Redundant power supply system and control method thereof

Abstract

The invention discloses a redundant power supply system and a control method thereof, and relates to the technical field of power supply and distribution. The monitoring module is used for continuously collecting the temperature of the storage battery pack to obtain the corresponding floating charge voltage when any power supply module supplies power to the load, and judging whether the voltage of the storage battery pack is smaller than the floating charge voltage or not; and sending a preset charging current to the power supply module if the judgment is carried out every time, otherwise, sending the floating charging voltage to the power supply module; any power supply module is used for performing constant-current charging on the storage battery pack by using the charging current when the charging current is received; and when the floating charge voltage is received, carrying out floating charge on the storage battery pack by using the floating charge voltage. According to the redundant power supply system and the control method thereof, the floating charge voltage adjustment of the storage battery pack through the monitoring module is realized, the current overshoot at the power-on moment of the low-capacity battery and the virtual charge degree in the high and low temperature environment are reduced, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of power supply and distribution, and particularly relates to a redundant power supply system and a control method thereof. Background Art

[0002] At present, in the operating conditions of special vehicles, different power supply modes are usually applied in different mission profiles, namely: ① When testing in a factory building, mains power supply is adopted, which can ensure a quiet, clean and safe test environment, and at the same time reduce the fuel consumption of the chassis; ② When there is no mains power during driving, a chassis power take-off generator is used to supply power to meet the heavy load power consumption requirements of the upper equipment such as air conditioners; ③ When performing tasks, a separate battery is used for standby to maintain silence and reduce heat characteristics.

[0003] In the related art, the battery pack generally directly goes to the generator output terminal and is charged using the generator output. This charging method has a large initial charging current, and the battery voltage rises rapidly, which is likely to cause false charging, insufficient actual usable capacity, and shortened battery life, seriously affecting the vehicle standby working time index and reducing the equipment performance. Especially in low-temperature conditions, the degree of false charging is even more serious. Summary of the Invention

[0004] The present application provides a redundant power supply system and a control method thereof, which can solve the technical problems of false charging of the battery pack and shortened battery life existing in the prior art.

[0005] In a first aspect, the present application provides a redundant power supply system, which includes:

[0006] A battery pack;

[0007] Two power supply modules, including a power take-off generator set and an AC / DC conversion module;

[0008] A monitoring module, which is used for continuously collecting the temperature of the battery pack to obtain the corresponding floating charge voltage when any one of the power supply modules supplies power to the load, and judging whether the voltage of the battery pack is less than the floating charge voltage; and each time a judgment is made, if so, a preset charging current is sent to the power supply module, otherwise, the floating charge voltage is sent to the power supply module;

[0009] Any one of the power supply modules is used for performing constant current charging on the battery pack with the above-mentioned charging current when receiving the above-mentioned charging current; and performing floating charge charging on the battery pack with the floating charge voltage when receiving the floating charge voltage.

[0010] In combination with the first aspect, in an implementation manner, the above-mentioned monitoring module is further used for obtaining a floating charge voltage difference according to the collected temperature, and using the sum of the floating charge voltage difference and the initial floating charge voltage value as the floating charge voltage corresponding to the temperature.

[0011] In combination with the first aspect, in one embodiment, a diode is connected in series to the output ends of the power take-off generator set and the AC / DC conversion module respectively, and then they are connected in parallel to the DC bus.

[0012] In combination with the first aspect, in one embodiment, the system further includes a charge and discharge circuit connected to the battery pack for realizing the charging and discharging of the battery pack.

[0013] When in the mains power output mode, the AC / DC conversion module is used to receive the signal from the monitoring module, convert the mains power into direct current and output it to the load and the battery pack, and the monitoring module is used to drive the charge and discharge circuit to control the charging of the battery pack.

[0014] When in the generator output mode, the power take-off generator set is used to receive the signal from the monitoring module to generate electricity, and output the generated electric energy to the load and the battery; the monitoring module is used to drive the charge and discharge circuit to control the charging of the battery pack.

[0015] When in the battery pack output mode, the monitoring module is used to drive the charge and discharge circuit to control the discharge of the battery pack and output it to the load.

[0016] In combination with the first aspect, in one embodiment, when in the mains power output mode and the mains power is lost, or when in the generator output mode and the power take-off generator set loses power, the monitoring module is used to drive the charge and discharge circuit to control the discharge of the battery pack and output it to the load.

[0017] In combination with the first aspect, in one embodiment, the power take-off generator set includes a generator controller and a generator. The generator controller is communicatively connected to the monitoring module. The generator controller is connected to the generator to control the operation of the generator, and the generator is connected to the DC bus.

[0018] In a second aspect, the present application provides a control method for the redundant power supply system, and the method includes:

[0019] When any power supply module supplies power to the load, the monitoring module continuously collects the temperature of the battery pack to obtain the corresponding floating charge voltage, and judges whether the voltage of the battery pack is less than the floating charge voltage; each time a judgment is made, if so, a preset charging current is sent to the power supply module, otherwise, the floating charge voltage is sent to the power supply module.

[0020] When any power supply module receives the above charging current, it performs constant current charging on the battery pack with the above charging current; and when it receives the floating charge voltage, it performs floating charge charging on the battery pack with the floating charge voltage.

[0021] In combination with the second aspect, in one embodiment, obtaining the corresponding floating charge voltage specifically includes:

[0022] Obtaining the floating charge voltage difference according to the collected temperature;

[0023] Obtaining the initial floating charge voltage value, and using the sum of the above floating charge voltage difference and the initial floating charge voltage value as the floating charge voltage corresponding to this temperature.

[0024] In combination with the second aspect, in one embodiment, the above floating charge voltage V2 is:

[0025] V2 = V1 + (T - 25) * k t

[0026] Wherein, V1 is the initial floating charge voltage value, T is the temperature, and k t Is the temperature coefficient.

[0027] In combination with the second aspect, in one embodiment, the above method further includes:

[0028] When in the generator output mode, the power take-off generating set receives the signal of the above monitoring module to generate electricity, and outputs the generated electric energy to the load and the above storage battery. At the same time, the monitoring module controls the AC / DC conversion module to disconnect the output, and the storage battery maintains the generator charging state without disconnecting;

[0029] If the generator shuts down normally, the battery pack returns to the charging state of the AC / DC conversion module or is in the power supply state.

[0030] The beneficial effects brought by the technical solution provided by this application include:

[0031] For the redundant power supply system and its control method of this application, when any power supply module supplies power to the load, the monitoring module continuously collects the temperature of the battery pack to obtain the corresponding floating charge voltage, and judges whether the voltage of the battery pack is less than the floating charge voltage. And every time it is judged, if the voltage of the above battery pack is less than the floating charge voltage, the preset charging current is sent to the power supply module, otherwise, the floating charge voltage is sent to the power supply module, so that the power supply module charges the battery pack according to the received charging current or floating charge voltage, realizing the floating charge voltage adjustment of the battery pack through the monitoring module, reducing the current overshoot at the time of power-on of low-capacity batteries and the degree of false charging in high and low temperature environments, extending the battery life, and solving the technical problems of false charging of the battery pack and shortening of battery life in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a block diagram of the composition of an embodiment of the redundant power supply system of this application;

[0033] Figure 2Schematic flowchart of an embodiment of the control method of the present application;

[0034] Figure 3 System startup and operation process in the control method of the present application Figure 1 ;

[0035] Figure 4 System startup and operation process in the control method of the present application Figure 2 ;

[0036] Figure 5 Interlock control flowchart in the control method of the present application;

[0037] Figure 6 Schematic flowchart of the charge and discharge control of the battery pack in the control method of the present application. Detailed implementation manners

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0039] In a first aspect, an embodiment of the present application provides a redundant power supply system.

[0040] In one embodiment, referring to Figure 1 , Figure 1 is a block diagram of the first embodiment of the redundant power supply system of the present application. The redundant power supply system includes a battery pack, a power supply module, and a monitoring module.

[0041] There are two power supply modules mentioned above, namely a power take-off generator set and an AC / DC conversion module respectively.

[0042] The monitoring module is used to continuously collect the temperature of the battery pack to obtain the corresponding floating charge voltage and determine whether the voltage of the battery pack is less than the floating charge voltage when any one of the power supply modules supplies power to the load; and each time a judgment is made, if so, a preset charging current is sent to the power supply module, otherwise, the floating charge voltage is sent to the power supply module.

[0043] Any one of the power supply modules mentioned above is used to perform constant current charging on the battery pack with the charging current when receiving the charging current sent by the monitoring module; and perform floating charge charging on the battery pack with the floating charge voltage when receiving the floating charge voltage sent by the monitoring module.

[0044] Specifically, when the power take-off generator set supplies power to the load, the above monitoring module is used to continuously collect the temperature of the battery pack to obtain the corresponding floating charge voltage, and determine whether the voltage of the battery pack is less than the floating charge voltage. Each time a judgment is made, if the voltage of the battery pack is less than the floating charge voltage, a preset charging current is sent to the power take-off generator set; otherwise, the floating charge voltage is sent to the power take-off generator set. The above power take-off generator set is also used to perform constant current charging on the battery pack with the above charging current when receiving the charging current sent by the monitoring module; and perform floating charge charging on the battery pack with the floating charge voltage when receiving the floating charge voltage sent by the monitoring module.

[0045] When the AC / DC conversion module supplies power to the load, the above monitoring module is used to continuously collect the temperature of the battery pack to obtain the corresponding floating charge voltage, and determine whether the voltage of the battery pack is less than the floating charge voltage. Each time a judgment is made, and if the voltage of the battery pack is less than the floating charge voltage, a preset charging current is sent to the AC / DC conversion module; otherwise, the floating charge voltage is sent to the AC / DC conversion module. The above AC / DC conversion module is also used to perform constant current charging on the battery pack with the above charging current when receiving the charging current sent by the monitoring module; and perform floating charge charging on the battery pack with the floating charge voltage when receiving the floating charge voltage sent by the monitoring module.

[0046] In this embodiment, when any power supply module supplies power to the load, the monitoring module continuously collects the temperature of the battery pack to obtain the corresponding floating charge voltage, and determines whether the voltage of the battery pack is less than the floating charge voltage. And each time a judgment is made, if the voltage of the battery pack is less than the floating charge voltage, a preset charging current is sent to the power supply module; otherwise, the floating charge voltage is sent to the power supply module, so that the power supply module charges the battery pack according to the received charging current or floating charge voltage, realizing the adjustment of the floating charge voltage of the battery pack through the monitoring module, reducing the current overshoot at the moment of power-on of low-capacity batteries and the degree of false charging in high and low temperature environments, prolonging the battery life, and solving the technical problems of false charging of the battery pack and shortening of the battery life in the related art.

[0047] Further, in one embodiment, the above monitoring module is also used to obtain the floating charge voltage difference according to the collected temperature, and use the sum of the floating charge voltage difference and the initial floating charge voltage value as the floating charge voltage corresponding to the temperature.

[0048] Optionally, the initial floating charge voltage value is used as the floating charge voltage initially stored in the monitoring module.

[0049] Optionally, the above monitoring module is further configured to compare the temperature of the battery pack collected for the first time with the room temperature of 25°C. If the collected temperature is 25°C, the initial floating charge voltage value is directly obtained as the current floating charge voltage; if the collected temperature is not 25°C, the floating charge voltage at the current temperature is updated and calculated based on the initial floating charge voltage value.

[0050] When the monitoring module collects the temperature of the battery pack again, it is also configured to compare it with the temperature collected last time. If the temperature changes, the floating charge voltage is updated and calculated; if the temperature does not change, the floating charge voltage calculated last time is directly obtained, that is, the floating charge voltage remains unchanged.

[0051] Optionally, the above preset charging current and initial floating charge voltage value can both be set according to the actual situation.

[0052] Further, in one embodiment, a diode is connected in series at the output ends of the above power take-off generator set and the AC / DC conversion module and then connected in parallel to the DC bus.

[0053] In this embodiment, the above two diodes are used to achieve parallel isolation of the outputs of the AC / DC conversion module and the power take-off generator set.

[0054] Further, in one embodiment, the above system further includes a charge and discharge circuit connected to the battery pack, and the charge and discharge circuit is used to implement the charging and discharging of the battery pack.

[0055] When in the mains output mode, the above AC / DC conversion module is configured to receive the signal of the above monitoring module, convert the mains power into direct current and output it to the load and the above battery pack, and the above monitoring module is configured to drive the above charge and discharge circuit to control the charging of the above battery pack;

[0056] When in the generator output mode, the above power take-off generator set is configured to receive the signal of the above monitoring module to generate electricity and output the generated electric energy to the load and the above battery; the above monitoring module is configured to drive the above charge and discharge circuit to control the charging of the above battery pack;

[0057] When in the battery pack output mode, the above monitoring module is configured to drive the above charge and discharge circuit to control the discharging of the above battery pack and output it to the load.

[0058] Further, in this embodiment, when in the mains output mode and the mains power is lost, or when in the generator output mode and the power take-off generator set loses power, the above monitoring module is configured to drive the above charge and discharge circuit to control the discharging of the above battery pack and output it to the load.

[0059] In this embodiment, in the battery pack output mode, the battery pack is discharged under the drive of the monitoring module through the charge and discharge circuit control; in the generator output mode, the generator of the power take-off generator set supplies the bus load on the one hand and charges the battery pack on the other hand; in the mains output mode, the AC / DC conversion module supplies the bus load on the one hand and charges the battery pack on the other hand; if the generator output or the mains power suddenly fails, it seamlessly switches to the battery pack for power supply.

[0060] Further, in this embodiment, the above-mentioned power take-off generator set includes a generator controller and a generator. The generator controller is communicatively connected to the monitoring module. The generator controller is connected to the generator to control the operation of the generator and perform power generation sampling on the generator output. The generator is connected to the DC bus to supply power to the load.

[0061] In this embodiment, in the generator output mode, if the generator output is successful, the battery pack is charged, and the monitoring module outputs a control signal to ensure that the battery pack cannot be cut off, preventing excessive generator output surges during the switching instant and damaging the low-voltage load; the battery pack must be normally disconnected after the generator shuts down normally to implement the battery pack output control function.

[0062] Preferably, the redundant power supply system in this embodiment is a DC power supply and generator redundant power supply system, which is applicable to low-voltage DC power supplies, low-voltage DC generators, and lead-acid battery packs.

[0063] In this embodiment, the DC power supply is a UPS power supply, i.e., an uninterruptible power supply. The UPS power supply includes a monitoring module, a charge and discharge circuit, an AC / DC conversion module, and a battery pack; the above-mentioned power take-off generator set includes a generator and a generator controller, and the generator is a power take-off generator. The redundant power supply system has three power supply modes: battery pack power supply, mains power supply after AC / DC conversion by the UPS power supply, and generator power supply. The battery pack can be charged through the generator or the AC / DC conversion module. In addition, when the mains power or the power take-off suddenly fails, the battery pack seamlessly switches to supply power, providing an uninterruptible power supply with no power-off time, ensuring that the upper-mounted equipment does not stop working and ensuring reliable system power supply. Among them, the UPS power supply and the generator controller perform information interaction to achieve power supply interlock and battery pack charge and discharge management.

[0064] In this embodiment, the power take-off generator and the generator controller obtain power through mechanical power take-off. The exciting current acts on the rotor winding, and the stator winding induces an alternating electromotive force, which is rectified and then outputs direct current.

[0065] In this embodiment, the monitoring module serves as the center of the battery pack status management, and controls the charging and discharging of the battery through driving the charging and discharging circuit; the monitoring module is also used to collect the battery voltage and the battery charging and discharging current in real time, calculate the integral of the battery pack capacity and display it; the monitoring module is also used to collect the battery voltage in real time and manage the over-discharge of the battery pack.

[0066] In the constant current charging stage, the monitoring module issues the constant current charging current value, that is, the preset charging current as the current limiting point, to the AC / DC conversion module or the generator controller, so as to realize the constant current output of the AC / DC conversion module or the generator controller, and reduce the current overshoot at the power-on moment of the low-capacity battery; the monitoring module also monitors the ambient temperature of the battery pack in real time, adjusts the floating charge voltage online according to the battery temperature in real time, and issues it to the AC / DC conversion module or the generator controller for output voltage control.

[0067] Therefore, the redundant power supply system of this embodiment meets the following requirements: 1. The power supply requirements and power supply reliability under different mission profiles of special vehicles, that is, it has three redundant power supply methods of "generator, commercial power, and battery pack"; 2. When the commercial power is suddenly lost, the battery pack switches seamlessly to avoid output power failure; 3. When the generator fails and suddenly loses power, the battery pack switches seamlessly to avoid output power failure; 4. It can avoid the current overshoot caused by the direct connection of the generator output to the battery pack and the overcharge of the generator output voltage after the battery pack is suddenly disconnected; 5. It has the function of battery charging and discharging management, can control the output of the AC / DC conversion module and the generator controller, so that the battery can realize constant current-floating charge charging in both the commercial power charging and generator charging modes, and manage the SOC of the battery pack through the monitoring module to increase the SOC accuracy; 6. The battery pack adjusts the floating charge voltage through the monitoring module to ensure the normal charging of the battery in high-cold and high-heat environments, prevent the battery pack from being falsely charged, and adjust the floating charge voltage in real time by introducing a temperature correction control algorithm, that is, the output voltage of the AC / DC conversion module and the generator; it solves the problems of the stability and coordination of redundant power supply, the uncontrolled battery charging in the generator output mode, and the battery safety in the related technology.

[0068] In a second aspect, the embodiments of the present application also provide a control method for a redundant power supply system.

[0069] In one embodiment, as Figure 2 shown, the control method of the above redundant power supply system includes:

[0070] S1. When any power supply module supplies power to the load, the monitoring module continuously collects the temperature of the battery pack to obtain the corresponding floating charge voltage, and judges whether the voltage of the battery pack is less than the floating charge voltage; each time it is judged, if so, the preset charging current is sent to the power supply module, otherwise, the floating charge voltage is sent to the power supply module;

[0071] S2. When any power supply module receives the above charging current, it charges the above battery pack with a constant current at the above charging current; and when it receives the floating charge voltage, it charges the above battery pack with the floating charge voltage.

[0072] Optionally, an initial floating charge voltage value is stored in the monitoring module.

[0073] Further, in one embodiment, in the above step S1, obtaining the corresponding floating charge voltage specifically includes:

[0074] First, obtain the floating charge voltage difference according to the collected temperature;

[0075] Then, obtain the initial floating charge voltage value, and use the sum of the above floating charge voltage difference and the initial floating charge voltage value as the floating charge voltage corresponding to this temperature.

[0076] Further, in this embodiment, the above floating charge voltage V2 is:

[0077] V2 = V1 + (T - 25) * k t

[0078] wherein, V1 is the initial floating charge voltage value, T is the temperature, and k t is the temperature coefficient.

[0079] Optionally, the above initial floating charge voltage value is 28V, and the above preset charging current is 0.25C.

[0080] Further, in one embodiment, the above redundant power supply system further includes a charge and discharge circuit connected to the battery pack, and the charge and discharge circuit is used to realize the charging and discharging of the battery pack. The above control method further includes:

[0081] When in the mains output mode, the AC / DC conversion module receives the signal from the above monitoring module, converts the mains power into direct current and outputs it to the load and the battery pack, and at the same time the monitoring module drives the charge and discharge circuit to control the charging of the above battery pack;

[0082] When in the generator output mode, the power take-off generator set receives the signal from the above monitoring module to generate electricity, and outputs the generated electric energy to the load and the above battery, and at the same time the monitoring module drives the above charge and discharge circuit to control the charging of the above battery pack;

[0083] When in the battery pack output mode, the above monitoring module drives the above charge and discharge circuit to control the discharge of the above battery pack and output it to the load.

[0084] Further, in one embodiment, when in the mains power output mode and the mains power is lost, or when in the generator output mode and the power take-off generator set loses power, the above monitoring module drives the above charge and discharge circuit to control the battery pack to discharge and output to the load.

[0085] In this embodiment, the above monitoring module mainly completes the status monitoring of the battery pack, issues instructions to the charge and discharge circuit to achieve charge and discharge control, and communicates with the AC / DC conversion module and the generator controller to achieve power supply interlock and temperature compensation type voltage regulation charging.

[0086] Specifically, the monitoring module drives the charge and discharge circuit to realize the switching of the battery charging circuit and the discharge circuit.

[0087] Specifically, the monitoring module issues instructions, interacts with the AC / DC conversion module in real time through internal CAN communication, and interacts with the generator controller in real time through external CAN communication. In both charging methods, temperature compensation type voltage regulation charging of the battery pack can be realized, the battery environment can be monitored in real time to adjust the floating charge voltage, prevent undercharging and improve the charging efficiency.

[0088] When the generator is working normally, the system enters the interlock mode. The monitoring module controls the AC / DC conversion module to disconnect the output, and the battery pack maintains the charging state of the generator without disconnecting; after the generator shuts down normally, the battery pack returns to the charging state or the power supply state of the AC / DC conversion module, and can be disconnected by normal operation.

[0089] In this embodiment, the connection of the battery pack is realized by the monitoring module controlling the charge and discharge circuit, and the battery pack can be directly connected to supply power under any working condition.

[0090] As an optional implementation manner, in one embodiment, as Figure 3 shown, when the UPS power supply is turned on, if there is mains power input, the vehicle is in the mains power output mode, outputs power through the AC / DC conversion module, charges the battery, and supplies power to the load; if there is no mains power input or the mains power is lost, the battery pack is seamlessly switched to output power. When the battery pack supplies power to the load, if the generator successfully outputs, the vehicle is in the generator output mode, outputs power through the generator, charges the battery, and supplies power to the load; and when the generator shuts down, the battery pack output is re-switched to supply power to the load. If the generator does not shut down, it continues to output.

[0091] As an optional implementation manner, in one embodiment, as Figure 4 shown, when outputting power through the AC / DC conversion module to charge the battery, or when the battery pack outputs power, it is judged whether the UPS power supply has a shutdown operation. If there is no shutdown operation, the output power supply remains unchanged. If there is a shutdown operation, it shuts down normally and the battery circuit is cut off.

[0092] As an optional implementation manner, in one embodiment, as Figure 5 shown, when power is supplied through the generator output and the battery is charged, if there is an operation to shut down the generator, then switch to the battery pack output for power supply; otherwise, maintain the generator output for power supply and the battery charging. When power is supplied through the generator output and the battery is charged, the output of the power take-off generator set is interlocked with the output of the AC / DC conversion module, and regardless of whether there is an operation to shut down the UPS power supply, maintain the generator output for power supply and the battery charging.

[0093] As an optional implementation manner, in one embodiment, as Figure 6 shown, after the UPS power supply is turned on, the above control method specifically includes:

[0094] A1. Determine whether there is mains input. If so, go to A4; otherwise, go to A2.

[0095] A2. The battery pack discharges;

[0096] A3. Determine whether the generator output is successful. If so, go to A4; otherwise, go to A2.

[0097] A4. The monitoring module collects the temperature of the battery pack and determines whether the temperature changes. If so, go to A5; otherwise, go to A6.

[0098] A5. Update the floating charge voltage and go to A7.

[0099] A6. Keep the floating charge voltage unchanged;

[0100] A7. Determine whether the voltage of the battery pack is greater than or equal to the floating charge voltage. If so, go to A9; otherwise, go to A8.

[0101] A8. Send the preset charging current to the power supply module to charge the battery pack and go to A4.

[0102] A9. Send the floating charge voltage to the power supply module to charge the battery pack and go to A4.

[0103] In this embodiment, the monitoring module collects battery voltage, current, and temperature data, and calculates and issues the charging current in the constant current stage, issues the floating charge voltage according to the current battery temperature, and other values.

[0104] Optionally, determine the recommended floating charge voltage V1 and temperature coefficient k t (unit: mV / ℃) of the battery temperature of 25 °C according to the battery sample, and collect the current battery temperature T; to obtain the real-time floating charge voltage for battery charging. Eventually, the battery pack charging in actual use will reach thermal equilibrium, and V2 will eventually be the stable state value.

[0105] In this embodiment, the monitoring module monitors the operating state information of the battery pack. During the constant current stage in the early charging period, the current of 0.25C is used to adjust the output voltages of the AC / DC conversion module and the generator. When the battery voltage reaches the current V2, the AC / DC conversion module and the generator are adjusted to output at a constant voltage of V2 for floating charge. The monitoring module exchanges information with the AC / DC conversion module through internal CAN communication and exchanges information with the generator controller through external CAN communication, and accordingly outputs to achieve the output mode of constant current first and then constant voltage.

[0106] In this embodiment, the power-on and power-off of the UPS power supply involve operations in two states. State 1: When there is commercial power, power-on means starting the AC / DC conversion module and charging the battery, and power-off means turning off the AC / DC conversion module and disconnecting the battery charging circuit; State 2: When there is no commercial power, power-on means turning on the battery discharge circuit, and power-off means disconnecting the battery discharge circuit.

[0107] Among them, each step in the above embodiments of the control method corresponds to the function implementation of each module of the above redundant power supply system, and the implementation process will not be elaborated here one by one.

[0108] It should be noted that the serial numbers of the embodiments of the present application above are only for description and do not represent the advantages or disadvantages of the embodiments.

[0109] The terms "including" and "having" and any variations thereof in the specification, claims and drawings of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices. The descriptions of terms such as "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit that "first", "second" and "third" are of different types.

[0110] In the description of the embodiments of the present application, words such as "exemplary", "for example" or "for instance" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary", "for example" or "for instance" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example" or "for instance" is intended to present related concepts in a specific manner.

[0111] In some processes described in the embodiments of the present application, there are multiple operations or steps that appear in a specific order. However, it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or may be executed in parallel. The serial numbers of the operations are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in order or in parallel, and these operations or steps may be combined.

[0112] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A redundant power supply system, characterized in that: The system comprises: Battery pack; Two power supply modules, including a power take-off generator set and an AC / DC conversion module; A monitoring module, which is used to continuously collect the temperature of the battery pack to obtain the corresponding floating charge voltage when any power supply module supplies power to the load, and to determine whether the voltage of the battery pack is less than the floating charge voltage; and each time the determination is made, if so, a preset charging current is sent to the power supply module, otherwise, the floating charge voltage is sent to the power supply module; Any power supply module is used to perform constant current charging on the battery pack with the charging current when receiving the charging current; and to perform float charging on the battery pack with the floating charging voltage when receiving the floating charging voltage.

2. The redundant power supply system according to claim 1, wherein: The monitoring module is further used to obtain a floating charge voltage difference according to the collected temperature, and use the sum of the floating charge voltage difference and an initial floating charge voltage value as the floating charge voltage corresponding to the temperature.

3. The redundant power supply system according to claim 1, wherein: The output ends of the power take-off generator set and the AC / DC conversion module are each connected in series with a diode and then connected in parallel to the DC bus.

4. The redundant power supply system according to claim 1, wherein: The system also includes a charging and discharging circuit connected to the battery pack, for realizing charging and discharging of the battery pack; When in the mains power output mode, the AC / DC conversion module is used to receive the signal of the monitoring module, convert the mains power into direct current and output it to the load and the battery pack, and the monitoring module is used to drive the charging and discharging circuit to control the charging of the battery pack; When in generator output mode, the power-taking generator set is used to receive the signal from the monitoring module to generate electricity, and output the generated electric energy to the load and the battery; the monitoring module is used to drive the charging and discharging circuit to control the charging of the battery set; When in the battery pack output mode, the monitoring module is used to drive the charging and discharging circuit to control the battery pack to discharge and output to the load.

5. The redundant power supply system according to claim 4, characterized in that: When in the mains output mode and the mains is lost, or when in the generator output mode and the power generator set loses power, the monitoring module is used to drive the charging and discharging circuit to control the battery pack to discharge and output to the load.

6. The redundant power supply system according to claim 4, wherein: The power-taking generator set includes a generator controller and a generator. The generator controller is communicatively connected to a monitoring module. The generator controller is connected to the generator to control the operation of the generator. The generator is connected to a DC bus.

7. A control method for the redundant power supply system according to claim 1, characterized in that: The method comprises: When any power supply module supplies power to the load, the monitoring module continuously collects the temperature of the battery pack to obtain the corresponding floating charge voltage, and determines whether the voltage of the battery pack is less than the floating charge voltage; each time the judgment is made, if so, the preset charging current is sent to the power supply module, otherwise, the floating charge voltage is sent to the power supply module; When any power supply module receives the charging current, it performs constant current charging on the battery pack with the charging current; and when any power supply module receives the floating charging voltage, it performs floating charging on the battery pack with the floating charging voltage.

8. The control method according to claim 7, characterized in that: Get the corresponding float charge voltage, including: Obtain the floating charge voltage difference according to the collected temperature; An initial float charge voltage value is obtained, and a sum of the float charge voltage difference and the initial float charge voltage value is used as the float charge voltage corresponding to the temperature.

9. The control method according to claim 8, characterized in that: The float charge voltage V2 is: V2=V1+(T-25)*k t Where V1 is the initial float charge voltage, T is the temperature, k t is the temperature coefficient.

10. The control method according to claim 7, characterized in that: The method further comprises: When in generator output mode, the power take-off generator set receives the signal from the monitoring module to generate electricity, and outputs the generated electric energy to the load and the battery. At the same time, the monitoring module controls the AC / DC conversion module to disconnect the output and the battery to maintain the generator charging state without disconnection; If the generator is shut down normally, the battery pack returns to the charging state of the AC / DC conversion module or is in the power supply state.

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