CN101017973B - Peak over-current protection of switch voltage stabilization power adjusting pipe - Google Patents
Peak over-current protection of switch voltage stabilization power adjusting pipe Download PDFInfo
- Publication number
- CN101017973B CN101017973B CN2006101679621A CN200610167962A CN101017973B CN 101017973 B CN101017973 B CN 101017973B CN 2006101679621 A CN2006101679621 A CN 2006101679621A CN 200610167962 A CN200610167962 A CN 200610167962A CN 101017973 B CN101017973 B CN 101017973B
- Authority
- CN
- China
- Prior art keywords
- resistance
- power supply
- diode
- voltage
- current protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The disclosed switch stabilized voltage adjustment tube V for peak over-current protection comprises: on the main loop of tube V, serial connecting a peak over-current sampling resistor R3; connecting a diode (or stabilized tube) V35 branch with the terminal-control tube VN or VP base; on the secondary of switch transformer or work-frequency transformer T, filtering by diode U61 and polar rectification capacitor C61, and connecting the over-load turn-off device with voltage- sensitive switch device D9. This invention has well performance with low cost.
Description
Technical field
The present invention relates to electronic technology field, particularly TV technology.
Background technology
Prior art switching power supply (claiming Switching Power Supply again), by annexation differences such as input end capacitor, main load end electric capacity, Switching Power Supply adjustment pipe, main fly-wheel diode, switch transformers: can be divided into tandem tap power supply and pressure swing type (that is: elevation type, parallel connection) these two kinds of body feature of Switching Power Supply.Divide by mode of oscillation, commonly used is full independent-excited Switching Power Supply of quasi-resonance and self-activated switch power supply now.The pure independent-excited Switching Power Supply of quasi-resonance all is integrated.Interior circuit is very complicated but peripheral cell is less, this oscillator does not need transformer coupled generation, only need reversed polarity rectification quasi-resonance delayed sync signal, so, have and adapt to input power network fluctuation scope when very wide, still can keep excellent on off state, can not resemble self-activated switch power supply, easy blasting phenomenon when the under-voltage fluctuation of input electrical network easily causes underexcitation and the overvoltage of input electrical network.Intermittently PRC mode of oscillation is adopted in the standby of quasi-resonance independent-excited Switching Power Supply, and oneself power consumption is very little, now all less than 1W, so the utilization of quasi-resonance independent-excited Switching Power Supply is more and more wider.But, self-activated switch power supply, the double again oscillating tube of switching tube, realize self-oscillation by transformer positive feedback winding coupled positive feedback network, though succinct reliable and low-cost advantage, but, positive feedback winding self-excitation voltage and input electrical network relation in direct ratio, easy blasting phenomenon when easily causing underexcitation and electrical network overvoltage when bringing the under-voltage fluctuation of input electrical network.So scope was less than the full independent-excited Switching Power Supply of quasi-resonance when self-activated switch power supply adapted to the input power network fluctuation, from property/price ratio and reliability consideration: 1, have only and increase the present invention's AC network rectifying and wave-filtering mode device that automaticallyes switch, (could realize input power network fluctuation superwide voltage stable power supplier (applying for a patent in addition).2, increase a soft starting circuit of the present invention and a control oscillation technology, can realize standby low-power consumption (applying for a patent in addition).3, increase Switching Power Supply adjustment pipe peak over-current protection circuit of the present invention and the present invention overload or other unusual shutdown units etc., can make the self-activated switch power supply P/C ratio of original deficiency, surpass integrated quasi-resonance independent-excited Switching Power Supply advantage.Prior art Switching Power Supply self overload protecting circuit is complicated, realize the most simple and effective Switching Power Supply tube overload protection?
Summary of the invention
The object of the present invention is to provide a kind of switch voltage-stabilizing pipe power adjustment pipe peak over-current protection device, the overcurrent protection by the switching tube peak inrush current realization switching tube of flowing through realizes the most simple and effective Switching Power Supply tube overload protection.
For achieving the above object; technical scheme of the present invention is: a kind of peak over-current protection of switch voltage stabilization power adjusting pipe device; include input end capacitor, main output capacitor, Switching Power Supply adjustment pipe, main fly-wheel diode, switching mode power supply transformer, surely control loop; it is characterized in that; serial connection peak value overcurrent sample circuit on Switching Power Supply adjustment pipe major loop; Switching Power Supply adjustment pipe main line also by diode or voltage-stabiliser tube branch road be connected in whole keyholed back plate or base stage, thereby realize peak over-current protection.
Compared to prior art, the present invention directly realizes the switching tube overcurrent protection by the switching tube peak inrush current of flowing through, and has quick reliable advantage.
Description of drawings
Figure of description has 1 page of 5 width of cloth.Accompanying drawing derives from the pairing schematic diagram of the true concrete printed circuit board (pcb) of realization colour TV machine product.Figure of description, the specific embodiment of the indispensable essential characteristics that detailed especially the present invention is correlated with.(particularly element and the item thereof) that specification and accompanying drawing are not explained explained by the legal or current example of passing through.[circuit element, parameter and item thereof are only represented the relevant attribute BOM with element of accompanying drawing item parameter among this machine product schematic diagram mapping nature printing circuit board PCB, and not all at this specification and mark, only supply preferred embodiment of the present invention specific product with reference to].(circuit) the plate common port of the cold end that does not involve mutually with electrical network " " ⊥ GND or ⊥ add other marks and be equal to and simplify the ⊥ mark.In the different accompanying drawings, contain same tag, have same target, refer to that function or performance effect are identical.Vcc can refer to arbitrary power supply hot end, sometimes in order to distinguish different Vcc, as: usefulness+B, Z, C+, the power supply mark that 5V-1 etc. are different can be the different electrical power voltage value, except that Vcc, same reference numerals person can be connected in the same accompanying drawing.Fig. 1 or Fig. 2 are different embodiment.Switching tube V shown in the drawings is the field effect transistor switch device, can adopt transistor.Referring to Fig. 3 example.Fig. 4 or electrical network overvoltage of Fig. 5 example or under-voltage shutdown circuit.
Embodiment
Describe realization best way of the present invention in detail below in conjunction with the accompanying drawing example.Preamble has been stated or has no longer been repeated in conjunction with continue to use prior art or in like manner should change etc.
[Fig. 1 example]: surely control loop by direct sample of the present invention and hold concurrently soft starting circuit 4 by behind the photoelectrical coupler N, again by whole keyholed back plate VN, the on/off of modulating switch power source pipe V.
Get and come from the direct rectified wave electric capacity of electrical network Z, through resistance R 1 as starting resistance, by setovering as photoelectrical coupler N output after switching mode power supply transformer secondary diode U34B rectification, the capacitor C 34B filtering, apply to pressure swing type Switching Power Supply (that is: elevation type Switching Power Supply, the paralleling switch power supply) occasion, voltage-stabiliser tube W6 and diode D322 can remove short circuit.From main output end power C positive pole, through resistance R N and resistance (or: voltage-stabiliser tube) after the RN3 dividing potential drop as photoelectrical coupler N input power supply.Resistance or voltage-stabiliser tube RN3 can be through ground connection just after the capacitor C 612, and capacitor C 612 can be used as the power supply of anti-start impulse current and the relevant circuit of demagnetization relay K B.Capacitor C 32 is soft start capacitors, can prolong each output end voltage climbing time of start.Executive circuit is switched in diode D323 and the work of being connected in of voltage-stabiliser tube W323 branch road/standby.
[Fig. 2 example]: with Fig. 1 difference, surely control loop by direct sample of the present invention and hold concurrently soft starting circuit 4 by behind the photoelectrical coupler N, again by whole keyholed back plate VP, the on/off of modulating switch power source pipe V.Get and come from the direct rectified wave electric capacity of electrical network Z, through resistance R 1 directly as starting resistance, dual-purpose positive feedback winding N2, by form after the rectification of switching mode power supply transformer secondary diode U33 antipole, capacitor C 33 filtering to " " negative pressure source surely controls the loop service power supply as photoelectrical coupler N output, particularly as whole keyholed back plate VP bias source.
The present invention can improve prior art and be described as follows referring to [Fig. 3 example]: the modal self-activated switch power supply of prior art discrete component, derive from SANYO GS 80P movement and the 83PG of Sanyo movement, the 83PG of Sanyo movement power supply is all identical with the A2/A3/A8 of Sanyo.Be called for short the A3 of Sanyo power supply.This is diode of timing capacitor CB multi-parallel in the power supply positive feedback network, should remove to good, and this is that power supply positive feedback network improves the back with reference to this [Fig. 2 example] middle regularly capacitance resistance ware RB, CB branch road.Otherwise whole keyholed back plate VN multiplication factor is required very high, electrical network is under-voltage easier underexcitation, the A3 of Sanyo power supply, derailing switch V emitter are not set up overcurrent protection and are detected resistance.Increase resistance and diode V35 branch road again so should set up peak over-current protection detection resistance R 3, connecting eventually, control device VN has just realized peak over-current protection.In order to realize electrical network overvoltage or under-voltage shutdown (standby) function, can increase the relevant overload of the present invention shutdown circuit with reference to [Fig. 4 or Fig. 5 example]. just can realize input electrical network overvoltage or under-voltage shutdown function.
[Fig. 5 example]: T level of switch transformer or Industrial Frequency Transformer, after diode U61 same polarity commutation capacitor C61 filtering, pass through voltage-stabiliser tube D61 and resistance R 118, R119 more over the ground after the dividing potential drop, one the tunnel pass through pressure sensitive switch device D9 branch road again after, connect J7/J7B end points in the overload shutdown unit of the present invention, realize electrical network overvoltage shutdown function.After another road is passed through pressure sensitive switch device ZD9B and diode D9B branch road again, connect and control J8 end points in the overload shutdown unit of the present invention, realize electrical network under-voltage protection or plug loose contact protection shutdown function.Can through behind the divider resistance R118/R119 with the self-defined end OPT of micro controller CPU interface.Can shield and show line voltage numerical value.The shutdown order after can handling by micro controller CPU, is sent in the overload detection source during overload, can realize ACOFF or DCOFF function.On stackable other positive source of secondary detection capacitor C 61 cold ends of tandem tap power supply induction reactance choking coil L (that is: switch transformer T).The pressure swing type Switching Power Supply then need not.Voltage-stabiliser tube D61 can have the resistance replacement.
[Fig. 4 example] suction type detection resources, principle is with [Fig. 5 example] positive-pressure type detection resources.[Fig. 4 example]: after diode U61 same polarity commutation capacitor C61 filtering; output suction type detection resources after the same polarity commutation capacitor C61 filtering; through voltage-stabiliser tube D61 and resistance R 118, R119 to power supply VCC dividing potential drop after; one the tunnel pass through pressure sensitive switch device D9 branch road again after; connect and control J8 end points in the overload shutdown unit of the present invention, realize electrical network under-voltage protection or plug loose contact protection shutdown function.After another road is passed through pressure sensitive switch device ZD9B and diode D9B branch road again, connect and control end points J7/J7B in the overload shutdown unit of the present invention, realize electrical network overvoltage shutdown function.Can through behind the divider resistance R118/R119 with the self-defined end OPT of micro controller CPU interface, can shield and show line voltage numerical value.
Claims (3)
1. peak over-current protection of switch voltage stabilization power adjusting pipe device; include switching mode power supply transformer (T); input end capacitor (Z); main output capacitor (C); the Switching Power Supply adjustment pipe (V) that is connected with input end capacitor (Z); photoelectrical coupler (N); the steady control loop (4) that is connected with photoelectrical coupler (N); it is characterized in that: serial connection peak value overcurrent sample resistance (R3) on Switching Power Supply adjustment pipe (V) major loop; Switching Power Supply adjustment pipe (V) major loop also is connected in the base stage of whole keyholed back plate (VN) by diode (V35) branch road; steady control loop (4) is connected to whole keyholed back plate (VN) by photoelectrical coupler (N); by the break-make of whole keyholed back plate (VN) modulating switch power source adjustment pipe (V), thereby realize peak over-current protection.
2. according to the described peak over-current protection of switch voltage stabilization power adjusting pipe device of claim 1, it is characterized in that: switching mode power supply transformer (T) secondary, after second diode (U61) and same polarity commutation capacitor (C61) filtering, form the positive-pressure type detection resources, pass through the dividing potential drop of voltage-stabiliser tube (D61) and first resistance (R118), second resistance (R119) again, wherein, an end ground connection of second resistance (R911); In addition, have a node to draw two branch roads between first resistance (R118) and second resistance (R119), wherein this two branch road connects an overload shutdown unit by the first pressure sensitive switch device (D9), the second pressure sensitive switch device (ZD9B) respectively.
3. according to the described peak over-current protection of switch voltage stabilization power adjusting pipe device of claim 1, it is characterized in that: switching mode power supply transformer (T) secondary, through output suction type detection resources after second diode (U61) and same polarity commutation capacitor (C61) filtering, pass through the dividing potential drop of voltage-stabiliser tube (D61) and first resistance (R118), second resistance (R119) again, wherein first resistance (R118) also connects power supply (VCC); In addition, draw between first resistance (R118) and second resistance (R119) branch road through the first pressure sensitive switch device (D9) after, connect an overload shutdown unit; And draw between voltage-stabiliser tube (D61) and second resistance (R119) branch road through the second pressure sensitive switch device (ZD9B) and the 3rd diode (D9B) after, be connected to described overload shutdown unit, realize electrical network overvoltage shutdown function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101679621A CN101017973B (en) | 2005-12-20 | 2006-12-20 | Peak over-current protection of switch voltage stabilization power adjusting pipe |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200520037481 | 2005-12-20 | ||
| CN200520037481.X | 2005-12-20 | ||
| CN2006101679621A CN101017973B (en) | 2005-12-20 | 2006-12-20 | Peak over-current protection of switch voltage stabilization power adjusting pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101017973A CN101017973A (en) | 2007-08-15 |
| CN101017973B true CN101017973B (en) | 2010-09-29 |
Family
ID=38726791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101679621A Expired - Fee Related CN101017973B (en) | 2005-12-20 | 2006-12-20 | Peak over-current protection of switch voltage stabilization power adjusting pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101017973B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267100B (en) * | 2008-01-15 | 2012-12-26 | 深圳创维－Rgb电子有限公司 | Exception protection device for negative and positive dual power supply circuit |
| CN101582632A (en) | 2008-05-12 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | Switching power supply and electric equipment using switching power supply |
| CN103887762B (en) * | 2013-03-01 | 2017-02-15 | 上海富欣智能交通控制有限公司 | Tunable output channel delay self-recovery over-current protection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2261682Y (en) * | 1995-10-20 | 1997-09-03 | 陈金革 | Overvoltage and overcurrent protector for telephone |
| CN1466255A (en) * | 2002-06-29 | 2004-01-07 | 深圳市中兴通讯股份有限公司 | Output overcurrent and short circuit protector for high power contravariant equipment |
| CN2694669Y (en) * | 2004-04-01 | 2005-04-20 | 深圳创维－Rgb电子有限公司 | TV set overload switching-off apparatus |
-
2006
- 2006-12-20 CN CN2006101679621A patent/CN101017973B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2261682Y (en) * | 1995-10-20 | 1997-09-03 | 陈金革 | Overvoltage and overcurrent protector for telephone |
| CN1466255A (en) * | 2002-06-29 | 2004-01-07 | 深圳市中兴通讯股份有限公司 | Output overcurrent and short circuit protector for high power contravariant equipment |
| CN2694669Y (en) * | 2004-04-01 | 2005-04-20 | 深圳创维－Rgb电子有限公司 | TV set overload switching-off apparatus |
Non-Patent Citations (2)
| Title |
|---|
| CN 1466255 A,全文. |
| JP平9-70136A 1997.03.11 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101017973A (en) | 2007-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207625446U (en) | Switching power circuit | |
| CN100483911C (en) | Switching power supply with storage capacitance and power regulation | |
| TW583819B (en) | Apparatus and method of detecting circuit abnormality and protection for power converter | |
| CN101017973B (en) | Peak over-current protection of switch voltage stabilization power adjusting pipe | |
| CN105451409B (en) | The straight tube LED power of compatible inductance, electric ballast | |
| CN102548095B (en) | Lamp and driving circuit thereof | |
| CN102594193A (en) | Self-excitation push-pull converter | |
| CN203301135U (en) | Over-heat protection circuit of flyback switching power supply having input voltage compensation function | |
| CN206341456U (en) | LED drive power and system | |
| CN107294393A (en) | A kind of low cost and high reliability Yi nationality medicine production isolation type switch power | |
| CN109639151A (en) | Constant-current control circuit and constant current control method for LLC resonant converter | |
| CN106887904A (en) | A kind of wireless electric energy transmission device with overvoltage protection | |
| CN201171186Y (en) | Switch power supply type electric screwdriver power supply | |
| CN102810986B (en) | A kind of series topology LED switch power circuit | |
| CN101471605B (en) | Power supply circuit | |
| CN114123804A (en) | Ignition and fire detection circuit, ignition and fire detection device and gas device | |
| CN205232030U (en) | Input undervoltage protection circuit and switching power supply | |
| CN210297565U (en) | Alternating current-direct current wide input voltage regulating circuit and driver | |
| CN114859108A (en) | Bidirectional zero-crossing detection circuit and method | |
| CN207692089U (en) | Power circuit and its lighting apparatus | |
| CN216490236U (en) | Ignition and fire detection circuit, ignition and fire detection device and gas device | |
| CN202206596U (en) | Stable LED drive power supply | |
| CN204835967U (en) | High efficiency notebook AC -DC adapter | |
| CN102882387B (en) | Alternating-current contactor energy-saving protective device | |
| CN221328821U (en) | Complementary push-pull circuit of switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100929 Termination date: 20151220 |
|
| EXPY | Termination of patent right or utility model |