low. The first power switch module is controlled by the logic unit and is composed of the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and its peripheral circuits. When the power on-off signal RF_ENA is at a high level, the seventh switch tube Q7 is turned on. At this time, the Vgs of the fifth switch tube Q5 reaches the threshold voltage, so that the switch is turned on to power the wireless transmission module. Among them, the main switch tube (i.e., the fifth switch tube Q5) can use an enhanced P-channel MOSFET tube, whose Vgs (th) is a negative voltage. Only when the external power supply is normal (i.e., its source voltage) and Vgs reaches the conduction condition, the main switch tube (i.e., the fifth switch tube Q5) can be turned on. When the front-end circuit fails, the power on-off signal RF_ENA is generally low (output short circuit) or open (high impedance state). At this time, the main switch tube (i.e., the fifth switch tube Q5) is cut off to ensure that the RF circuit power supply will not be accidentally turned on.

[0066] Among them, the main switch tube circuit includes the fifth switch tube Q5, the 42nd capacitor C42, the 43rd capacitor C43, the 18th resistor R18 and the 19th resistor R19. In most cases, the source voltage of the MOS tube of the power load switch will be higher than the gate, so a P-channel enhancement MOS tube is required. The fifth switch tube Q5 is the main switch tube, the 42nd capacitor C42, the 43rd capacitor C43, the 18th resistor R18 and the 19th resistor R19 constitute a surge circuit suppression circuit, which is used to prevent excessive current when the powered-on device is powered on.

[0067] The driving tube circuit includes a seventh switch tube Q7. When the power on / off signal RF_ENA is at a high level, the seventh switch tube Q7 is turned on and the fifth switch tube Q5 is turned on. Conversely, when the power on / off signal RF_ENA is at a low level, the fifth switch tube Q5 is turned off.

[0068] Output discharge circuit: includes the sixth switch tube Q6 and the twentieth resistor R20. When the seventh switch tube Q7 is turned on, the gate voltage of the sixth switch tube Q6 is 0V, and the sixth switch tube Q6 is an N-channel enhancement type MOS tube. Therefore, the seventh switch tube Q7 is turned off at this time, and has no effect on the output of the power on / off control unit. However, when the power on / off signal RF_ENA changes from a high level to a low level, the seventh switch tube Q7 changes from on to off, and its gate voltage rises from 0V to 8V, and changes from off to on. The residual charge in the subsequent circuit and the forty-second capacitor C42 and the forty-third capacitor C43 is quickly released through the twentieth resistor R20.

[0069] Output status monitoring circuit: includes the twenty-first resistor R21, the twenty-second resistor R22 and the forty-fourth capacitor C44. The twenty-first resistor R21 and the twenty-second resistor R22 form a voltage divider network. The nominal output of 8V is 8×0.5=4V, and the power status signal is sent to the main control board.

[0070] Further as an optional implementation, the power on-off control unit also includes a third power switch module, and the output ends of the first power switch module and the second power switch module are both connected to the third power switch module, and the third power switch module is used to turn on the power supply of the wireless transmission module according to the control signal output by the main control board in the wireless quick access recorder.

[0071] Specifically, the third power switch module (i.e., software-controlled on-off power switch), the module implementation scheme adopts an electronic load switch, the difference is that the switch signal does not come from the logic unit, but from the control signal of the main control board. It should be noted that the input of the third power switch module is a 5V power supply after passing through two-stage first power switch modules and two-stage second power switch modules, rather than directly input from the power board. When the input voltage of this module is valid, it can be considered that the passenger aircraft has the conditions to turn on the radio frequency transmission (i.e., wireless transmission). The embodiment of the present invention adds this module to increase flexibility, and realizes on-demand turning on of the radio frequency under the condition that the radio frequency can be turned on, saving traffic and equipment energy consumption. The third power switch module cannot power the wireless transmission module alone, and the power-on control of the wireless transmission module can only be realized when the hardware circuit of the interlocking board determines that the radio frequency can be turned on and the radio frequency interlock is released. The hardware-controlled power switch and the software-controlled power switch are in a logical and relationship, and both need to be valid at the same time to turn on the radio frequency transmission power supply.

[0072] The above is a structural description of the wireless transmission and control interlocking circuit proposed in an embodiment of the present invention. The wireless transmission and control interlocking circuit is mainly composed of a discrete quantity redundant backup unit, a power supply unit, a discrete quantity acquisition interface unit, a logic unit, and a power on / off control unit. Discrete quantity redundant backup unit: redundant backup of external input discrete quantities to prevent damage to a device on the signal path of a discrete quantity input and produce an erroneous decoding result. The discrete quantity input from the rear connector is divided into two in the redundant backup unit, and isolated by exactly the same transistors, and EMC filtering is performed by the same safety capacitor. Power supply unit: converts the +5VDC input from the power board to +3.3VDC. Discrete quantity acquisition interface unit: receives the ground / open discrete signal quantity of the external input and converts it into a voltage signal adapted to the input of the logic unit. Logic unit: generates a corresponding power on / off signal according to the input of the external discrete quantity, and is composed of 74 series logic devices, and does not contain programmable devices inside, so there is no black box in this part of the unit, and its input-output correspondence is clear and unique. Power on / off control unit: The first power switch module (i.e., on / off type power switch) turns on or off the input of +5VDC DC power according to the high or low power on / off signal output by the logic unit. In the normal state, the second power switch module (i.e., fuse type power switch) turns off the fuse MOS, and the input power is normally output to the next stage after passing through the LC filter circuit; when in abnormal conditions, the fuse MOS is turned on, the power output is short-circuited to the ground, and the fuse is blown. Once the fuse is blown, the wireless transmission and control interlock circuit will completely cut off the power supply of the wireless transmission module, and it cannot be restored by re-powering on. The parts can only be returned to the factory for repair, and the fuse can only be replaced to power the wireless transmission module again.

[0073] The structure and working principle of the wireless transmission and control interlocking circuit of the embodiment of the present invention are described above. It can be recognized that compared with the wireless transmission and control interlocking circuit in the traditional wireless fast access recorder, the embodiment of the present invention has the following advantages:

[0074] 1. Use the one-to-two redundant backup method to perform redundant backup on the external input discrete quantity signal, which can effectively reduce the occurrence of erroneous decoding results caused by damage to a device on the signal path of a discrete quantity input;

[0075] Second, multiple sensors use diode isolation input (grounding / open circuit) to prevent reverse current from sensor input, and multiple sensor combinations are used for multiple logic control processing. The logic unit is built by gate circuits and uses a hysteresis circuit of more than 3 volts. The influence of errors is eliminated through system hardware circuit logic and / or redundant, robust or fault-tolerant system design;

[0076] 3. The power input and output are managed by Schmitt comparator and Schmitt trigger, which can effectively ensure the voltage supply range and immediate power-off processing when the power-on timing is abnormal, and the power supply is stable and reliable.

[0077] Reference Figure 8 The embodiment of the present invention provides a control method for a wireless transmission and control interlocking circuit, which is used to control the wireless transmission and control interlocking circuit, and includes the following steps S101 to S104:

[0078] S101, performing redundant backup of external input discrete quantity signals through a discrete quantity redundant backup unit;

[0079] S102, receiving a discrete quantity signal input from outside through a discrete quantity acquisition interface unit, and converting the discrete quantity signal into a voltage signal;

[0080] S103, outputting a power on / off signal through a logic unit according to the voltage signal and a preset wireless transmission condition;

[0081] S104, controlling the power supply of the wireless transmission module according to the power on / off signal through the power on / off control unit;

[0082] Among them, the logic unit does not include programmable devices.

[0083] As an optional implementation, the control method of the wireless transmission and control interlocking circuit further includes the following steps S105:

[0084] S105, converting a first power signal output by a power board in the wireless quick access recorder into a second power signal through a power supply unit, and outputting the second power signal to a power on / off control unit.

[0085] As an optional implementation, the power on / off control unit includes a first power switch module and a second power switch module, and step S104 can be further divided into the following steps S1041 and S1042:

[0086] S1041, controlling the power supply to be turned on or off according to the power on / off signal through the first power switch module;

[0087] S1042: Cut off the power supply line of the wireless transmission module according to a preset abnormal condition through the second power switch module.

[0088] The contents of the above-mentioned wireless transmission and control interlocking circuit embodiments are all applicable to the control method embodiments of the present wireless transmission and control interlocking circuit. The functions specifically implemented by the control method embodiments of the present wireless transmission and control interlocking circuit are the same as those of the above-mentioned wireless transmission and control interlocking circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-mentioned wireless transmission and control interlocking circuit embodiments.

[0089] It should be appreciated that embodiments of the present invention may be implemented or enforced by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The above methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner, according to the methods and drawings described in the specific embodiments. Each program may be implemented in a high-level procedural or object-oriented programming language to communicate with a computer system. However, if desired, the program may be implemented in an assembly or machine language. In any case, the language may be a compiled or interpreted language. In addition, the program may be run on a programmed dedicated integrated circuit for this purpose.

[0090] Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) that is executed collectively on one or more processors, by hardware, or a combination thereof. The computer programs described above include a plurality of instructions that may be executed by one or more processors.

[0091] Further, the above method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optical read and / or write storage medium, a RAM, a ROM, etc., so that it can be read by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the process described herein. In addition, the machine-readable code, or a portion thereof, can be transmitted via a wired or wireless network. When such media includes instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor, the invention described herein includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques described in the present invention, the present invention also includes the computer itself.

[0092] The computer program can be applied to input data to perform the functions described herein, thereby converting the input data to generate output data stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on the display.

[0093] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0095] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A wireless transmission and control interlocking circuit, characterized in that: It includes a discrete quantity redundant backup unit, a discrete quantity acquisition interface unit, a logic unit and a power on / off control unit, wherein the output end of the discrete quantity redundant backup unit is connected to the input end of the discrete quantity acquisition interface unit, the output end of the discrete quantity acquisition interface unit is connected to the input end of the logic unit, the output end of the logic unit is connected to the input end of the power on / off control unit, the discrete quantity redundant backup unit is used to perform redundant backup of externally input discrete quantity signals, the discrete quantity acquisition interface unit is used to receive the externally input discrete quantity signals and convert the discrete quantity signals into voltage signals, the logic unit is used to output a power on / off signal according to the voltage signal and a preset wireless transmission condition, the power on / off control unit is used to control the power supply of the wireless transmission module according to the power on / off signal, wherein the logic unit does not contain a programmable device.

2. A wireless transmission and control interlocking circuit according to claim 1, characterized in that: The wireless transmission and control interlocking circuit also includes a power supply unit, the output end of the power supply unit is connected to the input end of the power on / off control unit, and the power supply unit is used to convert the first power signal output by the power board in the wireless quick access recorder into a second power signal, and output the second power signal to the power on / off control unit.

3. A wireless transmission and control interlocking circuit according to claim 1, characterized in that: The discrete quantity redundant backup unit includes a first transistor, a second transistor, a first capacitor and a second capacitor. The negative electrodes of the first transistor and the second transistor are both connected to the discrete quantity input terminal, the positive electrode of the first transistor is grounded through the first capacitor, and the positive electrode of the second transistor is grounded through the second capacitor. The positive electrodes of the first transistor and the second transistor are also connected to the discrete quantity acquisition interface unit. The first transistor and the second transistor are used to divide the discrete quantity signal into a first discrete quantity signal and a second discrete quantity signal, and perform redundant backup of the first discrete quantity signal and the second discrete quantity signal. The first capacitor is used to filter the first discrete quantity signal, and the second capacitor is used to filter the second discrete quantity signal.

4. A wireless transmission and control interlocking circuit according to claim 1, characterized in that: The logic unit includes an XNOR gate circuit, an OR gate circuit, a first inverter and a second inverter, the first inverter is connected to the XNOR gate circuit, the XNOR gate circuit is connected to the OR gate circuit, the OR gate circuit is connected to the second inverter, the first inverter, the XNOR gate circuit and the OR gate circuit are also connected to the discrete quantity acquisition interface unit, the second inverter is also connected to the power on / off control unit, the XNOR gate circuit, the OR gate circuit, the first inverter and the second inverter are used to output a power on / off signal according to the voltage signal and the wireless transmission condition.

5. A wireless transmission and control interlocking circuit according to claim 2, characterized in that: The power on-off control unit includes a first power switch module and a second power switch module. The output ends of the logic unit and the power supply unit are connected to the input end of the first power switch module, and the output end of the first power switch module is connected to the second power switch module. The first power switch module is used to control the power supply of the wireless transmission module to be turned on or off according to the power on-off signal, and the second power switch module is used to cut off the power supply line of the wireless transmission module according to a preset abnormal condition.

6. A wireless transmission and control interlocking circuit according to claim 5, characterized in that: The first power switch module includes a main switch tube circuit, a driving tube circuit, an output discharge circuit and an output status monitoring circuit. The driving tube circuit, the output discharge circuit and the output status monitoring circuit are all connected to the main switch tube circuit. The output discharge circuit and the output status monitoring circuit are also connected to the driving tube circuit. The driving tube circuit is used to control the voltage of the main switch tube circuit according to the power on-off signal. The output discharge circuit is used to control the discharge of the main switch tube circuit. The main switch tube circuit is used to control the power supply to be turned on or off and output a power status signal. The output status monitoring circuit is used to send the power status signal to the main control board in the wireless quick access recorder.

7. A wireless transmission and control interlocking circuit according to claim 5, characterized in that: The power on-off control unit also includes a third power switch module, and the output ends of the first power switch module and the second power switch module are both connected to the third power switch module. The third power switch module is used to turn on the power supply of the wireless transmission module according to the control signal output by the main control board in the wireless quick access recorder.

8. A control method for a wireless transmission and control interlocking circuit, used for controlling the wireless transmission and control interlocking circuit according to any one of claims 1 to 7, characterized in that: The following steps are involved: The discrete quantity redundant backup unit is used to perform redundant backup of the external input discrete quantity signal; Receive the discrete quantity signal input from the outside through the discrete quantity acquisition interface unit, and convert the discrete quantity signal into a voltage signal; Outputting a power on / off signal according to the voltage signal and a preset wireless transmission condition through a logic unit; Controlling the power supply of the wireless transmission module according to the power on / off signal through the power on / off control unit; Wherein, the logic unit does not include a programmable device.

9. A control method for a wireless transmission and control interlocking circuit according to claim 8, characterized in that: The control method further comprises: The first power signal output by the power board in the wireless quick access recorder is converted into a second power signal by the power supply unit, and the second power signal is output to the power on / off control unit.

10. A control method for a wireless transmission and control interlocking circuit according to claim 8, characterized in that: The power on / off control unit includes a first power switch module and a second power switch module, and the power on / off control unit controls the power supply of the wireless transmission module according to the power on / off signal, specifically including: Controlling the power supply to be turned on or off according to the power on / off signal by the first power switch module; The second power switch module cuts off the power supply line of the wireless transmission module according to a preset abnormal condition.

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