CN106685063A - Power switching circuit - Google Patents
Power switching circuit Download PDFInfo
- Publication number
- CN106685063A CN106685063A CN201611047574.XA CN201611047574A CN106685063A CN 106685063 A CN106685063 A CN 106685063A CN 201611047574 A CN201611047574 A CN 201611047574A CN 106685063 A CN106685063 A CN 106685063A
- Authority
- CN
- China
- Prior art keywords
- resistance
- connection
- power supply
- circuit
- voltage
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/36—Arrangements using end-cell switching
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a power switching circuit. The power switching circuit comprises an external battery module, an internal battery module, a first voltage detection circuit, a second voltage detection circuit, an input protection circuit, an MCU and a power judging and switching circuit; on one aspect, the MCU is connected with the internal battery module via the first voltage detection circuit; on the other aspect, the MCU is connected with a voltage output end of the input protection circuit via the second voltage detection circuit; a voltage input end of the input protection circuit is connected with the external battery module; a first input end of the power judging and switching circuit is connected with the internal battery module, a second input end of the power judging and switching circuit is connected with the voltage output end of the input protection circuit, and an output end is a system power supply end; and a voltage output end of the MCU is connected with a power supply end of the power judging and switching circuit. The power switching circuit is ever prepared with an internal disposable lithium battery and can be also simultaneously equipped with an external battery, and the power switching circuit can switch a system power supply into a suitable power supply as required, thereby preventing battery capacity shortage from occurring.
Description
Technical field
The present invention relates to intelligent gas meter, in particular it relates to a kind of power supply switch circuit.
Background technology
Most of intelligent gas meters use external dry cell as system power supply in the market, due to the battery of dry cell
Capacity is small and discharge curve is uneven, and various products are very different, and actual available energy ratio is less, it is necessary to regular replacing
Battery.
Also occur in that the intelligent gas meter using built-in disposable lithium ion battery in the market, although disposable lithium from
The nominal capacity of sub- battery than larger, mathematic(al) expectation for gas meter, flow meter life requirements in 10 years enough, but due to disposable lithium
The ion battery time that especially lithium thionyl chloride cell occurs is shorter, adds the various quality problems at the initial stage of appearance, causes
Can producer and user ensure that the service life of 10 years is deposited for the gas meter, flow meter of built-in lithium ion battery under various use environments
There is doubt.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of power supply switch circuit.
According to the power supply switch circuit that the present invention is provided, including the inspection of external cell module, internal battery module, first voltage
Slowdown monitoring circuit, second voltage detection circuit, input protection circuit, MCU and power supply differentiate and switching circuit；
Wherein, on the one hand the MCU detects that circuit connects the internal battery module by first voltage, on the other hand logical
Cross the voltage output end that the second voltage detection circuit connects the input protection circuit；The voltage of the input protection circuit
Input connects the external cell module；
The power supply differentiates and the first input end of switching circuit connects the internal battery module, the connection of the second input
The voltage output end of the input protection circuit, output end is system power supply end；
The voltage output end of the MCU connects the power end of the power supply differentiation and switching circuit.
Preferably, the input protection circuit includes fuse, diode A and two-way TVS pipe；
Wherein, the positive pole of the external cell module connects the positive pole of diode A by fuse, and negative pole is by two-way
The positive pole of TVS pipe connection diode A；
The negative pole of the diode A connects the second input, the second voltage of the power supply differentiation and switching circuit
Detection circuit.
Preferably, the first voltage detection circuit, second voltage detection circuit include resistance R1, triode Q1, resistance
R2, resistance R3, resistance R4, resistance R5 and triode Q2；
Wherein, the voltage detecting of one end connection MCU of the resistance R1 enables output end, other end connecting triode Q1's
Base stage, one end of triode Q1 colelctor electrodes connection resistance R3, one end of the other end connection resistance R2 of resistance R3, triode Q2
Base stage, the emitter stage connection of the other end, triode Q2 of resistance R2 is detected voltage end；
One end of the colelctor electrode connection resistance R4 of triode Q2, the AD conversion input of the other end connection MCU of resistance R4,
One end of resistance R5；The other end of resistance R5, triode Q1 grounded emitters；
The detected voltage end is the voltage output end of input protection circuit or the positive pole of internal battery module.
Preferably, the power supply differentiates and switching circuit includes dpdt relay, resistance R6, resistance R7, electric capacity C1
And diode D1；
Wherein, the switch portion of dpdt relay includes first group of contact, second group of contact and biswitch knife；First group
One end of contact A connection resistance R7 in contact, one end of contact B connection resistance R6, the other end connection MCU's of resistance R6
VCC ends, one end of the first binding post connection electric capacity C1 of biswitch knife；The other end of electric capacity C1, the other end ground connection of resistance R7,
First binding post of biswitch knife is corresponding with first group of contact；
Positive pole, the positive pole of internal battery module of the contact C connection diodes D1 in second group of contact, contact D connections are defeated
Enter the voltage output end of protection circuit, the second binding post connection system feeder ear of biswitch knife；Second wiring of biswitch knife
Post is corresponding with second group of contact；
The control unit connection MCU of the dpdt relay.
Preferably, the dpdt relay is using the DPDT relays with auto-lock function.
Compared with prior art, the present invention has following beneficial effect：
1st, the present invention is while standing internal disposable lithium cell, it is also possible to while external cell is equipped, and can basis
System power supply is switched to suitable power supply by situation, it is to avoid the not enough situation of battery electric quantity；
2nd, the present invention is provided with first voltage detection circuit, second voltage detection circuit, to outside battery module, internal electricity
The voltage condition of pond module is all detected by MCU and can notify user by various modes, is convenient for safeguarding；
3rd, the present invention has taken into account the requirement of low-power consumption and the security requirement of internal/external power simultaneously.
Brief description of the drawings
The detailed description made to non-limiting example with reference to the following drawings by reading, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is structural representation of the invention；
Fig. 2 is the schematic diagram of input protection circuit in the present invention；
Fig. 3 is the schematic diagram of voltage detecting circuit in the present invention；
Fig. 4 is the schematic diagram of power supply differentiation and switching circuit in the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
In the present embodiment, the present invention provide power supply switch circuit, including external cell module, internal battery module,
First voltage detection circuit, second voltage detection circuit, input protection circuit, MCU and power supply differentiate and switching circuit；
Wherein, on the one hand the MCU detects that circuit connects the internal battery module by first voltage, on the other hand logical
Cross the voltage output end that the second voltage detection circuit connects the input protection circuit；The voltage of the input protection circuit
Input connects the external cell module；
The power supply differentiates and the first input end of switching circuit connects the internal battery module, the connection of the second input
The voltage output end of the input protection circuit, output end is system power supply end；
The voltage output end of the MCU connects the power end of the power supply differentiation and switching circuit.
The input protection circuit includes fuse, diode A and two-way TVS pipe；Wherein, the external cell module
Positive pole pass through the positive pole that fuse connects diode A, the positive pole that negative pole passes through two-way TVS pipe connection diode A；
The negative pole of the diode A connects the second input, the second voltage of the power supply differentiation and switching circuit
Detection circuit.
In the present embodiment, using outside dry cell, internal battery module is using internal lithium battery for external cell module.
As shown in Fig. 2 input protection circuit, for protecting internal circuit not by overvoltage, the destruction of back-pressure, in the dry electricity in outside
Pond is loaded after gas meter, flow meter by battery case, there is the possibility of cell reverse arranging, so being realized by a powerful diode A
The effect of back-pressure is prevented, the fuse fuse of another quick fuse and a powerful two-way TVS pipe are used as overvoltage
(high pressure) is protected, the energy quick fuse fuse when input has continuous high-pressure, protects internal circuit, prevents malice broken
It is bad.
The first voltage detection circuit, second voltage detection circuit include resistance R1, triode Q1, resistance R2, resistance
R3, resistance R4, resistance R5 and triode Q2；Wherein, the voltage detecting of one end connection MCU of the resistance R1 enables output
End, the base stage of other end connecting triode Q1, one end of triode Q1 colelctor electrodes connection resistance R3, the other end connection of resistance R3
One end of resistance R2, the base stage of triode Q2, the emitter stage connection of the other end, triode Q2 of resistance R2 are detected voltage end；
One end of the colelctor electrode connection resistance R4 of triode Q2, the AD conversion input of the other end connection MCU of resistance R4, resistance R5
One end；The other end of resistance R5, triode Q1 grounded emitters；The detected voltage end is defeated for the voltage of input protection circuit
Go out the positive pole of end or internal battery module.
As shown in figure 3, it is exactly outside dry cell or internal lithium battery, wherein triode Q1 and triode to be detected voltage
Q2 constitutes a controlled switch, and voltage detecting is enabled and sent by MCU, and when for high level, triode Q1 conductings cause three poles
Pipe Q2 also saturation conductions, R4 and R5 composition bleeder circuits, the magnitude of voltage after partial pressure enters the A/D conversion inputs of MCU, by MCU
Calculating obtain the voltage of current detected power supply.Wherein triode Q1 can be NPN triode or N-MOS pipes, triode
Q2 can be PNP triode or P-MOS pipes.The use of the benefit of this controlled switch is that electric current can be avoided when sampling
Consumption.
The power supply differentiates and switching circuit includes dpdt relay, resistance R6, resistance R7, electric capacity C1 and two poles
Pipe D1；Wherein, the switch portion of dpdt relay includes first group of contact, second group of contact and biswitch knife；First group is touched
One end of contact A connection resistance R7 in point, one end of contact B connection resistance R6, the other end of resistance R6 connects the VCC of MCU
End, one end of the first binding post connection electric capacity C1 of biswitch knife；The other end of electric capacity C1, the other end ground connection of resistance R7 are double
First binding post of switch cutter is corresponding with first group of contact；
Positive pole, the positive pole of internal battery module of the contact C connection diodes D1 in second group of contact, contact D connections are defeated
Enter the voltage output end of protection circuit, the second binding post connection system feeder ear of biswitch knife；Second wiring of biswitch knife
Post is corresponding with second group of contact；
The control unit connection MCU of the dpdt relay.The dpdt relay is using with auto-lock function
DPDT relays.
As shown in figure 4, the Vcc in figure is the voltage of MCU system, DPDT is the relay of DPDT, due to intelligent combustion
The energy saving requirement of gas meter, this DPDT relay needs auto-lock function or makes magnetic keep function, can be in relay
Coil on plus carrying out adhesive or the action of opening after suitable voltage, and keep it when coil voltage is removed
State does not change, and the control coil of its relay is by MCU controls.Due in the usage cycles of intelligent gas meter the overwhelming majority when
Between this relay coil no power, in order to the interference for preventing possible strong vibration and high-intensity magnetic field causes relay contacts not received
The upset of control, so the one of which contact of this relay, the contact position for detecting relay can be according to relay
Level in the detection of position is currently which power supply is connected to system power supply to differentiate.Another group of contact be used to switching external power source or
Internal electric source determines that inside and outside which power supply meets the requirement of system power supply and passes through as system power supply by voltage detecting circuit
The control of MCU switches.D1 in figure is used to provide an accessory power supply, for ensureing that relay is in controlled use external electrical
Source or it is uncontrolled use external power source as in the state of system power supply simultaneously external power source do not have it is ready in the case of,
System is unlikely to out of hand, while the characteristic of diode ensure that internal lithium battery avoids the danger of reverse charging.
Specific embodiment of the invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make various deformations or amendments, this not shadow
Sound substance of the invention.
Claims (5)
1. a kind of power supply switch circuit, it is characterised in that including external cell module, internal battery module, first voltage detection
Circuit, second voltage detection circuit, input protection circuit, MCU and power supply differentiate and switching circuit；
Wherein, on the one hand the MCU detects that circuit connects the internal battery module by first voltage, on the other hand by institute
State the voltage output end that second voltage detection circuit connects the input protection circuit；The control source of the input protection circuit
The end connection external cell module；
The power supply differentiates and the first input end of switching circuit connects the internal battery module, and the connection of the second input is described
The voltage output end of input protection circuit, output end is system power supply end；
The voltage output end of the MCU connects the power end of the power supply differentiation and switching circuit.
2. power supply switch circuit according to claim 1, it is characterised in that the input protection circuit include fuse,
Diode A and two-way TVS pipe；
Wherein, the positive pole of the external cell module connects the positive pole of diode A by fuse, and negative pole is by two-way TVS pipe
The positive pole of connection diode A；
The negative pole of the diode A connects the power supply differentiation and the second input, the second voltage detection of switching circuit
Circuit.
3. power supply switch circuit according to claim 1, it is characterised in that the first voltage detection circuit, the second electricity
Pressure detection circuit includes resistance R1, triode Q1, resistance R2, resistance R3, resistance R4, resistance R5 and triode Q2；
Wherein, the voltage detecting of one end connection MCU of the resistance R1 enables output end, the base of other end connecting triode Q1
Pole, one end of triode Q1 colelctor electrodes connection resistance R3, one end, the base of triode Q2 of the other end connection resistance R2 of resistance R3
Pole, the emitter stage connection of the other end, triode Q2 of resistance R2 is detected voltage end；
One end of the colelctor electrode connection resistance R4 of triode Q2, the other end of resistance R4 connects AD conversion input, the resistance of MCU
One end of R5；The other end of resistance R5, triode Q1 grounded emitters；
The detected voltage end is the voltage output end of input protection circuit or the positive pole of internal battery module.
4. power supply switch circuit according to claim 1, it is characterised in that the power supply differentiates and switching circuit include it is double
Dpdt double-pole double-throw (DPDT) relay, resistance R6, resistance R7, electric capacity C1 and diode D1；
Wherein, the switch portion of dpdt relay includes first group of contact, second group of contact and biswitch knife；First group of contact
In contact A connection resistance R7 one end, one end of contact B connection resistance R6, the other end of resistance R6 connects the VCC ends of MCU,
One end of the first binding post connection electric capacity C1 of biswitch knife；The other end of electric capacity C1, the other end ground connection of resistance R7, biswitch
First binding post of knife is corresponding with first group of contact；
Positive pole, the positive pole of internal battery module of the contact C connection diodes D1 in second group of contact, contact D connection inputs are protected
The voltage output end of protection circuit, the second binding post connection system feeder ear of biswitch knife；Second binding post of biswitch knife with
Second group of contact is corresponding；
The control unit connection MCU of the dpdt relay.
5. power supply switch circuit according to claim 4, it is characterised in that the dpdt relay using have from
The DPDT relays of lock function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611047574.XA CN106685063B (en) | 2016-11-22 | 2016-11-22 | Power supply switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611047574.XA CN106685063B (en) | 2016-11-22 | 2016-11-22 | Power supply switch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106685063A true CN106685063A (en) | 2017-05-17 |
| CN106685063B CN106685063B (en) | 2019-01-29 |
Family
ID=58866752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611047574.XA Active CN106685063B (en) | 2016-11-22 | 2016-11-22 | Power supply switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106685063B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107368759A (en) * | 2017-08-31 | 2017-11-21 | 中惠创智无线供电技术有限公司 | A kind of equipment detatching-proof system |
| CN108551157A (en) * | 2018-06-29 | 2018-09-18 | 宁波光舟通信技术有限公司 | A kind of power conversion module |
| CN108631289A (en) * | 2018-08-24 | 2018-10-09 | 广东好太太科技集团股份有限公司 | A kind of power input protection circuit of intelligent door lock |
| CN108879892A (en) * | 2018-09-20 | 2018-11-23 | 山东思科赛德矿业安全工程有限公司 | A kind of double cell group automatic switchover power supply system |
| CN109638956A (en) * | 2018-12-28 | 2019-04-16 | 南京奥视威电子科技股份有限公司 | Power supply switch circuit |
| CN109787349A (en) * | 2019-03-01 | 2019-05-21 | 普联技术有限公司 | A kind of UPS circuit, power circuit and electronic equipment |
| CN110285552A (en) * | 2019-07-01 | 2019-09-27 | 珠海格力电器股份有限公司 | Line controller power supply control circuit, air conditioner internal unit and air conditioning system |
| CN110323830A (en) * | 2019-07-19 | 2019-10-11 | 珠海格力电器股份有限公司 | power supply switching method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998001928A1 (en) * | 1996-07-09 | 1998-01-15 | Smith Jerry R | Electromechanical switching device |
| CN201903927U (en) * | 2010-12-28 | 2011-07-20 | 郑州创源智能设备有限公司 | Wireless remote transmission IC card intelligent gas meter |
| CN104638757A (en) * | 2015-02-03 | 2015-05-20 | 成都秦川科技发展有限公司 | Double-power-supply power supplying circuit of remote control intelligent gas meter |
| CN204791293U (en) * | 2015-07-16 | 2015-11-18 | 郑州创源智能设备有限公司 | Safety cut -off type photoelectric direct reading thing networking gas table |
-
2016
- 2016-11-22 CN CN201611047574.XA patent/CN106685063B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998001928A1 (en) * | 1996-07-09 | 1998-01-15 | Smith Jerry R | Electromechanical switching device |
| CN201903927U (en) * | 2010-12-28 | 2011-07-20 | 郑州创源智能设备有限公司 | Wireless remote transmission IC card intelligent gas meter |
| CN104638757A (en) * | 2015-02-03 | 2015-05-20 | 成都秦川科技发展有限公司 | Double-power-supply power supplying circuit of remote control intelligent gas meter |
| CN204791293U (en) * | 2015-07-16 | 2015-11-18 | 郑州创源智能设备有限公司 | Safety cut -off type photoelectric direct reading thing networking gas table |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107368759A (en) * | 2017-08-31 | 2017-11-21 | 中惠创智无线供电技术有限公司 | A kind of equipment detatching-proof system |
| CN107368759B (en) * | 2017-08-31 | 2023-07-18 | 中惠创智（深圳）无线供电技术有限公司 | Equipment anti-disassembly system |
| CN108551157A (en) * | 2018-06-29 | 2018-09-18 | 宁波光舟通信技术有限公司 | A kind of power conversion module |
| CN108631289A (en) * | 2018-08-24 | 2018-10-09 | 广东好太太科技集团股份有限公司 | A kind of power input protection circuit of intelligent door lock |
| CN108879892A (en) * | 2018-09-20 | 2018-11-23 | 山东思科赛德矿业安全工程有限公司 | A kind of double cell group automatic switchover power supply system |
| CN108879892B (en) * | 2018-09-20 | 2024-04-19 | 山东思科赛德矿业安全工程有限公司 | Automatic switching power supply system for double battery packs |
| CN109638956A (en) * | 2018-12-28 | 2019-04-16 | 南京奥视威电子科技股份有限公司 | Power supply switch circuit |
| CN109638956B (en) * | 2018-12-28 | 2024-02-23 | 南京奥视威电子科技股份有限公司 | Power supply switching circuit |
| CN109787349A (en) * | 2019-03-01 | 2019-05-21 | 普联技术有限公司 | A kind of UPS circuit, power circuit and electronic equipment |
| CN110285552A (en) * | 2019-07-01 | 2019-09-27 | 珠海格力电器股份有限公司 | Line controller power supply control circuit, air conditioner internal unit and air conditioning system |
| CN110323830A (en) * | 2019-07-19 | 2019-10-11 | 珠海格力电器股份有限公司 | power supply switching method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106685063B (en) | 2019-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106685063A (en) | Power switching circuit | |
| CN203135543U (en) | Cell phone adapter | |
| CN205787042U (en) | Battery power detection circuit and battery power detection system | |
| CA2430085A1 (en) | Automatic detecting and switching vehicle charger | |
| CN108767946A (en) | A kind of wake-up circuit and battery management system | |
| CN106059048A (en) | Electric connection accessory with direct current portable power source protection and instantaneous high-power output | |
| CN104242252B (en) | Battery over-discharge protection circuit | |
| CN208001152U (en) | Battery protection device and load device | |
| CN206725642U (en) | insulator leakage current on-line monitoring system | |
| CN203522239U (en) | Battery device with zero standby power consumption | |
| CN205846840U (en) | Electric connection accessory with direct current portable power source protection and instantaneous high-power output | |
| CN206498211U (en) | A kind of battery control circuit | |
| CN205847076U (en) | AC D/C power | |
| CN207879079U (en) | A kind of smart lock and the Double-battery powered control system for smart lock | |
| CN104638757B (en) | Double-power-supply power supplying circuit of remote control intelligent gas meter | |
| CN207977724U (en) | A kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder | |
| CN204166063U (en) | A kind of lithium battery group fender pick-up unit | |
| CN104600763A (en) | Under-voltage protection circuit and lamp | |
| CN208461499U (en) | A kind of battery charger | |
| CN206178103U (en) | Energy storage system contactor adhesion detection device | |
| CN207586342U (en) | A kind of electrical load detection of electrical leakage warning circuit | |
| CN206922502U (en) | Power-down protection control circuit and electronic equipment | |
| CN109327061A (en) | A kind of battery feed circuit | |
| CN209265308U (en) | A kind of lithium battery group electric current output system based on Bluetooth of mobile phone control | |
| CN205139336U (en) | Power detection circuit and gas -cooker |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |