TWM459612U - Uninterruptable power supply system - Google Patents

Description

Uninterruptible power supply system

The present invention is to provide an uninterruptible power supply system, and in particular to a full bridge type uninterruptible power supply system.

The conventional uninterruptible power supply system continuously supplies power to the load continuously, and the output water line end (Neutral, N) of some of the uninterruptible power supply systems is suspended relative to the mains input water line end. Therefore, there is a floating potential between the output water line end and the output ground line end, and the floating potential needs to make the voltage level between the output water line end and the output ground line end be within a certain voltage range according to the requirements of the specific application equipment. Operation, for example, operating in the range of 8 to 10 Vac, or operating in the range of 1 to 2 Vac based on the potential between the input water line end and the input ground terminal, therefore, some uninterruptible power supply systems There is a potential imbalance or it is not safe to supply power to the load.

In addition, some UPS power supply systems use isolation transformers to meet the application requirements of the above specific application equipment. However, the UPS power supply system is equipped with an isolation transformer, which will increase the installation cost and space, and reduce the UPS. The overall power conversion efficiency of the supply system.

The present invention aims to provide an uninterruptible power supply system to solve the above problems.

This creation proposes an uninterruptible power supply system, coupled to a mains, mains The utility model has an input hot line end and an input water line end, and the uninterruptible power supply system comprises a rectification circuit, a power correction conversion circuit, an inverter conversion circuit, an LC circuit, a first output switch and a second output switch. With a relay switch. The rectifier circuit is coupled to the mains. The power correction conversion circuit is coupled to the rectifier circuit. The power correction conversion circuit has an independent driving unit and a switching unit, and the independent driving unit is configured to control the conduction and the off of the switching unit. The inverter conversion circuit is coupled to the power correction conversion circuit. The LC circuit is coupled between an output water line end and an output ground line end. The first output switch is coupled between the LC circuit and the inverter conversion circuit. The second output switch is coupled between the inverter conversion circuit and an output fire terminal. The relay switch is coupled between the input water line terminal and the LC circuit. Wherein, when the relay switch is turned on, the input water line end is connected to the output water line end through the LC circuit.

In an embodiment of the present invention, the rectifier circuit is a full bridge circuit, and the IC circuit includes a first inductor and a first capacitor, and the first inductor is coupled between the relay switch and the first capacitor, and the first capacitor It is coupled between the output water line end and the output ground line end.

In an embodiment of the present invention, the first output switch has a first common end, a first switching end and a second switching end, the first common end is coupled to the output water line end, and the first switching end is coupled to the input. The water line end, the second switching end is coupled to the inverter conversion circuit, and the second output switch has a second common end, a third switching end and a fourth switching end, and the second common end is coupled to the output fire end, The three switching ends are coupled to the input live line end, and the fourth switching end is coupled to the inverter conversion circuit.

In an embodiment of the present invention, the inverter conversion circuit further includes an output capacitor having a first side end and a second side end, the first side end being coupled to the second switching end of the first output switch, The second side end of the output capacitor is coupled to the fourth switching end of the second output switch.

The continual power supply system of the present invention passes through the relay switch, so that the input water line end and the output water line end form a common water line state, thereby inputting the water line end, the input ground line end, and the output water line. The terminal and output ground terminals are maintained at a low potential to meet the needs of specific application equipment, thereby improving the ease of use of the uninterruptible power supply system.

The above description of the present invention and the following description of the embodiments are provided to illustrate and explain the principles of the present invention, and to provide further explanation of the scope of the patent application of the present invention.

1, 1a, 1b‧‧‧ Uninterruptible power supply system

10, 10a, 10b‧‧‧ rectifier circuit

12, 12a, 12b‧‧‧ power correction conversion circuit

120, 120a, 120b‧‧‧ independent drive unit

122, 122a, 122b‧‧‧ switch unit

16, 16a, 16b‧‧‧ LC circuit

I1‧‧‧first inductance

C1‧‧‧ a first capacitor

18, 18a, 18b‧‧‧ relay switch

S1‧‧‧ first output switch

124b‧‧‧ booster circuit

I2‧‧‧second inductance

C2‧‧‧second capacitor

D1‧‧‧First Diode

D2‧‧‧ second diode

14, 14a, 14b‧‧‧Inverter conversion circuit

141b‧‧‧First switch circuit

142b‧‧‧Second switch circuit

143b‧‧‧inductor circuit

Q1‧‧‧First switching element

Q2‧‧‧Second switching element

Q3‧‧‧ Third switching element

Q4‧‧‧fourth switching element

Co‧‧‧ output capacitor

Co1‧‧‧ first side

Co2‧‧‧ second side

S10‧‧‧First common end

S11‧‧‧ first switch end

S12‧‧‧Second switching end

S2‧‧‧second output switch

S20‧‧‧ second common end

S21‧‧‧ third switching end

S22‧‧‧ fourth switching end

L1‧‧‧ input firewire end

L2‧‧‧ output firewire end

N1‧‧‧ input water line end

N2‧‧‧ output water line end

E1‧‧‧ input ground terminal

E2‧‧‧ output ground end

20a, 20b‧‧‧ first electromagnetic interference filter circuit

22a, 22b‧‧‧second electromagnetic interference filter circuit

24a, 24b‧‧‧ relay unit

19, 19a, 19b‧‧‧ phase lock control circuit

FIG. 1 is a functional block diagram of an uninterruptible power supply system according to an embodiment of the present invention.

2 is a functional block diagram of an uninterruptible power supply system according to another embodiment of the present invention.

3 is a circuit diagram of an uninterruptible power supply system in accordance with another embodiment of the present invention of FIG.

FIG. 1 is a functional block diagram of an uninterruptible power supply system according to an embodiment of the present invention. Please refer to Figure 1. An uninterruptible power supply system 1 is coupled to a mains. The mains has an input fire terminal L1 and an input water terminal N1. The uninterruptible power supply system 1 includes a rectifier circuit 10 and a power correction conversion circuit 12 An inverter conversion circuit 14, an LC circuit 16, a first output switch S1, a second output switch S2 and a relay switch 18. In practice, when the utility power is normally supplied, the uninterruptible power supply system 1 provides the output voltage via the rectifier circuit 10, the power correction conversion circuit 12, the inverter conversion circuit 14, the first output switch S1 and the second output switch S2. When a relay (not shown) is turned on, the input water line terminal N1 is connected to the output water line terminal N2 through the LC circuit 16; when the utility power is cut off, the battery module (not shown) is converted through the inverter. The circuit 14 supplies power to the load, thereby achieving an uninterrupted and continuous power supply operation.

The rectifier circuit 10 is coupled between the mains and the power correction conversion circuit 12, and the rectifier circuit 10 is, for example, a full bridge circuit. In practice, the rectifier circuit 10 is, for example, an AC/DC power supply rectifier circuit or a full-wave rectifier circuit to rectify a commercially available waveform such as an AC power source into an input power source for use by a load, which is a full-wave pulse. It is worth noting that the rectifier circuit 10 is not limited thereto, and may be a half-wave rectifier circuit 10.

The power correction conversion circuit 12 is coupled between the rectifier circuit 10 and the inverter conversion circuit 14. The power correction conversion circuit 12 has an independent driving unit 120 and a switching unit 122. The independent driving unit 120 is used to control the conduction and termination of the switching unit 122. . In practice, the power correction conversion circuit 12 is used to correct the power factor, for example, to bring the power factor closer to 1, to improve the efficiency of the power conversion, which is generally freely designed by those skilled in the art as needed.

In detail, the switch unit 122 is, for example, a dual-loaded junction transistor, a power transistor, or a field effect transistor. This embodiment does not limit the aspect of the switch unit 122. The independent driving unit 120 is realized, for example, by driving a wafer or switching a control wafer, and the embodiment does not limit the aspect of the independent driving unit 120. For example, the switching unit 122 is, for example, a dual-loaded junction transistor, and the general driving unit is coupled between the base and the emitter of the dual-loaded junction transistor, and the independent driving unit 120 of the present invention is coupled. The base of the double-loaded junction transistor is connected, whereby the independent driving unit 120 drives the switching unit 122 to be turned on or off in an isolated manner. This embodiment does not limit the aspect in which the independent driving unit 120 drives the switching unit 122.

The inverter conversion circuit 14 is coupled between the power correction conversion circuit 12, the first output switch S1 and the second output switch S2. In practice, the inverter conversion circuit 14 is, for example, an inverter for converting direct current into a standard and stable alternating current, and the inverter conversion circuit 14 transmits the output voltage through the first and second output switches S1 and S2. It is used for the load, whereby the output voltage of the inverter conversion circuit 14 is substantially the same as the load voltage.

The LC circuit 16 is coupled between an output water terminal N2, an output ground terminal E2, and the first output switch S1. In practice, the LC circuit 16 includes a first inductor I1 and a first capacitor C1. The first inductor I1 is coupled between the relay switch 18 and the first capacitor C1. The first capacitor C1 is coupled to the output water terminal N2. Output between the ground terminal E2. Further, the first capacitor C1 and the first inductor I1 are used for filtering or filtering noise. For example, when the utility power is cut off, the voltage of the battery module is converted into the DC required by the inverter conversion circuit 14. The voltage is then converted by the inverter conversion circuit 14 into an alternating current to the load, wherein the first capacitor C1 in the LC circuit 16 can store the electrical energy and be used as a dummy load at the moment of the mains power-off, thereby protecting the load.

In detail, the present design increases the design of the LC circuit 16 to reduce the voltage level of the output water terminal N2 and the output ground terminal E2 of the uninterruptible power supply system 1, for example, the output water terminal N2 and the output ground. The voltage level of the terminal E2 meets the application requirements of the load device, and the design of the isolation transformer is not required for the creation, and the cost of the isolation transformer and the overall efficiency of the continuous power supply system 1 can be saved.

The first output switch S1 is coupled between the LC circuit 16 and the inverter conversion circuit 14, and the second output switch S2 is coupled between the inverter conversion circuit 14 and an output fire terminal L2. In practice, the first and second output switches S1, S2 are, for example, electromagnetic, inductive, electric or electronic relays. This embodiment does not limit the aspects of the first and second output switches S1, S2. The first and second output switches S1 and S2 can be switched synchronously. For example, when the first output switch S1 is in an on state, the second output switch S2 is also in an on state, so that the inverter conversion circuit 14 and the output terminal L2 are output. A closed loop is formed with the output water line terminal N2 to provide an output voltage to the load.

The relay switch 18 is coupled between the input water line terminal N1 and the LC circuit 16. The relay switch 18 is, for example, an electromagnetic, inductive, electric or electronic relay, and the embodiment does not limit the aspect of the relay switch 18. In practice, the relay switch 18 is used to control whether the input water terminal N1 is connected to the output water terminal N2. When the relay switch 18 is turned on, the input water terminal N1 is connected to the output water terminal N2 through the LC circuit 16 so that The input water line end N1 and the output water line end N2 form a common water line state, whereby the input water line end N1, the output water line end N2 and the output ground end E2 maintain a certain low potential to meet a specific application. The need for equipment, in addition, this creation also reduces the chance of users getting an electric shock.

In addition, the uninterruptible power supply system 1 further includes a phase lock control circuit 19 coupled to the relay switch 18, when the output phase of the uninterruptible power supply system 1 is the same as the input phase of the mains, the phase The lock control circuit 19 is used The conduction of the relay switch 18 is controlled such that the input water line terminal N1 is connected to the output water line terminal N2 through the LC circuit 16. In practice, the phase lock control circuit 19 transmits the phase lock control technique to control the on or off of the relay switch 18, for example, the phase lock control circuit 19 detects the line according to the correctness of the wiring of the mains. Fault detector) to detect the input phase of the mains, thereby making the output phase of the uninterruptible power supply system 1 the same as the input phase of the mains.

It should be noted that in other embodiments, the phase lock control circuit 19 can also be implemented by a firmware or a control program, such as the relay switch 18 and the phase lock control circuit 19, which can form a phase lock control program or firmware. The relay is turned on or off according to the input phase and the output phase. When the input phase and the output phase are in the same phase, the relay is turned on for phase locking. This embodiment does not limit the aspect of the phase lock control circuit 19.

2 is a functional block diagram of an uninterruptible power supply system according to another embodiment of the present invention. Please refer to Figure 2. This embodiment is similar to the uninterruptible power supply system 1a, 1 of the foregoing embodiment. For example, the uninterruptible power supply system 1a can also pass through the relay switch 18a to connect the input water line terminal N1 with the output water line terminal N2. Together with the common water line state, the input water line terminal N1, the input ground terminal E1, the output water terminal N2 and the output ground terminal E2 maintain a certain low potential to meet the needs of specific application equipment and reduce the use. The chance of getting an electric shock.

However, there is still a difference between the uninterruptible power supply systems 1a and 1 , wherein the uninterruptible power supply system 1a further includes a first electromagnetic interference filter circuit 20a and a second electromagnetic interference filter circuit 22a, first The electromagnetic interference filter circuit 20a is coupled between the power correction conversion circuit 12a, the input hot line terminal L1, the input water line terminal N1 and an input ground terminal E1, and the second electromagnetic interference filter circuit 22a is coupled to the inverter conversion circuit 14a and the output fire line. End L2, between the output water line end N2 and the output ground end E2. This embodiment does not limit the aspect of the uninterruptible power supply system 1a.

In detail, the electromagnetic interference filter circuit can suppress the electromagnetic noise of the AC voltage. (electromagnetic noise), therefore, the first electromagnetic interference filter circuit 20a is used as electromagnetic interference filtering of a commercial power source such as an alternating current power source, and the second electromagnetic interference filter circuit 22a is used as an electromagnetic interference filter such as an output voltage of an alternating current power source. By using, the present invention satisfies the electromagnetic interference specification through the first and second electromagnetic interference filter circuits 20a, 22a.

It is worth mentioning that the first output switch S1 has a first common terminal S10, a first switching terminal S11 and a second switching terminal S12, and the first common terminal S10 is coupled to the output water terminal N2, the first switching end S11 is coupled to the input water terminal N1, the second switching terminal S12 is coupled to the inverter conversion circuit 14a, and the second output switch S2 has a second common terminal S20, a third switching terminal S21 and a fourth switching terminal S22. The second common terminal S20 is coupled to the output fire terminal L2, the third switching terminal S21 is coupled to the input fire terminal L1, and the fourth switching terminal S22 is coupled to the inverter conversion circuit 14a.

In detail, the first switching end S11 and the third switching end S21 are coupled to the bypass circuit (Bypass), and the second switching end S12 and the fourth switching end S22 are coupled to the inverter switching circuit 14a. When the power supply system 1a forms an overload phenomenon or a fault, the first and second output switches S1, S2 can be coupled to the bypass circuit, whereby the uninterruptible power supply system 1a can still provide an output voltage to the load, which is known in the art. Usually the knowledge can be freely designed as needed.

The inverter switching circuit 14a further includes an output capacitor Co. The output capacitor Co has a first side end Co1 and a second side end Co2. The first side end Co1 is coupled to the second switching end S12 of the first output switch S1. The second side end Co2 of the capacitor Co is coupled to the fourth switching end S22 of the second output switch S2, whereby the inverter switching circuit 14a is transmitted through the second switching end S12 of the first output switch S1 to be coupled to the common water line state. The water line terminal N2 and the LC circuit 16a are output.

In addition, the uninterruptible power supply system 1a further includes a relay unit 24a coupled between the rectifier circuit 10a and the first electromagnetic interference filter circuit 20a. In practice, the relay unit 24a is, for example, an electromagnetic, inductive, electric or electronic relay, and the embodiment does not limit the aspect of the relay unit 24a.

For example, when the state of the relay unit 24a is ON, the relay unit 24a is turned on, so that the rectifier circuit 10a, the power correction conversion circuit 12a, the inverter conversion circuit 14a, and the load terminal circuit form a closed loop state, thereby continuously The electric power supply system 1a supplies power to the load through the commercial power. When the state of the relay unit 24a is OFF, the relay unit 24a is not turned on, so that the rectifier circuit 10a, the power correction conversion circuit 12a, the inverter conversion circuit 14a, and the load terminal circuit form an open state, thereby continuously supplying power. System 1a supplies power to the load through the battery module. In addition to the above differences, those skilled in the art should be able to easily infer from the foregoing embodiments and the above differences, and therefore will not be described herein.

Next, the detailed structure and operation of the uninterruptible power supply system will be further explained.

3 is a circuit diagram of an uninterruptible power supply system in accordance with another embodiment of the present invention of FIG. Please refer to Figure 3. The power correction conversion circuit 12b of the embodiment further includes a booster circuit 124b and a second diode D2. In a practical manner, the boosting circuit 124b is coupled to the switching unit 122b. The boosting circuit 124b includes a first diode D1, a second inductor I2, and a second capacitor C2. The second inductor I2 is coupled to the first diode. The anode of the D1, the switching unit 122b and the rectifier circuit 10b, the second capacitor C2 is connected to the switching unit 122b, the cathode of the second diode D2 is coupled to the switching unit 122b, and the anode of the second diode D2 is coupled. Two capacitors C2.

In detail, when the switching unit 122b is in the off state, the boosting circuit 124b charges the second capacitor C2. When the switching unit 122b is in the conducting state, the second inductor I2 discharges current through the switching unit 122b, and the second capacitor C2 discharges. Inverting conversion circuit 14b, wherein the second diode D2 limits the direction of current flow so that current flows from the anode of the second diode D2 to the cathode, whereby the second diode D2 can be used as a power correction conversion circuit 12b and an electrically isolated operating element of the one-way blocking circuit of the inverter switching circuit 14b. This embodiment does not limit the aspect of the second diode D2 and the booster circuit 124b.

The inverter conversion circuit 14b further includes a first switch circuit 141b and a second switch. The circuit 142b is coupled to an inductor circuit 143b, the first switch circuit 141b is connected to the second switch circuit 142b, the output capacitor Co is coupled between the first switch circuit 141b and the second switch circuit 142b, and the inductor circuit 143b is connected in series with the output capacitor Co. The first switching circuit 141b includes a first switching element Q1 and a second switching element Q2, and the second switching circuit 142b includes a third switching element Q3 and a fourth switching element Q4, wherein the first, second, and The turn-on and turn-off operations of the third and fourth switching elements Q1, Q2, Q3, and Q4 are the same as those of a general inverter, and will not be described herein.

In summary, the creation is an uninterruptible power supply system, and the uninterruptible power supply system passes through a relay switch to form a common water line state in which the input water line end and the output water line end are connected together. The input water line terminal, the input ground terminal, the output water terminal and the output ground terminal are maintained at a low potential to meet the requirements of the specific application device. In addition, the power correction conversion circuit has an independent driving unit, a switching unit, a boosting circuit and a second diode, wherein the independent driving unit is used to control the switching unit to be turned on or off, and the second diode is used for the second diode. As an electrically isolated operating element of the one-way blocking circuit of the power correction conversion circuit and the inverter conversion circuit. In addition, the LC circuit can make the voltage level of the output water line end and the output ground line terminal a low voltage level. In this way, the creation of the continuous power supply system improves the convenience of operation.

In summary, this creation has already met the requirements of the new patent and applied in accordance with the law. However, the above disclosures are only preferred embodiments of the present invention, and the scope of rights of the present invention cannot be limited thereto. Therefore, the equal changes or modifications made according to the scope of the application of the present application are still covered by the present application.

1‧‧‧Continuous power supply system

10‧‧‧Rectifier circuit

12‧‧‧Power Correction Conversion Circuit

120‧‧‧Independent drive unit

122‧‧‧Switch unit

14‧‧‧Inverter conversion circuit

16‧‧‧LC circuit

I1‧‧‧first inductance

C1‧‧‧first capacitor

18‧‧‧ Relay switch

19‧‧‧ Phase Lock Control Circuit

S1‧‧‧ first output switch

S2‧‧‧second output switch

L1‧‧‧ input firewire end

L2‧‧‧ output firewire end

N1‧‧‧ input water line end

N2‧‧‧ output water line end

E2‧‧‧ output ground end

Claims (10)

An uninterruptible power supply system coupled to a mains supply, the mains has an input live end and an input water line end, the uninterruptible power supply system includes: a rectifying circuit coupled to the mains; a power correction conversion a circuit, coupled to the rectifier circuit, the power correction conversion circuit has an independent driving unit and a switching unit, the independent driving unit is used to control the switching unit to turn on and off; an inverter conversion circuit coupled to the power correction conversion a circuit, coupled between an output water line end and an output ground line end; a first output switch coupled between the LC circuit and the inverter conversion circuit; and a second output switch coupled Connected between the inverter conversion circuit and an output line terminal; a relay switch coupled between the input water line terminal and the LC circuit; wherein, when the relay switch is turned on, the input water line end passes through the LC A circuit is connected to the output water line end. The uninterruptible power supply system of claim 1, further comprising a phase lock control circuit coupled to the relay switch, when the output phase of the uninterruptible power supply system is the same as the input phase of the mains, The phase lock control circuit controls the conduction of the relay switch such that the input water line end is connected to the output water line end through the LC circuit. The uninterruptible power supply system of claim 1, wherein the rectifier circuit is a full bridge circuit, and the LC circuit includes a first inductor and a first capacitor, the first inductor is coupled to the The first capacitor is coupled between the output water line end and the output ground terminal between the relay switch and the first capacitor. The uninterruptible power supply system of claim 1, wherein the first output switch has a first common end, a first switching end and a second switching end, and the first common end is coupled to the An output water line end, the first switching end is coupled to the input water line end, the second switching end is coupled to the inverter conversion circuit, and the second output is The switch has a second common end, a third switching end and a fourth switching end, the second common end is coupled to the output live line end, the third switching end is coupled to the input live line end, and the fourth switching end is coupled Connect to the inverter conversion circuit. The uninterruptible power supply system of claim 4, wherein the inverter conversion circuit further includes an output capacitor having a first side end and a second side end, the first side end The second switching end of the first output switch is coupled to the second switching end of the second output switch. The uninterruptible power supply system of claim 5, wherein the inverter conversion circuit further comprises a first switch circuit, a second switch circuit and an inductor circuit, wherein the first switch circuit is connected to the first a second switching circuit, the output capacitor is coupled between the first switching circuit and the second switching circuit, and the inductor circuit is connected in series with the output capacitor, the first switching circuit includes a first switching element and a second switch And the second switching circuit includes a third switching element and a fourth switching element. The uninterruptible power supply system of claim 1, further comprising a first electromagnetic interference filter circuit and a second electromagnetic interference filter circuit, wherein the first electromagnetic interference filter circuit is coupled to the power correction conversion circuit, The input electromagnetic line end, the input water line end and an input ground line end, the second electromagnetic interference filter circuit is coupled to the inverter conversion circuit, the output hot line end, the output water line end and the output ground end between. The uninterruptible power supply system of claim 7, further comprising a relay unit coupled between the rectifier circuit and the first electromagnetic interference filter circuit. The uninterruptible power supply system of claim 1, wherein the power correction conversion circuit further includes a boosting circuit coupled to the switching unit, the boosting circuit including a first diode, a first The second inductor is coupled between the anode of the first diode, the switching unit and the rectifier circuit, and the second capacitor is connected to the switching unit. The uninterruptible power supply system of claim 9, wherein the power correction conversion circuit further includes a second diode, the cathode of the second diode is coupled to the switch unit, and the second The anode of the pole body is coupled to the second capacitor.