WO2019015414A1 - 一种抖频控制电路及控制方法 - Google Patents

一种抖频控制电路及控制方法 Download PDF

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WO2019015414A1
WO2019015414A1 PCT/CN2018/090362 CN2018090362W WO2019015414A1 WO 2019015414 A1 WO2019015414 A1 WO 2019015414A1 CN 2018090362 W CN2018090362 W CN 2018090362W WO 2019015414 A1 WO2019015414 A1 WO 2019015414A1
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frequency
pin
chip
control circuit
jittering
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PCT/CN2018/090362
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English (en)
French (fr)
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唐盛斌
符威
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广州金升阳科技有限公司
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Publication of WO2019015414A1 publication Critical patent/WO2019015414A1/zh

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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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

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  • the present invention relates to the field of electromagnetic technology, and in particular, to a frequency hopping control circuit and a control method.
  • the frequency hopping technique reduces EMI by appropriately modulating the switching frequency so that the radiant energy is distributed over a wide frequency range, reducing the harmonic amplitude to smooth it.
  • frequency-hopping technology is not only advantageous but has no disadvantages.
  • applications such as low-power and small-volume applications, due to the small output capacitance, the use of frequency-hopping technology often brings unbearable output ripple;
  • the technical problem to be solved by the present invention is to provide a frequency-jitter control circuit that can be integrated and can be multiplexed with pins to achieve frequency-hopping, and allows the chip application engineer to add only or according to actual application requirements.
  • the selection of the frequency-hopping technique can be accomplished by reducing fewer peripheral components; accordingly, the present invention also provides a frequency-hopping control method employed by the above-described circuit.
  • a frequency-jittering control circuit is applied to a switching power supply control chip, which comprises: a detection pin, a detection module, an enable module and an enable signal output terminal connected in sequence; a detection pin multiplexing switching power supply control chip One of the pins, the detection module charges the pin, detects the pin to obtain a voltage signal, and then sends the voltage signal to the enable module; the enable module determines whether the pin is externally connected to the capacitor according to the received voltage signal. Then, an enable signal of whether or not the frequency-jitter function is added is output through the enable signal output terminal.
  • the enabling module determines whether the detecting pin is externally connected by comparing the voltage signal with the preset voltage within a specified time.
  • the specified time is the moment when the chip is started or the power tube is turned on every cycle.
  • the sense pin is a frequency setting function pin of the chip.
  • a frequency-jittering control method for controlling whether a switching power supply control chip adds a frequency-jittering function comprises: detecting one of the pins of the control chip to obtain a voltage signal; determining, according to the voltage signal, the Whether the pin is externally connected to the capacitor; whether the output is added to the enable signal of the frequency-hopping function.
  • the voltage signal is compared with the preset voltage within a specified time to determine whether the pin is externally connected to the capacitor.
  • the specified time is the moment when the chip is started or the power tube is turned on every cycle.
  • the pin is a frequency setting function pin.
  • the chip Design companies also do not need to design two types of chips separately, while reducing the line maintenance costs and design costs of chip application companies and design companies.
  • FIG. 1 is a circuit block diagram of a frequency-jitter control circuit 100 according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of an application circuit of the chip 10 in which the frequency-jitter control circuit 100 of Embodiment 1 of the present invention is integrated.
  • the frequency-jittering control circuit 100 includes a detection pin 3, a detection module 110, an enable module 120, and an enable signal EN output terminal, which are sequentially connected, one end of the detection module 110, and a frequency setting pin of the chip 10.
  • the RI pin is connected, that is, the frequency setting pin of the detection pin 3 multiplexed switching power supply control chip is RI, and the other end of the detecting module 110 is connected with one end of the enabling module 120 to form a node of the RI pin sampling voltage Vs;
  • the other end of the module 120 is coupled to the frequency hopping module 200 of the chip 10 to form a node that outputs an enable signal EN, even if the signal EN output is available.
  • the names with the same English code in the following have the same meaning.
  • the detecting module 110 starts detecting the voltage of the RI pin, and generates a sampling voltage Vs to be sent to the enabling module 120.
  • the enabling module 120 compares the received sampling voltage Vs with the preset voltage V1. If the sampling voltage Vs is less than the preset voltage V1, the enable signal EN is issued to enable the frequency hopping module 200 to add the frequency hopping function to the system.
  • whether or not to add the frequency-hopping function can be achieved by adding or not adding a capacitor C1 to the RI pin, that is, adding a capacitor C1 to the RI pin, the slope of the RI pin voltage rise is reduced.
  • the sampling voltage Vs will be less than the preset voltage V1, and the system will add the frequency-hopping function; otherwise, it will not be added. Because the 2us time is very short, so through a reasonable design, only a small low-voltage capacitor (nF level) can choose whether to add the frequency-hopping function, the system circuit is simple.
  • the application engineer can complete the capacitor C1 without adding a capacitor. Design; while in some applications where the output capacitor is large enough and the EMI requirements are high, and the frequency hopping can be used to reduce EMI, the capacitor C1 can be used to complete the design. In this way, application engineers do not need to use two different types of chips according to application requirements.
  • the chip design company does not need to design two types of chips separately, and reduces the maintenance cost and design cost of chip application companies and design companies. At the same time, pin multiplexing can be achieved, reducing the cost of chip packaging and the like.
  • FIG. 2 is a schematic diagram of an application circuit of a chip 10 integrating a frequency-shock control circuit 100 provided by the present invention.
  • the circuit uses a low-cost small-volume DC-DC flyback converter scheme, and the main power topology is a well-known technology.
  • FIG. 1 As shown in FIG.
  • the chip 10 is powered from the input voltage V DC through the VIN pin, and then the bypass capacitor C BP of the VCC pin is charged until the chip 10 is started.
  • the current flowing through the VIN pin becomes the chip 10 Normal operating current, that is, the VIN pin continuously draws power from the input voltage to maintain normal operation of the chip;
  • the VFB pin is the feedback pin of the chip 10 for receiving the feedback signal of the optocoupler;
  • the VSS pin is the reference ground of the chip 10;
  • DRN The pin is the drain of the built-in power tube of the chip, and is used to connect with one end of the transformer to realize the energy conversion of the switching power supply;
  • RI is the frequency setting pin of the chip 10, and the external resistor R1 needs to be connected to the reference ground to set the switching frequency.
  • the scale is mirrored to the RC oscillator inside the chip 10 as the bias current of the RC oscillator to set the chip frequency.
  • the external capacitor C1 on the RI pin only lengthens the time when the RI pin voltage rises to V ref , and does not affect the original pin function of the frequency setting. Therefore, the pin multiplexing of the frequency-hopping selection function and the frequency setting function can be perfectly realized by using the control scheme of Embodiment 1.
  • the circuit block diagram and application circuit configuration of the frequency-jitter control circuit of the second embodiment are identical to those of the first embodiment.
  • the difference between the two is that the preset condition of the second embodiment is that the sampling voltage Vs is greater than the preset voltage V1.
  • the enable signal EN is issued.
  • the frequency hopping module 200 is enabled to add the frequency hopping function to the system.
  • the system does not add the capacitor C1, and the system adds the frequency-hopping function; when the capacitor C1 is added, the system does not add the frequency-hopping function.
  • the above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and refinements, such as a specific moment, as a chip start without departing from the principles of the present invention.
  • the specific time period is set as the preset time period from the start of the chip or during the power tube open period of each cycle, the specific pin is set to other function pins, the specific state For other states such as current, changing preset conditions, etc., should also be considered as protection scope of the present invention.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

一种抖频控制电路（100），包括检测模块（110）和使能模块（120），抖频控制电路通过检测引脚（3）状态，决定是否加入抖频功能。该控制电路结构简单，降低了应用工程师的设计难度，简化了设计步骤。

Description

一种抖频控制电路及控制方法 技术领域
本发明涉及电磁技术领域，特别涉及一种抖频控制电路及控制方法。
背景技术
现在，越来越多开关电源厂商使用抖频技术来减少电磁干扰(EMI)。抖频技术通过适当地调制开关频率，使辐射能量分布在较宽的频率范围内，降低谐波幅值使其变得平滑，从而降低EMI。
然而抖频技术并非只有优点没有缺点，在一些应用环境中，例如在低功率小体积的应用中，由于输出电容很小，采用抖频技术常常会带来难以忍受的输出纹波；还有在一些通信电源标准中，明确要求不可以采用抖频技术，因此在此类应用中往往会舍弃那些集成了抖频技术的芯片，而采用普通芯片进行PWM控制，这就限制了集成抖频功能的芯片的应用范围。
在现有技术的基础上，为了满足需要抖频和不需要抖频的两种应用需求，芯片设计者不得不单独设计两类芯片，或者增加额外的引脚作为抖频的使能引脚，这样做无疑又增加了芯片设计厂商的设计与制造成本；而对于芯片应用厂商来说，为了满足上述两种不同的应用需求，他们不得不使用两类芯片分别开发两类不同的方案，增加应用厂商的产品设计与产品管理的成本，或者单独为多出来的使能引脚设计外围使能电路，这种外围使能电路往往较复杂，这样又会增加设计难度和PCB布线面积。
发明内容
有鉴如此，本发明要解决的技术问题是提供一种抖频控制电路，可集成且既能复用引脚实现抖频的使能，又能让芯片应用工程师根据实际应用需求，只增加或减少较少的外围元件就能完成是否加入抖频技术的选择；相应地，本发明还提供一种上述电路所采用的抖频控制方法。
本发明解决上述第一个技术问题的技术方案是：
一种抖频控制电路，应用于开关电源控制芯片，其特征在于：包括顺次连接的检测引脚、检测模块、使能模块和使能信号输出端；检测引脚复用开关电源控制芯片的引脚之一，检测模块给引脚充电，并检测该引脚获得电压信号，然后将电压信号发送给使能模块；使能模块根据接收到的电压信号，判断该引 脚是否外接了电容，然后通过使能信号输出端输出是否加入抖频功能的使能信号。
优选地，使能模块通过在指定时间内，将电压信号与预设电压做对比，判断检测引脚是否外接了电容
优选地，指定时间为芯片启动瞬间或每周期功率管开启瞬间。
优选地，检测引脚为芯片的频率设置功能引脚。
本发明解决上述第二个技术问题的技术方案是：
一种抖频控制方法，用于开关电源控制芯片是否加入抖频功能的控制，其特征在于所述的控制方法包括：检测控制芯片引脚之一获得电压信号；依据该电压信号，判断所述的引脚是否外接了电容；输出是否加入抖频功能的使能信号。
优选地，在指定时间内，将电压信号与预设电压做对比，判断所述的引脚是否外接了电容。
优选地，指定时间为芯片启动瞬间或每周期功率管开启瞬间。
优选地，所述的引脚为频率设置功能引脚。
以上对本发明的电路和方法各技术方案及技术特征的原理、作用等进行了分析，现将本发明的有益效果总结如下：
1、在设计抖频控制电路时，只要合理设计所述的特定时刻，处理好引脚已有功能与抖频判定的工作时序问题，就可以实现引脚复用，为芯片节省引脚，给芯片设计公司节约成本。
2、合理设计所述的特定状态和预设条件，可使应用工程师只需增加或减少一个外围元件就能选择是否加入抖频功能，而不需要根据应用需求使用两款不同类别的芯片，芯片设计公司也不需要单独设计两类芯片，同时降低了芯片应用公司和设计公司的产线维护成本和设计成本。
附图说明
图1为本发明实施例1的抖频控制电路100的电路框图；
图2为集成本发明实施例1的抖频控制电路100的芯片10的应用电路示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实 施例，对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例1
图1是本发明提供的一种抖频控制电路100的电路框图。如图1所示，抖频控制电路100包括顺次连接的检测引脚3、检测模块110、使能模块120和使能信号EN输出端，检测模块110的一端与芯片10的频率设置引脚即RI引脚连接，即检测引脚3复用开关电源控制芯片的频率设置引脚即RI，检测模块110另一端与使能模块120的一端连接形成RI引脚采样电压Vs的节点；使能模块120的另一端与芯片10的抖频模块200连接，形成输出使能信号EN的节点，即使能信号EN输出端。在下文中具有相同英文代号的名称的含义相同。
在芯片10启动起计时2us后，检测模块110开始检测RI引脚的电压，生成采样电压Vs发送给使能模块120；使能模块120将接收到的采样电压Vs与预设电压V1作比较，若采样电压Vs小于预设电压V1，则发出使能信号EN，使能抖频模块200，将抖频功能加入系统中。显然，在本发明实施例1中，选择是否加入抖频功能可以通过在RI引脚加或不加电容C1来实现，即在RI引脚加电容C1，则RI引脚电压上升斜率会减小，那么在规定的2us后，采样电压Vs会小于预设电压V1，系统加入抖频功能；反之，则不加入。因为2us的时间很短，所以通过合理的设计，只需要一个较小的低压电容(nF级)就能选择是否加入抖频功能，系统电路简单。
采用了本发明的抖频控制方案后，在一些对体积和输出纹波要求高，EMI特性要求不高或产品标准明确要求不能使用抖频的应用中，应用工程师可以通过不加电容C1来完成设计；而在一些本身输出电容就足够大，EMI要求高，可以使用抖频降低EMI的应用中，可以通过加电容C1来完成设计。这样应用工程师就不需要根据应用需求使用两款不同类别的芯片，芯片设计公司也不需要单独设计两类芯片，同时降低了芯片应用公司和设计公司的产线维护成本和设计成本。与此同时，还能实现引脚复用，降低芯片的封装等成本。
图2是集成本发明提供的一种抖频控制电路100的芯片10的应用电路示意图，该电路应用的是低成本小体积的DC-DC反激变换器方案，主功率拓扑为公知技术，由9-36V输入的V DC、输出电压V out、电容C VIN、电容C ds、主功率变压器、 二极管D OUT、电容C 2、电感L 1、电容C 3、电阻R 2、电阻R 3、电阻R 4、电阻R 5、电阻R 6、电容C C、TL431等器件组成。如图2所示，芯片10通过VIN引脚从输入电压V DC取电，然后给VCC引脚的旁路电容C BP充电至芯片10启动后，流过VIN引脚的电流变为芯片10的正常工作电流，即VIN引脚持续从输入电压取电以维持芯片正常工作；VFB引脚为芯片10的反馈引脚，用于接收光耦的反馈信号；VSS引脚为芯片10参考地；DRN引脚是芯片内置功率管的漏极，用于与变压器的一端连接，实现开关电源的能量转换；RI为芯片10的频率设置引脚，需要外接电阻R1到参考地来设定开关频率，具体设置方法为芯片10内部基准电压V ref经过一个电压跟随器将RI引脚的电压钳位为V ref，使得流过电阻R1的电流I R1＝V ref/R1，然后芯片10将电流I R1按比例镜像给芯片10内部的RC振荡器，作为RC振荡器的偏置电流以设置芯片频率。
综上所述，在RI引脚外挂电容C1，只会加长RI引脚电压上升到V ref的时间，并不会影响频率设置的原引脚功能。因此使用实施例1的控制方案可以完美实现抖频选择功能和频率设置功能的引脚复用。
实施例2
实施例2的抖频控制电路的电路框图和应用电路结构与实施例1完全相同。两者的不同点在于，实施例2的预设条件为，采样电压Vs大于预设电压V1，即在实施例2中，若生成的采样信号Vs大于预设电压V1，则发出使能信号EN，使能抖频模块200，将抖频功能加入系统中。
因此在实施例2中，不加电容C1，系统加入抖频功能；加电容C1，系统不加入抖频功能。
以上所述是本发明的优先实施例，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，做出的若干改进和润饰，如特定时刻设为芯片启动起的预设时间后或每周期功率管开启时刻，特定时间段设为芯片启动起的预设时间段内或每周期功率管开启时段内，特定引脚设定为其他功能引脚，特定状态为电流等其他状态，更改预设条件等等，也应视为本发明的保护范围。

Claims (8)

  1. 一种抖频控制电路，应用于开关电源控制芯片，其特征在于：包括顺次连接的检测引脚、检测模块、使能模块和使能信号输出端；检测引脚复用开关电源控制芯片的引脚之一，检测模块给引脚充电，并检测该引脚获得电压信号，然后将电压信号发送给使能模块；使能模块根据接收到的电压信号，判断该引脚是否外接了电容，然后通过使能信号输出端输出是否加入抖频功能的使能信号。
  2. 根据权利要求1所述的抖频控制电路，其特征在于：使能模块通过在指定时间内，将电压信号与预设电压做对比，判断检测引脚是否外接了电容。
  3. 根据权利要求2所述的抖频控制电路，其特征在于：指定时间为芯片启动瞬间或每周期功率管开启瞬间。
  4. 根据权利要求1所述的抖频控制电路，其特征在于：检测引脚为芯片的频率设置功能引脚。
  5. 一种抖频控制方法，用于开关电源控制芯片是否加入抖频功能的控制，其特征在于所述的控制方法包括：检测控制芯片引脚之一获得电压信号；依据该电压信号，判断所述的引脚是否外接了电容；输出是否加入抖频功能的使能信号。
  6. 根据权利要求5所述的抖频控制方法，其特征在于：在指定时间内，将电压信号与预设电压做对比，判断所述的引脚是否外接了电容。
  7. 根据权利要求6所述的抖频控制方法，其特征在于：指定时间为芯片启动瞬间或每周期功率管开启瞬间。
  8. 根据权利要求5所述的抖频控制方法，其特征在于：所述的引脚为频率设置功能引脚。
PCT/CN2018/090362 2017-07-18 2018-06-08 一种抖频控制电路及控制方法 WO2019015414A1 (zh)

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