CN207098741U - A kind of dual power supply switching circuit - Google Patents
A kind of dual power supply switching circuit Download PDFInfo
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- CN207098741U CN207098741U CN201720480189.8U CN201720480189U CN207098741U CN 207098741 U CN207098741 U CN 207098741U CN 201720480189 U CN201720480189 U CN 201720480189U CN 207098741 U CN207098741 U CN 207098741U
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- power supply
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Abstract
The utility model discloses a kind of dual power supply switching circuit.The dual power supply switching circuit includes：Main power supply circuit, the power supply from main power source or stand-by power supply is converted into power unit electricity consumption level, powered to power unit；Control module, it detects the state of main power source and stand-by power supply, and controls the main power supply circuit based on testing result come from main power source or stand-by power supply progress power unit power supply；And auxiliary power supply circuit, the power supply from main power source or stand-by power supply is converted to control module power supply electrical level by it, is powered to the control module.Dual power supply switching circuit of the present utility model is directly powered using auxiliary power supply circuit to control module, and auxiliary power supply circuit is powered according to power conditions from main power source or stand-by power supply to control module.In the utility model, the level of main power supply circuit output is not powered to control module, this avoid closed-loop control is formed, so as to have higher antijamming capability.
Description
Technical field
Electronic technology field is the utility model is related to, more particularly to a kind of dual power supply switching circuit.
Background technology
In the prior art, usual power circuit uses closed loop design mode.The logic level of such a circuit is closed loop control
System, i.e. logic chip control MOS switching switches enter line level switching to power supply, and the level after switching is after rear class DC/DC conversion
It is supplied to logic chip to power, forms closed control circuit.If because the reasons such as electromagnetic interference cause the electricity in a certain link
Clear existing disturbance, then the logic chip is likely to occur exception, and then MOS switching switchs may be caused abnormal, thus makes
The power supply that must be exported is abnormal, causes the abnormal electrical power supply to logic chip, this may aggravate the exception of logic chip again.From
And after initial level Eliminating disturbance, whole power circuit may be still or in abnormality.
Utility model content
The purpose of this utility model is to provide a kind of dual power supply switching circuit to improve antijamming capability.
To achieve the above object, the utility model provides a kind of dual power supply switching circuit.The dual power supply switching circuit bag
Include：
Main power supply circuit, the power supply from main power source or stand-by power supply is converted into power unit electricity consumption level, to electricity consumption
Unit is powered；
Control module, it detects the state of main power source and stand-by power supply, and controls the main power supply based on testing result
Circuit selects main power source or the stand-by power supply to carry out power unit power supply；And
Auxiliary power supply circuit, the power supply from main power source or stand-by power supply is converted to control module power supply electrical level by it, to
The control module power supply.
Preferably, the stand-by power supply power supply circuit in the auxiliary power supply circuit includes low pressure difference linear voltage regulator, described
The input of low pressure difference linear voltage regulator is connected with stand-by power supply, the output end and control module of the low pressure difference linear voltage regulator
Connection.
Preferably, the main power source power supply circuit in the auxiliary power supply circuit includes resistor voltage divider circuit, the resistance point
The input of volt circuit is connected with main power source, and the output end of the resistor voltage divider circuit is connected with the control module.
Preferably, the output voltage of the main power source power supply circuit in the auxiliary power supply circuit is higher than auxiliary power supply electricity
The output voltage of stand-by power supply power supply circuit in road.
Preferably, the first diode is provided between the output end of the main power source power supply circuit and the control module,
The second diode is provided between the output end and the control module of the stand-by power supply power supply circuit.
Preferably, second diode is diode with low power consumption.
Preferably, the dual power supply switching circuit further comprises rear class power module, and the rear class power module is set
Between the output end of the main power supply circuit and power unit.It is further preferred that described in the rear class power module detection
The output level of main power supply circuit, and according to this level in the different DC/DC modules in equipment rear class power module electricity or
Lower electricity.
Preferably, the control module is that two-output impulse generator compares selector chip, and the input of its two-way respectively lead by detection
The state of power supply and stand-by power supply, two-way export the first MOS level conversion units and second for controlling main power supply circuit respectively
MOS level conversion units, wherein, the power supply from main power source is converted to power unit electricity consumption by the first MOS level conversion units
Power supply from stand-by power supply is converted to power unit electricity consumption level by level, the 2nd MOS level conversion units.
The utility model also provides a kind of electronic equipment, and the electronic equipment includes power supply and power unit, the power supply
It is dual power supply switching circuit as described above.
Dual power supply switching circuit of the present utility model is directly powered using auxiliary power supply circuit to control module, auxiliary
Power supply circuit is powered according to power conditions from main power source or stand-by power supply to control module.In the utility model, main power supply
The level of circuit output is not powered to control module, this avoid closed-loop control is formed, so as to be done with higher resisting
Disturb ability.
Brief description of the drawings
Fig. 1 is the schematic diagram according to the dual power supply switching circuit of the utility model first embodiment.
Fig. 2 is the schematic diagram according to the dual power supply switching circuit of the utility model second embodiment.
Fig. 3 is the schematic diagram of auxiliary power supply circuit.
Embodiment
In the accompanying drawings, represent same or similar element using same or similar label or there is same or like function
Element.Embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the schematic diagram according to the dual power supply switching circuit of the utility model first embodiment.For pair shown in Fig. 1
Power supply switch circuit includes：Main power supply circuit, control module, and auxiliary power supply circuit.Dotted line in Fig. 1 represents detection signal
Circuit or control signal lines, solid line represent supply line.
Power supply from main power source or stand-by power supply is converted to use by the main power supply circuit under the control of control module
Electric unit electricity consumption level, powered to power unit.That is, main power supply circuit selects main power source under the control of control module
Or stand-by power supply is as currently practical power supply.The particular circuit configurations of main power supply circuit can be arranged as required to, can be with
Using any appropriate DC/DC circuits or AC/DC circuits in the prior art.It is pointed out that in this patent, electricity consumption list
Member does not include the control module.In addition, the main power supply circuit is optionally by the confession from main power source or stand-by power supply
Electricity is converted to power unit electricity consumption level, is powered to power unit.Advantageously, preferentially using main power source (such as USB powers)
Powered to power unit.
The state of control module detection main power source and stand-by power supply, and the main power supply is controlled based on testing result
Circuit selects main power source or the stand-by power supply to carry out power unit power supply.For example, preferentially it is powered using main power source.Described
Main power source is mains-supplied (such as USB power supplies), in the case that the stand-by power supply is battery powered, preferentially using mains-supplied.
So as to it improve the service life of battery.The particular circuit configurations of control module can be arranged as required to, as long as can detect double
The state of power supply simultaneously controls main power supply circuit to select appropriate power supply.That is, in the presence of two power supplys are equal, USB 5V
Priority task, BAT 6V do not work, and avoid the formation of battery loss.
Power supply from main power source or stand-by power supply is converted to control module power supply electrical level by the auxiliary power supply circuit.It is auxiliary
Helping the particular circuit configurations of power supply circuit can be arranged as required to, and can use any appropriate DC/DC electricity in the prior art
Road, AC/DC circuits or low pressure difference linear voltage regulator.
Dual power supply switching circuit of the present utility model is directly powered using auxiliary power supply circuit to control module, is avoided
The power supply circuit for the control module being controlled to main power supply circuit forms closed-loop control, so as to have higher anti-interference energy
Power.Dual power supply switching circuit of the present utility model can realize dual power supply seamless switching, and be disturbed with preferable anti-ESD, anti-EFT
The circuit of ability, it is highly suitable in consumer level low-tension supply product.More specifically, when having external interference (ESD, EFT), electricity
Source circuit being capable of normal work.
Fig. 2 is the schematic diagram according to the dual power supply switching circuit of the utility model second embodiment.In Fig. 2, mould is controlled
Block is compares selector, more specifically, comparing selector chip for two-output impulse generator.The two-output impulse generator compares selection
The two-way input of device chip detects the state of main power source and stand-by power supply, such as the power supply of detection main power source and stand-by power supply respectively
Level.When power supply electrical level is higher than given threshold, judge that main power source or stand-by power supply power supply are normal.The two-output impulse generator ratio
Two-way output compared with selector chip controls the first MOS level conversion units (the MOS level in Fig. 2 of main power supply circuit respectively
1) and the 2nd MOS level conversion units (MOS level switching 2) in Fig. 2 switching.First MOS level conversion units are autonomous in the future
The power supply of power supply is converted to power unit electricity consumption level, and the 2nd MOS level conversion units change the power supply from stand-by power supply
For power unit electricity consumption level.It is understood that the first MOS level conversion units and the 2nd MOS level conversion units are main
Formed using metal-oxide-semiconductor, but the physical circuit of the first MOS level conversion units and the 2nd MOS level conversion units construction can
To be arranged as required to.
In one embodiment, it is a programmable logic chip to compare selector.The chip is that 2 tunnels input (A, B) two
Road exports (C, D), and a datum, such as 1.5V are set inside comparator, and input pin is respectively USB 5V detections and battery
Level detection.Set by program, in the presence of USB 5V, A pins incoming level is more than datum, then exports high electricity in C
Flat, D outputs are low level；Only battery level when, A pin incoming levels are zero, then C export low level, D output high level.
Referring specifically to following table.
Table 1
In another embodiment, it is a hardware circuit to compare selector.In the case, above-mentioned datum can
To be inputted by external level to set.
Two MOS level conversion units, which are respectively completed, in Fig. 2 is converted into Vo1 by USB 5V and changes backup battery voltage
For Vo1.Two converting units are controlled by the output pin C and D that compare selector, and the two is reverse level；A and B is respectively to supervise
Level is surveyed, main power source is monitored or reserve battery is online, and export C and D state.The power supply of control module is VDD.
PGOOD level is used to the actual power voltage or voltage signal of main power source being delivered to rear class power module, with right as needed
Vo1 carries out further transformation adjustment.
Stand-by power supply power supply circuit in auxiliary power supply circuit is supplied using the stand-by power supply of battery etc. to control module
Electricity, for example, being that 3.3V powers to control module by the 6V voltage conversions of battery.It is standby in the auxiliary power supply circuit referring to Fig. 3
Voltage conversion is carried out using low pressure difference linear voltage regulator UV2 with power-supplying circuit.That is, in the auxiliary power supply circuit
Stand-by power supply power supply circuit include low pressure difference linear voltage regulator, input (i.e. Fig. 2 of the low pressure difference linear voltage regulator UV2
Middle UV2 upper left side ports " IN ") it is connected with stand-by power supply, the output end of the low pressure difference linear voltage regulator (i.e. UV2 in Fig. 2
Upper right side ports " OUT ") be connected with control module.
For example, low pressure difference linear voltage regulator (the LDO：Low Dropout Regulator) by the 6V of stand-by power supply
(BAT 6V) is converted to 3.3V.As shown in figure 3, as needed, the stand-by power supply power supply circuit in the auxiliary power supply circuit
In be additionally provided with the electronic devices such as electric capacity CV17, CV16, CV14, CV15, resistance R34 5.The The concrete specification of such electronic device
It can be arranged as required to parameter.Power consumption is advantageously reduced using low pressure difference linear voltage regulator, especially relative to resistance point
For volt circuit, the power of consumption substantially reduces.
Referring to Fig. 3, the main power source power supply circuit in the auxiliary power supply circuit carries out voltage using resistor voltage divider circuit and turned
Change.Specifically, the main power source power supply circuit in the auxiliary power supply circuit includes resistor voltage divider circuit, the electric resistance partial pressure electricity
The input on road is connected with main power source, the output end of the resistor voltage divider circuit (tie point i.e. between series resistance or with institute
State the equipotential point of tie point) it is connected with the control module.So as to which circuit structure is simple, cost is low.In the illustrated embodiment,
Resistor voltage divider circuit includes two individual resistors.But the utility model not limited to this.Moreover, the parameter such as resistance of each resistance
It can be arranged as required to.
Preferably, the output voltage of the main power source power supply circuit in the auxiliary power supply circuit is higher than stand-by power supply power supply electricity
The output voltage on road.So as to which the power supply to the programmable logic chip of control module is preferentially powered using main power source.
Preferably, the first diode is provided between the output end of the main power source power supply circuit and the control module,
The second diode is provided between the output end and the control module of the stand-by power supply power supply circuit.
Preferably, second diode is diode with low power consumption.
Preferably, the dual power supply switching circuit further comprises rear class power module, and the rear class power module is set
Between the output end of main power supply circuit and power unit.It is further preferred that the rear class power module detection power supply is online
Level, and according to this level to electric in the different DC/DC modules in equipment rear class power module or lower electricity.
The utility model also provides a kind of electronic equipment, and the electronic equipment includes power supply and power unit, the power supply
It is dual power supply switching circuit as described above.
4. control module power vd D is designed
It is the actual control module that the circuit normally switches to compare selector, and the module can for two-way input two-way output
Programmed logic chip, VDD are the module for power supply power supply, it is necessary to meet：
Meet two normal handoff functionalities of power supply, and Pgood level state can not be influenceed
Low-power consumption target under power supply or battery status
In the electronic circuit as shown in figure 3, the BAT6V of reserve battery is converted into VDD using UV2 and D2；In addition, use resistance
Bleeder circuit and D1 are converted to VDD.UV2 is LDO, and BAT 6V are converted into LDO 3.3V.D1, D2 are diode, and pressure drop is
0.3V.R346, R347 elect 820 Ω and 2k Ω as so that USB 3.6V are more than LDO3.3V, avoid battery from being constantly in work shape
State.
In the presence of USB 5V and BAT 6V are equal, D1 conductings, D2 ends, and UV2 does not work, and gives logic chip to supply by USB5V
Electricity.When only USB 5V power, BAT6V zero, D1 conducting, D2 cut-offs.When only BAT 6V power, USB 5V are zero, D2 conductings,
D1 ends, and is powered by BAT 6V to logic chip.
It is understood that the parameter of each electric capacity, resistance, diode is not limited to the embodiment of diagram.But can basis
Need to adjust or set.
The utility model uses low power dissipation design, UV2 LDO, 2~3uA of stand-by power consumption, compares selector logic chip U7
Stand-by power consumption is 8uA, and although D2 has pressure drop, but low in energy consumption, amounts to stand-by power consumption ＜ 15uA.Specifically, reserve battery can be treated
Machine 1 year；
It is last it is to be noted that：Above example is only to illustrate the technical solution of the utility model, rather than it is limited
System.It will be understood by those within the art that：Technical scheme described in foregoing embodiments can be modified, or
Person carries out equivalent substitution to which part technical characteristic；These modifications are replaced, and take off the essence of appropriate technical solution
From the spirit and scope of various embodiments of the utility model technical scheme.
Claims (8)
- A kind of 1. dual power supply switching circuit, it is characterised in that including：Main power supply circuit, the power supply from main power source or stand-by power supply is converted into power unit electricity consumption level, to power unit Power supply；Control module, it detects the state of main power source and stand-by power supply, and controls the main power supply circuit based on testing result To select main power source or stand-by power supply to carry out power unit power supply；AndAuxiliary power supply circuit, the power supply from main power source or stand-by power supply is converted to control module power supply electrical level by it, to described Control module is powered.
- 2. dual power supply switching circuit as claimed in claim 1, it is characterised in that the stand-by power supply in the auxiliary power supply circuit Power supply circuit includes low pressure difference linear voltage regulator, and the input of the low pressure difference linear voltage regulator is connected with the stand-by power supply, The output end of the low pressure difference linear voltage regulator is connected with the control module.
- 3. dual power supply switching circuit as claimed in claim 2, it is characterised in that the main power source in the auxiliary power supply circuit supplies Circuit includes resistor voltage divider circuit, and the input of the resistor voltage divider circuit is connected with the main power source, the electric resistance partial pressure The output end of circuit is connected with the control module.
- 4. dual power supply switching circuit as claimed in claim 1, it is characterised in that the main power source in the auxiliary power supply circuit supplies The output voltage of circuit is higher than the output voltage of the stand-by power supply power supply circuit in the auxiliary power supply circuit.
- 5. dual power supply switching circuit as claimed in claim 4, it is characterised in that the output end of the main power source power supply circuit with Be provided with the first diode between the control module, the output end and the control module of the stand-by power supply power supply circuit it Between be provided with the second diode.
- 6. dual power supply switching circuit as claimed in claim 5, it is characterised in that second diode is the pole of low-power consumption two Pipe.
- 7. such as the dual power supply switching circuit any one of claim 1-6, it is characterised in that further comprise rear level power supply Module, the rear class power module are arranged between output end and the power unit of the main power supply circuit.
- 8. such as the dual power supply switching circuit any one of claim 1-6, it is characterised in that the control module is lose-lose Enter dual output and compare selector chip, the input of its two-way detects the state of main power source and stand-by power supply, two-way output difference respectively The first MOS level conversion units and the 2nd MOS level conversion units of main power supply circuit are controlled, wherein, the first MOS level conversions Power supply from main power source is converted to power unit electricity consumption level by unit, and the 2nd MOS level conversion units will come from standby electricity The power supply in source is converted to power unit electricity consumption level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720480189.8U CN207098741U (en) | 2017-05-03 | 2017-05-03 | A kind of dual power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720480189.8U CN207098741U (en) | 2017-05-03 | 2017-05-03 | A kind of dual power supply switching circuit |
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| Publication Number | Publication Date |
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| CN207098741U true CN207098741U (en) | 2018-03-13 |
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| CN201720480189.8U Expired - Fee Related CN207098741U (en) | 2017-05-03 | 2017-05-03 | A kind of dual power supply switching circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494866A (en) * | 2018-10-16 | 2019-03-19 | 江苏万邦微电子有限公司 | A kind of power-supply management system |
| CN110994973A (en) * | 2019-11-08 | 2020-04-10 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN111224657A (en) * | 2019-12-25 | 2020-06-02 | 曙光信息产业(北京)有限公司 | Power supply switching circuit of computer USB port |
| CN111628358A (en) * | 2019-02-27 | 2020-09-04 | 同星科技股份有限公司 | USB expansion device with double power supplies and double power supply method |
| CN113053049A (en) * | 2021-04-02 | 2021-06-29 | 广东电网有限责任公司广州供电局 | Early warning type telegraph pole anti-collision pier and warning method |
| CN113311350A (en) * | 2021-07-28 | 2021-08-27 | 苏州浪潮智能科技有限公司 | BBU power supply online test device, method and server |
| CN113442781A (en) * | 2021-06-25 | 2021-09-28 | 杭州海康机器人技术有限公司 | Battery replacement method, battery replacement station, readable storage medium and electronic device |
| CN114397957A (en) * | 2022-01-15 | 2022-04-26 | 上海列拓科技有限公司 | Low-power-consumption power management circuit for MCU chip, and MCU chip |
| CN115589133A (en) * | 2022-12-12 | 2023-01-10 | 杰夫微电子（四川）有限公司 | Power supply multiplexer and control method thereof |
-
2017
- 2017-05-03 CN CN201720480189.8U patent/CN207098741U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494866A (en) * | 2018-10-16 | 2019-03-19 | 江苏万邦微电子有限公司 | A kind of power-supply management system |
| CN111628358A (en) * | 2019-02-27 | 2020-09-04 | 同星科技股份有限公司 | USB expansion device with double power supplies and double power supply method |
| CN110994973A (en) * | 2019-11-08 | 2020-04-10 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN110994973B (en) * | 2019-11-08 | 2021-08-17 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN111224657A (en) * | 2019-12-25 | 2020-06-02 | 曙光信息产业(北京)有限公司 | Power supply switching circuit of computer USB port |
| CN113053049A (en) * | 2021-04-02 | 2021-06-29 | 广东电网有限责任公司广州供电局 | Early warning type telegraph pole anti-collision pier and warning method |
| CN113442781A (en) * | 2021-06-25 | 2021-09-28 | 杭州海康机器人技术有限公司 | Battery replacement method, battery replacement station, readable storage medium and electronic device |
| CN113311350A (en) * | 2021-07-28 | 2021-08-27 | 苏州浪潮智能科技有限公司 | BBU power supply online test device, method and server |
| CN114397957A (en) * | 2022-01-15 | 2022-04-26 | 上海列拓科技有限公司 | Low-power-consumption power management circuit for MCU chip, and MCU chip |
| CN115589133A (en) * | 2022-12-12 | 2023-01-10 | 杰夫微电子（四川）有限公司 | Power supply multiplexer and control method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180313 |