CN204441875U - A kind of power supply adaptor current foldback circuit for Set Top Box - Google Patents
A kind of power supply adaptor current foldback circuit for Set Top Box Download PDFInfo
- Publication number
- CN204441875U CN204441875U CN201420671781.2U CN201420671781U CN204441875U CN 204441875 U CN204441875 U CN 204441875U CN 201420671781 U CN201420671781 U CN 201420671781U CN 204441875 U CN204441875 U CN 204441875U
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- CN
- China
- Prior art keywords
- circuit
- power supply
- amplifier
- supply adaptor
- resistance
- 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
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Abstract
The utility model provides a kind of power supply adaptor current foldback circuit for Set Top Box; comprise: amplifier circuit, comparator circuit and output circuit; described amplifier circuit carries out amplifier by the current transformer be arranged on power supply adaptor; the output of described amplifier circuit connects described comparator circuit, the control chip of the output connection of described comparator circuit.Electric current is dragged down by shunt circuit by the utility model, thus control output end electric current, prevent the excessive damage causing electronic equipment of output current, improve the reliability of power supply adaptor.
Description
Technical field
The utility model relates to a kind of power supply adaptor, particularly a kind of power supply adaptor current foldback circuit for 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, and the use of various electronic equipment, all be unable to do without power supply adaptor for its charging, power supply adaptor is as modern electronic product equipment, not only its performance will meet power supply unit requirement, autoprotection function also needs to improve, 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, existing Set Top Box power supply adaptor peak load in use easily causes power supply adaptor to damage.Once fault has appearred in electronic product, if the short circuit of electronic product input or output open circuit, otherwise the further damage of electronic product may be caused, even cause the electric shock of operating personnel and fire etc.
Utility model content
The utility model, for the technical problem of above-mentioned existence, proposes a kind of power supply adaptor current foldback circuit for Set Top Box, by arranging current foldback circuit on power supply adaptor, improves the reliability of power supply adaptor.
The technical solution of the utility model is: a kind of power supply adaptor current foldback circuit for Set Top Box; amplifier circuit, comparator circuit and output circuit; described amplifier circuit carries out amplifier by the current transformer be arranged on power supply adaptor; the output of described amplifier circuit connects described comparator circuit, the control chip of the output connection of described comparator circuit.
Further, described amplifier electricity routing resistance R1, resistance R2, resistance R3, electric capacity C1 and amplifier LM1 form, the current signal end that described current transformer detects is connected to the positive pole of amplifier LM1 by resistance R1, resistance R2, resistance R3 and amplifier LM1 form in-phase amplifier output current amplifying signal.
Further, described comparator circuit is made up of comparator LM2, resistance R5, R6, R7 electric capacity C2, C3, C4, the output of described amplifier LM1 is connected to the negative input of comparator LM2 by resistance R5, the electrode input end of comparator connects reference current I0, described reference current I
0be connected with the electrode input end of comparator with electric capacity C2 by resistance R6.
The beneficial effects of the utility model: power supply adaptor is protected by arranging current foldback circuit; when the output end current of power supply adaptor is excessive; by shunt circuit, electric current is dragged down; thus control output end electric current; prevent the excessive damage causing electronic equipment of output current, improve the reliability of power supply adaptor.
Accompanying drawing explanation
Fig. 1 is a kind of power supply adaptor current foldback circuit figure for Set Top Box that the utility model proposes.
Embodiment
See Fig. 1, be a kind of power supply adaptor current foldback circuit figure for Set Top Box that the utility model proposes.
As shown in Figure 1; a kind of power supply adaptor current foldback circuit for Set Top Box; amplifier circuit, comparator circuit and output circuit; described amplifier circuit carries out amplifier by the current transformer be arranged on power supply adaptor; the output of described amplifier circuit connects described comparator circuit, the control chip of the output connection of described comparator circuit.
Further, described amplifier electricity routing resistance R1, resistance R2, resistance R3, electric capacity C1 and amplifier LM1 form, the current signal end that described current transformer detects is connected to the positive pole of amplifier LM1 by resistance R1, resistance R2, resistance R3 and amplifier LM1 form in-phase amplifier output current amplifying signal.
Further, described comparator circuit is made up of comparator LM2, resistance R5, R6, R7 electric capacity C2, C3, C4, and the output of described amplifier LM1 is connected to the negative input of comparator LM2 by resistance R5, and the electrode input end of comparator connects reference current I
0, described reference current I
0be connected with the electrode input end of comparator with electric capacity C2 by resistance R6.
When the electric current detected is lower than reference current; comparator LM2 output low level; for the power supply adaptor normal power supply of Set Top Box; when the electric current detected reaches the reference current of setting; comparator LM2 exports high level; being connected shunt circuit conducting with comparator LM2 output, realizing the protection to crossing current circuit.
The beneficial effects of the utility model: power supply adaptor is protected by arranging current foldback circuit; when the output end current of power supply adaptor is excessive; by shunt circuit, electric current is dragged down; thus control output end electric current; prevent the excessive damage causing electronic equipment of output current, improve the reliability of power supply adaptor.
Above the utility model is described in detail, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from the utility model aim.Do not depart from design of the present utility model and scope can make many other and change and remodeling.Should be appreciated that the utility model is not limited to specific execution mode, scope of the present utility model is defined by the following claims.
Claims (3)
1. the power supply adaptor current foldback circuit for Set Top Box; it is characterized in that; comprise: amplifier circuit, comparator circuit and output circuit; described amplifier circuit carries out amplifier by the current transformer be arranged on power supply adaptor; the output of described amplifier circuit connects described comparator circuit, the control chip of the output connection of described comparator circuit.
2. a kind of power supply adaptor current foldback circuit for Set Top Box according to claim 1; it is characterized in that; described amplifier electricity routing resistance R1, resistance R2, resistance R3, electric capacity C1 and amplifier LM1 form; the current signal end that described current transformer detects is connected to the positive pole of amplifier LM1 by resistance R1, resistance R2, resistance R3 and amplifier LM1 form in-phase amplifier output current amplifying signal.
3. a kind of power supply adaptor current foldback circuit for Set Top Box according to claim 1; it is characterized in that; described comparator circuit is made up of comparator LM2, resistance R5, R6, R7 electric capacity C2, C3, C4; the output of described amplifier LM1 is connected to the negative input of comparator LM2 by resistance R5; the electrode input end of comparator connects reference current I0, described reference current I
0be connected with the electrode input end of comparator with electric capacity C2 by resistance R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671781.2U CN204441875U (en) | 2014-11-12 | 2014-11-12 | A kind of power supply adaptor current foldback circuit for Set Top Box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671781.2U CN204441875U (en) | 2014-11-12 | 2014-11-12 | A kind of power supply adaptor current foldback circuit for Set Top Box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204441875U true CN204441875U (en) | 2015-07-01 |
Family
ID=53609695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420671781.2U Expired - Fee Related CN204441875U (en) | 2014-11-12 | 2014-11-12 | A kind of power supply adaptor current foldback circuit for Set Top Box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204441875U (en) |
-
2014
- 2014-11-12 CN CN201420671781.2U patent/CN204441875U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20171112 |