CN204119057U - A kind of power supply adaptor control circuit of Set Top Box - Google Patents
A kind of power supply adaptor control circuit of Set Top Box Download PDFInfo
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- CN204119057U CN204119057U CN201420455984.8U CN201420455984U CN204119057U CN 204119057 U CN204119057 U CN 204119057U CN 201420455984 U CN201420455984 U CN 201420455984U CN 204119057 U CN204119057 U CN 204119057U
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- power supply
- wave filtering
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Abstract
The utility model provides a kind of power supply adaptor control circuit of Set Top Box, comprise: power supply input circuit, current rectifying and wave filtering circuit, power conversion circuit, secondary filtering circuit, controlling circuit of voltage regulation and ON-OFF control circuit, the output of described input circuit connects described current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described power conversion circuit, the output of described power conversion circuit connects described secondary current rectifying and wave filtering circuit, the output of described secondary current rectifying and wave filtering circuit connects described controlling circuit of voltage regulation, the output connecting valve control circuit of described controlling circuit of voltage regulation, the output of described ON-OFF control circuit is connected to the input of power conversion circuit, the output of described secondary current rectifying and wave filtering circuit is output circuit.Control circuit structure of the present utility model is simple, low cost of manufacture, strong interference immunity, realizes switch control rule, absorb peak voltage by feedback circuit, improves the stability of power supply.
Description
Technical field
The utility model relates to a kind of power supply adaptor, particularly a kind of power supply adaptor control circuit of Set Top Box.
Background technology
Along with the scientific and technological develop rapidly of society, the audio-visual equipment of people's life & amusement also constantly updates the replacement, early stage traditional analog television progressively steps down from the stage of history, television terminal is relied on to provide the home appliance of integrated information business, make user can watch digital television program on a television set, and carry out interactive digital amusement by network, the Set Top Box of education and commercialization activity also enters each household family gradually, and existing Set Top Box power supply adaptor peak load in use easily causes power supply adaptor to damage.
Utility model content
The utility model, for the technical problem of above-mentioned existence, proposes a kind of power supply adaptor control circuit of Set Top Box, solves the problem that Set Top Box power supply adaptor peak load in use causes power supply adaptor to damage.
The technical solution of the utility model is: a kind of power supply adaptor control circuit of Set Top Box, comprise: power supply input circuit, current rectifying and wave filtering circuit, power conversion circuit, secondary filtering circuit, controlling circuit of voltage regulation and ON-OFF control circuit, the output of described input circuit connects described current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described power conversion circuit, the output of described power conversion circuit connects described secondary current rectifying and wave filtering circuit, the output of described secondary current rectifying and wave filtering circuit connects described controlling circuit of voltage regulation, the output connecting valve control circuit of described controlling circuit of voltage regulation, the output of described ON-OFF control circuit is connected to the input of power conversion circuit, the output of described secondary current rectifying and wave filtering circuit is output circuit.
Further, described input circuit comprises protective tube FU1 and electromagnetic interface filter, and described protective tube is connected on incoming line, on described electromagnetic interface filter incoming line in parallel.
Further, described current rectifying and wave filtering circuit is made up of rectifier bridge D1 ~ D4, inductance L 1, inductance L 2, electric capacity C1, electric capacity C2, shunt capacitance C1 on the output of described rectifier bridge D1 ~ D4, described electric capacity C1 two ends series inductance L1 and inductance L 2, shunt capacitance C3 on the output of described inductance L 1 and inductance L 2.
Further, described power conversion circuit comprises drain electrode clamp circuit, transformer and ON-OFF control circuit, described drain electrode clamp circuit is made up of resistance R1 ~ R3, blocking diode D5 and electric capacity C4, connects after described resistance R1, resistance R2 and electric capacity V4 parallel connection with blocking diode D5 and resistance R3.
Further, the output of described transformer arranges two secondary winding, and the output of described secondary winding connects rectifying tube, RC absorbing circuit in parallel on described rectifying tube.
Further; described output filter is made up of electric capacity C10, electric capacity C11, inductance L 4 and electric capacity C12; described voltage stabilizing circuit is made up of resistance R12 ~ R15, electric capacity C13, photoelectrical coupler IC2 and pressurizer IC3; described ON-OFF control circuit is made up of power management chip IC1 and overvoltage crowbar, and described voltage stabilizing circuit is connected by photoelectrical coupler IC2 with described ON-OFF control circuit.
The beneficial effects of the utility model: extraneous power supply enters into current rectifying and wave filtering circuit by power supply input circuit and carries out rectifying and wave-filtering to alternating voltage, by transformer to output secondary voltage, by output filter circuit, filtering is carried out to the direct voltage exported, FEEDBACK CONTROL is carried out by controlling circuit of voltage regulation and ON-OFF control circuit, this control circuit structure is simple, low cost of manufacture, strong interference immunity, switch control rule is realized by feedback circuit, peak voltage is absorbed, improves the stability of power supply.
Accompanying drawing explanation
Fig. 1 is the power supply adaptor control structure figure of a kind of Set Top Box that the utility model proposes.
Fig. 2 is the power supply adaptor control circuit figure of a kind of Set Top Box that the utility model proposes.
Embodiment
See Fig. 1 and Fig. 2, the wherein power supply adaptor control circuit figure of Fig. 1 to be the power supply adaptor control structure figure of a kind of Set Top Box that the utility model proposes, Fig. 2 be a kind of Set Top Box that the utility model proposes.
As Fig. 1, shown in Fig. 2, a kind of power supply adaptor control circuit of Set Top Box, comprise: power supply input circuit, current rectifying and wave filtering circuit, power conversion circuit, secondary filtering circuit, controlling circuit of voltage regulation and ON-OFF control circuit, the output of described input circuit connects described current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described power conversion circuit, the output of described power conversion circuit connects described secondary current rectifying and wave filtering circuit, the output of described secondary current rectifying and wave filtering circuit connects described controlling circuit of voltage regulation, the output connecting valve control circuit of described controlling circuit of voltage regulation, the output of described ON-OFF control circuit is connected to the input of power conversion circuit, the output of described secondary current rectifying and wave filtering circuit is output circuit.
Described input circuit comprises protective tube FU1 and electromagnetic interface filter, and described protective tube is connected on incoming line, on described electromagnetic interface filter incoming line in parallel.
Described current rectifying and wave filtering circuit is made up of rectifier bridge D1 ~ D4, inductance L 1, inductance L 2, electric capacity C1, electric capacity C2, shunt capacitance C1 on the output of described rectifier bridge D1 ~ D4, described electric capacity C1 two ends series inductance L1 and inductance L 2, shunt capacitance C3 on the output of described inductance L 1 and inductance L 2.
Described power conversion circuit comprises drain electrode clamp circuit, transformer and ON-OFF control circuit, described drain electrode clamp circuit is made up of resistance R1 ~ R3, blocking diode D5 and electric capacity C4, connects after described resistance R1, resistance R2 and electric capacity V4 parallel connection with blocking diode D5 and resistance R3.Blocking diode D5 selects FR107 type 1A/1000V fast recovery diode.
The output of described transformer arranges two secondary winding, and the output of described secondary winding connects rectifying tube, RC absorbing circuit in parallel on described rectifying tube.Shunt by arranging the output of secondary winding to secondary side, reduce the loss of output rectification filter device, improve power-efficient, rectifying tube D7 and D8 all adopts SS23 type 2A/30V Schottky diode, on every rectifying tube, RC absorbing circuit all in parallel, plays inhibitory action to switching noise.
Described output filter is made up of electric capacity C10, electric capacity C11, inductance L 4 and electric capacity C12, described voltage stabilizing circuit is made up of resistance R12 ~ R15, electric capacity C13, photoelectrical coupler IC2 and pressurizer IC3, when the 5V of output changes, first sampling voltage is obtained after R14, R15 dividing potential drop, then after comparing with the 2.5V bandgap voltage reference in pressurizer IC3, the cathode potential of pressurizer IC3 is changed, carried out the switch periods of the MOSFET of control integration inside circuit again by photoelectrical coupler IC2, finally realize voltage stabilizing object.
Described ON-OFF control circuit is made up of power management chip IC1 and overvoltage crowbar, and resistance R4, resistance R5, resistance C5, resistance C6, voltage-stabiliser tube VD1, photoelectrical coupler IC2 form.Power management chip IC1 in the utility model adopts TNY377P, photoelectrical coupler IC2 to adopt PC817A, and pressurizer IC3 adopts LM431.
Be made up of the EMI common mode rejection circuit of power input together with inductance L 1 electric capacity C1, its effect one is the differential mode noise of attenuator switch power supply, reduces the emittance of EMI.Its effect two is the common-mode noise amplitudes suppressing Switching Power Supply, reduces the conducted interference of Switching Power Supply.
The output of described power amplification circuit arranges peak voltage absorbing circuit, the operating frequency of power management chip TNY377P is 132KHz, it has unique peak value shaping modes, under peak load condition, limiting current can be increased by 30%, and switching frequency increasing is twice, reach 264KHz, and without the need to realizing peak power output by increasing high frequency transformer magnetic core size.Described overvoltage crowbar is made up of pressurizer IC3 and resistance R7; under normality, pressurizer IC3 is in cut-off state; once output voltage exceeds the voltage stabilized range of regulation; there is overvoltage fault; biased winding voltage increases; VD1 is reversed rapidly and punctures and enter voltage stabilizing state; now the electric current of the BP/M end of the TNY377P of power management chip also increases; when electric current just turns off TNY377P immediately more than during 7mA; until after BP/M terminal voltage drops to 4.8V after disconnecting interchange input, normal work could be recovered.
Extraneous power supply enters into current rectifying and wave filtering circuit by power supply input circuit and carries out rectifying and wave-filtering to alternating voltage, by transformer to output secondary voltage, by output filter circuit, filtering is carried out to the direct voltage exported, FEEDBACK CONTROL is carried out by controlling circuit of voltage regulation and ON-OFF control circuit, this control circuit structure is simple, low cost of manufacture, strong interference immunity, realize switch control rule by feedback circuit, peak voltage is absorbed, improve the stability of power supply.
Claims (6)
1. the power supply adaptor control circuit of a Set Top Box, it is characterized in that, comprise: power supply input circuit, current rectifying and wave filtering circuit, power conversion circuit, secondary filtering circuit, controlling circuit of voltage regulation and ON-OFF control circuit, the output of described input circuit connects described current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described power conversion circuit, the output of described power conversion circuit connects described secondary current rectifying and wave filtering circuit, the output of described secondary current rectifying and wave filtering circuit connects described controlling circuit of voltage regulation, the output connecting valve control circuit of described controlling circuit of voltage regulation, the output of described ON-OFF control circuit is connected to the input of power conversion circuit, the output of described secondary current rectifying and wave filtering circuit is output circuit.
2. the power supply adaptor control circuit of a kind of Set Top Box according to claim 1, is characterized in that, described input circuit comprises protective tube FU1 and electromagnetic interface filter, and described protective tube is connected on incoming line, on described electromagnetic interface filter incoming line in parallel.
3. the power supply adaptor control circuit of a kind of Set Top Box according to claim 1, it is characterized in that, described current rectifying and wave filtering circuit is made up of rectifier bridge D1 ~ D4, inductance L 1, inductance L 2, electric capacity C1, electric capacity C2, shunt capacitance C1 on the output of described rectifier bridge D1 ~ D4, described electric capacity C1 two ends series inductance L1 and inductance L 2, shunt capacitance C3 on the output of described inductance L 1 and inductance L 2.
4. the power supply adaptor control circuit of a kind of Set Top Box according to claim 1, it is characterized in that, described power conversion circuit comprises drain electrode clamp circuit, transformer and ON-OFF control circuit, described drain electrode clamp circuit is made up of resistance R1 ~ R3, blocking diode D5 and electric capacity C4, connects after described resistance R1, resistance R2 and electric capacity V4 parallel connection with blocking diode D5 and resistance R3.
5. the power supply adaptor control circuit of a kind of Set Top Box according to claim 4, is characterized in that, the output of described transformer arranges two secondary winding, and the output of described secondary winding connects rectifying tube, RC absorbing circuit in parallel on described rectifying tube.
6. the power supply adaptor control circuit of a kind of Set Top Box according to claim 1; it is characterized in that; described output filter is made up of electric capacity C10, electric capacity C11, inductance L 4 and electric capacity C12; described voltage stabilizing circuit is made up of resistance R12 ~ R15, electric capacity C13, photoelectrical coupler IC2 and pressurizer IC3; described ON-OFF control circuit is made up of power management chip IC1 and overvoltage crowbar, and described voltage stabilizing circuit is connected by photoelectrical coupler IC2 with described ON-OFF control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420455984.8U CN204119057U (en) | 2014-08-14 | 2014-08-14 | A kind of power supply adaptor control circuit of Set Top Box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420455984.8U CN204119057U (en) | 2014-08-14 | 2014-08-14 | A kind of power supply adaptor control circuit of Set Top Box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204119057U true CN204119057U (en) | 2015-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420455984.8U Expired - Fee Related CN204119057U (en) | 2014-08-14 | 2014-08-14 | A kind of power supply adaptor control circuit of Set Top Box |
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| Country | Link |
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| CN (1) | CN204119057U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474210A (en) * | 2019-08-27 | 2019-11-19 | 京东方科技集团股份有限公司 | Socket control circuit, socket device and socket control method |
-
2014
- 2014-08-14 CN CN201420455984.8U patent/CN204119057U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474210A (en) * | 2019-08-27 | 2019-11-19 | 京东方科技集团股份有限公司 | Socket control circuit, socket device and socket control method |
| CN110474210B (en) * | 2019-08-27 | 2021-05-04 | 京东方科技集团股份有限公司 | Socket control circuit, socket device and socket control method |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20150121 Termination date: 20200814 |
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| CF01 | Termination of patent right due to non-payment of annual fee |