CN106533216B - Onboard airport wireless communication equipment power supply based on onboard equipment power supply - Google Patents
Onboard airport wireless communication equipment power supply based on onboard equipment power supply Download PDFInfo
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- CN106533216B CN106533216B CN201611216367.2A CN201611216367A CN106533216B CN 106533216 B CN106533216 B CN 106533216B CN 201611216367 A CN201611216367 A CN 201611216367A CN 106533216 B CN106533216 B CN 106533216B
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
Abstract
The invention discloses an airborne airport wireless communication equipment power supply based on an on-vehicle equipment power supply, which comprises an input connector, an input filtering and lightning protection device, an AC-DC module, a DC-DC module, an output filtering device, an output connector, a discrete quantity control module and a slow charge and fast discharge circuit module which are connected in sequence; the discrete quantity control module is provided with two input ends and two output ends, the two input ends of the discrete quantity control module are respectively connected with the output connector and the AC-DC module, and the two output ends are respectively connected with the DC-DC module and the output connector; the slow charge and fast discharge circuit module is provided with an input end and an output end, and the input end and the output end of the slow charge and fast discharge circuit module are respectively connected with the output end of the AC-DC module and the input end of the DC-DC module. The invention can use the vehicle-mounted power supply in the special power supply of the wireless communication equipment of the airborne airport by introducing the discrete quantity control module and the slow charge and fast discharge circuit module.
Description
Technical Field
The invention relates to a power supply, in particular to an airborne airport wireless communication equipment power supply based on an onboard equipment power supply.
Background
Fig. 1 is a power scheme of a mature vehicle-mounted device, where the power device includes an input connector (for connecting an input power source), an input filtering and lightning protection device, an AC-DC module (M3), a DC-DC module (M4), an output filtering device, and an output connector (for connecting a load), where an input power enable pin is disposed in the input connector, and the input power enable pin is used for directly controlling on-off of the DC-DC module (M4). Due to the limitation of weight and space, the input filtering and lightning protection device and the output filtering device adopted in the vehicle-mounted equipment power supply have small volume and light weight, and have excellent noise and lightning inhibition performance. The main power conversion circuit adopts a high-power-density small modularized AC-DC and DC-DC module power converter which can convert an input power supply into low-voltage direct current output for an internal computer of the vehicle-mounted equipment, and a main power supply enabling pin on a main power module (AC-DC module (M3)) can directly control the output of the main power module. The power supply is stable in operation, excellent in performance and very suitable for being transplanted into a special power supply of an airborne airport wireless communication device, wherein the airport wireless communication device is cabin system equipment working when an airplane is in a ground state, and a power supply circuit of the device needs to bear an embedded computer as a load.
However, the onboard power supply is different from the locomotive onboard power supply, and the following defects exist when the onboard power supply is directly transplanted into a power supply special for the wireless communication equipment of an onboard airport:
1. the AC input required by the onboard power supply is 115VAC/360-800HZ, and the AC-DC modularized power supply converter of the onboard equipment power supply cannot meet the input requirement;
2. when the pilot dials the operation panel switch to open the airport wireless communication equipment to operate, the switch is toggled to close the equipment during take-off, and software on a load (hereinafter referred to as software) needs to store some key equipment operation parameters during switch closing. The vehicle-mounted power supply has the advantages that although the enabling control switch signal is used for controlling the power supply to output, the signal output is not used for triggering the software storage data of the load, if the load is introduced into the detection circuit to actively detect the abnormal input voltage of the load and then trigger the method for storing the data of the software, on one hand, the detection effect is unreliable due to the normal fluctuation of the voltage, and in addition, even if abnormal voltage is detected, the time for triggering the software storage is far insufficient;
3. the standard DO-160G of the civil aircraft prescribes that the power supply of the equipment is interrupted for 200ms, the equipment can work normally, the power supply of the vehicle-mounted equipment has no energy storage function, the requirements are not met, and the conventional energy storage circuit is based on the principle of charging and discharging of a capacitor: the charging circuit controls the energy storage capacitor to store energy online, and after input is interrupted, the circuit controls the energy storage capacitor to release the energy of the capacitor to the load. The energy storage capacitor has a huge capacity, and because of the existence of the energy storage capacitor, transient current impact is introduced to a power supply input line in the process of charging the capacitor, and even when a plurality of devices are simultaneously opened, the current impact is multiplied on the power supply line. Such power surges can easily cause other equipment in the cabin system to fail, causing system dysfunction. The civil aircraft standard DO-160G specifies that the current surge on the power of the equipment must meet the following conditions: namely, the peak value of the input surge current of 0 to 3ms is 9 times of the stable working current, the peak value of the input surge current of 3ms to 500ms is 4 times of the stable working current, and the peak value of the input surge current of 500ms to 2s is 2 times of the stable working current. Therefore, to meet the DO-160G requirements, conventional tank circuits need to be modified;
4. the load software also saves the device operating parameters due to no signal trigger in the event of an interruption or direct loss of the main power module (AC-DC module) input.
Disclosure of Invention
The invention aims to overcome the defect that in the prior art, a vehicle-mounted power supply is directly transplanted to a power supply special for an airborne airport wireless communication device, and provides the power supply of the airborne airport wireless communication device based on the vehicle-mounted power supply.
The invention is realized by the following technical scheme:
the power supply of the airborne airport wireless communication equipment based on the power supply of the vehicle-mounted equipment comprises an input connector, an input filtering and lightning protection device, an AC-DC module, a DC-DC module, an output filtering device, an output connector, a discrete quantity control module and a slow charge and fast discharge circuit module which are connected in sequence; the discrete quantity control module is used for receiving and processing signals sent by the output connector and then sending the processed signals to the DC-DC module; the discrete quantity control module is also used for receiving and processing signals sent by the AC-DC module and then sending the processed signals to the output connector; the slow charge and fast discharge circuit module is used for charging and storing electric energy when the AC-DC module is electrified and releasing the electric energy when the AC-DC module is powered off; the discrete quantity control module is provided with a first input end, a second input end, a first output end and a second output end, the first input end and the second input end of the discrete quantity control module are respectively connected with the output connector and the AC-DC module, and the first output end and the second output end of the discrete quantity control module are respectively connected with the DC-DC module and the output connector; the slow charge and fast discharge circuit module is provided with an input end and an output end, and the input end and the output end of the slow charge and fast discharge circuit module are respectively connected with the output end of the AC-DC module and the input end of the DC-DC module. When the invention is used, the input connector is externally connected with 115V alternating current power supply, the output connector is externally connected with an embedded computer as a load, and the 115V alternating current power supply is reduced in voltage by the AC-DC module and the DC-DC module for safety because the voltage of the power supply externally connected with the input connector is higher, so that the output connector works under lower voltage. In the whole process, the output connector and the AC-DC module together control the discrete quantity control module: the pilot cuts off the power supply to the load by cutting off a switch connected with the output connector, namely when the pilot gives an action of cutting off the switch, a first input end (connected with the output connector) of the discrete quantity control module obtains a control signal from the output connector, the control signal controls a first output end of the discrete quantity control module to output a delayed control signal to control the closing of the DC-DC module, a second input end obtains a control signal from the AC-DC module, a second output end of the control signal controls the discrete quantity control module to output a control signal to control the output connector to output a trigger signal, the trigger signal is used for triggering the operation parameters of the load storage equipment, and the time of the discrete quantity control module for sending the control signal to the DC-DC module is later than the time of the discrete quantity control module for sending the control signal to the output connector, and the difference value between the two times is the effective time of the operation parameters of the load storage equipment; the slow charge and fast discharge circuit module is introduced, so that transient current impact on a power supply input line in the power-on and charge process of the slow charge and fast discharge circuit can be effectively reduced, and the system function abnormality caused by other equipment failure in a passenger cabin system due to the power impact is avoided.
Further, the output connector is provided with a first enabling pin and a signal triggering pin, the AC-DC module is externally connected with an enabling circuit module, the output end of the enabling circuit module is used as a second enabling pin, the DC-DC module is provided with a third enabling pin, the discrete quantity control module is provided with a first input end and a second input end of the discrete quantity control module, which are respectively connected with the first enabling pin and the second enabling pin, and a first output end and a second output end of the discrete quantity control module are respectively connected with the third enabling pin and the signal triggering pin.
Further, the discrete quantity control module comprises an initial power input state detection and driving circuit and an intermediate power input state detection and driving circuit. The initial power input state detection and driving circuit is used for detecting an external power supply closing signal given by the output connector and sending a delayed control signal to control the closing of the DC-DC module; the intermediate power input state detection and driving circuit is used for detecting a power-off signal of the AC-DC module and sending a delayed control signal to control the output connector, so that the output connector outputs a trigger signal, and the trigger signal is used for triggering the operation parameters of the load storage equipment; the delay time of the initial power input state detection and driving circuit is longer than that of the intermediate power input state detection and driving circuit, and the difference value of the two delay times is the effective time of the operation parameters of the load storage equipment.
Further, the initial power input state detection and driving circuit comprises a power supply, a voltage comparator, a signal blocker, a first diode, a second diode and a first MOS tube, wherein the model of the voltage comparator IS LM239DTBR2G, the model of the signal blocker IS LTC6994IS6-2, the negative electrode of the first diode IS used as the first input end of the discrete quantity control module, and the drain electrode of the first MOS tube IS used as the first output end of the discrete quantity control module; the twelfth pin of the voltage comparator is grounded, the fourth pin and the fifth pin of the voltage comparator are respectively grounded through a second capacitor and a first capacitor, the power supply is grounded through a third resistor and a fourth resistor which are sequentially connected in series, the fourth pin of the voltage comparator is also connected to a circuit connected with the third resistor and the fourth resistor, a second resistor is connected between the positive electrode of the first diode and the other end of the first capacitor which is grounded relatively, and a first resistor is connected between the positive electrode of the first diode and the power supply; the third pin of the voltage comparator is connected with a power supply, and is grounded through a third capacitor; the second pin of the voltage comparator is connected with the fifth pin of the voltage comparator through a sixth resistor and a fifth resistor which are sequentially connected in series; the second pin of the signal blocker is grounded, the third pin of the signal blocker is grounded through a ninth resistor, a seventh resistor is connected in series between the first pin of the signal blocker and the power supply, the first pin of the signal blocker is also connected to a circuit connected with the fifth resistor and the sixth resistor, and the first pin of the signal blocker is grounded through the eighth resistor; the sixth pin of the signal blocker is connected with the grid electrode of the first MOS tube through a twelfth resistor, the fifth pin of the signal blocker is connected with an external power supply of 5.1V, the fifth pin of the signal blocker is connected with the source electrode of the first MOS tube through a tenth resistor and an eleventh resistor which are sequentially connected in series, a fourth capacitor is further connected between the fifth pin of the signal blocker and the source electrode of the first MOS tube, the fourth pin of the signal blocker is connected to a circuit connected with the tenth resistor and the eleventh resistor, the source electrode of the first MOS tube is grounded, the drain electrode of the first MOS tube is grounded through the thirteenth resistor, a fourteenth resistor is connected between the drain electrode of the first MOS tube and the power supply, a fifteenth resistor is connected between one end of the fourteenth resistor connected with the power supply and the cathode of the second diode, the cathode of the second diode is connected with the external power supply of 5.1V, and the anode of the second diode is grounded. The signal blocker adopted by the invention is a square wave blocking output chip, the chip has wide temperature application range, excellent performance and small volume, and comprises six pins, the first pin (IN pin) of the chip can trigger the counter of the AD converter IN the chip to start to count down according to the edge (comprising rising edge and falling edge) of an input waveform, and when the count down is 0, the output waveform starts to turn over along with the edge of the input waveform, so that the delay of the whole waveform is realized; the invention can SET the corresponding counter initial value as 327678, the SET pin keeps 1V voltage drop to the ground, the SET pin is grounded through a ninth resistor, the oscillation frequency of the internal timer is SET as 6.6us, the resistance of the corresponding ninth resistor is 330KΩ, so the time of the output enabling switch signal edge lagging the input signal edge is 6.6us× 327678 = 216.268ms, and the delay time requirement specified by the civil aircraft standard DO-160G is met; in addition, the voltage comparator adopted by the invention has a hysteresis function, the delay time from the power-off signal of the output connector received by the initial power input state detection and driving circuit to the control signal sent by the DC-DC module is necessarily larger than 216.268ms, in actual operation, the falling edge of the output waveform is observed to lag behind the falling edge of the input waveform by the oscilloscope, the falling edge is slightly deviated from a theoretical calculation value, after the initial power input state detection and driving circuit is introduced, when the signal of a switch given by a pilot arrives, the DC-DC module can be effectively turned off after 200ms, thereby achieving the purpose of delaying to turn off an external power supply; the initial power input state detection and driving circuit uses a first path of comparator of a voltage comparator (comprising four paths of comparators), a forward end (a fifth pin of the voltage comparator) of the first path of comparator is connected with an enabling pin (a first enabling pin) of an output connector, a signal sent by the first enabling pin is used as a detection signal (voltage signal), a reverse end (a fourth pin of the voltage comparator) sets a threshold action voltage to be 8V through resistor voltage division, and a deep negative feedback method is adopted to reduce the gain of an amplifier and stabilize output.
Further, the intermediate power input state detection and driving circuit comprises a power supply, a third diode, a second MOS tube and a sixteenth resistor, one end of the sixteenth resistor is used as a second input end of the discrete quantity control module, and the positive electrode of the third diode is used as a second output end of the discrete quantity control module; the sixth pin of the voltage comparator is connected with the fourth pin of the voltage comparator, the seventh pin of the voltage comparator is connected with the sixteenth resistor as the other end of the second output end of the discrete quantity control module, a seventeenth resistor is connected between the first pin of the voltage comparator and the seventh pin, the first pin of the voltage comparator is connected with the grid electrode of the second MOS tube through an eighteenth resistor, the grid electrode of the second MOS tube is grounded through a twentieth resistor, a nineteenth resistor is connected between the other end of the twentieth resistor which is grounded relatively to the power supply, the source electrode of the second MOS tube is grounded, the drain electrode of the second MOS tube is connected with the power supply through a twenty first resistor, and the drain electrode of the second MOS tube is connected with the anode of the third diode. The intermediate power input state detection and driving circuit uses a second path of comparator of the voltage comparator, the positive end (the seventh pin of the voltage comparator) of the second path of comparator is connected with an enabling control signal of the AC-DC module as a detection signal (voltage signal) through a sixteenth resistor in series, the reverse end (the sixth pin of the voltage comparator) of the second path of comparator is connected with the reverse end (the fourth pin of the voltage comparator) of the first path of comparator so as to set the threshold action voltage to be 8V, and the gain of the amplifier is reduced and the output is stabilized by adopting a deep negative feedback method; the output end of the intermediate power input state detection and driving circuit can be accurately matched with the discrete quantity electrical characteristics of the load hardware circuit according to the requirement, the second MOS tube is connected in series with the third diode to realize isolation, and the load end can be used by connecting a proper pull-up resistor to the power supply according to the input level of the load end.
Further, the slow charge-fast discharge circuit module comprises six capacitors connected in parallel, four resistors connected in parallel, a fourth diode, a fifth diode, a sixth diode, a seventh diode and an eleventh capacitor, the six capacitors connected in parallel are respectively a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor, one end of the tenth capacitor is grounded, the four resistors connected in parallel are respectively a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor and a twenty-fifth resistor, one end of the twenty-second resistor is connected with the other end of the tenth capacitor which is grounded relatively, the other end of the twenty-second resistor is connected with the positive electrode of the fourth diode, the negative electrode of the fourth diode is simultaneously connected with the negative electrode of the fifth diode, the positive electrode of the sixth diode and the positive electrode of the seventh diode, the positive electrode of the fifth diode is connected with the positive electrode of the fourth diode, the negative electrode of the sixth diode is connected with the negative electrode of the seventh diode, the negative electrode of the seventh diode is grounded relatively to the other end of the tenth capacitor, and the other end of the seventh diode is connected with the negative electrode of the seventh capacitor as the slow charge-fast discharge circuit module; the eleventh capacitor is an electrolytic capacitor, the positive electrode of the eleventh capacitor is connected with the negative electrode of the fifth diode, and the negative electrode of the eleventh capacitor is grounded. The fourth diode, the fifth diode, the sixth diode and the seventh diode which are connected in series in the front-back direction are used for controlling the current direction, the twenty-first resistor, the twenty-second resistor, the twenty-third resistor and the twenty-fourth resistor which are connected in parallel are used for restraining the peak value of the impact current to a reasonable range, the table 1 is test data made by using the power supplies of the wireless communication system equipment with two different frequencies, and the peak value current waveform peak value in the average value column is smaller than the steady-state current multiple value in a bracket, so that the slow charge open circuit can effectively restrain the current impact value within the horizontal range specified by DO-160G.
TABLE 1
Further, the model of the AC-DC module is HGMB-35-W-17, an eighth pin of the AC-DC module is used as an output end of the AC-DC module, a fifth pin of the AC-DC module is grounded, and a sixth pin of the AC-DC module is connected with a seventh pin; the external enabling circuit module of the AC-DC module comprises a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor and an eighth diode, wherein the twenty-sixth resistor and the twenty-seventh resistor are connected in parallel, one end of the twenty-sixth resistor is connected with a sixth pin of the AC-DC module, the other end of the twenty-sixth resistor is connected with the negative electrode of the eighth diode, the positive electrode of the eighth diode is grounded, the twenty-eighth resistor is connected with the eighth diode in parallel, and the negative electrode of the eighth diode is used as the output end of the enabling circuit module. The invention adopts HGMB-35-W-17 as an AC-DC module, the power module meets the input requirement of the onboard power supply alternating current, the input voltage is adapted to the wide-voltage broadband input of 95V-145VAC/360-800HZ, the output voltage is 34V, and the invention is mature to be applied to the main power converter of the equipment power supply of the air-passenger aircraft, and has high reliability and excellent performance.
Further, the model of the DC-DC module is LTM8027EV#PBF, and the A4 pin of the DC-DC module is used as a third enabling pin.
Further, the model of the output connector is DMP 3-7W 2P-193, the fifth pin of the output connector is used as a first enabling pin, and the third pin of the output connector is used as a signal triggering pin.
Compared with the prior art, the invention has the following advantages and beneficial effects: 1. the invention can transplant the vehicle-mounted power supply into the special power supply of the wireless communication equipment of the airborne airport by introducing the discrete quantity control module and the slow charge and fast discharge circuit module; 2. the introduced discrete quantity control module comprises an initial power input state detection and driving circuit and an intermediate power input state detection and driving circuit, wherein the initial power input state detection and driving circuit can delay the power-off time of the DC-DC module, and the intermediate power input state detection and driving circuit can provide a trigger signal for an output connector in time to prompt a load to save equipment operation data, so that the load is ensured to finish saving the equipment operation data in the delayed power-off time; 3. the introduced slow charge and fast discharge circuit module can effectively inhibit the peak value of the impact current in the charge and discharge process, thereby avoiding the failure of other equipment in a passenger cabin system and avoiding the abnormal function of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
fig. 1 is a schematic diagram of a power supply structure of an in-vehicle apparatus.
FIG. 2 is a schematic diagram of the structure of the present invention.
FIG. 3 is a schematic diagram of an initial power input state detection and driving circuit.
Fig. 4is a schematic diagram of an intermediate power input state detection and driving circuit.
Fig. 5 is a schematic circuit diagram of the discrete quantity control module.
Fig. 6 is a schematic circuit diagram of an enabling circuit module and a slow charge-fast discharge circuit module externally connected with an AC-DC module.
In the drawings, the reference numerals and corresponding part names:
m1-voltage comparator, M2-signal blocker, M3-AC-DC module, M4-DC module, VT 1-first MOS tube, VT 2-second MOS tube, vcc-power supply, D1-first diode, D2-second diode, D3-third diode, D4-fourth diode, D5-fifth diode, D6-first sixth diode, D7-seventh diode, D8-eighth diode, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, R7-seventh resistor, R8-eighth resistor, R9-ninth resistor, R10-tenth resistor, R11-eleventh resistor, R12-twelfth resistor, R13-thirteenth resistor, R14-fourteenth resistor, R15-fifteenth resistor, R16-sixteenth resistor, R17-seventeenth resistor, R18-eighteenth resistor, R19-nineteenth resistor, R20-twentieth resistor, R21-twenty-first resistor, R22-twenty-second resistor, R23-twenty-third resistor, R24-twenty-fourth resistor, R25-twenty-fifth resistor, R26-twenty-sixth resistor, R27-twenty-seventh resistor, R28-twenty-eighth resistor, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, C7-seventh capacitor, C8-eighth capacitor, C9-ninth capacitor, C10-tenth capacitor, C11-eleventh capacitor.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 2, the embodiment provides an airborne airport wireless communication equipment power supply based on an onboard equipment power supply, which comprises an input connector, an input filtering and lightning protection device, an AC-DC module M3, a DC-DC module M4, an output filtering device, an output connector, a discrete quantity control module and a slow charge-fast discharge circuit module, wherein the input connector, the input filtering and lightning protection device, the AC-DC module M3, the DC-DC module M4, the output filtering device and the output connector are sequentially connected; the discrete quantity control module is used for receiving and processing signals sent by the output connector and then sending the processed signals to the DC-DC module M4; the discrete quantity control module is also used for receiving and processing signals sent by the AC-DC module M3 and then sending the processed signals to the output connector; the slow charge and fast discharge circuit module is used for charging and storing electric energy when the AC-DC module M3 is electrified and releasing the electric energy when the AC-DC module M3 is powered off;
the output connector is provided with a first enabling pin and a signal triggering pin, the AC-DC module M3 is externally connected with an enabling circuit module, the output end of the enabling circuit module is used as a second enabling pin, the DC-DC module M4 is provided with a third enabling pin, the discrete quantity control module is provided with a first input end, a second input end, a first output end and a second output end, the first input end and the second input end of the discrete quantity control module are respectively connected with the first enabling pin and the second enabling pin, and the first output end and the second output end of the discrete quantity control module are respectively connected with the third enabling pin and the signal triggering pin; the slow charge and fast discharge circuit module is provided with an input end and an output end, and the input end and the output end of the slow charge and fast discharge circuit module are respectively connected with the output end of the AC-DC module M3 and the input end of the DC-DC module M4.
In addition, the discrete quantity control module comprises an initial power input state detection and driving circuit and an intermediate power input state detection and driving circuit; as shown in fig. 3, the initial power input state detecting and driving circuit includes a power supply Vcc, a voltage comparator M1, a signal blocker M2, a first diode D1, a second diode D2 and a first MOS transistor VT1, the voltage comparator M1 IS model LM239DTBR2G, the signal blocker M2 IS model LTC6994IS6-2, the negative electrode of the first diode D1 IS used as the first input end of the discrete quantity control module, the drain electrode of the first MOS transistor VT1 IS used as the first output end of the discrete quantity control module, the twelfth pin of the voltage comparator M1 IS grounded, the fourth pin and the fifth pin of the voltage comparator M1 are respectively grounded through a second capacitor C2 and a first capacitor C1, the power supply Vcc IS grounded through a third resistor R3 and a fourth resistor R4 which are sequentially connected in series, the fourth pin of the voltage comparator M1 IS also connected to the line connecting the third resistor R3 and the fourth resistor R4, a second resistor R2 IS connected between the positive electrode of the first diode D1 and the other end of the first capacitor C1, which IS grounded, opposite to the first capacitor C1, a first resistor R1 IS connected between the positive electrode of the first diode D1 and the power supply Vcc, a third pin of the voltage comparator M1 IS connected with the power supply Vcc, the third pin of the voltage comparator M1 IS grounded through a third capacitor C3, a second pin of the voltage comparator M1 IS connected with a fifth pin of the voltage comparator M1 through a sixth resistor R6 and a fifth resistor R5 which are sequentially connected in series, a second pin of the signal blocker M2 IS grounded through a ninth resistor R9, a seventh resistor R7 IS connected between the first pin of the signal blocker M2 and the power supply Vcc, the first pin of the signal blocker M2 IS also connected on a line connected with the fifth resistor R5 and the sixth resistor R6, the first pin of the signal blocker M2 IS grounded through an eighth resistor R8, the sixth pin of the signal blocker M2 is connected with the grid electrode of the first MOS tube VT1 through a twelfth resistor R12, the fifth pin of the signal blocker M2 is connected with an external power supply of 5.1V, the fifth pin of the signal blocker M2 is connected with the source electrode of the first MOS tube VT1 through a tenth resistor R10 and an eleventh resistor R11 which are sequentially connected in series, a fourth capacitor C4 is further connected between the fifth pin of the signal blocker M2 and the source electrode of the first MOS tube VT1, the fourth pin of the signal blocker M2 is connected on a circuit connected with the tenth resistor R10 and the eleventh resistor R11, the source electrode of the first MOS tube VT1 is grounded, the drain electrode of the first MOS tube VT1 is grounded through a thirteenth resistor R13, a fourteenth resistor R14 is connected between the drain electrode of the first MOS tube VT1 and the power supply Vcc, a fifteenth resistor R15 is connected between one end of the fourteenth resistor R14 connected with the power supply Vcc and the negative electrode of the second diode D2, the negative electrode of the second diode D2 is connected with the power supply of 5.1V, and the positive electrode of the second diode D2 is grounded.
As shown in fig. 4, the intermediate power input state detecting and driving circuit includes a power source Vcc, a third diode D3, a second MOS transistor VT2, and a sixteenth resistor R16, one end of the sixteenth resistor R16 is used as a second input end of the discrete quantity control module, and an anode of the third diode D3 is used as a second output end of the discrete quantity control module; the sixth pin of the voltage comparator M1 is connected with the fourth pin of the voltage comparator M1, the seventh pin of the voltage comparator M1 is connected with the other end of the sixteenth resistor R16 serving as the second input end of the discrete quantity control module, a seventeenth resistor R17 is connected between the first pin and the seventh pin of the voltage comparator M1, the first pin of the voltage comparator M1 is connected with the grid of the second MOS tube VT2 through an eighteenth resistor R18, the grid of the second MOS tube VT2 is grounded through a twentieth resistor R20, a nineteenth resistor R19 is connected between the other end of the twentieth resistor R20 which is grounded relatively to the power supply Vcc, the source of the second MOS tube VT2 is grounded, the drain of the second MOS tube VT2 is connected with the power supply Vcc through a twenty first resistor R21, and the drain of the second MOS tube VT2 is connected with the positive electrode of the third diode D3.
Fig. 5 is a schematic circuit diagram of a discrete quantity control module, which includes an initial power input state detection and driving circuit and an intermediate power input state detection and driving circuit.
As shown in fig. 6, the slow charge-fast discharge circuit module includes six capacitors connected in parallel, four resistors connected in parallel, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eleventh capacitor C11, the six capacitors connected in parallel are respectively a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10, one end of the tenth capacitor C10 is grounded, the four resistors connected in parallel are respectively a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24 and a twenty-fifth resistor R25, one end of the twenty-second resistor R22 is connected with the other end of the tenth capacitor C10, which is relatively grounded, the other end of the twenty-second resistor R22 is connected with the positive electrode of the fourth diode D4, the negative electrode of the fourth diode D4 is simultaneously connected with the positive electrode of the fifth diode D5 and the negative electrode of the seventh diode D6, the positive electrode of the seventh diode D6 is relatively grounded, the positive electrode of the fifth diode D7 is connected with the negative electrode of the seventh diode D7, the positive electrode of the fifth diode D7 is relatively grounded, the negative electrode of the fifth diode D7 is connected with the negative electrode of the fifth diode D7 is relatively grounded, and the other end of the negative diode D7 is connected with the negative electrode of the negative diode D7 is connected with the negative end of the negative diode D7, and the negative end of the negative diode D7 is connected as the slow charge-fast discharge module is connected with the negative end of the negative diode D7; the eleventh capacitor C11 is an electrolytic capacitor, an anode of the eleventh capacitor C11 is connected to a cathode of the fifth diode D5, a cathode of the eleventh capacitor C11 is grounded, and the eleventh capacitor C11 further includes two fixing pins for fixing the eleventh capacitor C11 on the circuit board.
As shown in fig. 6, the model of the AC-DC module M3 is HGMB-35-W-17, the eighth pin of the AC-DC module M3 is used as the output end of the AC-DC module M3, the fifth pin of the AC-DC module M3 is grounded, and the sixth pin of the AC-DC module M3 is connected with the seventh pin; the external enabling circuit module of the AC-DC module M3 comprises a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28 and an eighth diode D8, wherein the twenty-sixth resistor R26 and the twenty-seventh resistor R27 are connected in parallel, one end of the twenty-sixth resistor R26 is connected with a sixth pin of the AC-DC module M3, the other end of the twenty-sixth resistor R26 is connected with a negative electrode of the eighth diode D8, an anode of the eighth diode D8 is grounded, the twenty-eighth resistor R28 is connected with the eighth diode D8 in parallel, and a negative electrode of the eighth diode D8 serves as an output end of the enabling circuit module.
In addition, in this embodiment, the model of the DC-DC module M4 is LTM8027ev#pbf, the A4 pin of the DC-DC module M4 is used as the third enable pin, the power Vcc may be provided by the output terminal of the AC-DC module M3, the model of the output connector is DMP 3-7W 2P-193, the fifth pin of the output connector is used as the first enable pin, and the third pin of the output connector is used as the signal trigger pin.
The signal blocker M2 adopted IN the embodiment is a square wave blocking output chip, the chip has wide temperature application range, excellent performance and small volume, and comprises six pins, the first pin (IN pin) of the chip can trigger the counter of the internal AD converter of the chip to start counting down according to the edge (including rising edge and falling edge) of the input waveform, and when the counting down is 0, the output waveform starts to turn over along with the edge of the input waveform, so that the delay of the waveform as a whole is realized; the reasonable input voltage distribution ratio is provided for the fourth pin (DIV pin) of the signal blocker M2 so as to SET the initial value of the AD converter counter in the chip, the corresponding initial value of the counter can be SET to 327678, the SET pin keeps 1V voltage drop to the ground, the SET pin is grounded through a ninth resistor R9, the oscillation frequency of the internal timer is SET to be 6.6us, and the resistance value of the corresponding ninth resistor R9 is 330KΩ, so that the time of the output enabling switch signal along the lagging input signal edge is 6.6us× 327678 = 216.268ms, and the delay time requirement specified by the standard DO-160G of the civil aircraft is met; in addition, the voltage comparator M1 adopted in this embodiment has a hysteresis function, and the delay time from the initial power input state detection and driving circuit receiving the power-off signal of the output connector to sending the control signal to the DC-DC module M4 is necessarily longer than 216.268ms, in actual operation, the oscilloscope can observe that the falling edge of the output waveform lags behind the falling edge of the input waveform by 228ms, and has little deviation from the theoretical calculation value, after the initial power input state detection and driving circuit is introduced, when the signal of the switch given by the pilot arrives, the DC-DC module M4 can be effectively turned off after 200ms, thereby achieving the purpose of delaying to turn off the external power supply.
When the embodiment is implemented, the input connector is externally connected with a 115V alternating current power supply, the output connector is externally connected with an embedded computer as a load, the 115V alternating current power supply is reduced by the AC-DC module M3 and the DC-DC module M4, the working voltage of the output connector is lower, for safety, a pilot cuts off power supply to the load by cutting off the output connector, when the pilot gives an action of cutting off a switch, a first input end (connected with the output connector) of the discrete quantity control module obtains a control signal from the output connector, the control signal controls a first output end of the discrete quantity control module to output a delayed control signal for controlling the closing of the DC-DC module M4, a second input end of the discrete quantity control module obtains a control signal from the AC-DC module M3, the control signal controls a second output end of the discrete quantity control module to output the output connector to output a trigger signal, the trigger signal is used for triggering the load to save the operating parameters of equipment, and in the whole process, the output connector and the first output end of the discrete quantity control module and the second input end of the discrete quantity control module output a control signal from the AC-DC module M3 to output a trigger signal for the time difference value of the time control signal to the discrete quantity control module, and the time of the discrete quantity control module to output the time control signal to the discrete quantity control module; the slow charge and fast discharge circuit module is introduced, so that transient current impact on a power supply input line in the power-on and charge process of the slow charge and fast discharge circuit can be effectively reduced, and the system function abnormality caused by other equipment failure in a passenger cabin system due to the power impact is avoided.
Example 2
Based on embodiment 1, in this embodiment, the first MOS transistor VT1 and the second MOS transistor VT2 are both of the type BSS123LT1G, the first diode D1 and the third diode D3 are both of the type BAT 46W-E3/HE 3, the second diode D2 is of the type BZG C5V1, the fourth diode D4, the fifth diode D5, the sixth diode D6 and the seventh diode D7 are both schottky diodes and are of the type 1N5818, the eighth diode D8 is of the type BZG C12, the resistance of the first resistor R1 is 100kΩ, the resistance of the second resistor R2 is 1.07kΩ, the resistance of the third resistor R3 is 100kΩ, the resistance of the fourth resistor R4 is 32.4kΩ, the resistance of the fifth resistor R5 is 1.2M Ω, the resistance of the sixth resistor R6 is 100 Ω, the resistance of the seventh resistor R7 is 7.5kΩ, the resistance of the eighth resistor R9 is the resistance of the eleventh resistor 11, the resistance of the eighth resistor R9 is the eighth resistor R9, the resistance of the twelfth resistor R12 is 100deg.OMEGA, the resistance of the thirteenth resistor R13 is 82KOMEGA, the resistance of the fourteenth resistor R14 is 150KOMEGA, the resistance of the fifteenth resistor R15 is 2.7 KOMEGA, the resistance of the sixteenth resistor R16 is 1.07 KOMEGA, the resistance of the seventeenth resistor R17 is 1.2 MOMEGA, the resistance of the eighteenth resistor R18 is 100deg.OMEGA, the resistance of the nineteenth resistor R19 is 20KOMEGA, the resistance of the twenty-first resistor R20 is 10KOMEGA, the resistance of the twenty-first resistor R21 is 20KOMEGA, the resistance of each of the twenty-second resistor R22, the twenty-third resistor R23, the twenty-fourth resistor R24 and the twenty-fifth resistor R25 is 150OMEGA, the twenty-sixth resistor R26, the twenty-seventh resistor R27 and the twenty-eighth resistor R28 is 220OMEGA, the value of the first capacitor C1 is 0.1uF, the value of the second capacitor C2 is 0.1uF, the value of the third capacitor C3 is the fourth capacitor C1 is the sixth capacitor C4 is the sixth capacitor C1.0.6F 1, the value of the fifth capacitor C1 is the sixth capacitor C4 is the sixth capacitor 1.6F 1, the seventh capacitor C7 has a value of 4.7uF, the eighth capacitor C8 has a value of 4.7uF, the ninth capacitor C9 has a value of 22uF, the tenth capacitor C10 has a value of 22uF, and the eleventh capacitor C11 has a value of 11000uF.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The power supply of the airborne airport wireless communication equipment based on the power supply of the vehicle-mounted equipment comprises an input connector, an input filtering and lightning protection device, an AC-DC module (M3), a DC-DC module (M4), an output filtering device and an output connector which are sequentially connected, and is characterized by further comprising a discrete quantity control module and a slow charge and fast discharge circuit module; the discrete quantity control module is used for receiving and processing signals sent by the output connector and then sending the processed signals to the DC-DC module (M4); the discrete quantity control module is also used for receiving and processing signals sent by the AC-DC module (M3) and then sending the processed signals to the output connector; the slow charge and fast discharge circuit module is used for charging and storing electric energy when the AC-DC module (M3) is electrified and discharging the electric energy when the AC-DC module (M3) is powered off;
the discrete quantity control module is provided with a first input end, a second input end, a first output end and a second output end, the first input end and the second input end of the discrete quantity control module are respectively connected with the output connector and the AC-DC module (M3), and the first output end and the second output end of the discrete quantity control module are respectively connected with the DC-DC module (M4) and the output connector;
the slow charge and fast discharge circuit module is provided with an input end and an output end, and the input end and the output end of the slow charge and fast discharge circuit module are respectively connected with the output end of the AC-DC module (M3) and the input end of the DC-DC module (M4);
the discrete quantity control module comprises an initial power input state detection and driving circuit and an intermediate power input state detection and driving circuit;
the initial power input state detection and driving circuit comprises a power supply (Vcc), a voltage comparator (M1), a signal blocker (M2), a first diode (D1), a second diode (D2) and a first MOS (metal oxide semiconductor) tube (VT 1), wherein the model of the voltage comparator (M1) IS LM239DTBR2G, the model of the signal blocker (M2) IS LTC6994IS6-2, the negative electrode of the first diode (D1) IS used as a first input end of the discrete quantity control module, and the drain electrode of the first MOS tube (VT 1) IS used as a first output end of the discrete quantity control module;
the twelfth pin of the voltage comparator (M1) is grounded, the fourth pin and the fifth pin of the voltage comparator (M1) are grounded through a second capacitor (C2) and a first capacitor (C1) respectively, a power supply (Vcc) is grounded through a third resistor (R3) and a fourth resistor (R4) which are sequentially connected in series, the fourth pin of the voltage comparator (M1) is further connected to a circuit connected with the third resistor (R3) and the fourth resistor (R4), a second resistor (R2) is connected between the positive electrode of the first diode (D1) and the other end of the first capacitor (C1) which is grounded relatively, and a first resistor (R1) is connected between the positive electrode of the first diode (D1) and the power supply (Vcc);
the third pin of the voltage comparator (M1) is connected with a power supply (Vcc), and the third pin of the voltage comparator (M1) is grounded through a third capacitor (C3); the second pin of the voltage comparator (M1) is connected with the fifth pin of the voltage comparator (M1) through a sixth resistor (R6) and a fifth resistor (R5) which are sequentially connected in series;
the second pin of the signal blocker (M2) is grounded, the third pin of the signal blocker (M2) is grounded through a ninth resistor (R9), a seventh resistor (R7) is connected in series between the first pin of the signal blocker (M2) and a power supply (Vcc), the first pin of the signal blocker (M2) is also connected to a circuit of the fifth resistor (R5) and a sixth resistor (R6), and the first pin of the signal blocker (M2) is grounded through an eighth resistor (R8);
the sixth pin of the signal blocker (M2) is connected with the grid electrode of the first MOS tube (VT 1) through a twelfth resistor (R12), the fifth pin of the signal blocker (M2) is connected with an external power supply of 5.1V, the fifth pin of the signal blocker (M2) is connected with the source electrode of the first MOS tube (VT 1) through a tenth resistor (R10) and an eleventh resistor (R11) which are sequentially connected in series, a fourth capacitor (C4) is also connected between the fifth pin of the signal blocker (M2) and the source electrode of the first MOS tube (VT 1), the fourth pin of the signal blocker (M2) is connected on a circuit connected with the tenth resistor (R10) and the eleventh resistor (R11), the source electrode of the first MOS tube (VT 1) is grounded, a fourteenth resistor (R14) is connected between the drain electrode of the first MOS tube (VT 1) and the power supply (Vcc), a fifteenth diode (D2) is connected between the drain electrode of the fourteenth resistor (R14) and the second MOS tube (VT 1), and the anode electrode of the second MOS tube (V2) is connected with the negative electrode of the second diode (Vcc 2);
the intermediate power input state detection and driving circuit comprises a power supply (Vcc), a third diode (D3), a second MOS tube (VT 2) and a sixteenth resistor (R16), one end of the sixteenth resistor (R16) is used as a second input end of the discrete quantity control module, and the positive electrode of the third diode (D3) is used as a second output end of the discrete quantity control module;
the sixth pin of the voltage comparator (M1) is connected with the fourth pin of the voltage comparator (M1), the seventh pin of the voltage comparator (M1) is connected with the second input end of the discrete quantity control module through a sixteenth resistor (R16), a seventeenth resistor (R17) is connected between the first pin and the seventh pin of the voltage comparator (M1), the first pin of the voltage comparator (M1) is connected with the grid electrode of a second MOS tube (VT 2) through an eighteenth resistor (R18), the grid electrode of the second MOS tube (VT 2) is grounded through a twentieth resistor (R20), a nineteenth resistor (R19) is connected between the other end of the twentieth resistor (R20) which is grounded relatively to a power supply (Vcc), the source electrode of the second MOS tube (VT 2) is grounded, the drain electrode of the second MOS tube (VT 2) is connected with the power supply (Vcc) through a twenty first resistor (R21), and the drain electrode of the second MOS tube (VT 2) is connected with the negative electrode of a third diode (D3);
the output connector is provided with a first enabling pin and a signal triggering pin, an AC-DC module (M3) is externally connected with an enabling circuit module, the output end of the enabling circuit module is used as a second enabling pin, a DC-DC module (M4) is provided with a third enabling pin, the discrete quantity control module is provided with a first input end and a second input end of the discrete quantity control module which are respectively connected with the first enabling pin and the second enabling pin, and the first output end and the second output end of the discrete quantity control module are respectively connected with the third enabling pin and the signal triggering pin;
the model of the AC-DC module (M3) is HGMB-35-W-17, an eighth pin of the AC-DC module (M3) is used as an output end of the AC-DC module (M3), a fifth pin of the AC-DC module (M3) is grounded, and a sixth pin of the AC-DC module (M3) is connected with a seventh pin;
the external enabling circuit module of the AC-DC module (M3) comprises a twenty-sixth resistor (R26), a twenty-seventh resistor (R27), a twenty-eighth resistor (R28) and an eighth diode (D8), wherein the twenty-sixth resistor (R26) and the twenty-seventh resistor (R27) are connected in parallel, one end of the twenty-sixth resistor (R26) is connected with a sixth pin of the AC-DC module (M3), the other end of the twenty-sixth resistor (R26) is connected with a negative electrode of the eighth diode (D8), the positive electrode of the eighth diode (D8) is grounded, the twenty-eighth resistor (R28) is connected with the eighth diode (D8) in parallel, and the negative electrode of the eighth diode (D8) is used as an output end of the enabling circuit module.
2. The on-board airport wireless communication device power supply of claim 1, wherein said DC-DC module (M4) is model LTM8027ev#pbf, the A4 pin of the DC-DC module (M4) being the third enable pin.
3. The power supply of an on-board airport wireless communication device based on an on-board device power supply of claim 1, wherein said output connector is of the type DMP 3-7W 2P-193, the fifth pin of the output connector is used as the first enable pin, and the third pin of the output connector is used as the signal trigger pin.
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| CN108418289A (en) * | 2018-05-23 | 2018-08-17 | 东莞众创新能源科技有限公司 | Hydrogen fuel cell hybrid dynamic system |
| CN110530932A (en) * | 2019-10-16 | 2019-12-03 | 绍兴职业技术学院 | A kind of soil moisture sensor based on the detection of RC charge and discharge peak-to-peak value |
| CN110830023A (en) * | 2019-10-25 | 2020-02-21 | 天津航空机电有限公司 | Discrete magnitude acquisition circuit suitable for threshold value accurate setting |
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