A backup power supply device and power supply method thereof

Abstract

The present invention relates to a backup power supply device and a power supply method thereof, wherein the device comprises a backup battery, a power switch, a driver, a backup battery voltage detection circuit, a load voltage detection circuit, a load current detection circuit, a mains power supply voltage detection circuit and a controller; each backup battery is electrically connected to the load through a corresponding power switch, and each power switch is electrically connected to the controller through a corresponding driver; the input end of each backup battery voltage detection circuit is electrically connected to the power supply line between the corresponding backup battery and the power switch, and the output end of each backup battery voltage detection circuit is electrically connected to the controller; the input end of the load voltage detection circuit is electrically connected to the power supply line between the common end of all power switches and the load, and the output end of the load voltage detection circuit is electrically connected to the controller. The present invention adopts multi-channel backup batteries to switch power supply without interruption, thereby ensuring the reliability of power supply.

Description

Technical Field

[0001] The invention relates to the field of power supply, and in particular to a backup power supply device and a power supply method thereof. Background Art

[0002] With the development of society, power supply reliability has also been put on the agenda. The backup power supply system in the computer room usually uses a fixed DC battery. When the external AC power is cut off, the backup battery will be put into the system to supply power. However, when the backup battery is exhausted, it can no longer guarantee reliable power supply, which will cause unstable power supply. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a backup power supply device and a power supply method thereof, which can switch power supply without power failure through multiple backup batteries to ensure the reliability of power supply.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a backup power supply device, including a backup battery, a power switch, a driver, a backup battery voltage detection circuit, a load voltage detection circuit, a load current detection circuit, a mains power supply voltage detection circuit and a controller; the backup battery, the power switch, the driver and the backup battery voltage detection circuit are all provided with multiple paths, the backup battery and the backup battery voltage detection circuit have the same number of paths and correspond one-to-one, the backup battery and the power switch have the same number of paths and correspond one-to-one, and the power switch and the driver have the same number of paths and correspond one-to-one; each path of the backup battery is electrically connected to the load through the corresponding power switch, and each path of the power switch is electrically connected to the load through the corresponding driver The controller is electrically connected; the input end of each backup battery voltage detection circuit is electrically connected to the power supply line between the corresponding backup battery and the power switch, and the output end of each backup battery voltage detection circuit is electrically connected to the controller; the input end of the load voltage detection circuit is electrically connected to the power supply line between the common end of all the power switches and the load, and the output end of the load voltage detection circuit is electrically connected to the controller; the load current detection circuit is connected in series to the power supply line between the common end of all the power switches and the load and is electrically connected to the controller; the input end of the AC power supply voltage detection circuit is electrically connected to the AC power supply, and the output end of the AC power supply voltage detection circuit is electrically connected to the controller.

[0005] Based on the above backup power supply device, the present invention also provides a power supply method for the backup power supply device.

[0006] A method for supplying power using a backup power supply device, using the backup power supply device described above to supply power, comprises the following steps:

[0007] S1, through each backup battery voltage detection circuit, the corresponding backup battery output voltage U1 is detected in real time, through the load voltage detection circuit, the voltage U2 at both ends of the load is detected in real time, through the load current detection circuit, the current I flowing into the load is detected in real time, and through the mains power supply voltage detection circuit, the mains power supply voltage U3 supplied to the load is detected in real time;

[0008] S2, if the mains power supply voltage U3 is powered off or the voltage U2 is lower than the first set value, the controller controls the driver corresponding to the backup battery with the highest voltage U1 to drive the corresponding power switch to turn on, so that the backup battery with the highest voltage U1 is put into use;

[0009] S3, if the voltage U1 of the backup battery supplying power to the load is lower than the second set value, another backup battery with the highest voltage U1 is selected from the remaining backup batteries, and the controller controls the corresponding driver to drive the corresponding power switch to turn on, so that the other backup battery with the highest voltage U1 selected from the remaining backup batteries is put into use, and the controller controls the corresponding driver to drive the corresponding power switch to turn off, so that the previously put into use backup battery with a voltage U1 lower than the second set value is removed and put into use;

[0010] S4, when the mains power supply voltage U3 is restored and the current I flows in the reverse direction and the voltage U2 is normal, the backup battery is charged by the mains power supply until the voltage U1 of the backup battery reaches the third set value and is fully charged, and the corresponding driver is controlled by the controller to drive the corresponding power switch to turn off, so that the backup battery that is fully charged is disconnected and put into use;

[0011] S5, if there is still a backup battery whose voltage U1 is lower than the third set value, the backup battery with the lowest voltage U1 is charged until it is fully charged and then disconnected;

[0012] S6, repeating the S5 in a loop until all backup batteries are fully charged.

[0013] The beneficial effects of the present invention are as follows: a backup power supply device and a power supply method thereof adopt multiple backup batteries to switch power supply without power failure, thereby ensuring the reliability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A circuit schematic diagram of a backup power supply device of the present invention;

[0015] Figure 2 A schematic diagram of the circuit structure of a mains power supply voltage detection circuit in a backup power supply device of the present invention;

[0016] Figure 3A schematic diagram of the circuit structure of a backup battery voltage detection circuit or a load voltage detection circuit in a backup power supply device of the present invention;

[0017] Figure 4 The present invention is a flowchart of a power supply method for a backup power supply device. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] Embodiment 1:

[0020] like Figure 1 As shown, a backup power supply device includes a backup battery, a power switch, a driver, a backup battery voltage detection circuit, a load voltage detection circuit, a load current detection circuit, a mains power supply voltage detection circuit and a controller; the backup battery, the power switch, the driver and the backup battery voltage detection circuit are all provided with multiple paths, the backup battery and the backup battery voltage detection circuit have the same number of paths and correspond one-to-one, the backup battery and the power switch have the same number of paths and correspond one-to-one, the power switch and the driver have the same number of paths and correspond one-to-one; each path of the backup battery is electrically connected to the load through the corresponding power switch, and each path of the power switch is electrically connected to the controller through the corresponding driver; each The input end of each backup battery voltage detection circuit is electrically connected to the power supply line between the corresponding backup battery and the power switch, and the output end of each backup battery voltage detection circuit is electrically connected to the controller; the input end of the load voltage detection circuit is electrically connected to the power supply line between the common end of all the power switches and the load, and the output end of the load voltage detection circuit is electrically connected to the controller; the load current detection circuit is connected in series to the power supply line between the common end of all the power switches and the load and is electrically connected to the controller; the input end of the mains power supply voltage detection circuit is electrically connected to the mains power supply, and the output end of the mains power supply voltage detection circuit is electrically connected to the controller. In this specific embodiment, the backup battery is provided with three paths, and in other embodiments, the backup battery can also be provided with two paths, four paths, five paths or more.

[0021] In this specific embodiment, there is also the following preferred solution:

[0022] Preferably, Figure 2As shown, the mains power supply voltage detection circuit includes a voltage transformer PT and an operational amplifier A1, the two input ends of the voltage transformer PT are respectively connected to the neutral line and the live line of the mains power supply through resistors R1 and R2, the two output ends of the voltage transformer PT are respectively connected to the forward input end and the reverse input end of the operational amplifier A1, two reverse parallel diodes D1 and D2 are also connected between the two output ends of the voltage transformer PT, a resistor R3 and a capacitor C1 are connected in parallel between the reverse input end and the output end of the operational amplifier A1, and the output end of the operational amplifier A1 is electrically connected to the controller. In this preferred embodiment, Figure 2 The AC power supply voltage detection circuit in the circuit only detects one phase voltage in the AC power supply. If you need to detect three-phase voltage, you can set up three AC power supply voltage detection circuits. The AC power supply voltage detection circuit uses a voltage transformer and an operational amplifier to convert the AC power supply voltage into a signal suitable for the controller to collect.

[0023] Preferably, Figure 3 As shown, the circuit structure of the backup battery voltage detection circuit is the same as that of the load voltage detection circuit, both of which include an operational amplifier A2, the same-direction input terminal and the reverse input terminal of the operational amplifier A2 are electrically connected to the positive and negative poles of the power supply line between the corresponding backup battery and the power switch through resistors R4 and R5, respectively, the same-direction input terminal of the operational amplifier A2 is also grounded through a resistor R6 and a capacitor C2 connected in parallel, a resistor R7 and a capacitor C3 connected in parallel are connected between the reverse input terminal and the output terminal of the operational amplifier A2, and the output terminal of the operational amplifier A2 is electrically connected to the controller through a resistor R8. In this preferred embodiment, the backup battery voltage detection circuit uses resistor voltage division and then adjusts the backup battery voltage through the operational amplifier to a signal suitable for collection by the controller.

[0024] Preferably, the load current detection circuit is specifically a Hall current sensor. A commercially available Hall current sensor is used to collect the load current (DC current signal) and transmit it to the controller.

[0025] Preferably, the controller is specifically a single-chip microcomputer of the STM32F429VET6 model. The controller is composed of the minimum system of the single-chip microcomputer and can receive and control other units. The controller in this preferred solution uses STM32F429VET6 with an internal integrated ADC, which can collect and detect the power data detected by the backup battery voltage detection circuit, the load voltage detection circuit, the load current detection circuit and the mains power supply voltage detection circuit, and can control the driver to switch the power device of the power switch.

[0026] Preferably, the driver has two power device drivers integrated therein. In this preferred solution, the driver can be a 2SC0115T model driver, which receives a signal from the controller and drives the upper and lower power devices of the same group in the power switch to turn on or off.

[0027] Preferably, each of the power switches includes a plurality of groups of power devices connected in parallel, each group of the power devices consists of two power devices connected in reverse series, and the control electrodes of the two power devices of each group of the power devices in each of the power switches are electrically connected to the controller through the two power device drivers in the corresponding driver respectively; one parallel end of all the power device groups in each of the power switches is electrically connected to the positive electrode of the corresponding backup battery, and the other parallel end of all the power device groups in each of the power switches is electrically connected to the positive electrode of the load, and the negative electrode of the backup battery is electrically connected to the negative electrode of the load. In this preferred embodiment, two power devices are connected in reverse series to open or close the connection between the backup power supply and the load side. The power device can be an NMOS tube, whose model is HY5208, and its temperature rise can be determined according to To confirm, is the rated current of the NMOS tube, R DS is the resistance of the NMOS tube when it is turned on, R BJA When the temperature rise does not meet the actual use conditions, multiple sets of two NMOS tubes in reverse series are connected in parallel to reduce R DS In addition, forced air cooling and water cooling structures can be installed in the power switch to reduce R BJA , to meet the temperature rise requirements.

[0028] Preferably, a power switch protection circuit is provided on each power supply line between the power switch and the load; each power switch protection circuit includes an inductor L, and the inductor L in each power switch protection circuit is connected in series on the power supply line between a parallel end of all the power device groups in the corresponding power switch and the positive electrode of the load, one end of the inductor L is connected to the negative electrode of the corresponding backup battery through capacitor C4, and the other end of the inductor L is connected to the negative electrode of the corresponding backup battery through capacitor C5. In this preferred solution, the inductor is used to limit surge current and protect the power switch.

[0029] Preferably, a first hot-plug connector is provided on the power supply line between the positive pole of each backup battery and a parallel end of all the power device groups in the corresponding power switch; the positive pole of each backup battery is electrically connected to a parallel end of all the power device groups in the power switch through the corresponding first hot-plug connector; a second hot-plug connector is provided on the power supply line between the negative pole of each backup battery and the negative pole of the load, and the negative pole of each backup battery is electrically connected to the negative pole of the load through the corresponding second hot-plug connector. In this preferred embodiment, the first hot-plug connector and the second hot-plug connector are provided so that a new backup battery can be replaced and connected at any time, which is convenient for replacement.

[0030] Embodiment 2:

[0031] like Figure 4 As shown, a backup power supply device power supply method, using the backup power supply device described above to supply power, includes the following steps:

[0032] S1, through each backup battery voltage detection circuit, the corresponding backup battery output voltage U1 is detected in real time, through the load voltage detection circuit, the voltage U2 at both ends of the load is detected in real time, through the load current detection circuit, the current I flowing into the load is detected in real time, and through the mains power supply voltage detection circuit, the mains power supply voltage U3 supplied to the load is detected in real time;

[0033] S2, if the mains power supply voltage U3 is powered off or the voltage U2 is lower than the first set value, the controller controls the driver corresponding to the backup battery with the highest voltage U1 to drive the corresponding power switch to turn on, so that the backup battery with the highest voltage U1 is put into use;

[0034] S3, if the voltage U1 of the backup battery supplying power to the load is lower than the second set value, another backup battery with the highest voltage U1 is selected from the remaining backup batteries, and the controller controls the corresponding driver to drive the corresponding power switch to turn on, so that the other backup battery with the highest voltage U1 selected from the remaining backup batteries is put into use, and the controller controls the corresponding driver to drive the corresponding power switch to turn off, so that the previously put into use backup battery with a voltage U1 lower than the second set value is removed and put into use;

[0035] S4, when the mains power supply voltage U3 is restored and the current I flows in the reverse direction and the voltage U2 is normal, the backup battery is charged by the mains power supply until the voltage U1 of the backup battery reaches the third set value and is fully charged, and the corresponding driver is controlled by the controller to drive the corresponding power switch to turn off, so that the backup battery that is fully charged is disconnected and put into use;

[0036] S5, if there is still a backup battery whose voltage U1 is lower than the third set value, the backup battery with the lowest voltage U1 is charged until it is fully charged and then disconnected;

[0037] S6, repeating the S5 in a loop until all backup batteries are fully charged.

[0038] The backup power supply device and power supply method of the present invention adopt multi-channel backup batteries to switch power supply without power failure, thereby ensuring the reliability of power supply.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A backup power supply device, characterized in that: It includes a backup battery, a power switch, a driver, a backup battery voltage detection circuit, a load voltage detection circuit, a load current detection circuit, a mains power supply voltage detection circuit and a controller; the backup battery, the power switch, the driver and the backup battery voltage detection circuit are all provided with multiple paths, the backup battery and the backup battery voltage detection circuit have the same number of paths and correspond one to one, the backup battery and the power switch have the same number of paths and correspond one to one, the power switch and the driver have the same number of paths and correspond one to one; each path of the backup battery is electrically connected to the load through the corresponding power switch, and each path of the power switch is electrically connected to the controller through the corresponding driver; each path of the backup battery The input end of the battery voltage detection circuit is electrically connected to the power supply line between the corresponding backup battery and the power switch, and the output end of each backup battery voltage detection circuit is electrically connected to the controller; the input end of the load voltage detection circuit is electrically connected to the power supply line between the common end of all the power switches and the load, and the output end of the load voltage detection circuit is electrically connected to the controller; the load current detection circuit is connected in series to the power supply line between the common end of all the power switches and the load and is electrically connected to the controller; the input end of the mains power supply voltage detection circuit is electrically connected to the mains power supply, and the output end of the mains power supply voltage detection circuit is electrically connected to the controller; The load current detection circuit is specifically a Hall current sensor; the controller is specifically a single chip microcomputer of the STM32F429VET6 model.

2. The backup power supply device according to claim 1, characterized in that: The mains power supply voltage detection circuit includes a voltage transformer PT and an operational amplifier A1. The two input ends of the voltage transformer PT are respectively connected to the neutral line and the live line of the mains power supply through a resistor R1 and a resistor R2. The two output ends of the voltage transformer PT are respectively connected to the forward input end and the reverse input end of the operational amplifier A1. Two reverse-parallel diodes D1 and a diode D2 are also connected between the two output ends of the voltage transformer PT. A resistor R3 and a capacitor C1 connected in parallel are connected between the reverse input end and the output end of the operational amplifier A1. The output end of the operational amplifier A1 is electrically connected to the controller.

3. The backup power supply device according to claim 1, characterized in that: The circuit structure of the backup battery voltage detection circuit is the same as that of the load voltage detection circuit, and both include an operational amplifier A2. The same-direction input terminal and the reverse input terminal of the operational amplifier A2 are electrically connected to the positive and negative poles of the power supply line between the corresponding backup battery and the power switch through resistors R4 and R5, respectively. The same-direction input terminal of the operational amplifier A2 is also grounded through a resistor R6 and a capacitor C2 connected in parallel. A resistor R7 and a capacitor C3 connected in parallel are connected between the reverse input terminal and the output terminal of the operational amplifier A2. The output terminal of the operational amplifier A2 is electrically connected to the controller through a resistor R8.

4. The backup power supply device according to any one of claims 1 to 3, characterized in that: Two power device drivers are integrated inside the driver.

5. The backup power supply device according to claim 4, characterized in that: Each of the power switches includes multiple groups of power device groups connected in parallel, each group of the power device groups consists of two power devices connected in reverse series, and the control electrodes of the two power devices in each group of the power device groups in each of the power switches are electrically connected to the controller through the two power device drivers in the corresponding driver respectively; one parallel end of all the power device groups in each of the power switches is electrically connected to the positive electrode of the corresponding backup battery, and the other parallel end of all the power device groups in each of the power switches is electrically connected to the positive electrode of the load, and the negative electrode of the backup battery is electrically connected to the negative electrode of the load.

6. The backup power supply device according to claim 5, characterized in that: A power switch protection circuit is provided on each power supply line between the power switch and the load; each power switch protection circuit includes an inductor L, and the inductor L in each power switch protection circuit is connected in series on the power supply line between a parallel end of all the power device groups in the corresponding power switch and the positive electrode of the load, one end of the inductor L is connected to the negative electrode of the corresponding backup battery through a capacitor C4, and the other end of the inductor L is connected to the negative electrode of the corresponding backup battery through a capacitor C5.

7. The backup power supply device according to claim 5 or 6, characterized in that: A first hot-plug connector is provided on the power supply line between the positive electrode of each backup battery and a parallel end of all the power device groups in the corresponding power switch; the positive electrode of each backup battery is electrically connected to a parallel end of all the power device groups in the power switch through the corresponding first hot-plug connector; a second hot-plug connector is provided on the power supply line between the negative electrode of each backup battery and the negative electrode of the load, and the negative electrode of each backup battery is electrically connected to the negative electrode of the load through the corresponding second hot-plug connector.

8. A power supply method for a backup power supply device, characterized in that: The method of supplying power using the backup power supply device according to any one of claims 1 to 7 comprises the following steps: S1, through each backup battery voltage detection circuit, the corresponding backup battery output voltage U1 is detected in real time, through the load voltage detection circuit, the voltage U2 at both ends of the load is detected in real time, through the load current detection circuit, the current I flowing into the load is detected in real time, and through the mains power supply voltage detection circuit, the mains power supply voltage U3 supplied to the load is detected in real time; S2, if the mains power supply voltage U3 is powered off or the voltage U2 is lower than the first set value, the controller controls the driver corresponding to the backup battery with the highest voltage U1 to drive the corresponding power switch to turn on, so that the backup battery with the highest voltage U1 is put into use; S3, if the voltage U1 of the backup battery supplying power to the load is lower than the second set value, another backup battery with the highest voltage U1 is selected from the remaining backup batteries, and the controller controls the corresponding driver to drive the corresponding power switch to turn on, so that the other backup battery with the highest voltage U1 selected from the remaining backup batteries is put into use, and the controller controls the corresponding driver to drive the corresponding power switch to turn off, so that the previously put into use backup battery with a voltage U1 lower than the second set value is removed and put into use; S4, when the mains power supply voltage U3 is restored and the current I flows in the reverse direction and the voltage U2 is normal, the backup battery is charged by the mains power supply until the voltage U1 of the backup battery reaches the third set value and is fully charged, and the corresponding driver is controlled by the controller to drive the corresponding power switch to turn off, so that the backup battery that is fully charged is disconnected and put into use; S5, if there is still a backup battery whose voltage U1 is lower than the third set value, the backup battery with the lowest voltage U1 is charged until it is fully charged and then disconnected; S6, repeating the S5 in a loop until all backup batteries are fully charged.

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