CN111817425A - Automatic switching circuit of low-voltage apparatus stand-by power supply - Google Patents
Automatic switching circuit of low-voltage apparatus stand-by power supply Download PDFInfo
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- CN111817425A CN111817425A CN201910294609.7A CN201910294609A CN111817425A CN 111817425 A CN111817425 A CN 111817425A CN 201910294609 A CN201910294609 A CN 201910294609A CN 111817425 A CN111817425 A CN 111817425A
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- power supply
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- automatic switching
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- 239000003990 capacitor Substances 0.000 claims description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention relates to an automatic switching circuit of a standby power supply of a low-voltage apparatus, which is used for realizing automatic switching between a common power supply and the standby power supply of the low-voltage apparatus, wherein the power supply output end of the circuit is connected with the low-voltage apparatus and comprises a voltage dividing sub-circuit and a switch sub-circuit, the switch sub-circuit comprises an MOS (metal oxide semiconductor) tube, the source electrode of the MOS tube is connected with the standby power supply, the grid electrode of the MOS tube is connected with the voltage dividing sub-circuit, the drain electrode of the MOS tube is connected with the power supply output end, and the common power supply is. Compared with the prior art, the invention has the advantages of automatic switching without power failure, low energy consumption and the like.
Description
Technical Field
The invention relates to the field of power supply switching, in particular to an automatic switching circuit of a standby power supply of a low-voltage apparatus.
Background
The power supply switching application is very wide, and power supply switching circuits are arranged in a power grid networking mode, a power distribution cabinet power distribution mode, a household standby generator switching mode and the like.
In a low-voltage circuit, a dual-switching contact relay can realize the switching of dual power supplies, and the principle is as follows: when the A path of power supply is disconnected, the relay is positioned as shown in figure 1, and the B path of power supply supplies power to the electric appliance; when the A path is electrified, the relay coil attracts the switch, and the A path power supply is switched on to supply power to the electrical appliance. The relay needs time in disconnection and contact, a short power-off phenomenon can occur, the relay coil needs energy to maintain pull-in current when pull-in is performed, and energy consumption of a system can be increased in power supply.
In summary, the conversion circuit of the existing low-voltage apparatus has the following defects:
1) when the relay is switched between the common standby mode and the standby mode, the short-time power failure can be caused, if the power of the rear stage is large, the short-time power failure can have large influence on the rear stage, so that a large-capacity energy storage capacitor needs to be added, and the volume and the cost of the device are correspondingly increased;
2) the relay coil needs to consume electric energy for keeping the attraction, the energy consumption of the system is increased, and if the system supplies power for the storage battery or has higher requirement on saving the electric energy, the traditional relay circuit cannot achieve the effect of saving energy;
3) the double-path switching relay is high in price, and due to the fact that the double-path switching relay is of an electromagnetic force attraction mechanism, the coil is provided with a magnetic core and the like, the double-path switching relay is large in size and not beneficial to miniaturization integration.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an automatic switching circuit of a standby power supply of a low-voltage apparatus.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an automatic switching circuit of low-voltage apparatus stand-by power supply for realize the automatic switch-over between low-voltage apparatus power supply commonly used and the stand-by power supply, the power output end and the low-voltage apparatus of this circuit are connected, including bleeder sub-circuit and switch sub-circuit, switch sub-circuit include the MOS pipe, MOS pipe source electrode be connected with stand-by power supply, the grid is connected with bleeder sub-circuit, the drain electrode is connected with power output end, power supply commonly used be connected with bleeder sub-circuit and power output end respectively.
The voltage division sub-circuit comprises a first resistor and a second resistor, the common power supply is grounded after sequentially passing through the first resistor and the second resistor, and the grid electrode of the MOS tube is connected between the first resistor and the second resistor.
The automatic switching circuit of the low-voltage apparatus standby power supply further comprises a first rectifier diode and a second rectifier diode, wherein the anode of the first rectifier diode is connected with a common power supply, the cathode of the first rectifier diode is connected with the power output end, the anode of the second rectifier diode is connected with the drain electrode of the MOS tube, and the cathode of the second rectifier diode is connected with the power output end.
The common power supply and the standby power supply are both 24V direct current power supplies.
The automatic switching circuit of the low-voltage apparatus standby power supply further comprises a capacitor, and the capacitor is arranged between the power output end and the ground.
The MOS tube is a P-channel MOS tube.
When the voltage of the common power supply is normal voltage, the MOS tube is in a cut-off state, and the power supply output end is only powered by the common power supply; when the voltage of the common power supply is lower than the normal voltage and higher than the threshold voltage, and the voltage of the standby power supply is the normal voltage, the MOS tube is in a semi-conducting state, and the power supply output end is powered by the common power supply and the standby power supply together; when the voltage of the common power supply is lower than the threshold voltage and the voltage of the standby power supply is normal voltage, the MOS tube is in a complete conduction state, and the power output end is only supplied with power by the standby power supply.
Compared with the prior art, the invention has the following advantages:
1) automatic switching without power failure: a transition stage is arranged between the switching of the common power supply and the standby power supply, the MOS tube is in a semi-conducting state at the stage, the common power supply and the standby power supply power together, the voltage can change temporarily in the process, the situations such as power failure and the like can not occur, and the rear-stage electric appliance is protected;
2) the energy consumption is low: according to the invention, the MOS tube is adopted to control the switching between the common power supply and the standby power supply, the MOS belongs to a voltage driving device, and the on-state and the off-state can be switched as long as the grid level has voltage, so that compared with a current-driven relay, the power consumption is greatly reduced, and the energy-saving effect is achieved;
3) small volume and low cost: compared with the traditional relay, the circuit has the advantages of reduced volume, contribution to miniaturization and integration, low price of each component and reduced cost.
Drawings
FIG. 1 is a dual power transfer circuit diagram of a dual transfer contact relay;
fig. 2 is a circuit diagram of the automatic switching of the backup power supply of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
The invention provides an automatic switching circuit of a standby power supply of a low-voltage apparatus, as shown in fig. 2, the automatic switching circuit comprises a common power supply, a standby power supply, a voltage dividing sub-circuit, a switch sub-circuit, a power output end V _ OUT, a first rectifying diode D1, a second rectifying diode D2 and a capacitor C1, wherein the switch sub-circuit comprises an MOS tube Q1, the source of the MOS tube Q1 is connected with the standby power supply, the grid is connected with the voltage dividing sub-circuit, the drain is connected with the power output end V _ OUT, the voltage dividing sub-circuit comprises a first resistor R1 and a second resistor R2 which are mutually connected, the other end of the first resistor R1 is respectively connected with the common power supply and the power output end V _ OUT, the second resistor R2 is grounded, and the grid of the MOS tube Q1 is connected between a first resistor R1.
The positive pole of the first rectifier diode D1 is connected with the first resistor R1, the negative pole is connected with the power output end V _ OUT, the positive pole of the second rectifier diode D2 is connected with the drain electrode of the MOS tube Q1, the negative pole is connected with the power output end V _ OUT, and the power output end V _ OUT is grounded GND through the capacitor C1.
When the voltage of the common power supply is normal voltage, the MOS tube Q1 is in a cut-off state, and the power supply output end V _ OUT is powered by the common power supply; when the voltage of the common power supply is lower than the normal voltage and higher than the threshold voltage, and the voltage of the standby power supply is the normal voltage, the MOS tube Q1 is in a semi-conducting state, and the power supply output end V _ OUT is powered by the common power supply and the standby power supply together; when the voltage of the common power supply is lower than the threshold voltage and the voltage of the standby power supply is the normal voltage, the MOS tube Q1 is in a complete conduction state, and the power output end V _ OUT is supplied with power by the standby power supply.
The threshold voltage is divided by the first resistor R1 and the second resistor R2 to form a gate voltage VgateThe value is the critical voltage value of the fully conducting MOS transistor Q1. The normal voltage is divided by the first resistor R1 and the second resistor R2 to form a gate voltage VgateThe value is the critical voltage value of the cut-off MOS transistor Q1.
In this embodiment, the normal power supply and the standby power supply are 24V dc, the normal voltage of the normal power supply is 24V, and the first resistor R1 and the second resistor R2 form the gate of the voltage divider driving MOS transistor Q1.
Voltage obtained by grid electrode
Wherein VinIs the common power supply input voltage. When the input voltage of the common power supply is 0, VgateWhen the input voltage of the common power supply is 24V, V is 0gateThe voltage is the critical voltage value of the cut-off of the MOS transistor Q1.
The working principle of the invention is as follows:
when the common power supply 24V is normal, under the partial pressure action of the first resistor R1 and the second resistor R2, the gate voltage turns off the MOS transistor Q1, the first diode D1 is turned on, and the power supply output terminal V _ OUT is supplied with power by the common power supply 24V.
When the voltage of the normal power supply is lower than 24V, and the standby power supply 24V is normal, under the partial pressure action of the first resistor R1 and the second resistor R2, the gate voltage makes the MOS transistor Q1 in a semi-conducting state, the first diode D1 and the second diode D2 are both conducting, and the normal power supply 24V and the standby power supply 24V supply power together.
When the normal power supply is reduced to be below the threshold voltage, and the standby power supply 24V is normal, the MOS transistor Q1 is in a complete conduction state under the voltage division effect of the first resistor R1 and the second resistor R2, and the standby power supply 24V supplies power.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides an automatic switching circuit of low-voltage apparatus stand-by power supply for realize the automatic switch-over between low-voltage apparatus common power supply and the stand-by power supply, the power output end and the low-voltage apparatus of this circuit are connected, its characterized in that, including voltage-dividing sub-circuit and switch sub-circuit, switch sub-circuit include MOS pipe (Q1), MOS pipe (Q1) source electrode be connected with stand-by power supply, the grid is connected with voltage-dividing sub-circuit, the drain electrode is connected with power output end (V _ OUT), common power supply be connected with voltage-dividing sub-circuit and power output end (V _ OUT) respectively.
2. The automatic switching circuit of the standby power supply of the low-voltage apparatus according to claim 1, wherein the voltage dividing sub-circuit comprises a first resistor (R1) and a second resistor (R2), the common power supply is grounded after passing through the first resistor (R1) and the second resistor (R2) in sequence, and the gate of the MOS transistor (Q1) is connected between the first resistor (R1) and the second resistor (R2).
3. The automatic switching circuit of the low-voltage apparatus backup power supply of claim 2, characterized in that, the automatic switching circuit of the low-voltage apparatus backup power supply further comprises a first rectifier diode (D1) and a second rectifier diode (D2), the anode of the first rectifier diode (D1) is connected to the common power supply, the cathode of the first rectifier diode is connected to the power output terminal (V _ OUT), the anode of the second rectifier diode (D2) is connected to the drain of the MOS transistor (Q1), and the cathode of the second rectifier diode is connected to the power output terminal (V _ OUT).
4. The automatic switching circuit of the standby power supply of the low-voltage apparatus according to claim 1, wherein the common power supply and the standby power supply are both 24V dc power supplies.
5. The automatic switching circuit for a low-voltage apparatus backup power supply of claim 1, characterized in that, the automatic switching circuit for a low-voltage apparatus backup power supply further comprises a capacitor (C1), the capacitor (C1) is disposed between the power output terminal (V _ OUT) and ground.
6. The automatic switching circuit of the standby power supply of the low-voltage apparatus according to claim 1, wherein the MOS transistor (Q1) is a P-channel MOS transistor.
7. The automatic switching circuit of the standby power supply of the low-voltage apparatus according to claim 6, wherein when the voltage of the common power supply is normal voltage, the MOS transistor (Q1) is in a cut-off state, and the power output end (V _ OUT) is only powered by the common power supply; when the voltage of the common power supply is lower than the normal voltage and higher than the threshold voltage, and the voltage of the standby power supply is the normal voltage, the MOS tube (Q1) is in a semi-conducting state, and the power supply output end (V _ OUT) is powered by the common power supply and the standby power supply together; when the common power supply voltage is lower than the threshold voltage and the standby power supply voltage is a normal voltage, the MOS transistor (Q1) is in a full conduction state, and the power supply output end (V _ OUT) is only supplied by the standby power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910294609.7A CN111817425A (en) | 2019-04-12 | 2019-04-12 | Automatic switching circuit of low-voltage apparatus stand-by power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910294609.7A CN111817425A (en) | 2019-04-12 | 2019-04-12 | Automatic switching circuit of low-voltage apparatus stand-by power supply |
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| Publication Number | Publication Date |
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| CN111817425A true CN111817425A (en) | 2020-10-23 |
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| CN201910294609.7A Pending CN111817425A (en) | 2019-04-12 | 2019-04-12 | Automatic switching circuit of low-voltage apparatus stand-by power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113571347A (en) * | 2021-07-28 | 2021-10-29 | 江西科旺科技有限公司 | Integrated voltage stabilizing and transforming power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001315A (en) * | 2012-12-26 | 2013-03-27 | 上海斐讯数据通信技术有限公司 | Power supply switching circuit |
| CN107516936A (en) * | 2017-09-08 | 2017-12-26 | 天津汇康医用设备有限公司 | A kind of direct current main secondary power switching circuit |
| CN209659001U (en) * | 2019-04-12 | 2019-11-19 | 上海亿盟电气自动化技术有限公司 | A kind of automatic switching circuit of low-voltage electrical apparatus backup power source |
-
2019
- 2019-04-12 CN CN201910294609.7A patent/CN111817425A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001315A (en) * | 2012-12-26 | 2013-03-27 | 上海斐讯数据通信技术有限公司 | Power supply switching circuit |
| CN107516936A (en) * | 2017-09-08 | 2017-12-26 | 天津汇康医用设备有限公司 | A kind of direct current main secondary power switching circuit |
| CN209659001U (en) * | 2019-04-12 | 2019-11-19 | 上海亿盟电气自动化技术有限公司 | A kind of automatic switching circuit of low-voltage electrical apparatus backup power source |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113571347A (en) * | 2021-07-28 | 2021-10-29 | 江西科旺科技有限公司 | Integrated voltage stabilizing and transforming power supply |
| CN113571347B (en) * | 2021-07-28 | 2023-11-17 | 江西科旺科技有限公司 | Integral type steady voltage transformation power |
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