TWI408866B - Uninterruptible power supply system and method - Google Patents

Abstract

Uninterruptible power supply system and method are disclosed. The system includes a switching power converter, an auxiliary power supply module, and at least one power supply circuit. The auxiliary power supply module includes a coupling inductor and a power storage. The coupling inductor is coupled with the inductor of the switching power converter unit, in order to receive electrical power and send the electrical power to the power storage. When the main power source stopped providing power to an electrical device, the power storage can send backup power to the electrical device.

Description

Power supply system and method for preventing power interruption

A power supply system and method, and more particularly to a power supply system and method capable of preventing power supply interruption.

An electric power supply technology that prevents power interruption, or an uninterruptible power supply (UPS), is used to provide backup power to an electronic device when the original main power supply is abnormal (such as power interruption or instability). Technology that enables electronic devices to function as usual, applied to many electronic products, such as computers, mobile phones, and even precision instruments.

As shown in the first figure, a schematic diagram of a conventional power supply system is applied to an electronic device including a main power source 11, a switching power converter 12, a power storage unit 13, a boost circuit 14, and an auxiliary voltage regulating unit. 151 and supply voltage regulating units 152 and 153, wherein the switching power converter 12 includes a storage inductor 121.

The power Vi supplied from the main power source 11 is transmitted to the switching power converter 12 and the power supply voltage adjusting units 152 and 153 for voltage transformation to be used for each module in the electronic device. In this example, the power supply voltage adjusting unit The outputs generated by 152 and 153 are provided for use in internal modules of electronic devices (such as some functional chips, etc.), generally speaking, the voltage is relatively low and fixed, and because the voltages required by the modules in the electronic device are different, At least one supply voltage adjusting unit 152, 153 is required to provide voltages of different levels; in addition, the output voltage Vo generated by the switching power converter 12 is supplied to a higher output and can be adjusted according to the load. Variable module.

The booster circuit 14 is configured to boost the power provided by the main power source 11 and transmit it to the power storage unit 13 for storage. When the power supply of the main power source 11 is interrupted or unstable, the power stored in the power storage unit 13 can be transformed by the auxiliary voltage adjusting unit 151, and then supplied to the power supply voltage adjusting units 152 and 153 and the switched power conversion. Device 12, so that the source of power is not interrupted.

The booster circuit 14 usually uses a capacitor, a diode type voltage doubler circuit or a boosting type switching regulator (switching boost regulator), and these circuits will make the original circuit structure too large and also cost. rise.

In view of the above, the technical problem to be solved by the present invention is to provide a power supply system and method for preventing interruption of power supply, which is used for extracting standby power in a manner that does not separately provide a boosting circuit to reduce the line of the power supply system. Volume and setup costs.

In order to achieve the above object, according to an aspect of the present invention, a power supply system for preventing power interruption is provided, which receives power of a main power source and supplies it to an electronic device, and the system includes a switching power converter and an auxiliary power supply. The module and at least one power supply line.

The switching power converter is coupled to the main power source, and may be a boost, buck or buck-boost power converter to transform the power provided by the main power source, and the switching power converter has a storage The auxiliary power supply module is coupled to the main power supply and the switching power supply converter to prevent power interruption, and includes at least one power storage unit and a coupled inductor.

The coupled inductor is coupled to the power storage unit and the energy storage inductor to transmit power from the power storage unit to the power storage unit for storage; the power storage unit is coupled to the coupled inductor, and may be a capacitor or a rechargeable battery for use in the main When the power supply is normal, the power is received from the coupled inductor for storage, and when the main power supply is abnormal, the stored power is transmitted to the power supply line and the switching power converter for use.

In addition, the auxiliary power supply module further includes an auxiliary voltage adjusting unit coupled to the power storage unit for transforming the power stored by the power storage unit, and storing the power storage unit when the main power supply is abnormal. Power is supplied to the power supply line as well as the switched power converter. The auxiliary voltage regulating unit has a single-conducting unit for preventing power from flowing backward from the auxiliary voltage regulating unit to the power storage unit when the main power supply is normal, and enabling the power of the power storage unit when the main power supply is abnormal Flow to the power supply unit and the power supply lines.

The power supply lines of the power supply system are coupled to the main power supply and the auxiliary power supply module for supplying power transmitted by the main power supply or the auxiliary power supply module to the electronic device for operation. Each of the power supply lines includes a power supply voltage adjusting unit for transforming the power transmitted by the main power source or the auxiliary power supply module.

According to another aspect of the present invention, a power supply method for preventing power interruption is provided, which is applied to a power supply system to provide power to an electronic device, the power supply system including a main power source, a switching power converter, and at least one A power supply line, wherein the main power supply provides power to the power supply line and the switched power converter, and the steps include: providing a coupled inductor coupled to the energy storage inductor of the switched power converter; and utilizing the coupled inductor when the main power supply is normal The power is drawn from the energy storage inductor of the switched power converter and transmitted to a power storage unit for storage of the backup power. In addition, when the main power supply of the power supply system is interrupted, power is supplied to the power supply line and the switching power converter through the power storage unit.

When the main power source is normal, power is stored by winding a coupled inductor in the energy storage inductor of the original switching power converter, so that spare power can be supplied to the electronic device when the main power source is abnormal. There is no need to additionally set up a boost circuit to draw backup power, saving setup costs and reducing line size.

The above summary and the following examples are intended to be illustrative of the invention and the embodiments of the invention.

Referring to the second figure, the power supply system for preventing power interruption in the present invention is applied to power supply of an electronic device, including a main power source 21, a switching power converter 22, an auxiliary power supply module 30, and at least one power supply line. 40a and 40b.

The main power source 21 is used to supply power required for the operation of an electronic device (not shown). The switching power converter 22 is coupled to the main power source 21, and may be a boost, buck or buck-boost power converter. The voltage Vi generated by the main power source 21 is modulated to generate an output voltage Vo and transmitted to an electronic device for use.

The auxiliary power supply module 30 is coupled to the switching power converter 22 and the main power source 21 for drawing power for storage when the main power source 21 is normally powered, and providing standby power when the main power source 21 is powered off or abnormal. To allow the electronic device to function properly.

The auxiliary power supply module 30 includes a coupled inductor 24, a power storage unit 23, and an auxiliary voltage adjusting unit 25. The coupling inductor 24 is coupled to a storage inductor 221 of the switching power converter 22 for drawing standby power when the main power source 21 is powered normally, and transmits it to the power storage unit 23 for storage. It is worth mentioning that, by designing the ratio of the storage inductor 221 to the number of turns of the coupled inductor 24, the voltage drawn by the coupled inductor 24 can be adjusted to meet the power storage requirements of the power storage unit 23. Alternatively, the energy storage inductor 221 and the coupled inductor 24 can be a primary side coil and a secondary side coil of a coupling transformer, respectively. Similarly, the coupling inductance 24 can be determined from the design of the turns ratio between the two. The voltage of the power drawn by the switching power converter 22 is high or low.

The power storage unit 23 is coupled to the coupled inductor 24, which may be a capacitor or a rechargeable battery. The stored backup power can be supplied to the electronic device for use when the main power source 21 is abnormal. The auxiliary voltage adjusting unit 25 modulates the voltage when the power of the power storage unit 23 is needed, and includes a one-way conducting unit (not shown), which may be a diode, because usually When the main power source 21 is normally powered, the voltage supplied by the main power source 21 is greater than the voltage stored in the power storage unit 23, so that the power can be prevented from being reversely transmitted from the auxiliary voltage regulating unit 25 to the power storage unit 23 through the one-way conduction unit, and When the power supply of the main power source 21 is abnormal or interrupted, the voltage of the power storage unit 23 is greater than the voltage provided by the main power source 21, and the power of the power storage unit 23 can be transmitted to the switching power converter 22 at this time. And power supply lines 40a and 40b. In this way, through the one-way communication unit, the system does not need to provide an additional detection module to detect the normality of the main power supply 21, and the auxiliary power supply module 30 can also store power when the main power supply is normal 21. And when the main power supply 21 is abnormal, the power supply is achieved, so as to simplify the circuit structure.

For example, the electronic device may be a portable electronic product (such as a mobile phone), and the main power source 21 is a battery mounted on the electronic product, when the user accidentally drops the electronic product or is impacted. The main power source 21 is likely to fall off. At this time, the power storage unit 23 of the auxiliary power supply module 30 can automatically supply the stored backup power to the electronic product through the auxiliary voltage adjusting unit 25 for use, so that the user can continue to use. Electronic products, or to avoid loss of data in electronic products.

In addition, the power supply lines 40a and 40b included in the power supply system are configured to receive the power provided by the main power source 21 and output to the electronic device for operation, and include a power supply voltage adjusting unit 25a and 25b for adjusting the main power source 21. The transmitted voltage, and because the voltage required by each module in the electronic device is different, generally there are a plurality of power supply lines 40a, 40b to generate voltages of different levels to meet the requirements of different modules.

In this embodiment, the output generated by the power supply lines 40a and 40b is provided to an internal module of the electronic device (such as some functional chips, etc.), and generally the voltage is relatively low and fixed; and the switching power converter 22 The generated output voltage Vo is a module that is supplied to an electronic device that requires a higher output and needs to be voltage-modulated depending on the load. In addition, the power supply lines 40a, 40b may also have a power management module (PMIC) to switch the power supply mode according to the requirements of the respective power modules, such as a normal power mode or a power saving mode.

Referring to FIG. 3A, it is a schematic diagram of an embodiment of a switched power converter 22a. The boost converter power converter includes a storage inductor 221a, a switch unit Qa, a diode Da, and a capacitor. Ca, through the on and off of the switching unit Qa, allows the input voltage Vi to be converted into an output voltage Vo for output. The coupled inductor 24 shown in the second figure is coupled to the energy storage inductor 221a to draw power for transmission to the power storage unit 23 for storage. The switching power converter 22b and the step-up and step switching power converter 22c shown in the third B and third C diagrams respectively have the energy storage inductors 221b and 221c and the switching unit Qb. And Qc, diodes Db and Dc, and capacitors Cb and Cc, the coupled inductor 24 is coupled to the energy storage inductors 221b and 221c to draw power.

Referring to the fourth figure, an operation diagram of an embodiment of a power supply system for preventing power interruption is provided. When the power supply of the main power source 21 is normal, power is transmitted to the switching power converter 22 and the power supply lines 40a and 40b. The supply voltage adjusting units 25a and 25b and the switching power converter 22 in the power supply lines 40a and 40b convert the received power to generate voltages of various levels and supply them to the respective units and modules that require power. Group use. At this time, the coupled inductor 24 draws power from the energy storage inductor 221 of the switched power converter 22 to the power storage unit 23 for storage, in case of need.

Then, referring to the fifth figure, an operation diagram of an embodiment of the power supply system for preventing power interruption is provided. When the main power source 21 interrupts the power supply or the power supply is unstable, the power storage unit 23 transmits the auxiliary voltage adjusting unit 25. Power is supplied to the switching power converter 22 and the power supply lines 40a and 40b so that the supply of power is not interrupted, and the stability of use of the electronic device is improved.

Referring to FIG. 6 , a flowchart of an embodiment of a power supply method for preventing power interruption is provided. Referring to FIG. 2 , the method includes: providing a coupled inductor 24 coupled to the switched power converter 22 . The energy storage inductor 221 (S601), and when the main power source 21 is powered normally, the coupled inductor 24 is used to draw power from the energy storage inductor 221 of the switching power converter 22 to a power storage unit 23 for storage of backup power. (S603), when the power supply of the main power source 21 of the power supply system is interrupted, the power storage unit 23 can supply power to the power supply lines 40a and 40b and the switching power converter 22 (S605), so that the power source of the electronic device does not Interrupted.

By winding a coupled inductor at the energy storage inductance of the original switching power converter, power is transmitted to the power storage unit, so that the electronic device can have an alternate power source when the main power source is abnormal, so as to enhance the use. The stability of the upper part, and the power drawn by the coupled inductor, does not require an additional boost circuit for power capture, thus reducing the line size and manufacturing cost.

The above description of the embodiments of the present invention and the drawings are intended to be within the scope of the following claims, and any one skilled in the art of the present invention can easily Any changes or modifications may be covered by the patents defined in this case.

11. . . main power

12. . . Switching power converter

121. . . Energy storage inductor

13. . . Power storage unit

14. . . Boost circuit

151. . . Auxiliary voltage regulator

152, 153. . . Supply voltage regulation unit

twenty one. . . main power

22, 22a, 22b, 22c. . . Switching power converter

221, 221a, 221b, 221c. . . Energy storage inductor

twenty three. . . Power storage unit

twenty four. . . Coupled inductor

25. . . Auxiliary voltage regulator

25a, 25b. . . Supply voltage regulation unit

30. . . Auxiliary power supply module

40a, 40b. . . power supply circuit

S601～S605. . . Flow chart step description

The first picture shows the circuit architecture of the conventional power supply system;

The second figure is a circuit architecture diagram of an embodiment of a power supply system for preventing power interruption in the present invention;

Figure 3A is a circuit diagram of an embodiment of a boost power converter;

Figure 3B is a circuit diagram of an embodiment of a buck power converter;

Figure 3C is a circuit diagram of an embodiment of a buck-boost power converter;

The fourth figure is a schematic diagram of the operation of an embodiment of the power supply system for preventing power interruption in the present invention;

Figure 5 is a schematic view showing the operation of an embodiment of the power supply system for preventing power interruption in the present invention;

The sixth figure is a flow chart of an embodiment of a power supply method for preventing power interruption in the present invention.

twenty one. . . main power

twenty two. . . Switching power converter

221. . . Energy storage inductor

twenty three. . . Power storage unit

twenty four. . . Coupled inductor

25. . . Auxiliary voltage regulator

25a, 25b. . . Supply voltage regulation unit

30. . . Auxiliary power supply module

40a, 40b. . . power supply circuit

Claims (10)

A power supply system for preventing power interruption is to receive power from a main power source and supply it to an electronic device, comprising: a switching power converter coupled to the main power source, and the power provided by the main power source is The switching power converter includes a storage inductor; an auxiliary power supply module for preventing power interruption, coupled to the main power source and the switching power converter, comprising: a coupled inductor coupled to the switching The energy storage inductor of the power converter is configured to draw power; at least one power storage unit coupled to the coupled inductor to store power transmitted from the coupled inductor; and at least one power supply line coupled to The main power source and the auxiliary power supply module provide power to the electronic device for use by the main power source or the auxiliary power supply module. The power supply system for preventing power interruption as described in claim 1, wherein the auxiliary power supply module further includes: an auxiliary voltage adjustment unit coupled to the power storage unit, the power supply lines, and the switching power supply The converter is configured to convert the power stored by the power storage unit, and supply the power stored by the power storage unit to the power supply lines and the switching power converter when the main power supply is abnormal. The power supply system for preventing power interruption as described in claim 2, wherein the auxiliary voltage adjustment unit comprises: a one-way communication unit for preventing power from being transmitted from the main power source to the power storage device through the auxiliary voltage regulation unit And a unit capable of transmitting power of the power storage unit to the power supply lines and the switching power converter when the main power supply is abnormal. The power supply system for preventing power interruption as described in claim 3, wherein the one-way communication unit is a diode. The power supply system for preventing power interruption according to claim 1, wherein a ratio of the coupled inductor to the energy storage inductance determines a voltage that the coupled inductor draws from the switched power converter. High and low. The power supply system for preventing power interruption as described in claim 1, wherein the power storage unit is a capacitor or a rechargeable battery. The power supply system for preventing power interruption as described in claim 1, wherein the power supply line includes: a power supply voltage adjusting unit that converts power transmitted by the main power source or the auxiliary power supply module . A power supply method for preventing power interruption is applied to a power supply system for providing power to an electronic device, the power supply system including a main power supply, a switching power converter, and at least one power supply line, wherein the main power supply system Providing power to the power supply lines and the switched power converter includes: providing a coupled inductor coupled to a stored energy inductor of the switched power converter; utilizing the coupled inductor, the slave power converter The energy storage inductor draws power and transmits it to a power storage unit for storage of backup power; and the power supply lines and the switching power converter are based on the power supply status of the main power source, and the main power source and the power storage unit A source of electricity. The power supply method for preventing power interruption as described in claim 8, wherein the power supply line and the switching power supply source obtain a power source from the main power source when the main power supply is normal. The power supply method for preventing power interruption as described in claim 8 of the patent application, further comprising: when the main power supply is interrupted, the power supply lines and the power conversion module obtain a power source from the power storage unit.