CN209283114U - One kind being suitable for audio-video switch power circuit - Google Patents
One kind being suitable for audio-video switch power circuit Download PDFInfo
- Publication number
- CN209283114U CN209283114U CN201821822730.XU CN201821822730U CN209283114U CN 209283114 U CN209283114 U CN 209283114U CN 201821822730 U CN201821822730 U CN 201821822730U CN 209283114 U CN209283114 U CN 209283114U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- pin
- chip
- capacitor
- 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
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses one kind to be suitable for audio-video switch power circuit; including EMC filtering and current rectifying and wave filtering circuit, DC circuit, overload protection and governor circuit and conversion circuit, the EMC filtering and the end the firewire L inline fuse F1 varistor MOV1 in parallel with zero curve N-terminal in current rectifying and wave filtering circuit, capacitor CX1, resistance R1, R2, R3 and R4 parallel interface be attempted by one end of common mode inductance LF1.This is suitable for audio-video switch power circuit; ac input end passes through concatenated EMC filtering and current rectifying and wave filtering circuit and conversion circuit to the main side of transformer T1A; transformer T1A pair end connects output rectification filter unit to DC circuit; EMC filtering and current rectifying and wave filtering circuit are additionally coupled to overload protection and governor circuit; it exports the conversion circuit being connected to; overload protection and governor circuit are by a photoelectrical coupler to overload detection route and adjustment of load feedback unit; carry out Switching Power Supply work; the functions such as protection are realized in control.
Description
Technical field
The utility model relates to switching power circuit technical fields, specially a kind of to be suitable for audio-video switch power supply line
Road.
Background technique
Switching power circuit is the time ratio turned on and off using modern power electronics technology control switch pipe, is maintained
A kind of power supply stabilized the output voltage.Have in existing switching circuit and is formed by overlapping using logic gates plus peripheral circuit
, poor reliability, element coherence request is high, and peripheral cell quantity is more, the problems such as protection circuit parameter consistency difference, low
Frequency ripple factor is larger, and can be coupled to secondary side by high frequency transformer.In addition, existing switching circuit does not have unloaded function
Control function is consumed, secondary side rectification circuit uses traditional Schottky diode rectification circuit, and when high current has certain
Power consumption, circuit fever is serious, influences the reliability of long-term work, and power supply overall efficiency will receive influence and reduce.Switch electricity
The operational reliability and quality of source circuit have very important significance for improving power quality and reliability.Due to switch electricity
Source configuration is complicated, serious to will affect electricity consumption and set wherein the damage of several elements may cause scrapping for entire Switching Power Supply
Standby service life causes huge waste.
Utility model content
The purpose of this utility model is to provide one kind to be suitable for audio-video switch power circuit, has and carries out Switching Power Supply
The advantages of work, control, the functions such as realization protection, solve the problems of the prior art.
To achieve the above object, the utility model provides the following technical solutions: one kind being suitable for audio-video switch power supply line
Road, including EMC filtering and current rectifying and wave filtering circuit, DC circuit, overload protection and governor circuit and conversion circuit, the EMC
Filtering and the end the firewire L inline fuse F1 varistor MOV1 in parallel with zero curve N-terminal in current rectifying and wave filtering circuit, capacitor CX1,
The parallel interface of resistance R1, R2, R3 and R4 are attempted by one end of common mode inductance LF1, the other end of common mode inductance LF1 respectively with it is whole
The both ends input voltage AC of stream bridge heap BD1 connect, anode and cathode the difference shunt capacitance EC1 and capacitor of rectifier bridge stack BD1
C4, one termination transformer T1A the end 1pin, the other end altogether, the end 1pin of transformer T1A also connecting resistance R13, R12, R10, R8
With the parallel interface of R5, series capacitance C3 is connect in resistance R9, resistance R7 and diode D10 after resistance R13 and the R12 other end are in parallel
Parallel interface on, resistance R5 series resistance R6 connects on the pin 1 of switching power source chip U1 in conversion circuit, transformer T1A's
Capacitor C7 in the Jie DC circuit of the end 10pin, resistance R16, field-effect tube Q2 drain electrode and resistance R14 parallel interface, capacitor C7
Connect on the pin 6 and 1 of interface chip U2 respectively with the resistance R16 other end, the sources connected in parallel resistance R14 of field-effect tube Q2 and
Capacitor C4 connects in drain electrode, and the drain series resistance R15 and grid of field-effect tube Q2 connects the pin 4 in interface chip U2 respectively
On 5, the 3 series capacitance D5 of pin of interface chip U2 connects the pin 7 of the source of stable pressure U3 in overload protection and governor circuit 3
On.
Preferably, the drain electrode of the pin 5 and 7 of the overload protection and the source of stable pressure U3 in governor circuit and field-effect tube Q2
Shunt capacitance EC4, EC4 connect on one end of common mode inductance LF2, another positive and negative anodes for terminating at voltage of common mode inductance LF2, surely
The pin 1 of potential source U3 connects the parallel interface of the 9pin and resistance R27 of transformer T1A, and the other end series capacitance C1 of resistance R27 connects
On the parallel interface of pin 7 and 8, the pin 6 of source of stable pressure U3 is connect in common mode inductance LF2, resistance R25 and zener diode ZD1
Parallel interface connect, other end series resistance R18 connecting resistance R23 and U5A the synchronous rectification chip of zener diode ZD1 and
The parallel interface of connecting port, another terminating resistor R24, R26 and R27 of resistance R25 connects on optocoupler U4, and resistance R23 and U5A is same
The capacitor C9 of the step rectification chip other end and the series resistance R24 other end connects on one end of optocoupler U4, and resistance R26 and R27 is another
One end and optocoupler U4 ground connection.
Preferably, the shunt capacitance of pin 1 and 5 C4 of the switching power source chip U1 in the conversion circuit, capacitor C5, two poles
Pipe D4, capacitor C10, diode D12 and resistance R19 connect on 4, the 5pin of transformer T1A, the pin 2 of switching power source chip U1
With the parallel interface of pin 3 parallel resistance R31, U1B and capacitor C14, the also series resistance of switching power source chip U1 pin 2 and 3
R32 connects on the 5pin of transformer T1A, 6 series resistance R28 parallel diode D9 of switching power source chip U1 pin, resistance R29
The grid of scene effect pipe Q1 is connect with resistance R35 parallel interface, switching power source chip U1 pin 4 meets capacitor C15 and resistance R30
And interface, another terminating resistor R20 of resistance R30, resistance R21, resistance R30, R35 and resistance R22 parallel interface connect
Ground.
Preferably, the chip type of the switching power source chip U1 is OB2362, and the chip type of source of stable pressure U3 is
TL431。
Compared with prior art, the beneficial effects of the utility model are as follows:
This is suitable for audio-video switch power circuit, and ac input end is filtered by concatenated EMC and current rectifying and wave filtering circuit
With conversion circuit to the main side of transformer T1A, transformer T1A pair end connects output rectification filter unit to DC circuit, EMC filter
Involve current rectifying and wave filtering circuit and be additionally coupled to overload protection and governor circuit, export the conversion circuit being connected to, overload protection and
Governor circuit is by photoelectrical coupler to overload detection route and adjustment of load feedback unit, the overload detection route and negative
It carries adjustment feedback unit and is connected to the output rectification filter unit, carry out Switching Power Supply work, the function such as protection are realized in control
Energy.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
In figure: 1, EMC filtering and current rectifying and wave filtering circuit；2, DC circuit；3, overload protection and governor circuit；4, conversion electricity
Road.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
It is suitable for audio-video switch power circuit referring to Fig. 1, a kind of, including EMC filtering and current rectifying and wave filtering circuit 1, straight
Current circuit 2, overload protection and governor circuit 3 and conversion circuit 4, EMC filtering and current rectifying and wave filtering circuit 1 in the end firewire L string
Connection fuse F1 varistor MOV1 in parallel with zero curve N-terminal, capacitor CX1, resistance R1, R2, R3 and R4 parallel interface be attempted by
One end of common mode inductance LF1, the other end of common mode inductance LF1 connects with the both ends input voltage AC of rectifier bridge stack BD1 respectively, whole
Flow the anode and cathode difference shunt capacitance EC1 and capacitor C4 of bridge heap BD1, the end 1pin of a termination transformer T1A, the other end
Altogether, the end 1pin of the transformer T1A also parallel interface of connecting resistance R13, R12, R10, R8 and R5, resistance R13 and the R12 other end
Series capacitance C3 connects on the parallel interface of resistance R9, resistance R7 and diode D10 after parallel connection, and resistance R5 series resistance R6 switches through
It changes on the pin 1 of switching power source chip U1 in circuit 4, capacitor C7, electricity in the end the 10pin Jie DC circuit 2 of transformer T1A
The parallel interface of R16, field-effect tube Q2 drain electrode and resistance R14 is hindered, capacitor C7 and the resistance R16 other end are connect respectively in interface chip
On the pin 6 and 1 of U2, the sources connected in parallel resistance R14 and capacitor C4 of field-effect tube Q2 is connect in drain electrode, the leakage of field-effect tube Q2
Pole series resistance R15 and grid are connect respectively on the pin 4 and 5 of interface chip U2,3 series capacitance of pin of interface chip U2
D5 connects on the pin 7 of the source of stable pressure U3 in overload protection and governor circuit 3.
The pin 5 and 7 of source of stable pressure U3 in overload protection and governor circuit 3 and the drain electrode shunt capacitance of field-effect tube Q2
EC4, EC4 connect on one end of common mode inductance LF2, another positive and negative anodes for terminating at voltage of common mode inductance LF2, source of stable pressure U3's
Pin 1 connects the parallel interface of the 9pin and resistance R27 of transformer T1A, and the other end series capacitance C1 of resistance R27 connects in pin 7
On 8 parallel interface, the pin 6 of source of stable pressure U3 connects ZD1's and to be coupled in common mode inductance LF2, resistance R25 and zener diode
Mouth connects, the parallel interface of other end series resistance R18 connecting resistance R23 and U5A the synchronous rectification chip of zener diode ZD1,
The parallel interface of another terminating resistor R24, R26 and R27 of resistance R25 connect on optocoupler U4, resistance R23 and U5A synchronous rectification
The capacitor C9 of the chip other end and the series resistance R24 other end connects on one end of optocoupler U4, resistance R26 and the R27 other end and
Optocoupler U4 ground connection.
The chip type of switching power source chip U1 is OB2362, and the chip type of source of stable pressure U3 is TL431, conversion circuit 4
In switching power source chip U1 the shunt capacitance of pin 1 and 5 C4, capacitor C5, diode D4, capacitor C10, diode D12 and electricity
Resistance R19 connects on 4, the 5pin of transformer T1A, the pin 2 and pin 3 parallel resistance R31, U1B and electricity of switching power source chip U1
Hold the parallel interface of C14, the also series resistance R32 of switching power source chip U1 pin 2 and 3 connects on the 5pin of transformer T1A, switchs
6 series resistance R28 parallel diode D9 of power supply chip U1 pin, resistance R29 and resistance R35 parallel interface meet scene effect pipe Q1
Grid, switching power source chip U1 pin 4 connect capacitor C15 and resistance R30's and interface, another terminating resistor of resistance R30
The parallel interface ground connection of R20, resistance R21, resistance R30, R35 and resistance R22.
Working principle: ac input end passes through concatenated EMC filtering and current rectifying and wave filtering circuit 1 and conversion circuit 4 to transformation
The main side of device T1A, transformer T1A pair end connect output rectification filter unit to DC circuit 2, EMC filtering and rectifying and wave-filtering electricity
Road 1 is additionally coupled to overload protection and governor circuit 3, exports the conversion circuit 4 being connected to, and overload protection and governor circuit 3 pass through
A photoelectrical coupler to overload detection route and adjustment of load feedback unit, the overload detection route and adjustment of load is crossed to feed back
The output rectification filter unit that unit is connected to, including F1- fuse, MOV- varistor, CX1-X capacitor, LF1- common mode electricity
Sense, DB1- bridge heap, EC1- capacitor CY1, CY2-Y capacitor, U2- chip, U4- optocoupler, U3-TL431, U4- synchronous rectification chip,
U5-T synchronous rectification chip composition.Three end adjustable shunt reference source U3-TL431, R2- resistance and transformer 9Pin connect, F1-
It connects between one end and input voltage AC of L, MOV- varistor connects between L and N, connects BD1- bridge by LF1- common mode inductance
Heap is the EC1 anode of another termination of pulsating current after knot gap bridge heap rectification, and cathode connects EC1 cathode, by C5- capacitor charging, allows
One termination TI transformer 2Pin, T1- transformer conversion exchange of U2 job control Q1-MOS work is followed by one end after U4- synchronous rectification
U3-TL41 is met, three end adjustable shunt reference sources carry out Switching Power Supply work by U4- opto-coupled feedback to U2- chip, and control is real
The now functions such as protection.
In summary: this be suitable for audio-video switch power circuit, ac input end by concatenated EMC filter and it is whole
Flow filter circuit 1 and conversion circuit 4 to the main side of transformer T1A, transformer T1A pair end connects output rectification filter unit to straight
Current circuit 2, EMC filtering and current rectifying and wave filtering circuit 1 are additionally coupled to overload protection and governor circuit 3, export the conversion being connected to
Circuit 4, overload protection and governor circuit 3 by a photoelectrical coupler to overload detection route and adjustment of load feedback unit,
The overload detection route and adjustment of load feedback unit are connected to the output rectification filter unit, carry out Switching Power Supply work
Make, the functions such as protection are realized in control.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (4)
1. one kind be suitable for audio-video switch power circuit, including EMC filtering and current rectifying and wave filtering circuit (1), DC circuit (2),
Overload protection and governor circuit (3) and conversion circuit (4), it is characterised in that: the EMC filtering and current rectifying and wave filtering circuit (1)
In the end firewire L inline fuse F1 varistor MOV1 in parallel with zero curve N-terminal, capacitor CX1, resistance R1, R2, R3 and R4 and
Connecting port is attempted by one end of common mode inductance LF1, the other end of the common mode inductance LF1 input voltage with rectifier bridge stack BD1 respectively
The both ends AC connect, anode and cathode the difference shunt capacitance EC1 and capacitor C4 of rectifier bridge stack BD1, a termination transformer T1A's
The end 1pin, the other end altogether, the end 1pin of the transformer T1A also parallel interface of connecting resistance R13, R12, R10, R8 and R5, resistance
Series capacitance C3 connects on the parallel interface of resistance R9, resistance R7 and diode D10 after R13 the and R12 other end is in parallel, resistance R5
Series resistance R6 connects in conversion circuit (4) on the pin 1 of switching power source chip U1, the end the 10pin Jie direct current of transformer T1A
Capacitor C7 in road (2), resistance R16, field-effect tube Q2 drain electrode and resistance R14 parallel interface, capacitor C7 and the resistance R16 other end
It being connect on the pin 6 and 1 of interface chip U2 respectively, the sources connected in parallel resistance R14 and capacitor C4 of field-effect tube Q2 connects in drain electrode,
The drain series resistance R15 and grid of field-effect tube Q2 is connect respectively on the pin 4 and 5 of interface chip U2, interface chip U2's
3 series capacitance D5 of pin connects on the pin 7 of the source of stable pressure U3 in overload protection and governor circuit (3).
2. according to claim 1 a kind of suitable for audio-video switch power circuit, it is characterised in that: the overload protection
And the pin 5 and 7 of the source of stable pressure U3 in governor circuit (3) and drain electrode shunt capacitance EC4, EC4 of field-effect tube Q2 connect in common mode
One end of inductance LF2, on another positive and negative anodes for terminating at voltage of common mode inductance LF2, the pin 1 of source of stable pressure U3 connects transformer
The other end series capacitance C1 of the parallel interface of the 9pin and resistance R27 of T1A, resistance R27 connects the parallel interface in pin 7 and 8
On, the pin 6 of source of stable pressure U3 connects the parallel interface in common mode inductance LF2, resistance R25 and zener diode ZD1 and connects, pressure stabilizing two
The parallel interface of other end series resistance R18 connecting resistance R23 and U5A the synchronous rectification chip of pole pipe ZD1, resistance R25's is another
The parallel interface of terminating resistor R24, R26 and R27 connect on optocoupler U4, resistance R23 and U5A the synchronous rectification chip other end and string
The capacitor C9 of the connection resistance R24 other end connects on one end of optocoupler U4, resistance R26 and the R27 other end and optocoupler U4 ground connection.
3. according to claim 1 a kind of suitable for audio-video switch power circuit, it is characterised in that: the conversion circuit
(4) shunt capacitance of pin 1 and 5 C4 of the switching power source chip U1 in, capacitor C5, diode D4, capacitor C10, diode D12 and
Resistance R19 connects on 4, the 5pin of transformer T1A, the pin 2 and pin 3 parallel resistance R31, U1B of switching power source chip U1 and
The parallel interface of capacitor C14, the also series resistance R32 of switching power source chip U1 pin 2 and 3 connect on the 5pin of transformer T1A, open
Powered-down 6 series resistance R28 parallel diode D9 of source chip U1 pin, resistance R29 and resistance R35 parallel interface connect scene effect pipe
The grid of Q1, switching power source chip U1 pin 4 connect capacitor C15 and resistance R30's and interface, another terminating resistor of resistance R30
The parallel interface ground connection of R20, resistance R21, resistance R30, R35 and resistance R22.
4. according to claim 1 a kind of suitable for audio-video switch power circuit, it is characterised in that: the Switching Power Supply
The chip type of chip U1 is OB2362, and the chip type of source of stable pressure U3 is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821822730.XU CN209283114U (en) | 2018-11-06 | 2018-11-06 | One kind being suitable for audio-video switch power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821822730.XU CN209283114U (en) | 2018-11-06 | 2018-11-06 | One kind being suitable for audio-video switch power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209283114U true CN209283114U (en) | 2019-08-20 |
Family
ID=67600384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821822730.XU Expired - Fee Related CN209283114U (en) | 2018-11-06 | 2018-11-06 | One kind being suitable for audio-video switch power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209283114U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111697858A (en) * | 2020-07-15 | 2020-09-22 | 东莞市大忠电子有限公司 | Water purifier power adapter with vehicle-mounted AC/DC input |
| CN114614444A (en) * | 2022-04-12 | 2022-06-10 | 青岛理工大学 | High-power supply with overcurrent voltage reduction function |
| CN114785163A (en) * | 2021-12-17 | 2022-07-22 | 深圳市金牛鑫科技有限公司 | High-efficiency power transformer |
-
2018
- 2018-11-06 CN CN201821822730.XU patent/CN209283114U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111697858A (en) * | 2020-07-15 | 2020-09-22 | 东莞市大忠电子有限公司 | Water purifier power adapter with vehicle-mounted AC/DC input |
| CN114785163A (en) * | 2021-12-17 | 2022-07-22 | 深圳市金牛鑫科技有限公司 | High-efficiency power transformer |
| CN114614444A (en) * | 2022-04-12 | 2022-06-10 | 青岛理工大学 | High-power supply with overcurrent voltage reduction function |
| CN114614444B (en) * | 2022-04-12 | 2024-01-05 | 青岛理工大学 | High-power supply with overcurrent and buck functions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209283114U (en) | One kind being suitable for audio-video switch power circuit | |
| CN102065610B (en) | LED (Light Emitting Diode) lamp control circuit | |
| CN201435845Y (en) | LED lamp circuit with high power factor | |
| CN204761146U (en) | Bimodulus power supply | |
| CN104754840A (en) | Novel LED driving power supply | |
| CN102520241A (en) | Three-phase charge-controlled electric energy meter based on resistance-capacitance voltage reduction and low-voltage direct-current/direct-current (DC/DC) power supply | |
| CN209001595U (en) | Voltage dip controlling device | |
| CN206832896U (en) | A kind of three-phase power input phase-loss detection circuit | |
| CN203871274U (en) | Energy-saving resistive-capacitive step-down relay control circuit | |
| CN106933290B (en) | The intelligent high-precision voltage stabilizing device of adaptive wide dynamic power | |
| CN206135430U (en) | Miniature photovoltaic grid -connected inverter | |
| CN204794736U (en) | Novel half -wave rectifier circuit | |
| CN202178711U (en) | Dual supply output circuit possessing ultralow no-load power consumption and high efficiency under low load | |
| CN207399162U (en) | Intelligent switch | |
| CN207625441U (en) | A kind of soft starting circuit of anti-over-pressed, under-voltage surge | |
| CN203104307U (en) | Controllable common ground power supply circuit | |
| CN207573240U (en) | A kind of electric precipitator high frequency electric source | |
| CN202870502U (en) | Anti-electricity-stealing controller | |
| CN107086769A (en) | One kind matches somebody with somebody the low apparent power digital circuit of network source | |
| CN208078681U (en) | A kind of intelligent power system | |
| CN205911962U (en) | High efficiency switching power supply | |
| CN207039449U (en) | A kind of single inductance is without bridge APFC circuits | |
| CN206807284U (en) | A kind of non-bridge PFC circuits | |
| CN208386414U (en) | A kind of PFC control circuit | |
| CN207992308U (en) | The voltage detecting circuit and power supply of pfc circuit module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190820 Termination date: 20191106 |