WO2012152160A1

WO2012152160A1 - Digital power supply and circuit board

Info

Publication number: WO2012152160A1
Application number: PCT/CN2012/073667
Authority: WO
Inventors: 殷俊琳
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-27
Filing date: 2012-04-09
Publication date: 2012-11-15
Also published as: CN202306199U

Abstract

A digital power supply (1) and a circuit board thereof. The digital power supply (10) comprises: a pulse-width modulation (PWM) control unit (12) and one or multiple driver units (14). The driver unit (14) and the PWM control unit (14) are connected. The PWM control unit (12) is applicable in processing a signal inputted, and in outputting to the driver unit (14) a digital signal acquired after processing. The driver unit (14) is applicable in driving a field-effect transistor on the basis of the digital signal processed by the PWM control unit (12). The digital power supply has a compact size and reduced costs, and allows for lowered barrier to use.

Description

TECHNICAL FIELD The present invention relates to the field of power supply control, and in particular to a digital power supply and a circuit board. BACKGROUND At present, power supply technologies are mostly implemented by analog signal control technologies. The advantages of analog signal control are: simple circuit, stable output, low cost, and disadvantages: no flexible control, low efficiency. The digital power supply has the advantages of online programmability, high operation precision, stable reliability, high processing efficiency, etc., but the current implementation cost is high, and corresponding PCB layout and wiring of the digital power supply are required for different applications. The cost of digital power is high, and the use of high thresholds. SUMMARY OF THE INVENTION The embodiments of the present invention provide a digital power supply and a circuit board to solve the problems of high cost of the digital power supply in the prior art and high use threshold. According to an aspect of an embodiment of the present invention, a digital power supply is provided, the digital power supply comprising: a pulse width modulation PWM control unit, and one or more driving units, wherein the driving unit is connected to the PWM control unit, The PWM control unit is configured to process the input signal, and output the digital signal obtained after the processing to the driving unit; the driving unit is configured to be a digital signal processed according to the PWM control unit Drive the field effect transistor. Preferably, the PWM control unit comprises: an analog to digital converter configured to convert the sampled output analog voltage signal into a digital signal; a memory configured to store an algorithm; and an interface configured to provide an external device to be connected to the digital power source And the interface is further configured to receive an edit performed on an algorithm stored by the memory; the controller is configured to process the digital signal according to an algorithm in the memory. Preferably, the driving unit comprises: a metal oxide semiconductor field effect transistor MOSFET driver. Preferably, the MOSFET driver is configured to provide one or more voltage outputs, and the one or more voltage outputs can be pre-configured. Preferably, the interface is a power input/output interface and/or a serial interface. Preferably, the power input/output interface is configured to connect a power source that needs to perform voltage conversion in the circuit system and a power source that needs to be obtained after the conversion. Preferably, the serial interface is: a 12C interface, a PMBUS interface or a GPIO interface. Preferably, the PWM control unit further comprises: a compensator configured to compensate each parameter used in the algorithm according to each parameter compensation value of the digital signal. Preferably, the digital power source is integrated in one module. According to another aspect of an embodiment of the present invention, a circuit board is provided, the circuit board comprising the digital power source of any of the above. Through the embodiment of the present invention, the digital power supply includes: a PWM control unit and a driving unit, which can fix the PCB layout and wiring in the digital power module, and the digital power supply integrates the PWM control unit and the driving unit in a digital power module. It is made into an integrated digital power module, which is installed on the circuit board during use. It does not need to pay attention to the circuit PCB layout inside the digital power supply. Compared with the existing digital power supply, it has better advantages and makes the digital power supply convenient. The ground is suitable for a variety of different applications, reducing the use of digital power. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate, FIG. Improperly qualified. 1 is a structural block diagram of a digital power supply according to an embodiment of the present invention; FIG. 2 is a structural block diagram of a digital power supply according to a preferred embodiment of the present invention; FIG. 3 is a circuit board according to an embodiment of the present invention. 4 is a block diagram of a digital power module in accordance with a preferred embodiment of the present invention; and FIG. 5 is a block diagram of the internal structure of a PWM control unit in accordance with a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In the embodiment, a digital power supply is provided. FIG. 1 is a structural block diagram of a digital power supply according to an embodiment of the present invention. As shown in FIG. 1, the digital power supply 10 includes: a pulse width modulation PWM control unit 12, and a Or a plurality of driving units 14, which are connected to the PWM control unit 12, and the digital power supply will be described below.

The PWM control unit 12 is configured to process the input signal and output the processed digital signal to the driving unit 14; the driving unit 14 is configured to drive the field effect transistor according to the digital signal processed by the PWM control unit 12. Through the above digital power supply, the pulse width modulation PWM control unit is integrated with the driving unit, and the PWM control unit processes the digital signal as long as the algorithm in the PWM control unit is edited. Preferably, a preferred method in implementation, that is, the digital power source mentioned in this embodiment and the following preferred embodiments can be integrated on one module and integrated into an integrated number with input, output and control pins. The power module only needs to be installed on the circuit board in its package. It does not need to lay out the PCB inside the digital power supply, so the same module can be used in many different modes and different applications. 2 is a block diagram showing the structure of a digital power supply according to a preferred embodiment of the present invention. As shown in FIG. 2, the digital power supply 10 includes: a PWM control unit 12, and one or more driving units 14, the driving unit 14 and the PWM. The control unit 12 is connected thereto. The PWM control unit 12 includes: an analog to digital converter 122, a memory 124, an interface 126 and a controller 128. The modules in the PWM control unit in the digital power supply are described below. The PWM control unit 12 includes: an analog to digital converter 122 configured to convert the sampled output analog voltage signal into a digital signal; a memory 124 configured to store an algorithm; and an interface 126 configured to provide an external device coupled to the digital power source An interface, the interface is further configured to receive an edit performed on an algorithm stored in the memory 124; the controller 128 is configured to process the digital signal in accordance with an algorithm in the memory 124. By setting the analog-to-digital converter 122, the memory 124, the interface 126, and the controller 128 in the PWM control unit, the memory 124 and the interface 126 can be used to easily edit the algorithm, and the manner of editing the algorithm can also be The digital power usage interface 126 is implemented with an external device. For example, the external device can be an MCU configured to perform online editing of the algorithm according to the needs of the digital power supply. According to the above algorithm, the controller 128 processes the digital signal and outputs it to the drive unit 14 through the interface to implement flexible configuration output control. Preferably, the driving unit 14 may include: a metal oxide semiconductor field effect transistor MOSFET driver. When using the driver, it is better to provide one or more voltage outputs according to user needs, wherein the one or more voltage outputs can be pre-configured, that is, the user can flexibly configure the output voltage according to his own needs. grade. In implementation, a power input and output interface and/or a serial interface is used as interface 126. The serial interface is a serial interface such as an I2C interface, a PMBUS interface, or a GPIO interface. Preferably, the PWM control unit 12 further includes: a compensator 120 (the dotted line in FIG. 2 indicates that the module is preferably), and is configured to compensate each parameter used in the algorithm according to each parameter compensation value of the digital signal, To improve the accuracy of the output power. For example, the error signal, the pulse width required for the driver stage, the delay value that drives the optimized output, the loop compensation parameters, and so on. In the present embodiment, a circuit board is also provided. FIG. 3 is a structural block diagram of a circuit board according to an embodiment of the present invention. As shown in FIG. 3, the circuit board 20 includes the digital power supply 10 of any of the above. The following description is made in conjunction with the preferred embodiments, which are combined with the above-described embodiments and preferred embodiments. 4 is a structural block diagram of a digital power module according to a preferred embodiment of the present invention. As shown in FIG. 4, the digital power module includes: a Micro Control Unit (MCU), which is set to be digital when powered on. The power module is programmed online. The MCU can be placed in the digital module as needed, or it can be selected independently of the digital module. a pulse width modulation (PWM) control unit for generating a control signal; a driving unit connected to the control signal; and an external control interface and an input/output interface of the entire digital power module, wherein the control interface can be set according to a specific situation For example, the control interface is used to transfer a PC or to connect to an MCU. This digital power supply is made into a small module with input, output and control pins, which is conveniently installed on the user board and flexibly configured according to user needs to achieve programmable voltage output. FIG. 5 is a block diagram showing the internal structure of a PWM control unit according to a preferred embodiment of the present invention, as shown in FIG. The PWM control unit uses an analog to digital converter to convert the sampled output voltage signal into a digital signal. The program memory stores the control algorithm of the microprocessor, and is set to execute a series of output values based on the analog-to-digital converter Calculation. The results of these calculations are parameters such as the error signal, the pulse width required for the driver stage, the delay value optimized for various drive outputs, and the loop compensation parameters. The external loop in the digital system no longer requires compensation components. During production, the reference comparison values of the parameters, such as output voltage, output current, and temperature limit values, are stored in non-volatile memory or can be downloaded to the data memory at system startup. The digital power module reserves a serial interface (for example, an I2C interface, a power management bus PMBUS interface, and a general purpose input output (GPIO)), and the PWM control unit is connected to the PC through a serial interface, and is configured to be implemented. The PC performs online programming of the PWM control unit or communication between the PC and the PWM control unit, and is connected to the MCU through an I2C interface, a PMBUS interface, a GPIO interface or other serial interface, and is configured to implement an online programming of the PWM control unit by the MCU. Or communication between the MCU and the PWM control unit for flexible system level control and diagnostics. PC and MCU need to be used in the initial stage of development. It is set to program the digital power module online. After the development is mature, the parameters required by the digital power supply can be directly burned into the memory of the power module, and the power module is powered up every time. Output according to pre-programmed parameters. Preferably, the driving unit uses a Metal-Oxide-Semicondutor Field-Effect Transistor (MOSFET) driver, which can be easily connected to the PWM control unit, and can be programmed online according to user needs. More voltage output, each output can be flexibly configured according to user needs. The input interface is mainly to input the voltage that needs to be converted. The output interface is set to output a variety of different voltage levels that the user needs. It can be programmed to output one or more outputs according to user needs. The preferred embodiment can flexibly control the power output of each channel or turn off the power output. The turn-on time and turn-off time of each output power supply are adjustable, and are set to achieve the upper and lower power timing control of different output of the same power module. The layout of the digital power supply PCB layout needs to make the switch node area suitable, reduce the return path of the gate drive circuit, reduce the return path of the closed loop, clean feedback loop and the appropriate ground plane, in order to make the digital power supply normal. jobs. The PCB layout and wiring in the digital power module are fixed by the above preferred embodiment to form an integrated digital power module, which allows the user to conveniently and conveniently use in different use situations without paying attention to the layout and wiring in the digital power module. The application of the digital power module reduces the use threshold of the digital power supply. INDUSTRIAL APPLICABILITY The present invention is applicable not only to applications capable of using existing data power sources, but also to applications requiring a smaller size of the digital power supply and an inability to meet the existing circuit PCB layout and wiring requirements. The utility model can make the digital power source have smaller volume and lower cost, reduce the use threshold of the digital power source, and expand the use range of the digital power source. It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented in a common circuit arrangement that can be concentrated on a single circuit arrangement or distributed across multiple circuit arrangements. Thus, the invention is not limited to any specific combination of hardware and software. The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A digital power supply, comprising: a pulse width modulation PWM control unit, and one or more driving units, wherein the driving unit is connected to the PWM control unit, wherein

The PWM control unit is configured to process the input signal, and output the processed digital signal to the driving unit;

The driving unit is configured to drive the field effect transistor according to the digital signal processed by the PWM control unit.

2. The digital power supply of claim 1, wherein the PWM comprises:

An analog to digital converter, configured to convert the sampled output analog voltage signal into a digital signal; a memory, set to a storage algorithm;

An interface, configured to provide an interface for an external device to connect to the digital power source, the interface further configured to receive an edit performed on an algorithm stored by the memory;

A controller is arranged to process the digital signal in accordance with an algorithm in the memory.

3. The digital power supply of claim 1, wherein the driving unit comprises: a metal oxide semiconductor field effect transistor MOSFET driver.

4. The digital power supply of claim 3 wherein the MOSFET driver is configured to provide one or more voltage outputs, the one or more voltage outputs being pre-configurable.

5. The digital power supply of claim 2, wherein the interface is a power input/output interface and/or a serial interface.

6. The digital power supply according to claim 5, wherein the power input/output interface is configured to connect a power source that needs to perform voltage conversion in the circuit system and a power source that needs to be obtained after the conversion.

7. The digital power supply of claim 5, wherein the serial interface is: a 12C interface, a PMBUS interface, or a GPIO interface.

8. The digital power supply according to claim 1, wherein the PWM control unit further comprises: a compensator configured to compensate for each parameter used in the algorithm according to each parameter compensation value of the digital signal.

The digital power supply according to any one of claims 1 to 8, wherein the digital power supply is integrated in a module.

A circuit board comprising the digital power supply of any one of claims 1 to 9.