TW201318323A - An power supply having electromagnetic wave suppression circuit - Google Patents
An power supply having electromagnetic wave suppression circuit Download PDFInfo
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- TW201318323A TW201318323A TW100139032A TW100139032A TW201318323A TW 201318323 A TW201318323 A TW 201318323A TW 100139032 A TW100139032 A TW 100139032A TW 100139032 A TW100139032 A TW 100139032A TW 201318323 A TW201318323 A TW 201318323A
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Abstract
Description
本發明是有關於一種電源供應器重載或過載時電磁波的改善之電路設計。The present invention relates to a circuit design for improving electromagnetic waves when a power supply is heavily loaded or overloaded.
目前的交換式電源供應器大多採用脈衝寬度調變(PWM)的型式來控制做為開關的功率電晶體。如圖1所示，一般最常用的方式是直接在PWM控制IC的驅動接腳上串連兩顆電阻Rg1及Rg2，並於單顆電阻上並聯一二極體後，連接於待驅動功率電晶體Q1。Current switching power supplies mostly use a pulse width modulation (PWM) type to control the power transistors that act as switches. As shown in Figure 1, the most common way is to connect two resistors Rg1 and Rg2 directly on the drive pin of the PWM control IC, and connect a diode to a single resistor to connect to the power to be driven. Crystal Q1.
此線路連接方式雖結構簡單，容易設定功率電晶體Q1之驅動曲線，但其具有該驅動曲線一旦設定即無法隨意變更之缺點。交換式電源供應器系統若電壓或電流快速變化，即易造成大量雜訊，形成電磁輻射干擾，因此若能降低系統中電壓或電流快速變動的情形即能減少電磁輻射干擾的產生，進而改善系統電磁波的特性。Although the line connection method is simple in structure, it is easy to set the driving curve of the power transistor Q1, but it has the disadvantage that the driving curve cannot be arbitrarily changed once it is set. If the voltage or current of the switching power supply system changes rapidly, it will easily cause a lot of noise and form electromagnetic radiation interference. Therefore, if the voltage or current in the system can be quickly changed, the electromagnetic radiation interference can be reduced, and the system can be improved. The characteristics of electromagnetic waves.
為解決上述問題，本發明提供一種電源供應器之電磁波抑制電路，其包含一整流裝置，用以將交流電源整流成直流電源；一變壓器，用以傳輸經該整流裝置整流後的直流電源，從該變壓裝置之一次側繞組傳輸至二次側繞組；一輸出電路，用以將該二次側繞組之直流電源，輸出至負載裝置；一第一開關裝置，連接於該一次側繞組；一控制單元，用以控制該第一開關裝置之觸發電壓準位；一迴授電路，用以反應負載變化，並迴授於控制單元，其一端耦接於該輸出電路，另一端耦接於該控制單元；其中，該控制單元包含：一脈衝寬度調變控制裝置；一電壓準位偵測裝置，其偶接於該脈衝寬度調變控制裝置；一功率電晶體充放電曲線控制裝置，其分別偶接於脈衝寬度調變控制裝置與脈衝寬度調變控制裝置。In order to solve the above problems, the present invention provides an electromagnetic wave suppression circuit for a power supply, comprising a rectifying device for rectifying an alternating current power source into a direct current power source, and a transformer for transmitting a direct current power source rectified by the rectifying device. The primary winding of the transformer device is transmitted to the secondary winding; an output circuit is configured to output the DC power of the secondary winding to the load device; a first switching device is connected to the primary winding; a control unit for controlling the trigger voltage level of the first switching device; a feedback circuit for reacting to the load change and being fed back to the control unit, one end of which is coupled to the output circuit, and the other end of which is coupled to the a control unit, wherein the control unit comprises: a pulse width modulation control device; a voltage level detection device coupled to the pulse width modulation control device; and a power transistor charge and discharge curve control device, respectively It is coupled to the pulse width modulation control device and the pulse width modulation control device.
本發明係為一種藉由電路設計實現可有效改善重載或過載時電磁波特性之電路。The present invention is a circuit that can effectively improve electromagnetic wave characteristics under heavy load or overload by circuit design.
如圖2所示，為本發明電源供應器之電磁波抑制電路之具體實施例。該電磁波抑制電路包含，整流裝置212、變壓器T1、輸出電路204、第一開關裝置Q1、迴授電路206、以及控制單元22。其中該整流裝置212，用來將輸入的交流電源整流為直流電源；該變壓器T1用來傳輸經由該整流裝置212整流後的直流電源，從該變壓器T1的一次側繞組傳輸到二次側繞組，然後經由輸出電路204輸出到負載裝置；第一開關裝置Q1可以是功率電晶體，分別一端連接於變壓器T1一次測繞組，另一端連接於控制單元22；該迴授電路206一端連接於輸出電路204，另一端連接於控制單元22。As shown in FIG. 2, it is a specific embodiment of the electromagnetic wave suppression circuit of the power supply of the present invention. The electromagnetic wave suppression circuit includes a rectifying device 212, a transformer T1, an output circuit 204, a first switching device Q1, a feedback circuit 206, and a control unit 22. The rectifying device 212 is configured to rectify the input AC power to a DC power source; the transformer T1 is configured to transmit a DC power rectified by the rectifying device 212, and is transmitted from the primary winding of the transformer T1 to the secondary winding. Then, the output device 204 outputs the power to the load device. The first switch device Q1 can be a power transistor. One end is connected to the transformer T1 and the other end is connected to the control unit 22. The other end of the feedback circuit 206 is connected to the output circuit 204. The other end is connected to the control unit 22.
控制單元22包含脈衝寬度調變(PWM)控制裝置222、電壓準位偵測裝置226以及功率電晶體充放電曲線控制裝置224。電壓準位偵測裝置226之一端連接於PWM控制裝置222，另一端連接於功率電晶體充放電曲線控制裝置224；功率電晶體充放電曲線控制裝置224之一端分別連接於開關裝置Q1以及PWM控制裝置222。The control unit 22 includes a pulse width modulation (PWM) control device 222, a voltage level detecting device 226, and a power transistor charge and discharge curve control device 224. One end of the voltage level detecting device 226 is connected to the PWM control device 222, and the other end is connected to the power transistor charging and discharging curve control device 224; one end of the power transistor charging and discharging curve control device 224 is respectively connected to the switching device Q1 and the PWM control Device 222.
電壓準位偵測裝置226包含二極體Dp1、第一電阻Rp2、第二電阻Rp3以及第一電容Cp2。功率電晶體充放電曲線控制裝置224包含第二電容Cp3、第三電阻Rp4以及第二開關裝置Q2，其中該第二開關裝置可以是功率電晶體。第一電阻Rp2串聯第二電阻Rp3，該第二電阻Rp3並聯第一電容Cp2，該第二電阻Rp3的一端分別連接於第一電阻Rp2以及第二開關裝置Q2，二極體Dp1一端連接於第一電阻Rp2，另一端連接於PWM控制裝置222。第二電容Cp3並聯第三電阻Rp4，一端分別連接於PWM控制裝置222以及第一開關裝置Q1，另一端連接於第二開關裝置Q2。The voltage level detecting device 226 includes a diode Dp1, a first resistor Rp2, a second resistor Rp3, and a first capacitor Cp2. The power transistor charge and discharge curve control device 224 includes a second capacitor Cp3, a third resistor Rp4, and a second switching device Q2, wherein the second switching device can be a power transistor. The first resistor Rp2 is connected in series with the second resistor Rp3, and the second resistor Rp3 is connected in parallel with the first capacitor Cp2. One end of the second resistor Rp3 is respectively connected to the first resistor Rp2 and the second switching device Q2, and one end of the diode Dp1 is connected to the first resistor One resistor Rp2 and the other end are connected to the PWM control device 222. The second capacitor Cp3 is connected in parallel with the third resistor Rp4, one end of which is connected to the PWM control device 222 and the first switching device Q1, and the other end of which is connected to the second switching device Q2.
迴授電路206迴授了二次側的輸出能量狀況，當輕載時迴授電路206由輸出電路204迴授電壓準位訊號至一次側，使得迴授電路206二次側之光偶合器的發光元件PH1開關動作頻繁，則使得迴授至光偶合器一次側光檢測元件PH2的電壓準位較低；重載時二次側迴授電路206之發光元件PH1開關動作較不頻繁，則迴授至一次側光檢測元件PH2的電壓準位較高。依據不同的負載反應於迴授電路206之光檢測元件PH2電壓準位狀況，透過電壓準位偵測裝置226之第一電阻Rp2、第二電阻Rp3及第一電容Cp2進行分壓調整來設定功率電晶體充放電曲線控制裝置224之第二開關裝置Q2的觸發點。當電源供應系統處於重載或過載時，迴授電路206之光檢測器PH2電壓準位升高，當透過電壓準位偵測裝置226(由二極體Dp1、第一電阻Rp2、第二電阻Rp3以及第一電容Cp2所形成的分壓電路)，達到第二開關Q2的驅動觸發點時，第二開關Q2導通，則PWM控制裝置222用於驅動第一開關裝置Q1的部分能量，經由功率電晶體充放電曲線控制裝置224的第二電容Cp3洩放到地，因而改變PWM控制裝置222對第一開關裝置Q1的驅動曲線。當第二開關Q2截止時，第二電容Cp3可藉由第三電阻Rp4洩放能量，使第二開關Q2於下一次觸發導通時，能夠再次使PWM控制裝置222的觸發能量洩放。The feedback circuit 206 feedbacks the output energy state of the secondary side. When the light load is performed, the feedback circuit 206 returns the voltage level signal to the primary side by the output circuit 204, so that the optical coupler of the secondary side of the feedback circuit 206 is When the switching operation of the light-emitting element PH1 is frequent, the voltage level of the light-receiving element PH2 that is fed back to the optical coupler is low; when the light-emitting element PH1 of the secondary side feedback circuit 206 is operated at a heavy load, the switching action is less frequent, then The voltage level of the primary side light detecting element PH2 is higher. According to the different load response, the voltage detecting component PH2 of the feedback circuit 206 is in the voltage level state, and the voltage is adjusted by the first resistor Rp2, the second resistor Rp3 and the first capacitor Cp2 of the voltage level detecting device 226 to set the power. The trigger point of the second switching device Q2 of the transistor charge and discharge curve control device 224. When the power supply system is under heavy load or overload, the voltage level of the photodetector PH2 of the feedback circuit 206 rises when the voltage level detecting device 226 is transmitted (by the diode Dp1, the first resistor Rp2, and the second resistor). Rp3 and the voltage dividing circuit formed by the first capacitor Cp2), when the driving trigger point of the second switch Q2 is reached, and the second switch Q2 is turned on, the PWM control device 222 is configured to drive part of the energy of the first switching device Q1 via The second capacitor Cp3 of the power transistor charge and discharge curve control device 224 is discharged to the ground, thereby changing the driving curve of the PWM control device 222 to the first switching device Q1. When the second switch Q2 is turned off, the second capacitor Cp3 can bleed energy by the third resistor Rp4, so that the second switch Q2 can again bleed the trigger energy of the PWM control device 222 when the next trigger is turned on.
如圖3、4所示，為未採用本發明電路的實際測試情形，其測試條件是使用額定功率36w，輸出電壓12V以及輸出電流3A的交換式電源供應器，圖3是經由示波器所量測的波形，圖4是經由電磁波腔(EMI Chamber)所測得在頻率30M-300M的波形。As shown in Figures 3 and 4, in the actual test case where the circuit of the present invention is not used, the test condition is to use a switching power supply with a rated power of 36w, an output voltage of 12V, and an output current of 3A, and Figure 3 is measured by an oscilloscope. The waveform of Fig. 4 is a waveform measured at a frequency of 30M - 300M via an EMI Chamber.
如圖5、6所示，為採用本發明電路的實際測試情形，其測試條件是使用額定功率36w，輸出電壓12V以及輸出電流3A的交換式電源供應器，圖5是經由示波器所量測的波形，圖6是經由電磁波腔(EMI Chamber)所測得在頻率30M-300M的波形。As shown in Figures 5 and 6, in order to adopt the actual test situation of the circuit of the present invention, the test condition is to use an exchange power supply with a rated power of 36w, an output voltage of 12V and an output current of 3A, and Figure 5 is measured by an oscilloscope. Waveform, Figure 6 is a waveform measured at a frequency of 30M-300M via an EMI Chamber.
由上述實測試驗可明顯的看出，經由本發明的電路設計能夠使得交換式電源供應器有效的降低電磁波的干擾。It is apparent from the above-described actual test that the circuit design of the present invention enables the switching power supply to effectively reduce electromagnetic wave interference.
Rg1、Rg2．．．電阻Rg1, Rg2. . . resistance
212．．．整流裝置212. . . Rectifier
13．．．開關裝置13. . . Switching device
T1．．．變壓器T1. . . transformer
204．．．輸出電路204. . . Output circuit
19．．．脈衝寬度調變電路19. . . Pulse width modulation circuit
Q1．．．第一開關裝置Q1. . . First switching device
206．．．迴授電路206. . . Feedback circuit
22．．．控制單元twenty two. . . control unit
222．．．脈衝寬度調變控制裝置222. . . Pulse width modulation control device
224．．．功率電晶體充放電曲線控制裝置224. . . Power transistor charge and discharge curve control device
226．．．電壓準位偵測裝置226. . . Voltage level detecting device
Dp1．．．二極體Dp1. . . Dipole
Rp2．．．第一電阻Rp2. . . First resistance
Rp3．．．第二電阻Rp3. . . Second resistance
Cp2．．．第一電容Cp2. . . First capacitor
Cp3．．．第二電容Cp3. . . Second capacitor
Q2．．．第二開關裝置Q2. . . Second switching device
Rp4．．．第三電阻Rp4. . . Third resistance
PH1．．．發光元件PH1. . . Light-emitting element
PH2．．．光檢測元件PH2. . . Light detecting element
圖1係為習知電源供應器系統圖；Figure 1 is a diagram of a conventional power supply system;
圖2係為本發明電源供應器的實施例；2 is an embodiment of a power supply of the present invention;
圖3係為未採用本發明之示波器實際量測圖；Figure 3 is an actual measurement chart of an oscilloscope not using the present invention;
圖4係為未採用本發明之電磁波頻譜圖；Figure 4 is a spectrum diagram of electromagnetic waves not using the present invention;
圖5係為採用本發明之示波器實際量測圖；Figure 5 is an actual measurement chart of the oscilloscope using the present invention;
圖6係為採用本發明之電磁波頻譜圖。Fig. 6 is a diagram showing the electromagnetic spectrum of the present invention.
212．．．整流裝置212. . . Rectifier
T1．．．變壓器T1. . . transformer
204．．．輸出電路204. . . Output circuit
Q1．．．第一開關裝置Q1. . . First switching device
206．．．迴授電路206. . . Feedback circuit
22．．．控制單元twenty two. . . control unit
222．．．脈衝寬度調變控制裝置222. . . Pulse width modulation control device
224．．．功率電晶體充放電曲線控制裝置224. . . Power transistor charge and discharge curve control device
226．．．電壓準位偵測裝置226. . . Voltage level detecting device
Dp1．．．二極體Dp1. . . Dipole
Rp2．．．第一電阻Rp2. . . First resistance
Rp3．．．第二電阻Rp3. . . Second resistance
Cp2．．．第一電容Cp2. . . First capacitor
Cp3．．．第二電容Cp3. . . Second capacitor
Q2．．．第二開關裝置Q2. . . Second switching device
Rp4．．．第三電阻Rp4. . . Third resistance
PH1．．．發光元件PH1. . . Light-emitting element
PH2．．．光檢測元件PH2. . . Light detecting element
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100139032A TW201318323A (en) | 2011-10-25 | 2011-10-25 | An power supply having electromagnetic wave suppression circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100139032A TW201318323A (en) | 2011-10-25 | 2011-10-25 | An power supply having electromagnetic wave suppression circuit |
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| Publication Number | Publication Date |
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| TW201318323A true TW201318323A (en) | 2013-05-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10270351B1 (en) | 2018-01-19 | 2019-04-23 | Asian Power Devices Inc. | EMI-radiation suppression circuit |
| CN110061618A (en) * | 2018-01-18 | 2019-07-26 | 亚荣源科技（深圳）有限公司 | A kind of electromagnetic radiation suppression circuit |
-
2011
- 2011-10-25 TW TW100139032A patent/TW201318323A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061618A (en) * | 2018-01-18 | 2019-07-26 | 亚荣源科技（深圳）有限公司 | A kind of electromagnetic radiation suppression circuit |
| US10270351B1 (en) | 2018-01-19 | 2019-04-23 | Asian Power Devices Inc. | EMI-radiation suppression circuit |
| TWI662775B (en) * | 2018-01-19 | 2019-06-11 | 亞源科技股份有限公司 | Emi-radiation suppression circuit |
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