CN106028149B - A kind of set-top box power-off discharge circuit and charging method - Google Patents
A kind of set-top box power-off discharge circuit and charging method Download PDFInfo
- Publication number
- CN106028149B CN106028149B CN201610451610.2A CN201610451610A CN106028149B CN 106028149 B CN106028149 B CN 106028149B CN 201610451610 A CN201610451610 A CN 201610451610A CN 106028149 B CN106028149 B CN 106028149B
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- China
- Prior art keywords
- top box
- transistor
- voltage
- discharge cell
- detection unit
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
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- Engineering & Computer Science (AREA)
- Software Systems (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention relates to a kind of set-top box power-off discharge circuit and methods; the working condition for monitoring set-top box determines whether set-top box is off-position; negative voltage is formed in discharge cell when set-top box is off-position; increase the voltage difference between discharge cell and capacitive load or power bus, so that charge be made more quickly to shift, accelerates the velocity of discharge; realize repid discharge; it avoids set-top box starting abnormal or failure, set-top box is worked normally, guarantees the performance of set-top box.
Description
Technical field
The present invention relates to digital television devices more particularly to a kind of set-top box power-off discharge circuits and charging method.
Background technique
Set-top box is common digital television devices, is widely used in each family.
Set-top box will use the capacitive loads such as capacitor in circuit, capacitive is negative as a kind of high-end intelligent electronic equipment
When being loaded in shutdown power-off, charge will not disappear at once, cause the voltage on circuit that can't rapidly disappear, but slowly decline,
Electric discharge cannot be rapidly completed.When set-top box is switched on again, if electric discharge is not completed, the residual voltage of circuit is still larger,
The voltage electric sequence that circuit will so be will affect causes set-top box starting abnormal or failure, prevent set-top box is from normal
Work, seriously affects the performance of set-top box.
Summary of the invention
In view of this, it is necessary to electric discharge cannot be rapidly completed when shutting down and power off for above-mentioned set-top box, cause to restart exception
Or the problem of failure, a kind of set-top box power-off discharge circuit and charging method are provided.
A kind of set-top box provided by the invention powers off discharge circuit, including energy-storage units, outage detection unit, negative pressure unit
And discharge cell；The energy-storage units are connect with power bus and outage detection unit, when set-top box works and is powered by supplying
Electric energy is obtained in electric bus and is stored, and provides electric energy for outage detection list for the outage detection unit in set-top box power-off
Member work, the outage detection unit are connect with energy-storage units, power bus and negative pressure unit, and the voltage for detecting power bus comes
Judge whether set-top box is off-position, and the negative pressure unit controlled according to judging result, the negative pressure unit with
Power bus, outage detection unit and discharge cell connection, receive the outage detection unit when set-top box is off-position
Control, form negative voltage at discharge cell, increase the voltage difference between discharge cell and capacitive load or power bus.
In one of them embodiment, the outage detection unit detects power bus voltage, sets if voltage is higher than
Determine threshold value, then judges that set-top box is in normal power supply state, output high-level control signal to the negative pressure unit；If detecting
Voltage is lower than given threshold, then determines that set-top box is in off-position, output low level control signal to the negative pressure unit.
In one of them embodiment, when the negative pressure unit receives high-level control signal, by power bus
It obtains electric energy and stores；Negative voltage is formed at discharge cell using the electric energy of storage when receiving low level control signal.
In one of them embodiment, the negative pressure unit includes first resistor, second resistance, storage capacitor,
One transistor, second transistor and third transistor；Described first resistor one end connects outage detection unit, other end connection the
The base stage of one transistor and the base stage of second transistor, the first transistor are NPN transistor, and collector connection power supply is total
Line, emitter connects the emitter of second transistor and storage capacitor one end, second transistor are PNP transistor, and collector connects
Ground, third transistor are NPN transistor, and collector connects discharge cell and the storage capacitor other end, emitter ground connection, and base stage connects
Second resistance one end is connect, the second resistance other end connects outage detection unit.
In one of them embodiment, the discharge cell ends in set-top box normal power supply state, on machine top
Box is connected when being in off-position.
In one of them embodiment, the discharge cell includes the 4th transistor and 3rd resistor；Described 4th
Transistor is PNP transistor, and collector connects the collector and the storage capacitor other end of third transistor, emitter connection power supply
Bus, base stage connect described 3rd resistor one end, and the 3rd resistor other end receives the outage detection unit control.
A kind of set-top box provided by the invention powers off charging method, includes the following steps:
S10: whether monitoring set-top box is off-position；
S20: if set-top box is in off-position, negative voltage is formed at discharge cell, increases discharge cell and capacitive
Voltage difference between load or power bus.
In one of them embodiment, the step S10 specifically: by the voltage for detecting set-top box power bus
To monitor whether set-top box is off-position.
In one of them embodiment, the step S10 specifically: detection power bus VCC voltage, if voltage is high
In given threshold, then judges that set-top box is in normal power supply state, export high-level control signal；If detecting that voltage is lower than to set
Determine threshold value, then determines that set-top box is in off-position, export low level control signal.
Set-top box power-off discharge circuit of the present invention and method, the working condition for monitoring set-top box determine whether set-top box is disconnected
Electricity condition forms negative voltage in discharge cell when set-top box is off-position, increases discharge cell and capacitive load or power supply
Voltage difference between bus accelerates the velocity of discharge so that charge be made more quickly to shift, and realizes repid discharge, avoids machine top
Box starting is abnormal or fails, and set-top box is worked normally, guarantees the performance of set-top box.
Detailed description of the invention
Fig. 1 is the structure chart of the set-top box power-off discharge circuit in one embodiment；
Fig. 2 is the concrete structure diagram of the set-top box power-off discharge circuit in one embodiment；
Fig. 3 is the flow chart of the set-top box power-off charging method in one embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Set-top box is after shutdown power-off, meeting between the capacitive load in circuit and set-top box power bus or discharge cell
It there are a barrier, is considered as a barrier resistance, barrier resistance can hinder the transfer of electronics, influence letting out for residual voltage
Putting speed makes the velocity of discharge slack-off.
Under bigger pressure difference electric field action, the transfer velocity of electronics can be greatly improved, and can be improved the velocity of discharge, this hair
It is bright to provide a kind of set-top box power-off discharge circuit around this principle, it generates a negative supply and provides one after shut down and bear
Voltage field is superimposed on former discharge cell, is formed in this way between discharge cell and capacitive load (or power bus) one bigger
Voltage difference and electric field, shift charge more quickly, to realize repid discharge.
Specifically, Fig. 1 is the structure chart of the set-top box power-off discharge circuit in one embodiment, Fig. 2 is one embodiment
In set-top box power-off discharge circuit concrete structure diagram, combined with Figure 1 and Figure 2, the set-top box power-off discharge circuit include: energy storage
Unit 100, outage detection unit 200, negative pressure unit 300 and discharge cell 400.Energy-storage units 100 and power bus VCC and
Outage detection unit 200 connects, when set-top box works and is powered by obtaining electric energy on power bus VCC and storing, and on machine top
Electric energy is provided when box powers off for outage detection unit 200 to work for outage detection unit 200.Outage detection unit 200 and energy storage
Unit 100, power bus VCC and negative pressure unit 300 connect, detect the voltage of power bus VCC judge set-top box whether be
Off-position, and negative pressure unit 300 is controlled according to judging result.Negative pressure unit 300 and power bus VCC, power-off are examined
It surveys unit 200 and discharge cell 400 connects, receive the control of outage detection unit 200 when set-top box is off-position, putting
Negative voltage is formed at electric unit 400, increases the voltage difference between discharge cell 400 and capacitive load or power bus VCC, is accelerated
The velocity of discharge of discharge cell 400.
Further, outage detection unit 200 detects power bus VCC voltage, if voltage is higher than given threshold, judges
Set-top box is in normal power supply state, output high-level control signal to negative pressure unit 300；If detecting voltage lower than setting threshold
Value then determines that set-top box is in off-position, output low level control signal to negative pressure unit 300.
When negative pressure unit 300 receives high-level control signal, electric energy is obtained by power bus VCC and is stored；It receives
Form negative voltage when low level control signal at discharge cell 400 using the electric energy of storage.
Further, negative pressure unit 300 includes first resistor R1, second resistance R2, storage capacitor C1, the first transistor
Q1, second transistor Q2 and third transistor Q3.The one end first resistor R1 connects outage detection unit 200, other end connection the
The base stage B of the base stage B and second transistor Q2 of one transistor Q1.The first transistor Q1 is NPN transistor, and collector C connection supplies
Electric bus VCC, emitter E connect emitter E and one end storage capacitor C1 of second transistor Q2.Second transistor Q2 is PNP
Transistor, collector C ground connection.Third transistor Q3 is NPN transistor, collector C connection discharge cell 400 and storage capacitor C1
The other end, emitter E ground connection, the one end base stage B connection second resistance R2.The second resistance R2 other end connects outage detection unit
200。
Discharge cell 400 ends in set-top box normal power supply state, is connected when set-top box is in off-position.Electric discharge
Unit 400 includes the 4th transistor Q4 and 3rd resistor R3.4th transistor Q4 is PNP transistor, and collector C connection third is brilliant
The collector C and the storage capacitor C1 other end of body pipe Q3, emitter E connect power bus VCC, base stage B connection 3rd resistor R3
One end, the 3rd resistor R3 other end receive the control of outage detection unit 200.
The set-top box powers off discharge circuit, is in normal power supply state in set-top box, outage detection unit 200 exports high electricity
When flat control signal, second transistor Q2 ends, the first transistor Q1 and third transistor Q3 saturation conduction, power bus VCC
For storage capacitor C1 charging.When set-top box is in off-position, and outage detection unit 200 exports low level control signal, the
One transistor Q1 and third transistor Q3 cut-off, second transistor Q2 conducting, storage capacitor C1 positively charged one end ground connection, storage
Negative voltage is relative to ground presented in the energy electronegative other end of capacitor C1, to form negative voltage at discharge cell 400, accelerates to put
Electric discharge of the electric unit 400 to capacitive load or power bus VCC, is rapidly completed electric discharge.
This kind of set-top box powers off discharge circuit, and the working condition for monitoring set-top box determines whether set-top box is off-position,
Negative voltage is formed in discharge cell when set-top box is off-position, is increased between discharge cell and capacitive load or power bus
Voltage difference accelerate the velocity of discharge so that charge be made more quickly to shift, realize repid discharge, avoid set-top box starting different
Often or fail, set-top box is worked normally, guarantees the performance of set-top box.
Meanwhile the present invention also provides a kind of set-top boxes to power off charging method, as shown in figure 3, this method comprises the following steps:
S10: whether monitoring set-top box is off-position.
In the step, monitor whether set-top box is off-position by detecting the voltage of set-top box power bus.More into
One step, power bus VCC voltage is detected, if voltage is higher than given threshold, judges that set-top box is in normal power supply state, it is defeated
High-level control signal out；If detecting, voltage lower than given threshold, determines that set-top box is in off-position, exports low level
Control signal.
S20: if set-top box is in off-position, negative voltage is formed at discharge cell, increases discharge cell and capacitive
Voltage difference between load or power bus.
When set-top box is in off-position, negative voltage is formed at discharge cell, negative voltage is capable of increasing discharge cell
Voltage difference between capacitive load or power bus accelerates electric discharge, so that electric discharge be rapidly completed.
This kind of set-top box powers off charging method, and the working condition for monitoring set-top box determines whether set-top box is off-position,
Negative voltage is formed in discharge cell when set-top box is off-position, is increased between discharge cell and capacitive load or power bus
Voltage difference accelerate the velocity of discharge so that charge be made more quickly to shift, realize repid discharge, avoid set-top box starting different
Often or fail, set-top box is worked normally, guarantees the performance of set-top box.
Set-top box power-off discharge circuit of the present invention and method, the working condition for monitoring set-top box determine whether set-top box is disconnected
Electricity condition forms negative voltage in discharge cell when set-top box is off-position, increases discharge cell and capacitive load or power supply
Voltage difference between bus accelerates the velocity of discharge so that charge be made more quickly to shift, and realizes repid discharge, avoids machine top
Box starting is abnormal or fails, and set-top box is worked normally, guarantees the performance of set-top box.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (7)
1. a kind of set-top box powers off discharge circuit, which is characterized in that including energy-storage units, outage detection unit, negative pressure unit with
And discharge cell；The energy-storage units are connect with power bus and outage detection unit, when set-top box works and is powered by powering
Electric energy is obtained in bus and is stored, and provides electric energy for outage detection unit for the outage detection unit in set-top box power-off
Work, the outage detection unit are connect with energy-storage units, power bus and negative pressure unit, detect the voltage of power bus to sentence
Whether off line top box is off-position, and is controlled according to judging result the negative pressure unit, the negative pressure unit and confession
Electric bus, outage detection unit and discharge cell connection, receive the outage detection unit when set-top box is off-position
Control forms negative voltage at discharge cell, increases the voltage difference between discharge cell and storage capacitor or power bus；
The negative pressure unit includes that first resistor, second resistance, storage capacitor, the first transistor, second transistor and third are brilliant
Body pipe；Described first resistor one end connects outage detection unit, and the other end connects the base stage and second transistor of the first transistor
Base stage, the first transistor be NPN transistor, collector connect power bus, emitter connect second transistor hair
Emitter-base bandgap grading and storage capacitor one end, second transistor are PNP transistor, and grounded collector, third transistor is NPN transistor, collection
Electrode connects discharge cell and the storage capacitor other end, emitter ground connection, and base stage connects second resistance one end, and second resistance is another
End connection outage detection unit；
When the negative pressure unit receives high-level control signal, electric energy is obtained by power bus and is stored；Receive low level
Negative voltage is formed at discharge cell using the electric energy of storage when controlling signal.
2. set-top box according to claim 1 powers off discharge circuit, which is characterized in that the outage detection unit detection supplies
Electric bus voltage judges that set-top box is in normal power supply state, exports high-level control signal if voltage is higher than given threshold
To the negative pressure unit；If detecting, voltage lower than given threshold, determines that set-top box is in off-position, exports low level control
Signal processed is to the negative pressure unit.
3. set-top box according to claim 1 powers off discharge circuit, which is characterized in that the discharge cell set-top box just
End when normal power supply state, is connected when set-top box is in off-position.
4. set-top box according to claim 3 powers off discharge circuit, which is characterized in that the discharge cell includes the 4th brilliant
Body pipe and 3rd resistor；4th transistor is PNP transistor, and collector connects the collector and energy storage electricity of third transistor
Hold the other end, emitter connects power bus, and base stage connects described 3rd resistor one end, and the 3rd resistor other end receives described disconnected
The control of electro-detection unit.
5. a kind of set-top box powers off charging method, which comprises the steps of:
S10: whether monitoring set-top box is off-position；
S20: if set-top box is in off-position, negative voltage is formed at discharge cell, increases discharge cell and storage capacitor
Or the voltage difference between power bus；When negative pressure unit receives high-level control signal, electric energy is obtained by power bus and is deposited
Storage；Negative voltage is formed at discharge cell using the electric energy of storage when receiving low level control signal；
The negative pressure unit includes that first resistor, second resistance, storage capacitor, the first transistor, second transistor and third are brilliant
Body pipe；Described first resistor one end connects outage detection unit, and the other end connects the base stage and second transistor of the first transistor
Base stage, the first transistor be NPN transistor, collector connect power bus, emitter connect second transistor hair
Emitter-base bandgap grading and storage capacitor one end, second transistor are PNP transistor, and grounded collector, third transistor is NPN transistor, collection
Electrode connects discharge cell and the storage capacitor other end, emitter ground connection, and base stage connects second resistance one end, and second resistance is another
End connection outage detection unit.
6. set-top box according to claim 5 powers off charging method, which is characterized in that the step S10 specifically: pass through
The voltage of set-top box power bus is detected to monitor whether set-top box is off-position.
7. set-top box according to claim 6 powers off charging method, which is characterized in that the step S10 specifically: detection
Power bus VCC voltage judges that set-top box is in normal power supply state, exports high level control if voltage is higher than given threshold
Signal processed；If detecting, voltage lower than given threshold, determines that set-top box is in off-position, exports low level control signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610451610.2A CN106028149B (en) | 2016-06-21 | 2016-06-21 | A kind of set-top box power-off discharge circuit and charging method |
| PCT/CN2017/080425 WO2017219737A1 (en) | 2016-06-21 | 2017-04-13 | Discharge circuit and discharge method for set-top box during poweroff |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610451610.2A CN106028149B (en) | 2016-06-21 | 2016-06-21 | A kind of set-top box power-off discharge circuit and charging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106028149A CN106028149A (en) | 2016-10-12 |
| CN106028149B true CN106028149B (en) | 2019-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610451610.2A Expired - Fee Related CN106028149B (en) | 2016-06-21 | 2016-06-21 | A kind of set-top box power-off discharge circuit and charging method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106028149B (en) |
| WO (1) | WO2017219737A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028149B (en) * | 2016-06-21 | 2019-07-09 | 深圳市九洲电器有限公司 | A kind of set-top box power-off discharge circuit and charging method |
| CN111670527B (en) * | 2019-01-09 | 2024-06-11 | 深圳市大疆创新科技有限公司 | Discharge circuit for distance measuring device, distributed radar system and movable platform |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930219A (en) * | 2009-06-22 | 2010-12-29 | 研祥智能科技股份有限公司 | Discharge control circuit and computer |
| CN102594111A (en) * | 2012-02-24 | 2012-07-18 | 中兴通讯股份有限公司 | Quick discharge circuit |
| US8339056B1 (en) * | 2010-06-17 | 2012-12-25 | Universal Lighting Technologies, Inc. | Lamp ballast with protection circuit for input arcing and line interruption |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7936189B2 (en) * | 2008-12-04 | 2011-05-03 | Stmicroelectronics S.R.L. | Driver circuit and method for reducing electromagnetic interference |
| US8248880B2 (en) * | 2010-03-29 | 2012-08-21 | Micron Technology, Inc. | Voltage regulators, amplifiers, memory devices and methods |
| CN202602274U (en) * | 2012-05-08 | 2012-12-12 | 北京益弘泰科技发展有限责任公司 | Load discharge circuit suitable for power supply system |
| CN104122968A (en) * | 2013-04-24 | 2014-10-29 | 昆达电脑科技(昆山)有限公司 | Quick discharging device |
| CN104518486A (en) * | 2013-09-30 | 2015-04-15 | 上海贝尔股份有限公司 | Discharge circuit for quickly discharging capacitor after powering off |
| CN106028149B (en) * | 2016-06-21 | 2019-07-09 | 深圳市九洲电器有限公司 | A kind of set-top box power-off discharge circuit and charging method |
-
2016
- 2016-06-21 CN CN201610451610.2A patent/CN106028149B/en not_active Expired - Fee Related
-
2017
- 2017-04-13 WO PCT/CN2017/080425 patent/WO2017219737A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930219A (en) * | 2009-06-22 | 2010-12-29 | 研祥智能科技股份有限公司 | Discharge control circuit and computer |
| US8339056B1 (en) * | 2010-06-17 | 2012-12-25 | Universal Lighting Technologies, Inc. | Lamp ballast with protection circuit for input arcing and line interruption |
| CN102594111A (en) * | 2012-02-24 | 2012-07-18 | 中兴通讯股份有限公司 | Quick discharge circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106028149A (en) | 2016-10-12 |
| WO2017219737A1 (en) | 2017-12-28 |
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Granted publication date: 20190709 Termination date: 20200621 |