A novel multi-source power supply system and method for vaccination vehicles

Abstract

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

[0001] The present invention relates to the field of power supply systems, and in particular to a novel multi-source power supply system and method for a vaccination vehicle. Background Art

[0002] Due to the outbreak of the epidemic in various countries and the launch of vaccine research, vaccination work is being accelerated. In order to strengthen the vaccination service capacity and ensure that eligible people are vaccinated in time, mobile vaccination vehicles will appear in areas with large flow of people or in rural areas, so long-term power supply or emergency power supply is required for on-board vaccine refrigerators, computers, etc. to ensure the continuous stability and safety of vaccine storage and monitoring systems. Existing mobile vaccination vehicles are all powered by AC power, with a single power supply type, and the backup power supply is too small to provide stable power supply. The long-term power supply is in a no-load operation state for a long time, and the power supply efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to provide a novel multi-source power supply system and method for a vaccination vehicle, so as to solve the problems of unstable power supply and low efficiency of the existing mobile vaccination vehicles.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A novel multi-source power supply system for a vaccination vehicle, 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;

[0006] The mains, the first contactor, the voltage stabilizing filter circuit, the third contactor and the load device are connected in sequence; the mains serves as a main power source to supply power to the load device; the voltage stabilizing filter circuit is used to perform voltage stabilizing and filtering on the voltage output by the mains;

[0007] The power battery pack, the second contactor and the third contactor are connected in sequence; the power battery pack serves as an auxiliary power source to supply power to the load device;

[0008] The storage battery is connected to the third contactor; the storage battery is used to supply power to the load device as a backup power source, and is also used to store excess electric energy generated by the power battery pack and excess electric energy generated by the mains;

[0009] The control module is connected to the first contactor, the second contactor and the third contactor respectively; the control module is also connected to the output end of the AC power, the output end of the voltage stabilizing filter circuit and the load respectively; the control module is used to detect the first voltage signal at the output end of the AC power and the third voltage signal at the output end of the voltage stabilizing filter circuit, and control the on and off of the first contactor according to the first voltage signal; control the on and off of the third contactor according to the third voltage signal, and control the on and off of the second contactor according to the current flowing into the load device.

[0010] Optionally, it further includes a current detector; the current detector is connected to the third contactor and the load device respectively;

[0011] The current detector is used to detect the current flowing into the load device.

[0012] Optionally, the control module includes: a detection unit and a control unit; the detection unit is connected to the control unit;

[0013] The detection unit is respectively connected to the current detector, the output end of the mains power supply and the output end of the voltage stabilizing filter circuit; the detection unit is used to process the first voltage signal to generate a first control signal, process the third voltage signal to generate a third control signal, and process the current signal to generate a second control signal;

[0014] The control unit is connected to the first contactor, the second contactor and the third contactor respectively; the control unit is used to control the first contactor to close according to the first control signal, and to control the third contactor to close according to the third control signal; the control unit is used to control the first contactor or the second contactor to open according to the second control signal.

[0015] Optionally, the power module further includes: a bypass input circuit and a manual maintenance switch;

[0016] The bypass input circuit is connected to the current detector through the manual maintenance switch; the bypass input circuit is used to power the load equipment through the bypass input circuit when the multi-source power supply system of the new vaccination vehicle is repaired or the battery is replaced and the load equipment cannot interrupt power supply; the manual maintenance switch is used to manually switch the bypass input circuit.

[0017] Optionally, the control module is also used to detect the voltage of each branch to determine whether the electrical components of each branch are working normally.

[0018] Optionally, a bidirectional inverter and an inverter are also included;

[0019] The input end of the bidirectional inverter is connected to the battery, and the output end of the bidirectional inverter is connected to the third contactor and the inverter respectively; the output end of the inverter is also connected to the third contactor;

[0020] The inverter is used to invert the DC voltage of the power battery pack into the AC voltage required by the load device;

[0021] The bidirectional inverter is used to detect whether the load device is connected to a power source, and is also used to invert the DC voltage of the battery into the AC voltage required by the load device.

[0022] Optionally, it also includes an intelligent monitoring and communication circuit; the control module is connected to the computer through the intelligent monitoring and communication circuit;

[0023] The monitoring software in the computer monitors the operation of the multi-source power supply system and power supply lines of the new vaccination vehicle through communication lines, and records and prompts power outages.

[0024] A novel multi-source power supply method for a vaccination vehicle, comprising:

[0025] When the load equipment needs to work, it is connected to the mains to supply power to the load equipment;

[0026] Determine whether the load device starts working. If the load device does not start working, determine whether the mains power is connected or suddenly cut off or the circuit fails, and obtain a first determination result; if the load device starts working, obtain a first current value flowing into the load device;

[0027] If the first judgment result is that the mains power is not connected or suddenly cut off or the circuit is faulty, close the second contactor to determine whether the bidirectional inverter detects power input, and obtain the second judgment result; if the first judgment result is that the mains power is connected or not cut off or the circuit is not faulty, do nothing;

[0028] If the second judgment result is that the bidirectional inverter detects power input, a second current value flowing into the load device is obtained; if the second judgment result is that the bidirectional inverter does not detect power input, the bidirectional inverter enters an inverter mode, and the battery supplies power to the load device;

[0029] Determine whether the first current value or the second current value is greater than a minimum set value, and obtain a third determination result;

[0030] When the third judgment result is that the first current value or the second current value is greater than the minimum setting value, it is determined that the load device is working; when the third judgment result is that the first current value or the second current value is less than or equal to the minimum setting value, it is determined that no load device is working, the first contactor or the second contactor is disconnected, and the bidirectional inverter is in standby mode;

[0031] Sending a wake-up signal to the bidirectional inverter at a set time interval, so that the bidirectional inverter is in an inverter state, and supplying power to the load device through the battery;

[0032] Obtaining a third current value flowing into the load device, determining whether the third current value is greater than a minimum current setting value, and obtaining a fourth determination result;

[0033] If the fourth judgment result is that the third current value is greater than the minimum current setting value, it is determined that the load device needs to work, the first contactor is closed, and the load device is powered by the battery and switched to the AC power supply, or the second contactor is closed, and the load device is powered by the battery and switched to the power battery pack; if the fourth judgment result is that the third current value is less than or equal to the minimum current setting value, it is determined that the load device does not need to work.

[0034] Optionally, when the load device needs to work, connecting to the mains to power the load device specifically includes:

[0035] Determine whether the voltage at the mains input terminal is greater than a set voltage value, and obtain a fifth determination result;

[0036] If the fifth judgment result is that the first voltage signal is greater than the first set voltage value, close the first contactor; if the fifth judgment result is that the first voltage signal is less than or equal to the first set voltage value, return to the step of "determining whether the voltage at the mains input terminal is greater than the set voltage value to obtain the fifth judgment result";

[0037] Determine whether the third voltage signal at the output end of the voltage stabilizing filter circuit is equal to the second set voltage value to obtain a sixth determination result;

[0038] If the sixth judgment result is that the third voltage signal is equal to the second set voltage value, the third contactor is closed; if the sixth judgment result is that the third voltage signal is greater than or less than the second set voltage value, it is determined that the voltage regulation fails or the circuit fails.

[0039] Optionally, when the bidirectional inverter detects the power input of the mains or the power battery pack, it is determined whether the third current value flowing into the load device is greater than the maximum current setting value;

[0040] If the third current value is greater than the maximum current setting value, the AC power or the power battery pack's power supply does not charge the battery; if the third current value is less than or equal to the maximum current setting value, the AC power or the power battery pack's power supply charges the battery while supplying power to the load device.

[0041] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0042] The present invention supplies power to the load device through the mains, a power battery pack and a storage battery. The main power source is the mains, and the mains is output to the load device through a voltage stabilizing filter circuit. The second power source is provided by the power battery pack. When the bidirectional inverter detects that there is no mains input or the battery voltage is lower than the set voltage, it will send a power request to the control module. The control module receives the request and controls the second contactor to close. After the second contactor is closed, the power battery pack can supply power to the load device and charge the storage battery at the same time to ensure that the storage battery is not disconnected. When the bidirectional inverter does not detect the power input of the mains or the power battery pack, the load device is powered by the storage battery, which improves the power supply stability and power supply efficiency of the mobile vaccination vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 A schematic diagram of a new multi-source power supply system for a vaccination vehicle provided by the present invention;

[0045] Figure 2 A schematic diagram of a new multi-source power supply system for a vaccination vehicle provided by the present invention;

[0046] Figure 3 This is a flow chart of a new multi-source power supply method for a vaccination vehicle provided by the present invention.

[0047] Explanation of symbols: 1-mains power; 2-power battery pack; 3-battery; 4-bypass input circuit; 5-control module; 6-voltage stabilizing filter circuit; 7-bidirectional inverter; 8-inverter; 9-current detector; 10-load equipment; 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 voltage; V2-first contactor output voltage; V3-third contactor input voltage; V4-load equipment input voltage; V5-second contactor input voltage; V6-second contactor output voltage; V7-battery branch voltage; first contactor input voltage; V2-first contactor output voltage; V8-bypass input branch voltage. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The purpose of the present invention is to provide a novel multi-source power supply system and method for a vaccination vehicle, so as to solve the problems of unstable power supply and low efficiency of the existing mobile vaccination vehicles.

[0050] The present invention provides a new type of multi-source power supply control system for a vaccination vehicle with AC power as the main power supply, a power battery as the auxiliary power supply, and a storage battery as the backup power supply, which ensures long-term power supply for on-board equipment and enables real-time intelligent monitoring.

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Figure 1 The schematic diagram of a novel multi-source power supply system for a vaccination vehicle provided by the present invention is as follows: Figure 1 As shown, the system includes: a power module, a control module 5, a voltage stabilizing filter circuit 6 and a contactor; the power module includes a mains 1, a power battery pack 2 and a storage battery 3; the contactor includes a first contactor K1, a second contactor K2 and a third contactor K3. The closing and opening of the contactor is controlled by the control module 5 according to the power-on logic, and its function is to realize the opening and closing of the branch and the automatic switching from one branch to another. It has its own adhesion detection, which can be used to determine whether the contactor is effectively closed and opened.

[0053] The mains 1, the first contactor K1, the voltage stabilizing filter circuit 6, the third contactor K3 and the load device 10 are connected in sequence; the mains 1 serves as the main power supply to supply power to the load device 10; the voltage stabilizing filter circuit 6 is used to stabilize and filter the voltage output by the mains 1.

[0054] The power battery pack 2 , the second contactor K2 , and the third contactor K3 are connected in sequence; the power battery pack 2 serves as an auxiliary power source to supply power to the load device 10 .

[0055] The battery 3 is connected to the third contactor K3; the battery 3 is used as a backup power source to supply power to the load device 10, and is also used to store the excess power generated by the power battery pack 2 and the excess power generated by the mains 1. The battery 3 is a lithium-ion battery used as a device for storing power. It is composed of a number of batteries connected in series, and its capacity determines its power supply time. The performance and quality of the battery 3 directly affect the quality of the entire power supply.

[0056] The control module 5 is connected to the first contactor K1, the second contactor K2 and the third contactor K3 respectively; the control module 5 is also connected to the output end of the AC power 1, the output end of the voltage stabilizing filter circuit 6 and the load respectively; the control module 5 is used to detect the first voltage signal at the output end of the AC power 1 and the third voltage signal at the output end of the voltage stabilizing filter circuit 6, and control the on and off of the first contactor K1 according to the first voltage signal; control the on and off of the third contactor K3 according to the third voltage signal, and control the on and off of the second contactor K2 according to the current flowing into the load device 10.

[0057] In a specific embodiment, the multi-source power supply system of the new vaccination vehicle also includes a current detector 9; the current detector 9 is connected to the third contactor K3 and the load device 10 respectively.

[0058] The current detector 9 is used to detect the current flowing into the load device 10. The current detector 9 detects the working current of the load end and transmits the signal to the control module 5 through the hard line, so as to determine whether the load is working.

[0059] In a specific implementation, the control module 5 includes: a detection unit and a control unit; the detection unit is connected to the control unit.

[0060] The detection unit is connected to the current detector 9, the output end of the AC power 1 and the output end of the voltage stabilizing filter circuit 6 respectively; the detection unit is used to process the first voltage signal to generate a first control signal, process the third voltage signal to generate a third control signal, and process the current signal to generate a second control signal. The control module 5 includes a detection unit, a control unit and a monitoring alarm protection circuit. The detection unit is used to process the detected voltage and current; the control unit determines whether to control the on and off of the contactor and other electrical components in the circuit according to the detection data; the monitoring alarm protection circuit is provided with overcurrent, overvoltage, no-load protection, low battery voltage, battery polarity and AC polarity detection circuit, indicator light and speaker alarm circuit.

[0061] The control unit is connected to the first contactor K1, the second contactor K2 and the third contactor K3 respectively; the control unit is used to control the first contactor K1 to close according to the first control signal, and to control the third contactor K3 to close according to the third control signal; the control unit is used to control the first contactor K1 or the second contactor K2 to open according to the second control signal.

[0062] In a specific embodiment, the power module also includes: a bypass input circuit 4 and a manual maintenance switch K4; the bypass input circuit 4 is connected to the current detector 9 through the manual maintenance switch K4; the bypass input circuit 4 is used to power the load device 10 through the bypass input circuit 4 when the multi-source power supply system of the new vaccination vehicle is repaired or the battery 3 is replaced and the load device 10 cannot interrupt the power supply; the manual maintenance switch K4 is used to manually switch the bypass input circuit 4.

[0063] In a specific implementation, the control module 5 is also used to detect the voltages V1-V8 of each branch to determine whether the electrical components of each branch are working normally.

[0064] In a specific embodiment, the multi-source power supply system of the new vaccination vehicle also includes a bidirectional inverter 7 and an inverter 8. The input end of the bidirectional inverter 8 is connected to the battery 3, and the output end of the bidirectional inverter 7 is respectively connected to the third contactor K3 and the inverter 8; the output end of the inverter 8 is also connected to the third contactor K3.

[0065] The inverter 8 is used to invert the 450V-700V DC voltage of the power battery pack 2 into the AC voltage required by the load device 10 .

[0066] The bidirectional inverter 7 is used to detect whether the load device 10 is connected to the power supply, and is also used to invert the DC voltage of the battery 3 into the AC voltage required by the load device 10. The bidirectional inverter 7 is composed of an inverter, an AC charger and a transfer relay. It can automatically detect whether there is a power supply connection. When the mains 1 is connected, the excess current can flow into the battery 3. When the mains 1 is not connected, it can switch to the inverter state within 10ms, invert the voltage of the battery 3 into the voltage required by the load, and ensure that the load does not lose power when the mains 1 is disconnected.

[0067] In a specific embodiment, the multi-source power supply system of the new vaccination vehicle also includes an intelligent monitoring and communication circuit; the control module 5 is connected to the computer 11 through the intelligent monitoring and communication circuit. The monitoring software in the computer 11 monitors the operation of the multi-source power supply system and power supply lines of the new vaccination vehicle through the communication line, records and prompts the power failure, and automatically handles the data retention and system protection during the power failure.

[0068] Figure 2 A schematic diagram of a new multi-source power supply system for a vaccination vehicle provided by the present invention is shown in FIG. Figure 2 As shown, when the load device 10 is working, the main power source is the mains 1 connected to the power module, and then output to the load device 10 through the voltage stabilizing filter circuit 6. The second main power source is provided by the power battery pack 2. When the bidirectional inverter 7 detects that there is no mains 1 input or the battery 3 voltage is lower than the set voltage, it will send a power request to the control module 5. The control module 5 receives the request and sends it to the battery management system in the PDU (Power Distribution Unit) through CAN communication to request the closing of the second contactor K2 at the negative pole of the battery. After the second contactor K2 is closed, the power battery pack 2 can provide a DC voltage, which is inverted into the AC voltage required by the load device 10 through the internal inverter 8, and the backup battery 3 is charged at the same time to ensure that the battery 3 is not disconnected. Figure 2 In the embodiment, the integrated circuit 12 includes a bidirectional inverter 7, a voltage stabilizing filter circuit 6, a current detector 9, and the like.

[0069] The present invention utilizes the power battery pack power supply of the vaccination vehicle as the second main power input, which replaces the mains 1 to supply power to the load and replenish the power of the battery 3 in time when the mains 1 suddenly loses power or fails, thereby avoiding problems such as insufficient power of the battery 3 and inability to provide long-term power supply when a failure occurs.

[0070] The bidirectional inverter 7 and the inverter 8 are used to save space and cost, and have full digital control, high integration and fast response.

[0071] Using the current detector 9, the control module 5 determines the working condition of the electrical equipment by detecting the current, and controls the inverter 8 to be in standby mode when the load device 10 is not working, disconnecting the power input, thereby saving standby power and extending its service life.

[0072] The computer intelligent management mode can realize the main functions of centralized monitoring, centralized analysis and centralized data processing of long-term power supply, change the traditional decentralized duty mode and management mode of personnel, and greatly improve work efficiency.

[0073] Figure 3 A flowchart of a novel multi-source power supply method for a vaccination vehicle provided by the present invention includes:

[0074] Step 301: When the load device needs to work, the mains is connected to supply power to the load device.

[0075] Step 302: Determine whether the load device starts working, if not, execute step 303; if yes, execute step 304.

[0076] Step 303: Determine whether the city power is connected or suddenly cut off or the circuit is faulty. If so, execute step 305; if not, execute step 306.

[0077] Step 304: Obtain a first current value flowing into the load device.

[0078] Step 307: Determine whether the first current value is greater than the minimum current setting value. If so, execute step 311; if not, execute step 310.

[0079] Step 305: close the second contactor K2 to determine whether the bidirectional inverter detects power input, if so, execute step 308; if not, execute step 309.

[0080] Step 306: No action.

[0081] Step 308: Obtain a second current value flowing into the load device.

[0082] Step 312: Determine whether the second current value is greater than the minimum current setting value. If so, execute step 314; if not, execute step 315.

[0083] Step 309: The bidirectional inverter enters the inverter mode, and the battery supplies power to the load device.

[0084] Step 310: Determine that no load device is operating, disconnect the first contactor, and put the bidirectional inverter into standby mode.

[0085] Step 311: Determine whether a load device is working.

[0086] Step 313: Send a wake-up signal to the bidirectional inverter at a set time interval, so that the bidirectional inverter is in an inverter state, and the load device is powered by the battery.

[0087] Step 316: Obtain a third current value flowing into the load device, and determine whether the third current value is greater than the minimum current setting value. If so, execute step 317; if not, execute step 318.

[0088] Step 317: It is determined that the load device needs to work, the first contactor is closed, and the load device is switched from being powered by the battery to being powered by the mains.

[0089] Step 318: Determine that the load device does not need to work.

[0090] Step 314: Determine whether a load device is working.

[0091] Step 315: Determine that no load device is operating, disconnect the second contactor, and put the inverter and the bidirectional inverter into standby mode.

[0092] Step 319: Send a wake-up signal to the bidirectional inverter at a set time interval, so that the bidirectional inverter is in an inverter state, and the load device is powered by the battery.

[0093] Step 320: Obtain a third current value flowing into the load device, and determine whether the third current value is greater than the minimum current setting value. If so, execute step 321; if not, execute step 322.

[0094] Step 321: Determine that the load device needs to work, close the second contactor, and switch the power supply of the load device from the storage battery to the power supply of the power battery pack.

[0095] Step 322: Determine that the load device does not need to work.

[0096] In a specific implementation, when the load device needs to work, connecting to the mains to power the load device specifically includes:

[0097] It is determined whether the voltage at the mains input terminal is greater than a set voltage value to obtain a fifth determination result.

[0098] If yes, close the first contactor; if no, return to the step of "determining whether the voltage at the AC input terminal is greater than the set voltage value to obtain the fifth determination result".

[0099] It is determined whether the third voltage signal at the output end of the voltage stabilizing filter circuit is equal to the second set voltage value. If so, the third contactor is closed; if not, it is determined that the voltage stabilization fails or the circuit fails.

[0100] In a specific implementation, when the bidirectional inverter detects the power input of the mains or the power battery pack, it is determined whether the third current value flowing into the load device is greater than the maximum current setting value.

[0101] If yes, the AC power or the power supply of the power battery pack does not charge the battery; if no, the AC power or the power battery pack charges the battery while supplying power to the load device.

[0102] The working principle or working process of the new multi-source power supply system for vaccination vehicles of the present invention is as follows:

[0103] Multi-source power supply includes AC power, power battery pack, storage battery and bypass input.

[0104] 1. When the mains power supply is

[0105] The control module 5 detects that the voltage V1 at the mains input terminal is greater than the set voltage, and closes the K1 contactor. After the mains absorbs part of the grid interference through the voltage stabilization filter circuit, the contactor switch K3 is closed after the voltage at the V3 terminal is detected to be equal to the set voltage. The contactor switch K3 is directly provided to the load device, otherwise the voltage stabilization fails or the circuit fails. The current detector 9 detects that the current is transmitted to the control module 5 through a hard line. The detection unit in the control module 5 receives the current detector 9 and detects that the current is greater than the minimum set value Imin, indicating that there is a load that needs to work. If the detected current is less than the minimum set value Imin, no load device is working. At this time, the contactor switch K1 is disconnected and power is saved. At the same time, the bidirectional inverter enters the standby state. The control unit wakes up the bidirectional inverter at a set time interval and enters the inverter state, inverts the battery voltage to the power output required by the load, and performs current detection to determine whether the load device is in a working state. If the load device is in a working state, the control module 5 closes the K1 contactor, and the load power supply is switched from the battery power supply to the mains power supply. The detection unit can determine whether the contactor K1 is effectively opened and closed by comparing the voltage values ​​of V1 and V2.

[0106] 2. Power supply from the power battery pack input terminal

[0107] When the load device needs to work, the mains is not connected or suddenly loses power or fails, the control module 5 will immediately close the K2 contactor and wake up the inverter. The inverter converts the DC power of the power battery into the AC power required by the load device, and the power battery pack replaces the mains to supply power to the load and charge the backup battery. If the current detected by the inspection unit is less than the minimum setting value Imin, no load device is working. At this time, the contactor switch K2 is disconnected and power is saved. At the same time, the inverter and the bidirectional inverter enter the standby state. The control unit wakes up the bidirectional inverter at a set time interval and enters the inverter state, inverts the battery voltage to the power output required by the load, and performs current detection to determine whether the load device is in working state. If the load device is in working state, the control module 5 closes the K2 contactor and wakes up the inverter, and the load power supply is switched from the battery to the power battery pack. The detection unit can determine whether the contactor K1 is effectively disconnected and closed by comparing the voltage values ​​of V5 and V6.

[0108] In addition, when the bidirectional inverter detects that the mains or power battery pack is passing through, the internal transfer relay of the bidirectional inverter will be turned on immediately to charge the battery. At this time, the battery is in a charging state until the battery is fully charged and turns into a floating charge state. The bidirectional inverter will give priority to powering the load, and the excess energy will be used to charge the battery. If the load current is greater than the set current value Imxa, the bidirectional inverter will feed the power directly to the main circuit to power the load, and will not charge the battery.

[0109] 3. Battery input power supply

[0110] When the load equipment needs to work, but the bidirectional inverter does not detect the input power, it quickly enters the inverter mode, the battery discharges, and the bidirectional inverter converts the DC power of the battery into the AC power required by the load. At this time, the power supply system is converted to battery-bidirectional inverter to continue to supply power to the load.

[0111] If the battery feeds power, or the bidirectional inverter detects that the battery voltage drops to the set point, it will send a signal request to the control module 5. After receiving the request, the module will close the contactor K2, and the inverter will convert the DC power of the power battery pack into the AC power required by the load. At this time, the power battery pack charges the backup battery to prevent the battery from being damaged by the battery feed and causing serious incidents due to power failure of the load. The power battery pack can also be used to replenish the battery in real time.

[0112] 4. Bypass maintenance input

[0113] When the multi-source power supply system needs to be repaired or the battery needs to be replaced and the load power supply cannot be interrupted, the bidirectional inverter switch can be turned off first, then the maintenance bypass switch can be turned on, and then the other switches can be turned off. The AC power supply continues to supply AC power to the load through the maintenance bypass switch, and the maintenance personnel can safely maintain the multi-source power supply system.

[0114] The control and detection module can determine the voltage and current conditions of each branch according to the detection values ​​of V1-V8, and thus determine whether the electrical components of each branch are working normally.

[0115] In addition, the computer 11 is used as the monitoring platform, and the software and hardware systems are used to realize the display of various detection parameters, operation status recording and automatic warning lights. The monitoring module is selected to have a standard RS-232 serial interface, one end of the signal line is connected to the monitoring module communication interface, and the other end is connected to the communication network formed by the computer 11 to realize data transmission between the monitoring host and the monitoring module.

[0116] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred 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 parts can be referred to the method part.

[0117] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A new type of multi-source power supply system for vaccination vehicles, characterized in that: include: A power module, a control module, a voltage stabilizing filter circuit and a contactor; the power module includes a mains supply, a power battery pack and a storage battery; the contactor includes a first contactor, a second contactor and a third contactor; The mains, the first contactor, the voltage stabilizing filter circuit, the third contactor and the load device are connected in sequence; the mains serves as a main power source to supply power to the load device; The voltage stabilizing and filtering circuit is used to perform voltage stabilizing and filtering on the voltage output by the mains power; The power battery pack, the second contactor and the third contactor are connected in sequence; the power battery pack serves as an auxiliary power source to supply power to the load device; The storage battery is connected to the third contactor; the storage battery is used to supply power to the load device as a backup power source, and is also used to store excess electric energy generated by the power battery pack and excess electric energy generated by the mains; The control module is connected to the first contactor, the second contactor and the third contactor respectively; the control module is also connected to the output end of the mains, the output end of the voltage stabilizing filter circuit and the load respectively; the control module is used to detect the first voltage signal at the output end of the mains and the third voltage signal at the output end of the voltage stabilizing filter circuit, and control the on and off of the first contactor according to the first voltage signal; Controlling the on and off of the third contactor according to the third voltage signal, and controlling the on and off of the second contactor according to the current flowing into the load device; The multi-source power supply system of the new vaccination vehicle is used to implement a multi-source power supply method for the new vaccination vehicle. The multi-source power supply method for the new vaccination vehicle specifically includes: When the load equipment needs to work, it is connected to the mains to supply power to the load equipment; Determine whether the load device starts working. If the load device does not start working, determine whether the mains power is connected or suddenly cut off or the circuit fails, and obtain a first determination result; if the load device starts working, obtain a first current value flowing into the load device; If the first judgment result is that the mains power is not connected or suddenly cut off or the circuit is faulty, close the second contactor to determine whether the bidirectional inverter detects power input, and obtain the second judgment result; if the first judgment result is that the mains power is connected or not cut off or the circuit is not faulty, do nothing; If the second judgment result is that the bidirectional inverter detects power input, a second current value flowing into the load device is obtained; if the second judgment result is that the bidirectional inverter does not detect power input, the bidirectional inverter enters an inverter mode, and the battery supplies power to the load device; Determine whether the first current value or the second current value is greater than a minimum set value, and obtain a third determination result; When the third judgment result is that the first current value or the second current value is greater than the minimum setting value, it is determined that the load device is working; when the third judgment result is that the first current value or the second current value is less than or equal to the minimum setting value, it is determined that no load device is working, the first contactor or the second contactor is disconnected, and the bidirectional inverter is in standby mode; Sending a wake-up signal to the bidirectional inverter at a set time interval, so that the bidirectional inverter is in an inverter state, and supplying power to the load device through the battery; Obtaining a third current value flowing into the load device, determining whether the third current value is greater than a minimum current setting value, and obtaining a fourth determination result; If the fourth judgment result is that the third current value is greater than the minimum current setting value, it is determined that the load device needs to work, the first contactor is closed, and the load device is powered by the battery and switched to the AC power supply, or the second contactor is closed, and the load device is powered by the battery and switched to the power battery pack; if the fourth judgment result is that the third current value is less than or equal to the minimum current setting value, it is determined that the load device does not need to work.

2. The multi-source power supply system for the new vaccination vehicle according to claim 1 is characterized in that: It also includes a current detector; the current detector is connected to the third contactor and the load device respectively; The current detector is used to detect the current flowing into the load device.

3. The multi-source power supply system for the new vaccination vehicle according to claim 2 is characterized in that: The control module comprises: a detection unit and a control unit; the detection unit is connected to the control unit; The detection unit is respectively connected to the current detector, the output end of the mains power supply and the output end of the voltage stabilizing filter circuit; the detection unit is used to process the first voltage signal to generate a first control signal, process the third voltage signal to generate a third control signal, and process the current signal to generate a second control signal; The control unit is connected to the first contactor, the second contactor and the third contactor respectively; the control unit is used to control the first contactor to close according to the first control signal, and to control the third contactor to close according to the third control signal; the control unit is used to control the first contactor or the second contactor to open according to the second control signal.

4. The multi-source power supply system for the new vaccination vehicle according to claim 3 is characterized in that: The power module also includes: a bypass input circuit and a manual maintenance switch; The bypass input circuit is connected to the current detector through the manual maintenance switch; the bypass input circuit is used to power the load equipment through the bypass input circuit when the multi-source power supply system of the new vaccination vehicle is repaired or the battery is replaced and the load equipment cannot interrupt power supply; the manual maintenance switch is used to manually switch the bypass input circuit.

5. The multi-source power supply system for the new vaccination vehicle according to claim 4 is characterized in that: The control module is also used to detect the voltage of each branch to determine whether the electrical components of each branch are working normally.

6. The multi-source power supply system for the new vaccination vehicle according to claim 5 is characterized in that: It also includes bidirectional inverters and inverters; The input end of the bidirectional inverter is connected to the battery, and the output end of the bidirectional inverter is connected to the third contactor and the inverter respectively; the output end of the inverter is also connected to the third contactor; The inverter is used to invert the DC voltage of the power battery pack into the AC voltage required by the load device; The bidirectional inverter is used to detect whether the load device is connected to a power source, and is also used to invert the DC voltage of the battery into the AC voltage required by the load device.

7. The multi-source power supply system for the new vaccination vehicle according to claim 1 is characterized in that: It also includes an intelligent monitoring and communication circuit; the control module is connected to the computer through the intelligent monitoring and communication circuit; The monitoring software in the computer monitors the operation of the multi-source power supply system and power supply lines of the new vaccination vehicle through communication lines, and records and prompts power outages.

8. A new multi-source power supply method for a vaccination vehicle, characterized in that: The multi-source power supply method for the new vaccination vehicle is applied to the multi-source power supply system for the new vaccination vehicle according to any one of claims 1 to 7, and the multi-source power supply method for the new vaccination vehicle includes: When the load equipment needs to work, it is connected to the mains to supply power to the load equipment; Determine whether the load device starts working. If the load device does not start working, determine whether the mains power is connected or suddenly cut off or the circuit fails, and obtain a first determination result; if the load device starts working, obtain a first current value flowing into the load device; If the first judgment result is that the mains power is not connected or suddenly cut off or the circuit is faulty, close the second contactor to determine whether the bidirectional inverter detects power input, and obtain the second judgment result; if the first judgment result is that the mains power is connected or not cut off or the circuit is not faulty, do nothing; If the second judgment result is that the bidirectional inverter detects power input, a second current value flowing into the load device is obtained; if the second judgment result is that the bidirectional inverter does not detect power input, the bidirectional inverter enters an inverter mode, and the battery supplies power to the load device; Determine whether the first current value or the second current value is greater than a minimum set value, and obtain a third determination result; When the third judgment result is that the first current value or the second current value is greater than the minimum setting value, it is determined that the load device is working; when the third judgment result is that the first current value or the second current value is less than or equal to the minimum setting value, it is determined that no load device is working, the first contactor or the second contactor is disconnected, and the bidirectional inverter is in standby mode; Sending a wake-up signal to the bidirectional inverter at a set time interval, so that the bidirectional inverter is in an inverter state, and supplying power to the load device through the battery; Obtaining a third current value flowing into the load device, determining whether the third current value is greater than a minimum current setting value, and obtaining a fourth determination result; If the fourth judgment result is that the third current value is greater than the minimum current setting value, it is determined that the load device needs to work, the first contactor is closed, and the load device is powered by the battery and switched to the AC power supply, or the second contactor is closed, and the load device is powered by the battery and switched to the power battery pack; if the fourth judgment result is that the third current value is less than or equal to the minimum current setting value, it is determined that the load device does not need to work.

9. The multi-source power supply method for the new vaccination vehicle according to claim 8 is characterized in that: When the load device needs to work, connecting to the mains to supply power to the load device specifically includes: Determine whether the voltage at the mains input terminal is greater than a set voltage value, and obtain a fifth determination result; If the fifth judgment result is that the first voltage signal is greater than the first set voltage value, close the first contactor; if the fifth judgment result is that the first voltage signal is less than or equal to the first set voltage value, return to the step of "determining whether the voltage at the mains input terminal is greater than the set voltage value to obtain the fifth judgment result"; Determine whether the third voltage signal at the output end of the voltage stabilizing filter circuit is equal to the second set voltage value to obtain a sixth determination result; If the sixth judgment result is that the third voltage signal is equal to the second set voltage value, the third contactor is closed; if the sixth judgment result is that the third voltage signal is greater than or less than the second set voltage value, it is determined that the voltage regulation fails or the circuit fails.

10. The multi-source power supply method for the new vaccination vehicle according to claim 9 is characterized in that: When the bidirectional inverter detects the power input of the mains or the power battery pack, it is determined whether the third current value flowing into the load device is greater than the maximum current setting value; If the third current value is greater than the maximum current setting value, the AC power or the power battery pack's power supply does not charge the battery; if the third current value is less than or equal to the maximum current setting value, the AC power or the power battery pack's power supply charges the battery while supplying power to the load device.

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