CN106371544B - Power interruption protection system of airborne computer - Google Patents
Power interruption protection system of airborne computer Download PDFInfo
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- CN106371544B CN106371544B CN201610966729.3A CN201610966729A CN106371544B CN 106371544 B CN106371544 B CN 106371544B CN 201610966729 A CN201610966729 A CN 201610966729A CN 106371544 B CN106371544 B CN 106371544B
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Abstract
The invention relates to the technical field of power protection, in particular to an onboard computer power interruption protection system which comprises an EMI power filter, an interruption switching circuit and a backup power supply circuit, wherein the EMI power filter is arranged at the input inlet end of a power supply to conduct power EMI protection, a direct current power supply 28V of the EMI power filter is connected to the interruption switching circuit and is simultaneously connected with the backup power supply circuit to charge, the interruption switching circuit is responsible for monitoring main power supply in real time, and once the interruption switching circuit finds that the input direct current power supply 28V is interrupted or descends, the power supply of the direct current power supply 28V is closed through a MOS tube and is switched to the backup power supply circuit. Once the system finds that the power supply is interrupted or is reduced to the set value of the interruption switching circuit, the power supply is switched to the backup power supply circuit in a motion within 15us, so that the seamless switching power supply of the power supply circuit at the rear end is ensured, the switching speed is high, and the process is smooth and stable.
Description
[ technical field ]
The invention relates to the technical field of power protection, in particular to an onboard power supply interruption protection system.
[ background Art ]
In an aircraft power supply system, a transient power supply interruption phenomenon is unavoidable, and normal conversion of ground power supply and an APU generator before and after the main engine is started and power supply between the main generator and the APU generator after the engine is started can cause short-time power supply interruption of electric equipment in both parallel connection and non-parallel connection systems. Short power interruption (the time is not longer than 100 ms) has little influence on the operation of the past analog electric and electronic equipment, but can greatly interfere the normal operation of the electric and electronic equipment of a modern digital airplane, even change the original working state, and the integrated electronic system such as automatic navigation needs to be reset to work normally. The power supply conversion in the alternating current power supply system is controlled by a conversion interlocking circuit of the system, when the alternating current power supply system needs to be converted to a new power supply, the original power supply is firstly disconnected by the interlocking circuit, and the new power supply is connected after the aircraft experiences a short power interruption state. The system power interruption time is mainly determined by EPC conversion time and delay time of a detection circuit.
With the rapid development of aviation technology, a large number of microprocessors are equipped in civil aviation aircraft, for example, 51 systems on a Boeing 767 aircraft use CPU, and for safety and reliability, many systems are equipped with 2-3 sets of redundant systems, and the total number of CPU used by the whole aircraft is 170. If the device is suddenly powered off during operation, some data may be lost and not normally operated, for example, if the FMC is powered off for more than 200ms, it must be resynchronized with another FMC to operate normally. Although auxiliary circuits are added in a power supply system and electronic equipment to reduce the interference of power interruption to the equipment, an abnormal event of the electronic equipment caused by the power interruption still occurs, so that the adoption of an uninterrupted technology is imperative when the power is normally switched.
The interruption technology generally adopts the steps that when the power supply is normally switched, all the power supplies are connected in parallel for a short time, then the original power supply is disconnected, and the new power supply bears all power supply tasks, so that the phenomenon of power supply interruption in the normal power supply switching process can be completely eliminated as long as the circuit design is correct and the control logic is tight. However, when parallel power supply between the switching power supplies is implemented, the two power supplies must satisfy the following requirements: the phase difference between the voltage waveform, the phase sequence, the frequency, the voltage value and the input parallel moment is within a specified range, so that the impulse current and the impulse power generated at the parallel moment can not exceed the allowable range, and the normal operation after the parallel connection can be ensured. If the parallel condition is not satisfied, the aircraft power grid can generate great current, voltage and power impact, so that the parallel generators on the power grid are disconnected and exit from parallel connection, and the parallel connection fails. For this purpose, appropriate protection measures must be taken at the terminal equipment to solve the above problems of impact, surge, interruption, etc. that may occur.
[ summary of the invention ]
The invention relates to an onboard power supply interruption protection system which is reliable in connection and novel in structure, and aims at the condition that current, voltage and power impact generated instantaneously during switching between main and standby power supplies are easy to cause parallel impact, surge and interruption on a power grid according to the power supply interruption phenomenon in the normal power supply conversion process in the prior art.
In order to achieve the above purpose, an on-board computer power interruption protection system is designed, the power interruption protection system comprises an EMI power filter, an interruption switching circuit and a backup power supply circuit, the EMI power filter is arranged at the input inlet end of the power supply to perform power EMI protection, a direct current power supply 28V passing through the EMI power filter is connected to the interruption switching circuit and is simultaneously connected with the backup power supply circuit to perform charging, the interruption switching circuit is responsible for monitoring main power supply in real time, once the interruption switching circuit finds that the input direct current power supply 28V is interrupted or descends, the power supply of the direct current power supply 28V is closed through a MOS tube and is switched to the backup power supply circuit, the output end of the backup power supply circuit is connected to the input end of the interruption switching circuit, and the output end of the interruption switching circuit is respectively connected with a +12v power supply circuit, +5v power supply circuit and a +3v power supply circuit to be used for outputting to the computer system to supply power.
The interrupt switching circuit takes a chip U16 as a main control chip, a No. 2 pin E1 end of the chip U16 is connected with a direct current power supply 28V, a resistor R119 and a resistor R120 are connected in series between a No. 2 pin E1 end and a No. 3 pin GND end of the chip U16, two ends of the resistor R120 are connected with a capacitor C95 in parallel, a resistor R121 is connected between a No. 4 pin E2 end and a No. 5 pin H2 end of the chip U16, the No. 4 pin E2 end of the chip U16 is additionally extracted, one end of the No. 4 pin E2 end of the chip U16 is connected to a connection point between the resistor R119 and the resistor R120, a No. 6 pin G2 end of the chip U16 is divided into two paths which are respectively connected to a No. 1 pin of a MOS tube Q26 and a No. 1 pin of the MOS tube Q23, the No. 3 pins of the MOS tube Q26 and the MOS tube Q23 are connected, the No. 4 pin of the MOS tube Q26 is connected with a backup power supply circuit, one end of the No. 7 pin V2 end of the chip U16 is led OUT to be connected with the capacitor C93 and then grounded, one end of the pin is extracted to be connected with the No. 4 pin of the MOS tube Q26, the No. 8 pin Vs end of the chip U16 is used as an OUT output end of the interrupt switching circuit and is respectively connected with the +12V power supply circuit, +5V power supply circuit and the +3V power supply circuit, one end of the pin No. 8 Vs end of the chip U16 is extracted to be connected with the capacitor C94 and then grounded, the No. 9 pin V1 end of the chip U16 is connected with the capacitor C97 and then grounded, the No. 10 pin G1 of the chip U16 is connected with the No. 1 pin of the MOS tube Q24, the No. 4 pin of the MOS tube Q24 and the No. 9 pin V1 end of the chip U16 are combined and then connected with the DC power supply 28V, and the No. 3 pin of the MOS tube Q24 and the No. 4 pin of the MOS tube Q23 are connected to the OUT output end of the interrupt switching circuit.
The backup power supply circuit takes a chip U15 as a main control chip, a 20-number pin VIN of the chip U15 is connected with a direct-current voltage 28V as a chip power supply and connected with a capacitor C80 for filtering, a 1-number pin EN/UVLO end of the chip U15 is connected with the direct-current voltage 28V through a resistor R103, a resistor R104 and a voltage stabilizing diode D7 are respectively connected in parallel with the resistor R103 and a ground end, a 12-number pin RT of the chip U15 is connected with a resistor R105 and then grounded, a 13-number pin SYNC of the chip U15 is connected with a resistor R108 and then grounded, a resistor R110 is connected between a 2-number pin VREF end and a 5-number pin CTRL1 end of the chip U15, one end of the 5-number pin CTRL1 end of the chip U15 is additionally extracted and connected with a resistor R111 and then grounded, one end of the 2-number pin VREF end of the chip U15 is additionally extracted and grounded after being connected with a resistor R114, one end of the 2-number pin VREF end of the chip U15 is additionally extracted and grounded after being connected with a capacitor C, the No. 6 pin SS of the chip U15 is grounded after being connected with a capacitor C89, the No. 10 pin VC of the chip U15 is sequentially connected with a resistor R116 and a capacitor C90 and then grounded, the No. 15 pin HG of the chip U15 is connected with the No. 4 pin of a MOS tube Q19, the No. 5 pin of the MOS tube Q19 is connected with a direct-current voltage 28V, one end of the tap is connected with a capacitor C81 and a capacitor C82 which are connected in parallel, the No. 17 pin CBOOT of the chip U15 is sequentially connected with a resistor R106, a capacitor C83, an inductor L6, a resistor R107 and a zener diode D4, one end of the resistor R106 is extracted from the capacitor C83, one end of the resistor is connected with the zener diode D5 and then connected with the No. 19 pin VCC_INT of the chip U15, one end of the 19 pin VCC_INT of the chip U15 is extracted from the other end of the resistor C86 and then grounded, one line of the capacitor C83 is extracted from the capacitor C6 and connected with the 16 pin SW of the chip U15, the No. 18 pin LG of the chip U15 is connected with the No. 4 pin of the MOS tube Q20, the No. 5 pin of the MOS tube Q20 is connected to the No. 16 pin SW end of the chip U15, a voltage stabilizing diode D6 is connected between the No. 5 pin and the No. 3 pin of the MOS tube Q20 in parallel, a capacitor C88 is connected between the No. 8 pin SENSEP end and the No. 9 pin SENSEP end of the chip U15, two ends of the capacitor C88 are respectively connected with a resistor R112 and a resistor R115 and then are connected to two ends of a resistor R107, a capacitor C92, a capacitor C84 and a capacitor C85 are grounded between the resistor R107 and the voltage stabilizing diode D4, one end of the positive electrode of the voltage stabilizing diode D4 is extracted and connected with a resistor R113 and then is connected to the No. 7 pin FB end of the chip U15, one end of the positive electrode of the voltage stabilizing diode D4 is extracted and then grounded, the negative electrode of the voltage stabilizing diode D4 is used as an output end of a backup power supply circuit, and the output end of the voltage stabilizing diode D4 is grounded and filtered by the electrolytic capacitor CT 8.
Compared with the prior art, the invention has the advantages that: once the system finds that the power supply is interrupted or falls to the set value of the interruption switching circuit, the power supply is switched to the backup power supply circuit in a motion within 15us, so that the power supply of the +12V power supply circuit, the +5V power supply circuit and the +3.3V power supply circuit at the rear end is ensured to be switched and supplied in a seamless manner, the backup power supply switching speed is high, and the switching process is smooth and stable by matching with a filtering circuit at the rear stage, so that the realization efficiency is high; the interrupt operation and the power supply switching are realized by adopting a very small number of electronic components, and the control method is concise and has high reliability; the switching voltage point of the interrupt switching circuit and the charging voltage of the backup power supply circuit can be flexibly configured according to the resistance value of the resistor so as to meet the actual requirement, and the protection power and the interrupt time are accurately controllable; the EMI power filter is used as end protection, so that the protection effect is enhanced.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the structural connection of the present invention;
FIG. 2 is a schematic diagram of an interrupt switching circuit in the present invention;
fig. 3 is a schematic diagram of a backup power supply circuit in the present invention.
Detailed description of the preferred embodiments
The construction and principles of such a device will be apparent to those skilled in the art from the following description of the invention taken in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Fig. 1 is a schematic diagram of a system structure of an on-board power supply interruption protection system in the invention, the power supply interruption protection system comprises an EMI power supply filter, an interruption switching circuit and a backup power supply circuit, wherein the EMI power supply filter is arranged at an input inlet end of a power supply for power supply EMI protection, a direct current power supply 28V passing through the EMI power supply filter is connected to the interruption switching circuit and is simultaneously connected with the backup power supply circuit for charging, the interruption switching circuit is responsible for monitoring main power supply in real time, once the interruption switching circuit finds that the input direct current power supply 28V is interrupted or descends, the power supply of the direct current power supply 28V is closed through a MOS tube and is switched to the backup power supply circuit, an output end of the backup power supply circuit is connected to an input end of the interruption switching circuit, and an output end of the interruption switching circuit is respectively connected with a +12v power supply circuit, +5v power supply circuit and a +3v power supply circuit for outputting to a computer system.
The interrupt switching circuit takes a chip U16 as a main control chip, a No. 2 pin E1 end of the chip U16 is connected with a direct current power supply 28V, a resistor R119 and a resistor R120 are connected in series between a No. 2 pin E1 end and a No. 3 pin GND end of the chip U16, two ends of the resistor R120 are connected with a capacitor C95 in parallel, a resistor R121 is connected between a No. 4 pin E2 end and a No. 5 pin H2 end of the chip U16, the No. 4 pin E2 end of the chip U16 is additionally extracted, one end of the No. 4 pin E2 end is connected to a connecting point between the resistor R119 and the resistor R120, a No. 6 pin G2 end of the chip U16 is divided into two paths which are respectively connected to a No. 1 pin of a MOS tube Q26 and a No. 1 pin of the MOS tube Q23, the MOS tube Q26 and a No. 3 pin of the MOS tube Q23 are connected, the No. 4 pin of the MOS tube Q26 is connected with a backup power supply circuit, one end of the No. 7 pin V2 end of the chip U16 is led OUT to be connected with the capacitor C93 and then grounded, one end of the pin is extracted to be connected with the No. 4 pin of the MOS tube Q26, the No. 8 pin Vs end of the chip U16 is used as an OUT output end of the interrupt switching circuit and is respectively connected with the +12V power supply circuit, +5V power supply circuit and the +3V power supply circuit, one end of the pin No. 8 Vs end of the chip U16 is extracted to be connected with the capacitor C94 and then grounded, the No. 9 pin V1 end of the chip U16 is connected with the capacitor C97 and then grounded, the No. 10 pin G1 of the chip U16 is connected with the No. 1 pin of the MOS tube Q24, the No. 4 pin of the MOS tube Q24 and the No. 9 pin V1 end of the chip U16 are combined and then connected with the DC power supply 28V, and the No. 3 pin of the MOS tube Q24 and the No. 4 pin of the MOS tube Q23 are connected to the OUT output end of the interrupt switching circuit.
The power supply input of the interrupt switching circuit is DC28V and BACKUP, the output is OUT output end, the chip U16 monitors the input power DC28V and BACKUP in real time, once the DC28V is interrupted or the voltage is lower than a set value, the chip U16 is controlled to act, the MOS tube Q24 is closed, the MOS tube Q23 and the MOS tube Q26 are opened, and the power supply is switched to a BACKUP power supply loop, so that the uninterrupted power supply output by the interrupt switching circuit is ensured. The resistance value of the interrupt switching circuit can be changed according to the requirement, the switching voltage point of the interrupt switching circuit can be flexibly configured, and once the interrupt switching circuit finds that the input direct current power supply 28V is interrupted or falls to the set value of the interrupt switching 1 circuit, the interrupt switching circuit is switched to the backup power supply circuit within 15 us.
The backup power supply circuit flexibly adjusts the charging voltage of the backup charging according to the actual power requirement so as to meet the energy and time required when the main power supply is interrupted. The backup power supply circuit is formed by taking a chip U15 as a main control chip, as shown in fig. 3, a No. 20 pin VIN of the chip U15 is connected with a direct-current voltage 28V as a chip power supply, and is connected with a capacitor C80 for filtering, a No. 1 pin EN/UVLO end of the chip U15 is connected with the direct-current voltage 28V through a resistor R103, a resistor R104 and a voltage stabilizing diode D7 are respectively connected in parallel with a resistor R103 and a ground end, a No. 12 pin RT of the chip U15 is connected with a resistor R105 and then grounded, a No. 13 pin SYNC of the chip U15 is connected with a resistor R108 and then grounded, a resistor R110 is connected between a No. 2 pin VREF end and a No. 5 pin CTRL1 end of the chip U15, one end of the No. 5 pin CTRL1 end of the chip U15 is additionally extracted and then grounded, a resistor R109 is connected between a No. 2 pin VREF end and a No. 3 pin CTRL2 end of the chip U15, one end of the No. 2 pin VREF end of the chip U15 is additionally extracted and grounded after being connected with a resistor R114, another end of the No. 2 pin VREF end of the chip U15 is extracted and then grounded, the No. 6 pin SS of the chip U15 is grounded after being connected with a capacitor C89, the No. 10 pin VC of the chip U15 is sequentially connected with a resistor R116 and a capacitor C90 and then grounded, the No. 15 pin HG of the chip U15 is connected with the No. 4 pin of a MOS tube Q19, the No. 5 pin of the MOS tube Q19 is connected with a direct-current voltage 28V, one end of the tap is connected with a capacitor C81 and a capacitor C82 which are connected in parallel, the No. 17 pin CBOOT of the chip U15 is sequentially connected with a resistor R106, a capacitor C83, an inductor L6, a resistor R107 and a zener diode D4, one end of the resistor R106 is extracted from the capacitor C83, one end of the resistor is connected with the zener diode D5 and then connected with the No. 19 pin VCC_INT of the chip U15, one end of the 19 pin VCC_INT of the chip U15 is extracted from the other end of the resistor C86 and then grounded, one line of the capacitor C83 is extracted from the capacitor C6 and connected with the 16 pin SW of the chip U15, the No. 18 pin LG of the chip U15 is connected with the No. 4 pin of the MOS tube Q20, the No. 5 pin of the MOS tube Q20 is connected to the No. 16 pin SW end of the chip U15, a voltage stabilizing diode D6 is connected between the No. 5 pin and the No. 3 pin of the MOS tube Q20 in parallel, 1/2/3 pin of the MOS tube Q20 is welded together so as to prevent current impact, a capacitor C88 is connected between the No. 8 pin SENSEP end and the No. 9 pin SENSEN end of the chip U15, two ends of the capacitor C88 are respectively connected with a resistor R112 and a resistor R115 and then are connected to two ends of a resistor R107, a capacitor C92, a capacitor C84 and a capacitor C85 are connected between the resistor R107 and the voltage stabilizing diode D4 in a grounded mode, one end of the positive electrode of the voltage stabilizing diode D4 is connected with the resistor R113 and then is connected to the No. 7 pin FB end of the chip U15, one end of the negative electrode of the voltage stabilizing diode D4 is grounded after being extracted, the negative electrode of the voltage stabilizing diode D4 is used as the output end of a backup power supply circuit, and the output end of the backup power supply circuit is grounded after being connected with the electrolytic capacitor CT 8. Wherein, MOS pipe Q20 and the inside short circuit of MOS pipe Q19's No. 1, no. 2, no. 3 pin prevents that the excessive current from causing MOS pipe damage or overheated.
Claims (2)
1. The power interruption protection system for the onboard computer is characterized by comprising an EMI power filter, an interruption switching circuit and a backup power supply circuit, wherein the EMI power filter is arranged at the input inlet end of a power supply and is used for protecting power EMI, a direct current power supply 28V passing through the EMI power filter is connected to the interruption switching circuit and is simultaneously connected with the backup power supply circuit for charging, the interruption switching circuit is responsible for monitoring main power supply in real time, once the interruption switching circuit finds that the input direct current power supply 28V is interrupted or descends, the power supply of the direct current power supply 28V is closed through a MOS tube and is switched to the backup power supply circuit, the output end of the backup power supply circuit is connected to the input end of the interruption switching circuit, the output end of the interruption switching circuit is respectively connected with a +12V power supply circuit, a +5V power supply circuit and a +3V power supply circuit for outputting to the computer system for power supply, the interrupt switching circuit takes a chip U16 as a main control chip, the end E1 of the No. 2 pin of the chip U16 is connected with a direct current power supply 28V, a resistor R119 and a resistor R120 are connected in series between the end E1 of the No. 2 pin and the end GND of the No. 3 pin of the chip U16, the two ends of the resistor R120 are connected with a capacitor C95 in parallel, a resistor R121 is connected between the end E2 of the No. 4 pin of the chip U16 and the end H2 of the No. 5 pin, the end E2 of the No. 4 pin of the chip U16 is additionally extracted and one end is connected to a connection point between the resistor R119 and the resistor R120, the end G2 of the No. 6 pin of the chip U16 is divided into two paths which are respectively connected to the No. 1 pin of the MOS tube Q26 and the No. 1 pin of the MOS tube Q23, the No. 3 pins of the MOS tube Q26 and the MOS tube Q23 are connected with a backup power supply circuit, the No. 4 pin of the MOS tube Q26 is connected with a backup power supply circuit after the end of the No. 7 pin V2 of the chip U16 is led out of one end and is connected with the capacitor C93, and one end is extracted and connected to the No. 4 pin of the MOS tube Q26, the end of the No. 8 pin Vs of the chip U16 is used as the output end of the OUT of the interrupt switching circuit to be respectively connected to the +12V power supply circuit, +5V power supply circuit and the +3V power supply circuit, the end of the No. 8 pin Vs of the chip U16 is additionally extracted OUT and connected with the capacitor C94 and then grounded, the end of the No. 9 pin V1 of the chip U16 is connected with the capacitor C97 and then grounded, the end of the No. 10 pin G1 of the chip U16 is connected with the No. 1 pin of the MOS transistor Q24, the end of the No. 4 pin of the MOS transistor Q24 and the end of the No. 9 pin V1 of the chip U16 are combined and then connected to the direct current power supply 28V, the end of the OUT of the interrupt switching circuit is connected with the No. 3 pin of the MOS transistor Q24 and the No. 4 pin of the MOS transistor Q23, the power supply input of the interrupt switching circuit is DC28V and BACKUP, the output is an OUT output end, the chip U16 monitors the input power DC28V and the BACKUP in real time, once the DC28V is interrupted or the voltage is lower than a set value, the chip U16 is controlled to act, the MOS tube Q24 is closed, the MOS tube Q23 and the MOS tube Q26 are opened, the power supply is switched to a BACKUP power supply loop, the power supply output by the interruption switching circuit is uninterrupted, the resistance value of the interruption switching circuit can be changed according to the requirement, the switching voltage point of the interruption switching circuit is flexibly configured, and once the interruption switching circuit finds that the input direct current power supply 28V is interrupted or falls to an interruption switching 1 circuit set value, the interruption switching circuit is switched to the BACKUP power supply circuit within 15 us.
2. The system of claim 1, wherein the backup power supply circuit is formed by connecting a chip U15 as a main control chip, a 20-pin VIN of the chip U15 is connected with a DC voltage 28V as a chip power supply, and connected with a capacitor C80 for filtering, a 1-pin EN/UVLO of the chip U15 is connected with the DC voltage 28V through a resistor R103, a resistor R104 and a zener diode D7 are respectively connected in parallel with the resistor R103 and a ground terminal, a 12-pin RT of the chip U15 is connected with a resistor R105 and then grounded, a 13-pin SYNC of the chip U15 is connected with a resistor R108 and then grounded, a resistor R110 is connected between a 2-pin VREF end and a 5-pin CTRL1 end of the chip U15, a 5-pin CTRL1 end of the chip U15 is additionally extracted and connected with a resistor R111 and then grounded, a resistor R109 is connected between the 2-pin VREF end and the 3-pin CTRL2 end of the chip U15, the end of the No. 3 pin CTRL2 of the chip U15 is additionally extracted and one end of the No. 2 pin VREF of the chip U15 is connected with a resistor R114 and then grounded, the end of the No. 2 pin VREF of the chip U15 is additionally extracted and one end of the No. 2 pin VREF of the chip U15 is connected with a capacitor C87 and then grounded, the end of the No. 6 pin SS of the chip U15 is connected with a capacitor C89 and then grounded, the end of the No. 10 pin VC of the chip U15 is sequentially connected with a resistor R116 and a capacitor C90 and then grounded, the end of the No. 15 pin HG of the chip U15 is connected with the No. 4 pin of the MOS transistor Q19, the No. 5 pin of the MOS transistor Q19 is connected with a direct current voltage 28V, one end of the tap is connected with a capacitor C81 and a capacitor C82 which are connected in parallel, the end of the No. 17 pin CBOOT of the chip U15 is sequentially connected with a resistor R106, a capacitor C83, an inductor L6, a resistor R107 and a voltage stabilizing diode D4 are sequentially extracted between the resistor R106 and the capacitor C83 and one end of the capacitor C5 and then connected with the 19 pin INT of the chip U15, the end of the No. 19 pin VCC of the chip U15 is additionally extracted and one end of the pin VCC is grounded, one end of the chip C19 is connected with the capacitor C86 and connected with the end of the capacitor C16 and the end of the capacitor C6 is connected with the end of VCC C15, the end of an 18-number pin LG of the chip U15 is connected to the end of a 4-number pin of the MOS tube Q20, the end of a 5-number pin of the MOS tube Q20 is connected to the end of a 16-number pin SW of the chip U15, a voltage stabilizing diode D6 is connected between the end of the 5-number pin and the end of the 3-number pin of the MOS tube Q20 in parallel, a capacitor C88 is connected between the end of an 8-number pin SENSEP end and the end of a 9-number pin SENSEN end of the chip U15, two ends of the capacitor C88 are respectively connected with a resistor R112 and a resistor R115 and then are connected to two ends of a resistor R107, a capacitor C92, a capacitor C84 and a capacitor C85 are connected between the resistor R107 and the voltage stabilizing diode D4 in opposite directions, one end of the positive electrode of the voltage stabilizing diode D4 is pulled out, one end of the positive electrode of the voltage stabilizing diode D4 is connected with the end of the resistor R113 and then is connected to the end of the 7-number pin FB end of the chip U15, one end of the positive electrode of the voltage stabilizing diode D4 is grounded after being pulled out of a terminating resistor R117, the negative electrode of the voltage stabilizing diode D4 is used as the output end of a backup power supply circuit, and output end of the output signal is grounded after being terminated with an electrolytic capacitor CT 8.
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| CN201610966729.3A CN106371544B (en) | 2016-11-04 | 2016-11-04 | Power interruption protection system of airborne computer |
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| CN201610966729.3A CN106371544B (en) | 2016-11-04 | 2016-11-04 | Power interruption protection system of airborne computer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015032126A1 (en) * | 2013-09-09 | 2015-03-12 | 惠州市蓝微电子有限公司 | Electric tool control circuit |
| WO2015074471A1 (en) * | 2013-11-25 | 2015-05-28 | 广东美的制冷设备有限公司 | Electrostatic protection device, intelligent power module and frequency-conversion home appliance |
| CN103746444A (en) * | 2013-11-28 | 2014-04-23 | 苏州长风航空电子有限公司 | Dual-power bus cold standby power supply architecture and method |
| CN204559536U (en) * | 2014-12-30 | 2015-08-12 | 深圳市兰丁科技有限公司 | Commutation circuit and charging device |
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