TWM499008U - Switch power supply circuit with adjustable output voltage - Google Patents

Switch power supply circuit with adjustable output voltage Download PDF

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Publication number
TWM499008U
TWM499008U TW103211836U TW103211836U TWM499008U TW M499008 U TWM499008 U TW M499008U TW 103211836 U TW103211836 U TW 103211836U TW 103211836 U TW103211836 U TW 103211836U TW M499008 U TWM499008 U TW M499008U
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Taiwan
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circuit
power supply
output
input end
switching power
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TW103211836U
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Chinese (zh)
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chang-shan Zhang
lie-yi Fang
Zhi-Qiang Sun
xiu-hong Zhang
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On Bright Electronics Shanghai
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Description

輸出電壓可調式開關電源電路Output voltage adjustable switching power supply circuit

本創作涉及電路領域，更具體地涉及一種具備支持接收多種不同的通信指令並且輸出電壓可調節的特徵的開關電源電路。The present invention relates to the field of circuits, and more particularly to a switching power supply circuit having features that support receiving a plurality of different communication commands and having an adjustable output voltage.

目前，市場上慣常設計的開關電源充電器僅相容一種通信協議，從而只能為一種相同類型的可攜式設備充電。作為示例，第1圖示出了現有技術中僅支援一種協定方案的開關電源系統的示例性框圖。如第1圖所述，在僅支援一種協定方案(例如諸如電流信號的A類通信指令)的開關電源系統中，A類可攜式設備100通過其主控晶片101向開關電源200發送A類通信指令，開關電源200中的解碼晶片201解碼指令後通過功率控制模組202對輸出功率進行控制，從而向該可攜式裝置的負載模組102提供具備可調性的電能。然而由於指令的不相容，該開關電源200無法向A類可攜式設備100之外的其它可攜式裝置提供輸出調節的功能。Currently, switching power supply chargers that are customarily designed on the market are only compatible with one communication protocol, so that only one portable device of the same type can be charged. As an example, FIG. 1 shows an exemplary block diagram of a prior art switching power supply system that supports only one protocol scheme. As described in FIG. 1, in a switching power supply system that supports only one protocol scheme (for example, a class A communication command such as a current signal), the class A portable device 100 transmits a class A to the switching power supply 200 through its master wafer 101. The communication command, the decoding chip 201 in the switching power supply 200 decodes the command, and then controls the output power through the power control module 202 to provide the adjustable power to the load module 102 of the portable device. However, due to the incompatibility of the instructions, the switching power supply 200 is unable to provide an output adjustment function to other portable devices other than the Class A portable device 100.

作為另一示例，第2圖示出了現有技術中僅支援一種協定方案的副邊控制開關電源快充電路的示例性圖示。如第2圖所示，B類可攜式設備僅支援一種協定方案(例如諸如電壓信號的B類通信指令)，通過僅支援B類通信指令的接收器向開關電源的控制電路提供指令，從而控制供電電路對該可攜式設備充電。同樣，該開關電源無法向B類可攜式設備之外的其它可攜式裝置提供輸出調節的功能。As another example, FIG. 2 illustrates an exemplary illustration of a secondary side control switching power supply fast charging path that only supports one protocol scheme in the prior art. As shown in Figure 2, the Class B portable device only supports one protocol scheme (such as a Class B communication command such as a voltage signal), and provides instructions to the control circuit of the switching power supply through a receiver that only supports the Class B communication command. The power supply circuit is controlled to charge the portable device. Similarly, the switching power supply is not capable of providing output regulation to other portable devices other than Class B portable devices.

而當給不同的可攜式設備進行充電時，由於可攜式設備所發的通信指令不同，往往需要更換不同的電源充電器給其充電。顯然，這給操作者的操作帶來了極大的麻煩。When charging different portable devices, because the communication commands sent by the portable devices are different, it is often necessary to replace the different power chargers to charge them. Obviously, this brings great trouble to the operator's operation.

因此，迫切需要一種能夠相容不同通信協定(指令)、且輸出電壓靈活可調的開關電源電路。Therefore, there is an urgent need for a switching power supply circuit that is compatible with different communication protocols (instructions) and whose output voltage is flexibly adjustable.

至少為了解決以上技術難點，本創作提供了一種設計和製造成本低，電路結構簡單，相容性好的輸出電壓電流可調的開關電源電路。At least in order to solve the above technical difficulties, the present invention provides a switching power supply circuit with low design and manufacturing cost, simple circuit structure and good compatibility of output voltage and current.

根據本創作的開關電源電路，包括AC輸入整流和EMI濾波電路、反激開關電路、控制電路、供電電路、輸出整流濾波電路、回饋取樣電路、過沖吸收電路、指令協定接收編碼電路以及指令傳輸電路，其中：AC輸入整流和EMI濾波電路的輸入端與交流電源相連接，輸出端與供電電路的輸入端相連接；反激開關電路的輸入端與控制電路的輸出端和過沖吸收電路的輸出端相連接，輸出端與輸出整流濾波電路的輸入端相連接；控制電路的輸入端與供電電路的輸出端、回饋取樣電路的輸入端相連接，輸出端與反激開關電路的輸入端、指令協定接收編碼電路的輸入端以及指令傳輸電路的輸入端相連接；供電電路的輸入端與AC輸入整流和EMI濾波電路的輸出端相連接，輸出端與回饋取樣電路的輸入端以及控制電路的輸入端相連接；輸出整流濾波電路的輸入端與反激開關電路的輸出端相連接，輸出端與負載以及指令協定接收編碼電路的輸入端相連接；回饋取樣電路的輸入端與供電電路的輸出端、控制電路的輸入端相連接，輸出端與過沖吸收電路的輸入端相連接；過沖吸收電路的輸入端與回饋取樣電路的輸出端相連接，輸出端與反激開關電路的輸入端相連接；指令協定接收編碼電路的輸入端與控制電路的輸出端、輸出整流濾波電路的輸出端以及指令傳輸電路的輸出端相連接，輸出端與負載相連接；並且指令傳輸電路的輸入端與控制電路的輸出端相連接，輸出端與輸出整流濾波電路的輸入端、指令協定接收編碼電路的輸入端相連接。The switching power supply circuit according to the present invention includes an AC input rectification and EMI filter circuit, a flyback switch circuit, a control circuit, a power supply circuit, an output rectification filter circuit, a feedback sampling circuit, an overshoot absorption circuit, an instruction protocol receiving coding circuit, and an instruction transmission. a circuit, wherein: an input of the AC input rectification and EMI filter circuit is connected to an AC power source, and an output end is connected to an input end of the power supply circuit; an input end of the flyback switch circuit and an output end of the control circuit and an overshoot absorption circuit The output end is connected, the output end is connected with the input end of the output rectification filter circuit; the input end of the control circuit is connected with the output end of the power supply circuit, the input end of the feedback sampling circuit, the output end and the input end of the flyback switch circuit, The input end of the instruction protocol receiving coding circuit and the input end of the instruction transmission circuit are connected; the input end of the power supply circuit is connected with the output end of the AC input rectification and EMI filter circuit, the output end and the input end of the feedback sampling circuit and the control circuit The input terminal is connected; the input end of the output rectification and filtering circuit is electrically connected to the flyback switch The output end is connected, the output end is connected with the load and the input end of the command agreement receiving coding circuit; the input end of the feedback sampling circuit is connected with the output end of the power supply circuit, the input end of the control circuit, the output end and the overshoot absorption circuit The input end is connected; the input end of the overshoot absorption circuit is connected to the output end of the feedback sampling circuit, and the output end is connected to the input end of the flyback switch circuit; the command agreement receives the input end of the coding circuit and the output end of the control circuit The output end of the output rectifying and filtering circuit and the output end of the command transmission circuit are connected, and the output end is connected with the load; and the input end of the command transmission circuit is connected with the output end of the control circuit, and the input end and the input of the output rectifying and filtering circuit are input. The input ends of the command and the protocol receiving and receiving circuits are connected.

本創作開關電源充電電路內含市場上多種主流通信協定的解碼電路，對不同類型的可攜式設備所發出的通信指令都能得到很好的加以識別，從而判別是A類型設備、B類型設備、還是C類設備，採用本創作開關電源電路所設計的開關電源充電器可以僅用一個充電器給市場上不同類型的設備進行充電，並且根據不同的通信指令輸出不同的等級的電壓，在極大提高系統充電效率的同時，也極大的提高了對各種不同類型可攜式設備的相容性。The switching power supply charging circuit of the present invention includes decoding circuits of various mainstream communication protocols on the market, and the communication commands issued by different types of portable devices can be well recognized, thereby discriminating that it is an A type device and a B type device. Or a class C device, the switching power supply charger designed by the present switching power supply circuit can use only one charger to charge different types of devices on the market, and output different levels of voltage according to different communication commands, While improving the charging efficiency of the system, it also greatly improves the compatibility of various types of portable devices.

例如當生產廠家在生產可攜式設備的充電器時，僅需針對該解碼電路製造一種充電設備就能夠很好的相容幾乎市場上所有的可攜式設備，極大的節約了系統製造成本、安規認證成本。並且在未來可能大大的減少市場上充電器的數量，從而極大的減少以往由於大量的廢舊充電器廢棄所造成的環境污染。For example, when a manufacturer manufactures a charger for a portable device, it is only necessary to manufacture a charging device for the decoding circuit to be compatible with almost all portable devices on the market, which greatly saves system manufacturing costs, Safety certification costs. And in the future, it may greatly reduce the number of chargers on the market, thereby greatly reducing the environmental pollution caused by the abandonment of a large number of used chargers.

將本創作提供的開關電源應用在可攜式設備電池充電領域應用，可以應用在多種不同類型的可攜式設備的充電場合，可以極大的節約系統成本。The application of the switching power supply provided by the present invention in the battery charging field of portable devices can be applied to charging occasions of a plurality of different types of portable devices, which can greatly save system cost.

1‧‧‧AC輸入整流和EMI濾波電路1‧‧‧AC input rectification and EMI filter circuit

2‧‧‧反激開關電路2‧‧‧ flyback switching circuit

3‧‧‧控制電路3‧‧‧Control circuit

4‧‧‧供電電路4‧‧‧Power supply circuit

5‧‧‧輸出整流濾波電路5‧‧‧Output rectification filter circuit

6‧‧‧回饋取樣電路6‧‧‧Feedback sampling circuit

7‧‧‧過沖吸收電路7‧‧‧Overshoot absorption circuit

8‧‧‧指令協定接收編碼電路8‧‧‧Instruction agreement receiving coding circuit

9‧‧‧指令傳輸電路9‧‧‧Command transmission circuit

100‧‧‧A類可攜式設備100‧‧‧Class A portable device

101‧‧‧主控晶片101‧‧‧Master chip

102‧‧‧負載模組102‧‧‧Load Module

200,300‧‧‧開關電源200,300‧‧‧Switching power supply

201‧‧‧解碼晶片201‧‧‧Decoder chip

202‧‧‧功率控制模組202‧‧‧Power Control Module

301‧‧‧功率器件301‧‧‧Power devices

302,305‧‧‧指令協定接收編碼電路(指令接收器)302,305‧‧‧Instruction agreement receiving coding circuit (instruction receiver)

303‧‧‧隔離元件303‧‧‧Isolation components

304‧‧‧控制晶片304‧‧‧Control chip

310‧‧‧供電輸入310‧‧‧Power input

320‧‧‧可攜式設備320‧‧‧Portable devices

C5‧‧‧吸收電容C5‧‧‧ absorbing capacitor

C6‧‧‧濾波電容C6‧‧‧Filter Capacitor

D-,D+‧‧‧資料接收端D-, D+‧‧‧ data receiving end

D7‧‧‧單向二極體D7‧‧‧ one-way diode

D8‧‧‧輸出整流二極體D8‧‧‧ output rectifying diode

FUSE‧‧‧保險絲FUSE‧‧‧Fuse

Q1‧‧‧開關Q1‧‧‧ switch

Q2‧‧‧BJT三極管Q2‧‧‧BJT Transistor

R2,R3,R4,R5,R8‧‧‧電阻R2, R3, R4, R5, R8‧‧‧ resistance

R6‧‧‧吸收電阻R6‧‧‧ absorption resistor

R7‧‧‧原邊電流取樣電阻R7‧‧‧ primary current sampling resistor

R9‧‧‧限流電阻R9‧‧‧ current limiting resistor

T1-A‧‧‧反激變壓器T1-A‧‧‧ flyback transformer

T1-B‧‧‧變壓器輔助繞組T1-B‧‧‧Transformer auxiliary winding

U1‧‧‧原邊晶片U1‧‧‧ primary wafer

U3‧‧‧晶片U3‧‧‧ wafer

U2-A‧‧‧光電耦合器U2-A‧‧‧Photocoupler

U2-BA,U2-B‧‧‧光耦合器U2-BA, U2-B‧‧‧Optocoupler

第1圖示出了現有技術中僅支援一種協定方案的開關電源系統的示例性框圖。Figure 1 shows an exemplary block diagram of a prior art switching power supply system that only supports one protocol scheme.

第2圖示出了現有技術中僅支援另一種協定方案的副邊控制開關電源快充電路的示例性圖示。Figure 2 shows an exemplary illustration of a secondary side control switching power supply fast charging path that only supports another protocol solution in the prior art.

第3圖示出了根據本創作實施例的多通信協議相容方案的概要性框圖。Figure 3 shows a schematic block diagram of a multi-communication protocol compatible scheme in accordance with the presently-created embodiment.

第4圖示出了根據本創作實施例的開關電源電路的一種示例性接法。Fig. 4 shows an exemplary connection of a switching power supply circuit according to the presently-created embodiment.

第5圖示出了根據本創作實施例的開關電源電路的另一種示例性接法。Fig. 5 shows another exemplary connection of the switching power supply circuit according to the presently-created embodiment.

第6圖示出了根據本創作實施例的開關電源電路的一種接法的詳細圖示。Fig. 6 is a detailed diagram showing a connection of the switching power supply circuit according to the present embodiment.

第7圖示出了外部電阻降壓時控制下降時間的一種示例性方法。Figure 7 shows an exemplary method of controlling the fall time when the external resistor is stepped down.

第8圖示出了外部電阻降壓時控制下降時間的另一種示例性方法。Figure 8 shows another exemplary method of controlling the fall time when the external resistor is stepped down.

第9圖示出了根據本創作實施例的開關電源電路的供電電路的一種示例性接法。Fig. 9 shows an exemplary connection of the power supply circuit of the switching power supply circuit according to the present embodiment.

第10圖示出了根據本創作實施例的開關電源電路的供電電路的另一種示例性接法。Fig. 10 shows another exemplary connection of the power supply circuit of the switching power supply circuit according to the presently-created embodiment.

第11圖示出了根據本創作實施例的開關電源電路的過沖吸收電路的多種示例性接法。Fig. 11 shows various exemplary connections of the overshoot absorbing circuit of the switching power supply circuit according to the presently-created embodiment.

下面將詳細描述本創作各個方面的特徵和示例性實施例。下面的描述涵蓋了許多具體細節，以便提供對本創作的全面理解。但是，對於本領域技術人員來說顯而易見的是，本創作可以在不需要這些具體細節中的一些細節的情況下實施。下面對實施例的描述僅僅是為了通過示出本創作的示例來提供對本創作更清楚的理解。本創作絕不限於下面所提出的任何具體配置，而是在不脫離本創作的精神的前提下覆蓋了相關元素或部件的任何修改、替換和改進。Features and exemplary embodiments of various aspects of the present work are described in detail below. The following description covers many specific details to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely provided to provide a clearer understanding of the present invention by the example of the present invention. The present invention is in no way limited to any specific configuration as set forth below, but without departing from the spirit of the present invention, any modification, substitution, or modification of the related elements or components.

根據本創作實施例的開關電源電路由兩部分組成，一部分為原邊回饋PWM控制主控晶片，另外一部分為通信協定接收和編碼晶片。The switching power supply circuit according to the present embodiment is composed of two parts, one is a primary side feedback PWM control master chip, and the other part is a communication protocol receiving and encoding chip.

根據一實施例，第3圖示出了根據本創作實施例的多通信協議相容方案的概要性框圖。如第3圖所示，開關電源300包括連接至供電輸入310的功率器件301、指令協定接收編碼電路(指令接收器)302和305、控制晶片304、以及可選地包括上述元件之間的隔離元件303。功率器件301向所連接的可攜式設備320輸出功率，而不同類型的可攜式設備向開關電源300發送不同的輸出電壓調節指令(例如指令A、指令B)。According to an embodiment, FIG. 3 shows a schematic block diagram of a multi-communication protocol compatible scheme in accordance with the present creative embodiment. As shown in FIG. 3, switching power supply 300 includes power device 301 coupled to power supply input 310, command protocol receive encoding circuits (instruction receivers) 302 and 305, control die 304, and optionally isolation between the components described above. Element 303. Power device 301 outputs power to connected portable device 320, while different types of portable devices send different output voltage adjustment commands (eg, instruction A, instruction B) to switching power supply 300.

在第3圖中，供電部分適用交流或直流供電等各種供電方式。不同類型的可攜式設備向開關電源發送不同的輸出電壓調節指令，其傳輸方式可以有電流傳輸或電壓傳輸，包括單線或多線等多種編碼方式。指令類型包括電流脈衝、電壓脈衝、數位脈衝信號、PWM脈衝電壓等多種指令。開關電源類型包括隔離型和非隔離型等各種電路結構，隔離型電路結構中其回饋方式適用於原邊回饋方式，另外開關電源功率轉換拓撲結構包括降壓Buck、升壓Boost、升降壓Buck-Boost、反激Flyback、正激Forward等各種電路拓撲結構。In Fig. 3, the power supply section is applied to various power supply modes such as AC or DC power supply. Different types of portable devices send different output voltage adjustment commands to the switching power supply, and the transmission modes thereof may include current transmission or voltage transmission, including multiple coding modes such as single-line or multi-line. The instruction types include various types of instructions such as current pulse, voltage pulse, digital pulse signal, and PWM pulse voltage. Switching power supply types include various circuit structures such as isolated and non-isolated. In the isolated circuit structure, the feedback mode is suitable for the primary side feedback mode. In addition, the switching power supply power conversion topology includes buck Buck, boost boost, buck-boost Buck- Various circuit topologies such as Boost, Flyback, Forward Forward, etc.

為便於闡述本創作的內容，根據一實施例，以下以一種用於手機外置充電器的反激式開關電源為例進行說明，但是，本領域技術人員應當理解，本創作覆蓋範圍並不僅限於以下實例應用，而是具有更廣泛的應用範圍。In order to facilitate the description of the present content, according to an embodiment, a flyback switching power supply for a mobile phone external charger is taken as an example. However, those skilled in the art should understand that the scope of the present invention is not limited to The following examples are applied, but have a broader range of applications.

第4圖示出了根據本創作實施例的開關電源的一種示例性 接法。在第4圖中，電路採用交流輸入，電路結構為隔離型反激式開關電源電路。二次側負載設備的發出的A類指令，其方法是通過輸出負載電流按特定規律變化的方式，將其變化通過反激變壓器T1-A傳輸至原邊晶片U1，來控制輸出電壓的變化。而如果負載設備發出了B類指令(例如電壓脈衝或電壓准位元按特定規律(pattern)變化)，則B類指令可以通過資料接收端D-和/或D+進入晶片U3，晶片U3識別B類指令後對其進行編碼，從而將經編碼的信號經由光電耦合器U2-A傳輸至原邊晶片U1，用於控制輸出電壓的變化。FIG. 4 shows an exemplary example of a switching power supply according to the present creative embodiment. Connection. In Figure 4, the circuit uses an AC input and the circuit structure is an isolated flyback switching power supply circuit. The Class A command issued by the secondary side load device is controlled by the output load current to be transmitted to the primary side wafer U1 through the flyback transformer T1-A in a manner that varies according to a specific law to control the change of the output voltage. If the load device issues a Class B command (for example, a voltage pulse or a voltage level change according to a specific pattern), the Class B command can enter the wafer U3 through the data receiving end D- and/or D+, and the chip U3 recognizes B. The class of instructions is then encoded to pass the encoded signal to the primary side wafer U1 via the photocoupler U2-A for controlling the change in output voltage.

第5圖示出了根據本創作實施例的開關電源電路的另一種示例性接法。如第5圖所示，根據線路啟動方式和供電方式的不同，電路還可以衍生出另外一種形式的電路接法。例如，控制電路的原邊晶片U1可以是8引腳的。並且輸入整流濾波電路與供電電路之間的電阻R2可以被連接至輸入整流濾波電路與控制電路的原邊晶片U1的GATE引腳之間，以提供不同的可控供電方式。Fig. 5 shows another exemplary connection of the switching power supply circuit according to the presently-created embodiment. As shown in Figure 5, the circuit can also derive another form of circuit connection depending on the line startup mode and power supply mode. For example, the primary side wafer U1 of the control circuit can be 8-pin. And the resistor R2 between the input rectification filter circuit and the power supply circuit can be connected between the input rectification filter circuit and the GATE pin of the primary side chip U1 of the control circuit to provide different controllable power supply modes.

第6圖示出了根據本創作實施例的開關電源電路的一種接法的詳細圖示。如第6圖所示，根據本創作實施例的可調反激式開關電路主要包括以下元件：AC輸入整流和EMI濾波電路1、反激開關電路2、控制電路3、供電電路4、輸出整流濾波電路5、回饋取樣電路6、過沖吸收電路7、指令協定接收編碼電路8、以及指令傳輸電路9。Fig. 6 is a detailed diagram showing a connection of the switching power supply circuit according to the present embodiment. As shown in FIG. 6, the adjustable flyback switching circuit according to the present embodiment mainly includes the following components: an AC input rectification and EMI filter circuit 1, a flyback switch circuit 2, a control circuit 3, a power supply circuit 4, and an output rectification. The filter circuit 5, the feedback sampling circuit 6, the overshoot absorption circuit 7, the command protocol reception coding circuit 8, and the instruction transmission circuit 9.

AC輸入整流和EMI濾波電路1可以包括保險絲FUSE、橋式整流器、X電容部分。AC輸入整流和EMI濾波電路1的AB兩點之間還可以包括本領域的其它常見接法。The AC input rectification and EMI filter circuit 1 may include a fuse FUSE, a bridge rectifier, and an X capacitor portion. Other common connections in the art may also be included between the two points of the AC input rectification and EMI filter circuit 1 AB.

反激開關電路2可以包括反激變壓器T1-A、開關MOSFET管或BJT三極管Q2、以及原邊電流取樣電阻R7部分。The flyback switching circuit 2 may include a flyback transformer T1-A, a switching MOSFET or BJT transistor Q2, and a primary side current sampling resistor R7 portion.

控制電路3的主要元件是一脈衝寬度調製(PWM)控制晶片及必要的週邊輔助元件，本實施例中是一六個功能腳(pin)或八個功能腳的控制晶片，其中(不按腳位元順序)：VDD：供電輸入腳，用於晶片供電啟動，與供電電路4相連， FB：回饋取樣腳，用於檢測輸出電壓，與回饋取樣電路6相連，GND：晶片地腳，晶片的參考接地，GATE：Gate驅動腳，用於控制功率MOSFET或BJT三極管Q2的開關，與反激開關電路2相連，CS：電流採樣腳，用於檢測變壓器原邊電流，在原邊電流取樣電阻R7上採集電壓資訊，與反激開關電路2相連，DATA：通信指令腳，用於接收負載設備傳送的調節輸出電壓和電流的指令資訊，與指令協定接收編碼電路8相連，SOURCE：源級腳，在採用八腳晶片的電路中帶有此腳，與反激開關電路2中的MOSFET源級或BJT三極管Q2的發射極相連，以及CMP：環路補償腳，在採用八腳晶片的電路中帶有此腳，外接環路補償電容，用於改善負反饋系統環路回應及穩定性。The main components of the control circuit 3 are a pulse width modulation (PWM) control chip and the necessary peripheral auxiliary components. In this embodiment, it is a control chip of six function pins or eight function pins, wherein Bit order): VDD: power supply input pin, used for power supply start of the chip, connected to the power supply circuit 4, FB: feedback sampling pin, used to detect the output voltage, connected to the feedback sampling circuit 6, GND: wafer ground, reference ground of the chip, GATE: Gate drive pin, used to control the switching of the power MOSFET or BJT transistor Q2, and The excitation switch circuit 2 is connected, CS: current sampling pin is used for detecting the primary current of the transformer, and the voltage information is collected on the primary current sampling resistor R7, and is connected with the flyback switch circuit 2, and the DATA: communication command pin is used for receiving the load device. The transmitted command information for adjusting the output voltage and current is connected to the command protocol receiving and encoding circuit 8. The SOURCE: source pin has this pin in the circuit using the eight-pin chip, and the MOSFET source level in the flyback switch circuit 2. Or the emitter of the BJT transistor Q2 is connected, and the CMP: loop compensation pin is provided in the circuit with the eight-pin chip, and the external loop compensation capacitor is used to improve the loop response and stability of the negative feedback system.

指令協定接收編碼電路8是6功能腳的解碼編碼晶片，可以接收但不限於以下信號：電壓准位元信號、電流准位元信號、PWM脈衝調製信號、數位編碼信號等。並且在本實施例中，指令協定接收編碼電路8的引腳如下(不按腳位元順序)：VDD：供電腳，用於晶片供電啟動與主控制電路輸出部分相連，GND：晶片地腳，晶片的參考接地，D+：資料正接收端腳，D-：資料負接收端腳，VD：信號傳輸腳，該腳的編碼脈衝通過指令傳輸電路9傳輸到控制電路3之PWM控制晶片，以及VP：通過電阻R8接控制電路3之PWM控制晶片輸出Vbus，控制輸出電壓下降時的時間長短。作為一個示例，第7圖示出了外接電阻用於控制輸出電壓下降時間的一種示例性方法。The command protocol receiving and encoding circuit 8 is a decoding coded chip of 6 function pins, and can receive but is not limited to the following signals: a voltage level bit signal, a current level bit signal, a PWM pulse modulation signal, a digital coded signal, and the like. In the present embodiment, the pins of the instruction protocol receiving encoding circuit 8 are as follows (not in the order of the bit bits): VDD: power supply pin, for the power supply start of the chip is connected with the output portion of the main control circuit, GND: wafer foot, Reference ground of the chip, D+: data receiving terminal, D-: data negative receiving terminal, VD: signal transmitting pin, the encoded pulse of the pin is transmitted to the PWM control chip of the control circuit 3 through the command transmission circuit 9, and VP : The PWM control chip output Vbus connected to the control circuit 3 through the resistor R8 controls the length of time when the output voltage drops. As an example, FIG. 7 illustrates an exemplary method in which an external resistor is used to control the output voltage fall time.

根據另一個實施例，第8圖示出了無外接電阻輸出電壓下降控制的另一種示例性方法。According to another embodiment, FIG. 8 illustrates another exemplary method without external resistor output voltage drop control.

此外，除了第6圖中示出的接法之外，供電電路4的A、B兩點之間還有其它接法。例如，根據一個實施例，第9圖示出了根據本創作實施例的開關電源電路的供電電路的一種示例性接法；第10圖示出了根據本創作實施例的開關電源電路的供電電路的另一種示例性接法。如第9圖所示，A點可以通過電阻R3，經由開關Q1連接至B點；或者，如第10圖所示，A點可以通過電阻R3直接連接至B點。Further, in addition to the connection shown in Fig. 6, there are other connections between the two points A and B of the power supply circuit 4. For example, according to one embodiment, FIG. 9 illustrates an exemplary connection of a power supply circuit of a switching power supply circuit according to the present creative embodiment; and FIG. 10 illustrates a power supply circuit of a switching power supply circuit according to the present creative embodiment. Another exemplary connection. As shown in Figure 9, point A can be connected to point B via switch Q1 via resistor R3; or, as shown in Figure 10, point A can be directly connected to point B via resistor R3.

如第6圖所示，輸出整流濾波電路5可以包括輸出整流二極體D8、濾波電容C6、及輸入假負載三個主要部分，根據EMI的需要，輸出整流二極體D8可以並聯RC吸收電路，針對不同的輸出紋波要求，輸出整流濾波電路5可以增加型濾波電路或者共模濾波電路。輸出整流濾波電路5AB兩點之間還可以包括本領域的其它常見接法。As shown in FIG. 6, the output rectification filter circuit 5 may include three main parts: an output rectifying diode D8, a filter capacitor C6, and an input dummy load. According to the EMI requirement, the output rectifying diode D8 may be connected in parallel with the RC snubber circuit. , for different output ripple requirements, the output rectification filter circuit 5 can be increased Type filter circuit or common mode filter circuit. Other common connections in the art may also be included between the two points of the output rectification and filtering circuit 5AB.

回饋取樣電路6可以包括變壓器輔助繞組T1-B、以及由一個或多個電阻R4,R5組成的分壓電阻網路，從而檢測輸出電壓資訊。The feedback sampling circuit 6 may include a transformer auxiliary winding T1-B and a voltage dividing resistor network composed of one or more resistors R4, R5 to detect output voltage information.

過沖吸收電路7可以包括吸收電阻R6、吸收電容C5和單向二極體D7三部分。根據一個實施例，第11圖示出了根據本創作實施例的開關電源電路的過沖吸收電路的多種示例性接法。此外，過沖吸收電路7中A、B兩點之間還可以包括但不限於如第11圖所述的接法。The overshoot absorbing circuit 7 may include three parts of an absorbing resistor R6, an absorbing capacitor C5, and a unidirectional diode D7. According to one embodiment, FIG. 11 illustrates various exemplary connections of an overshoot absorbing circuit of a switching power supply circuit in accordance with the present creative embodiment. In addition, the two points A and B in the overshoot absorbing circuit 7 may also include, but are not limited to, the connection method as shown in FIG.

指令傳輸電路9可以包括一個或多個限流電阻R9、光耦合器U2-BA、U2-B。指令傳輸電路9被連接在原邊回饋PWM控制電路3、輸出整流濾波電路5以及指令協定接收編碼電路8之間。當指令協定接收編碼電路8接收到可攜式移動設備提供的升壓或降壓信號時，通過內部轉換給出不同類型的信號包括但不限於：電壓准位元信號、PWM脈衝調製信號、數位編碼信號等。信號通過光耦傳輸到PWM控制電路3的一次側實現二次側輸出電壓的多級輸出。The command transmission circuit 9 may include one or more current limiting resistors R9, optocouplers U2-BA, U2-B. The command transmission circuit 9 is connected between the primary side feedback PWM control circuit 3, the output rectification filter circuit 5, and the command protocol reception coding circuit 8. When the instruction protocol receiving and encoding circuit 8 receives the boost or buck signal provided by the portable mobile device, different types of signals are given by internal conversion, including but not limited to: voltage level signal, PWM pulse modulation signal, digital Coded signal, etc. The signal is transmitted to the primary side of the PWM control circuit 3 through the photocoupler to realize multi-level output of the secondary side output voltage.

本創作提供的開關電源電路具有以下優點：製造成本低，電路結構簡單，相容性好且輸出電壓電流可調。The switching power supply circuit provided by the present invention has the following advantages: low manufacturing cost, simple circuit structure, good compatibility, and adjustable output voltage and current.

以上已經參考本創作的具體實施例來描述了本創作，但是本領域技術人員均瞭解，可以對這些具體實施例進行各種修改、組合和變更，而不會脫離由所附申請專利範圍或其等同物限定的本創作的精神和範圍。 此外，附圖中的任何信號箭頭應當被認為僅是示例性的，而不是限制性的，除非另有具體指示。當術語被預見為使分離或組合的能力不清楚時，元件或者步驟的組合也將被認為是已經記載了。The present invention has been described above with reference to the specific embodiments of the present invention, but it will be understood by those skilled in the art that various modifications, combinations and changes may be made to the specific embodiments without departing from the scope of the appended claims. The spirit and scope of this creation. In addition, any signal arrows in the figures should be considered as illustrative only and not limiting, unless specifically indicated otherwise. Combinations of elements or steps are also considered to have been described when the term is foreseen to be unclear.

300‧‧‧開關電源300‧‧‧Switching power supply

301‧‧‧功率器件301‧‧‧Power devices

302,305‧‧‧指令協定接收編碼電路(指令接收器)302,305‧‧‧Instruction agreement receiving coding circuit (instruction receiver)

303‧‧‧隔離元件303‧‧‧Isolation components

304‧‧‧控制晶片304‧‧‧Control chip

310‧‧‧供電輸入310‧‧‧Power input

320‧‧‧可攜式設備320‧‧‧Portable devices

Claims (12)

一種開關電源電路，包括交流電源(AC)輸入整流和電磁干擾(EMI)濾波電路、反激開關電路、控制電路、供電電路、輸出整流濾波電路、回饋取樣電路、過沖吸收電路、指令協定接收編碼電路以及指令傳輸電路，其中：所述交流電源(AC)輸入整流和電磁干擾(EMI)濾波電路的輸入端與交流電源相連接，輸出端與所述供電電路的輸入端相連接；所述反激開關電路的輸入端與所述控制電路的輸出端和所述過沖吸收電路的輸出端相連接，輸出端與所述輸出整流濾波電路的輸入端相連接；所述控制電路的輸入端與所述供電電路的輸出端、所述回饋取樣電路的輸入端相連接，輸出端與所述反激開關電路的輸入端、所述指令協定接收編碼電路的輸入端以及所述指令傳輸電路的輸入端相連接；所述供電電路的輸入端與所述交流電源(AC)輸入整流和電磁干擾(EMI)濾波電路的輸出端相連接，輸出端與所述回饋取樣電路的輸入端以及所述控制電路的輸入端相連接；所述輸出整流濾波電路的輸入端與反激開關電路的輸出端相連接，輸出端與負載以及所述指令協定接收編碼電路的輸入端相連接；所述回饋取樣電路的輸入端與所述供電電路的輸出端、所述控制電路的輸入端相連接，輸出端與所述過沖吸收電路的輸入端相連接；所述過沖吸收電路的輸入端與所述回饋取樣電路的輸出端相連接，輸出端與所述反激開關電路的輸入端相連接；所述指令協定接收編碼電路的輸入端與所述控制電路的輸出端、所述輸出整流濾波電路的輸出端以及所述指令傳輸電路的輸出端相連接，輸出端與負載相連接；並且所述指令傳輸電路的輸入端與所述控制電路的輸出端相連接，輸出端與所述輸出整流濾波電路的輸入端、所述指令協定接收編碼電路的輸入端相連接。 A switching power supply circuit comprising an alternating current power supply (AC) input rectification and electromagnetic interference (EMI) filter circuit, a flyback switch circuit, a control circuit, a power supply circuit, an output rectification filter circuit, a feedback sampling circuit, an overshoot absorption circuit, and an instruction protocol reception An encoding circuit and an instruction transmission circuit, wherein: an input end of the alternating current power (AC) input rectification and electromagnetic interference (EMI) filter circuit is connected to an alternating current power source, and an output end is connected to an input end of the power supply circuit; An input end of the flyback switch circuit is connected to an output end of the control circuit and an output end of the overshoot absorption circuit, and an output end is connected to an input end of the output rectification filter circuit; an input end of the control circuit And an output end of the power supply circuit, an input end of the feedback sampling circuit, an output end, an input end of the flyback switch circuit, an input end of the command receiving receiving coding circuit, and an instruction transmission circuit The input end is connected; the input end of the power supply circuit and the alternating current power source (AC) input rectification and electromagnetic interference (EMI) filter circuit are input The end phase is connected, the output end is connected to the input end of the feedback sampling circuit and the input end of the control circuit; the input end of the output rectification filter circuit is connected with the output end of the flyback switch circuit, and the output end and the load And an input end of the instruction protocol receiving and encoding circuit is connected; an input end of the feedback sampling circuit is connected to an output end of the power supply circuit, an input end of the control circuit, an output end and the overshoot absorption circuit The input end is connected; the input end of the overshoot absorbing circuit is connected to the output end of the feedback sampling circuit, and the output end is connected to the input end of the flyback switch circuit; The input end is connected to an output end of the control circuit, an output end of the output rectification filter circuit, and an output end of the command transmission circuit, and an output end is connected to the load; and an input end of the instruction transmission circuit is An output end of the control circuit is connected, an output end is connected to an input end of the output rectification filter circuit, and the instruction is in agreement to receive an encoding circuit The end of the connection. 如申請專利範圍第1項所述之開關電源電路，其特徵在於，所述控制電路包括脈衝寬度調製(PWM)控制晶片，該脈衝寬度調製(PWM)控制晶 片包括：供電輸入腳，用於為所述控制晶片供電，與所述供電電路的輸出端相連接；回饋取樣腳，用於檢測所述開關電源電路的輸出電壓，與所述回饋取樣電路的輸入端相連接；晶片接地腳，用作所述控制晶片的參考接地；驅動腳，用於驅動所述反激開關電路中的開關管，與所述反激開關電路的輸入端相連接；電流採樣腳，用於對所述反激開關電路中的變壓器的原邊電流進行採樣，與所述反激開關電路的輸出端相連接；以及通信指令腳，用於接收所述負載傳送的調節輸出電壓和電流的指令資訊，與所述指令傳輸電路的輸入端相連。 The switching power supply circuit of claim 1, wherein the control circuit comprises a pulse width modulation (PWM) control chip, and the pulse width modulation (PWM) control crystal The chip includes: a power input pin for supplying power to the control chip, and being connected to an output end of the power supply circuit; and a feedback sampling pin for detecting an output voltage of the switching power supply circuit, and the feedback sampling circuit The input end is connected; the chip grounding leg is used as a reference ground of the control chip; the driving leg is used to drive the switching tube in the flyback switching circuit, and is connected to the input end of the flyback switching circuit; a sampling pin for sampling a primary current of the transformer in the flyback switch circuit, connected to an output end of the flyback switch circuit; and a communication command pin for receiving the regulated output of the load transfer The command information of the voltage and current is connected to the input of the command transmission circuit. 如申請專利範圍第2項所述之開關電源電路，其特徵在於，在採用八腳晶片的電路中，該脈衝寬度調製(PWM)控制晶片還包括：環路補償腳，外接環路補償電容，用於改善負反饋系統環路回應及穩定性。 The switching power supply circuit of claim 2, wherein in the circuit using the eight-pin chip, the pulse width modulation (PWM) control chip further comprises: a loop compensation leg, and an external loop compensation capacitor, Used to improve loop response and stability of negative feedback systems. 如申請專利範圍第2項所述之開關電源電路，其特徵在於，在採用八腳晶片的電路中，該脈衝寬度調製(PWM)控制晶片還包括：源級腳，用於與所述反激開關電路中的金屬氧化物半導體場效應電晶體(MOSFET)源級或雙極型接面電晶體(BJT)三極管的發射極相連。 The switching power supply circuit of claim 2, wherein in the circuit using the eight-pin chip, the pulse width modulation (PWM) control chip further includes: a source stage for the flyback The emitter of the metal-oxide-semiconductor field effect transistor (MOSFET) source or the bipolar junction transistor (BJT) transistor in the switching circuit is connected. 如申請專利範圍第2項所述之開關電源電路，其特徵在於，所述指令協定接收編碼電路包括解碼編碼晶片，該解碼編碼晶片包括：供電腳，用於所述晶片的供電啟動，與所述控制電路的輸出端相連接；晶片接地腳，用作所述控制晶片的參考接地；D+腳，用作資料正接收端；D-腳，用作資料負接收端；以及VD腳，用於信號傳輸的腳，該VD腳的編碼脈衝傳輸到所述脈衝寬度調製(PWM)控制晶片。 The switching power supply circuit of claim 2, wherein the command-receiving receiving and encoding circuit comprises a decoding-encoding chip, the decoding-encoding chip comprising: a power supply pin, and a power-on starting for the chip, The output terminals of the control circuit are connected; the grounding pin of the chip is used as a reference ground for the control chip; the D+ pin is used as a data receiving end; the D-foot is used as a data receiving end; and the VD pin is used for At the foot of the signal transmission, the encoded pulse of the VD pin is transmitted to the pulse width modulation (PWM) control chip. 如申請專利範圍第5項所述之開關電源電路，其特徵在於，該解碼編碼晶片還包括：VP腳，通過電阻連接到所述脈衝寬度調製(PWM)控制晶片、或者直接連接到所述脈衝寬度調製(PWM)控制晶片，用於輸出電壓 信號以控制輸出電壓下降時時間長短。 The switching power supply circuit of claim 5, wherein the decoded coded chip further comprises: a VP pin connected to the pulse width modulation (PWM) control chip via a resistor, or directly connected to the pulse Width Modulation (PWM) control chip for output voltage The signal controls how long the output voltage drops. 如申請專利範圍第1項所述之開關電源電路，其特徵在於，該開關電源電路還包括光耦傳輸電路，連接在所述控制電路和所述指令協定接收編碼電路之間，用處傳輸編碼脈衝。 The switching power supply circuit of claim 1, wherein the switching power supply circuit further comprises an optocoupler transmission circuit connected between the control circuit and the instruction protocol receiving and encoding circuit, and transmitting the coded pulse at the use. . 如申請專利範圍第1項所述之開關電源電路，其特徵在於，輸出整流濾波電路包括輸出整流二極體和濾波電容。 The switching power supply circuit of claim 1, wherein the output rectifying and filtering circuit comprises an output rectifying diode and a filtering capacitor. 如申請專利範圍第8項所述之開關電源電路，其特徵在於，輸出整流濾波電路還包括π型濾波電路和/或共模濾波電路。 The switching power supply circuit of claim 8, wherein the output rectifying and filtering circuit further comprises a π-type filtering circuit and/or a common mode filtering circuit. 如申請專利範圍第1項所述之開關電源電路，其特徵在於，回饋取樣電路由取樣電阻組成。 The switching power supply circuit of claim 1, wherein the feedback sampling circuit is composed of a sampling resistor. 如申請專利範圍第1項所述之開關電源電路，其特徵在於，通過輸出負載電流有規律性的變化及通過變壓器耦合，來控制輸出電壓及電流的方法。 The switching power supply circuit according to claim 1, wherein the output voltage and current are controlled by a regular change of the output load current and a transformer coupling. 如申請專利範圍第1項所述之開關電源電路，其特徵在於，通過指令協定接收編碼電路及光耦來控制輸出電壓及電流的方法 The switching power supply circuit of claim 1, wherein the method of receiving an encoding circuit and an optocoupler to control an output voltage and current by an instruction protocol
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