An uninterruptible power supply

Abstract

The application relates to an uninterrupted power supply and belongs to the technical field of electronic circuits. In the uninterrupted power supply, a switching module is used for electrically connecting commercial power and a battery so that a commercial power input signal or a battery input signal is output as a power input signal; a rectifying module is electrically connected to the switching module and a bus, and is used for converting the power input signal into a first direct current signal and outputting the first direct current signal to the bus; and a bidirectional DC-DC module is used for electrically connecting the bus and the battery, and is used for converting a bus input signal into a second direct current signal and outputting the second direct current signal to the battery in the case that the power input signal is the commercial power input signal, and converting a battery input signal into a third direct current signal and outputting the third direct current signal to the bus in the case that the power input signal is the battery input signal. The uninterrupted power supply can share the supply pressure of the output power of the rectifying module in the battery power supply mode, so that the device utilization rate of the uninterrupted power supply is improved.

Claims

1. An uninterruptible power supply, characterized by include: The switching module is used to electrically connect the mains power and the battery so that the mains power input signal or the battery input signal is output as the power input signal. The rectifier module is electrically connected to the switching module and the bus, and is used to convert the power input signal into a first DC signal and output it to the bus. A bidirectional DC-DC module is used to electrically connect the bus and the battery, so as to convert the bus input signal into a second DC signal and output it to the battery when the power input signal is the AC power input signal, and to convert the battery input signal into a third DC signal and output it to the bus when the power input signal is the battery input signal.

2. The uninterruptible power supply according to claim 1, characterized in that, The uninterruptible power supply also includes a filtering module; the switching module is used to electrically connect to the mains power through the filtering module, so that the filtering module filters the mains power input signal before the mains power input signal is input to the switching module. The filtering module includes a filtering circuit for filtering the single-phase signal of the mains input signal; The switching module includes a first switching circuit and a second switching circuit; the first switching circuit is used to electrically connect the filter circuit and the positive terminal of the battery, and the second switching circuit is used to electrically connect the filter circuit and the negative terminal of the battery. The rectifier module includes a first rectifier circuit and a second rectifier circuit; the first rectifier circuit is electrically connected to the first switching circuit and the bus, and the second rectifier circuit is electrically connected to the second switching circuit and the bus.

3. The uninterruptible power supply of claim 1, wherein, The bidirectional DC-DC module includes: A first bidirectional DC-DC circuit is used to electrically connect the positive busbar of the busbar, the positive terminal of the battery, and the neutral line; the neutral line is used to electrically connect the neutral busbar of the busbar and the ground terminal of the battery; and / or, The second bidirectional DC-DC circuit is used to electrically connect the negative busbar of the busbar, the negative terminal of the battery, and the neutral line.

4. The uninterruptible power supply of claim 3, wherein, The first bidirectional DC-DC circuit includes: A first relay; the first switching terminal of the first relay is used to electrically connect to the positive terminal of the battery; The first inductor has its first terminal electrically connected to the second switching terminal of the first relay. The first capacitor has its first terminal electrically connected to the first terminal of the first inductor, and its second terminal electrically connected to the neutral line. A first switching transistor has its first terminal electrically connected to the second terminal of the first inductor, and its second terminal electrically connected to the neutral line; the conduction current of the first switching transistor flows from its first terminal to its second terminal; the cathode of the body diode of the first switching transistor is electrically connected to the second terminal of the first inductor, and the anode is electrically connected to the neutral line; The second switching transistor has its first terminal electrically connected to the second terminal of the first inductor, and its second terminal electrically connected to the positive busbar. The conduction current of the second switching transistor flows from its second terminal to its first terminal. The anode of the body diode of the second switching transistor is electrically connected to the second terminal of the first inductor, and its cathode is electrically connected to the positive busbar.

5. The uninterruptible power supply of claim 3, wherein, The second bidirectional DC-DC circuit includes: The second relay; the first switching terminal of the second relay is used to electrically connect to the negative terminal of the battery; The first end of the second inductor is electrically connected to the second switching terminal of the second relay. The second capacitor has its first terminal electrically connected to the first terminal of the second inductor and its second terminal electrically connected to the neutral line. The third switch has its first terminal electrically connected to the second terminal of the second inductor, and its second terminal electrically connected to the neutral line; the conduction current of the third switch flows from its second terminal to its first terminal; the anode of the body diode of the third switch is electrically connected to the second terminal of the second inductor, and the cathode is electrically connected to the neutral line. The fourth switching transistor has its first terminal electrically connected to the second terminal of the second inductor, and its second terminal electrically connected to the negative busbar. The conduction current of the fourth switching transistor flows from its first terminal to its second terminal. The cathode of the body diode of the fourth switching transistor is electrically connected to the second terminal of the second inductor, and its anode is electrically connected to the negative busbar.

6. The uninterruptible power supply of claim 1, wherein, The bidirectional DC-DC module is used to electrically connect the positive busbar of the busbar, the negative busbar of the busbar, the positive terminal of the battery, and the negative terminal of the battery.

7. The uninterruptible power supply according to claim 6, characterized in that, The bidirectional DC-DC module includes: A first relay; the first switching terminal of the first relay is used to electrically connect to the positive terminal of the battery; The second relay; the first switching terminal of the second relay is used to electrically connect to the negative terminal of the battery; The first inductor has its first terminal electrically connected to the second switching terminal of the first relay. The first capacitor has its first end electrically connected to the first end of the first inductor and its second end electrically connected to the second switching terminal of the second relay. The first switching transistor has its first terminal electrically connected to the second terminal of the first inductor, and its second terminal electrically connected to the negative busbar. The conduction current of the first switching transistor flows from its first terminal to its second terminal. The cathode of the body diode of the first switching transistor is electrically connected to the second terminal of the first inductor, and its anode is electrically connected to the second switching terminal of the second relay and the negative busbar. The second switching transistor has its first terminal electrically connected to the second terminal of the first inductor, and its second terminal electrically connected to the positive busbar. The conduction current of the second switching transistor flows from its second terminal to its first terminal. The anode of the body diode of the second switching transistor is electrically connected to the second terminal of the inductor, and the cathode is electrically connected to the positive busbar.

8. The uninterruptible power supply of any of claims 1 to 7, wherein, The uninterruptible power supply includes multiple parallel bidirectional DC-DC modules.

9. The uninterruptible power supply of claim 2, wherein, The mains input signal is a three-phase mains signal; The filtering module includes three filtering circuits, namely a first filtering circuit, a second filtering circuit, and a third filtering circuit; the first filtering circuit is used to filter the first phase of the three-phase mains signal, and the second filtering circuit is used to filter the second phase of the three-phase mains signal. The third filter circuit is used to filter the third phase of the three-phase mains signal; The rectifier module includes three sets of rectifier circuits, namely the first set of rectifier circuits, the second set of rectifier circuits, and the third set of rectifier circuits; each set of rectifier circuits includes two rectifier circuits, namely the first rectifier circuit and the second rectifier circuit. The switching module includes three sets of switching circuits, namely a first set of switching circuits, a second set of switching circuits, and a third set of switching circuits; each set of switching circuits includes two switching circuits, namely the first switching circuit and the second switching circuit. The first switching circuit in the first set of switching circuits is used to electrically connect the first filter circuit, the positive terminal of the battery, and the first rectifier circuit in the first set of rectifier circuits. The second switching circuit in the first set of switching circuits is used to electrically connect the first filter circuit, the negative terminal of the battery, and the second rectifier circuit in the first set of rectifier circuits. The first switching circuit in the second set of switching circuits is used to electrically connect the second filter circuit, the positive terminal of the battery, and the first rectifier circuit in the second set of rectifier circuits; the second switching circuit in the second set of switching circuits is used to electrically connect the second filter circuit, the negative terminal of the battery, and the second rectifier circuit in the second set of rectifier circuits. The first switching circuit in the third set of switching circuits is used to electrically connect the third filter circuit and the positive terminal of the battery, and the second switching circuit in the third set of switching circuits is used to electrically connect the third filter circuit and the negative terminal of the battery.

10. The uninterruptible power supply of claim 2, wherein, The first rectifier circuit and the second rectifier circuit are two rectifier circuits in a set of rectifier circuits; the first switching circuit and the second switching circuit are two switching circuits in a set of switching circuits. The rectifier circuit includes a third inductor, a third diode, a fourth diode, and a bidirectional switching transistor; The first end of the third inductor is electrically connected to the corresponding switching circuit, and the second end is used to electrically connect the anode of the third diode, the cathode of the fourth diode, and the first end of the bidirectional switching transistor. The cathode of the third diode is electrically connected to the positive busbar of the busbar; The anode of the fourth diode is electrically connected to the negative busbar of the busbar; The second terminal of the bidirectional switch is electrically connected to the neutral line.

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