CN112737325A - Vehicle-mounted power supply system - Google Patents
Vehicle-mounted power supply system Download PDFInfo
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- CN112737325A CN112737325A CN202011559863.4A CN202011559863A CN112737325A CN 112737325 A CN112737325 A CN 112737325A CN 202011559863 A CN202011559863 A CN 202011559863A CN 112737325 A CN112737325 A CN 112737325A
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- power supply
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- voltage
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators with digital control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The invention discloses a vehicle-mounted power supply system, which comprises: the power supply module is used for outputting power supply voltage; the power supply conversion module group is connected with the power supply module and used for converting and outputting the power supply voltage according to the working voltage of load equipment on the vehicle; and one end of the current equalizing module group is connected with the power supply conversion module group, and the other end of the current equalizing module group is connected with the load equipment and is used for adjusting the output voltage of the power supply conversion module group so as to enable the current flowing through the current equalizing module group to be equal to the current flowing through the load equipment. The invention can realize the parallel current sharing of the power supply conversion modules, so as to avoid different heat losses of the power supply conversion modules caused by unequal power, further prolong the service life of the power supply conversion modules and further improve the safety of a vehicle-mounted power supply system.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a vehicle-mounted power supply system for urban rail transit.
Background
Currently, an on-board power supply system is mainly responsible for supplying an operating voltage (e.g., 24V) to load devices (e.g., a communication system, a lighting lamp, headlights and tail lamps of a train, etc.) on an urban rail transit vehicle. Because the direct current voltage (for example, 110V) provided by the rail transit vehicle is not matched with the normal working voltage of the load device, the direct current voltage provided by the rail transit vehicle needs to be converted into the working voltage corresponding to each load device, so that the normal work of each load device in the vehicle is ensured; in addition, in the process that the existing vehicle-mounted power supply system supplies power to load equipment of a vehicle, the problems of electromagnetic interference, reverse connection of a power supply and unbalanced current distribution often exist, and the stability and the reliability of the existing vehicle-mounted power supply system are low.
Disclosure of Invention
The invention aims to provide a vehicle-mounted power supply system, which solves the problems of unbalanced current distribution, electromagnetic interference and the like in the prior art so as to improve the reliability of the vehicle-mounted power supply system.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an on-board power supply system comprising:
the power supply module is used for outputting power supply voltage;
the power supply conversion module group is connected with the power supply module and used for converting and outputting the power supply voltage according to the working voltage of load equipment on the vehicle; and
and one end of the current equalizing module group is connected with the power supply conversion module group, and the other end of the current equalizing module group is connected with the load equipment and is used for adjusting the output voltage of the power supply conversion module group so as to enable the current flowing through the current equalizing module group to be equal to the current flowing through the load equipment.
Preferably, the power conversion module group comprises at least two power conversion modules for performing parallel redundancy backup;
the current-sharing module group comprises a plurality of current-sharing modules, and the number of the current-sharing modules is the same as that of the power supply conversion modules;
the input end of each power supply conversion module is connected with the power supply module; the output end of each power supply conversion module is correspondingly connected with the input end of each current equalizing module; and the output end of each current equalizing module is connected with the load equipment.
Preferably, each of the current equalizing modules includes a current equalizing circuit, and the current equalizing circuits are arranged by using a droop method.
Preferably, the vehicle-mounted power supply system further includes: the device comprises a filtering module, a plurality of voltage monitoring modules and a plurality of anti-back-pressure modules;
the input end of the filtering module is connected with the power supply module, and the output end of the filtering module is connected with the input ends of all the power conversion modules and is used for inhibiting common-mode interference and differential-mode interference of each power conversion module;
each voltage monitoring module is correspondingly connected with the output end of each power supply conversion module and is used for acquiring the output voltage data of each power supply conversion module;
the input end of each anti-reverse-voltage module is correspondingly connected with the output end of each power supply conversion module, and the output end of each anti-reverse-voltage module is connected with the load equipment and used for preventing voltage corresponding to the power supply conversion module from reversely flowing.
Preferably, the number of the voltage monitoring modules is the same as that of the power conversion modules;
the number of the anti-back-pressure modules is the same as that of the power supply conversion modules.
Preferably, the filtering module includes: a filter; the input end of the filter is connected with the power supply module, and the output end of the filter is connected with the input ends of all the power supply conversion modules.
Preferably, the filtering module further comprises: a voltage dependent resistor and a transient voltage suppressor diode;
one end of the piezoresistor is connected with the anode of the input end of the filter, and the other end of the piezoresistor is connected with the cathode of the input end of the filter;
one end of the transient voltage suppression diode is connected with the anode of the output end of the filter, and the other end of the transient voltage suppression diode is connected with the cathode of the output end of the filter.
Preferably, each of the voltage monitoring modules includes: the voltage acquisition device and the indicator light;
the input end of the voltage acquisition device is correspondingly connected with the output end of each power supply conversion module, and the output end of the voltage acquisition device is connected with the indicator light; and the voltage acquisition device controls the indicator lamp to light according to the output voltage data corresponding to the power supply conversion module and a preset voltage monitoring range.
Preferably, the output voltage of the power conversion module is 24V, and each anti-reverse voltage module is a diode;
the output voltage of the power supply conversion module is 12V, and each anti-back-pressure module is an MOS (metal oxide semiconductor) tube.
Preferably, the power supply voltage output by the power supply module is a direct current voltage; and each power conversion module is a DC/DC converter.
Compared with the prior art, the invention has at least one of the following advantages:
according to the vehicle-mounted power supply system, the power supply conversion module group can convert and output the power supply voltage provided by the power supply module according to the working voltage of the load equipment on the vehicle, and the power supply conversion module group comprises at least two power supply conversion modules, so that parallel redundancy backup is realized, and the reliability of the vehicle-mounted power supply system is improved.
The current-sharing module group can adjust the output voltage of the power supply conversion module group, so that the parallel current sharing of the power supply conversion modules can be realized when the currents flowing through the current-sharing module group to the load equipment are equal, the heat loss difference of the power supply conversion modules caused by the unequal power is avoided, the service life of the power supply conversion modules is prolonged, and the stability and the safety of a vehicle-mounted power supply system are further improved.
The current sharing module adopts a droop method to realize the parallel current sharing of the power supply conversion module, is easier to realize than the traditional method of adding the current sharing controller, greatly avoids the instability problem caused by adding the current sharing controller, and further improves the reliability of the vehicle-mounted power supply system.
The filtering module can reduce common mode interference and differential mode interference of the power conversion module, thereby avoiding electromagnetic interference from being transmitted to a rear-stage module or equipment through a power line, and meanwhile, the filtering module can also protect the rear-stage module or equipment from being damaged by surge current, and the reliability of the vehicle-mounted power supply system is improved.
The voltage monitoring module can realize the acquisition and monitoring of the output voltage of the power supply conversion module, so as to conveniently judge whether the working state of the power supply conversion module is normal or not, and improve the reliability of the vehicle-mounted power supply system.
The anti-voltage-return module can prevent the voltage of the power supply conversion module from flowing backwards, avoid the phenomenon that the power supply conversion module is burnt out, and greatly improve the reliability of the vehicle-mounted power supply system.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle-mounted power supply system according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a current equalizing module of a vehicle-mounted power supply system according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a filtering module of a vehicle-mounted power supply system according to an embodiment of the present invention.
Detailed Description
The following provides a further detailed description of a vehicle-mounted power supply system according to the present invention with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
With reference to fig. 1 to 3, the present embodiment provides a vehicle-mounted power supply system, including: a power supply module 110 for outputting a power supply voltage; the power conversion module group is connected with the power supply module 110, and is used for converting and outputting the power supply voltage according to the working voltage of the load equipment 170 on the vehicle; and a current sharing module group, one end of which is connected to the power conversion module group and the other end of which is connected to the load device 170, for adjusting the output voltage of the power conversion module group, so that the currents flowing through the current sharing module group to the load device 170 are equal.
Referring to fig. 1 and fig. 2, the power conversion module set includes at least two power conversion modules 130 for performing parallel redundancy backup; the current-sharing module group comprises a plurality of current-sharing modules 150, and the number of the current-sharing modules 150 is the same as that of the power conversion modules 130; the input end of each power conversion module 130 is connected to the power supply module 110; the output end of each power conversion module 130 is correspondingly connected with the input end of each current equalizing module 150; and the output terminal of each current equalizing module 150 is connected to the load device 170.
It is understood that in some other embodiments, the power supply voltage output by the power supply module 110 is a dc voltage; and each of the power conversion modules 130 is a DC/DC converter.
Specifically, the power supply module 110 on the urban rail transit vehicle may adopt a storage battery (including a lithium battery pack, a lead-acid battery pack, a nickel-cadmium battery pack, and the like), and the power supply voltage output by the power supply module 110 may be a direct-current voltage of 110V. However, the operation voltage of the load device 170, such as the headlights and taillights of the urban rail transit vehicle, the emergency lights in the car, the communication system (e.g., car radio, etc.), etc., is generally 24V or 12V, so that the 110V dc voltage provided by the power supply module 110 needs to be converted into 24V or 12V dc voltage by the power conversion module 130, so that the load device 170 can normally operate. Preferably, when the operating voltage of the load device 170 is 24V, that is, when it is required to convert the direct current voltage of 110V into the direct current voltage of 24V, the power conversion module 130 may adopt an isolated DC/DC converter converting 110V into 24V; when the operating voltage of the load device 170 is 12V, that is, when the DC voltage of 110V needs to be converted into the DC voltage of 12V, the power conversion module 130 may adopt an isolated DC/DC converter converting 110V into 12V, but the invention is not limited thereto.
In this embodiment, in order to meet the requirement of reliability of operation of the urban rail transit equipment, a 1+1 redundancy manner may be adopted for the power conversion modules 130 in the vehicle-mounted power supply system to perform parallel redundancy backup, and the power conversion module group may include two power conversion modules 130, that is, a first power conversion module and a second power conversion module. Under normal conditions, the first power conversion module works and the second power conversion module does not work; when the first power conversion module fails, the first power conversion module quits working, and the second power conversion module starts working, so as to ensure that the power supply voltage can still be converted into the working voltage required by the load device 170 when any one of the voltage conversion voltage modules 130 in the power conversion module group fails, thereby improving the reliability of the vehicle-mounted power supply system. Preferably, two power conversion modules 130 in the power conversion module group may be packaged on a power panel of an urban rail transit vehicle; the power input end of the load device 170 may be packaged on a load board of an urban rail transit vehicle.
Specifically, in this embodiment, because the load device 170 has a high requirement for current, when the power conversion modules 130 perform parallel redundancy backup in a 1+1 redundancy manner, it is further necessary to ensure that the currents output by any of the power conversion modules 130 to the load device 170 are equal through the current sharing module 150. Since the power conversion module set includes two power conversion modules 130, the current sharing module set may also include two current sharing modules 150, that is, the current sharing modules 150 correspond to the power conversion modules 130 one by one, but the invention is not limited thereto.
Referring to fig. 1 and fig. 2, each of the current equalizing modules 150 includes a current equalizing circuit, and the current equalizing circuits are arranged by using a droop method.
Specifically, two power conversion modules 130 in the power conversion module group are redundant backup in parallel, and each power conversion module 130 works independently; each of the current sharing modules 150 may adopt a droop method, that is, the current output from the power conversion module 130 to the load device 170 is adjusted according to the external characteristic and the output voltage corresponding to the power conversion module 130, so as to ensure that the currents output from the power conversion modules 130 to the load device 170 are equal, that is, to realize parallel current sharing, so as to avoid different heat losses of the power conversion modules 130 due to unequal power, thereby improving the service life of the power conversion modules 130, and further improving the safety of the vehicle-mounted power supply system, but the invention is not limited thereto.
In this embodiment, as shown in fig. 2, each of the current equalizing modules 130 includes one current equalizing circuit arranged according to a droop method, and the current equalizing circuit may include a sampling resistor Ri, a first operational amplifier and a second operational amplifier of a current Io output by one of the power converting modules 130 to the load device 170. The input end of the sampling resistor Ri is correspondingly connected with the output end of the power conversion module 130, and the output end of the sampling resistor Ri is connected with the load device 170; the non-inverting input end of the first operational amplifier is connected with the input end of the sampling resistor Ri, the inverting input end of the first operational amplifier is connected with the output end of the sampling resistor Ri, and the output end of the first operational amplifier is connected with the inverting input end of the second operational amplifier; the inverting input terminal of the second operational amplifier may further input a compensation voltage Vf corresponding to the sampling resistor Ri, the non-inverting input terminal of the second operational amplifier may further input a reference voltage Vg that is an operating voltage of the load device 170, and the output terminal of the second operational amplifier may be connected to a controller (e.g., a PWM controller) corresponding to the power conversion module 130. Each current sharing module 150 realizes parallel current sharing of the power conversion module 130 by adopting a droop method, which is easier to realize than the traditional method of adding a current sharing controller, and avoids the instability problem caused by adding a current sharing controller to a great extent, thereby further improving the reliability of the vehicle-mounted power supply system.
In this embodiment, when the current Io output to the load device 170 by the power conversion module 130 passes through the sampling resistor Ri, the sampling resistor Ri may directly detect the voltage according to the current Io, but since the resistance of the sampling resistor Ri is small, the voltage directly detected by the sampling resistor Ri is also small, the voltage directly detected by the sampling resistor Ri needs to be amplified by the first operational amplifier, and the voltage directly detected by the sampling resistor Ri after amplification is the feedback voltage Vi output by the first operational amplifier. Since the feedback voltage Vi and the compensation voltage Vf of the sampling resistor Ri are simultaneously input to the inverting input terminal of the second operational amplifier, the input voltage Vr of the inverting input terminal of the second operational amplifier is Vi + Vf, wherein the compensation voltage Vf of the sampling resistor Ri can be set according to the resistance of the sampling resistor Ri. The output voltage Ve of the second operational amplifier is an error voltage. When the current Io output by the power conversion module 130 to the load device 170 is large, the input voltage Vr ═ Vi + Vf at the inverting input terminal of the second operational amplifier increases, after comparing with the reference voltage Vg of the non-inverting input terminal of the second operational amplifier, the output voltage Ve of the second operational amplifier is reduced, meanwhile, the output voltage Ve of the second operational amplifier is fed back to the controller of the power conversion module 130, so that the output voltage Vo corresponding to the power conversion module 130 is decreased, thereby reducing the current Io output by the power conversion module 130 to the load device 170, realizing the adjustment of the current Io output by the power conversion module 130 to the load device 170, so that the current output from each power conversion module 130 to the load device 170 is equal, i.e. parallel current sharing is achieved.
Referring to fig. 1, the vehicle-mounted power supply system further includes: a filtering module 120, a plurality of voltage monitoring modules 140, and a plurality of anti-voltage-return modules 160; the input end of the filtering module 120 is connected to the power supply module 110, and the output end of the filtering module 120 is connected to the input ends of all the power conversion modules 130, so as to suppress common mode interference and differential mode interference of each power conversion module 130; each voltage monitoring module 140 is correspondingly connected to the output end of each power conversion module 130, and is configured to obtain output voltage data of each power conversion module 130; the input end of each of the anti-inverse-voltage modules 160 is correspondingly connected to the output end of each of the power conversion modules 130, and the output end of each of the anti-inverse-voltage modules 160 is connected to the load device 170, so as to prevent the voltage corresponding to the power conversion module 130 from flowing backwards.
It is understood that in some other embodiments, the number of the voltage monitoring modules 140 is the same as the number of the power conversion modules 130; the number of the anti-back-pressure modules 160 is the same as that of the power conversion modules 130.
Specifically, in the embodiment, the number of the voltage monitoring modules 140 and the back-pressure prevention modules 160 is two, that is, the voltage monitoring modules 140 and the back-pressure prevention modules 160 are all in one-to-one correspondence with the power conversion modules 130, but the invention is not limited thereto.
Referring to fig. 1 and fig. 3, the filtering module 120 includes: a filter; the input end of the filter is connected to the power supply module 110, and the output end of the filter is connected to the input ends of all the power conversion modules 130.
It is understood that in some other embodiments, the filtering module 120 further includes: a voltage dependent resistor and a transient voltage suppressor diode; one end of the piezoresistor is connected with the anode of the input end of the filter, and the other end of the piezoresistor is connected with the cathode of the input end of the filter; one end of the transient voltage suppression diode is connected with the anode of the output end of the filter, and the other end of the transient voltage suppression diode is connected with the cathode of the output end of the filter.
Specifically, the filter in the filtering module 120 may adopt an EMI filter, and the tvs D1 may adopt bidirectional tvs. The voltage dependent resistor RV1 and the transient voltage suppression diode D1 have good transient surge current absorption capability, and can protect elements or circuits in the power conversion module group, the current sharing module group, the voltage monitoring module 140, the back-voltage prevention module 160 and the load device 170 at the rear stage from being damaged by surge current. The filter can reduce common mode interference and differential mode interference of each power conversion module 130, thereby preventing electromagnetic interference from being transmitted to other modules through power lines, and simultaneously suppressing electromagnetic interference from a power grid. Preferably, the housing of the filter may be connected to the metal housing by a short wire, so that the input end and the output end of the filter may be directly shielded and isolated by the metal housing, but the invention is not limited thereto.
More specifically, in this embodiment, a circuit formed by the voltage dependent resistor RV1, the filter, and the tvs D1 in the filtering module 120 is shown in fig. 3; the filter comprises a common-mode inductor FL1, a differential-mode inductor L1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a first resistor R1, a second resistor R2 and a third resistor R3. In the filter, a first end of the first capacitor C1 is connected with a pin 1 of the common-mode inductor FL1, and a second end of the first capacitor C1 is grounded; the first end of the second capacitor C2 is connected with the 3 pins of the common-mode inductor FL1, and the second end is grounded; one end of the third capacitor C3 is connected to pin 1 of the common mode inductor FL1, and the other end is connected to pin 3 of the common mode inductor FL 1; a first end of the first resistor R1 is connected with the 2-pin of the common-mode inductor FL1, and a second end of the first resistor R1 is connected with a first end of the second resistor R2; a second end of the second resistor R2 is connected with the 4-pin of the common-mode inductor FL 1; the first end of the fourth capacitor C4 is connected with the 2-pin of the common-mode inductor FL1, and the second end is grounded; the first end of the fifth capacitor C5 is connected with the 4 pins of the common-mode inductor FL1, and the second end is grounded; one end of the sixth capacitor C6 is connected to pin 2 of the common mode inductor FL1, and the other end is connected to pin 4 of the common mode inductor FL 1; two ends of the seventh capacitor C7 are connected in parallel with two ends of the sixth capacitor C6; a first end of the eighth capacitor C8 is connected to the 2-pin of the common mode inductor FL1 after passing through the differential mode inductor L1, and a second end is connected to the 4-pin of the common mode inductor FL 1; two ends of the third resistor R3 are connected in parallel with two ends of the differential mode inductor L1. Preferably, the sixth capacitor C6 may adopt a polar capacitor; a first terminal of the first capacitor C1 and a first terminal of the second capacitor C2 constitute input terminals of the filter; the first terminal and the second terminal of the eighth capacitor C8 constitute the output terminal of the filter.
A first end of the piezoresistor RV1 is connected with a first end of the first capacitor C1 (namely, the anode of the input end of the filter), and a second end of the piezoresistor RV1 is connected with a first end of the second capacitor C2 (the cathode of the input end of the filter); a first terminal of the tvs D1 is connected to the first terminal of the eighth capacitor C8 (the positive terminal of the output terminal of the filter), and a second terminal of the tvs D1 is connected to the second terminal of the eighth capacitor C8 (the negative terminal of the output terminal of the filter); the first end and the second end of the voltage dependent resistor RV1 may form an input end of the filtering module 120, and are connected to the power supply module 110; the first terminal and the second terminal of the tvs D1 may form an output terminal of the filtering module 120, and are connected to the input terminals of all the power conversion modules 130.
With continued reference to fig. 1, each of the voltage monitoring modules includes: a voltage acquisition device 1401 and an indicator lamp 1402; the input end of the voltage acquisition device 1401 is correspondingly connected with the output end of each power conversion module 130, and the output end of the voltage acquisition device 1401 is connected with the indicator 1402; and the voltage collecting device 1401 controls the indicator 1402 to light up according to the output voltage data corresponding to the power conversion module 130 and a preset voltage monitoring range.
Specifically, if the output voltage data of the power conversion module 130 is within the preset voltage monitoring range, the voltage acquisition device 1401 may transmit the output voltage data signal of the voltage conversion module 130 to the indicator 1402 through a lighting circuit and control the indicator 140 to light up a green light; if the output voltage data of the power conversion module 130 is not within the preset voltage monitoring range, the voltage acquisition device 1401 may control the red light corresponding to the indicator 1402 to be turned on, and may also control the preset output circuit at the output end of the power conversion module 130 to be turned off, that is, the output of the power conversion module 130 is cut off, so as to perform short-circuit protection, overcurrent protection, and the like on the power conversion module 130; the voltage monitoring module 140 monitors the output voltage of the power conversion module 130, which is helpful for determining whether the operating state of the power conversion module 130 is normal. Preferably, when the working voltage of the load device 170 is 24V, the voltage acquisition device 1401 may adopt an ADC sampling chip, and the preset voltage monitoring range is 24V ± 10%; when the working voltage of the load device 170 is 12V, the voltage collecting device 1401 may adopt a voltage controller, and the preset voltage monitoring range is 12V ± 10%, but the invention is not limited thereto.
In this embodiment, if the number of the voltage monitoring modules 140 is two, the number of the voltage collecting device 1401 and the number of the indicator lamps 1402 are both two. All the indicator lamps 1402 can be LED lamps, and are disposed on the indicator lamp panel of the urban rail transit vehicle, and are powered by the power supply module 110.
Referring to fig. 1, the output voltage of the power conversion module 130 is 24V, and each of the anti-reverse voltage modules 160 is a diode; the output voltage of the power conversion module 130 is 12V, and each of the anti-back-voltage modules 160 is an MOS transistor.
Specifically, in this embodiment, when the output voltage of the power conversion module 130 is 24V, and the derating requirement is considered, the rated output power of the power conversion module 130 is set to 150W, the rated output current is set to 6.75A, at this time, the corresponding anti-back-voltage module 160 adopts the diode to prevent the voltage from flowing back, so as to avoid the phenomenon that the power conversion module 130 is burned, wherein I of the diode isF＝10A，VF0.453V; preferably, a pull-up resistor or a pull-down resistor may be added to a preset voltage-regulating pin of the output end of the power conversion module 130 to regulate the output voltage of the power conversion module 130 by ± 10%, so as to equalize the voltage drop generated by the diode; pull-up resistor resistance Ru ═ 1000 (V)OUT-1.23)VNOM/1.23(VOUT-VNOM) -1000; pull-down resistor resistance value Rd 1000VOUT/(VNOM-VOUT) (ii) a Wherein, VOUTIs the output voltage, V, of the power conversion module 130NOMIs an output representative value of the power conversion module 130. When the output voltage of the power conversion module 130 is 12V, the rated output current of the power conversion module 130 is set to 12.5A, and at this time, the corresponding anti-back-pressure module 160 can prevent the voltage from flowing backwards by using the MOS transistor; because the MOS tube has the parasitic diode, the MOS tube can counteract the influence of the parasitic diode in a back-to-back mode, and meanwhile, the on-off of the MOS tube can be controlled by a driving circuit of an integrated chip of the voltage controller.
In other embodiments, a soft start circuit, an input under-voltage protection circuit, and the like may be further disposed at the input end of the power conversion module 130 to further improve the input performance of the power conversion module 130, so as to improve the reliability of the vehicle-mounted power supply system.
In summary, in the vehicle-mounted power supply system provided in this embodiment, the power conversion module set may perform conversion processing on the power supply voltage provided by the power supply module according to the working voltage of the load device on the vehicle and output the power supply voltage, and the power conversion module set includes at least two power conversion modules for performing parallel redundant backup; the current equalizing module group can adjust the output voltage of the power supply conversion module group, so that the current flowing through the current equalizing module group to the load equipment is equal, namely, the parallel current equalizing of the power supply conversion modules is realized, the heat loss difference of the power supply conversion modules caused by the unequal power is avoided, the service life of the power supply conversion modules is prolonged, and the safety of a vehicle-mounted power supply system is further improved. According to the vehicle-mounted power supply system provided by the embodiment, the influence of electromagnetic interference on the input end of the power supply conversion module can be reduced through the filtering module, the collection and monitoring of the output voltage of the power supply conversion module are realized through the voltage monitoring module, the voltage reverse filling of the power supply conversion module is prevented through the reverse voltage prevention module, and the reliability of the vehicle-mounted power supply system is greatly improved.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. An on-vehicle power supply system, characterized by comprising:
a power supply module (110) for outputting a supply voltage;
the power supply conversion module group is connected with the power supply module (110) and used for converting and outputting the power supply voltage according to the working voltage of load equipment (170) on the vehicle; and
and one end of the current equalizing module group is connected with the power supply conversion module group, and the other end of the current equalizing module group is connected with the load equipment (170) and is used for adjusting the output voltage of the power supply conversion module group so as to enable the current flowing through the current equalizing module group to be equal to the current flowing through the load equipment (170).
2. The vehicle power supply system according to claim 1,
the power conversion module group comprises at least two power conversion modules (130) for parallel redundancy backup;
the current equalizing module group comprises a plurality of current equalizing modules (150), and the number of the current equalizing modules (150) is the same as that of the power supply conversion modules (130);
the input end of each power supply conversion module (130) is connected with the power supply module (110); the output end of each power supply conversion module (130) is correspondingly connected with the input end of each current equalizing module (150); and the output end of each current equalizing module (150) is connected with the load equipment (170).
3. The vehicle power supply system according to claim 2,
each current-sharing module (150) comprises a current-sharing circuit, and the current-sharing circuits are arranged by adopting a droop method.
4. The vehicle power supply system according to claim 1, further comprising: the device comprises a filtering module (120), a plurality of voltage monitoring modules (140) and a plurality of anti-back-pressure modules (160);
the input end of the filtering module (120) is connected with the power supply module (110), and the output end of the filtering module (120) is connected with the input ends of all the power conversion modules (130) and is used for suppressing common mode interference and differential mode interference of each power conversion module (130);
each voltage monitoring module (140) is correspondingly connected with the output end of each power supply conversion module (130) and is used for acquiring the output voltage data of each power supply conversion module (130);
the input end of each anti-back-pressure module (160) is correspondingly connected with the output end of each power conversion module (130), and the output end of each anti-back-pressure module (160) is connected with the load equipment (170) and used for preventing voltage corresponding to the power conversion module (130) from flowing backwards.
5. The vehicle power supply system according to claim 4,
the number of the voltage monitoring modules (140) is the same as that of the power conversion modules (130);
the number of the anti-back-pressure modules (160) is the same as that of the power conversion modules (130).
6. The vehicle power supply system of claim 4, characterized in that the filtering module (120) comprises: a filter; the input end of the filter is connected with the power supply module (110), and the output end of the filter is connected with the input ends of all the power supply conversion modules (130).
7. The vehicle power supply system of claim 6, wherein the filtering module (120) further comprises: a voltage dependent resistor and a transient voltage suppressor diode;
one end of the piezoresistor is connected with the anode of the input end of the filter, and the other end of the piezoresistor is connected with the cathode of the input end of the filter;
one end of the transient voltage suppression diode is connected with the anode of the output end of the filter, and the other end of the transient voltage suppression diode is connected with the cathode of the output end of the filter.
8. The vehicle power supply system according to claim 4, wherein each of the voltage monitoring modules comprises: a voltage acquisition device (1401) and an indicator lamp (1402);
the input end of the voltage acquisition device (1401) is correspondingly connected with the output end of each power supply conversion module (130), and the output end of the voltage acquisition device (1401) is connected with the indicator lamp (1402); and the voltage acquisition device (1401) controls the indicator lamp (1402) to light up according to the output voltage data corresponding to the power conversion module (130) and a preset voltage monitoring range.
9. The vehicle power supply system according to claim 4,
the output voltage of the power supply conversion module (130) is 24V, and each anti-reverse-voltage module (160) is a diode;
the output voltage of the power supply conversion module (130) is 12V, and each anti-back-pressure module (160) is an MOS tube.
10. The vehicle-mounted power supply system according to any one of claims 1 to 9,
the power supply voltage output by the power supply module (110) is direct current voltage; and each of the power conversion modules (130) is a DC/DC converter.
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