CN1042685C - Uninterruptible power supply device and method - Google Patents

Abstract

The invention relates to a power supply device without power interruption, which comprises an inverter and a standby power supply device; it is characterized in that the uninterruptible power supply device further comprises: a switch control device for generating first and second switch control signal outputs in response to a power input current; first and second charge/discharge devices for performing charge/discharge operations using the power supply input current and the standby power supply current; first and second potential supply devices for receiving the discharged charging energy to be maintained at a fixed potential at any time, and first and second switches for serving as charging/discharging paths for the first and second charging/discharging devices during charging/discharging operations in response to first and second switch control signals, respectively. The invention also provides a method for supplying the uninterruptible power supply.

Description

Uninterruptible power supply device and method

The present invention relates to a power supply device and method, especially to an uninterruptible power supply device and method.

Please refer to Fig. 1, which is a schematic diagram of the topology of a traditional uninterruptible power supply system, wherein, from Fig. 1, we can see that the traditional method is to prevent the load device 5 from being supplied by the input terminal L of the power supply Due to the interruption or instability of the power supply, it is necessary to electrically connect the rectifier (Converter) 1, the inverter (Inverter) 2, the DC potential conversion device 3 and the backup power supply device 4 into a topology as shown in Figure 1 (wherein , mark N as the power ground terminal).

Also, the topology structure of another traditional uninterruptible power supply system is shown in FIG. 2 . Please refer to FIG. 2 . In the figure, the rectification device 1 inputs power from the power input terminal L for rectification, wherein the rectification device 1 Can include rectifier circuit 11 and power factor correction (PFC) circuit 12; As for backup power supply device 2, then still as described in Fig. The output terminal 21 of the standby power supply device 2 is then connected to the PFC circuit 12 instead. Of course, the control of the PFC circuit 12 is completed by the PFC control circuit 3; and the output signal of the PFC circuit 12 is then sent to a DC potential conversion device 4 to convert the output signal into a DC signal output with the same electrical potential with electrical isolation, and then convert the DC current into an AC current output by the inverter device 5 to provide a stable and uninterrupted power supply for the load device 6 power supply.

Certainly, in order to further illustrate the typical circuit structure inside the block in FIG. 2, please refer to FIG. 2, which shows the common typical circuit structure of the rectifier circuit 11, the PFC circuit 12 and the DC potential conversion device 4, and its operating principle should be Those who are familiar with the technology can easily know it, and will not repeat it here.

To sum up, no matter the topology shown in Figure 1 or Figure 2, the traditional uninterruptible power supply device has the following disadvantages:

1. Since the traditional uninterruptible power supply system has an electrically isolated DC potential conversion device, the entire uninterruptible power supply system will occupy a relatively large size and weight;

2. Furthermore, in the traditional method, since the power supply from the input terminal to the load device has to go through: AC current conversion to DC current (AC/DC), isolated DC current conversion to DC current (DC/DC) and DC current conversion It is a stage of continuous conversion such as alternating current (DC/AC), so the overall conversion efficiency will be greatly reduced due to too frequent conversion;

3. In addition, the traditional uninterruptible power supply system is obviously more complicated, so the cost of use is obviously higher, thus reducing the reliability of the system during operation.

In order to improve the shortcomings of the above-mentioned traditional methods, the inventor has developed an uninterruptible power supply device and method with high stability, high efficiency, low cost, and small volume after intensive research.

The main purpose of the present invention is to provide an uninterruptible power supply device and method with high power conversion efficiency.

Another object of the present invention is to provide a highly stable uninterruptible power supply device and method.

Another object of the present invention is to provide an uninterruptible power supply device with simple structure and low cost.

Another object of the present invention is to reduce the size and weight of the uninterruptible power supply device.

The present invention relates to an uninterruptible power supply device, which is used to provide a load device with a stable power supply that is not affected by the presence or absence of an externally input power input current, wherein the uninterruptible power supply device includes converting the input current of an AC power supply into a direct current A rectifying device for current output, an inverter device for converting input direct current into alternating current for use by the load device, and a backup power device for use by the load device; the load device is connected to the inverter device; the uninterruptible power supply The power supply unit also includes:

A switch control device, in response to the input current of the power supply, generates first and second switch control signal outputs;

The first and second charging/discharging devices are both connected to the rectifying device and the backup power supply device, and the first and second charging/discharging devices use the rectified power input current and the backup power supply device Output backup power supply current for charge/discharge action;

The first and second potential supply devices are respectively connected to the first and second charge/discharge devices, both the first and second potential supply devices are connected to the inverter device, and the second potential supply The device is connected to the first potential supply device, and the first and second potential supply devices are used to receive the charging energy released from the first or second charging/discharging device due to the discharging action, so as to keeping the first or second potential supply device at a fixed potential at any time, and outputting the fixed potential to the inverter device for use by the load device; and

The first and second switches are connected to the switch control device, and the first switch is connected to the first charge/discharge device and the first potential supply device, and the second switch is connected to the first potential supply device. A switch is connected to the second charge/discharge device and the second potential supply device, and the first and second switches are used to respond to the first and second switch control signals respectively as the first The charging/discharging paths of the first and second charging/discharging devices when performing charging/discharging operations.

Certainly, wherein the ground terminal of the power supply is connected to the first and second switches, the first and second potential supply devices, the inverter device and the switch control device; and the rectification device includes a series connection The first and second rectifier diodes are electrically connected.

Of course, the rectifying device further includes an input power control switch, and the power input current is input to the mutual electrical connection between the first and second rectifying diodes through the input power control switch.

Certainly, wherein said backup power supply device includes a storage battery.

Certainly, wherein the backup power supply device also includes a backup power charging device, which uses the power input current to keep the potential of the storage battery at a fixed potential; and the backup power supply device also includes a backup power control switch, the The backup power supply device is connected with the switch control device, and the backup power supply control switch determines whether the backup power supply device replaces the input current of the power supply to become the power supply source of the load device.

Of course, the backup power supply device further includes a diode connected in series with the backup power control switch to protect the backup power control switch and the storage battery.

Certainly, wherein said switch control device includes:

A power detection device, used to detect whether there is an input current of the power supply, and if so, generate an output power presence induction signal;

The phase locking device, in response to the input current of the power supply, generates a phase locking signal having the same phase as the input current of the power supply when the input current of the power supply is in the input state, and generates a phase locking signal having the same phase as the input current of the power supply, and when the input current of the power supply is in the state of no current input , the phase locking signal output by the phase locking device still maintains the original phase; and

The switch control signal generating device is connected with the power detection device and the phase locking device, and the switch control signal generating device responds to the power presence sensing signal and the phase locking signal to generate the first and second A switch control signal is used to control the first and second switches.

Certainly, wherein the power supply presence sensing signal is used as the third switch control signal, when the power supply input current is in the current input state, control the input power control switch and the backup power control switch so that they are turned on respectively and the off state, and when the power input current is in the no-current input state, control the input power control switch and the backup power control switch so that they are respectively in the off state and the on state.

Of course, the phase locking device is a phase locked loop device.

Of course, wherein the switch control signal generating device includes:

A full-wave rectifier circuit for converting the input current of the AC power supply into a DC current output;

a differential amplifier circuit, used to generate a low-potential DC output in response to the potential at both ends of the storage battery;

a feedback compensation circuit for outputting a lower filtered potential signal in response to the potential signals across the first and second potential supply devices;

a current sensing device for generating a current sensing signal in response to the output signals of the first and second switches;

A power factor correction integrated circuit, connected to the full-wave rectification circuit, the differential amplifier circuit, the feedback compensation circuit, and the current sensing circuit, to generate an output power factor correction signal; and

The optical coupling driving signal output device is connected with the power factor correction integrated circuit, and the optical coupling driving signal output device generates the control signals of the first and second switches in response to the power factor correction signal.

Of course, the optical coupling driving signal output device includes at least two groups of optical coupling drivers.

Of course, the first and second charging/discharging devices both include an inductor.

Of course, both the first and second potential supply devices include a capacitor.

Of course, both the first and second potential supply devices include a diode to protect the capacitor.

Of course, the first and second switches both include a transistor switch.

Of course, the first and second switches are in the first or second switch state in response to the first and second switch control signals respectively.

Of course, the first and second switch states are respectively on and off states.

Of course, the first and second switches also include a current sensing device, and the current sensing device reacts the change of the current flowing through the transistor switch to its secondary side circuit, so that the secondary side circuit Outputting the current sensing signal for use by the power factor correction integrated circuit.

Regarding an uninterruptible power supply method of the present invention, it can be used in an uninterruptible power supply device to provide a load device with a stable power supply that is not affected by the presence or absence of an externally input power input current, and the uninterruptible power supply device includes The switch control device and the first and second potential supply devices, wherein, the switch control device generates a phase lock signal and a first and second switch control signal output in response to the input current of the power supply, and is characterized in that the The method includes the following steps:

a) When the input current of the power supply is in the current input state and the phase locking signal is in the first working state, the first switch control signal is in the first and second control states and alternates periodically with each other, and the The second switch control signal is in one of the first or second control states, so that the first potential supply device provides a stable power supply for use by the load device;

b) When the input current of the power supply is in a current input state and the phase locking signal is in a second working state, the first switch control signal is in one of the first or second control states, and the first switch control signal is in one of the first or second control states, and the first The two switch control signals change alternately and periodically in the first and second control states, so that the second potential supply device provides a stable power supply for use by the load device;

c) when the input current of the power supply is in the no-current input state and the phase locking signal is in the first working state, the first switch control signal is in the first or second control state and alternates periodically with each other, and The second switch control signal is in the first control state, so that the first potential supply device continuously provides stable power for use by the load device; and

d) When the power supply input current is in the no-current input state and the phase lock signal is in the second working state, the first switch control signal is in the first control state, and the second switch The control signal changes alternately and periodically in the first and second control states, so that the second potential supply device can continuously provide stable power for use by the load device.

Certainly, wherein said uninterruptible power supply device also includes:

A rectifying device, used to rectify the input current of the AC power supply into a DC current;

The inverter device is used to convert the input direct current into an alternating current output to supply the load device;

A backup power supply device, configured to output a backup power supply current for use by the load device;

The first and second charging/discharging devices use the power input current and the standby power current to perform charging/discharging operations; and

The first and second switches are used to respond to the first and second switch control signals respectively, and serve as the charging/discharging path when the first and second charging/discharging devices perform the charging/discharging operation;

Wherein carrying out the described step (a) of above-mentioned method also comprises the following steps before:

a1) Detect the input current of the power supply, when the input current of the power supply is in the state of current input, the switch control device makes the backup power supply device in the disconnected state, and when the input current of the power supply is in the state of no current input , so that the standby power supply device is in a supply state.

Of course, wherein in response to the first switch control signal being in the first and second control states, the first switch is in the first and second switch states respectively, and in response to the second switch control signal being in the first In the first and second control states, the second switch is in the first and second switch states respectively.

Of course, the first and second switch states are respectively on and off states.

Of course, when the first switch is in the open state in the step (a), the first charging/discharging device inputs the rectified power input current to perform the charging operation, and the When the first switch is in the closed state, the first charging/discharging device performs the discharging operation to provide the charging energy charged from the input current of the power supply to the first potential supply device, so that The first potential supply device is maintained at a fixed potential for use by the load device.

Of course, when the second switch is in the on state in the step (b), the second charging/discharging device inputs the rectified input current of the power supply to perform the charging operation, the When the second switch is in the closed state, the second charging/discharging device performs the discharging operation to provide the charging energy charged from the input current of the power supply to the second potential supply device, so that The second potential supply device is maintained at a fixed potential for use by the load device.

Of course, when the first and second switches are both in the open state in the step (c), the first and second charging/discharging devices input the backup power supply current to perform the charging operation , when the first switch is in the closed state and the second switch is still in the open state, the first and second charging/discharging devices perform the discharging operation to transfer the current from the backup power supply The charging energy charged there is provided to the first potential supply device, so that the first potential supply device can be continuously maintained at a fixed potential for use by the load device.

Of course, when the first and second switches are both in the open state in the step (d), the first and second charging/discharging devices input the backup power supply current to perform the charging operation , when the second switch is in the closed state and the first switch is still in the open state, the first and second charging/discharging devices perform the discharging operation, so as to recharge from the backup power supply device The charging energy charged there is provided to the second potential supply device, so that the second potential supply device can continuously maintain a fixed potential for use by the load device.

Of course, the first and second working states are respectively a high potential state and a low potential state.

Of course, the first and second working states are respectively a low potential state and a high potential state.

Of course, the first and second control states are respectively a high potential state and a low potential state.

Of course, the first and second control states are respectively a low potential state and a high potential state.

The present invention can be understood more deeply with the help of the following drawings and detailed description.

FIG. 1 is a schematic diagram of a topology of a traditional uninterruptible power supply system.

FIG. 2 is a schematic diagram of the topology of another traditional uninterruptible power supply system.

FIG. 3 is an example diagram of a typical internal circuit of some blocks in FIG. 2 .

FIG. 4 is a schematic diagram of a topological structure of a preferred embodiment of the present invention.

Fig. 5 is an example diagram of an actual circuit of a device in a preferred embodiment of the present invention.

Fig. 6 is an example diagram of the internal circuit of the switch control signal generating device in the preferred embodiment of the present invention.

Fig. 7(a), (b) is a schematic diagram of the signal relationship between the phase locking signal and the first and second switch control signals in the method of a preferred embodiment of the present invention.

Figure 8(a)-(b) is a schematic diagram of the actual operation of the circuit in the device of the preferred embodiment of the present invention in accordance with the relationship between the signals shown in Figure 7 .

Please refer to Fig. 4, which is a schematic diagram of a topological structure of a preferred embodiment of the present invention, wherein, the power input current input from the power input terminal L is sent to the power rectifier through the power input terminal L and the power ground terminal N processing device 1, and then directly transmit it to the load device 4 through the inverter device 3. At the same time, the backup power supply device 2 only needs to pass through the rectification processing device 1 and the inverter device 3, so that when the power input current is interrupted, As a backup power supply for the load device 4, the structure of the present invention is obviously simpler than that shown in Figs. 1 and 2, and the power conversion efficiency will be greatly improved by reducing the conversion levels.

Please refer to Fig. 5, Fig. 5 is the actual circuit example diagram of a preferred embodiment device of the present invention, comprises in Fig. 5: power rectification processing device 1, standby power supply device 2, inverter device 3 and load device 4; Wherein , the power rectification processing device 1 may include: a rectification device 11, a switch control device 12, a first and a second charging/discharging device 13, 14, a first and a second potential supply device 15, 16 and a first and a second switch 17, 18; and the rectifying device 11 may include first and second rectifying diodes D1, D2 and an input power control switch S3.

Of course, the first and second charging/discharging devices 13, 14 respectively include inductors L1 and L2; and the first and second potential supply devices 15, 16 respectively include diodes D4 through which the charging current flows unidirectionally. , D5 and capacitors C1, C2 that store charges for use by the load device 4; as for the first and second switches 17, 18, there are respectively transistor switches S1, S2 and first-stage current sensing devices CT1, CT2 for sensing the magnitude of the current .

Also, the switch control device 12 may include: a power detection device 121 for generating a power presence sensing signal, a phase lock device 122 for generating a phase lock signal, and a switch control signal generation device 123; wherein the phase lock device 122 may be a phase locked loop (PLL ); the switch control signal generating device 123 may include potential sensing signal input terminals B+, B-, first and second switch control signal output terminals S11, S21 for inputting potential signals of the first and second potential supply devices, and current sensing signal input terminals Terminals CT11, CT12, CT21 and CT22, the first and second power supply presence sensing signal input terminals F, G, power input terminal Lc, ground terminal Nc, backup power supply potential sensing terminals U1, U2 and input phase of the input power supply presence sensing signal The first and second phase locking signal input terminals A and B of the locking signal; wherein, the second power supply presence sensing signal input terminal G inverts the input power supply presence sensing signal, and the second phase locking signal input terminal B is also Invert the input phase-locked signal.

The backup power device 2 may include a battery Vb, a backup power control switch S4 , a power charging device 21 and a diode D3 protecting the battery Vb, the backup power control switch S4 and the power charging device 21 . As shown in Figure 5, the diode D3 is connected in series with the backup power control switch S4.

Of course, in Fig. 5, the power detection device 121, the phase locking device 122, the power charging device 21 and the inverter device 3 are all technologies that should be well-known to those familiar with the art, and in order to reduce the length of the description, they will not be described here. repeat.

Of course, the internal circuit of the switch control signal generating device 123 can be referred to as shown in FIG. 6. In FIG. 1231. The differential amplifier circuit responding to the input signal of the potential sensing terminals U1 and U2 of the backup power supply 1232. The feedback compensation circuit responding to the signal input from the potential sensing signal terminals B+ and B- to stabilize the potential sensing signal terminals B+ and B- 1233, a secondary side current sensing device 1234, a power factor correction (PFC) integrated circuit 1235, and an optical coupling driving signal output device 1236 that respond to the current sensing signal input terminals CT11, CT12, CT21 and CT22; wherein, the optical coupling driving signal The output device 1236 responds to the output signal of the power factor correction integrated circuit 1235 and the phase locking signal, and cooperates with the logic control circuit 12361 to generate the first and second switch control signal outputs, wherein OPT1 and OPT2 are two groups of optical coupling drivers; As for the detailed signal transmission actions between the full-wave rectification circuit 1231, differential amplifier circuit 1232, feedback compensation circuit 1233, and secondary side current sensing device 1234 and PFC IC shown in FIG. 6, it should be well known to those skilled in the art. technology, and will not be repeated here.

As for those marked S11, S21, F, G, Lc, Nc, A, and B in FIG. 6, they mean the first and second switch signal output terminals S11, S21, the first and second power supply in FIG. The signal input terminals F, G, the power input terminal Lc, the power ground terminal Nc and the first and second phase locking signal input terminals A, B.

Regarding the working principle shown in Figure 5, it is as follows:

(A) When the power supply input current is in the current input state:

The phase locking signal output by the phase locking device 122 will be in response to the phase of the power input current, and sent to the switch control signal generating device 123 for the purpose of generating the first and second switch control signals; The output power presence sensing signal makes the input power control switch S3 in the on state, and makes the backup power control switch S4 in the off state; moreover, the capacitors C1 and C2 used by the load device 4 must always be kept at a fixed potential, so The transistor switches S1 and S2 are driven by the inductors L1 and L2 performing the charging/discharging action and in cooperation with the first and second switch control signals output from the first and second switch control signal output terminals S11 and S12, so that The inductor L1 or L2 charges the power supply energy from the power supply input current in the current input state, and outputs the charged power supply energy to the capacitors C1 and C2, so that the power supply input current can be provided to the load device 4 use;

(B) When the input current of the power supply is in the state of no current input:

The phase locking signal output by the phase locking device 122 will still maintain the original phase when the input current of the power supply is in the current input state, and send it to the switch control signal generating device 123 for continuing to generate synchronous first and second switch control signals , and at this time, the power supply presence sensing signal will make the input power control switch S3 in the closed state, and make the backup power control switch S4 in the open state, so that the inductors L1 and L2 will be able to cooperate with the transistor switches S1 and S2. Turn off the action to charge from the storage battery Vb, and output the charged power energy to the capacitors C1 and C2, so as to continuously provide a stable power supply to the load device 4 .

The relationship between the phase-locked signal and the first and second switch control signals is shown in Figure 7 (a) and (b), in which the phase-locked signal is marked with PLL, and the phase-locked signal is marked with SW1 and SW2 respectively. The first and second switch control signals; wherein, as shown in Figure 7(a), when the power supply input current is in the current input state, the signal relationship diagram between the phase lock signal and the first and second switch control signals, wherein SW1 Or when any one of SW2 is in high and low potential, the other can be a fixed high potential (as shown in case 1) or a fixed low potential (as shown in case 2); Figure 7(b) is the input current of the power supply When in the no-current input state, the signal relationship diagram between the phase lock signal and the first and second switch control signals; of course, the signal relationship diagram in Figure 7 (a), (b) is one of the preferred implementation methods of the present invention, For the detailed steps, please refer to the description of the preferred implementation method in the foregoing description of the invention. It is believed that this should further reveal the inventive spirit of the present invention.

Of course, the signal relationship shown in Figure 7(a) and (b), how it can make the capacitors C1 and C2 in the circuit shown in Figure 5 can maintain the power supply input current regardless of whether it is in the state of current input or no current input Please refer to Fig. 8(a)-(d) for the actual working condition of the fixed potential circuit, and refer to Fig. 5 and Fig. 7(a) and (b) together, so that it will be more clear.

As shown in Figure 8(a), it is the action of the first and second switches S1 and S2 when the phase lock signal is in a high potential state, and the input power control switch S3 is in the on state and the backup power control switch S4 is in the off state situation:

Since the second switch S2 will not affect the capacitor C1 or C2 no matter whether it is in the on or off state due to the relationship of the rectifier diode D2 at this time, only the first switch S1 is activated; wherein, when the first switch S1 When the first switch control signal SW1 is in a high potential state, the first switch S1 is turned on and the inductor L1 is charged, and when the first switch S1 is in a low potential state in response to the first switch control signal SW1 , the first switch S1 is in the closed state; of course, at this time, the inductor L1 is about to output the previously charged power supply energy to the capacitor C1; because, at this moment, the first switch control signal SW1 is in the high and low potential mutual conversion (as shown in FIG. 7 (a) marked A), so the first switch S1 will also be changed between on and off states, so that the potential of the capacitor C1 can always be kept at a fixed potential.

As shown in FIG. 8(b), when the phase lock signal is in a low potential state, and the input power control switch S3 is in an on state and the backup power control switch S4 is in an off state, the first and second switches S1, S2 The action situation:

Since the first switch S1 will not affect the capacitor C1 or C2 no matter whether it is in the on or off state due to the relationship of the rectifier diode D1 at this time, only the second switch S2 is activated; wherein, in response to the second The switch control signal SW2 is in the high potential state, the second switch S2 is in the open state, and the inductor L2 is charged, and when the second switch control signal SW2 is in the low potential state, the second switch S2 is in the off state, thus At this time, the inductor L2 is about to output the previously charged power supply energy to the capacitor C2; at this moment, the second switch control signal SW2 is in the high and low potentials of the mutual conversion (as shown at the mark B in Figure 7(a)), so It will cause the second switch S2 to also be switched between on and off states, so that the potential of the capacitor C2 can always be kept at a fixed potential.

As shown in Figure 8(c), when the phase lock signal is in a high potential state, and the input power control switch S3 is in an off state and the standby power control switch S4 is in an on state, the first and second switches S1 and S2 act situation:

Since the second switch control signal is always in a high potential state at this time (as shown at the mark C in Figure 7(b), the second switch S2 is always in an open state; furthermore, with the first switch control signal At this time, SW1 is in the high and low potentials, which will make the first switch S1 also be in the on and off state and change each other. In this way, when the first switch S1 is in the on state, the inductors L1 and L2 will automatically The power supply energy is charged at the storage battery Vb, and when the first switch S1 is closed, the power supply energy previously charged by the inductors L1 and L2 will also be released into the capacitor C1, so the potential of the capacitor C1 will not be at a level due to the input current of the power supply. There is no current input state and no power is available for the load device 4 .

Of course, as shown in Fig. 8(d), when the phase lock signal is in a low potential state, and the input power control switch S3 is in an off state and the standby power control switch S4 is in an on state, the first and second switches S1, S2 The action situation:

Since the first switch control signal is always in a low potential state at this time (as shown at the mark D in Figure 7(b), the first switch S1 is always in an open state; furthermore, in conjunction with the second switch control signal SW2 At this time, the high and low potentials are mutually transformed, and the second switch S2 is also in the state of mutual transformation between the on and off states. In this way, when the second switch S2 is in the on state, both the inductors L1 and L2 will automatically The power supply energy is charged at the storage battery Vb, and when the second switch S2 is closed, the power supply energy previously charged by the inductors L1 and L2 will also be released into the capacitor C2, so the potential of the capacitor C2 will not be at the same level due to the input current of the power supply. There is no current input state and no power is available for the load device 4 .

To sum up, through the present invention, an uninterruptible power supply device and method with low cost, light weight, small volume and high power conversion efficiency can be obtained.

All modifications made by those skilled in the art to the present invention do not depart from the intended protection scope of the appended claims.

Claims (32)

1. An uninterruptible power supply device, which is used to provide a load device with a stable power supply that is not affected by the presence or absence of an externally input power input current, wherein the uninterruptible power supply device includes a device that converts the input current of the AC power supply into a direct current output a rectifying device, an inverter device for converting input direct current into alternating current for use by a load device, and a backup power device for use by the load device; the load device is connected to the inverter device; It is characterized in that the uninterruptible power supply device also includes: A switch control device, in response to the input current of the power supply, generates first and second switch control signal outputs; The first and second charging/discharging devices are both connected to the rectifying device and the backup power supply device, and the first and second charging/discharging devices use the rectified power input current and the backup power supply device Output backup power supply current for charge/discharge action; The first and second potential supply devices are respectively connected to the first and second charge/discharge devices, both the first and second potential supply devices are connected to the inverter device, and the second potential supply The device is connected to the first potential supply device, and the first and second potential supply devices are used to receive the charging energy released from the first or second charging/discharging device due to the discharging action, so as to keeping the first or second potential supply device at a fixed potential at any time, and outputting the fixed potential to the inverter device for use by the load device; and The first and second switches are connected to the switch control device, and the first switch is connected to the first charge/discharge device and the first potential supply device, and the second switch is connected to the first potential supply device. A switch is connected to the second charge/discharge device and the second potential supply device, and the first and second switches are used to respond to the first and second switch control signals respectively as the first The charging/discharging paths of the first and second charging/discharging devices when performing charging/discharging operations. 2. The uninterruptible power supply device according to claim 1, wherein the ground terminal of the power supply is connected to the first and second switches, the first and second potential supply devices, the inverter device and the switch Control unit connection. 3. The uninterruptible power supply device according to claim 2, wherein the rectifying device comprises first and second rectifying diodes electrically connected in series. 4. The uninterruptible power supply device according to claim 3, wherein the rectifying device further includes an input power control switch, and the power input current is input to the first and second power supply through the input power control switch. Rectifier diodes are electrically connected to each other. 5. The uninterruptible power supply device according to claim 4, wherein the backup power supply device comprises a storage battery. 6. The uninterruptible power supply device according to claim 5, wherein the backup power supply device further includes a backup power supply charging device, which uses the power supply to input current to keep the potential of the storage battery at a fixed potential. 7. The uninterruptible power supply device according to claim 6, wherein the backup power supply device further includes a backup power control switch, the backup power supply device is connected to the switch control device, and the backup power control switch determines the Whether the backup power supply device replaces the input current of the power supply to become the power supply source of the load device. 8. The uninterruptible power supply device according to claim 7, wherein the backup power supply device further comprises a diode connected in series with the backup power control switch to protect the backup power control switch and the storage battery. 9. The uninterruptible power supply device according to claim 7, wherein the switch control device comprises: A power detection device, used to detect whether there is an input current of the power supply, and if so, generate an output power presence induction signal; The phase locking device, in response to the input current of the power supply, generates a phase locking signal having the same phase as the input current of the power supply when the input current of the power supply is in the input state, and generates a phase locking signal having the same phase as the input current of the power supply, and when the input current of the power supply is in the state of no current input , the phase locking signal output by the phase locking device still maintains the original phase; and The switch control signal generating device is connected with the power detection device and the phase locking device, and the switch control signal generating device responds to the power presence sensing signal and the phase locking signal to generate the first and second A switch control signal is used to control the first and second switches. 10. The uninterruptible power supply device according to claim 9, wherein the power presence sensing signal is used as a third switch control signal to control the input power control when the power input current is in a current input state. switch and the backup power control switch, so that they are respectively on and off, and when the input current of the power supply is in the state of no current input, control the input power control switch and the backup power control switch, so that they are respectively is off and on. 11. The uninterruptible power supply device according to claim 10, wherein the phase locking device is a phase locked loop device. 12. The uninterruptible power supply device according to claim 10, wherein the switch control signal generating device comprises: A full-wave rectifier circuit for converting the input current of the AC power supply into a DC current output; a differential amplifier circuit, used to generate a low-potential DC output in response to the potential at both ends of the storage battery; a feedback compensation circuit for outputting a lower filtered potential signal in response to the potential signals across the first and second potential supply devices; a current sensing device for generating a current sensing signal in response to the output signals of the first and second switches; A power factor correction integrated circuit, connected to the full-wave rectification circuit, the differential amplifier circuit, the feedback compensation circuit, and the current sensing circuit, to generate an output power factor correction signal; and The optical coupling driving signal output device is connected with the power factor correction integrated circuit, and the optical coupling driving signal output device generates the control signals of the first and second switches in response to the power factor correction signal. 13. The uninterruptible power supply device according to claim 12, wherein the optical coupling driving signal output device comprises at least two groups of optical coupling drivers. 14. The uninterruptible power supply device as claimed in claim 9, wherein the first and second charging/discharging devices both comprise an inductor. 15. The uninterruptible power supply device as claimed in claim 9, wherein the first and second potential supply devices both comprise a capacitor. 16. 15. The uninterruptible power supply device as claimed in claim 15, wherein said first and second potential supply means both comprise a diode for protecting said capacitor. 17. The uninterruptible power supply device as claimed in claim 9, wherein the first and second switches both comprise a transistor switch. 18. The uninterruptible power supply device according to claim 17, wherein the first and second switches are in the first or second switch state in response to the first and second switch control signals respectively. 19. The uninterruptible power supply device according to claim 18, wherein the first and second switch states are on and off states respectively. 20. The uninterruptible power supply device according to claim 19, wherein the first and second switches further include a current sensing device, and the current sensing device changes the amount of current flowing through the transistor switch to reflect to its secondary side circuit, so that the secondary side circuit outputs the current sensing signal for use by the power factor correction integrated circuit. twenty one. An uninterruptible power supply method, used in an uninterruptible power supply device, to provide a load device with a stable power supply that is not affected by the presence or absence of an externally input power input current, the uninterruptible power supply device includes a switch control device and a first One and the second potential supply device, wherein the switch control device generates a phase lock signal and a first and a second switch control signal output in response to the input current of the power supply, wherein the method includes the following steps: a) When the input current of the power supply is in the current input state and the phase locking signal is in the first working state, the first switch control signal is in the first and second control states and alternates periodically with each other, and the The second switch control signal is in one of the first or second control states, so that the first potential supply device provides a stable power supply for use by the load device; b) When the input current of the power supply is in a current input state and the phase locking signal is in a second working state, the first switch control signal is in one of the first or second control states, and the first switch control signal is in one of the first or second control states, and the first The two switch control signals change alternately and periodically in the first and second control states, so that the second potential supply device provides a stable power supply for use by the load device; c) when the input current of the power supply is in the no-current input state and the phase locking signal is in the first working state, the first switch control signal is in the first or second control state and alternates periodically with each other, and The second switch control signal is in the first control state, so that the first potential supply device continuously provides stable power for use by the load device; and d) When the power supply input current is in the no-current input state and the phase lock signal is in the second working state, the first switch control signal is in the first control state, and the second switch The control signal changes alternately and periodically in the first and second control states, so that the second potential supply device can continuously provide stable power for use by the load device. twenty two. The uninterruptible power supply method according to claim 21, wherein the uninterruptible power supply device further comprises: A rectifying device, used to rectify the input current of the AC power supply into a DC current; The inverter device is used to convert the input direct current into an alternating current output to supply the load device; A backup power supply device, configured to output a backup power supply current for use by the load device; The first and second charging/discharging devices use the power input current and the standby power current to perform charging/discharging operations; and The first and second switches are used to respond to the first and second switch control signals respectively, and serve as the charging/discharging path when the first and second charging/discharging devices perform the charging/discharging operation; Wherein carrying out the described step (a) of above-mentioned method also comprises the following steps before: a1) Detect the input current of the power supply, when the input current of the power supply is in the state of current input, the switch control device makes the backup power supply device in the disconnected state, and when the input current of the power supply is in the state of no current input , so that the standby power supply device is in a supply state. twenty three. The uninterruptible power supply method according to claim 21, characterized in that, in response to the first switch control signal being in the first and second control states, the first switch is in the first and second switch states respectively state, in response to the second switch control signal being in the first and second control states, the second switch is in the first and second switching states, respectively. twenty four. The method for supplying an uninterruptible power supply according to claim 23, wherein the first and second switch states are on and off states respectively. 25． The method for supplying uninterruptible power supply according to claim 25, characterized in that, when the first switch is in the open state in the step (a), the input of the first charging/discharging device is rectified The power supply inputs current to perform the charging operation, and when the first switch is in the closed state, the first charging/discharging device performs the discharging operation, so as to charge from the power supply input current Charging energy is provided to the first potential supply device to keep the first potential supply device at a fixed potential for use by the load device. 26． The method for supplying uninterruptible power supply according to claim 24, characterized in that, when the second switch is in the open state in the step (b), the input of the second charging/discharging device is rectified The power supply inputs current to perform the charging operation, and when the second switch is in the closed state, the second charging/discharging device performs the discharging operation to charge the charged current from the power supply input current. The charging energy provided to the second potential supply device keeps the second potential supply device at a fixed potential for use by the load device. 27． The method for supplying uninterruptible power supply according to claim 24, characterized in that, when both the first and second switches are in the open state in the step (c), the first and second charging/ The discharging device inputs the backup power supply current to perform the charging operation, when the first switch is in the closed state and the second switch is still in the open state, the first and second charging/discharging devices performing the discharge operation to provide the charging energy charged from the standby power supply current to the first potential supply device, so that the first potential supply device can continuously maintain a fixed potential for the load device use. 28． The method for supplying uninterruptible power supply according to claim 24, wherein in said step (d), when said first and second switches are in said open state, said first and second charging/ The discharge device inputs the backup power supply current to perform the charging operation, when the second switch is in the off state and the first switch is still in the on state, the first and second charge/discharge devices performing the discharge operation to provide the charging energy charged from the backup power supply device to the second potential supply device, so that the second potential supply device can continuously maintain a fixed potential for use by the load device . 29． The method for supplying an uninterruptible power supply according to claim 21, wherein the first and second working states are respectively a high potential state and a low potential state. 30． The method for supplying an uninterruptible power supply according to claim 21, wherein the first and second working states are a low potential state and a high potential state respectively. 31． The method for supplying an uninterruptible power supply according to claim 21, wherein the first and second control states are respectively a high potential state and a low potential state. 32． The method for supplying an uninterruptible power supply as claimed in claim 21, wherein the first and second control states are respectively a low potential state and a high potential state.

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