CN100490283C - Unisolated switch DC-DC power supply module, power supply device and communication device - Google Patents
Unisolated switch DC-DC power supply module, power supply device and communication device Download PDFInfo
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- CN100490283C CN100490283C CNB2007101079631A CN200710107963A CN100490283C CN 100490283 C CN100490283 C CN 100490283C CN B2007101079631 A CNB2007101079631 A CN B2007101079631A CN 200710107963 A CN200710107963 A CN 200710107963A CN 100490283 C CN100490283 C CN 100490283C
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
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Abstract
本发明涉及电子通信技术领域,公开非隔离开关直流-直流电源模块,包括脉宽调制PWM发生器和稳压变换电路,稳压变换电路包括一对耦合连接的晶体管,PWM发生器输出一对PWM信号控制该对晶体管选择性的在导通状态和关断状态之间切换,以对电源模块的输入电压进行降压后输出,其中,PWM发生器通过对应的PWM信号配置各个稳压变换电路中晶体管的开关频率是前级预稳压变换电路中晶体管的开关频率的分频。本发明还公开电源装置和通信装置。本发明实施例可以实现向负载提供较低输出电压时,避免电路效率的降低。
The invention relates to the technical field of electronic communication, and discloses a non-isolated switch DC-DC power supply module, including a pulse width modulation PWM generator and a voltage stabilizing conversion circuit, the voltage stabilizing conversion circuit includes a pair of transistors coupled and connected, and the PWM generator outputs a pair of PWM The signal controls the pair of transistors to selectively switch between the on-state and the off-state, so as to step down the input voltage of the power module and output it, wherein, the PWM generator configures each voltage regulation conversion circuit through the corresponding PWM signal The switching frequency of the transistor is the frequency division of the switching frequency of the transistor in the pre-stage pre-stabilization conversion circuit. The invention also discloses a power supply device and a communication device. The embodiments of the present invention can avoid reduction of circuit efficiency when a lower output voltage is provided to the load.
Description
技术领域 technical field
本发明涉及电子通信技术领域,尤其涉及非隔离开关直流-直流电源技术。The invention relates to the technical field of electronic communication, in particular to the non-isolated switch DC-DC power supply technology.
背景技术 Background technique
随着CPU等超大规模集成电路的集成度和处理速度的不断提高,如何设计具有宽范围电压输入且高效率的非隔离低压大电流开关直流-直流(DC-DC)变换电源成为供电电路设计的主要任务之一。图1给出了现有技术中一种非隔离低压大电流开关DC-DC变换电源电路的结构图,该电路中包括脉宽调制(Pulse Width Modulation,简称PWM)发生器以及多相同步整流降压式稳压变换电路(Buck电路),PWM发生器输出PWM信号控制每一相Buck电路中的一对金属-氧化物-半导体场效应管(以下简称MOS管)和选择性的在导通和关断状态间切换,达到对输入电压进行降压的目的;在上述电源电路中,输出电压的平均值U0为:With the continuous improvement of the integration and processing speed of VLSI such as CPU, how to design a non-isolated low-voltage high-current switching DC-DC (DC-DC) conversion power supply with a wide range of voltage input and high efficiency has become a key issue in the design of power supply circuits. One of the main tasks. Figure 1 shows a structure diagram of a non-isolated low-voltage high-current switching DC-DC conversion power supply circuit in the prior art, which includes a pulse width modulation (Pulse Width Modulation, PWM for short) generator and a multi-phase synchronous rectification step-down Voltage regulator conversion circuit (Buck circuit), the PWM generator outputs a PWM signal to control a pair of metal-oxide-semiconductor field effect transistors (hereinafter referred to as MOS transistors) in each phase of the Buck circuit and selectively conduct and switch between off states to achieve the purpose of stepping down the input voltage; in the above power supply circuit, the average value U0 of the output voltage is:
其中,ton为MOS管处于导通状态的时间;toff为MOS管处于关断状态的时间;VDD为电源电路的输入电压;T=ton+toff,为MOS管的开关周期;k为MOS管的导通占空比(以下简称占空比)。Among them, t on is the time when the MOS tube is in the on state; t off is the time when the MOS tube is in the off state; V DD is the input voltage of the power circuit; T=t on +t off is the switching period of the MOS tube; k is the conduction duty cycle of the MOS transistor (hereinafter referred to as the duty cycle).
近年来,如CPU等负载所需的输入电压越来越低,根据上述公式(1),在上述电源电路中如果要提供更低的输出电压,在输入电压固定的情况下,需要降低MOS管的占空比,即缩短MOS管的导通时间变短,这样会导致MOS管的开关损耗增大,使电路的效率降低。In recent years, the input voltage required by loads such as CPUs has become lower and lower. According to the above formula (1), if a lower output voltage is to be provided in the above power supply circuit, the MOS transistor needs to be reduced when the input voltage is fixed. The duty cycle of the MOS tube is shortened, that is, the conduction time of the MOS tube is shortened, which will increase the switching loss of the MOS tube and reduce the efficiency of the circuit.
此外,现有技术中每一相Buck电路中MOS管的工作频率都较高,使得MOS管的开关损耗和驱动损耗较大,进一步降低了电路的效率。In addition, in the prior art, the operating frequency of the MOS transistors in each phase of the Buck circuit is relatively high, resulting in large switching losses and driving losses of the MOS transistors, further reducing the efficiency of the circuit.
发明内容 Contents of the invention
本发明的实施例要解决的技术问题是提供非隔离开关直流-直流电源模块、电源装置和通信装置,可以达到向负载提供较低输出电压时,避免电路效率的降低。The technical problem to be solved by the embodiments of the present invention is to provide a non-isolated switch DC-DC power supply module, a power supply device and a communication device, which can avoid the reduction of circuit efficiency when a lower output voltage is provided to the load.
为解决上述技术问题,本发明的实施例提供以下技术方案:In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
一种非隔离开关直流-直流电源模块,包括脉宽调制PWM发生器和稳压变换电路,所述稳压变换电路包括一对耦合连接的晶体管,所述PWM发生器输出一对PWM信号控制所述该对晶体管选择性的在导通状态和关断状态之间切换,以对所述电源模块的输入电压进行降压后输出,其中,在所述电源模块的电源端子和所述稳压变换电路之间连接至少一级前级预稳压变换电路,用于在PWM发生器输出的对应PWM信号的控制下对所述电源模块的输入电压进行前级降压,所述前级预稳压变换电路包括一对耦合连接的晶体管、一电感器和一电容器,该对晶体管在所述PWM发生器输出的对应PWM信号控制下选择性的在导通状态和关断状态之间切换,所述电感器一端与电容器连接,另一端与所述晶体管对耦合连接,所述电容器接于电感器和地之间,所述电源模块包括至少两个稳压变换电路,所述PWM发生器通过对应的PWM信号配置各个稳压变换电路中晶体管的开关频率是前级预稳压变换电路中晶体管的开关频率的分频。A non-isolated switch DC-DC power supply module, including a pulse width modulation PWM generator and a voltage stabilization conversion circuit, the voltage stabilization conversion circuit includes a pair of coupled transistors, and the PWM generator outputs a pair of PWM signals to control the The pair of transistors are selectively switched between the on state and the off state, so as to step down the input voltage of the power module and output it, wherein, the power terminal of the power module and the voltage regulator At least one stage of pre-stage pre-stabilization conversion circuit is connected between the circuits, which is used to perform pre-stage step-down on the input voltage of the power module under the control of the corresponding PWM signal output by the PWM generator, and the pre-stage pre-stabilization The conversion circuit includes a pair of coupled transistors, an inductor and a capacitor, and the pair of transistors are selectively switched between the on state and the off state under the control of the corresponding PWM signal output by the PWM generator, and the One end of the inductor is connected to the capacitor, and the other end is coupled to the transistor pair, the capacitor is connected between the inductor and the ground, the power module includes at least two constant voltage conversion circuits, and the PWM generator passes through the corresponding PWM signal configuration The switching frequency of the transistors in each voltage stabilizing conversion circuit is the frequency division of the switching frequency of the transistors in the pre-stage pre-stabilizing conversion circuit.
一种通信装置,包括非隔离开关直流-直流电源模块,所述电源模块包括:脉宽调制PWM发生器和稳压变换电路,所述稳压变换电路包括一对耦合连接的晶体管,所述PWM发生器输出一对PWM信号控制所述该对晶体管选择性的在导通状态和关断状态之间切换,以对所述电源模块的输入电压进行降压后输出,其中,在所述电源模块的电源端子和所述稳压变换电路之间连接至少一级前级预稳压变换电路,用于在PWM发生器输出的对应PWM信号的控制下对所述电源模块的输入电压进行前级降压,所述前级预稳压变换电路包括一对耦合连接的晶体管、一电感器和一电容器,该对晶体管在所述PWM发生器输出的对应PWM信号控制下选择性的在导通状态和关断状态之间切换,所述电感器一端与电容器连接,另一端与所述晶体管对耦合连接,所述电容器接于电感器和地之间,所述电源模块包括至少两个稳压变换电路;所述PWM发生器通过对应的PWM信号配置各个稳压变换电路中晶体管的开关频率是前级预稳压变换电路中晶体管的开关频率的分频。A communication device, including a non-isolated switch DC-DC power supply module, the power supply module includes: a pulse width modulation PWM generator and a voltage stabilization conversion circuit, the voltage stabilization conversion circuit includes a pair of coupled transistors, the PWM The generator outputs a pair of PWM signals to control the pair of transistors to selectively switch between the on state and the off state, so as to step down the input voltage of the power module and output it, wherein, in the power module At least one pre-stage pre-stabilization conversion circuit is connected between the power supply terminal of the power supply terminal and the voltage stabilization conversion circuit, which is used to step down the input voltage of the power supply module under the control of the corresponding PWM signal output by the PWM generator. voltage, the pre-stage pre-regulated conversion circuit includes a pair of coupled transistors, an inductor and a capacitor, and the pair of transistors are selectively in the conduction state and under the control of the corresponding PWM signal output by the PWM generator. Switching between off states, one end of the inductor is connected to a capacitor, the other end is coupled to the transistor pair, the capacitor is connected between the inductor and ground, and the power module includes at least two voltage-stabilizing conversion circuits The PWM generator configures the switching frequency of the transistors in each voltage-stabilizing conversion circuit through the corresponding PWM signal to be the frequency division of the switching frequency of the transistors in the pre-stage pre-stabilizing conversion circuit.
一种电源装置,包括非隔离开关直流-直流电源模块,所述电源模块包括:脉宽调制PWM发生器和稳压变换电路,所述稳压变换电路包括一对耦合连接的晶体管,所述PWM发生器输出一对PWM信号控制所述该对晶体管选择性的在导通状态和关断状态之间切换,以对所述电源模块的输入电压进行降压后输出,其中,在所述电源模块的电源端子和所述稳压变换电路之间连接至少一级前级预稳压变换电路,用于在PWM发生器输出的对应PWM信号的控制下对所述电源模块的输入电压进行前级降压,所述前级预稳压变换电路包括一对耦合连接的晶体管、一电感器和一电容器,该对晶体管在所述PWM发生器输出的对应PWM信号控制下选择性的在导通状态和关断状态之间切换,所述电感器一端与电容器连接,另一端与所述晶体管对耦合连接,所述电容器接于电感器和地之间,所述电源模块包括至少两个稳压变换电路;所述PWM发生器通过对应的PWM信号配置各个稳压变换电路中晶体管的开关频率是前级预稳压变换电路中晶体管的开关频率的分频。A power supply device, including a non-isolated switch DC-DC power supply module, the power supply module includes: a pulse width modulation PWM generator and a voltage stabilization conversion circuit, the voltage stabilization conversion circuit includes a pair of coupled transistors, the PWM The generator outputs a pair of PWM signals to control the pair of transistors to selectively switch between the on state and the off state, so as to step down the input voltage of the power module and output it, wherein, in the power module At least one pre-stage pre-stabilization conversion circuit is connected between the power supply terminal of the power supply terminal and the voltage stabilization conversion circuit, which is used to step down the input voltage of the power supply module under the control of the corresponding PWM signal output by the PWM generator. voltage, the pre-stage pre-regulated conversion circuit includes a pair of coupled transistors, an inductor and a capacitor, and the pair of transistors are selectively in the conduction state and under the control of the corresponding PWM signal output by the PWM generator. Switching between off states, one end of the inductor is connected to a capacitor, the other end is coupled to the transistor pair, the capacitor is connected between the inductor and ground, and the power module includes at least two voltage-stabilizing conversion circuits The PWM generator configures the switching frequency of the transistors in each voltage-stabilizing conversion circuit through the corresponding PWM signal to be the frequency division of the switching frequency of the transistors in the pre-stage pre-stabilizing conversion circuit.
从以上技术方案可以看出,本发明的实施例具有以下有益效果:As can be seen from the above technical solutions, the embodiments of the present invention have the following beneficial effects:
通过在电源模块的电源端子和向负载供电的稳压变换电路之间增加前级预稳压变换电路,降低所述稳压变换电路的输入电压,根据公式(1),当需要向负载提供较低的输出电压时,由于输入电压和输出电压均降低,因此,对所述稳压变换电路中晶体管的占空比的影响很小;而现有技术中,需要向负载提供较低的输出电压时,由于输入电压固定(由电源模块的电源端子提供),因此需要降低晶体管的占空比;因此,向负载提供较低的输出电压时,与现有技术相比,本发明实施例能够避免稳压变换电路中晶体管占空比的降低,从而避免了晶体管开关损耗的增加以及电路效率的降低。By adding a pre-stage pre-stabilization conversion circuit between the power supply terminal of the power module and the voltage stabilization conversion circuit that supplies power to the load, the input voltage of the voltage stabilization conversion circuit is reduced. According to formula (1), when it is necessary to provide a higher voltage to the load When the output voltage is low, since both the input voltage and the output voltage are reduced, the impact on the duty cycle of the transistor in the voltage stabilizing conversion circuit is very small; while in the prior art, a lower output voltage needs to be provided to the load When , since the input voltage is fixed (provided by the power terminal of the power module), it is necessary to reduce the duty cycle of the transistor; therefore, when a lower output voltage is provided to the load, compared with the prior art, the embodiment of the present invention can avoid The reduction of the duty cycle of the transistor in the voltage stabilizing conversion circuit avoids the increase of the switching loss of the transistor and the reduction of the circuit efficiency.
附图说明 Description of drawings
图1是现有技术中一种非隔离低压大电流开关DC-DC变换电源电路的结构图;Fig. 1 is a structural diagram of a non-isolated low-voltage high-current switch DC-DC conversion power supply circuit in the prior art;
图2是本发明实施例一非隔离开关直流-直流电源模块的结构图;2 is a structural diagram of a non-isolated switch DC-DC power supply module according to an embodiment of the present invention;
图3是本发明实施例一中各相稳压变换电路与前级预稳压变换电路MOS管开关频率的相位关系示意图;3 is a schematic diagram of the phase relationship between each phase voltage stabilization conversion circuit and the pre-stage pre-stabilization conversion circuit MOS tube switching frequency in Embodiment 1 of the present invention;
图4是本发明实施例二非隔离开关直流-直流电源模块的结构图;FIG. 4 is a structural diagram of a non-isolated switch DC-DC power supply module according to Embodiment 2 of the present invention;
图5是本发明实施例三非隔离开关直流-直流电源模块的结构图;Fig. 5 is a structural diagram of a non-isolated switch DC-DC power supply module according to Embodiment 3 of the present invention;
图6是本发明实施例四非隔离开关直流-直流电源模块的结构图。Fig. 6 is a structural diagram of a non-isolated switch DC-DC power supply module according to Embodiment 4 of the present invention.
具体实施方式 Detailed ways
本发明提供了非隔离开关直流-直流电源模块、电源装置和通信装置,下面对所述模块和装置的实施例进行详细描述。The invention provides a non-isolated switch DC-DC power supply module, a power supply device and a communication device, and the embodiments of the modules and devices are described in detail below.
实施例一、一种非隔离开关直流-直流电源模块,参考图2,包括PWM发生器100、稳压变换电路组200和前级预稳压变换电路300;Embodiment 1. A non-isolated switch DC-DC power supply module, referring to FIG. 2 , includes a PWM generator 100, a voltage stabilization conversion circuit group 200 and a pre-stage pre-regulation conversion circuit 300;
所述前级预稳压变换电路300包括一对MOS管301和302、一电感器310和一电容器320;MOS管301的漏极与所述电源模块的电源端子VDD连接;MOS管302的漏极与MOS管301的源极连接,其源极与地连接;所述电感器310一端与电容器320连接,另一端与MOS管301的源极及MOS管302的漏极耦合连接;所述电容器320接于电感器310和地之间;The pre-stage pre-stabilization conversion circuit 300 includes a pair of
稳压变换电路组200中每一稳压变换电路的结构与所述前级预稳压变换电路300的结构相同,也包括一对MOS管201和202、一电感器210和一电容器220,各元件之间的连接与所述前级预稳压变换电路300相似,区别之处在于MOS管201的漏极是与前级预稳压变换电路300的电感器310和电容器320耦合连接;The structure of each voltage-stabilizing conversion circuit in the voltage-stabilizing conversion circuit group 200 is the same as that of the pre-stage pre-regulated voltage conversion circuit 300, and also includes a pair of
所述PWM发生器100向所述稳压变换电路200和前级预稳压变换电路300中各MOS管(201、202、301和302)的栅极输出PWM信号,控制各MOS管在导通与关断状态之间切换,所述稳压变换电路200和前级预稳压变换电路300中的各对MOS管设置为不同的状态;The PWM generator 100 outputs a PWM signal to the gates of the MOS transistors (201, 202, 301 and 302) in the voltage stabilizing conversion circuit 200 and the pre-stage pre-stabilizing conversion circuit 300 to control the conduction of each MOS transistor. To switch between the off state, each pair of MOS transistors in the voltage stabilization conversion circuit 200 and the pre-stage pre-stabilization conversion circuit 300 is set to a different state;
本实施例中所述预稳压变换电路300工作原理与所述稳压变换电路的工作原理相同,主要是通过PWM发生器输出的PWM信号控制电路中的MOS管对301和302选择性的在导通与关断状态之间切换,达到对该电路的输入电压进行降压的目的;具体来说,当MOS管301导通时,MOS管302关断,电流从VDD流经MOS管301和电感器310而使电容器320充电;当MOS管301关断时,MOS管302导通,为电流提供续流通路,使电容器320放电;The working principle of the pre-stabilization conversion circuit 300 in this embodiment is the same as that of the voltage stabilization conversion circuit, mainly through the PWM signal output by the PWM generator to control the
在本实施例中,所述稳压变换电路组200中各稳压变换电路的电容器彼此并联连接后向负载供电,组成多相稳压变换电路,可以以较高的效率产生较大的输出电流;其中,PWM发生器通过对应的PWM信号配置各相稳压变换电路彼此在不同相位下工作,并可以配置每相稳压变换电路中MOS管的开关频率为所述前级预稳压变换电路中MOS管的开关频率的N分频,以及使得各相稳压变换电路中MOS管的导通状态交替地与前级预稳压变换电路中MOS管的导通状态同步,其中,N等于稳压变换电路个数之和;举例来说,若稳压变换电路组200组成4相稳压变换电路,若前级预稳压变换电路中MOS管的开关频率为f,则每相稳压变换电路中MOS管的开关频率是f的4分频,即f/4,各相稳压变换电路彼此在不同相位下工作,且各相电路中MOS管的导通状态交替地与前级预稳压变换电路中MOS管的导通状态同步,所述各相稳压变换电路与前级预稳压变换电路MOS管开关频率的相位关系可参考图3。In this embodiment, the capacitors of the voltage stabilization conversion circuits in the voltage stabilization conversion circuit group 200 are connected in parallel to each other to supply power to the load to form a multi-phase voltage stabilization conversion circuit, which can generate a larger output current with higher efficiency. ; Wherein, the PWM generator configures the voltage-stabilizing transformation circuits of each phase to work in different phases with each other through the corresponding PWM signal, and can configure the switching frequency of the MOS tube in the voltage-stabilizing transformation circuit of each phase to be the pre-stage pre-stabilizing transformation circuit The N frequency division of the switching frequency of the MOS tube in the middle, and the conduction state of the MOS tube in the voltage stabilization conversion circuit of each phase is alternately synchronized with the conduction state of the MOS tube in the pre-stage pre-regulation conversion circuit, where N is equal to the stability The sum of the number of voltage conversion circuits; for example, if the voltage stabilization conversion circuit group 200 forms a 4-phase voltage stabilization conversion circuit, if the switching frequency of the MOS tube in the pre-stage pre-stabilization conversion circuit is f, then each phase voltage stabilization conversion The switching frequency of the MOS tube in the circuit is divided by 4 of f, that is, f/4. The voltage stabilization and conversion circuits of each phase work in different phases, and the conduction state of the MOS tube in each phase circuit is alternately with the pre-stabilized state of the previous stage. The conduction state of the MOS transistors in the voltage conversion circuit is synchronized, and the phase relationship between the voltage stabilization conversion circuit of each phase and the switching frequency of the MOS transistors of the pre-stage pre-regulation conversion circuit can be referred to in FIG. 3 .
实施例二、一种非隔离开关直流-直流电源模块,参考图4,本实施例与实施例一基本相同,主要区别在于:在本实施例中,所述稳压变换电路组中各稳压变换电路单独进行输出,组成多路稳压变换电路,可以分别向多个负载供电;与实施例一类似,PWM发生器也可以通过对应的PWM信号配置各稳压变换电路彼此在不同相位下工作,并可以配置每路稳压变换电路中MOS管的开关频率为所述前级预稳压变换电路中MOS管开关频率N分频,以及使得各路稳压变换电路中MOS管的导通状态交替地与前级预稳压变换电路中MOS管的导通状态同步,其中,N等于稳压变换电路个数之和。Embodiment 2. A non-isolated switch DC-DC power supply module. Referring to FIG. 4, this embodiment is basically the same as Embodiment 1, the main difference is that in this embodiment, each voltage regulator in the voltage stabilization conversion circuit group The conversion circuit outputs separately to form a multi-channel voltage-stabilizing conversion circuit, which can supply power to multiple loads respectively; similar to Embodiment 1, the PWM generator can also configure each voltage-stabilizing conversion circuit to work in different phases with each other through the corresponding PWM signal , and can configure the switching frequency of the MOS tube in each voltage-stabilizing conversion circuit to be N divided by the switching frequency of the MOS tube in the pre-stage pre-stabilizing conversion circuit, and make the conduction state of the MOS tube in each voltage-stabilizing conversion circuit Alternately synchronizing with the conduction state of the MOS transistor in the pre-stage pre-stabilization conversion circuit, wherein, N is equal to the sum of the number of voltage stabilization conversion circuits.
实施例三、一种非隔离开关直流-直流电源模块,参考图5,本实施例与实施例一基本相同,主要区别在于:在本实施例中,所述稳压变换电路组中有部分稳压变换电路组成多相稳压变换电路后输出,这样组成多相多路稳压变换电路;与实施例一类似,PWM发生器也可以通过对应的PWM信号配置各稳压变换电路彼此在不同相位下工作,并可以配置每一电路中MOS管的开关频率为所述前级预稳压变换电路中MOS管的开关频率的N分频,以及使得各稳压变换电路中MOS管的导通状态交替地与前级预稳压变换电路中MOS管的导通状态同步,其中,N等于稳压变换电路个数之和。Embodiment 3. A non-isolated switch DC-DC power supply module. Referring to FIG. 5, this embodiment is basically the same as Embodiment 1, the main difference is: in this embodiment, there are some stabilizing The voltage conversion circuit forms a multi-phase voltage stabilization conversion circuit and then outputs, thus forming a multi-phase multi-channel voltage stabilization conversion circuit; similar to Embodiment 1, the PWM generator can also configure each voltage stabilization conversion circuit in different phases through the corresponding PWM signal. It works under the following conditions, and can configure the switching frequency of the MOS transistors in each circuit to be the N frequency division of the switching frequency of the MOS transistors in the pre-stage pre-stabilization conversion circuit, and make the conduction state of the MOS transistors in each voltage stabilization conversion circuit Alternately synchronizing with the conduction state of the MOS transistor in the pre-stage pre-stabilization conversion circuit, wherein, N is equal to the sum of the number of voltage stabilization conversion circuits.
在本发明上述实施例中,所述PWM发生器可以根据实际情况的需要输出占空比固定的PWM信号输出到所述稳压变换电路或前级预稳压变换电路,也可以对所述稳压变换电路或前级预稳压变换电路的输出电压进行检测,并依据检测结果对输出到所述稳压变换电路或前级预稳压变换电路的PWM信号的占空比进行调整,以对所述稳压变换电路或前级预稳压变换电路的输出电压进行调整。In the above embodiments of the present invention, the PWM generator can output a PWM signal with a fixed duty ratio to the voltage stabilizing conversion circuit or the pre-stage pre-stabilizing conversion circuit according to the needs of the actual situation, and can also output the PWM signal to the stable voltage The output voltage of the voltage conversion circuit or the pre-stage pre-stabilization conversion circuit is detected, and the duty cycle of the PWM signal output to the voltage stabilization conversion circuit or the previous-stage pre-stabilization conversion circuit is adjusted according to the detection result, so as to The output voltage of the voltage stabilizing transformation circuit or the pre-stage pre-stabilizing transformation circuit is adjusted.
在本发明电源模块更多实施例中,也可以将经所述前级预稳压变换电路降压后的电信号分出至少一路直接输出,以给其他电源模块供电。In more embodiments of the power module of the present invention, at least one path of the electrical signal that has been stepped down by the pre-stage pre-stabilization conversion circuit can also be divided and output directly to supply power to other power modules.
在本发明上述实施例中是以一级前级预稳压变换电路进行说明,在本发明电源模块更多实施例中,也可以根据实际情况考虑需要采用两级或两级以上的多级前级预稳压变换电路。In the above embodiments of the present invention, a one-stage pre-stage pre-stabilization conversion circuit is used for illustration. In more embodiments of the power module of the present invention, it is also possible to consider the need to use two or more stages of multi-stage pre-voltage conversion circuits according to actual conditions. Stage pre-regulation conversion circuit.
实施例四、一种非隔离开关直流-直流电源模块,参考图6,本实施例与实施例一类似,主要区别在于,在本实施例中,采用两级前级预稳压变换电路,每级前级预稳压变换电路的结构与上述实施例中所述前级预稳压变换电路的结构基本相同,区别之处在于:Embodiment 4. A non-isolated switch DC-DC power supply module. Referring to FIG. 6, this embodiment is similar to Embodiment 1, the main difference is that in this embodiment, two stages of pre-stage pre-stabilization conversion circuits are used, each The structure of the pre-stage pre-stabilization transformation circuit is basically the same as that of the pre-stage pre-stabilization transformation circuit described in the above embodiment, the difference is:
前级预稳压变换电路400的MOS管401的漏极与所述电源模块的电源端子VDD连接;前级预稳压变换电路500的MOS管501的漏极与前级预稳压变换电路400的电感器410和电容器420耦合连接,即将前一级前级预稳压变换电路输出的电压作为后一级前级预稳压变换电路的输入电压;The drain of the MOS transistor 401 of the pre-stage pre-stabilization conversion circuit 400 is connected to the power supply terminal V DD of the power module; The inductor 410 and the capacitor 420 of 400 are coupled and connected, that is, the voltage output by the pre-stage pre-stabilization conversion circuit of the previous stage is used as the input voltage of the pre-stage pre-stabilization conversion circuit of the subsequent stage;
PWM发生器600向前级预稳压变换电路400和前级预稳压变换电路500中各MOS管的栅极输出PWM信号,控制各MOS管在导通与关断状态之间切换,并配置前级预稳压变换电路400中MOS管的导通状态与前级预稳压变换电路500中MOS管的导通状态同步。The PWM generator 600 outputs PWM signals to the gates of the MOS transistors in the pre-stage pre-regulated voltage conversion circuit 400 and the pre-stage pre-regulated voltage conversion circuit 500 to control each MOS transistor to switch between on and off states, and configure The conduction state of the MOS transistor in the pre-stage pre-stabilization conversion circuit 400 is synchronized with the conduction state of the MOS transistor in the pre-stage pre-regulation conversion circuit 500 .
在本发明电源模块更多实施例中,在稳压变换电路组,和/或前级预稳压变换电路中,也可以采用MOS管以外的其他开关晶体管,如双极型晶体管(BJT)或绝缘栅双极晶体管(IGBT)等。In more embodiments of the power module of the present invention, other switching transistors other than MOS tubes, such as bipolar transistors (BJT) or Insulated Gate Bipolar Transistor (IGBT), etc.
本发明实施例还提供一种通信装置,可以包括上述任一电源模块实施例中所述的非隔离开关直流-直流电源模块。An embodiment of the present invention also provides a communication device, which may include the non-isolated switch DC-DC power module described in any of the power module embodiments above.
本发明实施例还提供一种电源装置,可以包括上述任一电源模块实施例中所述的非隔离开关直流-直流电源模块。An embodiment of the present invention also provides a power supply device, which may include the non-isolated switch DC-DC power supply module described in any of the above power module embodiments.
在本发明上述实施例中,通过在电源模块的电源端子和向负载供电的稳压变换电路之间增加前级预稳压变换电路,降低所述稳压变换电路的输入电压,根据公式(1),当需要向负载提供较低的输出电压时,由于输入电压和输出电压均降低,因此,对所述稳压变换电路中晶体管占空比的影响很小;而现有技术中,需要向负载提供较低的输出电压时,由于输入电压固定(由电源模块的电源端子提供),因此需要降低晶体管的占空比;因此,向负载提供较低的输出电压时,与现有技术相比,本发明实施例能够避免稳压变换电路中晶体管占空比的降低,从而避免了晶体管开关损耗的增加以及电路效率的降低;In the above-mentioned embodiments of the present invention, the input voltage of the voltage-stabilizing conversion circuit is reduced by adding a pre-stage pre-stabilizing conversion circuit between the power supply terminal of the power supply module and the voltage-stabilizing conversion circuit supplying power to the load, according to the formula (1 ), when it is necessary to provide a lower output voltage to the load, since both the input voltage and the output voltage are reduced, the impact on the duty cycle of the transistor in the voltage stabilizing conversion circuit is very small; and in the prior art, it is necessary to provide When the load provides a lower output voltage, since the input voltage is fixed (provided by the power terminal of the power module), it is necessary to reduce the duty cycle of the transistor; therefore, when providing a lower output voltage to the load, compared with the existing technology , the embodiment of the present invention can avoid the reduction of the duty cycle of the transistor in the voltage stabilizing conversion circuit, thereby avoiding the increase of the switching loss of the transistor and the reduction of the circuit efficiency;
此外,在电源模块的电源端子和稳压变换电路之间增加前级预稳压变换电路也可以达到增大电源模块的输入电压范围的效果;以向负载提供1V的供电电压为例,若晶体管工作的占空比范围为20%-50%,根据公式(1),无前级预稳压变换电路时,电源模块的输入电压的范围为2V-5V;而增加前级预稳压变换电路后,电源模块的输入电压范围可以达到4V-25V。In addition, adding a pre-stage pre-stabilization conversion circuit between the power supply terminal of the power module and the voltage stabilization conversion circuit can also achieve the effect of increasing the input voltage range of the power module; taking the supply voltage of 1V to the load as an example, if the transistor The working duty cycle range is 20%-50%. According to the formula (1), when there is no pre-stage pre-regulation conversion circuit, the input voltage range of the power module is 2V-5V; and the pre-stage pre-regulation conversion circuit is added Finally, the input voltage range of the power module can reach 4V-25V.
以上对本发明所提供的非隔离开关直流-直流电源模块、电源装置和通信装置进行了详细介绍,本文中应用了具体个例对本发明的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其思想;同时,对于本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处,综上所述,本说明书内容不应理解为对本发明的限制。The non-isolated switch DC-DC power supply module, power supply device and communication device provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used To help understand the method and its ideas of the present invention; at the same time, for those of ordinary skill in the art, according to the ideas of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification It should not be construed as limiting the invention.
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