TWI655819B - Control method for a switching power supply apparatus - Google Patents

Abstract

A control method for a switching power supply device, the control method comprising: controlling a switching power supply device by using a pulse modulation signal; measuring an output signal of the switching power supply device; and outputting the output signal and a comparison signal A modulation gain is multiplied and divided to generate a reference input signal; a duty cycle of the pulse modulation signal is adjusted according to the reference input signal.

Description

Control method of switching power supply device

The present invention relates to a control method of a switching power supply apparatus, and more particularly to a control method for controlling according to an output signal of a switching power supply unit.

With the advancement of technology, most of the current equipment and facilities need electricity. Some of these special equipment or facilities often require power supplies of the appropriate specifications. For example, a data center requires a lot of power. Therefore, in order to save energy, today's data centers often adopt an architecture design that directly uses energy from a high-voltage electric tower to avoid increasing losses through layer-level energy conversion.

In the field of power conversion of high-voltage power supplies, the input series output parallel (ISOP) architecture is currently used for powering multiple power supplies together. However, when the input signal or output signal of one of the power supplies in the architecture is offset, it often affects the output signals of other power supplies, causing the overall system output to be out of alignment, and may even cause subsequent device damage. Or cause danger.

The present invention provides a control method of a switching power supply device to keep the output of the power supply supply stable.

The invention discloses a control method of a switching power supply device. The control method has: controlling a switching power supply device by using a pulse modulation signal; measuring an output signal of the switching power supply device; and outputting the output signal, A comparison signal is multiplied and divided by a modulation gain to generate a reference input signal; and a duty cycle of the pulse modulation signal is adjusted according to the reference input signal.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to FIG. 1. FIG. 1 is a flow chart of a method for controlling a switching power supply device according to an embodiment of the invention. In step S101, a switching power supply device is controlled by a pulse modulation signal. In step S103, an output signal of the switched mode power supply device is measured. In step S105, the output signal, a comparison signal and a modulation gain are multiplied and divided to generate a reference input signal. In step S107, a duty cycle of the pulse modulation signal is adjusted according to the reference input signal.

Referring to FIG. 2, FIG. 2 is a functional block diagram of a switching power supply device according to an embodiment of the invention. The switching power supply device 10 multiplies and outputs the output signal Vo, the comparison signal Vcom and the modulation gain to generate the reference input signal Vinc according to the control method of FIG. 1. The switching power supply device 10 does not need to measure the input signal Vi, and the switching power supply device 10 The output signal Vo is generated according to the reference input signal Vinc and the comparison signal Vcom. The comparison signal Vcom is associated with the output signal Vo. The switching power supply unit 10 compares the comparison signal Vcom with a continuous triangular wave to generate one or more pulse modulation signals, for example. The pulse modulation signal is used to control a plurality of switches in the switching power supply device 10. Details of generating a pulse modulation signal and controlling the switching power supply device with a pulse modulation signal are not described herein.

Referring to FIG. 3, a more detailed description of the control method of the switching power supply device is shown. FIG. 3 is a partial flow chart of a method for controlling the switching power supply device according to an embodiment of the invention. In step S201, the reference input signal Vinc is linearly converted to generate a reference output signal Voc. In step S203, the difference between the reference output signal Voc and the output signal Vo is compensated to adjust the comparison signal Vcom. In step S205, the comparison signal Vcom is multiplied with a modulation gain to generate a duty ratio of the pulse modulation signal.

4A and 4B, FIG. 4A is a functional block diagram of some components of a switched power supply device according to another embodiment of the present invention, and FIG. 4B is a schematic diagram of another embodiment of the present invention. A functional block diagram of some of the components of the switched power supply unit. As shown in FIG. 4A, the output signal Vo and the comparison signal Vcom are divided to obtain a result of dividing the signal value of the output signal Vo by the signal value of the comparison signal Vcom. The result of this division is then multiplied by the inverse of the modulation gain to form the reference input signal Vinc. In an embodiment, the switching power supply device 10 has, for example, a transformer, and when calculating the reference input signal, the turns ratio of the transformer needs to be calculated together, that is, the output signal, the comparison signal, the modulation gain, and The transformer turns ratio is divided to generate a reference input signal.

The linear conversion of the reference input signal Vinc is, for example, multiplied by a reference to the reference input signal Vinc, and then multiplied by the reference input signal Vinc with a bias value. From one perspective, the reference input signal Vinc is, for example, a reference signal that is converted by the output signal to approximate the ideal input signal. Through the aforementioned linear conversion, the reference input signal Vinc is converted into the reference output signal Voc. From another point of view, the reference output signal Voc can be said to be an ideal output signal converted from the reference input signal Vinc. Therefore, by comparing the reference output signal Voc with the output signal Vo, the comparison result is compensated to form the comparison signal Vcom, and the duty ratio of the pulse modulation signal can be adjusted or generated.

5 is a functional block diagram of a switching power supply device according to an embodiment of the invention. As shown in FIG. 5, the switching power supply device 10 does not need to measure the input signal Vi, and the switching power supply device 10 generates the output signal Vo according to the reference input signal Vinc and the comparison signal Vcom. The output signal Vo forms a reference input signal Vinc via a division operation and a modulation gain as described above, and the reference input signal Vinc is further linearly converted to form a reference output signal Voc. As described above, the reference input signal Vinc is an ideal input signal, and the reference input signal Vinc is linearly converted to obtain an ideal output signal Voc (reference output signal) for comparison with the actual output signal Vo. In practice, the product of the modulation gain and the comparison signal Vcom is a function of the current duty cycle of the switching power supply unit 10. In other words, the user can adjust the steps according to the physical meaning of these system parameters according to actual needs at the system level or the circuit layer. The system parameters are, for example, the aforementioned modulation gain, the turns ratio or the current (to be adjusted) comparison signal Vcom.

In this embodiment, the difference between the reference output signal Voc and the output signal Vo is compensated and is the aforementioned comparison signal Vcom. The comparison signal Vcom at this time is supplied to the switching power supply unit 10 for correlation control, and at this time, the comparison signal Vcom is used to perform the next division operation. The compensation is processed by, for example, the difference between the reference output signal Voc and the output signal Vo by the filter, and the compensation is not limited herein.

This embodiment will be described with reference to FIG. 5. It should be noted that, in practice, the related steps of division, modulation gain, linear conversion and compensation may be implemented inside or outside the switching power supply device 10. In other words, in practice, the method steps described above can be performed by the switched power supply unit 10, or the method steps described above can be performed by a related device circuit external to the switched power supply unit. The above is merely an example and is not limited to this.

Further, the present invention provides another control method of a switching power supply device for controlling a plurality of switching power supply devices employing an input series output parallel architecture. Please refer to FIG. 6. FIG. 6 is a functional block diagram of an input serial output parallel architecture according to an embodiment of the invention. Based on the architecture of FIG. 6 , for the sake of clarity, the description will be made by voltage signals. However, those skilled in the art can understand after reading the specification. After appropriate adjustment, each signal can also be a current signal. .

As shown in FIG. 6, each input terminal of the switching power supply devices 10_1~10_N is used to receive input partial voltages Vi1~ViN, respectively. In this embodiment, the input voltage divisions Vi1 to ViN are voltage signals, and the input voltage divisions Vi1 to ViN are divided by the input voltage Vin. However, in practice, the initial input voltage Vin can also be a current signal, which is not limited herein. The switching power supply devices 10_1~10_N generate a plurality of output signals according to the input partial voltages Vi1 to ViN, respectively. These output signals are provided to the load RL. In Figure 6, the load RL is simplified to an equivalent resistance to make the description simple and straightforward, but does not really mean that the load can only be a resistor. Each output signal has its own voltage Vo1~VoN and current Io1~IoN. In one embodiment, ideally, the voltages Vo1 to VoN are equal to each other.

Please refer to FIG. 7 to illustrate how to control a plurality of switched power supply devices in which the input serial output is connected in parallel. FIG. 7 is a flowchart of a method for controlling a switching power supply device according to still another embodiment of the present invention. In step S301, the input ends of the plurality of switching power supply devices are connected in series and the output terminals are connected in parallel. In step S303, each of the switching power supply devices is controlled by a pulse modulation signal. In step S305, an output signal of each switched power supply device is measured. In step S307, the output signal of each switched power supply device is multiplied and divided by a comparison signal and a modulation gain to generate a reference input signal of each switched power supply device. In step S309, the pulse modulation signal of each switching power supply device is adjusted according to the reference input signal of each switching power supply device.

Since the output terminals of the switching power supply devices 10_1 to 10_N are connected in parallel with each other, the voltages Vo1 to VoN are ideally the same as the load voltage VL. Therefore, in an embodiment, the method generates a reference input signal (such as the reference input signal Vinc as described above) according to the load voltage VL as described above, and controls each of the switched power supply devices 10_1 according to the reference input signal as described above. ~10_N. The relevant control details are as described above, and those skilled in the art can derive from the foregoing description how to control the respective switching power supply devices 10_1~10_N according to the reference input signals, and details are not described herein again. In this embodiment, since the switching power supply devices 10_1 to 10_N can be controlled by performing one operation with the load voltage VL, the output offset of the switching power supply devices 10_1 to 10_N can be avoided with a small amount of additional calculation amount. .

However, in practice, even if the output terminals of the switching power supply devices 10_1 to 10_N are connected in parallel with each other, there is a possibility that there is a slight deviation between the voltages Vo1 to VoN of the respective output signals based on actual physical conditions. Therefore, in another embodiment, the method detects the voltages Vo1~VoN and generates different reference input signals according to the voltages Vo1~VoN, and then controls the switching power supply device 10_1 according to the different reference input signals. 10_N. Therefore, it is possible to reliably control the switching power supply devices 10_1~10_N according to the actual output signals of the switching power supply devices 10_1~10_N, thereby realizing more accurate feedback control, and indeed avoiding the switching power supply device 10_1~ 10_N output offset.

In summary, the present invention provides a control method for a switched power supply device, wherein the control method of the switched power supply device controls the switched power supply device according to an output signal of the switched power supply device. In addition to avoiding the output offset of the switching power supply unit, the information about the output signal of the switching power supply unit is relatively easy to obtain, so that it is possible to avoid adding additional sensors to the switching power supply unit. Moreover, the measurement signal must have some error, and the output signal is controlled to further avoid the misalignment caused by using multiple measurement signals.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

10, 10_1~10_N‧‧‧Switching power supply unit

Io1~IoN‧‧‧ Current

Vcom‧‧‧ comparison signal

Vi‧‧‧ input signal

Vi1~ViN‧‧‧ input partial pressure

Vin‧‧‧Input voltage

Vinc‧‧‧ reference input signal

VL‧‧‧ load signal

Vo‧‧‧ output signal

Vo1~VoN‧‧‧ voltage

Voc‧‧‧ reference output signal

FIG. 1 is a flow chart of a method for controlling a switching power supply device according to an embodiment of the invention. FIG. 2 is a functional block diagram of a switched power supply device according to an embodiment of the invention. FIG. 3 is a partial flow chart of a method for controlling a switching power supply device according to an embodiment of the invention. 4A is a functional block diagram of some components of a switched power supply device according to another embodiment of the present invention. 4B is a functional block diagram of some components of a switched power supply device according to another embodiment of the present invention. FIG. 5 is a functional block diagram of a switching power supply device according to an embodiment of the invention. FIG. 6 is a functional block diagram of an input serial output parallel architecture according to an embodiment of the invention. FIG. 7 is a flowchart of a method for controlling a switching power supply device according to still another embodiment of the present invention.

Claims (10)

A method for controlling a switching power supply device, the method comprising: controlling a switching power supply device by using a pulse modulation signal; measuring an output signal of the switching power supply device; dividing the output signal by a comparison signal; The output signal is divided by the comparison signal and then multiplied by a modulation gain to generate a reference input signal; and the pulse modulation signal is adjusted according to the reference input signal. The control method of claim 1, wherein the step of adjusting the pulse-modulation signal according to the reference input signal comprises: linearly converting the reference input signal to generate a reference output signal; compensating the reference output signal and the The difference of the output signal is used to adjust the comparison signal; and the comparison signal is multiplied and divided by the modulation gain to generate a duty cycle of the pulse modulation signal. The control method of claim 2, wherein the step of linearly converting the reference input signal to generate the reference output signal comprises multiplying the reference input signal by a multiple rate and adding an offset value to form the reference output Signal. The control method of claim 2, wherein the step of compensating the difference between the reference output signal and the output signal to adjust the comparison signal comprises: generating a difference between the reference output signal and the output signal by using a filter The comparison signal. The control method of claim 1, wherein the switching power supply device comprises a transformer, and the output signal, the comparison signal and the modulation gain are multiplied and divided to generate the parameter. The test input signal includes multiplying and dividing the output signal, the comparison signal, and the modulation gain into a ratio of turns of the transformer to generate the reference input signal. A control method of a switching power supply device, comprising: connecting input ends of a plurality of switched power supply devices in series and outputting in parallel; each switched power supply device is controlled by a pulse modulation signal; measuring each switching An output signal of the power supply device; dividing the output signal of each switched power supply device by a comparison signal; and dividing the input signal by the comparison signal, then multiplying by a modulation gain to generate a reference input signal of each switched power supply device; adjusting the pulse modulation signal of each switched power supply device according to the reference input signal of each switched power supply device. The control method of claim 6, wherein the step of adjusting the pulse-modulation signal of each switched-mode power supply device according to the reference input signal of each switched-mode power supply device comprises: each switching power supply device Linearly converting the reference input signal to generate a reference output signal of each switched power supply device; compensating for a difference between the reference output signal of each switched power supply device and the output signal to generate the switched power supply device And comparing the comparison signal of each switched power supply device with the modulation gain to generate a duty cycle of the pulse modulation signal of each switched power supply device. The control method of claim 7, wherein the step of linearly converting the reference input signal of each switched power supply device to generate the reference output signal of each switched power supply device comprises: The reference input signal is multiplied by a multiple rate plus an offset value to form the reference output signal of each switched power supply device. The control method of claim 7, wherein the step of compensating the difference between the reference output signal of each switched power supply device and the output signal to adjust the comparison signal of each switched power supply device comprises: The difference between the reference output signal of the switching power supply device and the output signal is generated by a filter to generate the comparison signal of each switching power supply device. The control method of claim 6, wherein each switching power supply device comprises a transformer, and the output signal of each switched power supply device, the comparison signal and the modulation gain are multiplied and divided to generate each switching power supply. The reference input signal of the device includes multiplying and dividing the output signal of the switched power supply device, the comparison signal, the modulation gain, and the turns ratio of the transformer to generate the reference input signal of each switched power supply device.