TWI790873B - Secondary side protection detection circuit of power converter - Google Patents
Secondary side protection detection circuit of power converter Download PDFInfo
- Publication number
- TWI790873B TWI790873B TW110148536A TW110148536A TWI790873B TW I790873 B TWI790873 B TW I790873B TW 110148536 A TW110148536 A TW 110148536A TW 110148536 A TW110148536 A TW 110148536A TW I790873 B TWI790873 B TW I790873B
- Authority
- TW
- Taiwan
- Prior art keywords
- resistor
- circuit
- terminal
- power converter
- operational amplifier
- Prior art date
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
一種電源轉換器的二次側保護偵測電路,包含一偵測元件、一加法器放大電路、一電子開關與一充放電路,該偵測元件連接該電源轉換器的一輸出連接端,該加法器放大電路包含一運算放大器、一第一電阻器與一第二電阻器,該運算放大器的輸入端連接該偵測元件,其輸出端連接一次側控制元件,該第一、第二電阻器串聯在該運算放大器的輸入端與電源端之間,該第一、第二電阻器之間具有一連接節點,該電子開關連接在一接地端以及該連接節點之間並包含一控制端,該充放電路連接該電子開關的控制端和該運算放大器的電源端。A secondary side protection detection circuit of a power converter, comprising a detection element, an adder amplifier circuit, an electronic switch and a charge-discharge circuit, the detection element is connected to an output terminal of the power converter, the The adder amplifying circuit includes an operational amplifier, a first resistor and a second resistor, the input end of the operational amplifier is connected to the detection element, and the output end is connected to the primary side control element, the first and second resistors connected in series between the input terminal of the operational amplifier and the power supply terminal, there is a connection node between the first and second resistors, the electronic switch is connected between a ground terminal and the connection node and includes a control terminal, the The charging and discharging circuit is connected with the control terminal of the electronic switch and the power supply terminal of the operational amplifier.
Description
本發明係有關一種二次側保護偵測電路,特別是指電源轉換器的二次側保護偵測電路。 The invention relates to a secondary side protection detection circuit, in particular to a secondary side protection detection circuit of a power converter.
習知電源轉換器的基本架構如圖4所示,其電路架構基本上可包含一變壓器T,該變壓器T的一次側繞組51串聯一驅動開關Q,該驅動開關Q的閘極可連接一PWM控制器53(即:脈波寬度調變控制器)的一信號輸出腳位Y,該PWM控制器53具有一保護模式觸發腳位X。該變壓器T的一次側繞組51還連接該電源轉換器50的電源輸入端以接收一直流輸入電源VDC,且該變壓器T的二次側繞組52的兩端可透過二次側電路54而連接該電源轉換器50的一正電源輸出端(+Vo)與一負電源輸出端(-Vo),該正電源輸出端(+Vo)與該負電源輸出端(-Vo)供連接一負載60。其中,該負電源輸出端(-Vo)串聯一偵測電阻55,該偵測電路55連接一放大電路56,該放大電路56可為由運算放大器(OPA)構成的反相放大電路或非反相放大電路,該放大電路56透過一回授隔離電路57連接該PWM控制器53的保護模式觸發腳位X,該回授隔離電路57可為由光耦合器構成的電路。
The basic structure of a conventional power converter is shown in FIG. 4 . The circuit structure basically includes a transformer T. The primary side winding 51 of the transformer T is connected in series with a drive switch Q. The gate of the drive switch Q can be connected to a PWM A signal output pin Y of the controller 53 (ie, a pulse width modulation controller), the
該電源轉換器50的工作原理在於,該PWM控制器53輸出驅動信號至該驅動開關Q,該驅動開關Q根據該驅動信號而作動,而使該直流輸入電源VDC通過該變壓器T與該二次側電路54的轉換後,於該正電源輸出端(+Vo)與該負電源輸出端(-Vo)產生一直流輸出電源,因此通過該偵測電阻55的電流而在該偵測電阻55產生的電壓(後稱偵測電壓)可反映該電源轉換器50供應給該負載60的電流,該放大電路56將該偵測電壓進行放大後,透過該回授隔離電路57提
供給該PWM控制器53的保護模式觸發腳位X。當該保護模式觸發腳位X接收到的電壓大於或等於一保護模式門檻值,通常代表該負載60發生異常狀況,該PWM控制器53即進入一保護模式,在該保護模式下,該PWM控制器53停止輸出驅動信號至該驅動開關Q,讓該電源轉換器50停止作動,從而停止輸出該直流輸入電源給該負載60,藉此達到保護的作用。
The working principle of the
當該電源轉換器50所連接的負載是電容性負載,也就是說該負載60的輸入端設有一輸入電容器Cin,在該電源轉換器50的啟動瞬間,將產生對該負載60的輸入電容器Cin進行充電的一湧浪電流,該湧浪電流反映在該放大電路56的輸出電壓波形可參考圖5,該湧浪電流發生在t0至t1,該電源轉換器50於t1後進入穩態。
When the load connected to the
然而,在t0至t1期間,該放大電路56的輸出電壓將達到一電壓值Vth,該電壓值Vth通過該回授隔離電路57回饋到該PWM控制器53的保護模式觸發腳位X後,會導致該PWM控制器53進入該保護模式。也就是說,該電源轉換器50一啟動就直接進入保護模式,從而無法提供該直流輸出電源給該負載60。
However, during the period from t0 to t1, the output voltage of the amplifying
有鑒於此,本發明的主要目的是提供一種電源轉換器的二次側保護偵測電路,以期克服習知電源轉換器一啟動就直接進入保護模式,從而無法提供電源給負載的缺點。 In view of this, the main purpose of the present invention is to provide a secondary-side protection detection circuit of a power converter, so as to overcome the conventional disadvantage that the power converter directly enters the protection mode upon startup, thereby failing to provide power to the load.
本發明電源轉換器的二次側保護偵測電路包含:一偵測元件,連接該電源轉換器的一輸出連接端;一加法器放大電路,包含一運算放大器、一第一電阻器與一第二電阻器,該運算放大器包含:一輸入端,連接該偵測元件;一輸出端,連接該電源轉換器的一次側控制元件;及 一電源端;該第一電阻器與該第二電阻器串聯在該運算放大器的輸入端與電源端之間,該第一電阻器與該第二電阻器之間具有一連接節點;一電子開關,連接在一接地端以及該連接節點之間並包含一控制端;以及一充放電路,連接該電子開關的控制端和該運算放大器的電源端。 The secondary side protection detection circuit of the power converter of the present invention includes: a detection element connected to an output terminal of the power converter; an adder amplifier circuit including an operational amplifier, a first resistor and a first resistor Two resistors, the operational amplifier includes: an input end connected to the detection element; an output end connected to the primary side control element of the power converter; and A power supply terminal; the first resistor and the second resistor are connected in series between the input terminal of the operational amplifier and the power supply terminal, and there is a connection node between the first resistor and the second resistor; an electronic switch , which is connected between a ground terminal and the connection node and includes a control terminal; and a charge-discharge circuit, which connects the control terminal of the electronic switch and the power supply terminal of the operational amplifier.
根據本發明的二次側保護偵測電路的電路架構,在該電源轉換器啟動瞬間雖有湧浪電流,本發明透過該加法器放大電路的電路結構,該運算放大器從該偵測元件得到的電壓極性與其電源端的電壓極性彼此相反,能整體降低該運算放大器於其輸出端的輸出電壓,以致於該一次側控制元件的保護模式觸發腳位的電壓小於保護模式門檻值,故湧浪電流不會導致該一次側控制元件進入保護模式,藉此克服先前技術所述問題。另一方面,穩態時,該充放電路的儲能足以導通該電子開關,可將使該第一電阻器與該第二電阻器之間的連接節點處於低電位或接地,使該加法器放大電路成為一般的放大電路,即能對通過該偵測元件的穩態電流進行常規保護監控。 According to the circuit structure of the secondary side protection detection circuit of the present invention, although there is a surge current at the moment the power converter is started, the present invention uses the circuit structure of the adder amplifier circuit, and the operational amplifier obtains from the detection element The voltage polarity and the voltage polarity of the power supply terminal are opposite to each other, which can reduce the output voltage of the operational amplifier at its output terminal as a whole, so that the voltage of the protection mode trigger pin of the primary side control element is lower than the protection mode threshold value, so the surge current will not This causes the primary side control element to enter a protection mode, thereby overcoming the problems described in the prior art. On the other hand, in a steady state, the energy storage of the charging and discharging circuit is enough to turn on the electronic switch, which can make the connection node between the first resistor and the second resistor be at a low potential or ground, so that the adder The amplifying circuit becomes a general amplifying circuit, that is, it can carry out conventional protection monitoring on the steady-state current passing through the detecting element.
另一方面,本發明僅利用運算放大器、電阻器、電容器、電子開關等簡單元件即可完成,不需使用包含微控制器的數位控制電路,使成本大幅降低。 On the other hand, the present invention can be completed by using only simple components such as operational amplifiers, resistors, capacitors, electronic switches, etc., and does not need to use digital control circuits including microcontrollers, so that the cost is greatly reduced.
10,50:電源轉換器 10,50: power converter
11,51:一次側繞組 11,51: primary side winding
12,52:二次側繞組 12,52: Secondary side winding
13,53:PWM控制器 13,53: PWM controller
14,54:二次側電路 14,54: Secondary side circuit
20,60:負載 20,60: load
55:偵測電阻 55: Detection resistor
30:二次側保護偵測電路 30:Secondary side protection detection circuit
31:偵測元件 31: Detection component
32:加法器放大電路 32: Adder amplifier circuit
320:運算放大器 320: operational amplifier
321:電源端 321: power terminal
322:輸出端 322: output terminal
33:充放電路 33: Charge and discharge circuit
34:輔助放電電路 34: Auxiliary discharge circuit
350:控制端 350: control terminal
40,57:回授隔離電路 40,57: feedback isolation circuit
56:放大電路 56: Amplifying circuit
Q1:電子開關 Q1: Electronic switch
Y:信號輸出腳位 Y: Signal output pin
X:保護模式觸發腳位 X: protection mode trigger pin
T:變壓器 T: Transformer
Q:驅動開關 Q: Drive switch
VDC:直流輸入電源 VDC: DC input power
(+Vo):正電源輸出端 (+Vo): Positive power output
(-Vo):負電源輸出端 (-Vo): Negative power supply output
R4:第一電阻器 R4: first resistor
R5:第二電阻器 R5: second resistor
N1,N2:連接節點 N1, N2: connection nodes
R1,R2,R3,R6,R7:電阻器 R1, R2, R3, R6, R7: Resistors
C1:電容器 C1: Capacitor
VCC1:工作電壓 VCC1: working voltage
D2:二極體 D2: Diode
Cin:輸入電容器 Cin: input capacitor
V sense :偵測電壓 V sense : detection voltage
圖1:本發明二次側保護偵測電路的實施例連接電源轉換器的電路示意圖。 FIG. 1 : A schematic circuit diagram of an embodiment of a secondary side protection detection circuit of the present invention connected to a power converter.
圖2:本發明二次側保護偵測電路的實施例的電路示意圖。 FIG. 2 is a schematic circuit diagram of an embodiment of the secondary side protection detection circuit of the present invention.
圖3:本發明二次側保護偵測電路的實施例回饋至一次側控制元件的電壓波形示意圖。 FIG. 3 is a schematic diagram of a voltage waveform fed back to a primary side control element by an embodiment of the secondary side protection detection circuit of the present invention.
圖4:習知電壓範圍電源轉換器與放大電路的連接電路示意圖。 Figure 4: A schematic diagram of a connection circuit between a conventional voltage range power converter and an amplifying circuit.
圖5:習知放大電路回饋至一次側控制元件的電壓波形示意圖。 Figure 5: Schematic diagram of the voltage waveform fed back to the primary-side control element by a conventional amplifier circuit.
本發明二次側保護偵測電路係用於電源轉換器,需說明的是,該電源轉換器的電路架構與工作原理並非本發明的重點,僅簡述如下。 The secondary side protection detection circuit of the present invention is used in a power converter. It should be noted that the circuit structure and working principle of the power converter are not the focus of the present invention, and are only briefly described as follows.
請參考圖1,該電源轉換器10可為寬輸入電壓範圍的切換式電源轉換器,或可為步階升壓電源轉換器,故本發明能應用層面廣泛。舉例而言,該電源轉換器10電路架構基本上可包含一變壓器T、一驅動開關Q、一PWM控制器13(即:脈波寬度調變控制器)與一二次側電路14,該PWM控制器13包含一信號輸出腳位Y與一保護模式觸發腳位X。該變壓器T的一次側繞組11串聯一驅動開關Q,該驅動開關Q例如可為金氧半場效電晶體(MOSFET),其閘極可連接該PWM控制器13的信號輸出腳位Y。該變壓器T的一次側繞組11還連接該電源轉換器10的電源輸入端以接收一直流輸入電源VDC,且該變壓器T的二次側繞組12的兩端可透過該二次側電路14而連接該電源轉換器10的複數輸出連接端,該複數輸出連接端可包含一正電源輸出端(+Vo)與一負電源輸出端(-Vo),該正電源輸出端(+Vo)與該負電源輸出端(-Vo)供連接一負載20。該電源轉換器10的工作原理可參考先前技術,在此容不重複贅述,簡言之,當該PWM控制器13的保護模式觸發腳位X接收到的電壓大於或等於一保護模式門檻值,該PWM控制器13即進入一保護模式,在該保護模式下,該PWM控制器13停止輸出驅動信號至該驅動開關Q,讓該電源轉換器10停止作動,從而停止輸出該直流輸入電源給該負載20,藉此達到保護的作用。
Please refer to FIG. 1 , the
請參考圖1與圖2,本發明二次側保護偵測電路30包含一偵測元件31、一加法器放大電路32、一電子開關Q1與一充放電路33,或更包含一輔助放電電路34。該二次側保護偵測電路30可透過一回授隔離電路(feedback
isolation)40連接該PWM控制器13的保護模式觸發腳位X,以在適當時機觸發該PWM控制器13進入保護模式,詳述如後。
Please refer to FIG. 1 and FIG. 2, the secondary side
該偵測元件31連接該電源轉換器10的其中之一輸出連接端,本發明的實施例中,該偵測元件31串聯於該負電源輸出端(-Vo)與該變壓器T的二次側繞組12之間,該偵測元件31可為電阻器,其電阻值越小越好,以將其耗電量最小化。
The
該加法器放大電路32包含一運算放大器(operational amplifier,OPA)320與電連接該運算放大器320的複數電阻器,該運算放大器320包含一輸入端、一電源端321與一輸出端322,該運算放大器320的輸入端供連接該偵測元件31,該運算放大器320的輸出端322連接該電源轉換器10的一次側控制元件,本發明的實施例中,所述一次側控制元件即為該PWM控制器13,該運算放大器320的輸出端322透過該回授隔離電路(feedback isolation)連接該PWM控制器13的保護模式觸發腳位X,該回授隔離電路40例如可包含光耦合器。
The
一般而言,該運算放大器320與該複數電阻器透過不同的連接結構,可實現反相加法器電路結構或非反相加法器電路結構,本發明的加法器放大電路32係以反相加法器電路結構為例,該運算放大器320包含一反相輸入端(-)與一非反相輸入端(+),前述中,該運算放大器320連接該偵測元件31的該輸入端為該反相輸入端(-),使該運算放大器320能接收該偵測元件31的偵測電壓(即:壓升)V sense ,該偵測元件31的偵測電壓V sense 即反映該電源轉換器10的輸出電流。
Generally speaking, the
如圖2所示,該加法器放大電路32所包含的該複數電阻器包含一第一電阻器R4與一第二電阻器R5,該第一電阻器R4與該第二電阻器R5串聯在該運算放大器320的反相輸入端(-)與電源端321之間,也就是說,該第一電阻器R4的一端連接該運算放大器320的電源端321,該第一電阻器R4的另一端連接該
第二電阻器R5的一端,該第二電阻器R5的另一端連接該運算放大器320的反相輸入端(-),該第一電阻器R4與該第二電阻器R5之間具有一連接節點N1。如圖2所示反相加法器電路結構的實施例,該運算放大器320的非反相輸入端(+)透過一電阻器R3而接地,該運算放大器320的輸出端322與反相輸入端(-)之間連接一電阻器R1,該運算放大器320的反相輸入端(-)通過一電阻器R2連接該偵測元件31,該運算放大器320的電源端321接收一工作電壓VCC1,舉例來說,該運算放大器320的電源端321可連接一二次側輔助繞組(圖中未示),以從該二次側輔助繞組獲得該工作電壓VCC1。
As shown in FIG. 2, the complex resistors included in the
該電子開關Q1連接一接地端以及透過該加法器放大電路32之該複數電阻器當中的一電阻器連接該運算放大器320的電源端321,例如該電子開關Q1可透過該第一電阻器R4而連接該運算放大器320的電源端321,當該電子開關Q1操作在導通狀態時,可將該連接節點N1處於低電位或接地;相對的,當該電子開關Q1操作在截止狀態時,該第一電阻器R4與該第二電阻器R5為串聯狀態,該運算放大器320的電源端321處於高電位。該電子開關Q1包含一控制端350,該電子開關Q1可根據該控制端350的電壓大小而操作在導通狀態或截止狀態。其中,該電子開關Q1可為一電晶體,例如為N型金氧半場效電晶體(N-type MOSFET),其汲極連接該第一電阻器R4與該第二電阻器R5之間的連接節點N1,其源極連接該接地端,其閘極為該控制端350。
The electronic switch Q1 is connected to a ground terminal and a resistor among the plurality of resistors through the
該充放電路33連接該電子開關Q1的控制端350和該運算放大器320的電源端321,顧名思義,該充放電路33具有一儲能元件,該充放電路33的功能在於當該運算放大器320的電源端321接收該工作電壓VCC1,該工作電壓VCC1同時對該充放電路33的儲能元件進行充電,使該儲能元件提供給該電子開關Q1之控制端350的電壓逐漸提高,並可提高到足以讓該電子開關Q1操作在導通狀態。本發明的實施例中,該充放電路33包含一電阻器R6與一電容器C1,
該充放電路33的電阻器R6連接該電子開關Q1的控制端350與該運算放大器320的電源端321之間,該電容器C1即為如前所述的該儲能元件,該電容器C1連接該電子開關Q1的控制端350與該接地端之間,是以,該電阻器R6與該電容器C1能構成一充放電路徑,該工作電壓VCC1能透過該電阻器R6對該電容器C1充電,其中,該電阻器R6與電容器C1之間具有一連接節點N2。
The charging and discharging
本發明二次側保護偵測電路30應用在電源轉換器10的整體電路架構已如上所述,以下配合電流波形說明本發明實施的二次側保護偵測的電路動作。
The overall circuit structure of the secondary-side
請參考圖1,當該電源轉換器10所連接的負載20是電容性負載,也就是說該負載20的輸入端設有一輸入電容器Cin,在該電源轉換器10的啟動瞬間,將產生對該負載20的輸入電容器Cin進行充電的一湧浪電流,此時該電子開關Q1尚未導通,該加法器放大電路32發揮其加法功能,雖然該湧浪電流通過該偵測元件31時產生一較大的偵測電壓V sense ,但該偵測電壓V sense 與該工作電壓VCC1的電壓極性相反,故本發明透過該第一電容器R4與該第二電容器R5的設置,能降低該運算放大器320於其輸出端321的輸出電壓V op ,表示如下:
上式中,該偵測電壓V sense 為負電壓,該工作電壓VCC1為正電壓,也就是說,縱使該湧浪電流通過該偵測元件31時產生較大的該偵測電壓V sense ,但其通過該運算放大器320的處理後,降低的幅度可表示如下式:
藉此,該運算放大器320輸出的電壓仍讓該保護模式觸發腳位X接收到的電壓低於該保護模式門檻值,讓該電源轉換器10的啟動瞬間不會觸發該PWM控制器13進入保護模式。
In this way, the voltage output by the
當該電源轉換器10在穩態時,通過該偵測元件31的穩態電流小於該湧浪電流,此時,該充放電路33之電容器C1被該工作電壓VCC1充電到足以讓該電子開關Q1操作在導通狀態。當該電子開關Q1操作在導通狀態,該加法器放大電路32的第一電阻器R4和第二電阻器R5之間的連接節點N1接地,該加法器放大電路32未發揮其加法功能(即:相當於一般的反向放大器),該運算放大器320僅得放大該穩態電流通過該偵測元件31時產生的該偵測電壓V sense 。如此一來,縱使該負載20發生短路故障,將有一短路電流通過該偵測元件31,該短路電流通過該偵測元件31時產生的該偵測電壓V sense 被該運算放大器320直接放大,並未降低如前所述的電壓幅度,該運算放大器320輸出的電壓致使該保護模式觸發腳位X接收到的電壓大於或等於該保護模式門檻值,進而觸發該PWM控制器13進入保護模式,以提供短路保護功能。
When the
歸納以上所述,該運算放大器320之輸出端322的電壓波形可參考圖3,該電源轉換器10在t0啟動,雖然其啟動瞬間(t0至t1期間)產生該湧浪電流,但藉由該加法器放大電路32發揮其加法功能,和圖5相比,圖3顯示該運算放大器320於其輸出端321的電壓係整體降低。隨著時間進行,該充放電路33之電容器C1在t2被充電到足以讓該電子開關Q1操作在導通狀態,故在t2之後,通過該偵測元件31的電流已是穩態電流,其中,透過該充放電路33的電容器C1的電容值與電阻器R6的電阻值的搭配,可決定導通該電子開關Q1時機,亦即可決定t0至t2的時間長度。再者,圖3的波形顯示t3開始發生一短路電流,在t4讓該運算放大器320之輸出端322達到一電壓值Vth,該電壓值Vth透過該回授隔離電
路40回饋到該PWM控制器13的保護模式觸發腳位X時,能觸發該PWM控制器13進入保護模式,以提供短路保護功能。
To sum up the above, the voltage waveform of the
另考量運作中的該電源轉換器10可能被斷電後並立刻啟動(例如該直流輸入電源VDC發生瞬間不穩定的狀態),本發明設置該輔助放電電路34,該輔助放電電路34包含一二極體D2與一電阻器R7,該二極體D2的陽極連接該充放電路33之電阻器R6與電容器C1的連接節點N2,該二極體D2的陰極連接該運算放大器320的電源端321,也就是說,該二極體D2可跨接於該充放電路33的電阻器R6,該輔助放電電路34的電阻器R7連接該電子開關Q1的控制端350與該接地端之間。
In addition, considering that the
當該電源轉換器10被斷電後,該充放電路33的電容器C1和該電子開關Q1的寄生電容可經由該二極體D2提供的放電路徑與該電阻器R7提供的另一放電路徑進行放電,利用多放電路徑達成加速放電的效果,進而加速讓該電子開關Q1截止,並最小化該電容器C1的儲能。藉此,當該電源轉換器10被斷電後並立刻啟動時,可確保該電子開關Q1是截止狀態,使該加法器放大電路32能順利重置為發揮加法功能的初始狀態;另一方面,因為該電容器C1的儲能已最小化,對應地最大化該電容器C1充電到能導通該電子開關Q1的時間,也就是說,有更充裕的時間能抑制該湧浪電流所造成的影響。
When the
30:二次側保護偵測電路 30:Secondary side protection detection circuit
32:加法器放大電路 32: Adder amplifier circuit
320:運算放大器 320: operational amplifier
321:電源端 321: power terminal
322:輸出端 322: output terminal
33:充放電路 33: Charge and discharge circuit
34:輔助放電電路 34: Auxiliary discharge circuit
350:控制端 350: control terminal
Q1:電子開關 Q1: Electronic switch
R4:第一電阻器 R4: first resistor
R5:第二電阻器 R5: second resistor
N1,N2:連接節點 N1, N2: connection nodes
R1,R2,R3,R6,R7:電阻器 R1, R2, R3, R6, R7: Resistors
C1:電容器 C1: Capacitor
VCC1:工作電壓 VCC1: working voltage
D2:二極體 D2: Diode
V sense :偵測電壓 V sense : detection voltage
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW110148536A TWI790873B (en) | 2021-12-23 | 2021-12-23 | Secondary side protection detection circuit of power converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW110148536A TWI790873B (en) | 2021-12-23 | 2021-12-23 | Secondary side protection detection circuit of power converter |
Publications (2)
Publication Number | Publication Date |
---|---|
TWI790873B true TWI790873B (en) | 2023-01-21 |
TW202327211A TW202327211A (en) | 2023-07-01 |
Family
ID=86670311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW110148536A TWI790873B (en) | 2021-12-23 | 2021-12-23 | Secondary side protection detection circuit of power converter |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI790873B (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5285367A (en) * | 1992-02-07 | 1994-02-08 | Power Integrations, Inc. | Linear load circuit to control switching power supplies under minimum load conditions |
JP2000023457A (en) * | 1998-07-02 | 2000-01-21 | Tdk Corp | Switching power device |
TW483224B (en) * | 1999-05-11 | 2002-04-11 | Sony Corp | Switching power supply circuit |
JP2006333569A (en) * | 2005-05-24 | 2006-12-07 | Fuji Electric Systems Co Ltd | Magnetic deflection detector of dc-dc converter |
JP2010130866A (en) * | 2008-12-01 | 2010-06-10 | Chuo Seisakusho Ltd | Direct current power supply apparatus |
US8814327B2 (en) * | 2011-07-01 | 2014-08-26 | Canon Kabushiki Kaisha | Power supply apparatus and printing apparatus |
CN206099799U (en) * | 2016-09-08 | 2017-04-12 | 西南交通大学 | Two -way AC DC single -phase converter of DC |
TWM627325U (en) * | 2021-12-23 | 2022-05-21 | 捷拓科技股份有限公司 | Secondary side protection and detection circuit for power converter |
-
2021
- 2021-12-23 TW TW110148536A patent/TWI790873B/en active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5285367A (en) * | 1992-02-07 | 1994-02-08 | Power Integrations, Inc. | Linear load circuit to control switching power supplies under minimum load conditions |
JP2000023457A (en) * | 1998-07-02 | 2000-01-21 | Tdk Corp | Switching power device |
TW483224B (en) * | 1999-05-11 | 2002-04-11 | Sony Corp | Switching power supply circuit |
JP2006333569A (en) * | 2005-05-24 | 2006-12-07 | Fuji Electric Systems Co Ltd | Magnetic deflection detector of dc-dc converter |
JP2010130866A (en) * | 2008-12-01 | 2010-06-10 | Chuo Seisakusho Ltd | Direct current power supply apparatus |
US8814327B2 (en) * | 2011-07-01 | 2014-08-26 | Canon Kabushiki Kaisha | Power supply apparatus and printing apparatus |
CN206099799U (en) * | 2016-09-08 | 2017-04-12 | 西南交通大学 | Two -way AC DC single -phase converter of DC |
TWM627325U (en) * | 2021-12-23 | 2022-05-21 | 捷拓科技股份有限公司 | Secondary side protection and detection circuit for power converter |
Also Published As
Publication number | Publication date |
---|---|
TW202327211A (en) | 2023-07-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7787264B2 (en) | Apparatus to provide synchronous rectifying circuit for flyback power converters | |
JP4825632B2 (en) | DC-DC converter | |
US20100308655A1 (en) | Step-up switching power supply device | |
JP2003224968A (en) | Switching power circuit | |
US20100046124A1 (en) | Boost DC-DC converter control circuit and boost DC-DC converter having protection circuit interrupting overcurrent | |
US20110063877A1 (en) | Synchronous rectifying circuit with primary-side swithching current detection for offline power converters | |
CN114389449B (en) | Bootstrap switch converter and driving circuit thereof | |
US6807071B1 (en) | Transformer isolated driver | |
CN112104203B (en) | Switch current-limiting circuit and power chip | |
CN109412397B (en) | Secondary ramp compensation circuit of pulse width modulation current mode switching power supply | |
KR20010111459A (en) | Power supply, electronic device using the same and output short-circuit protection method for the same | |
TWM627325U (en) | Secondary side protection and detection circuit for power converter | |
TWI790873B (en) | Secondary side protection detection circuit of power converter | |
JP6116002B2 (en) | DC-DC power supply circuit | |
WO2017199716A1 (en) | Switch circuit with active snubber circuit, and dc-dc converter | |
CN110504829B (en) | DC-DC conversion circuit and control method thereof | |
CN216794848U (en) | Secondary side protection detection circuit of power converter | |
TW202017295A (en) | Power converter | |
CN116365849A (en) | Secondary side protection detection circuit of power converter | |
EP4246789A1 (en) | Secondary-side protection and sense circuit for power converter | |
CN108111003B (en) | Thyristor driving circuit and method | |
TWI663824B (en) | Power conversion device | |
US11955881B2 (en) | Secondary-side protection and sense circuit for power converter | |
CN112968425A (en) | Secondary short-circuit protection circuit of switching power supply | |
JP3469455B2 (en) | Switching power supply |