CN205015885U - Switching circuit and electron device - Google Patents
Switching circuit and electron device Download PDFInfo
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- CN205015885U CN205015885U CN201520754342.2U CN201520754342U CN205015885U CN 205015885 U CN205015885 U CN 205015885U CN 201520754342 U CN201520754342 U CN 201520754342U CN 205015885 U CN205015885 U CN 205015885U
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Abstract
The present case discloses a switching circuit and electron device, and the switching circuit includes that a USB charges the specification and detects chip, usb signal control and switching circuit, selector and charging current control circuit. The specification of charging a USB detects the type of the first USB port of chip assay to produce first testing result signal. Usb signal controls and a switching circuit electric connection USB charges, and the specification detects the chip, is controlled by first testing result signal to the decision lets a central processing unit and first USB port carry out data transmission. The signal battery that the selector provided first USB port gives battery charger with one of them of power input port's the 2nd signal battery. Charging current control circuit adjusts the electric current that battery charger charges to the battery according to a signal battery, the 2nd signal battery with first testing result signal generate current control signal. This switching circuit has very fast switching efficiency and can reduce software development time -histories and cost.
Description
Technical field
This case technical field of circuit design, particularly relate to the commutation circuit switching multiple USB (universal serial bus) (UniversalSerialBus, USB) device and power supply signal (coming from the power supply signal of power supply adaptor or USB device) with hardware implementing.
Background technology
Electronic installation all can arrange external-connected port to connect external connected electronic device or power supply adaptor, to carry out Signal transmissions with external connected electronic device or to receive power supply signal (coming from the power supply signal of power supply adaptor or external connected electronic device).Multiple external-connected ports of current electronic installation on the market have the power input port of USB port and circular hole mostly.
The quantity (quantity corresponding to USB port) of the USB device that electronic installation can be supported determined by the chipset in it.If desired support more USB device, then need to set up circuit switched, and control to switch by software program.But USB switches to hand over USB and holds (handshake) and easily affect each other.For example, when user inserts two USB device in different two USB port simultaneously, electronic installation may successfully identification USB device.In addition, according to 1.2 editions rechargeable standard (batterychargespecification1.2) of current USB, electronic installation when USB device is inserted in USB port, can detect the current type (type) of USB port, to determine charging current.
If when USB device and power supply adaptor are inserted in electronic installation simultaneously, then need to be further advanced by software to judge process, to determine that electronic installation uses the power supply signal from USB device or power supply adaptor, namely determine the transmission path of power supply signal.If carry out judgement process by software, then USB driver and charger driver may need to revise further.On the other hand, also there is chip that to set up in electronic installation and support dual input power supply in current industry or use diode to merge the practice of two power supply signals to process above-mentioned situation.But, set up the chip of supporting dual input power supply and can increase extra restriction to electronic installation, use diode to merge two power supply signals and can increase extra power consumption because voltage drop produces again, and temporal delay can be caused again by software exchange and need software development time-histories.
Utility model content
This case provides a kind of hardware implementing to switch the commutation circuit of multiple general-purpose serial bus USB device and power supply signal, can cause again temporal delay and the technical matters needing software development time-histories to solve by software exchange.
This case embodiment provides a kind of hard-wired commutation circuit, and this commutation circuit comprises a USB charging specification detection chip, usb signal controls and commutation circuit, selector switch and charging current control circuit.One USB charging specification detection chip detects the type of the first USB port, to produce the first testing result signal.Usb signal controls to be electrically connected a USB with commutation circuit and to charge specification detection chip, is controlled by the first testing result signal, to determine to allow CPU (central processing unit) and the first USB port or the second USB port carry out data transmission.Selector switch provides one of them device that charges the battery of the first power supply signal of the first USB port and the second source signal of power input port.Charging current control circuit foundation the first power supply signal, second source signal and the first testing result signal generation current control signal adjust the electric current that battery charger charges to battery.
This case embodiment also provides a kind of electronic installation, and this electronic installation comprises the first USB port, the second USB port, power input port, CPU (central processing unit), battery charger and above-mentioned commutation circuit.
Comprehensive the above, compared to tradition by switching the mode of USB device and suitable power supply signal, the hard-wired commutation circuit of this case embodiment and the electronic installation with this commutation circuit have switching efficiency and can reduce software development time-histories and cost faster.
For enable feature and the technology contents of further understanding this case, refer to the following detailed description about this case and accompanying drawing, but these illustrate and accompanying drawing Figure of description is only used for this case is described, but not any restriction is done to the interest field of this case.
Accompanying drawing explanation
Fig. 1 is the calcspar of the electronic installation that this case embodiment provides.
Fig. 2 is the calcspar of the selector switch of the commutation circuit that this case embodiment provides.
Fig. 3 is the schematic diagram that the electronic installation of this case embodiment is connected with multiple USB device and power supply adaptor.
Description of reference numerals:
1: electronic installation
10: commutation circuit
101:USB signal controls and commutation circuit
102:USB charging specification detection chip
103: charging current control circuit
104: selector switch
1041: the first switches
1042: second switch
1043: phase inverter
11: the first USB port
12: the second USB port
13: power input port
14: CPU (central processing unit)
15: battery charger
31: the first USB device
32: the second USB device
33: power supply adaptor
D+, D-: data-signal
VBUS1, VBUS2, VDC_IN: power supply signal
USB_1, USB_2:USB signal
Embodiment
The commutation circuit that this case embodiment provides a kind of hardware to realize, the usb signal that its USB device detecting the multiple USB port being inserted in electronic installation by hardware transmits, and switch the path of multiple usb signal by this, therefore do not need to carry out detection by software to switch, therefore software complexity can be reduced and increase system range of application.Above-mentioned hard-wired commutation circuit also can detect multiple power supply signal, and is switched to suitable power supply signal rapidly, and does not have extra voltage drop generation, therefore can avoid software exchange mistake and the selectivity increasing rear end part.
Briefly, the commutation circuit that this case embodiment provides is controlled by hardware to the switching that the transmission path of power supply signal and usb signal carry out, instead of pass through software program, therefore except software exchange can be avoided to have except the delay of busy generation, the degree of freedom that software development time-histories and elevator system design can more be reduced.
The commutation circuit that this case embodiment provides comprises usb signal and controls to charge with commutation circuit, USB specification detection chip, charging current control circuit and selector switch.Described commutation circuit is arranged in electronic installation, in another embodiment of this case, more provides the electronic installation with above-mentioned commutation circuit.
In this case embodiment, charge specification detection chip of USB receives data-signal D+, D-that the first USB port of coming from electronic installation transmits, to detect the current type of the first USB port by this, and the testing result signal producing the current type of instruction first USB port controls and commutation circuit to usb signal.Usb signal controls receive with commutation circuit to come from the first USB port of electronic installation and the usb signal of the second USB port, and switch multiple USB device according to the power supply signal VBUS in this multiple usb signal and testing result signal, to select to allow one of them USB device control to carry out data transmission with the CPU (central processing unit) in commutation circuit and electronic installation by usb signal, CPU (central processing unit) is namely selected to communicate with wherein one of the second USB port with the first USB port.
The battery charger that selector switch can select to allow wherein one of the power supply signal coming from the first USB port and power input port to be sent to electronic installation according to the power supply signal VBUS coming from the first USB port and the power supply signal VDC_IN coming from power input port.Charging current control circuit is then to charge the battery device according to testing result signal, the power supply signal VBUS coming from the first USB port and the power supply signal VDC_IN generation current control signal of power input port, determines the electric current charged to battery to allow battery charger according to current controling signal.
Below by the details of coordinate word to explain with accompanying drawing commutation circuit that this case embodiment provides and electronic installation.Note that following embodiment is only that this case is described at this, it is also not used to limit this case.
First, please refer to Fig. 1, Fig. 1 is the calcspar of the electronic installation that this case embodiment provides.Electronic installation 1 comprises by hard-wired commutation circuit 10, first USB port 11, second USB port 12, power input port 13, CPU (central processing unit) 14 and battery charger 15.In this embodiment, electronic installation 1 can be various portable unit, such as smart mobile phone, panel computer or object wearing device, and the type of this case not limiting electronic device 1.
In this embodiment, commutation circuit 10 comprises USB charging specification detection chip 102, usb signal controls and commutation circuit 101, selector switch 104 and charging current control circuit 103.USB charges, and specification detection chip 102 is electrically connected the first USB port 11, usb signal controls and commutation circuit 101 and charging current control circuit 103.Usb signal controls to be electrically connected the first USB port 11, second USB port 12 and CPU (central processing unit) 14 with commutation circuit 101.Selector switch 104 is electrically connected the first USB port 11, power input port 13 battery charger 15.Charging current control circuit 103 is electrically connected the first USB port 11, power input port 13 battery charger 15.
USB charging specification detection chip 102 detects the current type of the first USB port 11 by data-signal D+, the D-coming from the first USB port 11, to produce testing result signal, wherein the current type (or testing result signal) of the first USB port 11 indicates its size of current that can supply of first USB device connected and whether can transmit data to electronic installation.Then, usb signal controls with commutation circuit 101 that foundation testing result signal, the power supply signal VBUS1 that comes from the first USB port 11 determine to allow CPU (central processing unit) 14 communicate with the first USB port 11 or the second USB port 12, to carry out data transmission with the power supply signal VBUS2 coming from the second USB port 12 further.
Standard down port (StandardDownstreamPort is defined in 1.2 editions rechargeable standard that USB application person forum (USB-IF) formulates, SDP), charge downlink port (ChargingDownstreamPort, CDP) with the USB port of the three types of special charging port (DedicatedChargingPort, DCP).The USB port of SDP type can extract the electric current of 500 milliamperes to the USB device of its connection, and allows USB device and electronic installation to carry out data transmission.The USB port of CDP type can extract the electric current of 500 milliamperes or 1.5 amperes to the USB device of its connection, and allows USB device and electronic installation to carry out data transmission.The USB port of DCP type to its USB device connected extracting the electric current of 500 milliamperes or 1.5 amperes, but only can in order to charging, and not allow USB device and electronic installation to carry out data transmission.
For example, if the first USB port 11 is connected to the USB device being only used for supplying power supply, such as USB charger or portable power source (type of its USB port is DCP type), and the second USB port 12 connects the USB port (can be the USB port of SDP type or CDP type) of notebook computer or desktop computer, then USB charging specification detection chip 102 can judge that the current type of the first USB port 11 is DCP type.Now, usb signal controls to select to allow CPU (central processing unit) 14 communicate with the second USB port 12 with commutation circuit 101, and to carry out data transmission, namely, usb signal USB_2 can transmit between the second USB port 12 and CPU (central processing unit) 14.
Lift an example again, if the first USB port 11 is connected to the USB port (can be the USB port of SDP type or CDP type) of notebook computer or desktop computer, and the second USB port 12 does not connect any USB device or connect the USB device (power supply signal VBUS is logic low potential) of initiatively not powering, then USB charging specification detection chip 102 can judge that the current type of the second USB port 11 is SDP or CDP type.Now, usb signal controls to select to allow CPU (central processing unit) 14 communicate with the first USB port 11 with commutation circuit 101, and to carry out data transmission, namely, usb signal USB_1 can transmit between the first USB port 11 and CPU (central processing unit) 14.
Lift again an example, if the first USB port 11 and the second USB port 12 are all connected to the USB port (can be the USB port of SDP type or CDP type) of notebook computer or desktop computer, then now, according to power supply signal VBUS1, VBUS1 and testing result signal, usb signal controls can only allow CPU (central processing unit) 14 communicate with the first USB port 11 with presetting with commutation circuit 101, or by the mode of time division multiplexing, communicate with allowing CPU (central processing unit) 14 and the first USB port 11 and the second USB port 12 timesharing.
Can be known by above-mentioned example, when the power supply signal VBUS2 of the power supply signal VBUS1 in the first USB port 11 and the second USB port 12 is all logic high potential, usb signal controls to judge whether the first USB port 11 can carry out data transmission with commutation circuit 101 by the charge testing result signal of specification detection chip 102 of USB, during to be only not used in order to charging in the first USB port 11 carry out data transmission, select to allow the second USB port 12 communicate with between CPU (central processing unit) 14.
Selector switch 104 comes from the power supply signal VBUS1 of the first USB port 11 in order to receive and comes from the power supply signal VDC_IN of power input port 13, and allows one of them of power supply signal VBUS1 and VDC_IN be sent to battery charger 15 according to power supply signal VBUS1 and VDC_IN decision.Charging current control circuit 103 can receive the charge testing result signal of specification detection chip 102 of power supply signal VBUS1 and VDC_IN and USB to be carried out generation current control signal and to charge the battery device 15, with the electric current allowing battery charger 15 charge to battery according to current controling signal adjustment.
For example, if power supply signal VBUS1 and VDC_IN is logic high potential, then power supply signal VBUS1 or VDC_IN optionally can be given battery charger 15 as supply power supply by selector switch 104.If power supply signal VBUS1 and VDC_IN is logic high potential and logic low potential respectively, then power supply signal VBUS1 can be given battery charger 15 as supply power supply by selector switch 104.If power supply signal VBUS1 and VDC_IN is logic low potential and logic high potential respectively, then power supply signal VDC_IN can be given battery charger 15 as supply power supply by selector switch 104.
Although note that the commutation circuit 10 of above-described embodiment only detects the current type of the first USB port 11 to produce testing result signal at this, but this case is not restricted to this.In other embodiments, commutation circuit 10 more can have the current type that another USB charging specification detection chip detects the second USB port 12, to produce another testing result signal.Then, usb signal controls to determine to allow CPU (central processing unit) 14 communicate with the first USB port 11 or the second USB port 12, to carry out data transmission with the power supply signal VBUS2 coming from the second USB port 12 according to two testing result signals, the power supply signal VBUS1 that comes from the first USB port 11 with commutation circuit 101.
In addition, in other embodiments, selector switch 104 more can receive the power supply signal coming from the second USB port 12, with all power supply signals received according to it, one of them of all power supply signals received is delivered to the battery charger 15 of electronic installation 1, and charging current control circuit 103 is according to the power supply signal VBUS1 of the first USB port 11, the power supply signal of the second USB port 12, power supply signal VDC_IN and two testing result signal generation current control signal of power input port 13 charges the battery device 15, to allow battery charger 15 according to current controling signal adjustment to the electric current of battery charging.
In addition, selector switch 104 can be made up of multiple switch and logical circuit, but this case does not limit the implementation of selector switch 104.Please refer to Fig. 2, Fig. 2 is the calcspar of the selector switch of the commutation circuit that this case embodiment provides.Selector switch 104 comprises the first switch 1041, second switch 1042 and phase inverter 1043.The control end of the first switch 1041 is electrically connected the output terminal of phase inverter 1043 and reception power supply signal VBUS1, and the input end of the first switch 1041 receives power supply signal VBUS1, and the output terminal of the first switch 1041 is electrically connected the battery charger 15 of Fig. 1.The control end of second switch 1042 receives power supply signal VDC_IN, and the input end of second switch 1042 receives power supply signal VDC_IN, and the output terminal of second switch 1042 is electrically connected the battery charger 15 of Fig. 1.
Moreover please refer to Fig. 3, Fig. 3 is the schematic diagram that the electronic installation of this case embodiment is connected with multiple USB device and power supply adaptor.Electronic installation 1 can connect the first USB device 31 by the first USB port 11, connects the second USB device 32, and connect power supply adaptor 33 by power input port 13 by the second USB port 12.
In this embodiment, the type of the first USB device 31 can determine the current type of the first USB port 11.When the first USB device 31 is only in order to power to electronic installation 1, and data transmission can not be carried out with electronic installation 1, and the second USB device 32 can be carried out data transmission with electronic installation 1 and initiatively can supply power supply, then electronic installation 1 can carry out data transmission with the second USB device 32.In addition on the one hand, the power supply signal that first USB device 31 and power supply adaptor 33 provide can be the supply power supply of its battery charger by electronic installation 1, and the electric current that the current type generation current control signal of the power supply signal provided according to the first USB device 31 and power supply adaptor 33 and the first USB port 11 is charged to adjust battery charger to battery.
Generally speaking, this case embodiment provides a kind of hard-wired commutation circuit and the electronic installation with this commutation circuit, by this commutation circuit, the speed that electronic installation switches external USB device and suitable power supply signal can be accelerated, reduce time-histories and the cost of software development, reduce the probability of USB device identification failure, the degree of freedom of elevator system design, and avoid amendment USB driver and charger driver.
The above, be only this case preferably specific embodiment, and the feature of this case is not limited thereto, any those skilled in the art in the field of this case, can think easily and change or modification, all can be encompassed in the scope of the claims of following this case.
Claims (6)
1. a commutation circuit, is characterized in that, described commutation circuit comprises:
First USB (universal serial bus) (USB) is charged specification detection chip, detects the type of the first USB port, to produce the first testing result signal;
Usb signal controls and commutation circuit, is electrically connected a described USB charging specification detection chip, is controlled by described first testing result signal, to determine to allow CPU (central processing unit) and described first USB port or the second USB port carry out data transmission;
Selector switch, provides one of them device that charges the battery of the first power supply signal of described first USB port and the second source signal of power input port; And
Charging current control circuit, adjusts according to described first power supply signal, described second source signal and described first testing result signal generation current control signal the electric current that described battery charger charges to battery;
A wherein said USB charging specification detection chip produces described first testing result signal by two data-signals coming from described first USB port; Described usb signal controls to decide to allow described CPU (central processing unit) and described first USB port or described second USB port carry out data transmission according to described first testing result signal, described first power supply signal and described second source signal with commutation circuit; And described selector switch decides described first power supply signal and described second source signal one of them to be supplied to described battery charger according to the logic level of described first power supply signal and the logic level of described second source signal.
2. commutation circuit as claimed in claim 1, it is characterized in that, wherein said selector switch comprises:
First switch, its input end and control end receive described first power supply signal, and its output terminal is electrically connected described battery charger;
Second switch, its input end and control end receive described second source signal, and its output terminal is electrically connected described battery charger; And
Phase inverter, its input end receives described second source signal, and its output terminal is electrically connected the described control end of described first switch.
3. commutation circuit as claimed in claim 1, it is characterized in that, described commutation circuit also comprises:
2nd USB charging specification detection chip, detects the type of the second USB port, to produce the second testing result signal;
Wherein said usb signal controls to decide to allow described CPU (central processing unit) and described first USB port or described second USB port carry out data transmission according to described first testing result signal, described second testing result signal, described first power supply signal and described second source signal with commutation circuit; Described selector switch the 3rd power supply signal of described first power supply signal, described second source signal and described second USB port is provided one of them to described battery charger; And described charging current control circuit produces described current controling signal according to described first power supply signal, described second source signal, described 3rd power supply signal, described first testing result signal and described second testing result signal.
4. an electronic installation, is characterized in that, described electronic installation comprises:
First USB port;
Second USB port;
Power input port;
CPU (central processing unit);
Battery charger; And
Commutation circuit, realizes based on hardware, comprising:
First USB (universal serial bus) (USB) is charged specification detection chip, is electrically connected described first USB port, detects the type of described first USB port, to produce the first testing result signal;
Usb signal controls and commutation circuit, be electrically connected a described USB charging specification detection chip, described first USB port, described second USB port and described CPU (central processing unit), be controlled by described first testing result signal, to determine to allow described CPU (central processing unit) and described first USB port or described second USB port carry out data transmission;
Selector switch, is electrically connected described first USB port, described power input port and described battery charger, provides one of them device that charges the battery of the first power supply signal of described first USB port and the second source signal of described power input port; And
Charging current control circuit, be electrically connected described first USB port, described power input port, described battery charger and a described USB to charge specification detection chip, adjust according to described first power supply signal, described second source signal and described first testing result signal generation current control signal the electric current that described battery charger charges to battery;
A wherein said USB charging specification detection chip produces described first testing result signal by two data-signals coming from described first USB port; Described usb signal controls to decide to allow described CPU (central processing unit) and described first USB port or described second USB port carry out data transmission according to described first testing result signal, described first power supply signal and described second source signal with commutation circuit; And described selector switch decides described first power supply signal and described second source signal one of them to be supplied to described battery charger according to the logic level of described first power supply signal and the logic level of described second source signal.
5. electronic installation as claimed in claim 4, it is characterized in that, wherein said selector switch comprises:
First switch, its input end and control end are electrically connected described first USB port to receive described first power supply signal, and its output terminal is electrically connected described battery charger;
Second switch, its input end and control end are electrically connected described power input port to receive described second source signal, and its output terminal is electrically connected described battery charger; And
Phase inverter, its input end is electrically connected described power input port to receive described second source signal, and its output terminal is electrically connected the described control end of described first switch.
6. electronic installation as claimed in claim 4, it is characterized in that, described commutation circuit also comprises:
2nd USB charging specification detection chip, is electrically connected described second USB port, detects the type of the second USB port, to produce the second testing result signal;
Wherein said usb signal controls to be electrically connected with commutation circuit described 2nd USB and to charge specification detection chip, decides to allow described CPU (central processing unit) and described first USB port or described second USB port carry out data transmission according to described first testing result signal, described second testing result signal, described first power supply signal and described second source signal; Described selector switch is also electrically connected described second USB port, and one of them providing one the 3rd power supply signal of described first power supply signal, described second source signal and described second USB port is to described battery charger; And described charging current control circuit is more electrically connected described 2nd USB charging specification detection chip, produces described current controling signal according to described first power supply signal, described second source signal, described 3rd power supply signal, described first testing result signal and described second testing result signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520754342.2U CN205015885U (en) | 2015-09-25 | 2015-09-25 | Switching circuit and electron device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520754342.2U CN205015885U (en) | 2015-09-25 | 2015-09-25 | Switching circuit and electron device |
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| CN205015885U true CN205015885U (en) | 2016-02-03 |
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| CN201520754342.2U Active CN205015885U (en) | 2015-09-25 | 2015-09-25 | Switching circuit and electron device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655316A (en) * | 2016-09-21 | 2017-05-10 | 奇酷互联网络科技（深圳）有限公司 | Charging circuit and terminal equipment |
| CN107436853A (en) * | 2016-05-28 | 2017-12-05 | 深圳市京泉华科技股份有限公司 | The control method of USB Type C/PD connectors |
| CN107436571A (en) * | 2016-05-28 | 2017-12-05 | 深圳市京泉华科技股份有限公司 | USB Type C/PD connectors |
| CN108491342A (en) * | 2018-02-08 | 2018-09-04 | 青岛海信移动通信技术股份有限公司 | A kind of method and terminal carrying out access switching |
-
2015
- 2015-09-25 CN CN201520754342.2U patent/CN205015885U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436853A (en) * | 2016-05-28 | 2017-12-05 | 深圳市京泉华科技股份有限公司 | The control method of USB Type C/PD connectors |
| CN107436571A (en) * | 2016-05-28 | 2017-12-05 | 深圳市京泉华科技股份有限公司 | USB Type C/PD connectors |
| CN107436571B (en) * | 2016-05-28 | 2020-05-08 | 深圳市京泉华科技股份有限公司 | USB Type-C/PD connector |
| CN107436853B (en) * | 2016-05-28 | 2020-06-19 | 深圳市京泉华科技股份有限公司 | Control method of USB Type-C/PD connector |
| CN106655316A (en) * | 2016-09-21 | 2017-05-10 | 奇酷互联网络科技（深圳）有限公司 | Charging circuit and terminal equipment |
| CN106655316B (en) * | 2016-09-21 | 2020-05-12 | 奇酷互联网络科技（深圳）有限公司 | Charging circuit and terminal device |
| CN108491342A (en) * | 2018-02-08 | 2018-09-04 | 青岛海信移动通信技术股份有限公司 | A kind of method and terminal carrying out access switching |
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