CN107889307B - Vehicle passenger room illumination redundancy backup power supply circuit and control method - Google Patents
Vehicle passenger room illumination redundancy backup power supply circuit and control method Download PDFInfo
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- CN107889307B CN107889307B CN201711060964.5A CN201711060964A CN107889307B CN 107889307 B CN107889307 B CN 107889307B CN 201711060964 A CN201711060964 A CN 201711060964A CN 107889307 B CN107889307 B CN 107889307B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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Abstract
The invention discloses a vehicle passenger room lighting redundant backup power supply circuit, which comprises two driving power supplies with the same internal structure, namely a first driving power supply and a second driving power supply, wherein the input ends of the two driving power supplies are connected with a power supply circuit, the output ends of the two driving power supplies are respectively connected with a load, the load capacity of the driving power supplies is higher than that of an actual load, each driving power supply comprises a power supply circuit unit, a control circuit unit and a backup circuit unit, the power supply circuit unit and the control circuit unit are led out from the input ends of the driving power supplies, the positive pole of the load of the power supply circuit unit and the backup circuit unit are connected, the control circuit unit is connected with the negative pole of the load, and the backup circuit units of the two driving power supplies are connected with each other. The invention also discloses a control method of the power supply circuit, combines the advantages of the existing redundant power supply method, and can greatly improve the stability of the lighting power supply system of the vehicle passenger room.
Description
Technical Field
The invention relates to the field of power supply equipment, in particular to a redundant backup power supply circuit for vehicle passenger room illumination and a control method.
Background
With the rapid development of the urban rail transit industry, the requirement on the reliability of a vehicle passenger room lighting power supply system is higher and higher, a subway vehicle generally runs in a tunnel and needs to be lighted by a passenger room lamp system, and if the power supply fails and the passenger room is not lighted, passengers are scared, and the running safety of a train is influenced. At present, a power supply redundancy method is generally adopted to improve the reliability of a power supply and deal with sudden failures. The existing power supply redundancy schemes are as follows: capacity redundancy, redundant cold backup, parallel current sharing N +1 backup and redundant hot backup. The capacity redundancy means that the maximum load capacity of the power supply is larger than the actual load, the reserved capacity space can ensure the normal work of the load and the normal work of the load under the condition that the load changes within a certain range, but the load variation amount which can be responded by the capacity redundancy is limited, and the significance for improving the reliability is small; the redundant cold backup is that a power supply consists of a plurality of modules with the same function, one of the modules supplies power when in normal state, when the power supply fails, the backup power supply starts to work immediately, and a time interval exists during power supply switching, so that a voltage gap is easily caused, and the system is shut down; the parallel current-sharing N +1 backup mode means that a power supply consists of a plurality of same units, all the units are connected in parallel through an OR gate diode, and all the units simultaneously supply power to equipment, so that the scheme cannot influence the power supply of a load when one power supply fails, but the short circuit of a load end easily affects all the units, and the risk of integral failure exists; the redundant hot backup means that the power supply consists of a plurality of units and works simultaneously, the backup power supply can be switched on immediately when the main power supply fails, the fluctuation of output voltage is small, but only one power supply supplies power to all equipment under full load, and other power supplies have no load, so that the service life of the power supply working under full load is firstly attenuated until the backup power supply fails to start, and the power supply switching cost is high. The above redundancy backup methods all have disadvantages, and cannot meet the requirement of reliability of the lighting power supply system of the vehicle passenger room.
In view of the above-mentioned drawbacks, the inventor of the present invention has obtained a redundant backup power supply circuit for vehicle cabin lighting and a control method thereof after a long time of research and practice.
Disclosure of Invention
In order to solve the technical defects, the technical scheme adopted by the invention is to provide a redundant backup power supply circuit, the power supply device is used for supplying power to a passenger room lighting system of a rail transit vehicle, and comprises two driving power supplies with the same internal structure, namely a first driving power supply and a second driving power supply, wherein the input ends of the two driving power supplies are connected with a power supply circuit, the output ends of the two driving power supplies are respectively connected with a load, the load capacity of the driving power supplies is higher than that of an actual load, each driving power supply comprises a power supply circuit unit, a control circuit unit and a backup circuit unit, the input end of the driving power supply is led out of a power supply circuit unit and a control circuit unit, the power supply circuit unit is connected with the anode of a load and a backup circuit unit, the control circuit unit is connected with the negative pole of the load, and the backup circuit units of the two driving power supplies are connected with each other.
Preferably, the backup circuit unit includes a backup input circuit and a backup output circuit, and the backup input circuit and the backup output circuit of the first driving power supply are respectively connected to the backup output circuit and the backup input circuit of the second driving power supply.
Preferably, the backup circuit unit includes a relay and a zener diode, the relay includes an on-off switch and a coil, an anode of the zener diode is connected to the power circuit unit, a cathode of the zener diode is connected to an input end of the coil, an output end of the coil is connected to a common end, and the backup input circuit of the first driving power supply is connected to the backup output circuit of the second driving power supply through the on-off switch.
Preferably, the power circuit unit comprises a stabilized voltage power supply and a diode, an input end of the stabilized voltage power supply is connected with the power supply circuit, an anode output end of the stabilized voltage power supply is connected with an anode of the diode, a cathode output end of the stabilized voltage power supply is connected with a public end, and an anode of a load and the backup circuit unit are led out from a cathode of the diode.
Preferably, the rated power of the stabilized voltage power supply is 350W, and the stabilized voltage power supply is provided with a fault indicator lamp.
The preferred, the control circuit unit includes a singlechip, a singlechip power and an adjustment switch, the input and the power supply circuit of singlechip power are connected, the output of singlechip power with the singlechip is connected, the adjustment switch includes first end, second end and controls its first end and the control end that the second end switched on, the control end of adjustment switch is connected the signal output part of singlechip, the negative pole of load is connected to the first end of adjustment switch, the common port is connected to the second end of adjustment switch.
Preferably, the adjustment switch is an N-channel MOS transistor, the first terminal is a drain, the second terminal is a source, and the control terminal is a gate.
Preferably, the control circuit unit further comprises a dial switch, and the dial switch is connected with the signal input end of the single chip microcomputer.
Preferably, each input end of the driving power supply is provided with an emergency signal input circuit, the emergency signal input circuit is connected with one signal input end of the single chip microcomputer through optical coupling isolation, the control circuit unit comprises a fault feedback circuit, and a fault signal is led out from the signal output end of the single chip microcomputer through the optical coupling isolation.
A control method with the vehicle passenger compartment illumination redundant backup power supply circuit comprises the following steps:
stp 1: the power supply circuit is powered on, the driving power supply is started under light load, and the two driving power supplies respectively supply power to the two loads;
stp 2: the control circuit unit adjusts the illumination intensity of the load;
stp 3: when a certain driving power supply fails, the backup circuit unit is switched on, and the normal driving power supply supplies power to the load of the whole vehicle; .
Stp 4: the fault driving power supply sends out a fault prompt signal;
stp 5: and after the fault driving power supply is repaired, the power supply circuit is connected, the step of Stp1 is repeated, and the two driving power supplies respectively supply power to the two loads.
Compared with the prior art, the invention has the beneficial effects that: the redundant backup power supply circuit is applied to a passenger room lighting power supply system, equipment consists of two driving power supplies which are redundant backup to each other, the driving power supplies work simultaneously and backup to each other, a load is also supplied with power in two ways, each unit is independent when working normally, and the load is supplied with power in two ways independently, so that the load cannot affect all the units when in short circuit; when one driving power supply fails, the load of the driving power supply is connected to the other power supply through the backup single-path unit, the driving power supply supplies power to the whole vehicle lamp, and the driving power supply has no influence on the load of a normal power supply and no voltage gap; and the single driving power supply is designed with redundant capacity, the driving power supply works under the condition of light load during normal work, the service life of the driving power supply is not influenced, and one driving power supply can independently supply power for all loads when a fault occurs. The equipment also has a fault alarm function, when a fault occurs, an indicator lamp of the power supply is lightened, and meanwhile, a fault signal output end outputs a fault prompt signal.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a block diagram of a redundant backup power supply circuit of the present invention;
FIG. 2 is an electronic circuit diagram of the redundant backup power supply circuit of the present invention;
FIG. 3 is an enlarged view of the drive power input;
FIG. 4 is an enlarged view of the drive power supply output;
fig. 5 is a flow chart of the operation of the redundant backup power supply circuit.
The figures in the drawings represent:
1. the driving circuit comprises a first driving power supply 2, a second driving power supply 11, a power circuit unit 12, a control circuit unit 13 and a backup circuit unit.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
As shown in fig. 1, a redundant backup power supply circuit for supplying power to a passenger compartment lighting system of a rail transit vehicle includes two driving power supplies with the same internal structure, namely a first driving power supply 1 and a second driving power supply 2. The input ends of the two driving power supplies are connected with the power supply circuit, and the output ends of the two driving power supplies are respectively connected with one path of load.
The drive power supply has a power supply circuit unit 11, a control circuit unit 12, and a backup circuit unit 13. The power circuit unit 11 is used for converting the power provided by the vehicle power supply circuit into a stable output for the load. The control circuit unit 12 is used for controlling the output current and adjusting the illumination brightness of the load. The backup circuit units 11 of the two driving power supplies are connected to each other so that the two driving power supplies backup each other. When the load is in normal operation, the two driving power supplies are not connected, and the load is independently supplied with power in two paths, so that all units cannot be affected when the load end is in short circuit.
As shown in fig. 2, 3, and 4, the two loads are an LED light source 1 and an LED light source 2, and are separately powered by a first driving power supply 1 and a second driving power supply 2. The internal structures of the two driving power supplies are the same, and taking the first driving power supply 1 as an example, the driving power supply has an input interface CON1, an output interface CON2, and a backup interface CON 3. The input interface CON1 has a supply input 110V +, 110V-, an emergency signal input EM, and a fault signal output TCMS. The output interface CON2 has an output terminal LED +, LED-, and a ground terminal PE. The backup interface CON3 has a backup output OUT +, a backup input IN +, a common terminal GND, and a ground terminal PE. The input interface CON1 is connected with the vehicle power supply system, the output interface CON2 is connected with the load, the output interface CON2 of the first driving power supply 1 is connected with the LED light source 1, the output interface CON2 of the second driving power supply 2 is connected with the LED light source 2, and the backup interfaces CON3 of the two driving power supplies are connected with each other.
The power circuit unit 11 includes a regulated power supply U1 and a diode Z1, and the input terminals 110V +, 110V-of the input interface CON1 are connected to the regulated power supply U1. And the positive output end of the voltage-stabilized power supply U1 is connected with the positive electrode of the diode Z1, and the negative output end of the voltage-stabilized power supply U1 is connected with the public end. The cathode of the diode Z1 is connected to the output end LED + of the output interface CON2, and the cathode of the diode Z1 leads out of the backup circuit unit 13. The rated power of the regulated power supply U1 is 350W, and the load capacity of the regulated power supply U1 is higher than that of the actual load of the LED light source 1 and the LED light source 2. When the voltage-stabilized power supply U1 works under a light-load condition in normal work, the service life of the power supply is not influenced, the capacity of a single power supply is designed to be redundant, and one driving power supply can independently supply power for all loads when a fault occurs. The regulated power supply U1 is also provided with a fault indicator light which is turned on when the power supply fails to give a fault alarm.
The control circuit unit 12 comprises a single-chip microcomputer MCU, a single-chip microcomputer power supply U2 and an adjusting switch Q1. The input end 110V +, 110V-of the driving power input interface CON1 leads out a singlechip power supply U2, and the output end of the singlechip power supply U2 is connected with the singlechip MCU to supply power to the singlechip MCU. The emergency signal input end EM of the input interface CON1 is connected with an input end of the single-chip microcomputer MCU through the optical coupling isolator OC1, and is used for sending an emergency signal to the single-chip microcomputer MCU. One output end of the single chip microcomputer MCU is connected with a fault signal output end TCMS of the input interface CON1 through the optical coupling isolator OC2 and used for feeding back a power supply fault signal, and when a fault occurs, an indicator lamp of a power supply is lightened, and meanwhile, the fault signal output end TCMS outputs a high level to prompt the fault. The fault signal output terminal TCMS outputs a low level of about 1.5V in a normal operation and outputs a high level in a fault.
The adjusting switch Q1 includes a first end, a second end, and a control end for controlling the conduction of the first end and the second end, the control end is connected to the signal output end of the MCU, the first end is connected to the output end LED of the output interface CON2, and the second end is connected to the common end GND of the output interface CON 3. The adjusting switch Q1 is an N-channel MOS transistor, the first terminal is a drain, the second terminal is a source, and the control terminal is a gate. The single chip microcomputer MCU can send dimming signals to the adjusting switch Q1, and the adjustment of the lighting brightness of the load is realized by changing the voltage of the control end of the adjusting switch Q1.
The control circuit unit 12 further includes a dial switch SW, and the dial switch SW is connected to a signal input end of the MCU. A plurality of gears can be selected through the dial switch SW, and the light brightness can be adjusted. And the emergency lighting mode can automatically adjust the lighting brightness.
The backup circuit unit 13 includes a backup input circuit and a backup output circuit, both of which are led OUT from the power circuit unit 11, the backup output circuit is connected to the backup output terminal OUT + of the backup interface CON3, and the backup input circuit is connected to the backup input terminal IN + of the backup interface CON 3. When the backup interfaces CON3 of the two driving power supplies are connected, the backup input circuit and the backup output circuit of the first driving power supply 1 are connected to the backup output circuit and the backup input circuit of the second driving power supply 2, respectively.
The backup circuit unit 13 includes a relay K1 and a zener diode ZD 1. The relay K1 comprises an on-off switch and a coil, the anode of the voltage stabilizing diode ZD1 is connected with the outlet end of the voltage stabilizing power supply U1, the cathode of the voltage stabilizing diode ZD1 is connected with the input end of the coil of the relay K1, the output end of the coil of the relay K1 is connected with the public end, and the two ends of the on-off switch of the relay K1 are connected with the backup input circuit. When the circuit works normally, the input end of the coil of the relay K1 is electrified, the on-off switch is disconnected, the backup circuits of the two driving power supplies are disconnected, and the two loads are respectively supplied with power. Taking the regulated power supply U1 of the first drive power supply 1 as an example, the drive power supply has no output, the relay K1 has no input signal, the on-off switch contact is closed, the backup input circuit of the first drive power supply 1 is connected with the backup output circuit of the second drive power supply 2, and the second drive power supply 2 supplies power to all loads. The closed contact of the relay K1 supplies power to the LED light source 1, no influence is caused on the load of the second driving power supply 2, no voltage gap is caused, and the switching of the whole vehicle lighting without flicker is realized when one driving power supply fails.
As shown in fig. 5, the control method of the redundant backup power supply circuit includes the following steps:
stp 1: when the redundant backup power supply circuit is powered on, the brightness of the LED gradually changes from dark to bright, so that the stabilized voltage power supplies U1 of the two driving power supplies are started from light load, the input starting current is reduced, meanwhile, the input end of the relay K1 is powered on, the contacts are disconnected, the two driving power supplies respectively supply power to the two LED light sources, and independent power supply ensures that all units cannot be affected when a local load end is short-circuited.
Stp 2: the gear is adjusted through the dial switch SW, and the singlechip MCU sends dimming signal, controls LED light source illumination intensity.
Stp 3: when a certain driving power supply fails, the stabilized voltage power supply U1 of the driving power supply has no output, the relay K1 has no input signal, the contact is closed, the contact is connected with the backup driving power supply through the backup circuit, the backup driving power supply supplies power for the load of the whole vehicle, the relay K1 is closed to supply power for the load of the failure power supply, and the load of the normal power supply has no influence and no voltage gap.
Stp 4: and a fault indicator lamp of the fault driving power supply is turned on, and meanwhile, a fault output port TCMS outputs a high level to prompt a fault.
Stp 5: and (4) maintaining the fault driving power supply, connecting a power supply circuit after the fault driving power supply is repaired, repeating the step of Stp1, and respectively supplying power to the two loads by the two driving power supplies.
The redundancy backup power supply circuit combines the advantages of capacity redundancy, parallel current-sharing N +1 backup and redundancy hot backup, a power supply consists of two units, the units work simultaneously and are backup for each other, a load is also divided into two paths of power supplies, the units are mutually independent in normal work, when one power supply fails, the load of a fault power supply is connected to the other power supply through a backup cable between the on-off of a relay and the power supply, the power supply is used for supplying power for all loads, the backup power supply can immediately drive all the loads when the power supply fails, no influence or voltage gap exists on the load of a normal power supply, and the reliability of a vehicle passenger room lighting power supply system is improved.
The foregoing is merely a preferred embodiment of the invention, which is intended to be illustrative and not limiting. It will be understood by those skilled in the art that various changes, modifications and equivalents may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A redundant backup power supply circuit for vehicle passenger room illumination is characterized by comprising two driving power supplies with the same internal structure, namely a first driving power supply and a second driving power supply respectively, wherein the input ends of the two driving power supplies are connected with a power supply circuit, the output ends of the two driving power supplies are connected with a load respectively, the load capacity of the two driving power supplies is higher than that of an actual load, each driving power supply comprises a power circuit unit, a control circuit unit and a backup circuit unit, the input ends of the two driving power supplies are led out of the power circuit unit and the control circuit unit, the power circuit unit is connected with the anode of the load and the backup circuit unit, the control circuit unit is connected with the cathode of the load, the backup circuit units of the two driving power supplies are connected with each other, and the two backup circuit units comprise a backup input circuit and a backup output circuit, the backup input circuit and the backup output circuit of the first driving power supply are respectively connected with the backup output circuit and the backup input circuit of the second driving power supply;
the backup circuit unit comprises a relay and a voltage stabilizing diode, the relay comprises an on-off switch and a coil, the anode of the voltage stabilizing diode is connected with the power circuit unit corresponding to the driving power supply, the cathode of the voltage stabilizing diode is connected with the input end of the coil corresponding to the relay, the output end of the coil is connected with a public end, and the backup input circuit of the first driving power supply is connected with the backup output circuit of the second driving power supply through the on-off switch;
the power supply circuit unit comprises a stabilized voltage power supply and a diode, the input end of the stabilized voltage power supply is connected with the power supply circuit, the positive electrode output end of the stabilized voltage power supply is connected with the positive electrode of the diode, the negative electrode output end of the stabilized voltage power supply is connected with the public end, and the negative electrode of the diode leads out the positive electrode of the load and the backup circuit unit corresponding to the driving power supply;
the control circuit unit comprises a single chip microcomputer, a single chip microcomputer power supply and an adjusting switch, wherein the input end of the single chip microcomputer power supply is connected with a power supply circuit, the output end of the single chip microcomputer power supply is connected with the single chip microcomputer, the adjusting switch comprises a first end, a second end and a control end for controlling the conduction of the first end and the second end, the control end of the adjusting switch is connected with the signal output end of the single chip microcomputer, the first end of the adjusting switch is connected with the negative electrode of a load, and the second end of the adjusting switch is connected with a common end;
an emergency signal input circuit is arranged at the input end of each driving power supply, and the emergency signal input circuit is connected with one signal input end of the single chip microcomputer through optical coupling isolation; and the input end of each driving power supply is provided with a fault signal output end, and one output end of the single chip microcomputer is connected with the fault signal output end through an optical coupling isolator.
2. A vehicle passenger compartment lighting redundant backup power supply circuit according to claim 1 wherein said regulated power supply has a power rating of 350W, said regulated power supply having a fault indicator light.
3. The vehicle passenger compartment lighting redundant backup power supply circuit of claim 1 wherein said trim switch is an N-channel MOS transistor, said first terminal is a drain, said second terminal is a source, and said control terminal is a gate.
4. The vehicle passenger compartment lighting redundant backup power supply circuit as claimed in claim 1, wherein said control circuit unit further comprises a dial switch, said dial switch being connected to a signal input of said single chip microcomputer.
5. A control method with a vehicle passenger compartment lighting redundant backup power supply circuit according to claim 1, characterized by comprising the steps of:
stp 1: the power supply circuit is powered on, the driving power supply is started under light load, and the two driving power supplies respectively supply power to the two loads;
stp 2: the control circuit unit adjusts the illumination intensity of the load;
stp 3: when a certain driving power supply fails, the backup circuit unit is switched on, and the normal driving power supply supplies power to the load of the whole vehicle;
stp 4: the fault driving power supply sends out a fault prompt signal;
stp 5: and after the fault driving power supply is repaired, the power supply circuit is connected, the step of Stp1 is repeated, and the two driving power supplies respectively supply power to the two loads.
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| CN201711060964.5A CN107889307B (en) | 2017-11-02 | 2017-11-02 | Vehicle passenger room illumination redundancy backup power supply circuit and control method |
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| CN201711060964.5A CN107889307B (en) | 2017-11-02 | 2017-11-02 | Vehicle passenger room illumination redundancy backup power supply circuit and control method |
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| CN107889307B true CN107889307B (en) | 2020-12-04 |
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| CN112600295A (en) * | 2020-12-04 | 2021-04-02 | 清华大学 | Power supply method for redundant vehicle-mounted sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01160330A (en) * | 1987-12-17 | 1989-06-23 | Nec Corp | Power supply circuit |
| JP3047458B2 (en) * | 1990-11-13 | 2000-05-29 | 株式会社明電舎 | System switching device for uninterruptible power supply system |
| JPH06121473A (en) * | 1992-10-06 | 1994-04-28 | Mitsubishi Electric Corp | Changeover device for variable-voltage to variable-frequency converter |
| CN2812380Y (en) * | 2004-12-17 | 2006-08-30 | 左东 | UPS system with mutual-aid redundant parallel function |
| CN201307950Y (en) * | 2008-05-21 | 2009-09-09 | 深圳市阳光富源科技有限公司 | Multi-stage dimming control circuit for LED streetlight |
| JP5477813B2 (en) * | 2010-06-21 | 2014-04-23 | 東芝三菱電機産業システム株式会社 | Uninterruptible power supply system |
| CN105960048A (en) * | 2016-05-23 | 2016-09-21 | 成都颉盛科技有限公司 | Brightness adjustable high-stability driving system for blue light LED |
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