CN208754183U - Power circuit and its indoor display unit based on MicroUSB power supply - Google Patents
Power circuit and its indoor display unit based on MicroUSB power supply Download PDFInfo
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- CN208754183U CN208754183U CN201821683071.6U CN201821683071U CN208754183U CN 208754183 U CN208754183 U CN 208754183U CN 201821683071 U CN201821683071 U CN 201821683071U CN 208754183 U CN208754183 U CN 208754183U
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Abstract
The utility model discloses a kind of power circuits based on MicroUSB power supply, including MicroUSB master interface circuit, accessory power supply, main power conversion circuit, auxiliary power conversion circuit and auxiliary power start circuit；MicroUSB master interface circuit connection MicroUSB interface simultaneously obtains external power supply power supply；External power supply power supply is converted to stable power supply signal and exported by main power conversion circuit, and power supply signal is also output to auxiliary power start circuit；Accessory power supply provides accessory power supply；Accessory power supply is converted to stable power supply signal and output by auxiliary power conversion circuit；Auxiliary power start circuit providing drive signals drive auxiliary power conversion circuit work.The utility model additionally provides the indoor display unit of the power circuit including powering based on MicroUSB.The utility model realizes low-voltage power supply and low pressure electricity consumption, ensure that the safety utilization of electric power of equipment, and circuit is simple and reliable, low in cost.
Description
Technical field
The utility model is more particularly to a kind of power circuit and its indoor display unit based on MicroUSB power supply.
Background technique
With the development and the improvement of people's living standards of economic technology, the safety of electronic equipment has been obtained more next
More attention.
Currently, a large amount of electronic equipment is all powered by the way of the input of 220V AC power source, power circuit master
It 220VAC to input as shown in Figure 1: by pressure-sensitive, wire resistor etc. protects device, passes through rectifier bridge, generatrix high pressure；Again
Through switch chip control pulse transformer input, pair side DC voltage 12VDC is generated, generates system power supply using LDO chip
5V.Device used mainly includes rectification bridge chip, switch chip, pulse transformer, LDO chip etc..
But current this 220V AC power source scheme, due to using High Level AC Voltage as original power, so that should
The safety of class of electronic devices is poor, is easy to produce the accidents such as electric leakage, contact；Meanwhile if peace in order to guarantee equipment application
Quan Xing then may require that in a power and all kinds of protection circuits and isolating device be added, this will make the electricity of the class of electronic devices
Source circuit volume is larger, and cost greatly improves.
Utility model content
It is reliable and low-cost based on MicroUSB that one of the purpose of this utility model is to provide a kind of power supply safety
The power circuit of power supply.
The two of the purpose of this utility model are that providing a kind of includes the power circuit based on MicroUSB power supply
Indoor display unit.
This power circuit based on MicroUSB power supply provided by the utility model, including MicroUSB main interface electricity
Road, accessory power supply, main power conversion circuit, auxiliary power conversion circuit and auxiliary power start circuit；MicroUSB main interface
Circuit and main power conversion circuit concatenation, accessory power supply and auxiliary power conversion circuit concatenation；The output of main power conversion circuit
The output end of end and auxiliary power conversion circuit is directly connected to；The output end of main power conversion circuit is also connected with auxiliary power start
The output end of the input terminal of circuit, auxiliary power start circuit connects auxiliary power conversion circuit；MicroUSB master interface circuit
For connecting MicroUSB interface and obtaining external power supply power supply；Main power conversion circuit is used for will be from MicroUSB main interface electricity
The external power supply power supply signal that road obtains is converted to stable power supply signal output, while also exporting the stable power supply signal
To auxiliary power start circuit；Accessory power supply is used to provide accessory power supply in the power-off of MicroUSB master interface circuit；Auxiliary electricity
The electric energy that power-switching circuit provides accessory power supply is converted to stable power supply signal and output；Auxiliary power start circuit is used for
Driving signal driving auxiliary power conversion circuit work is provided in the power-off of MicroUSB master interface circuit.
The accessory power supply is battery.
The main power conversion circuit is the circuit being made of the power supply chip of model SPX1117.
The auxiliary power conversion circuit is the circuit being made of the power supply chip of model SGM6603.
The auxiliary power start circuit include assistant starting input current-limiting resistance, assistant starting input pull down resistor and
Assistant starting switching tube；The output end of main power conversion circuit inputs current-limiting resistance connection auxiliary by the assistant starting of concatenation and opens
The input terminal of dynamic switching tube, the input terminal of assistant starting switching tube also input pull down resistor ground connection by assistant starting, and auxiliary opens
Motion end one end ground connection of dynamic switching tube, the other end are directly connected to the enabled pin of the power supply chip of auxiliary power conversion circuit.
The utility model additionally provides a kind of indoor display unit, the indoor display unit include it is described based on
The power circuit of MicroUSB power supply.
This power circuit and its indoor display unit based on MicroUSB power supply provided by the utility model, passes through
MicroUSB interface or the power supply of auxiliary low pressure DC power supply, realize low-voltage power supply and low pressure electricity consumption, ensure that power supply unit
Safety utilization of electric power, and circuit is simple and reliable, it is low in cost.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing communication power supply circuit.
Fig. 2 is the functional block diagram of the power circuit based on MicroUSB power supply of the utility model.
Fig. 3 is the circuit theory schematic diagram of the MicroUSB master interface circuit of the utility model.
Fig. 4 is the circuit theory schematic diagram of the main power conversion circuit of the utility model.
Fig. 5 is the auxiliary power conversion circuit of the utility model and the circuit theory schematic diagram of auxiliary power start circuit.
Specific embodiment
Be illustrated in figure 2 the functional block diagram of the power circuit based on MicroUSB power supply of the utility model: this is practical
This power circuit based on MicroUSB power supply of novel offer, including MicroUSB master interface circuit, accessory power supply, main electricity
Power-switching circuit, auxiliary power conversion circuit and auxiliary power start circuit；MicroUSB master interface circuit and main power source conversion
Circuit concatenation, accessory power supply and auxiliary power conversion circuit concatenation；The output end and accessory power supply of main power conversion circuit are converted
The output end of circuit is directly connected to；The output end of main power conversion circuit is also connected with the input terminal of auxiliary power start circuit, auxiliary
The output end of power starting circuit is helped to connect auxiliary power conversion circuit；MicroUSB master interface circuit is for connecting MicroUSB
Interface simultaneously obtains external power supply power supply；Main power conversion circuit is used for the external power supply that will be obtained from MicroUSB master interface circuit
Power supply signal is converted to stable power supply signal output, while the stable power supply signal is also output to auxiliary power start electricity
Road；Accessory power supply is used to provide accessory power supply in the power-off of MicroUSB master interface circuit；Auxiliary power conversion circuit will assist
The electric energy that power supply provides is converted to stable power supply signal and output；Auxiliary power start circuit is used in MicroUSB main interface
Driving signal driving auxiliary power conversion circuit work is provided when down circuitry.
It is illustrated in figure 3 the circuit theory schematic diagram of the MicroUSB master interface circuit of the utility model: where
MicroUSB interface is 5 foot interfaces (J3 is indicated in figure), wherein 1 foot is+5V power supply signal, 5 feet are earth signal, and 2 feet and 3 feet are
Data pin；Meanwhile 2 foot and 3 feet connected also by resistance (R25 or R26) required for the communication interface that connects, while respectively
It is also grounded by electrostatic protection diode (ESD1 or ESD2), carries out the electrostatic protection of interface.
Be illustrated in figure 4 the circuit theory schematic diagram of the main power conversion circuit of the utility model: the 5V in figure is
The external 5V power supply signal of MicroUSB master interface circuit output；External 5V power supply signal (is indicated by TVS pipe in figure
TVS001 it after) being protected, then is filtered by capacitor C28, is then input to the power supply chip of main power conversion circuit
1 foot of 3 feet of SPX1117 (U14 is indicated in figure), chip is grounded by diode D15；2 feet and 4 feet of power supply chip are chip
Output pin, directly input+DVCC signal, while also filtering by capacitor C33, it is then (anti-by protection diode D16
Only electric current flow backward) output supplying power for outside 3.3V power supply signal；2 feet of power supply chip and the power supply signal of 4 feet output are with core
The earth signal level of piece is the 3.3V signal of 0V, but since an about 0.7V can be generated there are the protection of diode D16
Pressure drop signal, therefore diode D15 is accessed in the earth signal of power supply chip, so that the earth signal level of power supply chip be raised
About 0.7V, to offset the pressure drop of protection diode D16；Meanwhile diode D15 and D16 require to use same producer, same type
Number and with a batch of diode, guarantee the performance of two diodes as close possible to guarantee the VCC power supply signal of output
It is as far as possible+3.3V.
The circuit theory of the auxiliary power conversion circuit and auxiliary power start circuit that are illustrated in figure 5 the utility model is shown
Be intended to: the BAT in figure is the output end of accessory power supply (battery), and 1 foot is directly grounded, and two feet are power output end and export
VBAT signal；It is defeated by the power supply for being input to power supply chip U7 (model SGM6603) after switch K101 or 0 Europe resistance R8
Enter 6 foot of pin, while the pin is connected to 1 foot of chip also by filter inductance L5；3 feet of chip are enabled pin, are led to
Pull-up resistor R37 connection power supply signal is crossed, while the pin is also directly connected to the output end of auxiliary power start circuit；Power supply core
2 feet of piece are directly grounded, and 5 feet are output end and directly export the power supply signal of supplying power for outside；The power supply signal of supplying power for outside is logical
Cross capacitor C50 and C51 ground connection filtering after, then by protection diode D14 carry out reverse-filling protection after, export final external confession
Electric signal VCC；Meanwhile the power supply signal of power supply chip output also passes through resistance sampling circuit (resistance RF1, RF2 and RF3) progress
Then the out-put supply signal of sampling is fed back to 4 feet of power supply chip, so that it is defeated to complete power supply chip by the sampling of output voltage
The closed-loop control of voltage out.
Auxiliary power start circuit then includes assistant starting input current-limiting resistance R55, assistant starting input pull down resistor R36
With assistant starting switching tube Q3；The output end of main power conversion circuit is connected auxiliary by the assistant starting input current-limiting resistance of concatenation
The input terminal for starting switch pipe is helped, the input terminal of assistant starting switching tube also inputs pull down resistor ground connection by assistant starting, auxiliary
The motion end one end ground connection for starting switch pipe is helped, the other end is directly connected to the enabled of the power supply chip U7 of auxiliary power conversion circuit
Pin (3 foot)；When main power conversion circuit works normally simultaneously out-put supply signal+DVCC, switching tube Q3 is connected at this time, chip
The power pins of U7 are directly grounded and are pulled low to low level, and chip U7 is in off state at this time, accessory power supply and accessory power supply
Conversion circuit does not work.When main power conversion circuit exception, power supply signal+DVCC fails at this time, switching tube Q3 cut-off, this
When chip the enabled pin of U7 the output voltage of battery, i.e. high level are pulled to by resistance R37, power supply chip U7 is enabled at this time
And start to work, accessory power supply and auxiliary power conversion circuit start to replace main power source and main power conversion circuit work simultaneously at this time
Supplying power for outside.
This power circuit based on MicroUSB power supply provided by the present application, can be used for other any need and is powered
Electronic equipment, it is whole including all types of measuring instruments (such as electric energy meter, water meter, gas meter, flow meter, calorimeter etc.), electric energy management
End, distribution terminal, electric energy quality monitoring equipment, grid automation terminal, acquisition terminal, concentrator, data collector, gauge
Table, write by hand device, fault detector etc..
Claims (6)
1. a kind of power circuit based on MicroUSB power supply, it is characterised in that including MicroUSB master interface circuit, auxiliary electricity
Source, main power conversion circuit, auxiliary power conversion circuit and auxiliary power start circuit；MicroUSB master interface circuit and main electricity
Power-switching circuit concatenation, accessory power supply and auxiliary power conversion circuit concatenation；The output end and auxiliary electricity of main power conversion circuit
The output end of power-switching circuit is directly connected to；The output end of main power conversion circuit is also connected with the input of auxiliary power start circuit
The output end at end, auxiliary power start circuit connects auxiliary power conversion circuit；MicroUSB master interface circuit is for connecting
MicroUSB interface simultaneously obtains external power supply power supply；Main power conversion circuit is used to obtain from MicroUSB master interface circuit
External power supply power supply signal is converted to stable power supply signal output, while the stable power supply signal is also output to auxiliary electricity
Source start-up circuit；Accessory power supply is used to provide accessory power supply in the power-off of MicroUSB master interface circuit；Accessory power supply conversion electricity
The electric energy that road provides accessory power supply is converted to stable power supply signal and output；Auxiliary power start circuit is used for
Driving signal driving auxiliary power conversion circuit work is provided when MicroUSB master interface circuit powers off.
2. the power circuit according to claim 1 based on MicroUSB power supply, it is characterised in that the accessory power supply
For battery.
3. the power circuit according to claim 1 or 2 based on MicroUSB power supply, it is characterised in that the main power source
Conversion circuit is the circuit being made of the power supply chip of model SPX1117.
4. the power circuit according to claim 1 or 2 based on MicroUSB power supply, it is characterised in that the auxiliary electricity
Power-switching circuit is the circuit being made of the power supply chip of model SGM6603.
5. the power circuit according to claim 4 based on MicroUSB power supply, it is characterised in that the accessory power supply
Start-up circuit includes assistant starting input current-limiting resistance, assistant starting input pull down resistor and assistant starting switching tube；Main power source
The output end of conversion circuit inputs the input terminal that current-limiting resistance connects assistant starting switching tube, auxiliary by the assistant starting of concatenation
The input terminal for starting switch pipe also inputs pull down resistor ground connection by assistant starting, and the motion end one of assistant starting switching tube terminates
Ground, the other end are directly connected to the enabled pin of the power supply chip of auxiliary power conversion circuit.
6. a kind of indoor display unit, it is characterised in that including what is powered described in one of Claims 1 to 5 based on MicroUSB
Power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821683071.6U CN208754183U (en) | 2018-10-17 | 2018-10-17 | Power circuit and its indoor display unit based on MicroUSB power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821683071.6U CN208754183U (en) | 2018-10-17 | 2018-10-17 | Power circuit and its indoor display unit based on MicroUSB power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208754183U true CN208754183U (en) | 2019-04-16 |
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ID=66085886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821683071.6U Active CN208754183U (en) | 2018-10-17 | 2018-10-17 | Power circuit and its indoor display unit based on MicroUSB power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN208754183U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086142A (en) * | 2019-04-25 | 2019-08-02 | 瑞纳智能设备股份有限公司 | A kind of protective device based on MBUS node cluster |
| CN113655363A (en) * | 2021-09-13 | 2021-11-16 | 东科半导体(安徽)股份有限公司 | On-line testing circuit for conduction voltage drop of main switching tube of switching power supply |
-
2018
- 2018-10-17 CN CN201821683071.6U patent/CN208754183U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086142A (en) * | 2019-04-25 | 2019-08-02 | 瑞纳智能设备股份有限公司 | A kind of protective device based on MBUS node cluster |
| CN113655363A (en) * | 2021-09-13 | 2021-11-16 | 东科半导体(安徽)股份有限公司 | On-line testing circuit for conduction voltage drop of main switching tube of switching power supply |
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