CN106374753B - Power conversion system and control method thereof - Google Patents
Power conversion system and control method thereofDownload PDFInfo
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- CN106374753B CN106374753BCN201611037146.9ACN201611037146ACN106374753BCN 106374753 BCN106374753 BCN 106374753BCN 201611037146 ACN201611037146 ACN 201611037146ACN 106374753 BCN106374753 BCN 106374753B
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及电路领域，尤其涉及一种电源转换系统及其控制方法。The invention relates to the field of circuits, in particular to a power conversion system and a control method thereof.
背景技术Background technique
随着Type-C、PD协议和多种快充协议的提出，通过一个电源转换系统实现对几十种不同设备进行充电成为可能。不同设备要求的充电电压之间可能存在高达十几伏的压差，并且不同设备要求的充电功率之间可能存在高达几十瓦的功率差。传统的反激式电源转换系统是固定增益的系统，这使得其对一些设备的充电效率很高，而对其他设备的充电效率很低，因此导致系统能耗很高，无法实现效率最优化，从而无法满足当前市场上的新能源的标准。With the introduction of Type-C, PD protocol and various fast charging protocols, it is possible to charge dozens of different devices through a power conversion system. There may be a voltage difference of up to ten volts between the charging voltages required by different devices, and a power difference of up to several tens of watts between the charging powers required by different devices. The traditional flyback power conversion system is a fixed-gain system, which makes it charge some devices with high efficiency, while charging other devices with low efficiency, resulting in high system energy consumption and inability to achieve efficiency optimization. Therefore, it cannot meet the new energy standards on the current market.
发明内容SUMMARY OF THE INVENTION
鉴于以上所述的一个或多个问题，本发明提供了一种新颖的电源转换系统及其控制方法。In view of one or more of the above-mentioned problems, the present invention provides a novel power conversion system and a control method thereof.
根据本发明实施例的电源转换系统，包括变压器、开关管、以及控制器，该控制器被配置为：基于变压器的副边侧的输出电压的互感电压调节第一电阻的阻值；利用第一电阻和第二电阻对该输出电压的反馈电压进行分压，生成反馈分压电压；将反馈分压电压与表征流过变压器的原边侧的输入电流的电流感测电压进行比较，生成关断控制信号；以及基于关断控制信号，控制开关管的关断。A power conversion system according to an embodiment of the present invention includes a transformer, a switch tube, and a controller. The controller is configured to: adjust the resistance value of the first resistor based on the mutual inductance voltage of the output voltage on the secondary side of the transformer; The resistor and the second resistor divide the feedback voltage of the output voltage to generate a feedback divided voltage; compare the feedback divided voltage with the current sensing voltage representing the input current flowing through the primary side of the transformer to generate a shutdown a control signal; and based on the turn-off control signal, controlling the turn-off of the switch tube.
根据本发明实施例的电源转换系统的控制方法，该电源转换系统包括变压器和开关管，该控制方法包括：基于变压器的副边侧的输出电压的互感电压调节第一电阻的阻值；利用第一电阻和第二电阻对该输出电压的反馈电压进行分压，生成反馈分压电压；将反馈分压电压与表征流过变压器的原边侧的输入电流的电流感测电压进行比较，生成关断控制信号；以及基于关断控制信号，控制开关管的关断。According to a control method of a power conversion system according to an embodiment of the present invention, the power conversion system includes a transformer and a switch tube, and the control method includes: adjusting the resistance value of the first resistor based on the mutual inductance voltage of the output voltage on the secondary side of the transformer; A resistor and a second resistor divide the feedback voltage of the output voltage to generate a feedback divided voltage; compare the feedback divided voltage with the current sensing voltage representing the input current flowing through the primary side of the transformer to generate a an off control signal; and based on the off control signal, the switch tube is controlled to be turned off.
根据本发明实施例的电源转换系统及其控制方法基于互感电压调节系统增益，使得系统效率在不同等级的输出电压时均能达到最佳。The power conversion system and the control method thereof according to the embodiments of the present invention adjust the system gain based on the mutual inductance voltage, so that the system efficiency can be optimal at different levels of output voltage.
附图说明Description of drawings
通过阅读以下参照附图对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更明显，其中，相同或相似的附图标记表示相同或相似的特征。Other features, objects and advantages of the present invention will become more apparent upon reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar features.
图1示出了传统的反激式电源转换系统的工作原理示意图；Figure 1 shows a schematic diagram of the working principle of a traditional flyback power conversion system;
图2示出了图1所示的反激式电源转换系统在输出电压满载的情况下的输出电压与系统频率的关系；FIG. 2 shows the relationship between the output voltage and the system frequency of the flyback power conversion system shown in FIG. 1 when the output voltage is fully loaded;
图3示出了根据本发明实施例的电源转换系统的工作原理示意图；FIG. 3 shows a schematic diagram of the working principle of a power conversion system according to an embodiment of the present invention;
图4示出了图3所示的互感电压取样网络和检测单元的示例性电路图；FIG. 4 shows an exemplary circuit diagram of the mutual inductance voltage sampling network and detection unit shown in FIG. 3;
图5示出了图3所示的互感电压取样网络和检测单元的另一示例性电路图；Fig. 5 shows another exemplary circuit diagram of the mutual inductance voltage sampling network and detection unit shown in Fig. 3;
图6示出了图3所示的电源转换系统的系统增益与互感电压的感测电流经电流取样后得到的采样电流之间的关系；FIG. 6 shows the relationship between the system gain of the power conversion system shown in FIG. 3 and the sampling current obtained after the sensing current of the mutual inductance voltage is sampled by the current;
图7示出了图3所示的电源转换系统的系统增益与互感电压的感测电压经电阻分压后得到的采样电压之间的关系。FIG. 7 shows the relationship between the system gain of the power conversion system shown in FIG. 3 and the sampling voltage obtained after the sensing voltage of the mutual inductance voltage is divided by resistors.
具体实施方式Detailed ways
下面将详细描述本发明的各个方面的特征和示例性实施例。在下面的详细描述中，提出了许多具体细节，以便提供对本发明的全面理解。但是，对于本领域技术人员来说很明显的是，本发明可以在不需要这些具体细节中的一些细节的情况下实施。下面对实施例的描述仅仅是为了通过示出本发明的示例来提供对本发明的更好的理解。本发明决不限于下面所提出的任何具体配置和算法，而是在不脱离本发明的精神的前提下覆盖了元素、部件和算法的任何修改、替换和改进。在附图和下面的描述中，没有示出公知的结构和技术，以便避免对本发明造成不必要的模糊。Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the invention. The present invention is in no way limited to any specific configurations and algorithms set forth below, but covers any modification, substitution and improvement of elements, components and algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present invention.
此外，所描述的特征、结构或特性可以以任何合适的方式结合在一个或更多实施例中。在下面的描述中，提供许多具体细节从而给出对本发明的实施例的充分理解。然而，本领域技术人员将意识到，可以实践本发明的技术方案而没有所述特定细节中的一个或更多，或者可以采用其它的方法、组元、材料等。在其它情况下，不详细示出或描述公知结构、材料或者操作以避免模糊本发明的主要技术创意。Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present invention. However, one skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or with other methods, components, materials, etc. being employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the main technical idea of the present invention.
图1示出了传统的反激式电源转换系统的工作原理示意图。如图1所示，该反激式电源转换系统包括整流器、变压器T1、开关管Q1、电流感测电阻Rs、误差放大器、光耦合器、以及控制器，其中：整流器对交流输入电压VAC进行整流，生成经整流的输入电压Vin(下面简称为输入电压Vin)；变压器T1将其原边侧的输入电压Vin变换成其副边侧的输出电压Vout，并将输出电压Vout提供给设备1至设备n；变压器T1﹑开关管Q1、以及电流感测电阻Rs基于输入电压Vin生成输入电流IL；输入电流IL在电流感测电阻Rs上生成电流感测电压VCS，该电流感测电压VCS被提供给控制器；误差放大器和光耦合器基于输出电压Vout生成反馈电压VFB，并将反馈电压VFB提供给控制器；控制器基于反馈电压VFB和电流感测电压VCS控制开关管Q1的导通与关断。Figure 1 shows a schematic diagram of the working principle of a conventional flyback power conversion system. As shown in Figure 1, the flyback power conversion system includes a rectifier, a transformer T1, a switch tube Q1, a current sensing resistor Rs, an error amplifier, an optocoupler, and a controller, wherein: therectifier performs a Rectify to generate a rectified input voltage Vin (hereinafter referred to as input voltage Vin); the transformer T1 converts the input voltage Vin on its primary side into an output voltage Vout on its secondary side, and provides the output voltage Vout to the device 1 to Device n; the transformer T1, the switch tube Q1, and the current sensing resistor Rs generate an input currentIL based on the input voltage Vin; the input currentIL generates a current sensing voltage VCS on the current sensing resistor Rs, and the current sensing voltage VCS is provided to the controller; the error amplifier and optocoupler generate a feedback voltage VFB based on the output voltage Vout and provide the feedback voltage VFB to the controller; the controller controls the switches based on the feedback voltage VFB and the current sense voltage VCS The turn-on and turn-off of the tube Q1.
在图1所示的控制器中，二极管D1将反馈电压VFB变换为反馈表征电压fbd，并将反馈表征电压fbd提供给振荡器；电阻Rdivd1和Rdivd2对反馈表征电压fbd进行分压生成反馈分压电压fb_div，并将反馈分压电压fb_div提供给比较器的正相输入端；电流感测电压VCS被提供给比较器的负相输入端；振荡器基于反馈表征电压fbd生成导通控制信号clk，并将导通控制信号clk提供给核心逻辑单元；比较器基于反馈分压电压fb_div和电流感测电压VCS生成截止控制信号off，并将截止控制信号off提供给核心逻辑单元；核心逻辑单元基于导通控制信号clk和截止控制信号off生成驱动开关管Q1的导通与关断的脉宽调制(PWM)信号，即驱动信号。In the controller shown in Figure 1, the diode D1 converts the feedback voltage VFB into the feedback characteristic voltage fbd, and provides the feedback characteristic voltage fbd to the oscillator; the resistors Rdivd1 and Rdivd2 divide the feedback characteristic voltage fbd to generate a feedback division voltage fb_div, and the feedback divided voltage fb_div is provided to the non-inverting input terminal of the comparator; the current sensing voltage VCS is provided to the negative-phase input terminal of the comparator; the oscillator generates a conduction control signal based on the feedback characterization voltage fbd clk, and provide the turn-on control signal clk to the core logic unit; the comparator generates the cut-off control signal off based on the feedback divided voltage fb_div and the current sensing voltage VCS , and provides the cut-off control signal off to the core logic unit; the core logic The unit generates a pulse width modulation (PWM) signal, that is, a drive signal, that drives the switch transistor Q1 to be turned on and off based on the turn-on control signal clk and the turn-off control signal off.
图1所示的反激式电源转换系统的系统增益K1和系统频率Fsw分别由以下等式得出：The system gain K1 and the system frequency Fsw of the flyback power conversion system shown in Figure 1 are respectively derived from the following equations:
其中，Iout是变压器T1的副边侧的输出电流，Ton是开关管Q1处于导通状态的持续时间，Lm是变压器T1的感量。in, Iout is the output current of the secondary side of the transformer T1, Ton is the duration that the switch tube Q1 is in a conducting state, and Lm is the inductance of the transformer T1.
图2示出了图1所示的反激式电源转换系统在输出电压满载的情况下的输出电压与系统频率的关系。如图2所示，在图1所示的反激式电源转换系统的输出电压满载的情况下，输出电压越高，系统频率越高，此时对应的系统效率也越高；输出电压越低，系统频率越低，此时对应的系统效率也越低。具体地，在图1所示的反激式电源转换系统的输出电压Vout为V1时，其系统频率较高，此时对应的系统效率也很高；在图1所示的反激式电源转换系统的输出电压Vout为V4时，由于其系统增益为固定增益K1，假定输出电流保持不变，则可以得出此时的系统频率比较低，仅为输出电压Vout为V1时的几分之一。FIG. 2 shows the relationship between the output voltage and the system frequency of the flyback power conversion system shown in FIG. 1 when the output voltage is fully loaded. As shown in Figure 2, when the output voltage of the flyback power conversion system shown in Figure 1 is fully loaded, the higher the output voltage, the higher the system frequency, and the higher the corresponding system efficiency at this time; the lower the output voltage , the lower the system frequency, the lower the corresponding system efficiency. Specifically, when the output voltage Vout of the flyback power conversion system shown in FIG. 1 is V1, the system frequency is high, and the corresponding system efficiency is also high at this time; in the flyback power conversion shown in FIG. 1 When the output voltage Vout of the system is V4, since its system gain is a fixed gain K1, assuming that the output current remains unchanged, it can be concluded that the system frequency at this time is relatively low, which is only a fraction of the output voltage Vout when it is V1. .
鉴于以上所述的问题，本发明提供了一种新颖的电源转换系统及其控制方法。下面结合图3至图7，详细描述根据本发明实施例的电源转换系统及其控制方法。In view of the above-mentioned problems, the present invention provides a novel power conversion system and a control method thereof. The power conversion system and the control method thereof according to the embodiments of the present invention will be described in detail below with reference to FIGS. 3 to 7 .
图3示出了根据本发明实施例的电源转换系统的工作原理示意图。图3所示的电源转换系统的工作原理与图1所示的反激式电源转换系统基本相同，相对于图1所示的反激式电源转换系统的主要区别在于：变压器的辅助绕组基于输出电压Vout生成互感电压Vaux；互感电压取样网络基于互感电压Vaux生成互感电压的感测电流Iaux或感测电压VPRT；控制器中的检测单元基于互感电压的感测电流Iaux或感测电压VPRT调节可变电阻Rdvid1’的阻值，从而改变该电源转换系统的系统增益。FIG. 3 shows a schematic diagram of the working principle of a power conversion system according to an embodiment of the present invention. The working principle of the power conversion system shown in Figure 3 is basically the same as that of the flyback power conversion system shown in Figure 1. The main difference compared to the flyback power conversion system shown in Figure 1 is that the auxiliary winding of the transformer is based on the output The voltage Vout generates the mutual inductance voltage Vaux; the mutual inductance voltage sampling network generates the sensed current Iaux or the sensed voltageVPRT of the mutual inductance voltage based on the mutual inductance voltage Vaux; the detection unit in the controller is based on the sensed current Iaux of the mutual inductance voltage or the sensed voltageVPRT . Adjust the resistance value of the variable resistor Rdvid1', thereby changing the system gain of the power conversion system.
具体地，在图3所示的电源转换系统中，变压器T1的辅组绕组通过与变压器T1的副边绕组互感耦合，生成与输出电压Vout成正比的互感电压Vaux；互感电压取样网络基于互感电压Vaux生成互感电压的感测电流Iaux或感测电压VPRT；控制器内部的检测单元通过对互感电压的感测电流Iaux或感测电压VPRT进行采样生成采样电流Isample或采样电压Vsample，将采样电流Isample与预设的多个电流阈值Ith1～Ithn(n是大于0的整数)进行比较或将采样电压Vsample与预设的多个电压阈值Vth1～Vthn进行比较，并且基于比较结果来调节可变电阻Rdvid1’的阻值，从而使该电源转换系统在不同输出电压下具有不同的系统增益K1～Kn。Specifically, in the power conversion system shown in FIG. 3 , the auxiliary winding of the transformer T1 is coupled with the secondary winding of the transformer T1 through mutual inductance to generate a mutual inductance voltage Vaux proportional to the output voltage Vout; the mutual inductance voltage sampling network is based on the mutual inductance voltage. Vaux generates the sensing current Iaux of the mutual inductance voltage or the sensing voltageVPRT ; the detection unit inside the controller generates the sampling current Isample or the sampling voltageVsample by sampling the sensing current Iaux or the sensing voltage VPRT of the mutual inductance voltage, and the sampling The current Isample is compared with a plurality of preset current thresholds Ith1-Ithn (n is an integer greater than 0) or the sampled voltage Vsample is compared with a plurality of preset voltage thresholds Vth1-Vthn, and the variable is adjusted based on the comparison results. The resistance value of the resistor Rdvid1' makes the power conversion system have different system gains K1-Kn under different output voltages.
图3所示的电源转换系统的系统增益这里，由于电阻Rdivd1’的阻值随着互感电压的感测电流Iaux或感测电压VPRT的变化而变化，因此可以在不同输出电压下实现不同的系统增益K1～Kn。The system gain of the power conversion system shown in Figure 3 Here, since the resistance value of the resistor Rdivd1 ′ changes with the change of the sensing current Iaux of the mutual inductance voltage or the sensing voltageVPRT , different system gains K1 ˜Kn can be realized under different output voltages.
图4示出了图3所示的互感电压取样网络和检测单元的示例性电路图。如图4所示，互感电压取样网络包括电阻R1、二极管D3、以及热敏电阻M1，即互感电压取样网络可以被实现为由电阻R1、二极管D3、以及热敏电阻M1组成的电阻取样网络的形式，互感电压的感测电流Iaux是通过对互感电压Vaux进行电阻取样得到的；检测单元包括电流采样单元、数据选择器、以及n个电流比较器。在这种情况下，电流采样单元通过对互感电压的感测电流Iaux进行采样生成采样电流Isample，n个电流比较器将采样电流Isample与预设的多个电流阈值Ith1～Ithn进行比较，数据选择器基于n个电流比较器的比较结果来调节可变电阻Rdvid1’的阻值。FIG. 4 shows an exemplary circuit diagram of the mutual inductance voltage sampling network and the detection unit shown in FIG. 3 . As shown in Figure 4, the mutual inductance voltage sampling network includes a resistor R1, a diode D3, and a thermistor M1, that is, the mutual inductance voltage sampling network can be implemented as a resistance sampling network composed of a resistor R1, a diode D3, and the thermistor M1. In the form, the sensing current Iaux of the mutual inductance voltage is obtained by resistance sampling the mutual inductance voltage Vaux; the detection unit includes a current sampling unit, a data selector, and n current comparators. In this case, the current sampling unit generates the sampling current Isample by sampling the sensing current Iaux of the mutual inductance voltage, and the n current comparators compare the sampling current Isample with a plurality of preset current thresholds Ith1-Ithn, and the data selects The controller adjusts the resistance value of the variable resistor Rdvid1' based on the comparison results of the n current comparators.
在图4所示的互感电压取样网络的情况下，互感电压的感测电流Iaux可以通过等式1计算得出：In the case of the mutual inductance voltage sampling network shown in Figure 4, the sensed current Iaux of the mutual inductance voltage can be calculated by Equation 1:
其中，Naux是变压器T1的辅组绕组的匝数，Ns是变压器T1的副边绕组的匝数。Among them, Naux is the number of turns of the auxiliary winding of the transformer T1, and Ns is the number of turns of the secondary winding of the transformer T1.
除了如图4所示的互感电压取样网络的实现方式以外，互感电压取样网络也可以被实现为图5所示的形式。图5示出了图3所示的互感电压取样网络和检测单元的另一示例性电路图。如图5所示，互感电压取样网络包括电阻R1和电阻R2，即互感电压取样网络可以被实现为由电阻R1和电阻R2组成的电阻分压网络的形式，互感电压的感测电压VPRT是通过对互感电压Vaux进行分压得到的；检测单元包括电压采样单元、数据选择器、以及n个电压比较器。在这种情况下，电压采样单元通过对互感电压的感测电压VPRT进行采样生成采样电压Vsample，n个电压比较器将采样电压Vsample与预设的多个电压阈值Vth1～Vthn进行比较，数据选择器基于n个电压比较器的比较结果来调节可变电阻Rdvid1’的阻值。In addition to the implementation of the mutual inductance voltage sampling network shown in FIG. 4 , the mutual inductance voltage sampling network can also be implemented in the form shown in FIG. 5 . FIG. 5 shows another exemplary circuit diagram of the mutual inductance voltage sampling network and detection unit shown in FIG. 3 . As shown in Figure 5, the mutual inductance voltage sampling network includes resistors R1 and R2, that is, the mutual inductance voltage sampling network can be implemented in the form of a resistor divider network composed of resistors R1 and R2, and the sensing voltage VPRT of the mutual inductance voltage is It is obtained by dividing the mutual inductance voltage Vaux; the detection unit includes a voltage sampling unit, a data selector, and n voltage comparators. In this case, the voltage sampling unit generates the sampling voltage Vsample by sampling the sensing voltage VPRT of the mutual inductance voltage, and the n voltage comparators The selector adjusts the resistance value of the variable resistor Rdvid1' based on the comparison results of the n voltage comparators.
在图5所示的互感电压取样网络的情况下，互感电压的感测电压VPRT可以通过等式2计算得出：In the case of the mutual inductance voltage sampling network shown in Figure 5, the sensed voltage VPRT of the mutual inductance voltage can be calculated by Equation 2:
通过等式1和等式2可以看出，互感电压的感测电流Iaux和感测电压VPRT均与输出电压Vout成正比，所以都可以表征输出电压Vout。It can be seen from Equation 1 and Equation 2 that the sensing current Iaux of the mutual inductance voltage and the sensing voltage VPRT are both proportional to the output voltage Vout, so both can characterize the output voltage Vout.
图6示出了图3所示的电源转换系统的系统增益与互感电压的感测电流经电流取样后所得的采样电流之间的关系。如图6所示，当检测单元检测到Isample<Ith1时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为K1；当检测单元检测到Ith2>Isample>Ith1时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为K2；当检测单元检测到Ith3>Isample>Ith2时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为K3；当检测单元检测到Ith4>Isample>Ith3时，通过调节Rdivd1’的阻值使得系统增益为K4；依次类推，当检测单元检测到Isample>Ithn时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为Kn。FIG. 6 shows the relationship between the system gain of the power conversion system shown in FIG. 3 and the sampling current obtained after the sensing current of the mutual inductance voltage is sampled. As shown in Figure 6, when the detection unit detects Isample<Ith1, the resistance of Rdivd1' is adjusted so that the gain of △VFB /△VCS is K1; when the detection unit detects Ith2>Isample>Ith1, by adjusting The resistance of Rdivd1' makes the gain of △VFB /△VCS to be K2; when the detection unit detects that Ith3>Isample>Ith2, adjust the resistance of Rdivd1' to make the gain of △VFB /△VCS to be K3; When the detection unit detects Ith4>Isample>Ith3, adjust the resistance of Rdivd1' to make the system gain K4; and so on, when the detection unit detects Isample>Ithn, adjust the resistance of Rdivd1' to make △VFB / The gain of ΔVCS is Kn.
图7示出了图3所示的电源转换系统的系统增益与互感电压的感测电压经电阻分压后得到的采样电压之间的关系。如图7所示，当检测单元检测到Vsample<Vth1时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为K1；当检测单元检测到Vth2>Vsample>Vth1时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为K2；当检测单元检测到Vth3>Vsample>Vth2时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为K3；当检测单元检测到Vth4>Vsample>Vth3时，通过调节Rdivd1’的阻值使得系统增益为K4；依次类推，当检测单元检测到Vsample>Vthn时，通过调节Rdivd1’的阻值使得△VFB/△VCS的增益为Kn。FIG. 7 shows the relationship between the system gain of the power conversion system shown in FIG. 3 and the sampling voltage obtained after the sensing voltage of the mutual inductance voltage is divided by resistors. As shown in Figure 7, when the detection unit detects Vsample<Vth1, the resistance of Rdivd1' is adjusted so that the gain of △VFB /△VCS is K1; when the detection unit detects Vth2>Vsample>Vth1, by adjusting The resistance of Rdivd1' makes the gain of △VFB /△VCS to be K2; when the detection unit detects that Vth3>Vsample>Vth2, adjust the resistance of Rdivd1' to make the gain of △VFB /△VCS to be K3; When the detection unit detects Vth4>Vsample>Vth3, adjust the resistance of Rdivd1' to make the system gain K4; and so on, when the detection unit detects Vsample>Vthn, adjust the resistance of Rdivd1' to make △VFB / The gain of ΔVCS is Kn.
结合图3至图7描述的电源转换系统，基于表征输出电压Vout的互感电压的感测电流Iaux或感测电压VPRT调节系统增益，使得系统效率在不同等级的输出电压时均能达到最佳，系统频率一致性很好，并且整个系统无论在高压高功率还是低压低功率应用时都能符合开关电源系统高能效的国际标准。相对于结合图1至图2描述的传统的反激式电源转换系统，根据本发明实施例的电源转换系统可以极大地提高系统效率，降低系统成本、增加系统适用范围。With reference to the power conversion system described in FIGS. 3 to 7 , the system gain is adjusted based on the sensing current Iaux or the sensing voltage VPRT representing the mutual inductance voltage of the output voltage Vout, so that the system efficiency can be optimal at different levels of output voltage. , the system frequency consistency is very good, and the entire system can meet the international standards for high energy efficiency of switching power supply systems in high-voltage high-power or low-voltage low-power applications. Compared with the conventional flyback power conversion system described in conjunction with FIG. 1 to FIG. 2 , the power conversion system according to the embodiment of the present invention can greatly improve system efficiency, reduce system cost, and increase system application scope.
需要说明的是，根据本发明实施例的电源转换系统不仅仅适用于目前主流的快充系统，也适用于非快充协议的、具有多级电压输出的开关电源系统。It should be noted that the power conversion system according to the embodiment of the present invention is not only applicable to the current mainstream fast charging system, but also applicable to the switching power supply system with multi-level voltage output which is not a fast charging protocol.
本发明可以以其他的具体形式实现，而不脱离其精神和本质特征。例如，特定实施例中所描述的算法可以被修改，而系统体系结构并不脱离本发明的基本精神。因此，当前的实施例在所有方面都被看作是示例性的而非限定性的，本发明的范围由所附权利要求而非上述描述定义，并且，落入权利要求的含义和等同物的范围内的全部改变从而都被包括在本发明的范围之中。The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in particular embodiments may be modified without departing from the basic spirit of the invention in system architecture. Accordingly, the present embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and falls within the meaning and equivalents of the claims. All changes within the scope are thus included in the scope of the invention.
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