CN-122001051-A - Power supply apparatus

Abstract

The application discloses power supply equipment, which relates to the technical field of power electronics and comprises an energy storage battery, a battery management unit and a filter capacitor, wherein the energy storage battery is used for being connected with a power converter and comprises a sampling interface and a power interface, the battery management unit is connected between the sampling interfaces at two ends of the energy storage battery and used for detecting operation data of the energy storage battery, the filter capacitor is connected between the power interfaces at two ends of the energy storage battery, two ends of the filter capacitor are respectively connected with the sampling interfaces at two ends of the energy storage battery to form a charging loop, the current limiting unit is arranged in the charging loop, and the charging loop is used for charging the filter capacitor before the energy storage battery discharges the power converter or before the power converter charges the energy storage battery, so that the voltage of the filter capacitor reaches a set voltage threshold. Therefore, before the power converter connected with the energy storage battery is electrified, the filter capacitor is precharged, so that the use safety of the equipment is improved.

Inventors

• LI XIANZHE
• Jiang Fuxu
• DAI SHENGYONG

Assignees

• 华为技术有限公司

Dates

Publication Date

20260508

Application Date

20251230

Claims (11)

1. 1. The power supply equipment is characterized by comprising an energy storage battery, a battery management unit, a filter capacitor and a current limiting unit, wherein the energy storage battery is used for being connected with a power converter, and comprises a sampling interface and a power interface; The battery management unit is connected between the sampling interfaces at two ends of the energy storage battery and is used for detecting operation data of the energy storage battery; the filter capacitor is connected between the power interfaces at two ends of the energy storage battery; The two ends of the filter capacitor are respectively connected with the sampling interfaces at the two ends of the energy storage battery to form a charging loop, the current limiting unit is arranged in the charging loop, and the charging loop is used for charging the filter capacitor before the energy storage battery discharges the power converter or before the power converter charges the energy storage battery, so that the voltage of the filter capacitor reaches a set voltage threshold.
2. 2. The power supply apparatus according to claim 1, wherein the current limiting unit is configured to make a current flowing through the filter capacitor less than or equal to a set current threshold value when the energy storage battery charges the filter capacitor.
3. 3. The power supply apparatus according to claim 1 or 2, wherein the current limiting unit includes a first current limiting component connected between the sampling interface at one end of the energy storage battery and one end of the filter capacitor.
4. 4. The power supply of claim 3, wherein the first current limiting component comprises at least one of a fixed resistor or a thermistor.
5. 5. A power supply device as claimed in claim 3, characterized in that the current limiting unit further comprises a diode connected between the first current limiting component and one end of the filter capacitor.
6. 6. The power supply apparatus according to any one of claims 3 to 5, wherein the current limiting unit further comprises a second current limiting component connected between the sampling interface at the other end of the energy storage battery and the other end of the filter capacitor.
7. 7. The power supply of claim 6, wherein the second current limiting component comprises at least one of a fixed resistor, a thermistor, or an inductance.
8. 8. The power supply equipment is characterized by comprising an energy storage battery, a filter capacitor and a switching tube, wherein the energy storage battery is used for being connected with a power converter; the filter capacitor and the switch tube are connected in series between two ends of the energy storage battery; The switch tube is used for conducting in a plurality of continuous switch cycles with a set duty ratio before the energy storage battery discharges the power converter or before the power converter charges the energy storage battery so as to charge the filter capacitor, so that the voltage of the filter capacitor reaches a set voltage threshold.
9. 9. The power supply apparatus according to claim 8, wherein the switching tube is configured to make a current flowing through the filter capacitor less than or equal to a set current threshold when the energy storage battery charges the filter capacitor.
10. 10. A power supply device according to claim 8 or 9, characterized in that the on-duty of the switching tube in adjacent switching cycles is increased in set steps.
11. 11. The power supply apparatus according to claim 8 or 9, wherein the switching tube is further configured to be turned on when the voltage of the filter capacitor reaches the set voltage threshold.

Description

Power supply apparatus Technical Field The application relates to the technical field of power electronics, in particular to power supply equipment. Background With the development of new energy field, the market demand for battery charging and discharging application is increasing day by day, and when the battery is connected with the power converter, because the switching tube in the power converter can produce high frequency switch ripple current and ripple voltage in the turn-on and turn-off process, it is necessary to set up filter capacitor between the battery and the power converter to restrain ripple current and interference signal, guaranteeing the output waveform stability of the power converter, and the filter capacitor can also compensate the voltage fluctuation brought by current mutation when current mutation in the circuit, so as to stabilize the voltage at two ends of the power converter. However, when the power converter starts to work, the battery voltage is applied to two ends of the filter capacitor at the moment of power-on, and the voltage difference between the battery and the filter capacitor causes impact current in the circuit, which is easy to cause overcurrent breakdown of components in the equipment, or overheat damage caused by overlarge instant power consumption, even causes a sparking phenomenon in the equipment, and affects the use safety of the equipment. Disclosure of Invention The application provides power supply equipment, which is used for improving the use safety of the equipment by pre-charging a filter capacitor before a power converter connected with an energy storage battery is electrified. The application provides power supply equipment, which comprises an energy storage battery, a battery management unit, a filter capacitor and a current limiting unit, wherein the energy storage battery is used for being connected with a power converter, the energy storage battery comprises sampling interfaces and power interfaces, the battery management unit is connected between the sampling interfaces at two ends of the energy storage battery and is used for detecting operation data of the energy storage battery, the filter capacitor is connected between the power interfaces at two ends of the energy storage battery, two ends of the filter capacitor are respectively connected with the sampling interfaces at two ends of the energy storage battery to form a charging loop, the current limiting unit is arranged in the charging loop, and the charging loop is used for charging the filter capacitor before the energy storage battery discharges the power converter or before the power converter charges the energy storage battery, so that the voltage of the filter capacitor reaches a set voltage threshold. In the power supply device provided in this embodiment, a current limiting unit is disposed between sampling interfaces of the filter capacitor and the energy storage battery, so that a branch connected with a power line through a power interface is formed between the filter capacitor and the energy storage battery, and a branch connected with the current limiting unit through the sampling line. Before the energy storage battery discharges the power converter, or before the power converter charges the energy storage battery, the filter capacitor is charged through the branch where the sampling line and the current limiting unit are located, when the power converter is electrified, as the impedance of the branch where the power line is located is far smaller than that of the branch where the current limiting unit is located, the current flowing through the branch where the power line is located is far greater than that of the branch where the current limiting unit is located, the conduction loss of the branch where the current limiting unit is located is small, and more electric energy is used for charging the energy storage battery or supplying power to load by power supply equipment, so that the energy conversion efficiency of the power supply equipment is ensured. And the filter capacitor is precharged before the power converter is electrified, the safe charging of the filter capacitor is ensured by the use of the current limiting unit, and the excessive charging current in the power supply equipment can be avoided when the power converter is electrified after the voltage of the filter capacitor is charged to reach the set voltage threshold value, so that the filter capacitor is prevented from being damaged or the sparking phenomenon is avoided. In some embodiments, the current limiting unit is configured to make a current flowing through the filter capacitor less than or equal to a set current threshold when the energy storage battery charges the filter capacitor. In this embodiment, the current limiting unit is disposed between the filter capacitor and the sampling interface of the energy storage battery, and when the current limiting unit is connected with the two ends of the filt