CN113890178B - A novel multi-source power supply system and method for vaccination vehicles - Google Patents
A novel multi-source power supply system and method for vaccination vehicles Download PDFInfo
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- CN113890178B CN113890178B CN202111293832.3A CN202111293832A CN113890178B CN 113890178 B CN113890178 B CN 113890178B CN 202111293832 A CN202111293832 A CN 202111293832A CN 113890178 B CN113890178 B CN 113890178B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明涉及一种新型疫苗接种车多源供电系统及方法，系统包括：电源模块、控制模块、稳压滤波电路以及接触器；所述电源模块包括市电、动力电池组以及蓄电池；所述接触器包括第一接触器、第二接触器以及第三接触器；所述市电、所述第一接触器、所述稳压滤波电路、所述第三接触器以及负载设备依次连接；所述动力电池组、所述第二接触器以及所述第三接触器依次连接；所述蓄电池与所述第三接触器连接；所述控制模块分别与所述第一接触器、所述第二接触器以及所述第三接触器连接；所述控制模块还分别与所述市电的输出端、所述稳压滤波电路的输出端以及负载连接。本发明提高了移动预防接种车供电稳定性以及供电效率。
The present invention relates to a novel multi-source power supply system and method for a vaccination vehicle, the system comprising: a power module, a control module, a voltage stabilizing filter circuit and a contactor; the power module comprises a mains power supply, a power battery pack and a storage battery; the contactor comprises a first contactor, a second contactor and a third contactor; the mains power supply, the first contactor, the voltage stabilizing filter circuit, the third contactor and a load device are connected in sequence; the power battery pack, the second contactor and the third contactor are connected in sequence; the storage battery is connected to the third contactor; the control module is respectively connected to the first contactor, the second contactor and the third contactor; the control module is also respectively connected to the output end of the mains power supply, the output end of the voltage stabilizing filter circuit and the load. The present invention improves the power supply stability and efficiency of the mobile vaccination vehicle.
Description
Technical Field
The invention relates to the field of power supply systems, in particular to a novel multi-source power supply system and method of a vaccination vehicle.
Background
Vaccination efforts are being accelerated due to outbreaks of epidemic situations and vaccine research into the market. In order to strengthen the inoculation service capability, the people meeting the conditions are ensured to be inoculated in time, and the mobile preventive inoculation vehicle is arranged in a region with large people flow or a rural area, so that long-acting power supply or emergency power supply is required for a vehicle-mounted vaccine refrigerator, a computer and the like, and the continuous stability and safety of a vaccine storage and monitoring system are ensured. The existing mobile vaccination vehicle is powered by mains supply, the power supply type is single, the electric quantity of a standby power supply is too small, stable power supply cannot be realized, a long-acting power supply is in an idle running state for a long time, and the power supply efficiency is low.
Disclosure of Invention
The invention aims to provide a novel multi-source power supply system and method for a vaccination vehicle, which are used for solving the problems of unstable power supply and low efficiency of the conventional mobile vaccination vehicle.
In order to achieve the above object, the present invention provides the following solutions:
the novel multi-source power supply system of the vaccination vehicle comprises a power supply module, a control module, a voltage stabilizing filter circuit and a contactor, wherein the power supply module comprises mains supply, a power battery pack and a storage battery;
the power supply, the first contactor, the voltage stabilizing filter circuit, the third contactor and the load equipment are sequentially connected, wherein the power supply is used as a main power supply to supply power to the load equipment;
The power battery pack, the second contactor and the third contactor are sequentially connected, and the power battery pack is used as an auxiliary power supply for supplying power to load equipment;
the storage battery is used as a standby power supply for supplying power to the load equipment and is also used for storing redundant electric energy generated by the power battery pack and redundant electric energy generated by the commercial power;
The control module is respectively connected with the first contactor, the second contactor and the third contactor, is also respectively connected with the output end of the mains supply, the output end of the voltage stabilizing filter circuit and the load, and is used for detecting a first voltage signal of the output end of the mains supply and a third voltage signal of the output end of the voltage stabilizing filter circuit, controlling the on-off of the first contactor according to the first voltage signal, controlling the on-off of the third contactor according to the third voltage signal and controlling the on-off of the second contactor according to the current flowing into load equipment.
Optionally, the device further comprises a current detector, wherein the current detector is respectively connected with the third contactor and the load equipment;
the current detector is used for detecting current flowing into the load equipment.
Optionally, the control module comprises a detection unit and a control unit, wherein the detection unit is connected with the control unit;
the detection unit is used for processing the first voltage signal to generate a first control signal, processing the third voltage signal to generate a third control signal and processing the current signal to generate a second control signal;
The control unit is respectively connected with the first contactor, the second contactor and the third contactor, is used for controlling the first contactor to be closed according to the first control signal and controlling the third contactor to be closed according to the third control signal, and is used for controlling the first contactor or the second contactor to be opened according to the second control signal.
Optionally, the power module further comprises a bypass input circuit and a manual maintenance switch;
The bypass input circuit is connected with the current detector through the manual maintenance switch, and is used for supplying power to the load equipment through the bypass input circuit when the novel multi-source power supply system of the vaccination car maintains or replaces the storage battery and the load equipment cannot interrupt power supply, and the manual maintenance switch is used for manually switching the bypass input circuit.
Optionally, the control module is further configured to detect a voltage of each branch, and determine whether an electrical device of each branch works normally.
Optionally, the system further comprises a bidirectional inverter and an inverter;
The input end of the bidirectional inverter is connected with the storage battery, and the output end of the bidirectional inverter is respectively connected with the third contactor and the inverter;
The inverter is used for inverting the direct-current voltage of the power battery pack into alternating-current voltage required by the load equipment;
the bidirectional inverter is used for detecting whether the load equipment is connected with a power supply or not, and is also used for inverting the direct-current voltage of the storage battery into the alternating-current voltage required by the load equipment.
The intelligent monitoring and communication system comprises a computer, a control module, an intelligent monitoring and communication circuit, a control module and a control module, wherein the control module is connected with the computer through the intelligent monitoring and communication circuit;
The monitoring software in the computer monitors the running conditions of the novel multi-source power supply system and the power supply circuit of the vaccination car through the communication circuit, and records and prompts the power failure condition.
A novel multi-source power supply method for a vaccination vehicle, comprising:
When the load equipment needs to work, the utility power is accessed to supply power to the load equipment;
judging whether the load equipment starts working, if the load equipment does not start working, judging whether the mains supply is connected or suddenly disconnected or a circuit fails to obtain a first judging result;
If the first judgment result is that the mains supply is not connected or suddenly disconnected or the circuit fails, closing a second contactor, judging whether the bidirectional inverter detects the power input or not, and obtaining a second judgment result;
If the second judging result is that the bidirectional inverter does not detect the power input, the bidirectional inverter enters an inversion mode, and the storage battery supplies power to the load equipment;
judging whether the first current value or the second current value is larger than a minimum set value or not to obtain a third judging result;
when the third judging result is that the first current value or the second current value is smaller than or equal to the minimum set value, determining that no load equipment works, disconnecting a first contactor or a second contactor, and standing by the bidirectional inverter;
sending a wake-up signal to the bidirectional inverter at set time intervals to enable the bidirectional inverter to be in an inversion state, and supplying power to load equipment through a storage battery;
Obtaining a third current value flowing into load equipment, and judging whether the third current value is larger than a minimum current set value or not to obtain a fourth judgment result;
If the fourth judgment result is that the third current value is smaller than or equal to the minimum current set value, the load equipment is determined to work, the first contactor is closed, the load equipment is switched into the mains supply by the power supply of the storage battery or the second contactor is closed, the load equipment is switched into the power battery pack by the power supply of the storage battery, and if the fourth judgment result is that the third current value is smaller than or equal to the minimum current set value, the load equipment is determined not to work.
Optionally, when the load device needs to work, the method includes accessing the mains supply to supply power to the load device specifically:
Judging whether the voltage of the mains supply input end is larger than a set voltage value or not to obtain a fifth judging result;
if the fifth judgment result is that the first voltage signal is smaller than or equal to the first set voltage value, returning to the step of judging whether the voltage of the mains supply input end is larger than the set voltage value to obtain a fifth judgment result;
Judging whether a third voltage signal at the output end of the voltage stabilizing filter circuit is equal to a second set voltage value or not to obtain a sixth judging result;
And if the sixth judgment result is that the third voltage signal is larger or smaller than the second set voltage value, determining voltage stabilizing failure or circuit failure.
Optionally, when the bidirectional inverter detects the input of the mains supply or the power supply of the power battery pack, judging whether the third current value flowing into the load device is larger than the maximum current set value;
And if the third current value is smaller than or equal to the maximum current set value, the power supply of the commercial power or the power battery pack supplies power to the load equipment and simultaneously charges the storage battery.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
The invention supplies power to the load equipment through the commercial power, the power battery pack and the storage battery, wherein the main power supply source is the commercial power, and the commercial power is output to the load equipment through the voltage stabilizing filter circuit. The second power supply source is provided by the power battery pack, when the bidirectional inverter detects that no commercial power is input or the voltage of the storage battery is lower than the set voltage, the bidirectional inverter can send a power supply request to the control module, the control module receives the request and controls the second contactor to be closed, the power battery pack can supply power to the load equipment after the second contactor is closed, and meanwhile, the storage battery is charged, so that the uninterrupted power supply of the storage battery is ensured. When the bidirectional inverter does not detect the power input of the commercial power or the power battery pack, the storage battery is used for supplying power to the load equipment, so that the power supply stability and the power supply efficiency of the mobile vaccination car are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a novel multi-source power supply system for a vaccination vehicle according to the present invention;
FIG. 2 is a schematic diagram of a novel multi-source power supply system for a vaccination vehicle according to the present invention;
Fig. 3 is a flowchart of a novel multi-source power supply method for a vaccination vehicle.
The symbol is 1-commercial power, 2-power battery pack, 3-storage battery, 4-bypass input circuit, 5-control module, 6-voltage stabilizing filter circuit, 7-bi-directional inverter, 8-inverter, 9-current detector, 10-load device, 11-computer, 12-integrated circuit, PDU-power distribution unit, K1-first contactor, K2-second contactor, K3-third contactor, K4-manual maintenance switch, V1-first contactor input end voltage, V2-first contactor output end voltage, V3-third contactor input end voltage, V4-load device input end voltage, V5-second contactor input end voltage, V6-second contactor output end voltage, branch voltage where V7-storage battery is located, first contactor input end voltage, V2-first contactor output end voltage, and V8-bypass input branch voltage.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a novel multi-source power supply system and method for a vaccination vehicle, which are used for solving the problems of unstable power supply and low efficiency of the conventional mobile vaccination vehicle.
The invention provides a novel multi-source power supply control system for a vaccination vehicle, which takes commercial power as a main power supply, a power battery as an auxiliary power supply and a storage battery as a standby power supply, and can ensure long-term power supply of vehicle-mounted equipment and realize real-time intelligent monitoring.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 1 is a schematic diagram of a novel multi-source power supply system of a vaccination vehicle, and as shown in fig. 1, the system comprises a power supply module, a control module 5, a voltage stabilizing filter circuit 6 and a contactor, wherein the power supply module comprises a mains supply 1, a power battery pack 2 and a storage battery 3, and the contactor comprises a first contactor K1, a second contactor K2 and a third contactor K3. The contactor is closed and opened, and is controlled by the control module 5 according to the power-on logic, so that the on-off of the branch and the automatic switching from one path to the other path are realized, and the contactor is provided with adhesion detection and can be used for judging whether the contactor is effectively closed and opened.
The utility power 1, the first contactor K1, the voltage stabilizing and filtering circuit 6, the third contactor K3 and the load equipment 10 are sequentially connected, the utility power 1 is used as a main power supply to supply power to the load equipment 10, and the voltage stabilizing and filtering circuit 6 is used for stabilizing and filtering the voltage output by the utility power 1.
The power battery pack 2, the second contactor K2 and the third contactor K3 are connected in sequence, and the power battery pack 2 is used as an auxiliary power source to supply power to the load device 10.
The storage battery 3 is connected with the third contactor K3, and the storage battery 3 is used for supplying power to the load equipment 10 as a standby power supply and is also used for storing the surplus electric energy generated by the power battery pack 2 and the surplus electric energy generated by the commercial power 1. The storage battery 3 is a lithium ion storage battery and is used for storing electric energy, and is formed by connecting a plurality of batteries in series, and the capacity of the storage battery determines the power supply time of the storage battery. The quality of the performance and the quality of the storage battery 3 directly influences the quality of the whole power supply.
The control module 5 is respectively connected with the first contactor K1, the second contactor K2 and the third contactor K3, the control module 5 is also respectively connected with the output end of the mains supply 1, the output end of the voltage stabilizing filter circuit 6 and a load, the control module 5 is used for detecting a first voltage signal of the output end of the mains supply 1 and a third voltage signal of the output end of the voltage stabilizing filter circuit 6, controlling the on-off of the first contactor K1 according to the first voltage signal, controlling the on-off of the third contactor K3 according to the third voltage signal and controlling the on-off of the second contactor K2 according to the current flowing into the load equipment 10.
In one specific embodiment, the novel multi-source power supply system of the vaccination vehicle further comprises a current detector 9, wherein the current detector 9 is respectively connected with the third contactor K3 and the load device 10.
The current detector 9 is used for detecting the current flowing into the load device 10. The current detector 9 detects the working current of the load end and transmits a signal to the control module 5 through a hard wire, thereby judging that the load is not working.
In one specific embodiment, the control module 5 comprises a detection unit and a control unit, wherein the detection unit is connected with the control unit.
The detection unit is respectively connected with the current detector 9, the output end of the commercial power 1 and the output end of the voltage stabilizing filter circuit 6, and is used for processing the first voltage signal to generate a first control signal, processing the third voltage signal to generate a third control signal and processing the current signal to generate a second control signal. The control module 5 comprises a detection unit, a control unit and a monitoring alarm protection circuit. The detecting unit is used for processing the detected voltage and current, the control unit judges whether to control the on-off of the contactor and the work of other electric devices in the circuit according to the detection data, and the monitoring alarm protection circuit is provided with an overcurrent, overvoltage and no-load protection circuit, a battery voltage too low, a battery polarity and alternating current polarity detecting circuit, an indicator lamp and a loudspeaker alarm circuit.
The control unit is respectively connected with the first contactor K1, the second contactor K2 and the third contactor K3, and is used for controlling the first contactor K1 to be closed according to the first control signal and controlling the third contactor K3 to be closed according to the third control signal, and is used for controlling the first contactor K1 or the second contactor K2 to be opened according to the second control signal.
In one specific embodiment, the power module further comprises a bypass input circuit 4 and a manual maintenance switch K4, wherein the bypass input circuit 4 is connected with the current detector 9 through the manual maintenance switch K4, the bypass input circuit 4 is used for supplying power to the load equipment 10 through the bypass input circuit 4 when a novel multi-source power supply system of the vaccination car is used for maintaining or replacing the storage battery 3 and the load equipment 10 cannot interrupt power supply, and the manual maintenance switch K4 is used for manually switching the bypass input circuit 4.
In a specific embodiment, the control module 5 is further configured to detect voltages V1-V8 of each branch, and determine whether the electrical device of each branch is operating normally.
In one embodiment, the novel vaccination vehicle multi-source power supply system further comprises a bi-directional inverter 7 and an inverter 8. The input end of the bidirectional inverter 8 is connected with the storage battery 3, the output end of the bidirectional inverter 7 is respectively connected with the third contactor K3 and the inverter 8, and the output end of the inverter 8 is also connected with the third contactor K3.
The inverter 8 is used to invert the 450V-700V dc voltage of the power battery pack 2 to the ac voltage required by the load device 10.
The bidirectional inverter 7 is used for detecting whether the load device 10 is connected to a power supply or not, and is also used for inverting the direct-current voltage of the storage battery 3 into the alternating-current voltage required by the load device 10. The bidirectional inverter 7 is composed of an inverter, an ac charger, and a transfer relay. The automatic detection device can automatically detect whether a power supply is connected or not, can flow redundant current into the storage battery 3 when the mains supply 1 is connected, can be switched into an inversion state within 10ms when the mains supply 1 is not connected, inverts the voltage of the storage battery 3 into the voltage required by a load, and ensures that the load is not powered down when the mains supply 1 is disconnected.
In a specific embodiment, the novel multi-source power supply system of the vaccination vehicle further comprises an intelligent monitoring and communication circuit, and the control module 5 is connected with the computer 11 through the intelligent monitoring and communication circuit. The monitoring software in the computer 11 monitors the running conditions of the novel multi-source power supply system and the power supply circuit of the vaccination car through a communication circuit, records and prompts the power failure condition, and automatically processes the data retention and system protection during power failure.
Fig. 2 is a schematic diagram of a novel multi-source power supply system of a vaccination vehicle, as shown in fig. 2, when a load device 10 works, a main power supply source is that commercial power 1 is connected to a power supply module, and then the commercial power 1 is output to the load device 10 through a voltage stabilizing filter circuit 6. The second main power supply source is provided by the power battery pack 2, when the bidirectional inverter 7 detects that no commercial power 1 is input or the voltage of the storage battery 3 is lower than the set voltage, a power supply request is sent to the control module 5, the control module 5 receives the request and sends the request to the battery management system in the PDU (Power Distribution Unit ) through CAN communication to request to close the second contactor K2 of the battery cathode, the power battery pack 2 CAN provide direct-current voltage after the second contactor K2 is closed, the direct-current voltage is inverted into alternating-current voltage required by the load equipment 10 through the internal inverter 8, and meanwhile, the standby storage battery 3 is charged, so that the storage battery 3 is ensured to be continuously powered off. In fig. 2, the integrated circuit 12 includes a bidirectional inverter 7, a voltage stabilizing filter circuit 6, a current detector 9, and the like.
According to the invention, the power battery pack power supply of the vaccination vehicle is used as the second main power supply input, when the commercial power 1 is suddenly powered off or fails, the commercial power 1 is replaced to carry out load power supply, the electric quantity of the storage battery 3 is timely supplemented, and the problems that the electric quantity of the storage battery 3 is insufficient, long-term power supply cannot be carried out when the failure occurs and the like are avoided.
The bidirectional inverter 7 and the inverter 8 are adopted, so that the space and the cost are saved, the full-digital control is realized, and the integration level is high and the response is quick.
By using the current detector 9, the control module 5 judges the working condition of the electric equipment by detecting the current, and controls the inverter 8 to be in standby when the load equipment 10 does not work, and cuts off the power input, thereby saving the standby electric quantity and prolonging the service life of the load equipment.
The intelligent management mode of the computer is adopted, so that the main functions of centralized monitoring, centralized analysis, centralized data processing and the like of the long-acting power supply can be realized, the traditional personnel decentralized duty mode and management mode are changed, and the working efficiency is greatly improved.
Fig. 3 is a flowchart of a novel multi-source power supply method for a vaccination vehicle, which comprises the following steps:
step 301, when the load equipment needs to work, the utility power is accessed to supply power to the load equipment.
Step 302, judging whether the load equipment starts working, if not, executing step 303, and if so, executing step 304.
Step 303, judging whether the mains supply is connected or suddenly disconnected or the circuit fails, if yes, executing step 305, and if not, executing step 306.
Step 304, obtaining a first current value flowing into the load device.
Step 307, judging whether the first current value is larger than a minimum current set value, if yes, executing step 311, and if not, executing step 310.
Step 305, the second contactor K2 is closed, and it is determined whether the bi-directional inverter detects the power input, if yes, step 308 is executed, and if not, step 309 is executed.
Step 306, no action.
Step 308, obtaining a second current value flowing into the load equipment.
Step 312, judging whether the second current value is greater than a minimum current set value, if yes, executing step 314, and if not, executing step 315.
Step 309, the bidirectional inverter enters an inversion mode, and the storage battery supplies power to the load equipment.
Step 310, determining that the no-load equipment works, opening the first contactor, and standing the bidirectional inverter.
Step 311, determining that the loaded device is working.
Step 313, sending a wake-up signal to the bidirectional inverter at set time intervals to enable the bidirectional inverter to be in an inversion state, and supplying power to the load equipment through the storage battery.
Step 316, obtaining a third current value flowing into the load device, judging whether the third current value is larger than a minimum current set value, if yes, executing step 317, and if not, executing step 318.
Step 317, determining that load equipment is required to work, closing the first contactor, and switching the load equipment into mains supply by the storage battery.
Step 318, determining that no load device operation is required.
Step 314, determining that the loaded device is operating.
Step 315, determining that the no-load device is in operation, opening the second contactor, and standing the inverter and the bidirectional inverter.
And 319, sending a wake-up signal to the bidirectional inverter at set time intervals to enable the bidirectional inverter to be in an inversion state, and supplying power to load equipment through a storage battery.
Step 320, obtaining a third current value flowing into the load device, judging whether the third current value is larger than a minimum current set value, if yes, executing step 321, and if not, executing step 322.
And 321, determining that load equipment is required to work, closing the second contactor, and switching the load equipment into a power battery pack for power supply by the storage battery.
Step 322, determining that no load device operation is required.
In a specific embodiment, when the load device needs to work, the method accesses the mains supply to supply power to the load device specifically includes:
and judging whether the voltage of the mains supply input end is larger than a set voltage value or not to obtain a fifth judging result.
If not, returning to the step of judging whether the voltage of the mains supply input end is larger than the set voltage value to obtain a fifth judging result.
And judging whether a third voltage signal at the output end of the voltage stabilizing filter circuit is equal to a second set voltage value, if so, closing a third contactor, and if not, determining voltage stabilizing failure or circuit failure.
In one embodiment, when the bi-directional inverter detects a mains or power battery pack power input, it is determined whether the third current value flowing into the load device is greater than a maximum current set point.
If the power supply of the commercial power or the power battery pack does not charge the storage battery, and if the power supply of the commercial power or the power battery pack does not charge the storage battery, the power supply of the commercial power or the power battery pack supplies power to the load equipment and simultaneously charges the storage battery.
The working principle or working process of the novel multi-source power supply system of the vaccination vehicle is as follows:
the multi-source power supply includes mains power, a power battery pack, a storage battery, and a bypass input.
1. When the mains supply is supplied
The control module 5 detects that the voltage V1 at the input end of the mains supply is larger than the set value voltage, the contactor K1 is closed, after the mains supply initially stabilizes voltage to absorb part of power grid interference through the voltage stabilizing and filtering circuit, the contactor switch K3 is closed after the voltage at the end V3 is detected to be equal to the set voltage, and the contactor switch K3 is directly used for providing the load equipment, otherwise, voltage stabilization fails or the circuit fails. The current detected by the current detector 9 is transmitted to the control module 5 through a hard wire, and the detection unit in the control module 5 receives that the current detected by the current detector 9 is larger than the minimum set value Imin, which indicates that the load needs to work. If the detected current is smaller than the minimum set value Imin, the no-load equipment works, at the moment, the contactor switch K1 is opened and saves power, meanwhile, the bidirectional inverter enters a standby state, the control unit wakes up the bidirectional inverter at set time intervals and enters an inversion state, the voltage of the storage battery is inverted into power output required by a load, current detection is carried out to judge whether the load equipment is in a working state, if the load equipment is in the working state, the control module 5 closes the contactor K1, and the load power is switched into mains supply by the power supply of the storage battery. The detection unit can judge whether the contactor K1 is effectively opened and closed by comparing the voltage values of V1 and V2.
2. Power supply at input end of power battery pack
When the load equipment needs to work, the commercial power is not connected or suddenly cut off or fails, the control module 5 immediately closes the K2 contactor and wakes up the inverter, the inverter converts the direct current of the power battery into alternating current required by the load equipment, and the power battery pack replaces the commercial power to supply power to the load and charge the standby battery. If the current detected by the checking unit is smaller than the minimum set value Imin, the no-load equipment works, at the moment, the contactor switch K2 is opened and power is saved, meanwhile, the inverter and the bidirectional inverter enter a standby state, the control unit wakes up the bidirectional inverter at set time intervals and enters an inversion state, the voltage of the storage battery is inverted into power output required by the load, current detection is carried out to judge whether the load equipment is in a working state, if the load equipment is in the working state, the control module 5 closes the contactor K2 and wakes up the inverter, and the load power is supplied by the storage battery and is switched into a power battery pack for supplying power. The detection unit can judge whether the contactor K1 is effectively opened and closed by comparing the voltage values of V5 and V6.
In addition, when the bidirectional inverter detects that the mains supply or the power battery pack passes through, the internal transfer relay of the bidirectional inverter can be immediately conducted so as to charge the storage battery, and at the moment, the storage battery is in a charging state until the storage battery is full and is converted into a floating charging state. The bi-directional inverter will preferentially power the load and the excess energy charges the battery. If the load current is greater than the set current value Imxa, the bi-directional inverter directly feeds power to the main circuit to supply power to the load without charging the storage battery.
3. Power supply from the input end of the storage battery
When the load equipment needs to work, the bidirectional inverter does not detect an input power supply, the bidirectional inverter is in an inversion mode rapidly, the storage battery discharges, the bidirectional inverter converts direct current of the storage battery into alternating current required by the load, and the power supply system converts the direct current into the storage battery-the bidirectional inverter to continuously supply power to the load.
If the battery feeds, or the bidirectional inverter detects that the voltage of the battery drops to the set point, a signal request is sent to the control module 5, the module receives the request and then closes the contactor K2, the inverter converts the direct current of the power battery pack into the alternating current required by the load, and at the moment, the power battery pack is charged by the electric storage standby battery, so that the battery feeding is prevented from damaging the battery, and serious occurrence of the load caused by power failure is avoided. The power battery pack can also be used for supplying electricity to the storage battery in real time.
4. Bypass maintenance input
When the multi-source power supply system needs to maintain or replace the storage battery and the power supply of the load cannot be interrupted, the two-way inverter switch can be cut off, then the maintenance bypass switch is put into operation, and then other switches are cut off. The alternating current power supply continues to supply alternating current to the load through the maintenance bypass switch, and maintenance personnel can safely maintain the multi-source power supply system.
The control and detection module can judge the voltage and current conditions of each branch circuit according to the detection values of V1-V8, and can judge whether the electric device of each branch circuit works normally or not.
In addition, the computer 11 is used as a monitoring platform, and the display of each detection parameter, the recording of the running state and the automatic warning lamp are realized through a software and hardware system. The monitoring module is selected to have a standard RS-232 serial interface, one end of the signal wire is connected with the communication interface of the monitoring module, and the other end is connected with a communication network formed by the computer 11, so that data transmission between the monitoring host and the monitoring module is realized.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to facilitate an understanding of the principles and concepts of the invention and are to be varied in scope and detail by persons of ordinary skill in the art based on the teachings herein. In view of the foregoing, this description should not be construed as limiting the invention.
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