CN110677050A - Power control circuit of switching power supply - Google Patents
Power control circuit of switching power supply Download PDFInfo
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- CN110677050A CN110677050A CN201911062868.3A CN201911062868A CN110677050A CN 110677050 A CN110677050 A CN 110677050A CN 201911062868 A CN201911062868 A CN 201911062868A CN 110677050 A CN110677050 A CN 110677050A
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- 239000003990 capacitor Substances 0.000 claims abstract description 42
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000005669 field effect Effects 0.000 claims description 12
- 230000021615 conjugation Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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Abstract
本发明提出一种开关电源功率控制电路，有效控制电源输出的稳定性，其包括电源输入部分、升压变压部分和功率输出部分，所述升压变压部分包括变压器，该变压器的原级侧连接电源输入部分，其副级侧连接功率输出部分，其特征在于：还包括检测反馈部分，所述检测反馈部分连接于变压器的副级侧，用于同步反馈输出功率超限信息至MCU处理器，所述MCU处理器连接并控制功率放大器，其响应所述功率超限信息以对功率放大器的输出功率实现控制。本发明增加了由二极管D9、电容C2、光耦单元U3、可控稳压管U5等器件构成的检测反馈部分线路，其中二极管D9整流出来的VDD电压会随着VCC端的负载越重电压越高，本申请正就是利用这个特性来实现功率控制。
The present invention proposes a switching power supply power control circuit, which can effectively control the stability of the power supply output. The side is connected to the power input part, the secondary side is connected to the power output part, and it is characterized in that: it also includes a detection feedback part, the detection feedback part is connected to the secondary side of the transformer, and is used for synchronously feeding back the output power over-limit information to the MCU for processing The MCU processor is connected to and controls the power amplifier, which responds to the power overrun information to control the output power of the power amplifier. The present invention adds a detection and feedback part circuit composed of diode D9, capacitor C2, optocoupler unit U3, controllable voltage regulator tube U5 and other devices, wherein the VDD voltage rectified by diode D9 will increase with the heavier load of the VCC terminal. , and the present application utilizes this characteristic to realize power control.
Description
技术领域technical field
本发明应用于音响电源，具体涉及一种开关电源功率控制电路。The invention is applied to an audio power supply, in particular to a power control circuit of a switching power supply.
背景技术Background technique
现在很多音响都使用开关电源，开关电源比普通的EI或者环型变压有很多优点，如体积小，电压稳定等，但也有缺点，干扰大过载能力不好。开关电源用在音响上面最大的问题是功率变化带来的冲击，由于声音的变化大，引起电流变化也跟着变化，这时开关电源的场效应管从轻载到重载不停的切换，很容易损坏，或者触发保护，自动关闭电源输出，造成断音杂音等现象。Nowadays, many audio systems use switching power supplies. Compared with ordinary EI or ring transformers, switching power supplies have many advantages, such as small size and stable voltage, but they also have disadvantages, such as large interference and poor overload capacity. The biggest problem of switching power supply used in audio is the impact caused by power change. Due to the large change in sound, the current change also changes. At this time, the FET of the switching power supply is constantly switching from light load to heavy load. It is easy to be damaged, or trigger the protection, automatically turn off the power output, resulting in the phenomenon of sound and noise.
发明内容SUMMARY OF THE INVENTION
为克服现有技术中存在的问题，本发明提出一种开关电源功率控制电路，有效控制电源输出的稳定性，其具体技术内容如下：In order to overcome the problems existing in the prior art, the present invention proposes a switching power supply power control circuit, which can effectively control the stability of the power supply output, and its specific technical contents are as follows:
一种开关电源功率控制电路，包括电源输入部分、升压变压部分和功率输出部分，所述升压变压部分包括变压器，该变压器的原级侧连接电源输入部分，其副级侧连接功率输出部分，其还包括检测反馈部分，所述检测反馈部分连接于变压器的副级侧，用于同步反馈输出功率超限信息至MCU处理器，所述MCU处理器连接并控制功率放大器，其响应所述功率超限信息以对功率放大器的输出功率实现控制。A switching power supply power control circuit includes a power input part, a step-up transformer part and a power output part, the step-up transformer part includes a transformer, the primary side of the transformer is connected to the power input part, and the secondary side of the transformer is connected to the power The output part also includes a detection feedback part, the detection feedback part is connected to the secondary side of the transformer, and is used for synchronously feeding back the output power over-limit information to the MCU processor, the MCU processor is connected to and controls the power amplifier, and its response The power over-limit information is used to control the output power of the power amplifier.
于本发明的一个或多个实施例当中，所述检测反馈部分包括二极管D9、电容C2、光耦单元U3、可控稳压管U5以及若干电阻，所述二极管D9与变压器的第二副级线圈取电，其阴极经电阻R4和R16接地；所述光耦单元U3的输入脚1连接二极管D9的阴极，其输入脚2经可控稳压管U5接地，其输出脚3接地，其输出脚4连接至 MCU处理器；所述可控稳压管U5的控制极连接至电阻R4和R16的连接点；所述电容C2接于二极管D9的阴极与地端之间。In one or more embodiments of the present invention, the detection and feedback part includes a diode D9, a capacitor C2, an optocoupler unit U3, a controllable voltage regulator tube U5, and several resistors. The diode D9 is connected to the second secondary stage of the transformer. The coil is powered, and its cathode is grounded through resistors R4 and R16; the
于本发明的一个或多个实施例当中，所述升压变压部分包括PWM控制芯片、场效应管Q1、二极管D8、光耦单元U1、电容C1、C10 和C23、可控稳压管U2以及若干电阻，所述PWM控制芯片的输出端经电阻R14连接至场效应管Q1的栅极，所述场效应管Q1的源极连接至变压器的原级线圈，其漏极接地，且其源极和漏极之间连接有电容 C23；所述电阻R14与二极管D8并联，且二极管D8的阳极连接场效应管Q1的栅极；电阻R3、R5和可控稳压管U2依次串联接于功率输出部分与地端之间，电阻R1和R2串联接于功率输出部分与地端之间，电容C1和电阻R6串联后一端连接电阻R5和可控稳压管U2的连接点，另一端连接电阻R1和R2的连接点，所述可控稳压管U2的控制极连接至电阻R1和R2的连接点；所述光耦单元U1的输入侧连接于电阻 R5的两端，其输出侧反馈连接至PWM控制芯片。In one or more embodiments of the present invention, the boosting and transforming part includes a PWM control chip, a field effect transistor Q1, a diode D8, an optocoupler unit U1, capacitors C1, C10 and C23, and a controllable voltage regulator U2. and a number of resistors, the output end of the PWM control chip is connected to the gate of the field effect transistor Q1 through the resistor R14, the source electrode of the field effect transistor Q1 is connected to the primary coil of the transformer, its drain is grounded, and its source A capacitor C23 is connected between the pole and the drain; the resistor R14 is connected in parallel with the diode D8, and the anode of the diode D8 is connected to the gate of the field effect transistor Q1; the resistors R3, R5 and the controllable voltage regulator U2 are connected in series to the power Between the output part and the ground terminal, the resistors R1 and R2 are connected in series between the power output part and the ground terminal, the capacitor C1 and the resistor R6 are connected in series, and one end is connected to the connection point of the resistor R5 and the controllable voltage regulator tube U2, and the other end is connected to the resistor The connection point of R1 and R2, the control electrode of the controllable voltage regulator tube U2 is connected to the connection point of the resistors R1 and R2; the input side of the optocoupler unit U1 is connected to both ends of the resistor R5, and the output side is connected to the feedback to the PWM control chip.
于本发明的一个或多个实施例当中，所述电源输入部分包括共扼电感LF1，由二极管D1-D4构成的整流桥，以及电解电容EC1，所述共扼电感LF1的输入端接有滤波电容CX1和压敏电阻ZVR1，其输出端连接整流桥，所述整流桥的输出端连接至升压变压电路且接电解电容EC1，电阻R21和R28串联后接至共扼电感LF1的输入端，电阻R32和R33串联后接至共扼电感LF1的输入端。In one or more embodiments of the present invention, the power input part includes a condensed inductor LF1, a rectifier bridge formed by diodes D1-D4, and an electrolytic capacitor EC1, and the input end of the condensed inductor LF1 is connected to a filter. Capacitor CX1 and varistor ZVR1, the output end of which is connected to the rectifier bridge, the output end of the rectifier bridge is connected to the step-up transformer circuit and is connected to the electrolytic capacitor EC1, and the resistors R21 and R28 are connected in series to the input end of the conjugation inductor LF1 , the resistors R32 and R33 are connected in series to the input of the condensed inductor LF1.
于本发明的一个或多个实施例当中，所述电源输入部的的输出端经由电阻R30、R21和电解电容EC7接地。In one or more embodiments of the present invention, the output terminal of the power input part is grounded through resistors R30, R21 and electrolytic capacitor EC7.
于本发明的一个或多个实施例当中，所述功率输出部分包括二极管D13、电解电容EC2和EC4、电感L2和滤波电容C6，所述二极管D13阳极连接变压器的第一副级线圈，其阴极连接电感L2作为功率输出部分的输出并输出端接有滤波电容C6，所述电感L2两端分别接有所述电解电容EC2和EC4。In one or more embodiments of the present invention, the power output part includes a diode D13, electrolytic capacitors EC2 and EC4, an inductor L2 and a filter capacitor C6. The anode of the diode D13 is connected to the first secondary coil of the transformer, and the cathode of the diode D13 is connected to the first secondary coil of the transformer. The inductor L2 is connected as the output of the power output part, and the output terminal is connected with a filter capacitor C6, and the two ends of the inductor L2 are respectively connected with the electrolytic capacitors EC2 and EC4.
本发明的有益效果是：增加了由二极管D9、电容C2、光耦单元 U3、可控稳压管U5等器件构成的检测反馈部分线路，其中二极管D9 整流出来的VDD电压会随着VCC端的负载越重电压越高，本申请正就是利用这个特性来实现功率控制。首先，正常工作时，VDD的电压是12V左右，经电阻R4和R16分压给可控稳压管U5的控制端，此时可控稳压管U5的控制端是2V左右。当输出端负载增大，VDD电压随之升高，VDD升高到15V时，此时经分压电阻R4、R16得出可控稳压管 U5的控制端为2.5V，达到比较器反转限值，可控稳压管U5比较器反转，光耦单元U3导通以实现将连接至MCU处理器的DET端电平拉低； MCU处理器检测到DET端变低电压后，发出一个降功率的指令给功率放大器AMP作相应降功率，以减轻电源的负荷，达到稳定电源功率的效果。The beneficial effect of the present invention is that a detection and feedback part circuit composed of devices such as diode D9, capacitor C2, optocoupler unit U3, and controllable voltage regulator tube U5 is added, wherein the VDD voltage rectified by diode D9 will follow the load of the VCC terminal. The heavier the voltage, the higher the voltage, and the present application utilizes this feature to realize power control. First of all, during normal operation, the voltage of VDD is about 12V, which is divided by resistors R4 and R16 to the control terminal of the controllable voltage regulator U5. At this time, the control terminal of the controllable voltage regulator U5 is about 2V. When the load of the output terminal increases, the VDD voltage increases accordingly, and when VDD rises to 15V, the control terminal of the controllable voltage regulator tube U5 is 2.5V through the voltage dividing resistors R4 and R16 at this time, and the inversion of the comparator is achieved. The limit value, the comparator of the controllable voltage regulator tube U5 is reversed, and the optocoupler unit U3 is turned on to pull down the level of the DET terminal connected to the MCU processor; after the MCU processor detects that the DET terminal has become low voltage, it sends a The power-reduction command reduces the power of the power amplifier AMP accordingly, so as to reduce the load of the power supply and achieve the effect of stabilizing the power of the power supply.
附图说明Description of drawings
图1为本发明的开关电源功率控制电路的原理图。FIG. 1 is a schematic diagram of a switching power supply power control circuit of the present invention.
图2为本发明的MCU处理器和功率放大器的原理图。FIG. 2 is a schematic diagram of the MCU processor and the power amplifier of the present invention.
图3为本发明的检测反馈部分的原理图。FIG. 3 is a schematic diagram of the detection feedback part of the present invention.
图4为本发明的升压变压部分的原理图。FIG. 4 is a schematic diagram of the step-up transformer part of the present invention.
图5为本发明的电源输入部分的原理图。FIG. 5 is a schematic diagram of the power input part of the present invention.
图6为本发明的功率输出部分的原理图。FIG. 6 is a schematic diagram of the power output part of the present invention.
具体实施方式Detailed ways
如下结合附图，对本申请方案作进一步描述：Below in conjunction with accompanying drawing, the application scheme is further described:
参见附图1和2，一种开关电源功率控制电路，包括电源输入部分1、升压变压部分2和功率输出部分3，所述升压变压部分2包括变压器，该变压器的原级侧连接电源输入部分，其副级侧连接功率输出部分，其还包括检测反馈部分4，所述检测反馈部分4连接于变压器的副级侧，用于同步反馈输出功率超限信息至MCU处理器，所述 MCU处理器连接并控制功率放大器AMP，其响应所述功率超限信息以对功率放大器AMP的输出功率实现控制。Referring to Figures 1 and 2, a switching power supply power control circuit includes a
参见附图3，所述检测反馈部分4包括二极管D9、电容C2、光耦单元U3、可控稳压管U5以及若干电阻，所述二极管D9与变压器的第二副级线圈取电，其阴极经电阻R4和R16接地；所述光耦单元 U3的输入脚1连接二极管D9的阴极，其输入脚2经可控稳压管U5 接地，其输出脚3接地，其输出脚4连接至MCU处理器；所述可控稳压管U5的控制极连接至电阻R4和R16的连接点；所述电容C2接于二极管D9的阴极与地端之间。Referring to FIG. 3 , the
参见附图4，所述升压变压部分2包括PWM控制芯片、场效应管 Q1、二极管D8、光耦单元U1、电容C1、C10和C23、可控稳压管U2 以及若干电阻，所述PWM控制芯片的输出端经电阻R14连接至场效应管Q1的栅极，所述场效应管Q1的源极连接至变压器的原级线圈，其漏极接地，且其源极和漏极之间连接有电容C23；所述电阻R14与二极管D8并联，且二极管D8的阳极连接场效应管Q1的栅极；电阻R3、 R5和可控稳压管U2依次串联接于功率输出部分与地端之间，电阻R1 和R2串联接于功率输出部分与地端之间，电容C1和电阻R6串联后一端连接电阻R5和可控稳压管U2的连接点，另一端连接电阻R1和 R2的连接点，所述可控稳压管U2的控制极连接至电阻R1和R2的连接点；所述光耦单元U1的输入侧连接于电阻R5的两端，其输出侧反馈连接至PWM控制芯片。Referring to FIG. 4, the boosting and transforming
参见附图5，所述电源输入部分1包括共扼电感LF1，由二极管 D1-D4构成的整流桥，以及电解电容EC1，所述共扼电感LF1的输入端接有滤波电容CX1和压敏电阻ZVR1，其输出端连接整流桥，所述整流桥的输出端连接至升压变压电路且接电解电容EC1，电阻R21和R28串联后接至共扼电感LF1的输入端，电阻R32和R33串联后接至共扼电感LF1的输入端。所述电源输入部的1的输出端经由电阻R30、 R21和电解电容EC7接地，电阻R4连接至电解电容EC7以获取偏置电压。Referring to FIG. 5 , the
参见附图6，所述功率输出部分3包括二极管D13、电解电容EC2 和EC4、电感L2和滤波电容C6，所述二极管D13阳极连接变压器的第一副级线圈，其阴极连接电感L2作为功率输出部分的输出并输出端接有滤波电容C6，所述电感L2两端分别接有所述电解电容EC2和EC4。Referring to FIG. 6, the
工作原理：working principle:
变压器第二副级圈线(绕组4-5脚)是集成电路的VDD供电电压，二极管D9整流出来的VDD电压会随着VCC端的负载越重电压越高，本申请正就是利用这个特性来实现功率控制。首先，正常工作时，VDD 的电压是12V左右，经电阻R4和R16分压给可控稳压管U5的控制端，此时可控稳压管U5(器件型号是TL431)的控制端是2V左右。当输出端负载增大，VDD电压随之升高，VDD升高到15V时，此时经分压电阻R4、R16得出可控稳压管U5的控制端为2.5V，达到比较器反转限值，可控稳压管U5比较器反转，光耦单元U3(器件型号是EL817) 导通以实现将连接至MCU处理器的DET端电平拉低；MCU处理器检测到DET端变低电压后，发出一个降功率的指令给功率放大器AMP作相应降功率，以减轻电源的负荷，达到稳定电源功率的效果上述优选实施方式应视为本申请方案实施方式的举例说明，凡与本申请方案雷同、近似或以此为基础作出的技术推演、替换、改进等，均应视为本专利的保护范围。The second secondary coil of the transformer (pins 4-5 of the winding) is the VDD supply voltage of the integrated circuit. The VDD voltage rectified by the diode D9 will increase with the heavier load of the VCC terminal. This application uses this feature to achieve Power Control. First of all, during normal operation, the voltage of VDD is about 12V, which is divided by resistors R4 and R16 to the control terminal of the controllable voltage regulator U5. At this time, the control terminal of the controllable voltage regulator U5 (device model is TL431) is 2V about. When the load of the output terminal increases, the VDD voltage increases accordingly, and when VDD rises to 15V, the control terminal of the controllable voltage regulator tube U5 is 2.5V through the voltage dividing resistors R4 and R16 at this time, and the inversion of the comparator is achieved. The limit value, the comparator of the controllable voltage regulator tube U5 is reversed, and the optocoupler unit U3 (device model is EL817) is turned on to pull down the level of the DET terminal connected to the MCU processor; the MCU processor detects that the DET terminal changes. After the voltage is low, a power reduction command is issued to the power amplifier AMP to reduce the power accordingly, so as to reduce the load of the power supply and achieve the effect of stabilizing the power supply. Technical deductions, substitutions, improvements, etc., which are identical or similar to or based on the application scheme, shall be regarded as the protection scope of this patent.
Claims (6)
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| CN201911062868.3A CN110677050A (en) | 2019-11-04 | 2019-11-04 | Power control circuit of switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112074035A (en) * | 2020-09-21 | 2020-12-11 | 广东类恒星科技影视工业有限公司 | A power supply control circuit applied to multi-primary color video lights |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020057081A1 (en) * | 2000-11-10 | 2002-05-16 | Delta Electronics, Inc. | Method and circuit for detecting light load mode of switching power supply system |
| CN201365202Y (en) * | 2009-01-19 | 2009-12-16 | 嘉兴天音电子有限公司 | High-power audio switch power supply |
| CN203435135U (en) * | 2013-09-09 | 2014-02-12 | 深圳利能达实业有限公司 | Power amplifier system and switching power supply and sound box thereof |
| CN104753368A (en) * | 2015-04-03 | 2015-07-01 | 深圳市泰金田科技有限公司 | Stereo switch power source |
| CN208077157U (en) * | 2018-04-25 | 2018-11-09 | 西安Tcl软件开发有限公司 | Usb adapter adaptive circuit and terminal device |
| CN210867514U (en) * | 2019-11-04 | 2020-06-26 | 中山市悦辰电子实业有限公司 | Power control circuit of switching power supply |
-
2019
- 2019-11-04 CN CN201911062868.3A patent/CN110677050A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020057081A1 (en) * | 2000-11-10 | 2002-05-16 | Delta Electronics, Inc. | Method and circuit for detecting light load mode of switching power supply system |
| CN201365202Y (en) * | 2009-01-19 | 2009-12-16 | 嘉兴天音电子有限公司 | High-power audio switch power supply |
| CN203435135U (en) * | 2013-09-09 | 2014-02-12 | 深圳利能达实业有限公司 | Power amplifier system and switching power supply and sound box thereof |
| CN104753368A (en) * | 2015-04-03 | 2015-07-01 | 深圳市泰金田科技有限公司 | Stereo switch power source |
| CN208077157U (en) * | 2018-04-25 | 2018-11-09 | 西安Tcl软件开发有限公司 | Usb adapter adaptive circuit and terminal device |
| CN210867514U (en) * | 2019-11-04 | 2020-06-26 | 中山市悦辰电子实业有限公司 | Power control circuit of switching power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112074035A (en) * | 2020-09-21 | 2020-12-11 | 广东类恒星科技影视工业有限公司 | A power supply control circuit applied to multi-primary color video lights |
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