TWI514708B - Controller for controlling a power supply and control method applied to a power supply - Google Patents
Controller for controlling a power supply and control method applied to a power supply Download PDFInfo
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Description
本發明係有關於一種關於電源供應器的保護電路。 The present invention relates to a protection circuit for a power supply.
為了轉換效率以及產品體積的考量，目前許多的電源供應器都是屬於開關式電源供應器(switching mode power supply，SMPS)，控制一功率開關的導通與關閉，決定對於一電感元件的儲能與釋能，達到對負載供應所需要之規格的電源。 In order to consider conversion efficiency and product volume considerations, many power supply devices are currently switching mode power supply (SMPS), which controls the conduction and deactivation of a power switch, and determines the energy storage for an inductive component. Release the energy to the power supply required for the load supply.
舉例來說，第1圖為習知的一SMPS 10，其具有返馳式(flyback)架構。橋式整流器12對市電交流電源AC整流，在IN端提供一線電壓電源VIN，其電壓可能高達100伏特至300伏特。透過CS端，控制器18偵測跨在電流偵測電阻16的偵測信號VCS，其在功率開關15導通時，代表流經變壓器20之一次側繞組24(primary winding)的電感電流。透過GATE端來開關功率開關15，控制器18控制電感電流增加或減少。二次側繞組(secondary winding)22對於負載30提供輸出電源VOUT。輔助繞組(auxiliary winding)23對控制器18提供操作電源VCC。 For example, Figure 1 is a conventional SMPS 10 having a flyback architecture. The bridge rectifier 12 rectifies AC mains AC power and provides a line voltage supply V IN at the IN terminal, which may be as high as 100 volts to 300 volts. Through the CS terminal, the controller 18 detects the detection signal V CS across the current detecting resistor 16, which represents the inductor current flowing through the primary winding 24 of the transformer 20 when the power switch 15 is turned on. The power switch 15 is switched through the GATE terminal, and the controller 18 controls the increase or decrease of the inductor current. A secondary winding 22 provides an output power source V OUT for the load 30. An auxiliary winding 23 provides an operating power source V CC to the controller 18.
開關式電源供應器多需要有保護機制，預防一些不正常(abnormal)狀況發生。一種常見的保護稱為過電壓保護，意指輸出電源VOUT的電壓過高而反應的保護措施，可能是把開關式電源供應器中的功率開關的關閉一長段時間。 Switched power supplies require a protection mechanism to prevent some abnormal conditions from occurring. A common protection is called overvoltage protection, which means that the protection of the output power supply V OUT is too high and the protection measures may be to turn off the power switch in the switching power supply for a long time.
第2圖為一種普遍知道的過電壓保護方法。第2圖中的過電壓保 護電路形成於控制器18中。如果比較器32得知偵測操作電源VCC的電壓高過參考電壓VREF1，就可能觸發過電壓保護。但是，因為漏感(leakage inductance)的原因，操作電源VCC的電壓並不能精確的反應輸出電源VOUT的電壓。所以，第2圖的方法並不準確。 Figure 2 shows a commonly known overvoltage protection method. The overvoltage protection circuit in FIG. 2 is formed in the controller 18. If the comparator 32 knows that the voltage of the detected operating power supply V CC is higher than the reference voltage V REF1 , the overvoltage protection may be triggered. However, due to the leakage inductance, the voltage of the operating power supply V CC does not accurately reflect the voltage of the output power supply V OUT . Therefore, the method of Figure 2 is not accurate.
第3圖為另一種普遍知道的過電壓保護方法。一旦輸出電源VOUT的電壓高過基納二極體38所設定的電壓時，光耦合器(photo-coupler)36便拉低了比較器34的一輸入端的電壓，而觸發了過電壓信號SOVP。只是，第3圖需要額外增加基納二極體38以及光耦合器(photo-coupler)36，對於產品成本與體積都有不良的影響。 Figure 3 is another commonly known overvoltage protection method. Once the voltage of the output power supply V OUT is higher than the voltage set by the Zener diode 38, the photo-coupler 36 pulls down the voltage at one input of the comparator 34 and triggers the overvoltage signal S. OVP . However, Figure 3 requires an additional addition of the Kina diode 38 and the photo-coupler 36, which has a negative impact on product cost and volume.
本發明之實施例提供一種控制器，用以控制一電源供應器之一功率開關。該電源供應器提供一輸出電壓。該控制器包含有一多功能端、一時間延遲器、一過電壓偵測裝置、以及一閘控制器。該時間延遲器，用以於該功率開關被關閉(OFF)後，提供一延遲時間。該過電壓偵測裝置(over voltage detection circuit)，於該延遲時間以後，比較該多功能端之電壓與一參考電壓，以觸發一過電壓信號。該過電壓信號表示該輸出電壓超過一預設值。該閘控制器，當該功率開關開啟(ON)時，依據該多功能端之電壓，來觸發關閉該功率開關。當該功率開關開啟(ON)時，該多功能端之電壓表示流經該功率開關之電流。 Embodiments of the present invention provide a controller for controlling a power switch of a power supply. The power supply provides an output voltage. The controller includes a multi-function terminal, a time delay device, an over-voltage detecting device, and a gate controller. The time delay is used to provide a delay time after the power switch is turned off (OFF). The over voltage detection circuit compares the voltage of the multi-function terminal with a reference voltage to trigger an over-voltage signal after the delay time. The overvoltage signal indicates that the output voltage exceeds a predetermined value. The gate controller, when the power switch is turned on (ON), triggers the power switch to be turned off according to the voltage of the multi-function terminal. When the power switch is turned "ON", the voltage of the multi-function terminal represents the current flowing through the power switch.
本發明之實施例提供一種電源供應器。該電源供應器包含有一變壓器，其包含有一主繞組以及一輔助繞組。一功率開關耦接於該主繞組。一偵測電阻耦接於該功率開關與一接地電源線。一控制器具有一 多功能端耦接至該偵測電阻。一二極體與一第一電阻，串接於該輔助繞組與該多功能端之間。 Embodiments of the present invention provide a power supply. The power supply includes a transformer including a main winding and an auxiliary winding. A power switch is coupled to the main winding. A detecting resistor is coupled to the power switch and a ground power line. One controller has one The multi-function terminal is coupled to the detecting resistor. A diode and a first resistor are connected in series between the auxiliary winding and the multi-function end.
本發明之實施例提供一種控制方法，適用於一電源供應器。該電源供應器具有一功率開關，並提供一輸出電壓。於該功率開關導通時，依據一多功能端之電壓，來觸發關閉禁能一閘信號，以關閉該功率開關。該多功能端之電壓代表流經一電感元件之電流。於該功率開關關閉一段延遲時間後，偵測該多功能端之電壓。當該多功能端之電壓高過一預定值，觸發一過電壓信號。 Embodiments of the present invention provide a control method suitable for a power supply. The power supply has a power switch and provides an output voltage. When the power switch is turned on, the disable disable gate signal is triggered according to the voltage of the multi-function terminal to turn off the power switch. The voltage at the multi-function terminal represents the current flowing through an inductive component. After the power switch is turned off for a delay time, the voltage of the multi-function terminal is detected. When the voltage of the multi-function terminal is higher than a predetermined value, an over-voltage signal is triggered.
第4圖係為依據本發明所實施的一SMPS 80。與第1圖之SMPS 10不同的，SMPS 80有基納二極體83、二極體84、電阻86與88、以及控制器82。 Figure 4 is an SMPS 80 implemented in accordance with the present invention. Unlike the SMPS 10 of FIG. 1, the SMPS 80 has a Zener diode 83, a diode 84, resistors 86 and 88, and a controller 82.
控制器82可以是一單晶積體電路，有一多功能端CS/OVP。基納二極體83、二極體84與電阻86串接於輔助繞組23與多功能端CS/OVP之間，而電阻88連接於多功能端CS/OVP與電流偵測電阻16之間。多功能端CS/OVP至少有兩個功能：a)電流偵測；以及，b)過電壓保護。 The controller 82 can be a single crystal integrated circuit having a multi-function terminal CS/OVP. The Zener diode 83, the diode 84 and the resistor 86 are connected in series between the auxiliary winding 23 and the multi-function terminal CS/OVP, and the resistor 88 is connected between the multi-function terminal CS/OVP and the current detecting resistor 16. The multi-function CS/OVP has at least two functions: a) current detection; and, b) overvoltage protection.
當控制器82致能閘信號VGATE，透過GATE端，開啟功率開關15時，多功能端CS/OVP的電壓VCS，會表示流經功率開關15之電流。此時，控制器82依據多功能端CS/OVP的電壓VCS，來決定何時禁能閘信號VGATE，關閉功率開關15。 When the controller 82 enables the gate signal V GATE , through the GATE terminal, when the power switch 15 is turned on, the voltage V CS of the multi-function terminal CS/OVP indicates the current flowing through the power switch 15. At this time, the controller 82 determines when to disable the gate signal V GATE and turns off the power switch 15 according to the voltage V CS of the multi-function terminal CS/OVP.
在功率開關15關閉後，輔助繞組23的電壓VAUX會大約反應二次繞組的電壓，也大致反應了輸出電源VOUT之電壓。如果，電壓VAUX 低於基納二極體83與二極體84所預設的電壓，那多功能端CS/OVP的電壓VCS就會大約是0伏特。如果，電壓VAUX高於那預設的電壓，那多功能端CS/OVP的電壓VCS就會是一大於0伏特的值。為了預防漏感所導致的不準確之問題，控制器82會在功率開關15關閉一段延遲時間後，比較電壓VCS與一參考電壓。如果電壓VCS高於這參考電壓，就會觸發一過電壓信號，表示輸出電源VOUT之電壓已經超過了基納二極體83與二極體84所預設的電壓之一相對應值。 After the power switch 15 is turned off, the voltage V AUX of the auxiliary winding 23 will approximately react to the voltage of the secondary winding and also substantially reflect the voltage of the output power supply V OUT . If the voltage V AUX is lower than the voltage preset by the Zener diode 83 and the diode 84, the voltage V CS of the multi-function terminal CS/OVP will be approximately 0 volts. If the voltage V AUX is higher than the preset voltage, the voltage V CS of the multi-function terminal CS/OVP will be a value greater than 0 volts. In order to prevent the inaccuracy caused by the leakage inductance, the controller 82 compares the voltage V CS with a reference voltage after the power switch 15 is turned off for a delay time. If the voltage V CS is higher than the reference voltage, an overvoltage signal is triggered, indicating that the voltage of the output power source V OUT has exceeded a value corresponding to one of the voltages preset by the Zener diode 83 and the diode 84.
第5圖顯示一部份的控制器82以及控制器82之外的元件。第6圖為第5圖中的信號波形圖。控制器82具有時間延遲器54、過電壓偵測裝置55、以及閘控制器52。過電壓偵測裝置55包含有取樣器56與比較器50。 Figure 5 shows a portion of the controller 82 and components external to the controller 82. Fig. 6 is a signal waveform diagram in Fig. 5. The controller 82 has a time delay 54, an overvoltage detecting means 55, and a gate controller 52. The overvoltage detecting device 55 includes a sampler 56 and a comparator 50.
當信號VG為邏輯上的”1”時，閘信號VGATE也為邏輯上的”1”，功率開關15導通，輔助繞組23的電壓VAUX是負值，其受到二極體84的阻擋，所以不會影響到多功能端CS/OVP的電壓VCS。所以，流經功率開關15之電流增加，電壓VCS也隨之增加，如同第6圖所示。 When the signal V G is a logical "1", the gate signal V GATE is also a logical "1", the power switch 15 is turned on, and the voltage V AUX of the auxiliary winding 23 is a negative value, which is blocked by the diode 84. Therefore, it does not affect the voltage V CS of the multi-function terminal CS/OVP. Therefore, the current flowing through the power switch 15 increases, and the voltage V CS also increases, as shown in Fig. 6.
當電壓VCS到一定程度時，閘控制電路52會使信號VG轉態為邏輯上的”0”，關閉功率開關15。功率開關15一關閉，輔助繞組23的電壓VAUX一開始會震盪一段短時間，之後穩定於一正值，此正值大約比例於輸出電源VOUT的電壓。時間延遲器54，於功率開關15被關閉後，提供一延遲時間TDELAY。延遲時間TDELAY用以避免電壓VAUX震盪所導致不準確問題。延遲時間TDELAY之後，取樣器56發出短脈衝信號VP，對多功能端CS/OVP的電壓VCS取樣，產生取樣信號VSAMP。在短脈衝信號VP為邏輯上的”0”時，取樣信號VSAMP接地，固定為0； 在短脈衝信號VP為邏輯上的”1”時，取樣信號VSAMP等於電壓VCS。如同先前所述的，如果輸出電源VOUT的電壓高，輔助繞組23的電壓VAUX也會高。一旦，輔助繞組23的電壓VAUX高到使基納二極體83崩潰了，會使取樣信號VSAMP高於參考電壓VREF-OVP，則比較器50觸發過電壓信號SOVP。舉例來說，被觸發的電壓信號SOVP可使閘控制器52在幾個連續開關周期都一直維持信號VG於邏輯上的”0”。 When the voltage V CS reaches a certain level, the gate control circuit 52 turns the signal V G to a logical "0", turning off the power switch 15. As soon as the power switch 15 is turned off, the voltage V AUX of the auxiliary winding 23 initially oscillates for a short period of time and then stabilizes at a positive value which is approximately proportional to the voltage of the output power source V OUT . The time delay 54 provides a delay time T DELAY after the power switch 15 is turned off. The delay time T DELAY is used to avoid inaccuracies caused by voltage V AUX oscillation. After the delay time T DELAY , the sampler 56 sends a short pulse signal V P to sample the voltage V CS of the multi-function terminal CS/OVP to generate a sampling signal V SAMP . When the short pulse signal V P is logically "0", the sampling signal V SAMP is grounded and fixed to 0; when the short pulse signal V P is logically "1", the sampling signal V SAMP is equal to the voltage V CS . As previously described, if the voltage of the output power source V OUT is high, the voltage V AUX of the auxiliary winding 23 is also high. Once the voltage V AUX of the auxiliary winding 23 is high enough to cause the Zener diode 83 to collapse, causing the sampling signal V SAMP to be higher than the reference voltage V REF-OVP , the comparator 50 triggers the over voltage signal S OVP . For example, the triggered voltage signal S OVP can cause the gate controller 52 to maintain the signal VG at a logical "0" for several consecutive switching cycles.
第7圖為另一實施例，顯示一部份的控制器82a以及控制器82a之外的元件。第6圖也可以為第7圖中的信號波形圖。在第7圖中，比較器50與遮蔽器58可視為一過電壓偵測裝置。在第7圖中，比較器50比較多功能端CS/OVP之電壓與參考電壓VREF-OVP，以觸發中繼信號SMED。這個中繼信號SMED絕大部分時間內是被遮蔽器58中的及閘所遮蔽，只有當遮蔽器58中的短脈衝信號VP為邏輯上的”1”時，中繼信號SMED的邏輯準位，就會通過，作為過電壓信號SOVP的邏輯準位。第7圖之實施例的其他操作原理可以參考第5圖之說明得知，不再累述。 Figure 7 is another embodiment showing a portion of the controller 82a and components external to the controller 82a. Fig. 6 can also be the signal waveform diagram in Fig. 7. In Fig. 7, the comparator 50 and the shutter 58 can be regarded as an overvoltage detecting means. In FIG. 7, the comparator 50 compares the voltage of the multi-function terminal CS/OVP with the reference voltage V REF-OVP to trigger the relay signal S MED . This relay signal S MED is obscured by the gates in the shutter 58 for most of the time, and only when the short pulse signal V P in the shutter 58 is logically "1", the relay signal S MED The logic level will pass as the logic level of the overvoltage signal S OVP . Other operational principles of the embodiment of FIG. 7 can be referred to the description of FIG. 5 and will not be described again.
第8圖係為依據本發明所實施的另一SMPS 80a。與第4圖之SMPS 80不同的，SMPS 80a沒有基納二極體83。 Figure 8 is another SMPS 80a implemented in accordance with the present invention. Unlike the SMPS 80 of FIG. 4, the SMPS 80a does not have a Zener diode 83.
在第8圖中，於功率開關15關閉後，功能端CS/OVP的電壓VCS大約反應了輔助繞組23的電壓VAUX，也大致反應了輸出電源VOUT之電壓。所以，在功率開關15關閉一段延遲時間後，控制器82比較電壓VCS與一參考電壓。如果電壓VCS高於這參考電壓，就會觸發一過電壓信號，表示輸出電源VOUT之電壓已經超過了這參考電壓所相對應的值。至於第8圖之控制器82的內部結構，可以依據第5圖與第7 圖或是等同的電路來實施。 In Fig. 8, after the power switch 15 is turned off, the voltage V CS of the functional terminal CS/OVP approximately reflects the voltage V AUX of the auxiliary winding 23 and also substantially reflects the voltage of the output power source V OUT . Therefore, after the power switch 15 is turned off for a delay time, the controller 82 compares the voltage V CS with a reference voltage. If the voltage V CS is higher than the reference voltage, an overvoltage signal is triggered, indicating that the voltage of the output power source V OUT has exceeded the corresponding value of the reference voltage. The internal structure of the controller 82 of Fig. 8 can be implemented in accordance with Figs. 5 and 7 or equivalent circuits.
以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.
10‧‧‧開關式電源供應器 10‧‧‧Switching power supply
12‧‧‧橋式整流器 12‧‧‧Bridge rectifier
15‧‧‧功率開關 15‧‧‧Power switch
16‧‧‧電流偵測電阻 16‧‧‧ Current Sense Resistor
18‧‧‧控制器 18‧‧‧ Controller
20‧‧‧變壓器 20‧‧‧Transformers
22‧‧‧二次側繞組 22‧‧‧secondary winding
23‧‧‧輔助繞組 23‧‧‧Auxiliary winding
24‧‧‧一次側繞組 24‧‧‧ primary winding
30‧‧‧負載 30‧‧‧load
32、34‧‧‧比較器 32, 34‧‧‧ comparator
36‧‧‧光耦合器 36‧‧‧Optocoupler
38‧‧‧基納二極體 38‧‧‧Kina II
50‧‧‧比較器 50‧‧‧ comparator
52‧‧‧閘控制器 52‧‧‧ gate controller
54‧‧‧時間延遲器 54‧‧‧Time delay
55‧‧‧過電壓偵測裝置 55‧‧‧Overvoltage detection device
56‧‧‧取樣器 56‧‧‧Sampling device
58‧‧‧遮蔽器 58‧‧‧Shader
80、80a‧‧‧SMPS 80, 80a‧‧ ‧SMPS
82、82a‧‧‧控制器 82, 82a‧‧‧ controller
83‧‧‧基納二極體 83‧‧‧Kina II
84‧‧‧二極體 84‧‧‧ diode
86、88‧‧‧電阻 86, 88‧‧‧ resistance
CS/OVP‧‧‧多功能端 CS/OVP‧‧‧Multifunctional
SMED‧‧‧中繼信號 S MED ‧‧‧Relay signal
SOVP‧‧‧過電壓信號 S OVP ‧‧‧Overvoltage signal
TDELAY‧‧‧延遲時間 T DELAY ‧‧‧Delayed time
VAUX‧‧‧電壓 V AUX ‧‧‧ voltage
VCC‧‧‧操作電源 V CC ‧‧‧Operating power supply
VCS‧‧‧電壓 V CS ‧‧‧ voltage
VG‧‧‧信號 V G ‧‧‧ signal
VGATE‧‧‧閘信號 V GATE ‧‧‧ brake signal
VOUT‧‧‧輸出電源 V OUT ‧‧‧output power supply
VP‧‧‧短脈衝信號 V P ‧‧‧short pulse signal
VREF1‧‧‧參考電壓 V REF1 ‧‧‧reference voltage
VREF-OVP‧‧‧參考電壓 V REF-OVP ‧‧‧reference voltage
VSAMP‧‧‧取樣信號 V SAMP ‧‧‧Sampling signal
第1圖為習知的一SMPS。 Figure 1 is a conventional SMPS.
第2圖與第3圖為普遍知道的過電壓保護方法。 Figures 2 and 3 show the commonly known overvoltage protection method.
第4圖係為依據本發明所實施的一SMPS。 Figure 4 is an SMPS implemented in accordance with the present invention.
第5圖顯示一部份的控制器以及控制器之外的元件。 Figure 5 shows a portion of the controller and components outside of the controller.
第6圖為第5圖中的信號波形圖。 Fig. 6 is a signal waveform diagram in Fig. 5.
第7圖為另一實施例，顯示一部份的控制器以及控制器之外的元件。 Figure 7 is another embodiment showing a portion of the controller and components external to the controller.
第8圖係為依據本發明所實施的另一SMPS。 Figure 8 is another SMPS implemented in accordance with the present invention.
12‧‧‧橋式整流器 12‧‧‧Bridge rectifier
15‧‧‧功率開關 15‧‧‧Power switch
16‧‧‧電流偵測電阻 16‧‧‧ Current Sense Resistor
20‧‧‧變壓器 20‧‧‧Transformers
22‧‧‧二次側繞組 22‧‧‧secondary winding
23‧‧‧輔助繞組 23‧‧‧Auxiliary winding
24‧‧‧一次側繞組 24‧‧‧ primary winding
30‧‧‧負載 30‧‧‧load
80‧‧‧SMPS 80‧‧‧SMPS
82‧‧‧控制器 82‧‧‧ Controller
83‧‧‧基納二極體 83‧‧‧Kina II
84‧‧‧二極體 84‧‧‧ diode
86、88‧‧‧電阻 86, 88‧‧‧ resistance
CS/OVP‧‧‧多功能端 CS/OVP‧‧‧Multifunctional
VAUX‧‧‧電壓 V AUX ‧‧‧ voltage
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW099142411A TWI514708B (en) | 2010-12-06 | 2010-12-06 | Controller for controlling a power supply and control method applied to a power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW099142411A TWI514708B (en) | 2010-12-06 | 2010-12-06 | Controller for controlling a power supply and control method applied to a power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201225463A TW201225463A (en) | 2012-06-16 |
| TWI514708B true TWI514708B (en) | 2015-12-21 |
Family
ID=46726201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW099142411A TWI514708B (en) | 2010-12-06 | 2010-12-06 | Controller for controlling a power supply and control method applied to a power supply |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI514708B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI577117B (en) * | 2016-09-07 | 2017-04-01 | 亞源科技股份有限公司 | Over-voltage protection circuit |
| TWI577116B (en) * | 2016-09-07 | 2017-04-01 | 亞源科技股份有限公司 | Over-voltage protection circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI514729B (en) * | 2014-01-23 | 2015-12-21 | Leadtrend Tech Corp | Control circuit applied to a power converter and operation method thereof |
| TWI629844B (en) * | 2016-10-28 | 2018-07-11 | 偉詮電子股份有限公司 | System for dynamically controlling over voltage protection and voltage converter |
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| TW516261B (en) * | 1998-04-15 | 2003-01-01 | Raychem Corp | Protection systems for rechargeable elements |
| TW200824240A (en) * | 2006-11-24 | 2008-06-01 | Richtek Technology Corp | A waveform valley estimation circuit of a switching component and the method thereof |
| CN100409136C (en) * | 2005-07-21 | 2008-08-06 | 崇贸科技股份有限公司 | Switching control device for primary side control power supply |
| TW200919923A (en) * | 2007-10-29 | 2009-05-01 | System General Corp | Synchronous rectifying circuit for offline power converter |
| TW201009532A (en) * | 2008-08-22 | 2010-03-01 | Leadtrend Tech Corp | Control circuit and power converter using the same and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW516261B (en) * | 1998-04-15 | 2003-01-01 | Raychem Corp | Protection systems for rechargeable elements |
| CN100409136C (en) * | 2005-07-21 | 2008-08-06 | 崇贸科技股份有限公司 | Switching control device for primary side control power supply |
| TW200824240A (en) * | 2006-11-24 | 2008-06-01 | Richtek Technology Corp | A waveform valley estimation circuit of a switching component and the method thereof |
| TW200919923A (en) * | 2007-10-29 | 2009-05-01 | System General Corp | Synchronous rectifying circuit for offline power converter |
| TW201009532A (en) * | 2008-08-22 | 2010-03-01 | Leadtrend Tech Corp | Control circuit and power converter using the same and control method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI577117B (en) * | 2016-09-07 | 2017-04-01 | 亞源科技股份有限公司 | Over-voltage protection circuit |
| TWI577116B (en) * | 2016-09-07 | 2017-04-01 | 亞源科技股份有限公司 | Over-voltage protection circuit |
| US9954457B2 (en) | 2016-09-07 | 2018-04-24 | Asian Power Devices Inc. | Overvoltage protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201225463A (en) | 2012-06-16 |
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