CN110113040A - Interface equipment and its control circuit - Google Patents
Interface equipment and its control circuit Download PDFInfo
- Publication number
- CN110113040A CN110113040A CN201910535650.9A CN201910535650A CN110113040A CN 110113040 A CN110113040 A CN 110113040A CN 201910535650 A CN201910535650 A CN 201910535650A CN 110113040 A CN110113040 A CN 110113040A
- Authority
- CN
- China
- Prior art keywords
- interface
- oxide
- semiconductor
- metal
- electrically connected
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00315—Modifications for increasing the reliability for protection in field-effect transistor circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018507—Interface arrangements
Abstract
The invention discloses a kind of interface equipment and its control circuit, the control circuit includes first switch controlling brancher and second switch controlling brancher；One end of first switch controlling brancher is electrically connected with the first end of the interface end of interface equipment, second switch controlling brancher respectively, and the other end of first switch controlling brancher is electrically connected with the second end of second switch controlling brancher；When interface end accesses external high voltage power supply, first switch controlling brancher is in a saturated state, and second switch controlling brancher is in an off state.The present invention protects circuit by designing the high back voltage of a kind of first switch controlling brancher and second switch controlling brancher; when interface end accesses external high voltage power supply; first switch controlling brancher is in saturation shape, and second switch controlling brancher is in an off state simultaneously; so that interface equipment has the function of anti-high pressure, and reduce the hardware cost of high-pressure modular；In addition, also having many advantages, such as fast response time and small in size.
Description
Technical field
The present invention relates to technical field of circuit design, in particular to a kind of interface equipment and its control circuit.
Background technique
Existing interface equipment typically uses anti-high pressure Load Switch (load to realize the purpose of anti-high pressure
Switch), but the price of this anti-high pressure Load Switch is more expensive than the on-load switch of generally not anti-high pressure very much (such as 6 times),
Therefore, there is higher cost in the existing interface equipment with anti-high voltage functionality.
Summary of the invention
The technical problem to be solved by the present invention is in order to overcome interface equipment in the prior art to there is lacking for higher cost
It falls into, a kind of interface equipment and its control circuit is provided.
The present invention is to solve above-mentioned technical problem by following technical proposals:
The present invention provides a kind of control circuit of interface equipment, and the control circuit includes first switch controlling brancher and
Two switch control branch circuits；
One end of the first switch controlling brancher respectively with the interface end of interface equipment, the second switch controlling brancher
First end electrical connection, the other end of the first switch controlling brancher and the second end of the second switch controlling brancher are electrically connected
It connects；
When the interface end accesses external high voltage power supply, the first switch controlling brancher is in a saturated state, described
Second switch controlling brancher is in an off state.
Optionally, the control circuit further includes on-load switch and control chip；
The on-load switch is electrically connected with the third end of the second switch controlling brancher, the control chip respectively；
The on-load switch is also electrically connected with the first power end；
The control chip goes out the interface end when not accessing external equipment for identification, controls the on-load switch and is in
Off-state；
When the control chip is also used to identify that the interface end accesses the external equipment, the on-load switch is controlled
In connection status.
Optionally, the control chip is electrically connected with the interface end of the interface equipment and enable end respectively；
The first switch controlling brancher includes transistor and first resistor；
The second switch controlling brancher includes the first metal-oxide-semiconductor (metal-oxide semiconductor fieldeffect transistor)；
The base stage of the transistor is electrically connected with one end of the first resistor, the emitter of the transistor respectively with institute
State the source electrode electrical connection of interface end, first metal-oxide-semiconductor, the grid electricity of the collector of the transistor and first metal-oxide-semiconductor
The drain electrode of connection, first metal-oxide-semiconductor is electrically connected with the on-load switch；
The other end of the first resistor is electrically connected with the interface end；
When the interface end accesses external high voltage power supply, it is outer that the control chip goes out the interface end access for identification
The resistance value for connecing high voltage power supply, and controlling to adjust first resistor makes the transistor in a saturated state, at first metal-oxide-semiconductor
In off-state.
Optionally, the first switch controlling brancher further includes second resistance and zener diode；
The other end of the first resistor is electric with one end of the second resistance and one end of the zener diode respectively
Connection, the other end of the second resistance are electrically connected with interface end；
The other end of the zener diode is grounded.
Optionally, the control circuit further includes first capacitor；
One end of the first capacitor is electrically connected with the interface end, the other end ground connection of the first capacitor.
Optionally, the control chip is electrically connected with the interface end of the interface equipment and enable end respectively；
The control circuit further includes third switch control branch circuit；
One end of the third switch control branch circuit is electrically connected with the enable end of the interface equipment, the third switch control
The other end of branch processed is electrically connected with the grid of first metal-oxide-semiconductor；
When the interface end accesses external equipment, it is described outer that the control chip goes out the interface end access for identification
Connect equipment；
The control chip is also used to control the enable end input low level of the interface equipment, so that the third switchs
The other end of controlling brancher exports low level, and first metal-oxide-semiconductor is in the conductive state, and the on-load switch passes through the interface
It holds to the external equipment and inputs the first power supply.
Optionally, the third switch control branch circuit includes the second metal-oxide-semiconductor and 3rd resistor；
The grid of second metal-oxide-semiconductor is electrically connected with the enable end of the interface equipment, the drain electrode of second metal-oxide-semiconductor with
One end of the 3rd resistor is electrically connected, and the other end of the 3rd resistor is electrically connected with the grid of first metal-oxide-semiconductor, described
The source electrode of second metal-oxide-semiconductor is grounded.
Optionally, the third switch control branch circuit further includes third metal-oxide-semiconductor and the second capacitor；
The grid of the third metal-oxide-semiconductor is electrically connected with the enable end of the interface equipment, the drain electrode point of the third metal-oxide-semiconductor
It is not electrically connected with the grid of one end of second capacitor, second metal-oxide-semiconductor；
The source electrode of the third metal-oxide-semiconductor, second capacitor the other end be grounded.
Optionally, the control circuit further includes the 4th resistance, second source end and the 5th resistance；
One end of 4th resistance is electrically connected with the second source end, the other end of the 4th resistance and described the
The drain electrode of three metal-oxide-semiconductors is electrically connected；
One end of 5th resistance is electrically connected with the interface end, the other end of the 5th resistance and third electricity
The other end of resistance is electrically connected.
Optionally, the control circuit further includes the 4th switch control branch circuit；
One end of 4th switch control branch circuit is electrically connected with the interface end, the 4th switch control branch circuit it is another
One end ground connection；
When interface end cutting and the connection of the external equipment, the control chip goes out the interface for identification
The connection of end cutting and the external equipment；
The control chip is also used to control the enable end input high level of the interface equipment, so that the 4th switch
Controlling brancher is in the conductive state, and the residual charge in the interface end is discharged to ground.
Optionally, the 4th switch control branch circuit includes the 4th metal-oxide-semiconductor and the 6th resistance；
The grid of 4th metal-oxide-semiconductor is electrically connected with the enable end of the interface equipment；
The drain electrode of 4th metal-oxide-semiconductor is electrically connected with one end of the 6th resistance, and the source electrode of the 4th metal-oxide-semiconductor connects
The other end on ground, the 6th resistance is electrically connected with the interface end；
When interface end cutting and the connection of the external equipment, the 4th metal-oxide-semiconductor conducting.
Optionally, the control circuit further includes third capacitor；
One end of the third capacitor is electrically connected with the grid of the 4th metal-oxide-semiconductor, another termination of the third capacitor
Ground.
Optionally, the interface end is Type-C interface (a kind of interface)；And/or
First metal-oxide-semiconductor, second metal-oxide-semiconductor, the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are PMOS tube.
The present invention also provides a kind of interface equipment, the interface equipment includes the control circuit of above-mentioned interface equipment.
The positive effect of the present invention is that:
In the present invention, by the high back voltage protection for designing a kind of first switch controlling brancher and second switch controlling brancher
Circuit, when interface end accesses external high voltage power supply, first switch controlling brancher is in the saturation shape branch of second switch control simultaneously
Road is in an off state, so that interface equipment has the function of anti-high pressure, and reduces the hardware cost of high-pressure modular, has
Enhance the market competitiveness of interface equipment to effect；In addition, also having many advantages, such as fast response time and small in size.
Detailed description of the invention
Fig. 1 is the circuit diagram of the control circuit of the interface equipment of the embodiment of the present invention 1.
Fig. 2 is the circuit diagram of the control circuit of the interface equipment of the embodiment of the present invention 2.
Fig. 3 is the high voltage protective schematic diagram of the control circuit of the interface equipment of the embodiment of the present invention 2.
Fig. 4 is the first circuit diagram of the control circuit of the interface equipment of the embodiment of the present invention 3.
Fig. 5 is the second circuit figure of the control circuit of the interface equipment of the embodiment of the present invention 3.
Fig. 6 is the first circuit diagram of the control circuit of the interface equipment of the embodiment of the present invention 4.
Fig. 7 is the second circuit figure of the control circuit of the interface equipment of the embodiment of the present invention 4.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
Embodiment 1
As shown in Figure 1, the control circuit of the interface equipment of the present embodiment includes that first switch controlling brancher L1 and second open
Close controlling brancher L2.
Specifically, one end of first switch controlling brancher L1 respectively with the interface end CONN of interface equipment, second switch control
The first end of branch L2 processed is electrically connected, the other end of first switch controlling brancher L1 and the second end of second switch controlling brancher L2
Electrical connection；
When interface end CONN accesses external high voltage power supply, first switch controlling brancher L1 is in a saturated state, and second opens
Controlling brancher L2 is closed to be in an off state.
In the present embodiment, by the high back voltage guarantor for designing a kind of first switch controlling brancher and second switch controlling brancher
Protection circuit, when interface end accesses external high voltage power supply, first switch controlling brancher is in the second switch control simultaneously of saturation shape
Branch is in an off state, so that interface equipment has the function of anti-high pressure, and reduces the hardware cost of high-pressure modular,
Effectively enhance the market competitiveness of interface equipment；In addition, also having many advantages, such as fast response time and small in size.
Embodiment 2
The control circuit of the interface equipment of the present embodiment is the further improvement to embodiment 1, specifically:
As shown in Fig. 2, control circuit further includes on-load switch Load Switch and control chip CC；
On-load switch Load Switch is electrically connected with the third end of second switch controlling brancher L1, control chip 2 respectively；
On-load switch Load Switch is also electrically connected with the first power end；
Chip 2 is controlled when outgoing interface end CONN does not access external equipment for identification, controls on-load switch Load Switch
It is in an off state；
When control chip 2 is also used to identify that interface end CONN accesses external equipment, on-load switch Load Switch is controlled
In connection status.
Control chip 2 is electrically connected with the interface end CONN of interface equipment and enable end EN respectively.
Specifically, first switch controlling brancher L1 includes transistor Q1, first resistor R1, second resistance R2, two pole of pressure stabilizing
Pipe CR and first capacitor C1.
Second switch controlling brancher L2 includes the first metal-oxide-semiconductor Q2；
The base stage of transistor Q1 is electrically connected with one end of first resistor R1, the emitter of transistor Q1 respectively with interface end
The source electrode electrical connection of CONN, the first metal-oxide-semiconductor Q2, the collector of transistor Q1 are electrically connected with the grid of the first metal-oxide-semiconductor Q2, and first
The drain electrode of metal-oxide-semiconductor Q2 is electrically connected with on-load switch Load Switch's；
The other end of first resistor R1 is electrically connected with interface end CONN；
When interface end CONN accesses external high voltage power supply, CONN access in outgoing interface end is external for identification for control chip 2
High voltage power supply, and the resistance value for controlling to adjust first resistor R1 makes transistor Q1 in a saturated state, the first metal-oxide-semiconductor Q2 is in disconnected
Open state.
The other end of first resistor R1 is electrically connected with one end of one end of second resistance R2 and zener diode CR respectively, the
The other end of two resistance R2 is electrically connected with interface end CONN；
The other end of zener diode CR is grounded.
One end of first capacitor C1 is electrically connected with interface end CONN, the other end ground connection of first capacitor C1.
In the present embodiment, when interface end CONN accesses high voltage, the resistance value by adjusting first resistor R1 makes crystal
Pipe Q1 can fast conducting and in a saturated state so that the voltage VGS=0 of the grid of the first metal-oxide-semiconductor Q2 and source electrode, this
When the first metal-oxide-semiconductor Q2 disconnect, so that high pressure be isolated, play the role of high voltage protective.
Wherein, response speed ensure that using transistor Q1, is enable to respond quickly voltage change situation of change, effectively contracts
Short reaction time.
In addition, the high back voltage that above-mentioned first switch controlling brancher and second switch controlling brancher are constituted protects circuit mould
Block price combines compared with the on-load switch of existing anti-high pressure using cheap component is ingenious, final to realize
Quick response is isolated high pressure and significantly reduces circuit design cost and input cost.
Specifically, as shown in figure 3, abscissa indicates that (unit s), ordinate indicate voltage U (unit V) to time t.Curve a
Indicate that the corresponding voltage change curve of on-load switch, curve b indicate that the voltage change curve in interface end, curve c indicate access
External voltage voltage change curve, wherein occur voltage in curve c and gradually rise for d sections, it is corresponding in curve a at the same time
Voltage be pulled low, to play the role of high voltage protective.
In the present embodiment, by the high back voltage guarantor for designing a kind of first switch controlling brancher and second switch controlling brancher
Protection circuit, when interface end accesses external high voltage power supply, first switch controlling brancher is in the second switch control simultaneously of saturation shape
Branch is in an off state, so that interface equipment has the function of anti-high pressure, and reduces the hardware cost of high-pressure modular,
Effectively enhance the market competitiveness of interface equipment；In addition, also having many advantages, such as fast response time and small in size.
Embodiment 3
As shown in figure 4, the control circuit of the interface equipment of the present embodiment is the further improvement to embodiment 2, specifically:
Control circuit further includes third switch control branch circuit L3；
One end of third switch control branch circuit L3 is electrically connected with the enable end EN of interface equipment, third switch control branch circuit L3
The other end be electrically connected with the grid of the first metal-oxide-semiconductor Q2；
When interface end CONN accesses external equipment, outgoing interface end CONN accesses external equipment to control chip 2 for identification；
Control chip 2 is also used to the enable end EN input low level of control interface equipment, so that third switch control branch circuit
The other end of L3 exports low level, and the first metal-oxide-semiconductor Q2 is in the conductive state, and on-load switch Load Switch passes through interface end
CONN inputs the first power supply to external equipment.
Specifically, as shown in figure 5, third switch control branch circuit L3 includes the second metal-oxide-semiconductor Q3,3rd resistor R3, the 3rd MOS
Pipe Q4 and the second capacitor C2.
The grid of second metal-oxide-semiconductor Q3 is electrically connected with the enable end EN of interface equipment, the drain electrode of the second metal-oxide-semiconductor Q3 and third electricity
One end electrical connection of R3 is hindered, the other end of 3rd resistor R3 is electrically connected with the grid of the first metal-oxide-semiconductor Q2, the source of the second metal-oxide-semiconductor Q3
Pole ground connection.
The grid of third metal-oxide-semiconductor Q4 is electrically connected with the enable end EN of interface equipment, and the drain electrode of third metal-oxide-semiconductor Q4 is respectively with
The grid electrical connection of one end of two capacitor C2, the second metal-oxide-semiconductor Q3；
The source electrode of third metal-oxide-semiconductor Q4, the second capacitor C2 the other end be grounded.
Control circuit further includes the 4th resistance R4, second source end and the 5th resistance R5；
One end of 4th resistance R4 is electrically connected with second source end 2, and the other end of the 4th resistance R4 is with third metal-oxide-semiconductor Q4's
Drain electrode electrical connection；
One end of 5th resistance R5 is electrically connected with interface end CONN, and the other end of the 5th resistance R5 is another with 3rd resistor R3's
One end electrical connection.
In the control circuit of the present embodiment, when interface end CONN accesses external equipment, the enable end EN of interface equipment is defeated
Enter low level, third metal-oxide-semiconductor Q4 is closed, the second metal-oxide-semiconductor Q3 conducting, the first metal-oxide-semiconductor Q2 conducting, and on-load switch is by the first power end
+ 5V the power supply of input is exported by the first metal-oxide-semiconductor Q2 to interface end CONN, is powered to external equipment.
In the present embodiment, by the high back voltage guarantor for designing a kind of first switch controlling brancher and second switch controlling brancher
Protection circuit, when interface end accesses external high voltage power supply, first switch controlling brancher is in the second switch control simultaneously of saturation shape
Branch is in an off state, so that interface equipment has the function of anti-high pressure；And the hardware cost of high-pressure modular is reduced,
Effectively enhance the market competitiveness of interface equipment；In addition, also having many advantages, such as fast response time and small in size；Meanwhile it is logical
It crosses third switch control branch circuit and realizes that interface equipment charges normal function to external equipment.
Embodiment 4
The control circuit of the interface equipment of the present embodiment is the further improvement to embodiment 3, specifically:
As shown in fig. 6, control circuit further includes the 4th switch control branch circuit L4；
One end of 4th switch control branch circuit L4 is electrically connected with interface end CONN, the other end of the 4th switch control branch circuit L4
Ground connection；
When interface end CONN cutting and the connection of external equipment, outgoing interface end CONN is cut off control chip 2 for identification
With the connection of external equipment；
Control chip 2 is also used to the enable end EN input high level of control interface equipment, so that the 4th switch control branch circuit
L4 is in the conductive state, and the residual charge in interface end CONN is discharged to ground.
Specifically, as shown in fig. 7, the 4th switch control branch circuit L4 includes the 4th metal-oxide-semiconductor Q5 and the 6th resistance R6；
The grid of 4th metal-oxide-semiconductor Q5 is electrically connected with the enable end EN of interface equipment；
The drain electrode of 4th metal-oxide-semiconductor Q5 is electrically connected with one end of the 6th resistance R6, the source electrode ground connection of the 4th metal-oxide-semiconductor Q5, and the 6th
The other end of resistance R6 is electrically connected with interface end CONN；
When interface end CONN cutting and the connection of external equipment, the 4th metal-oxide-semiconductor Q5 conducting.
Control circuit further includes third capacitor C3；
One end of third capacitor C3 is electrically connected with the grid of the 4th metal-oxide-semiconductor Q5, the other end ground connection of third capacitor C3.
Wherein, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are PMOS tube.
In addition, interface end includes but is not limited to Type-C interface.
In the control circuit of the present embodiment, by external equipment, after interface end CONN extraction, interface end CONN can be remaining
Charge, it is contemplated that the interface end of residual charge will affect the initialization operation of the external equipment accessed next time, it is therefore desirable to will
Residual charge is bled off；Specifically, by the enable end EN input high level of interface equipment, so that the first metal-oxide-semiconductor Q2, the 2nd MOS
Pipe Q3 is disconnected, the 4th metal-oxide-semiconductor Q5 conducting, directly by residual charge repid discharge to ground.
In addition, the circuit design in the present embodiment is flexible, point can be protected by changing the resistance value adjustment of non-essential resistance.
In the present embodiment, by the high back voltage guarantor for designing a kind of first switch controlling brancher and second switch controlling brancher
Protection circuit, when interface end accesses external high voltage power supply, first switch controlling brancher is in the second switch control simultaneously of saturation shape
Branch is in an off state, so that interface equipment has the function of anti-high pressure；And the hardware cost of high-pressure modular is reduced,
Effectively enhance the market competitiveness of interface equipment；In addition, also having many advantages, such as fast response time and small in size；Meanwhile it is logical
Cross the normal charge mode that third switch control branch circuit realizes interface equipment；In addition, being worked as by the realization of the 4th switch control branch circuit
Interface end residual charge discharges when external equipment extracts interface end, so that guaranteeing can be normal when external equipment accesses again
Initialization.
Embodiment 5
The interface equipment of the present embodiment includes the control electricity of the interface equipment in embodiment 1 to 4 in any one embodiment
Road.
Interface equipment in the present embodiment can not only be powered external equipment, and have the function of anti-high pressure；Separately
Outside, interface end residual charge discharges when extracting interface end to external equipment, so that guaranteeing that external equipment accesses again is energy
Enough normal initializations.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (14)
1. a kind of control circuit of interface equipment, which is characterized in that the control circuit includes first switch controlling brancher and
Two switch control branch circuits；
One end of the first switch controlling brancher respectively with the interface end of interface equipment, the second switch controlling brancher
One end electrical connection, the other end of the first switch controlling brancher are electrically connected with the second end of the second switch controlling brancher；
When the interface end accesses external high voltage power supply, the first switch controlling brancher is in a saturated state, and described second
Switch control branch circuit is in an off state.
2. the control circuit of interface equipment as described in claim 1, which is characterized in that the control circuit further includes that load is opened
Close and control chip；
The on-load switch is electrically connected with the third end of the second switch controlling brancher, the control chip respectively；
The on-load switch is also electrically connected with the first power end；
The control chip goes out the interface end when not accessing external equipment for identification, controls the on-load switch and is in and disconnects
State；
When the control chip is also used to identify that the interface end accesses the external equipment, controls the on-load switch and be in
Connection status.
3. the control circuit of interface equipment as claimed in claim 2, which is characterized in that the control chip connects with described respectively
The interface end of jaws equipment and enable end electrical connection；
The first switch controlling brancher includes transistor and first resistor；
The second switch controlling brancher includes the first metal-oxide-semiconductor；
The base stage of the transistor is electrically connected with one end of the first resistor, and the emitter of the transistor connects with described respectively
The source electrode electrical connection at mouth end, first metal-oxide-semiconductor, the collector of the transistor are electrically connected with the grid of first metal-oxide-semiconductor,
The drain electrode of first metal-oxide-semiconductor is electrically connected with the on-load switch；
The other end of the first resistor is electrically connected with the interface end；
When the interface end accesses external high voltage power supply, the control chip goes out the interface end for identification and accesses external height
Voltage source, and the resistance value for controlling to adjust first resistor makes the transistor in a saturated state, first metal-oxide-semiconductor is in disconnected
Open state.
4. the control circuit of interface equipment as claimed in claim 3, which is characterized in that the first switch controlling brancher also wraps
Include second resistance and zener diode；
The other end of the first resistor is electrically connected with one end of one end of the second resistance and the zener diode respectively,
The other end of the second resistance is electrically connected with interface end；
The other end of the zener diode is grounded.
5. the control circuit of interface equipment as described in claim 1, which is characterized in that the control circuit further includes the first electricity
Hold；
One end of the first capacitor is electrically connected with the interface end, the other end ground connection of the first capacitor.
6. the control circuit of interface equipment as claimed in claim 3, which is characterized in that the control chip connects with described respectively
The interface end of jaws equipment and enable end electrical connection；
The control circuit further includes third switch control branch circuit；
One end of the third switch control branch circuit is electrically connected with the enable end of the interface equipment, the third switch control branch
The other end on road is electrically connected with the grid of first metal-oxide-semiconductor；
When the interface end accesses external equipment, the interface end of the control chip going out for identification accesses described external set
It is standby；
The control chip is also used to control the enable end input low level of the interface equipment, so that the third switch control
The other end of branch exports low level, and first metal-oxide-semiconductor is in the conductive state, the on-load switch by the interface end to
The external equipment inputs the first power supply.
7. the control circuit of interface equipment as claimed in claim 6, which is characterized in that the third switch control branch circuit includes
Second metal-oxide-semiconductor and 3rd resistor；
The grid of second metal-oxide-semiconductor is electrically connected with the enable end of the interface equipment, the drain electrode of second metal-oxide-semiconductor with it is described
One end of 3rd resistor is electrically connected, and the other end of the 3rd resistor is electrically connected with the grid of first metal-oxide-semiconductor, and described second
The source electrode of metal-oxide-semiconductor is grounded.
8. the control circuit of interface equipment as claimed in claim 7, which is characterized in that the third switch control branch circuit is also wrapped
Include third metal-oxide-semiconductor and the second capacitor；
The grid of the third metal-oxide-semiconductor is electrically connected with the enable end of the interface equipment, the drain electrode of the third metal-oxide-semiconductor respectively with
The grid electrical connection of one end of second capacitor, second metal-oxide-semiconductor；
The source electrode of the third metal-oxide-semiconductor, second capacitor the other end be grounded.
9. the control circuit of interface equipment as claimed in claim 8, which is characterized in that the control circuit further includes the 4th electricity
Resistance, second source end and the 5th resistance；
One end of 4th resistance is electrically connected with the second source end, the other end of the 4th resistance and the third
The drain electrode of metal-oxide-semiconductor is electrically connected；
One end of 5th resistance is electrically connected with the interface end, the other end and the 3rd resistor of the 5th resistance
Other end electrical connection.
10. the control circuit of interface equipment as claimed in claim 8, which is characterized in that the control circuit further includes the 4th
Switch control branch circuit；
One end of 4th switch control branch circuit is electrically connected with the interface end, the other end of the 4th switch control branch circuit
Ground connection；
When interface end cutting and the connection of the external equipment, the control chip goes out the interface end for identification and cuts
The disconnected connection with the external equipment；
The control chip is also used to control the enable end input high level of the interface equipment, so that the 4th switch control
Branch is in the conductive state, and the residual charge in the interface end is discharged to ground.
11. the control circuit of interface equipment as claimed in claim 10, which is characterized in that the 4th switch control branch circuit packet
Include the 4th metal-oxide-semiconductor and the 6th resistance；
The grid of 4th metal-oxide-semiconductor is electrically connected with the enable end of the interface equipment；
The drain electrode of 4th metal-oxide-semiconductor is electrically connected with one end of the 6th resistance, the source electrode ground connection of the 4th metal-oxide-semiconductor, institute
The other end for stating the 6th resistance is electrically connected with the interface end；
When interface end cutting and the connection of the external equipment, the 4th metal-oxide-semiconductor conducting.
12. the control circuit of interface equipment as claimed in claim 11, which is characterized in that the control circuit further includes third
Capacitor；
One end of the third capacitor is electrically connected with the grid of the 4th metal-oxide-semiconductor, the other end ground connection of the third capacitor.
13. the control circuit of interface equipment as claimed in claim 11, which is characterized in that the interface end connects for Type-C
Mouthful；And/or
First metal-oxide-semiconductor, second metal-oxide-semiconductor, the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are PMOS tube.
14. a kind of interface equipment, which is characterized in that the interface equipment includes described in any one of claim 1 to 13
The control circuit of interface equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535650.9A CN110113040A (en) | 2019-06-20 | 2019-06-20 | Interface equipment and its control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535650.9A CN110113040A (en) | 2019-06-20 | 2019-06-20 | Interface equipment and its control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110113040A true CN110113040A (en) | 2019-08-09 |
Family
ID=67495564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910535650.9A Pending CN110113040A (en) | 2019-06-20 | 2019-06-20 | Interface equipment and its control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110113040A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203166467U (en) * | 2013-03-20 | 2013-08-28 | 向智勇 | Overvoltage protection circuit |
| WO2015051730A1 (en) * | 2013-10-08 | 2015-04-16 | 无锡华润上华半导体有限公司 | High-voltage startup circuit |
| CN204441951U (en) * | 2015-02-26 | 2015-07-01 | 青岛歌尔声学科技有限公司 | A kind of charge-discharge circuit and charger baby |
| CN106033241A (en) * | 2015-03-18 | 2016-10-19 | 鸿富锦精密工业(武汉)有限公司 | Interface power supply circuit |
| CN205754544U (en) * | 2016-04-28 | 2016-11-30 | 北京旷视科技有限公司 | The circuit structure of a kind of USB output controlled power and camera system |
| CN206195365U (en) * | 2016-07-04 | 2017-05-24 | 深圳市踏路科技有限公司 | Mobile power supply apparatus |
| CN109888856A (en) * | 2017-12-06 | 2019-06-14 | 和硕联合科技股份有限公司 | Electronic device and its electric discharge device |
| CN210041791U (en) * | 2019-06-20 | 2020-02-07 | 无锡睿勤科技有限公司 | Interface device and control circuit thereof |
-
2019
- 2019-06-20 CN CN201910535650.9A patent/CN110113040A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203166467U (en) * | 2013-03-20 | 2013-08-28 | 向智勇 | Overvoltage protection circuit |
| WO2015051730A1 (en) * | 2013-10-08 | 2015-04-16 | 无锡华润上华半导体有限公司 | High-voltage startup circuit |
| CN204441951U (en) * | 2015-02-26 | 2015-07-01 | 青岛歌尔声学科技有限公司 | A kind of charge-discharge circuit and charger baby |
| CN106033241A (en) * | 2015-03-18 | 2016-10-19 | 鸿富锦精密工业(武汉)有限公司 | Interface power supply circuit |
| CN205754544U (en) * | 2016-04-28 | 2016-11-30 | 北京旷视科技有限公司 | The circuit structure of a kind of USB output controlled power and camera system |
| CN206195365U (en) * | 2016-07-04 | 2017-05-24 | 深圳市踏路科技有限公司 | Mobile power supply apparatus |
| CN109888856A (en) * | 2017-12-06 | 2019-06-14 | 和硕联合科技股份有限公司 | Electronic device and its electric discharge device |
| CN210041791U (en) * | 2019-06-20 | 2020-02-07 | 无锡睿勤科技有限公司 | Interface device and control circuit thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI717887B (en) | A protection circuit | |
| CN201113384Y (en) | Electricized overvoltage protection circuit and mobile terminal possessing the circuit | |
| CN102684656B (en) | Gate circuit | |
| CN106300314A (en) | The high voltage protective system and method for Type C interface chip CC pin | |
| CN106786353A (en) | A kind of overvoltage crowbar | |
| CN104022634A (en) | Energy-storage capacitor type high-voltage and low-voltage surge suppression circuit and suppression method thereof | |
| CN204089183U (en) | A kind of can the Anti-surging mains switch protective circuit of frequent | |
| CN103166444A (en) | Remote turn-off control signal receiving circuit | |
| CN107834531A (en) | A kind of protection device of chip I/O Interface | |
| CN105978300A (en) | Cascading type high-voltage solid-state switch | |
| US11755046B2 (en) | Supply voltage regulator | |
| CN108055028A (en) | A kind of delay startup controllable power switch of multi-functional unification | |
| CN104184127B (en) | Battery protecting circuit | |
| CN107979281A (en) | A kind of input voltage division module and overvoltage protection switch | |
| CN110113040A (en) | Interface equipment and its control circuit | |
| EP3579497A1 (en) | Power sourcing equipment and power over ethernet system | |
| CN105743059A (en) | Output over-current protection circuit formed by reference source and resistor | |
| WO2020036829A3 (en) | Ac controlled relay drive circuit | |
| CN207732419U (en) | A kind of protective device of chip I/O Interface | |
| CN210041791U (en) | Interface device and control circuit thereof | |
| CN204681073U (en) | Data and charging coffret protective circuit | |
| CN208190245U (en) | A kind of MOSFET grid protection circuit | |
| CN207573236U (en) | A kind of Switching Power Supply start-up circuit | |
| CN116683755B (en) | Slow start circuit and multi-level slow start circuit | |
| CN209627343U (en) | A kind of delay startup controllable power switch of multi-functional unification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |