CN205595844U - Capacitor discharge circuit, communication interface power supply loop and electronic equipment - Google Patents
Capacitor discharge circuit, communication interface power supply loop and electronic equipment Download PDFInfo
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- CN205595844U CN205595844U CN201620327264.2U CN201620327264U CN205595844U CN 205595844 U CN205595844 U CN 205595844U CN 201620327264 U CN201620327264 U CN 201620327264U CN 205595844 U CN205595844 U CN 205595844U
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- 239000003990 capacitor Substances 0.000 title claims abstract description 58
- 238000004891 communication Methods 0.000 title claims abstract description 44
- 238000007599 discharging Methods 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a capacitor discharge circuit, communication interface power supply loop and electronic equipment, the capacitor discharge circuit is arranged in communication interface's power supply loop, discharges to connecting in the filter capacitance of power supply loop output, and including voltage testing, the module of discharging and control module, voltage testing is connected with control module respectively with the module of discharging, wherein, voltage testing for detect power supply loop's output voltage, control module for corresponding control signal to the module of discharging is exported to output voltage size according to voltage testing detects, the module of discharging for put electric treatment according to control signal to filter capacitance. The utility model discloses technical scheme enables electronic equipment and goes up again when electricity, and communication interface can accurate read normal communication signal.
Description
Technical field
This utility model relates to technical field of electronic equipment, particularly to a kind of capacitor discharging circuit, communication
Interface current supply circuit and electronic equipment.
Background technology
In the electronic equipments such as existing television set, computer, on the one hand the current supply circuit of its communication interface needs
Power supply provides supply voltage, provides supply voltage to communication interface the most again.Have when voltage is provided
Filtering requirements, needs with bigger filter capacitor providing supply voltage to be filtered processing, and needs electricity
Resistance requirements is had, it is impossible to arbitrarily increase discharge resistance and filter capacitor is discharged during pressure.So, logical
When believing the current supply circuit power-off of interface, current supply circuit can be in high-impedance state, and the electricity on filter capacitor is long
Time can not get release.When re-powering, communication interface can be done because of the high voltage signal on filter capacitor
Disturb and cannot accurately read normal signal of communication.
Utility model content
Main purpose of the present utility model is to provide a kind of capacitor discharging circuit, makes electronic equipment re-power
Time, communication interface can accurately read normal signal of communication.
For achieving the above object, the capacitor discharging circuit that the utility model proposes include voltage detection module,
Discharge module and control module, described voltage detection module and discharge module are respectively with described control module even
Connect；Wherein, described voltage detection module, for detecting the output voltage of described current supply circuit；Described control
Molding block, for the corresponding control of output voltage size output detected according to described voltage detection module
Signal is to described discharge module；Described discharge module, is used for according to described control signal described filtered electrical
Hold and carry out discharge process.
Preferably, described voltage detection module includes the first resistance, the second resistance, the 3rd resistance and first
Switching tube；The input of described first switching tube is connected with the first end of described first resistance, and described first
Switching tube and the test side that link node is described voltage detection module of described first resistance；Described first
First end interconnection of the controlled end of switching tube, the second end of described first resistance and described second resistance；Institute
First end of the outfan and described 3rd resistance of stating the first switching tube is connected, described first switching tube and institute
State the outfan that link node is described voltage detection module of the first resistance；The second of described second resistance
End and the second end ground connection of described 3rd resistance.
Preferably, described control module includes the 4th resistance, the 5th resistance and second switch pipe；Described
The input of two switching tubes is used for input supply voltage, and the controlled end of described second switch pipe is described control
The input of module, the outfan of described second switch pipe is connected with the first end of described 4th resistance, institute
First end of the second end and described 5th resistance of stating the 4th resistance is connected, described 4th resistance and described the
The link node of five resistance is the control end of described control module, the second end ground connection of described 5th resistance.
Preferably, described discharge module includes the 6th resistance and the 3rd switching tube；Described 3rd switching tube
Input is connected with the second end of described 6th resistance, and the first end of described 6th resistance is described electric discharge mould
The energy absorption end of block；The controlled end that controlled end is described discharge module of described 3rd switching tube, described
The output head grounding of the 3rd switching tube.
This utility model also proposes a kind of communication interface current supply circuit, including electric capacity as above electric discharge electricity
Road；Wherein, described capacitor discharging circuit includes voltage detection module, discharge module and control module, institute
State voltage detection module and discharge module is connected with described control module respectively；Described voltage detection module,
For detecting the output voltage of described current supply circuit；Described control module, for according to described voltage detecting
The output voltage size output that module detects controls signal to described discharge module accordingly；Described electric discharge
Module, for carrying out discharge process according to described control signal to described filter capacitor.
This utility model also proposes a kind of electronic equipment, and this electronic equipment includes communicating output interface and as above
Described communication interface current supply circuit, described communication interface current supply circuit is connected with described communication output interface；
Wherein, described communication interface current supply circuit is identical, the most not with above-mentioned communication interface current supply circuit structure
Repeat again.
Preferably, described communication output interface is MHL interface.
Preferably, described communication output interface is HDMI.
The power supply that technical solutions of the utility model detect according to voltage detection module by using control module
The output voltage output in loop controls signal to discharge module, accordingly so that discharge module is to filter capacitor
Carry out discharge process.Making when electronic equipment re-powers, communication interface can accurately be read normally
Signal of communication.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that,
Accompanying drawing in describing below is only embodiments more of the present utility model, for ordinary skill people
From the point of view of Yuan, on the premise of not paying creative work, it is also possible to obtain according to the structure shown in these accompanying drawings
Obtain other accompanying drawing.
Fig. 1 is the high-level schematic functional block diagram of this utility model capacitor discharging circuit one embodiment；
Fig. 2 is the electrical block diagram of this utility model another embodiment of capacitor discharging circuit.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 10 | Voltage detection module | R1 | First resistance |
| 20 | Control module | R2 | Second resistance |
| 30 | Discharge module | R3 | 3rd resistance |
| 100 | Communication interface | R4 | 4th resistance |
| Q1 | First switching tube | R5 | 5th resistance |
| Q2 | Second switch pipe | R6 | 6th resistance |
| Q3 | 3rd switching tube |
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings into
One step explanation.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to the technology in this utility model embodiment
Scheme is clearly and completely described, it is clear that described embodiment is only of the present utility model one
Section Example rather than whole embodiments.Based on the embodiment in this utility model, this area is general
The every other embodiment that logical technical staff is obtained under not making creative work premise, broadly falls into
The scope of this utility model protection.
In this utility model, relate to the description of " first ", " second " etc. be only used for describing purpose, and not
It is understood that as instruction or implies its relative importance or the implicit quantity indicating indicated technical characteristic.
Thus, define " first ", the feature of " second " can express or implicitly include at least one should
Feature.It addition, the technical scheme between each embodiment can be combined with each other, but must be with ability
Based on territory those of ordinary skill is capable of, when the combination of technical scheme occurs conflicting or cannot be real
Will be understood that the combination of this technical scheme does not exists now, the protection model not required at this utility model
Within enclosing.
The utility model proposes a kind of capacitor discharging circuit.
Referring to figs. 1 through 2, Fig. 1 is the functional module signal of this utility model capacitor discharging circuit one embodiment
Figure；Fig. 2 is the electrical block diagram of this utility model another embodiment of capacitor discharging circuit.
As it is shown in figure 1, in this utility model embodiment, this capacitor discharging circuit includes voltage detecting mould
Block 10, discharge module 30 and control module 20, described voltage detection module 10 and discharge module 30 points
It is not connected with described control module 20；Wherein, described voltage detection module 10, it is used for detecting described power supply
The output voltage in loop (current supply circuit as shown in Figure 1)；Described control module 20, for according to institute
State the output voltage size output that voltage detection module 10 detects and control signal to described electric discharge mould accordingly
Block 30；Described discharge module 30, for according to described control signal to described filter capacitor (such as Fig. 1 institute
The filter capacitor shown) carry out discharge process.
The test side M of voltage detection module in capacitor discharging circuit 10 is connected the outfan of current supply circuit,
The energy absorption end N of discharge module in capacitor discharging circuit 30 is connected the outfan of filter capacitor.Work as electricity
When pressure detection module 10 detects current supply circuit output high level, control module 20 output makes discharge module
30 control signals do not discharged, filter capacitor charging output supply voltage.When voltage detection module 10 is examined
When measuring current supply circuit output low level, control module 20 output makes the control letter that discharge module 30 discharges
Number, the electric energy that filter capacitor stores is discharged module 30 and consumes.
Easy to understand, after arranging capacitor discharging circuit between current supply circuit and filter capacitor, if powering back
Road output high level, then filter capacitor output supply voltage, it is normal that late-class circuit can obtain working power
Work；If current supply circuit output low level, then non-transformer is defeated because the electric energy of storage is consumed for filter capacitor
Go out.Therefore, the capacitor discharging circuit that the utility model proposes can be under conditions of not interference power exports
Filter capacitor is discharged.
It should be noted that filter capacitor can be entered by the capacitor discharging circuit owing to the utility model proposes
Row low pressure discharge, it is also possible to filter capacitor is carried out low pressure discharge, therefore, the electricity that the utility model proposes
Discharge capacitor circuit can be widely applied in the Circuits System needing to discharge filter capacitor.Such as,
For needing the electronic equipment of high voltage supply, after electronic equipment power-off, filter capacitor is not owing to discharging back
Road and store high pressure.When electronic equipment is again turned on or people overhaul electronic equipment, exist
Electric shock hidden danger, and use the capacitor discharging circuit that the utility model proposes that this filter capacitor is discharged,
Can effectively eliminate the electric shock caused because of filter capacitor energy storage.
Technical solutions of the utility model detect according to voltage detection module 10 by using control module 20
The output voltage output of current supply circuit control signal to discharge module 30 accordingly, so that discharge module 30
Filter capacitor is carried out discharge process.Making when electronic equipment re-powers, communication interface 100 can
Accurately read normal signal of communication.
Preferably, described voltage detection module 10 includes the first resistance R1, the second resistance R2, the 3rd electricity
Resistance R3 and the first switching tube Q1；The input of described first switching tube Q1 is with described first resistance R1's
First end connects, and the input of described first switching tube Q1 with the link node of described first resistance R1 is
The test side M of described voltage detection module 10；The controlled end of described first switching tube Q1, described first
Second end of resistance R1 and the first end interconnection of described second resistance R2；Described first switching tube Q1's
Outfan is connected with first end of described 3rd resistance R3, described first switching tube Q1 and described 3rd electricity
The outfan that link node is described voltage detection module 10 of resistance R3；The second of described second resistance R2
End and the second end ground connection GND of described 3rd resistance R3.It should be noted that described first switching tube
Q1 can be audion, it is also possible to is metal-oxide-semiconductor, does not limits.In the present embodiment, described
One switching tube Q1 is PNP type triode；The base stage of this audion is the controlled of described first switching tube Q1
End, the outfan of the most described first switching tube Q1 of current collection of this audion, the transmitting of this audion is extremely
The input of described first switching tube Q1.
When the test side M of voltage detecting circuit 10 detects high level signal, the first resistance R1 and
Two resistance R2 constitute bleeder circuit.By arranging the first resistance R1 and the parameter of the second resistance R2, make
The voltage that first resistance R1 the divides cut-in voltage higher than the first switching tube Q1.At the first switching tube Q1
After unlatching, the outfan output high level signal of voltage detecting circuit 10.
When the test side M of voltage detecting circuit 10 detects low level signal, the first switching tube Q1 cuts
Only, the collector voltage of the first switching tube Q1 is pulled low, and the outfan output of voltage detecting circuit 10 is low
Level signal.
Preferably, described control module 20 includes the 4th resistance R4, the 5th resistance R5 and second switch pipe
Q2；The input of described second switch pipe Q2 is used for input supply voltage, described second switch pipe Q2's
Controlled end is the input of described control module 20, the outfan of described second switch pipe Q2 and described the
First end of four resistance R4 connects, and second end of described 4th resistance R4 is with described 5th resistance R5's
First end connects, and the link node of described 4th resistance R4 and described 5th resistance R5 is described control mould
The control end of block 20, the second end ground connection GND of described 5th resistance R5.It should be noted that it is described
Second switch pipe Q2 can be audion, it is also possible to is metal-oxide-semiconductor, does not limits.The present embodiment
In, described second switch pipe Q2 is PNP type triode；The base stage of this audion is described second switch
The controlled end of pipe Q2, the outfan of the current collection the most described second switch pipe Q2 of this audion, this three pole
The input of the transmitting the most described second switch pipe Q2 of pipe.
When the input input high level signal of control module 20, second switch pipe Q2 ends, and second
The output end voltage of switching tube Q2 is pulled low, the control end output low level signal of control module 20.When
During the input input low level signal of control module 20, second switch pipe Q2 turns on, control module 20
Control end output high level signal.
Preferably, described discharge module 30 includes the 6th resistance R6 and the 3rd switching tube Q3；Described 3rd
The input of switching tube Q3 is connected with second end of described 6th resistance R6, described 6th resistance R6's
First end is the energy absorption end N of described discharge module 30；The controlled end of described 3rd switching tube Q3 is
The controlled end of described discharge module 30, the output head grounding GND of described 3rd switching tube Q3.Need
Bright, described 3rd switching tube Q3 can be audion, it is also possible to is metal-oxide-semiconductor, does not limits
System.In the present embodiment, described 3rd switching tube Q3 is NPN type triode；The base stage of this audion is
The controlled end of described 3rd switching tube Q3, the most described 3rd switching tube Q3's of current collection of this audion is defeated
Enter end, the outfan of the most described 3rd switching tube Q3 of transmitting of this audion.
When the controlled end input low level signal of discharge module 30, the 3rd switching tube Q3 cut-off, electric discharge
Module 30 does not works.When the controlled end input high level signal of discharge module 30, the 3rd switching tube Q3
Conducting, the electric energy of the energy absorption end N input of discharge module 30 is discharged by the 3rd switching tube Q3.Its
In, the 6th resistance R6 is for limiting the size of discharge current.
Hereinafter, in conjunction with Fig. 1 and Fig. 2, the operation principle of this utility model capacitor discharging circuit is described:
When electric power starting, it is carried in voltage the opening higher than the first switching tube Q1 at the first resistance R1 two ends
Opening voltage, the first switching tube Q1 opens, and the outfan output high level signal of voltage detection module 10 is extremely
The input of control module 20.Second switch pipe Q2 ends, the output end voltage of second switch pipe Q2
Being pulled low, the control end output low level signal of control module 20 is to discharge module 30.3rd switching tube
Q3 ends, and discharge module 30 does not works, filter capacitor charging output supply voltage.
When power remove, the first switching tube Q1 cut-off, the outfan output of voltage detection module 10 is low
Level signal is to the input of control module 20.Second switch pipe Q2 turns on, the control of control module 20
End output high level signal is to discharge module 30.3rd switching tube Q3 conducting, the energy of discharge module 30
Absorption edge is absorbed the voltage of filter capacitor storage and is discharged by the 3rd switching tube Q3.
This utility model also proposes a kind of communication interface current supply circuit, this communication interface current supply circuit include as
Upper described capacitor discharging circuit, concrete structure reference above-described embodiment of this capacitor discharging circuit, due to
This communication interface current supply circuit have employed whole technical schemes of above-mentioned all embodiments, the most at least has
All beneficial effects that the technical scheme of above-described embodiment is brought, this is no longer going to repeat them.Wherein,
Capacitor discharging circuit includes voltage detection module 10, discharge module 30 and control module 20, described voltage
Detection module 10 and discharge module 30 are connected with described control module 20 respectively；Wherein, described voltage inspection
Survey module 10, be used for detecting the output voltage of described current supply circuit (current supply circuit as shown in Figure 1)；
Described control module 20, for the output voltage size output detected according to described voltage detection module 10
Control signal to described discharge module 30 accordingly；Described discharge module 30, for controlling letter according to described
Number described filter capacitor (filter capacitor as shown in Figure 1) is carried out discharge process.
This utility model also proposes a kind of electronic equipment, and this electronic equipment includes communication output interface, and (figure is not
Illustrate) and communication interface current supply circuit (not shown) as above, described communication interface current supply circuit
It is connected with described communication output interface.Wherein, described communication interface current supply circuit and above-mentioned communication interface
The structure of current supply circuit is identical, and here is omitted.
It should be noted that described electronic equipment can be television set, it is also possible to be mobile phone or computer etc.
Electronic equipment, does not limits.When described electronic equipment is television set, described communication output interface
For HDMI (not shown)；When described electronic equipment is mobile phone, described communication output interface is
MHL interface (not shown).
The foregoing is only preferred embodiment of the present utility model, not thereby limit of the present utility model specially
Profit scope, every under inventive concept of the present utility model, in utilizing this utility model description and accompanying drawing
The equivalent structure transformation of Rong Suozuo, or directly/be indirectly used in other relevant technical fields and be included in this
In the scope of patent protection of utility model.
Claims (10)
1. a capacitor discharging circuit, in the current supply circuit of communication interface, to being connected to described power supply
The filter capacitor of loop output discharges, it is characterised in that include voltage detection module, electric discharge mould
Block and control module, described voltage detection module and discharge module are connected with described control module respectively；Its
In,
Described voltage detection module, for detecting the output voltage of described current supply circuit；
Described control module, for the output voltage size output detected according to described voltage detection module
Control signal to described discharge module accordingly；
Described discharge module, for carrying out discharge process according to described control signal to described filter capacitor.
2. capacitor discharging circuit as claimed in claim 1, it is characterised in that described voltage detection module
Including the first resistance, the second resistance, the 3rd resistance and the first switching tube；The input of described first switching tube
End is connected with the first end of described first resistance, the input of described first switching tube and described first resistance
The test side that link node is described voltage detection module；The controlled end of described first switching tube, described
Second end of the first resistance and the first end interconnection of described second resistance；The outfan of described first switching tube
It is connected with the first end of described 3rd resistance, described first switching tube and the link node of described 3rd resistance
Outfan for described voltage detection module；Second end of described second resistance and the of described 3rd resistance
Two end ground connection.
3. capacitor discharging circuit as claimed in claim 1, it is characterised in that described control module includes
4th resistance, the 5th resistance and second switch pipe；The input of described second switch pipe is used for input power
Voltage, the input that controlled end is described control module of described second switch pipe, described second switch pipe
Outfan be connected with the first end of described 4th resistance, second end and the described 5th of described 4th resistance
First end of resistance connects, and described 4th resistance is described control mould with the link node of described 5th resistance
The control end of block, the second end ground connection of described 5th resistance.
4. capacitor discharging circuit as claimed in claim 1, it is characterised in that described discharge module includes
6th resistance and the 3rd switching tube；The input of described 3rd switching tube and the second end of described 6th resistance
Connect, the energy absorption end that the first end is described discharge module of described 6th resistance；Described 3rd switch
The controlled end of pipe is the controlled end of described discharge module, the output head grounding of described 3rd switching tube.
5. a communication interface current supply circuit, it is characterised in that include such as claim 1-4 any one
Described capacitor discharging circuit.
6. an electronic equipment, it is characterised in that include communicating output interface and as claimed in claim 5
Communication interface current supply circuit, described communication interface current supply circuit is connected with described communication output interface.
7. electronic equipment as claimed in claim 6, it is characterised in that described communication output interface is
MHL interface.
8. electronic equipment as claimed in claim 6, it is characterised in that described communication output interface is
HDMI.
9. electronic equipment as claimed in claim 6, it is characterised in that described electronic equipment is television set.
10. electronic equipment as claimed in claim 6, it is characterised in that described electronic equipment is mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620327264.2U CN205595844U (en) | 2016-04-18 | 2016-04-18 | Capacitor discharge circuit, communication interface power supply loop and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620327264.2U CN205595844U (en) | 2016-04-18 | 2016-04-18 | Capacitor discharge circuit, communication interface power supply loop and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205595844U true CN205595844U (en) | 2016-09-21 |
Family
ID=56935121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620327264.2U Expired - Fee Related CN205595844U (en) | 2016-04-18 | 2016-04-18 | Capacitor discharge circuit, communication interface power supply loop and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205595844U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722126A (en) * | 2019-03-22 | 2020-09-29 | 深圳市瑞能实业股份有限公司 | Low-voltage discharge circuit, low-voltage discharge method and device |
-
2016
- 2016-04-18 CN CN201620327264.2U patent/CN205595844U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722126A (en) * | 2019-03-22 | 2020-09-29 | 深圳市瑞能实业股份有限公司 | Low-voltage discharge circuit, low-voltage discharge method and device |
| CN111722126B (en) * | 2019-03-22 | 2021-07-02 | 深圳市瑞能实业股份有限公司 | Low-voltage discharge circuit, low-voltage discharge method and device |
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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: 20160921 |