CN204481691U - Set Top Box power supply adaptor - Google Patents
Set Top Box power supply adaptor Download PDFInfo
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- CN204481691U CN204481691U CN201520151968.4U CN201520151968U CN204481691U CN 204481691 U CN204481691 U CN 204481691U CN 201520151968 U CN201520151968 U CN 201520151968U CN 204481691 U CN204481691 U CN 204481691U
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Abstract
The utility model relates to a kind of power supply adaptor, particularly Set Top Box power supply adaptor, comprise crest voltage compensation chips U1, ac power input end is connected with filter unit input by rectification unit, described filter unit output is connected with No. 1 pin of crest voltage compensation chips U1, and described filter unit is connected with No. 6, No. 7, No. 8 pins of crest voltage compensation chips U1 respectively by peak absorbing unit; Described peak absorbing unit output is connected with transformer T1 input, described transformer T1 comprises two secondary output ends, each secondary output end is connected with voltage jump limiting unit, is connected with switch switching unit between two secondary output ends of described transformer T1.After adopting said structure, when the utility model can make different alternating voltage input, maximum peak value electric current is consistent; The profit of transformer in power up can be reduced, prevent transformer saturated, can also accommodation limit peak current.
Description
Technical field
The utility model relates to a kind of power supply adaptor, particularly Set Top Box power supply adaptor.
Background technology
Power supply adaptor is the power supply conversion equipment of small portable electronic device and electronic apparatus, is generally made up of shell, power transformer and rectification circuit, can be divided into exchange output type and direct-current-output type by its output type; Direct Plug-In and Table top type can be divided into by connected mode.Extensively be matched in the equipment such as phone composite aircraft, game machine, language playback device, walkman, notebook computer, cell phone.
Chinese utility model patent CN 204119057 U discloses 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 second distillation filter circuit is output circuit.
Summary of the invention
The utility model technical issues that need to address are to provide a kind of Set Top Box power supply adaptor.
For solving above-mentioned technical problem, Set Top Box power supply adaptor of the present utility model comprises crest voltage compensation chips U1, ac power input end is connected with filter unit input by rectification unit, described filter unit output is connected with No. 1 pin of crest voltage compensation chips U1, and described filter unit is connected with No. 6, No. 7, No. 8 pins of crest voltage compensation chips U1 respectively by peak absorbing unit; Described peak absorbing unit output is connected with transformer T1 input, described transformer T1 comprises two secondary output ends, each secondary output end is connected with voltage jump limiting unit, is connected with switch switching unit between two secondary output ends of described transformer T1.
Further, described switch switching unit comprises metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2, be connected with the parallel circuits of resistance R17 and electric capacity C16 between the source electrode of described metal-oxide-semiconductor Q2 and grid, the drain electrode of the drain electrode output voltage V1 of described metal-oxide-semiconductor Q2, described metal-oxide-semiconductor Q2 is by electric capacity C5 ground connection; The grid of described metal-oxide-semiconductor Q2 is connected with diverter switch SW1 one end by resistance R24, and the other end of described diverter switch SW1 is connected with the drain electrode of metal-oxide-semiconductor Q1 by electric capacity C17, the source output voltage V2 of described metal-oxide-semiconductor Q1; The drain electrode of described metal-oxide-semiconductor Q1 by electric capacity C10 ground connection, the series circuit of described electric capacity C10 two ends parallel diode D10 and electric capacity C9, the intermediate connection point output voltage V3 of described diode D10 and electric capacity C9.
Further, described filter unit is the parallel circuits of electric capacity C1 and electric capacity C2.
Further, be connected with anti-lightning strike unit between described ac power input end and rectification unit, described anti-lightning strike unit comprises piezo-resistance VZ1 and fusible link F1; Described fusible link F1 one end is connected with ac power input end, and the other end is connected with rectification unit, and described piezo-resistance VZ1 is connected in parallel on rectification unit input.
Further, described peak absorbing unit is the buffer be made up of resistance R5, resistance R6, electric capacity C4 and diode D5, the positive pole of described diode D5 is connected with No. 6 of crest voltage compensation chips U1, No. 7, No. 8 pins, and the negative pole of described diode D5 is connected with filter unit output by the parallel circuits of resistance R5, resistance R6, electric capacity C4.
Further, described voltage jump limiting unit comprises diode D9, resistance R20 and electric capacity C15, the output of described transformer T1 is connected with the positive pole of diode D9, the two ends of described diode D9 are parallel with the series circuit of resistance R20 and electric capacity C15, and the negative pole of described diode D9 is voltage jump limiting unit output.
Further, described voltage jump limiting unit comprises diode D8, resistance R25 and electric capacity C14, the output of described transformer T1 is connected with the positive pole of diode D8, the two ends of described diode D8 are parallel with the series circuit of resistance R25 and electric capacity C14, and the negative pole of described diode D8 is voltage jump limiting unit output.
After adopting said structure, when the utility model can make different alternating voltage input, maximum peak value electric current is consistent; The profit of transformer in power up can be reduced, prevent transformer saturated, can also accommodation limit peak current.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the circuit theory diagrams of the utility model Set Top Box power supply adaptor.
In figure: 1 is anti-lightning strike unit, 2 is rectification unit, and 3 is filter unit, and 4 is peak absorbing unit, and 5 is voltage jump limiting unit, and 6 is switch switching unit
Embodiment
As shown in Figure 1, Set Top Box power supply adaptor of the present utility model comprises crest voltage compensation chips U1, ac power input end is connected with filter unit 3 input by rectification unit 2, described filter unit 3 output is connected with No. 1 pin of crest voltage compensation chips U1, and described filter unit is connected with No. 6, No. 7, No. 8 pins of crest voltage compensation chips U1 respectively by peak absorbing unit 4; Described peak absorbing unit 4 output is connected with transformer T1 input, described transformer T1 comprises two secondary output ends, each secondary output end is connected with voltage jump limiting unit 5, is connected with switch switching unit 6 between two secondary output ends of described transformer T1.
Further, described switch switching unit comprises metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2, be connected with the parallel circuits of resistance R17 and electric capacity C16 between the source electrode of described metal-oxide-semiconductor Q2 and grid, the drain electrode of the drain electrode output voltage V1 of described metal-oxide-semiconductor Q2, described metal-oxide-semiconductor Q2 is by electric capacity C5 ground connection; The grid of described metal-oxide-semiconductor Q2 is connected with diverter switch SW1 one end by resistance R24, and the other end of described diverter switch SW1 is connected with the drain electrode of metal-oxide-semiconductor Q1 by electric capacity C17, the source output voltage V2 of described metal-oxide-semiconductor Q1; The drain electrode of described metal-oxide-semiconductor Q1 by electric capacity C10 ground connection, the series circuit of described electric capacity C10 two ends parallel diode D10 and electric capacity C9, the intermediate connection point output voltage V3 of described diode D10 and electric capacity C9.
Further, described filter unit is the parallel circuits of electric capacity C1 and electric capacity C2.
Further, be connected with anti-lightning strike unit between described ac power input end and rectification unit, described anti-lightning strike unit comprises piezo-resistance VZ1 and fusible link F1; Described fusible link F1 one end is connected with ac power input end, and the other end is connected with rectification unit, and described piezo-resistance VZ1 is connected in parallel on rectification unit input.When there being thunderbolt, produce high pressure when electrical network imports power supply, the circuit be made up of piezo-resistance VZ1 and fusible link F1 is protected.When the voltage being added in piezo-resistance VZ1 two ends exceedes its operating voltage, its resistance reduces, and makes high-pressure energy consumption on piezo-resistance VZ1; If electric current is excessive, more than the fusing Zhi Time of F1, fusible link F1 fusing open circuit to protect late-class circuit element, avoids abnormal high temperature or high voltage to the injury of power supply, avoid security incident.
Further, described peak absorbing unit is the buffer be made up of resistance R5, resistance R6, electric capacity C4 and diode D5, the positive pole of described diode D5 is connected with No. 6 of crest voltage compensation chips U1, No. 7, No. 8 pins, and the negative pole of described diode D5 is connected with filter unit output by the parallel circuits of resistance R5, resistance R6, electric capacity C4.
Further, the voltage jump limiting unit of a secondary output end of transformer T1 comprises diode D9, resistance R20 and electric capacity C15, the output of described transformer T1 is connected with the positive pole of diode D9, the two ends of described diode D9 are parallel with the series circuit of resistance R20 and electric capacity C15, and the negative pole of described diode D9 is voltage jump limiting unit output.The described voltage jump limiting unit of another secondary output end of transformer T1 comprises diode D8, resistance R25 and electric capacity C14, the output of described transformer T1 is connected with the positive pole of diode D8, the two ends of described diode D8 are parallel with the series circuit of resistance R25 and electric capacity C14, and the negative pole of described diode D8 is voltage jump limiting unit output.
Although the foregoing describe embodiment of the present utility model; but those skilled in the art are to be understood that; these only illustrate; various changes or modifications can be made to present embodiment; and not deviating from principle of the present utility model and essence, protection range of the present utility model is only defined by the appended claims.
Claims (7)
1. a Set Top Box power supply adaptor, it is characterized in that: comprise crest voltage compensation chips U1, ac power input end is connected with filter unit input by rectification unit, described filter unit output is connected with No. 1 pin of crest voltage compensation chips U1, and described filter unit is connected with No. 6, No. 7, No. 8 pins of crest voltage compensation chips U1 respectively by peak absorbing unit; Described peak absorbing unit output is connected with transformer T1 input, described transformer T1 comprises two secondary output ends, each secondary output end is connected with voltage jump limiting unit, is connected with switch switching unit between two secondary output ends of described transformer T1.
2. according to Set Top Box power supply adaptor according to claim 1, it is characterized in that: described switch switching unit comprises metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2, the parallel circuits of resistance R17 and electric capacity C16 is connected with between the source electrode of described metal-oxide-semiconductor Q2 and grid, the drain electrode of the drain electrode output voltage V1 of described metal-oxide-semiconductor Q2, described metal-oxide-semiconductor Q2 is by electric capacity C5 ground connection; The grid of described metal-oxide-semiconductor Q2 is connected with diverter switch SW1 one end by resistance R24, and the other end of described diverter switch SW1 is connected with the drain electrode of metal-oxide-semiconductor Q1 by electric capacity C17, the source output voltage V2 of described metal-oxide-semiconductor Q1; The drain electrode of described metal-oxide-semiconductor Q1 by electric capacity C10 ground connection, the series circuit of described electric capacity C10 two ends parallel diode D10 and electric capacity C9, the intermediate connection point output voltage V3 of described diode D10 and electric capacity C9.
3. according to Set Top Box power supply adaptor according to claim 1, it is characterized in that: described filter unit is the parallel circuits of electric capacity C1 and electric capacity C2.
4. according to Set Top Box power supply adaptor according to claim 1, it is characterized in that: be connected with anti-lightning strike unit between described ac power input end and rectification unit, described anti-lightning strike unit comprises piezo-resistance VZ1 and fusible link F1; Described fusible link F1 one end is connected with ac power input end, and the other end is connected with rectification unit, and described piezo-resistance VZ1 is connected in parallel on rectification unit input.
5. according to Set Top Box power supply adaptor according to claim 1, it is characterized in that: described peak absorbing unit is the buffer be made up of resistance R5, resistance R6, electric capacity C4 and diode D5, the positive pole of described diode D5 is connected with No. 6 of crest voltage compensation chips U1, No. 7, No. 8 pins, and the negative pole of described diode D5 is connected with filter unit output by the parallel circuits of resistance R5, resistance R6, electric capacity C4.
6. according to Set Top Box power supply adaptor according to claim 1, it is characterized in that: described voltage jump limiting unit comprises diode D9, resistance R20 and electric capacity C15, the output of described transformer T1 is connected with the positive pole of diode D9, the two ends of described diode D9 are parallel with the series circuit of resistance R20 and electric capacity C15, and the negative pole of described diode D9 is voltage jump limiting unit output.
7. according to Set Top Box power supply adaptor according to claim 1, it is characterized in that: described voltage jump limiting unit comprises diode D8, resistance R25 and electric capacity C14, the output of described transformer T1 is connected with the positive pole of diode D8, the two ends of described diode D8 are parallel with the series circuit of resistance R25 and electric capacity C14, and the negative pole of described diode D8 is voltage jump limiting unit output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520151968.4U CN204481691U (en) | 2015-03-17 | 2015-03-17 | Set Top Box power supply adaptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520151968.4U CN204481691U (en) | 2015-03-17 | 2015-03-17 | Set Top Box power supply adaptor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204481691U true CN204481691U (en) | 2015-07-15 |
Family
ID=53637463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520151968.4U Expired - Fee Related CN204481691U (en) | 2015-03-17 | 2015-03-17 | Set Top Box power supply adaptor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204481691U (en) |
-
2015
- 2015-03-17 CN CN201520151968.4U patent/CN204481691U/en not_active Expired - Fee Related
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Legal Events
| 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: 20150715 Termination date: 20200317 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |