技术领域：Technical field:
本实用新型涉及一种开关电源，特别是涉及一种反激式微功率开关电源。The utility model relates to a switching power supply, in particular to a flyback micropower switching power supply.
背景技术：Background technique:
开关电源的设计涉及到的知识方方面面，不仅涉及到模拟数字电路，半导体元件特性，电磁学知识，还需要考虑产品散热，安全要求、电兼容性能等。传统的设计需要人工来完成，其步骤繁琐，工作量大，效率低。传统控制电路的外围器件多，结构繁冗，一个环节出现问题，电源就无法正常工作，产品可靠性差。The design of switching power supply involves all aspects of knowledge, not only analog and digital circuits, semiconductor component characteristics, electromagnetic knowledge, but also product heat dissipation, safety requirements, electrical compatibility performance, etc. need to be considered. The traditional design needs to be completed manually, the steps are cumbersome, the workload is heavy, and the efficiency is low. The traditional control circuit has many peripheral devices and a complicated structure. If there is a problem in one link, the power supply cannot work normally, and the product reliability is poor.
实用新型内容：Utility model content:
本实用新型所要解决的技术问题是：克服现有技术的不足，其拓扑结构采用反激式，省去了脉冲变压器的一个电源次级绕组，使得电源的设计电路更加简化，同时具有多路输出的反激式微功率开关电源。The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art, its topology adopts the flyback type, which saves a secondary winding of the power supply of the pulse transformer, makes the design circuit of the power supply more simplified, and has multiple outputs at the same time flyback micropower switching power supply.
本实用新型的技术方案是：一种反激式微功率开关电源，包括缓冲保护电路，EMC电路，整流滤波电路，PWM变送电路，整流输出电路和稳压反馈电路，所述缓冲保护电路、EMC电路和整流滤波电路把交流电源转化成高电平直流信号，高电平直流信号经过PWM变送电路，转化成低电压交流脉冲信号，低电压交流脉冲信号经过整流输出电路转化成直流信号，直流信号输入稳压反馈电路，并通过光耦将隔离把产生的开通/关断信号传输给开关电源控制芯片，所述整流输出电路具有两个输出端口。The technical scheme of the utility model is: a flyback micropower switching power supply, including a buffer protection circuit, an EMC circuit, a rectification filter circuit, a PWM transmission circuit, a rectification output circuit and a voltage stabilization feedback circuit, the buffer protection circuit, EMC The circuit and the rectification filter circuit convert the AC power into a high-level DC signal, and the high-level DC signal is converted into a low-voltage AC pulse signal through the PWM transmission circuit, and the low-voltage AC pulse signal is converted into a DC signal through the rectification output circuit. The signal is input to the voltage stabilization feedback circuit, and the generated on/off signal is transmitted to the switching power supply control chip through isolation through the optocoupler, and the rectification output circuit has two output ports.
所述缓冲保护电路包括RQ1和MOV1，所述RQ1为辅温度系数电阻，且型号为MT72-10D7，所述MOV1为压敏电阻，且型号为14D471K。The buffer protection circuit includes RQ1 and MOV1, the RQ1 is an auxiliary temperature coefficient resistor, and the model is MT72-10D7, and the MOV1 is a piezoresistor, and the model is 14D471K.
所述EMC电路包括L1、C1，所述L1为5.6mH/1A的环形共模电感，所述C1为0.1uF/275V的X1型安规电容。The EMC circuit includes L1 and C1, the L1 is a 5.6mH/1A annular common-mode inductor, and the C1 is a 0.1uF/275V X1 type safety capacitor.
所述整流滤波电路包括DB1、L2-3、C2-3，所述DB1为GBP08(2A、800V)型整流桥，L2-3为1mH/1A型工型电感，C2-3为6.8uF/450V型电解电容，稳压反馈电路包括TL431、反馈光耦和外围电路。The rectification filter circuit includes DB1, L2-3, C2-3, the DB1 is a GBP08 (2A, 800V) rectifier bridge, L2-3 is a 1mH/1A I-type inductor, and C2-3 is 6.8uF/450V Type electrolytic capacitors, voltage regulator feedback circuit includes TL431, feedback optocoupler and peripheral circuits.
所述PWM变送电路包括主控芯片、脉冲变压器和续流电路，所述主控芯片型号为LNK364，所述脉冲变压器为EE16磁芯、材料为PC47、初级绕组为87匝的变压器，且两个次级输出端口的匝数为6匝和14匝。The PWM transmission circuit includes a main control chip, a pulse transformer and a freewheeling circuit, the model of the main control chip is LNK364, the pulse transformer is a transformer with an EE16 magnetic core, a material of PC47, and a primary winding of 87 turns. The turns of the secondary output ports are 6 turns and 14 turns.
所述续流电路包括D1、R2和C4，所述D1为超快速二极管MUR160、R2为10K/1W电阻、C4为102/1kV高频瓷片电容。The freewheeling circuit includes D1, R2 and C4. The D1 is an ultra-fast diode MUR160, R2 is a 10K/1W resistor, and C4 is a 102/1kV high-frequency ceramic capacitor.
所述整流输出电路包括单向整流电路和滤波输出电路，所述滤波输出电路包括L4、L5、C6、C7、C8、C9，所述L4和L5为6.8uH磁棒电感，所述C6和C7为470uF/16V电解电容，所述C8、C9为220uF/35V电解电容。The rectification output circuit includes a unidirectional rectification circuit and a filter output circuit, the filter output circuit includes L4, L5, C6, C7, C8, C9, the L4 and L5 are 6.8uH magnetic rod inductance, the C6 and C7 It is a 470uF/16V electrolytic capacitor, and the C8 and C9 are 220uF/35V electrolytic capacitors.
本实用新型的有益效果是：The beneficial effects of the utility model are:
1、本实用新型其拓扑结构采用反激式，省去了脉冲变压器的一个电源次级绕组，使得电源的设计电路更加简化，同时具有多路输出，与传统开关电源设计不同。1. The topology of the utility model adopts the flyback type, which saves a power supply secondary winding of the pulse transformer, which makes the design circuit of the power supply more simplified, and has multiple outputs at the same time, which is different from the traditional switching power supply design.
2、本实用新型在一个单片IC上集成了一个700V的功率MOSFET、新颖的开／关控制状态机、一个自偏置的高压开关电流源、频率抖动、逐周期的电流限制及迟滞热关断电路，仅需要搭配少量阻容原件，即可和脉冲变压器配合实现基本开关电源的所有功能。2. The utility model integrates a 700V power MOSFET, a novel on/off control state machine, a self-biased high-voltage switching current source, frequency jitter, cycle-by-cycle current limit and hysteretic thermal shutdown on a single chip IC. To break the circuit, only a small amount of RC components are needed to cooperate with the pulse transformer to realize all the functions of the basic switching power supply.
3、本实用新型简化了前级PWM控制的驱动电路，主控芯片内部具有一个5.8V的自稳压电路，能够为芯片提供电源，并且提供一个1mA的输出，给反馈电路供电，从而省去了脉冲变压器的一个电源次级绕组，使得电源的设计电路更加简化。3. The utility model simplifies the driving circuit controlled by the front-stage PWM. The main control chip has a 5.8V self-regulating circuit inside, which can provide power for the chip, and provide a 1mA output to supply power to the feedback circuit, thus eliminating the need for A power secondary winding of the pulse transformer is added, which simplifies the design circuit of the power supply.
4、本实用新型降低了电源成本，使用单片的电源解决方案，大大降低了自己搭建模拟电路的器件成本，同时缩小了电源体积，电路板成本压大大缩减。4. The utility model reduces the cost of the power supply, and uses a single-chip power supply solution, which greatly reduces the device cost of building an analog circuit by oneself, and at the same time reduces the volume of the power supply, and the cost of the circuit board is greatly reduced.
5、本实用新型提高了电源的可靠性，传统电路中使用了很多诸如PWM发生器、比较器等模拟电子元件，只要有一个原件不正常，电源就无法正常工作，通过集成控制电路的思路，减少了很多模拟器件的使用，大大的降低了器件发生损坏的概率，提高了产品的可靠性能。5. The utility model improves the reliability of the power supply. Many analog electronic components such as PWM generators and comparators are used in traditional circuits. As long as one of the original components is abnormal, the power supply cannot work normally. Through the idea of integrated control circuit, The use of many analog devices is reduced, the probability of device damage is greatly reduced, and the reliability of the product is improved.
附图说明：Description of drawings:
图1为反激式微功率开关电源的结构示意图。Figure 1 is a schematic diagram of the structure of a flyback micropower switching power supply.
具体实施方式：detailed description:
实施例：参见图1。Embodiment: see Fig. 1.
反激式微功率开关电源，包括缓冲保护电路，EMC电路，整流滤波电路，PWM变送电路，整流输出电路和稳压反馈电路，缓冲保护电路、EMC电路和整流滤波电路把交流电源转化成高电平直流信号，高电平直流信号经过PWM变送电路，转化成低电压交流脉冲信号，低电压交流脉冲信号经过整流输出电路转化成直流信号，直流信号输入稳压反馈电路，并通过光耦将隔离把产生的开通/关断信号传输给开关电源控制芯片，整流输出电路具有两个输出端口。Flyback micro-power switching power supply, including buffer protection circuit, EMC circuit, rectification and filtering circuit, PWM transmission circuit, rectification output circuit and voltage regulator feedback circuit, buffer protection circuit, EMC circuit and rectification and filtering circuit to convert AC power into high voltage Flat DC signal, high-level DC signal is converted into low-voltage AC pulse signal through PWM transmission circuit, low-voltage AC pulse signal is converted into DC signal through rectified output circuit, and DC signal is input into voltage-stabilizing feedback circuit The isolation transmits the generated on/off signal to the switching power supply control chip, and the rectification output circuit has two output ports.
缓冲保护电路包括RQ1和MOV1，RQ1为辅温度系数电阻，且型号为MT72-10D7，MOV1为压敏电阻，且型号为14D471K。The buffer protection circuit includes RQ1 and MOV1, RQ1 is an auxiliary temperature coefficient resistor, and the model is MT72-10D7, and MOV1 is a piezoresistor, and the model is 14D471K.
EMC电路包括L1、C1，L1为5.6mH/1A的环形共模电感，所述C1为0.1uF/275V的X1型安规电容。The EMC circuit includes L1 and C1. L1 is a 5.6mH/1A annular common-mode inductor, and the C1 is a 0.1uF/275V X1 type safety capacitor.
整流滤波电路包括DB1、L2-3、C2-3，DB1为GBP08(2A、800V)型整流桥，L2-3为1mH/1A型工型电感，C2-3为6.8uF/450V型电解电容，稳压反馈电路包括TL431、反馈光耦和外围电路。The rectification filter circuit includes DB1, L2-3, C2-3, DB1 is a GBP08 (2A, 800V) type rectifier bridge, L2-3 is a 1mH/1A type I-type inductor, C2-3 is a 6.8uF/450V type electrolytic capacitor, The regulator feedback circuit includes TL431, feedback optocoupler and peripheral circuits.
PWM变送电路包括主控芯片、脉冲变压器和续流电路，主控芯片型号为LNK364，脉冲变压器为EE16磁芯、材料为PC47、初级绕组为87匝的变压器，且两个次级输出端口的匝数为6匝和14匝。The PWM transmission circuit includes a main control chip, a pulse transformer and a freewheeling circuit. The model of the main control chip is LNK364, the pulse transformer is a transformer with EE16 magnetic core, the material is PC47, the primary winding is 87 turns, and the two secondary output ports The number of turns is 6 turns and 14 turns.
续流电路包括D1、R2和C4，D1为超快速二极管MUR160、R2为10K/1W电阻、C4为102/1kV高频瓷片电容。The freewheeling circuit includes D1, R2 and C4. D1 is an ultra-fast diode MUR160, R2 is a 10K/1W resistor, and C4 is a 102/1kV high-frequency ceramic capacitor.
整流输出电路包括单向整流电路和滤波输出电路，滤波输出电路包括L4、L5、C6、C7、C8、C9，所述L4和L5为6.8uH磁棒电感，C6和C7为470uF/16V电解电容，C8、C9为220uF/35V电解电容。The rectification output circuit includes a one-way rectification circuit and a filter output circuit. The filter output circuit includes L4, L5, C6, C7, C8, and C9. The L4 and L5 are 6.8uH magnetic rod inductance, and C6 and C7 are 470uF/16V electrolytic capacitors , C8 and C9 are 220uF/35V electrolytic capacitors.
缓冲保护电路中RQ1主要用于缓冲开关电源上电瞬间电容充电电流，对电容起到保护作用，MOV1防止雷击等情况发生时的差模干扰，当有差模高电压进来的时候，其与RQ1共同形成一个电阻稳压电路将差模高电压信号滤除。In the buffer protection circuit, RQ1 is mainly used to buffer the charging current of the capacitor at the moment of power-on of the switching power supply, and protect the capacitor. MOV1 prevents differential-mode interference when lightning strikes and other situations occur. When there is a differential-mode high voltage coming in, it and RQ1 Together they form a resistor voltage regulator circuit to filter out differential mode high voltage signals.
EMC电路提高电源的电磁兼容性能，其中L1和C1组合成为一个低通滤波电路，从而衰减外部差/共模高频干扰对电源性能的影响。The EMC circuit improves the electromagnetic compatibility performance of the power supply, where L1 and C1 are combined to form a low-pass filter circuit, thereby attenuating the influence of external differential/common-mode high-frequency interference on the performance of the power supply.
PWM变送电路的主控芯片（LNK364）内部包含一个700V的MOSFET及其控制器，其内部连接到漏极的高压电流源在启动阶段提供偏置电流，从而省去了外部启动电路，内部集成的振荡器能够给MOSFET提供132kHz的输出脉冲，主控芯片通过控制内部的开关管不断的开通关断，将上级输出的高压直流信号转化成132kHz的脉冲信号，当开关管开通的时候，脉冲变压器的初级内流动的电流增加，达到峰值Ip，当开关管关断的时候，反激电压使输出二极管进入导通状态，同时初级线圈存储的能量为1/2LI^2传递到次级，提供负载电流，同时给输出电容充电，通过电压反馈电路可以调节初级脉冲的占空比来调节Ip的大小，从而起到稳压输出的作用，同时D1、R2和C4共同组成续流电路，防止开关管关断的时候变压器初级产生瞬间反向高压烧坏开关管。The main control chip (LNK364) of the PWM transmission circuit contains a 700V MOSFET and its controller. The high-voltage current source connected to the drain provides bias current during the start-up phase, thus eliminating the need for an external start-up circuit. The internal integration The oscillator can provide 132kHz output pulses to the MOSFET. The main control chip converts the high-voltage DC signal output by the upper stage into a 132kHz pulse signal by controlling the internal switch tube to turn on and off continuously. When the switch tube is turned on, the pulse transformer The current flowing in the primary increases and reaches the peak value Ip. When the switch is turned off, the flyback voltage makes the output diode enter the conduction state. At the same time, the energy stored in the primary coil is 1/2LI^2 transferred to the secondary, providing the load Current, while charging the output capacitor, through the voltage feedback circuit, the duty cycle of the primary pulse can be adjusted to adjust the size of Ip, so as to play the role of stabilizing the output. At the same time, D1, R2 and C4 together form a freewheeling circuit to prevent the switching tube from When the transformer is turned off, the primary side of the transformer generates an instantaneous reverse high voltage and burns out the switch tube.
整流输出电路的单向整流电路主要是利用二极管的单向导通能力，当一次关断期间，次级整流二极管导通，将铁心中存储的磁能释放，再经过滤波输出电路输出稳定直流电压。The unidirectional rectification circuit of the rectification output circuit mainly utilizes the unidirectional conduction ability of the diode. During a turn-off period, the secondary rectification diode conducts to release the magnetic energy stored in the iron core, and then outputs a stable DC voltage through the filter output circuit.
稳压反馈电路，当输出电压达到5V的时候，U2导通，U1内的MOSFET关断，直到下一个开关周期的到来，U2选用PC817，R7=R9=10K，R6=150R，R8=1K，C=102。Voltage regulator feedback circuit, when the output voltage reaches 5V, U2 is turned on, and the MOSFET in U1 is turned off until the next switching cycle arrives. U2 uses PC817, R7=R9=10K, R6=150R, R8=1K, C=102.
以上所述，仅是本实用新型的较佳实施例而已，并非对本实用新型作任何形式上的限制，凡是依据本实用新型的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本实用新型技术方案的范围内。The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, All still belong to within the scope of the technical solution of the utility model.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520651862.0UCN205081684U (en) | 2015-08-27 | 2015-08-27 | Turn over and swash power switching power supply that declines |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520651862.0UCN205081684U (en) | 2015-08-27 | 2015-08-27 | Turn over and swash power switching power supply that declines |
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| CN205081684Utrue CN205081684U (en) | 2016-03-09 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520651862.0UExpired - Fee RelatedCN205081684U (en) | 2015-08-27 | 2015-08-27 | Turn over and swash power switching power supply that declines |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680676A (en)* | 2016-03-18 | 2016-06-15 | 宁波三星医疗电气股份有限公司 | Switching power supply output circuit |
| CN105703639A (en)* | 2016-04-25 | 2016-06-22 | 崔艳群 | Power supply apparatus for green light source |
| CN105939119A (en)* | 2016-07-01 | 2016-09-14 | 温州市逸达科技有限公司 | Power supply circuit of electric sewing machine |
| CN109245568A (en)* | 2018-09-12 | 2019-01-18 | 杭州海兴电力科技股份有限公司 | A kind of exchange turns direct-current isolating switch power circuit |
| CN109388207A (en)* | 2018-10-31 | 2019-02-26 | 广东迅扬科技股份有限公司 | Water-cooled computer host |
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105680676A (en)* | 2016-03-18 | 2016-06-15 | 宁波三星医疗电气股份有限公司 | Switching power supply output circuit |
| CN105703639A (en)* | 2016-04-25 | 2016-06-22 | 崔艳群 | Power supply apparatus for green light source |
| CN105939119A (en)* | 2016-07-01 | 2016-09-14 | 温州市逸达科技有限公司 | Power supply circuit of electric sewing machine |
| CN109245568A (en)* | 2018-09-12 | 2019-01-18 | 杭州海兴电力科技股份有限公司 | A kind of exchange turns direct-current isolating switch power circuit |
| CN109245568B (en)* | 2018-09-12 | 2024-05-24 | 杭州海兴电力科技股份有限公司 | Alternating current-to-direct current isolation switch power supply circuit |
| CN109388207A (en)* | 2018-10-31 | 2019-02-26 | 广东迅扬科技股份有限公司 | Water-cooled computer host |
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| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20160309 | |
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