Intelligent power supply system

Abstract

The utility model provides an intelligent power supply system, which relates to the technical field of power supply, and comprises a switching power supply, a mains supply, photovoltaic power generation equipment, a lead-acid battery pack, a lithium iron phosphate battery pack, an embedded controller, a touch screen and a mains supply detection circuit, and the lithium iron phosphate battery pack comprises a battery management system and a bidirectional DC-DC boost-buck adjustable circuit; the charging and discharging time of the lithium iron phosphate battery pack is set through the touch screen to meet peak load shifting, the charging and discharging voltage of the lithium iron phosphate battery pack is adjusted through the bidirectional DC-DC boost-buck adjustable circuit, whether the mains supply is powered off or not is detected through the mains supply detection circuit, and when the mains supply is powered off, the embedded controller controls the lithium iron phosphate battery pack to supply power. When the mains supply, the photovoltaic power generation equipment and the lithium iron phosphate battery pack cannot supply power to the load, the lead-acid battery pack supplies power, so that the intelligent degree of the power supply system is improved, the problem that the intelligent degree of the power supply system is low is solved, and the multi-power-supply intelligent power supply system is suitable for multi-power-supply intelligent power supply.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field, especially intelligent power supply system. BACKGROUND

[0002] Peak clipping refers to reducing the power consumption in the power peak of commercial power in the power supply system needing continuous power supply, increasing the power consumption in the commercial power valley, usually using energy storage battery to charge in the commercial power valley and discharge in the power peak.

[0003] The existing power supply system usually includes switching power supply, commercial power supplies power to load through switching power supply, and after the commercial power is cut off, the standby lead-acid battery group supplies power to the load, the lead-acid battery group is charged through the switching power supply, and the lead-acid battery discharges through the switching power supply output end to supply power to the load when the commercial power is cut off, and the oil engine generates power to supply power to the load through the switching power supply, therefore, the existing power supply system does not have the peak clipping function and the intelligent degree is low. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem that: provide a kind of intelligent power supply system, solve the problem of low intelligent degree of power supply system.

[0005] The utility model solves the technical problem that: provide a kind of intelligent power supply system, solve the problem of low intelligent degree of power supply system.

[0006] The lithium iron phosphate battery group includes battery management system and bidirectional DC-DC step-up and step-down adjustable circuit, the battery management system is used to monitor and manage battery state, and the bidirectional DC-DC step-up and step-down adjustable circuit is used to adjust charging voltage and discharging voltage;

[0007] The switching power supply includes input end and output end, the input end is connected with commercial power, and the output end is connected with lead-acid battery group, bidirectional DC-DC step-up and step-down adjustable circuit, photovoltaic power generation equipment and load respectively;

[0008] The commercial power detection circuit is connected with commercial power and embedded controller, and the embedded controller is connected with battery management system, bidirectional DC-DC step-up and step-down adjustable circuit and touch screen respectively;

[0009] The touch screen is used to display lithium iron phosphate battery state information, set charging time, set discharging time, set charging voltage and set discharging voltage;

[0010] The embedded controller is used for controlling the lithium iron phosphate battery group to charge at a set charging time and adjusting the bidirectional DC-DC step-up and step-down adjustable circuit so that the charging voltage is equal to the set charging voltage, and is used for controlling the lithium iron phosphate battery group to discharge at a set discharging time and adjusting the bidirectional DC-DC step-up and step-down adjustable circuit so that the discharging voltage is equal to the set discharging voltage.

[0011] The utility power detection circuit is used for detecting whether the utility power is powered off, and when the utility power is powered off, the embedded controller controls the lithium iron phosphate battery group to be in a discharging state and adjusts the bidirectional DC-DC step-up and step-down adjustable circuit so that the discharging voltage is equal to the set discharging voltage.

[0012] The discharging voltage of the lithium iron phosphate battery group is lower than the output voltage of the photovoltaic power generation device and higher than the output voltage of the switching power supply, and the discharging voltage of the lead-acid battery group is lower than the output voltage of the switching power supply.

[0013] Further, the intelligent power supply system further comprises an oil engine power generation device connected with the input end and the utility power detection circuit, and the oil engine power generation device is automatically started to generate power when the utility power is powered off.

[0014] Further, a fuse is connected between the negative electrode of the output end and the bidirectional DC-DC step-up and step-down adjustable circuit.

[0015] Further, the embedded controller is connected with the battery management system through RS485 communication.

[0016] Further, the rated voltage of the load is 54V, the output voltage of the photovoltaic power generation device is 55V, the discharging voltage of the lithium iron phosphate battery group is 54.5V, the output voltage of the switching power supply is 54V, and the output voltage of the lead-acid battery group is 53.5V.

[0017] The intelligent power supply system has the advantages that: the lithium iron phosphate battery group charging and discharging time is set through the touch screen, so that peak shaving is achieved, the voltage of the lithium iron phosphate battery group charging and discharging is adjusted through the bidirectional DC-DC step-up and step-down adjustable circuit, the utility power is detected through the utility power detection circuit, the lithium iron phosphate battery group is controlled to supply power through the embedded controller when the utility power is powered off, and the lead-acid battery group supplies power when the utility power, the photovoltaic power generation device and the lithium iron phosphate battery group cannot supply power to the load, so that the intelligent degree of the power supply system is improved, the problem of low intelligent degree of the power supply system is solved, and the consumption of the utility power is saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a kind of intelligent power supply system connection relationship schematic diagram provided by the utility model;

[0019] Figure 2 is another kind of intelligent power supply system connection relationship schematic diagram provided by the utility model. DETAILED DESCRIPTION

[0020] The utility model provides a kind of intelligent power supply system for the problem that power supply system does not have peak clipping and valley filling function, intelligent degree is low, for continuously power supply to load, such as Figure 1 As shown, including switching power supply, mains, photovoltaic power generation equipment, lead-acid battery pack, lithium iron phosphate battery pack, embedded controller, touch screen and mains detection circuit;

[0021] The lithium iron phosphate battery pack includes a battery management system and a bidirectional DC-DC step-up and step-down adjustable circuit, the battery management system is used to monitor and manage the battery state, and the bidirectional DC-DC step-up and step-down adjustable circuit is used to adjust the charging voltage and the discharging voltage.

[0022] The switching power supply includes an input end and an output end, the input end is connected with the mains, and the output end is connected with the lead-acid battery pack, the bidirectional DC-DC step-up and step-down adjustable circuit, the photovoltaic power generation equipment and the load respectively.

[0023] The mains detection circuit is connected with the mains and the embedded controller, and the embedded controller is connected with the battery management system, the bidirectional DC-DC step-up and step-down adjustable circuit and the touch screen respectively.

[0024] The touch screen is used to display the lithium iron phosphate battery state information, set the charging time, set the discharging time, set the charging voltage and set the discharging voltage.

[0025] The embedded controller is used to control the lithium iron phosphate battery pack to charge at the set charging time, and adjust the bidirectional DC-DC step-up and step-down adjustable circuit so that the charging voltage is equal to the set charging voltage, control the lithium iron phosphate battery pack to discharge at the set discharging time, and adjust the bidirectional DC-DC step-up and step-down adjustable circuit so that the discharging voltage is equal to the set discharging voltage.

[0026] The mains detection circuit is used to detect whether the mains is powered off, when the mains is powered off, the embedded controller controls the lithium iron phosphate battery pack to be in the discharging state, and adjusts the bidirectional DC-DC step-up and step-down adjustable circuit so that the discharging voltage is equal to the set discharging voltage.

[0027] The discharging voltage of the lithium iron phosphate battery pack is lower than the output voltage of the photovoltaic power generation equipment, and higher than the output voltage of the switching power supply, and the discharging voltage of the lead-acid battery pack is lower than the output voltage of the switching power supply.

[0028] Specifically, since the discharge voltage of the lithium iron phosphate battery pack is lower than the output voltage of the photovoltaic power generation device and higher than the output voltage of the switching power supply, and the discharge voltage of the lead-acid battery pack is lower than the output voltage of the switching power supply, the order of consumption of electrical energy by the load is: photovoltaic power generation device, lithium iron phosphate battery pack, switching power supply, lead-acid battery pack. The control logic in the embedded controller is common in peak clipping and valley filling, such as switching the lithium iron phosphate battery pack to discharge when the mains power is off. Specifically, when the mains power is off, the mains detection circuit outputs a detection signal, and the embedded controller receives the detection signal and switches to discharge the lithium iron phosphate battery pack. During the switching process, the mains and the lithium iron phosphate battery pack cannot supply power, and the photovoltaic power generation device supplies power. If the photovoltaic power generation device cannot supply power, the lead-acid battery pack supplies power, thereby realizing seamless power supply switching. The touch screen can also display related information of the lithium iron phosphate battery pack, such as remaining capacity, charging and discharging state, charging and discharging voltage and current, and charging and discharging voltage.

[0029] Further, in order to avoid the duration of mains power outage exceeding the total duration of power supply of the lithium iron phosphate battery pack and the lead-acid battery pack, thereby causing the load to be powered off, an oil engine power generation device is added. Figure 2 As shown, the oil engine power generation device is connected to the input end and the mains detection circuit. When the mains power is off, the oil engine power generation device automatically starts to generate power. Specifically, when the mains power is off, the mains detection circuit outputs a detection signal, and the oil engine power generation device automatically starts after receiving the detection signal. During the starting process of the oil engine power generation device, the lithium iron phosphate battery pack or the lead-acid battery pack supplies power to the load, and after the oil engine power generation device is started, the switching power supply supplies power to the load. In particular, the detection signal is a high level or a low level.

[0030] Further, a fuse is connected between the negative pole of the output end of the switching power supply and the bidirectional DC-DC step-up and step-down adjustable circuit, which ensures the safe operation of the battery pack.

[0031] Further, the embedded controller and the battery management system are connected by RS485 communication.

[0032] Further, the output voltage of the photovoltaic power generation device is 55V, the discharge voltage of the lithium iron phosphate battery pack is 54.5V, the output voltage of the switching power supply is 54V, and the rated voltage of the load is 54V.

Claims

1. An intelligent power supply system for continuous power supply to a load, characterized in that, The switch power supply, the commercial power, the photovoltaic power generation device, the lead-acid battery pack, the lithium iron phosphate battery pack, the embedded controller, the touch screen and the commercial power detection circuit are connected with each other. The lithium iron phosphate battery pack comprises a battery management system and a bidirectional DC-DC step-up and step-down adjustable circuit, the battery management system is used for monitoring and managing the battery state, and the bidirectional DC-DC step-up and step-down adjustable circuit is used for adjusting the charging voltage and the discharging voltage. The switch power supply comprises an input end and an output end, the input end is connected with the commercial power, and the output end is connected with the lead-acid battery pack, the bidirectional DC-DC step-up and step-down adjustable circuit, the photovoltaic power generation device and the load respectively. The commercial power detection circuit is connected with the commercial power and the embedded controller, and the embedded controller is connected with the battery management system, the bidirectional DC-DC step-up and step-down adjustable circuit and the touch screen respectively. The touch screen is used for displaying the lithium iron phosphate battery state information, setting the charging time, setting the discharging time, setting the charging voltage and setting the discharging voltage. The embedded controller is used for controlling the lithium iron phosphate battery pack to charge at the set charging time and adjusting the bidirectional DC-DC step-up and step-down adjustable circuit so that the charging voltage is equal to the set charging voltage, and controlling the lithium iron phosphate battery pack to discharge at the set discharging time and adjusting the bidirectional DC-DC step-up and step-down adjustable circuit so that the discharging voltage is equal to the set discharging voltage. The commercial power detection circuit is used for detecting whether the commercial power is powered off, and when the commercial power is powered off, the embedded controller controls the lithium iron phosphate battery pack to be in the discharging state and adjusts the bidirectional DC-DC step-up and step-down adjustable circuit so that the discharging voltage is equal to the set discharging voltage. The discharging voltage of the lithium iron phosphate battery pack is lower than the output voltage of the photovoltaic power generation device and higher than the output voltage of the switch power supply, and the discharging voltage of the lead-acid battery pack is lower than the output voltage of the switch power supply.

2. The intelligent power supply system of claim 1, wherein, The oil engine power generation device is connected with the input end and the commercial power detection circuit, and when the commercial power is powered off, the oil engine power generation device is automatically started to generate power.

3. The intelligent power supply system of claim 1, wherein, A fuse is connected between the output end and the bidirectional DC-DC step-up and step-down adjustable circuit.

4. The intelligent power supply system according to any one of claims 1-3, characterized in that, The embedded controller and the battery management system are connected through RS485 communication.

5. The intelligent power supply system according to any one of claims 1-3, characterized in that, The rated voltage of the load is 54V, the output voltage of the photovoltaic power generation device is 55V, the discharging voltage of the lithium iron phosphate battery pack is 54.5V, the output voltage of the switch power supply is 54V, and the output voltage of the lead-acid battery pack is 53.5V.

Images