New energy vehicle power supply switching system

Abstract

The invention discloses a new energy vehicle power supply switching system which comprises a mains supply module, a power battery pack power supply module and a UPS module, the mains supply module and the power battery pack power supply module are connected to the input end of the UPS module in parallel, and the output end of the UPS module is connected with a new energy vehicle passenger area power utilization end; the UPS module includes a charger and an inverter, or includes a rectifier and an inverter. Electric power provided by the commercial power supply module or the power battery pack power supply module passes through the UPS module and then is output to the 220v power utilization end of the passenger area for power supply, in the power supply switching process of the commercial power supply module and the power battery pack power supply module, the UPS module continuously supplies power to power utilization equipment in a vehicle while stabilizing current, sudden power failure of the equipment is prevented, and the service life of the vehicle is prolonged. And meanwhile, electric appliance elements such as a capacitor in the electric equipment in the vehicle are prevented from being broken down due to the current open circuit condition in the power supply switching process.

Description

Technical Field

[0001] The present invention relates to the field of automotive electrical technology, and in particular to a power supply switching system for a new energy vehicle. Background Art

[0002] There are two conventional power supply methods for 220V AC devices on new energy vehicles. The first is to use the large-capacity power battery pack on new energy vehicles to power the on-board devices during driving. The second is to find a municipal power interface for power supply when parking. Since the power battery pack may be exhausted, an automatic power supply switching circuit is required to realize the function of the switching switch. When there is no mains power input, the power supply circuit of the on-board equipment switches to the power battery pack. When there is mains power input, the power supply circuit of the on-board equipment switches to the mains.

[0003] Referring to a power supply automatic switching circuit disclosed in Chinese invention patent CN205846855U, it includes an AC contactor KM, an over-under voltage relay K, and an indicator light HL. One end of a pair of normally open contacts of the AC contactor KM is connected to the live wire L of the mains power supply, and the other end is connected to the end of the power equipment. One end of another pair of normally open contacts of the AC contactor KM is connected to the neutral wire N of the mains power supply, and the other end is connected to the end of the power equipment. One end of a pair of normally closed contacts of the AC contactor KM is connected to the live wire L of the oil generator input, and the other end is connected to the end of the power equipment. One end of another pair of normally closed contacts of the AC contactor KM is connected to the neutral wire N of the oil generator input, and the other end is connected to the end of the power equipment. When there is mains power and the rated value of the mains voltage is normal, the equipment is powered by the mains power. When there is no mains power or the rated value of the mains voltage is abnormal, the circuit automatically switches to power supply by the oil generator.

[0004] Because the voltage of the diesel engine may be lower than the standard voltage of the AC power supply, there may be an extremely short current circuit when the circuit between the AC power supply end and the diesel engine power supply end is switched. The current generated during the switching process is very likely to break down the capacitors and other electrical components in the electrical equipment in the vehicle, causing damage to the equipment. Summary of the invention

[0005] The present invention provides a power supply switching system for new energy vehicles, aiming to solve the problem that the current generated by the existing automatic power supply switching circuit during the switching process is very likely to break down electrical components such as capacitors in electrical equipment in the vehicle.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A power supply switching system for a new energy vehicle comprises a mains power supply module, a power supply module for a power battery pack and a UPS module, wherein the mains power supply module and the power supply module for the power battery pack are connected in parallel to the input end of the UPS module, and the output end of the UPS module is connected to the power consumption end of the passenger area of ​​the new energy vehicle; the UPS module comprises a first branch, a second branch and a third branch arranged in parallel, wherein the first branch is provided with a maintenance mode switch, the second branch comprises an input detection switch and a static switch arranged in series in sequence, the third branch comprises a charger, an inverter and a static switch arranged in series in sequence, or comprises a rectifier, an inverter and a static switch, and a battery is further connected between the charger or the rectifier and the static switch; when the mains power supply module or the power supply module for the power battery pack works normally, current is input into the UPS module and then output via the third branch; when a fault occurs at the input end of the third branch, current is output to the output end of the UPS module via the second branch.

[0007] Furthermore, part of the current in the third branch is used to charge the battery, and the other part is output to the output end of the UPS module after passing through the inverter and the static switch. The battery serves as a reserve power source. When the input of the third branch is disconnected, the battery outputs current to the inverter and then outputs it to the output end of the UPS module through the static switch.

[0008] Furthermore, the above-mentioned AC power supply module includes a circuit breaker 1, a protector, a switching switch 1 and a first switching module which are arranged in series in sequence.

[0009] Furthermore, the first switching module includes a fuse 1, an S1 switch and a first AC contactor. The first AC contactor is provided with a plurality of pairs of contacts, including a first normally open contact and a first normally closed contact.

[0010] Furthermore, the power battery pack power supply module comprises a second circuit breaker, a second switching switch and a second switching module which are sequentially connected in series.

[0011] Furthermore, the second switching module includes a second fuse, an S2 switch and a second AC contactor. The second AC contactor is provided with a plurality of pairs of contacts, including a second normally open contact and a second normally closed contact.

[0012] Furthermore, the L corresponding to the above-mentioned fuse 1 is connected in series with the power supply end L of the first AC contactor; the N corresponding to the fuse 1 is connected in series with the second normally closed contact of the second AC contactor and the power supply end N of the first AC contactor through the S1 switch, and the first normally open contact of the first AC contactor is connected in series with the input end of the UPS module.

[0013] Furthermore, the L corresponding to the above-mentioned fuse 2 is connected in series with the power supply end L of the second AC contactor; the N corresponding to the fuse 2 is connected in series with the first normally closed contact of the first AC contactor and the power supply end N of the second AC contactor through the S2 switch, and the second normally open contact of the second AC contactor is connected in series with the input end of the UPS module.

[0014] Furthermore, a circuit breaker three is connected between the output end of the UPS module and the power consumption end of the passenger area of ​​the new energy vehicle.

[0015] From the above description of the structure of the present invention, it can be seen that the present invention has the following advantages: In the present invention, the power provided by the AC power supply module or the power battery pack power supply module is output to the 220V power supply end in the passenger area after passing through the UPS module. During the power supply switching process between the AC power supply module and the power battery pack power supply module, the UPS module continuously supplies power to the electrical equipment in the vehicle while stabilizing the current to prevent sudden power outages of the equipment, and at the same time avoid the current circuit caused by the power supply switching process to break down electrical components such as capacitors in the electrical equipment in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a circuit schematic diagram of the present invention.

[0017] Figure 2 It is a circuit schematic diagram of the first switching module in the present invention.

[0018] Figure 3 It is a circuit schematic diagram of the second switching module in the present invention.

[0019] In the figure: 10-mains power supply module; 11-circuit breaker 1; 12-protector; 13-switching switch 1; 14-first switching module; 141-fuse 1; 142-S1 switch; 15-first AC contactor; 151-first normally open contact; 152-first normally closed contact; 20-power battery pack power supply module; 21-circuit breaker 2; 22-switching switch 2; 23-second switching module; 231-fuse 2; 232-S2 switch; 24-second AC contactor; 241-second normally open contact; 242-second normally closed contact; 30-UPS module; 31-first branch; 311-maintenance mode switch; 32-second branch; 321-input detection switch; 322-static switch; 33-third branch; 331-rectifier / charger; 332-inverter; 333-battery; 40-circuit breaker 3. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is described below with reference to the accompanying drawings. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details. For well-known components, methods and processes, they are not described in detail below.

[0021] A new energy vehicle power supply switching system, referring to Figure 1 , including a mains power supply module 10, a power battery pack power supply module 20 and a UPS module 30. The mains power supply module 10 and the power battery pack power supply module 20 are connected in parallel to the input end of the UPS module 30, and the output end of the UPS module 30 is connected to the power end of the passenger area of ​​the new energy vehicle.

[0022] Reference Figure 1 The AC power supply module 10 includes a circuit breaker 11, a protector 12, a switch 13 and a first switching module 14 which are sequentially connected in series; the first switching module 14 includes a fuse 141, an S1 switch 142 and a first AC contactor 15, and the first AC contactor 15 is provided with multiple pairs of contacts, including a first normally open contact 151 and a first normally closed contact 152.

[0023] Reference Figure 2 , the L corresponding to the fuse 141 is connected in series with the power supply end L of the first AC contactor 15; the N corresponding to the fuse 141 is connected in series with the second normally closed contact 242 of the second AC contactor 24 and the power supply end N of the first AC contactor 15 through the S1 switch 142, and the first normally open contact 151 of the first AC contactor 15 is connected in series with the input end of the UPS module 30.

[0024] Reference Figure 1 The power battery pack power supply module 20 includes a circuit breaker 21, a switching switch 22 and a second switching module 23 which are arranged in series in sequence; the second switching module 23 includes a fuse 231, an S2 switch 232 and a second AC contactor 24, and the second AC contactor 24 is provided with multiple pairs of contacts, including a second normally open contact 241 and a second normally closed contact 242.

[0025] Reference Figure 3 , the L corresponding to the second fuse 231 is connected in series with the power supply end L of the second AC contactor 24; the N corresponding to the second fuse 231 is connected in series with the first normally closed contact 152 of the first AC contactor 15 and the power supply end N of the second AC contactor 24 through the S2 switch 232, and the second normally open contact 241 of the second AC contactor 24 is connected in series with the input end of the UPS module 30.

[0026] Reference Figures 1 to 3The protector 12 provided between the input end of the mains power supply module 10 and the switch 1 13 plays the role of over-undervoltage over-current automatic reclosing and real-time display of voltage and current in the circuit. The circuit breaker 1 11 and the circuit breaker 2 21 play the role of voltage stabilization protection and mains power on-off in the circuit, and the fuse 1 141 and the fuse 2 231 play the role of current protection in the circuit. The S1 switch 142 and the S2 switch 232 use a single-pole self-locking power switch with a contact current capacity of 5A and a 220V. The first AC contactor 15 and the second AC contactor 24 use AC contactors with a coil voltage of 220V.

[0027] When the power battery pack power supply module 20 supplies power to the circuit, the second AC contactor 24 is energized and closed, the second normally open contact 241 is connected, the second normally closed contact 242 is disconnected, and the first AC contactor 15 is disconnected; when the power battery pack power supply module 20 fails, the second AC contactor 24 is disconnected, the second normally open contact 241 is disconnected, and the second normally closed contact 242 is connected, so that the first AC contactor 15 is energized and closed, the first normally open contact 151 is connected, and the first normally closed contact 152 is disconnected, and the AC power supply module 10 is switched to power the circuit.

[0028] When the AC power supply module 10 supplies power to the circuit, the first AC contactor 15 is energized and attracted, the first normally open contact 151 is connected, the first normally closed contact 152 is disconnected, and the second AC contactor 24 is disconnected; when the AC power supply module 10 fails, the first AC contactor 15 is disconnected, the first normally open contact 151 is disconnected, the first normally closed contact 152 is connected, the second AC contactor 24 is energized and attracted, the second normally open contact 241 is connected, and the second normally closed contact 242 is disconnected, and the power battery pack power supply module 20 is switched to power the circuit.

[0029] The UPS module 30 includes a first branch 31, a second branch 32 and a third branch 33 which are connected in parallel, and the output ends of the first branch 31, the second branch 32 and the third branch 33 are connected to the output end of the UPS module 30. A maintenance mode switch 311 is provided in the first branch 31, the second branch 32 includes an input detection switch 321 and a static switch 322 which are connected in series in sequence, and the third branch 33 includes a rectifier / charger 331, an inverter 332 and a static switch 322 which are connected in series in sequence, and a battery 333 is also connected between the rectifier / charger 331 and the static switch 322.

[0030] When the mains power supply module 10 or the power battery pack power supply module 20 is working normally, the current is input to the UPS module 30 and then output through the third branch 33. A part of the current in the third branch 33 is used to charge the battery 333, and the other part is converted from direct current to alternating current through the inverter 332, and then output to the output end of the UPS module 30 after passing through the static switch 322, and used by the power end of the passenger area of ​​the new energy vehicle. The battery 333 is used as a reserve power source. When the input of the third branch 33 is disconnected, the battery 333 outputs current to the inverter 332 and then becomes alternating current, and then outputs it through the static switch 322. When a fault occurs at the input end of the third branch 33, the current is selected by the static switch 322 and output through the second branch 32 to the power end of the passenger area of ​​the new energy vehicle for use.

[0031] The power provided by the AC power supply module 10 or the power battery pack power supply module 20 is output to the circuit breaker three 40 after double conversion (AC-DC-AC) by the rectifier / charger 331 and the inverter 332, and the 220V power supply end of the passenger area of ​​the new energy vehicle is supplied with power through the circuit breaker three 40. At the same time, the rectifier / charger 331 performs float charging on the batteries in the power battery pack power supply module 20 to keep the batteries in a fully charged state.

[0032] When the UPS module 30 needs to be maintained, all switches need to be disconnected, and the maintenance mode switch 311 needs to be manually enabled before the UPS module 30 can be maintained.

[0033] The selection of UPS module 30 is determined according to the total power of the electrical equipment in the new energy vehicle. The total power of UPS module 30 is greater than the total power of the electrical equipment in the vehicle. When the 220V circuit at the AC power supply module 10 and the 220V circuit at the power battery pack power supply module 20 are switched, UPS module 30 continues to supply power to the electrical equipment in the vehicle to avoid sudden power failure of the equipment.

[0034] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A power supply switching system for new energy vehicles, characterized in that: It includes a mains power supply module, a power battery pack power supply module and a UPS module, wherein the mains power supply module and the power battery pack power supply module are connected in parallel to the input end of the UPS module, and the output end of the UPS module is connected to the power consumption end of the passenger area of ​​the new energy vehicle; the UPS module includes a first branch, a second branch and a third branch arranged in parallel, the first branch is provided with a maintenance mode switch, the second branch includes an input detection switch and a static switch arranged in series in sequence, the third branch includes a charger, an inverter and a static switch arranged in series in sequence, or includes a rectifier, an inverter and a static switch, and a battery is also connected between the charger or the rectifier and the static switch; when the mains power supply module or the power battery pack power supply module works normally, the current is input into the UPS module and then output via the third branch; when a fault occurs at the input end of the third branch, the current is output to the output end of the UPS module through the second branch.

2. The new energy vehicle power supply switching system according to claim 1 is characterized in that: Part of the current in the third branch is used to charge the battery, and the other part is output to the output end of the UPS module after passing through the inverter and the static switch. The battery serves as a reserve power source. When the input of the third branch is disconnected, the battery outputs current to the inverter and then outputs it to the output end of the UPS module through the static switch.

3. The new energy vehicle power supply switching system according to claim 1, characterized in that: The mains power supply module comprises a circuit breaker 1, a protector, a switching switch 1 and a first switching module which are sequentially arranged in series.

4. The new energy vehicle power supply switching system according to claim 3 is characterized in that: The first switching module includes a fuse 1, an S1 switch and a first AC contactor. The first AC contactor is provided with a plurality of pairs of contacts, including a first normally open contact and a first normally closed contact.

5. The new energy vehicle power supply switching system according to claim 4 is characterized in that: The power battery pack power supply module includes a second circuit breaker, a second switching switch and a second switching module which are sequentially connected in series.

6. The new energy vehicle power supply switching system according to claim 5, characterized in that: The second switching module includes a second fuse, an S2 switch and a second AC contactor. The second AC contactor is provided with a plurality of pairs of contacts, including a second normally open contact and a second normally closed contact.

7. The new energy vehicle power supply switching system according to claim 6, characterized in that: The L corresponding to the fuse is connected in series with the power supply end L of the first AC contactor; the N corresponding to the fuse is connected in series with the second normally closed contact of the second AC contactor and the power supply end N of the first AC contactor through the S1 switch, and the first normally open contact of the first AC contactor is connected in series with the input end of the UPS module.

8. The new energy vehicle power supply switching system according to claim 6, characterized in that: The L corresponding to the second fuse is connected in series with the power supply end L of the second AC contactor; the N corresponding to the second fuse is connected in series with the first normally closed contact of the first AC contactor and the power supply end N of the second AC contactor through the S2 switch, and the second normally open contact of the second AC contactor is connected in series with the input end of the UPS module.

9. The new energy vehicle power supply switching system according to claim 1, characterized in that: A circuit breaker three is also connected between the output end of the UPS module and the power consumption end of the passenger area of ​​the new energy vehicle.

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