CN111769630B - Electric power low-voltage direct-current redundant power supply system - Google Patents
Electric power low-voltage direct-current redundant power supply system Download PDFInfo
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- CN111769630B CN111769630B CN202010737605.4A CN202010737605A CN111769630B CN 111769630 B CN111769630 B CN 111769630B CN 202010737605 A CN202010737605 A CN 202010737605A CN 111769630 B CN111769630 B CN 111769630B
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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
- H02J9/061—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 for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention provides an electric power low-voltage direct-current redundant power supply system which comprises a rectifying circuit, a filter circuit, an overvoltage switch circuit, a voltage stabilizing circuit, a lithium battery unit and a detection switching circuit, wherein the rectifying circuit is connected with the filter circuit; the input end of the rectifying circuit is connected with commercial power, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the overvoltage switch circuit, the output end of the overvoltage switch circuit is connected with the first input end of the voltage stabilizing circuit, the detection input end of the detection switching circuit is connected with the output end of the overvoltage switch circuit, the power supply input end of the detection switching circuit is connected with the lithium battery unit, the power supply output end of the detection switching circuit is connected with the second input end of the voltage stabilizing circuit, the voltage stabilizing circuit supplies power to a load, the invention can continuously provide stable working power for the power detection equipment when the mains supply is powered off or the mains supply is in overvoltage to execute power-off protection, therefore, the working stability of the power detection equipment is ensured, and the stability of the whole power grid is further ensured.
Description
Technical Field
The invention relates to an electric power supply system, in particular to an electric low-voltage direct-current redundant power supply system.
Background
In the operation process of the power grid, various detection and monitoring devices are provided for detecting state parameters of various power transformation devices, power transmission devices and the like in the power grid, and then corresponding operation and maintenance are performed according to the detection parameters, so that the operation stability of the power grid is ensured, and therefore, the working stability of the detection device of the power system is one of the key factors for the stability of the power grid.
The stability of the detection equipment of the power system is removed from the attribute of the detection equipment, and is closely related to the stability of a power supply system of the power system, the detection equipment of the power system generally adopts low-voltage direct current, in the prior art, the detection equipment of the power system generally adopts mains supply (220V alternating current) to supply power to electric equipment after rectification, filtering and voltage reduction treatment, but the mains supply also has unstable factors, such as power failure, overvoltage and the like, so that the influence is caused on the detection equipment of the power system.
Therefore, in order to solve the above technical problems, it is necessary to provide a new technical means for solving the problems.
Disclosure of Invention
In view of this, an object of the present invention is to provide a power low-voltage dc redundant power supply system, which can continuously provide stable working power to a power detection device when a power failure occurs in a mains supply or when a power failure protection is performed in a mains supply overvoltage, so as to ensure the working stability of the power detection device, and further ensure the stability of the whole power grid.
The invention provides an electric power low-voltage direct-current redundant power supply system which comprises a rectifying circuit, a filter circuit, an overvoltage switch circuit, a voltage stabilizing circuit, a lithium battery unit and a detection switching circuit, wherein the rectifying circuit is connected with the filter circuit;
the input end of the rectifying circuit is connected to a mains supply, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the overvoltage switch circuit, the output end of the overvoltage switch circuit is connected with the first input end of the voltage stabilizing circuit, the detection input end of the detection switching circuit is connected to the output end of the overvoltage switch circuit, the power input end of the detection switching circuit is connected to the lithium battery unit, the power output end of the detection switching circuit is connected to the second input end of the voltage stabilizing circuit, and the voltage stabilizing circuit supplies power to a load.
Further, the lithium battery unit comprises a lithium battery charging and discharging management circuit and a standby lithium battery;
the input of lithium battery charge and discharge management circuit is connected in overvoltage switch circuit's output, charge and discharge management circuit's output is connected with reserve lithium battery's anodal, and reserve lithium battery's anodal is connected with the power input that detects switching circuit.
Further, the detection switching circuit comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a controllable precise voltage-stabilizing source U2, a comparator U1, a triode Q2, an optical coupler OC1 and a silicon controlled rectifier SCR 1;
one end of a resistor R7 is connected to the output end of the overvoltage switching circuit, the other end of a resistor R7 is grounded through a resistor R8, one end of a resistor R9 is connected to the output end of the overvoltage switching circuit, the other end of a resistor R9 is connected with the negative electrode of a controllable precise voltage-stabilizing source U2, the positive electrode of the controllable precise voltage-stabilizing source U2 is grounded, the reference electrode of the controllable precise voltage-stabilizing source U2 is connected to the common connection point between the resistor R7 and the resistor R8, the negative electrode of the controllable precise voltage-stabilizing source U2 is connected to the same-phase end of a comparator U1 through a resistor R10, the inverting end of the comparator U1 is grounded through a resistor R11, the output end of the comparator U1 is connected to the base electrode of a triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected to the negative electrode of a light-emitting diode of an optocoupler OC1, the positive electrode of the light-emitting diode of the optocoupler OC1 is connected to a power VCC, the collector of a phototransistor 1 is connected to a power supply VCC through a resistor R12, the emitting electrode of the phototriode of the optocoupler OC1 is grounded, the collecting electrode of the phototriode of the optocoupler OC1 is connected with the control electrode of the controlled silicon SCR1 through the resistor R13, the positive electrode of the controlled silicon SCR1 is connected to a standby lithium battery as the power input end of the detection switching circuit, and the negative electrode of the controlled silicon SCR1 is connected to the second input end of the voltage stabilizing circuit as the power output end of the detection switching circuit.
Further, the voltage stabilizing circuit comprises a silicon chain D1, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a triode Q4, a triode Q3 and a controllable precise voltage stabilizing source U3;
the positive electrode of a silicon chain D1 is used as a first input end of the voltage stabilizing circuit, the negative electrode of the silicon chain D1 is connected with the collector of a triode Q4, the base of the triode Q4 is connected with the collector of a triode Q3, the emitter of the triode Q3 is grounded, the base of the triode Q3 is grounded through a resistor R17, the base of the triode Q3 is connected with the negative electrode of a controllable precise voltage stabilizing source U3 through a resistor R15, the negative electrode of the controllable precise voltage stabilizing source U3 is connected with the collector of a triode Q4 through a resistor R14, the collector of the triode Q4 is used as a second input end of the voltage stabilizing circuit, the positive electrode of the controllable precise voltage stabilizing source U3 is grounded, the emitter of a triode Q4 is used as an output end of the voltage stabilizing circuit, one end of the resistor R16 is connected with the emitter of a triode Q4, the other end of a resistor R17 is grounded through a resistor R18, and a common connection point of the resistor R16 and the resistor R18 is connected with a reference electrode of the controllable precise voltage stabilizing circuit U3.
Further, the overvoltage switch circuit comprises a resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a triode Q1 and an NMOS transistor Q5;
one end of the resistor R1 is used as the input end of the overvoltage switch circuit, the other end of the resistor R1 is connected with the drain electrode of the NMOS tube Q5, and the source electrode of the NMOS tube Q5 is used as the output end of the overvoltage switch circuit;
the drain of the NMOS transistor Q5 is connected to the gate of the NMOS transistor Q5 through a resistor R5, the gate of the NMOS transistor Q5 is grounded through a resistor R6, the collector of the triode Q1 is connected to the gate of the NMOS transistor Q5, the emitter of the triode Q1 is grounded, one end of the piezoresistor R2 is connected to the drain of the NMOS transistor Q5, the other end of the piezoresistor R2 is grounded after being connected in series with the resistor R4 through a resistor R3, and the common connection point of the resistor R3 and the resistor R4 is connected to the base of the triode Q1.
The invention has the beneficial effects that: according to the invention, stable working electricity can be continuously provided for the power detection equipment when the mains supply is powered off or the mains supply is in overvoltage to perform power-off protection, so that the working stability of the power detection equipment is ensured, and the stability of the whole power grid is further ensured.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the over-voltage switch circuit, the detection switch circuit and the voltage regulator circuit according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
the invention provides an electric power low-voltage direct-current redundant power supply system which comprises a rectifying circuit, a filter circuit, an overvoltage switch circuit, a voltage stabilizing circuit, a lithium battery unit and a detection switching circuit, wherein the rectifying circuit is connected with the filter circuit;
the input end of the rectifying circuit is connected with commercial power, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the overvoltage switch circuit, the output end of the overvoltage switch circuit is connected with the first input end of the voltage stabilizing circuit, the detection input end of the detection switching circuit is connected with the output end of the overvoltage switch circuit, the power supply input end of the detection switching circuit is connected with the lithium battery unit, the power output end of the detection switching circuit is connected with the second input end of the voltage stabilizing circuit, the voltage stabilizing circuit supplies power to the load, the invention can continuously provide stable working power for the power detection equipment when the mains supply is powered off or the mains supply is in overvoltage to execute power-off protection, therefore, the working stability of the power detection equipment is ensured, and the stability of the whole power grid is further ensured; the rectification circuit is a full-bridge rectification circuit consisting of the existing diodes, and the filter circuit adopts the existing LC filter circuit and can also adopt other filter circuits for filtering out alternating current components.
In this embodiment, the lithium battery unit includes a lithium battery charging and discharging management circuit and a standby lithium battery;
the input of lithium cell charge and discharge management circuit connects in overvoltage switch circuit's output, charge and discharge management circuit's output is connected with reserve lithium cell's positive pole, reserve lithium cell's positive pole is connected with the power input end that detects switching circuit, wherein, lithium cell charge and discharge management circuit adopts chips such as ME4057ASPG, SD8054 for carry out charge and discharge management to reserve lithium cell, of course, these chips all have corresponding peripheral circuit, for example voltage stabilizing circuit, filter circuit etc. belong to prior art, in order to satisfy the demand of load, can adopt a plurality of lithium cells to establish ties and reach the power supply demand voltage of load.
In this embodiment, the detection switching circuit includes a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a controllable precision voltage regulator U2, a comparator U1, a triode Q2, an optocoupler OC1, and a thyristor SCR 1;
one end of a resistor R7 is connected to the output end of the overvoltage switch circuit, the other end of a resistor R7 is grounded through a resistor R8, one end of a resistor R9 is connected to the output end of the overvoltage switch circuit, the other end of a resistor R9 is connected with the negative electrode of a controllable precision voltage-stabilizing source U2, the positive electrode of the controllable precision voltage-stabilizing source U2 is grounded, the reference electrode of the controllable precision voltage-stabilizing source U2 is connected to the common connection point between the resistor R7 and the resistor R8, the negative electrode of the controllable precision voltage-stabilizing source U2 is connected to the same-phase end of a comparator U1 through a resistor R10, the reverse-phase end of the comparator U1 is grounded through a resistor R11, the output end of the comparator U1 is connected to the base electrode of a triode Q2, the emitter electrode of a triode Q2 is grounded, the collector electrode of a triode Q2 is connected to the negative electrode of a light-emitting diode of an optical coupler OC1, the positive electrode of the optical coupler OC1 is connected to a power supply VCC, the collector electrode of a phototransistor 1 is connected to a power supply VCC through a resistor R12, in the circuit, a resistor R7 and a resistor R8 are used for providing reference voltage for a controllable precise voltage-stabilizing source U2, the controllable precise voltage-stabilizing source U2 provides a detection signal for a comparator U1, when the voltage of the same phase end of the comparator U1 is greater than 0, which indicates that the mains supply is not powered off or the whole system is not in overvoltage power-off protection, the comparator U1 outputs high level, a triode Q2 is conducted, the optical coupler OC1 is cut off, the silicon controlled rectifier 1 does not act, when the mains supply is powered off or the mains supply is protected to be powered off, the same phase end of the comparator U1 and the opposite phase end voltage are equal, the output of the SCR is 0, the triode Q2 is cut off, the optocoupler OC1 is also cut off, at the moment, the power supply VCC provides trigger current to the control electrode of the SCR1 through the resistor R12 and the resistor R3, the SCR1 is switched on, a standby battery supplies power to the second input end of the voltage stabilizing circuit, when the mains supply is recovered or the overvoltage protection power failure is relieved, the positive voltage is loaded on the negative electrode of the SCR1, the SCR1 is cut off, the standby lithium battery stops supplying power, the power is converted into the mains supply, the corresponding speed of the whole switching process is high, and the seamless switching can be almost achieved.
In this embodiment, the voltage stabilizing circuit includes a silicon chain D1, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a transistor Q4, a transistor Q3, and a controllable precision voltage stabilizing source U3;
the positive pole of a silicon chain D1 is used as a first input end of a voltage stabilizing circuit, the negative pole of a silicon chain D1 is connected with the collector of a triode Q4, the base of the triode Q4 is connected with the collector of a triode Q3, the emitter of the triode Q3 is grounded, the base of a triode Q3 is grounded through a resistor R17, the base of the triode Q3 is connected with the negative pole of a controllable precise voltage stabilizing source U3 through a resistor R15, the negative pole of the controllable precise voltage stabilizing source U3 is connected with the collector of a triode Q4 through a resistor R14, the collector of the triode Q4 is used as a second input end of the voltage stabilizing circuit, the positive pole of the controllable precise voltage stabilizing source U3 is grounded, the emitter of a triode Q4 is used as an output end of the voltage stabilizing circuit, one end of the resistor R16 is connected with the emitter of a triode Q4, the other end of a resistor R17 is grounded through a resistor R18, the common connection point of the resistors R16 and R18 is connected with the reference pole of the controllable precise voltage stabilizing circuit U3, thereby ensure the stability of the work electricity of providing the load, wherein, silicon chain D1 is that a plurality of diodes concatenate the formation, plays the effect of step-down protection on the one hand, and on the other hand plays and prevents palirrhea effect.
In this embodiment, the overvoltage switching circuit includes a resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a transistor Q1, and an NMOS transistor Q5;
one end of the resistor R1 is used as the input end of the overvoltage switch circuit, the other end of the resistor R1 is connected with the drain electrode of the NMOS tube Q5, and the source electrode of the NMOS tube Q5 is used as the output end of the overvoltage switch circuit;
the drain of the NMOS transistor Q5 is connected to the gate of the NMOS transistor Q5 through a resistor R5, the gate of the NMOS transistor Q5 is grounded through a resistor R6, the collector of the triode Q1 is connected to the gate of the NMOS transistor Q5, the emitter of the triode Q1 is grounded, one end of the varistor R2 is connected to the drain of the NMOS transistor Q5, the other end of the varistor R2 is grounded after being connected in series with the resistor R4 through a resistor R3, the common connection point of the resistor R3 and the resistor R4 is connected to the base of the triode Q1, the varistor R2 is used for clamping the input voltage, when the voltage is too high, the varistor R2 is turned on, the triode Q1 is triggered to be turned on after voltage division by the resistor R3 and the resistor R4, the gate of the NMOS transistor Q5 is turned off due to lose electricity, overvoltage protection is realized, the corresponding speed of the whole overvoltage protection is realized, and good protection is formed for subsequent circuits.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (3)
1. The utility model provides an electric power low pressure direct current redundant power supply system which characterized in that: the lithium battery detection switching circuit comprises a rectifying circuit, a filter circuit, an overvoltage switching circuit, a voltage stabilizing circuit, a lithium battery unit and a detection switching circuit;
the input end of the rectifying circuit is connected to a mains supply, the output end of the rectifying circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the input end of the overvoltage switch circuit, the output end of the overvoltage switch circuit is connected with the first input end of the voltage stabilizing circuit, the detection input end of the detection switching circuit is connected with the output end of the overvoltage switch circuit, the power supply input end of the detection switching circuit is connected to the lithium battery unit, the power supply output end of the detection switching circuit is connected to the second input end of the voltage stabilizing circuit, and the voltage stabilizing circuit supplies power to a load;
the lithium battery unit comprises a lithium battery charging and discharging management circuit and a standby lithium battery;
the input end of the lithium battery charging and discharging management circuit is connected with the output end of the overvoltage switch circuit, the output end of the charging and discharging management circuit is connected with the anode of the standby lithium battery, the anode of the standby lithium battery is connected with the power supply input end of the detection switching circuit,
the detection switching circuit comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a controllable precise voltage-stabilizing source U2, a comparator U1, a triode Q2, an optical coupler OC1 and a controllable silicon SCR 1;
one end of a resistor R7 is connected to the output end of the overvoltage switching circuit, the other end of a resistor R7 is grounded through a resistor R8, one end of a resistor R9 is connected to the output end of the overvoltage switching circuit, the other end of a resistor R9 is connected with the negative electrode of a controllable precise voltage-stabilizing source U2, the positive electrode of the controllable precise voltage-stabilizing source U2 is grounded, the reference electrode of the controllable precise voltage-stabilizing source U2 is connected to the common connection point between the resistor R7 and the resistor R8, the negative electrode of the controllable precise voltage-stabilizing source U2 is connected to the same-phase end of a comparator U1 through a resistor R10, the inverting end of the comparator U1 is grounded through a resistor R11, the output end of the comparator U1 is connected to the base electrode of a triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected to the negative electrode of a light-emitting diode of an optocoupler OC1, the positive electrode of the light-emitting diode of the optocoupler OC1 is connected to a power VCC, the collector of a phototransistor 1 is connected to a power supply VCC through a resistor R12, the emitting electrode of a phototriode of the optocoupler OC1 is grounded, the collecting electrode of the phototriode of the optocoupler OC1 is connected with the control electrode of the controlled silicon SCR1 through a resistor R13, the positive electrode of the controlled silicon SCR1 is connected to a standby lithium battery as the power supply input end of the detection switching circuit, and the negative electrode of the controlled silicon SCR1 is connected to the second input end of the voltage stabilizing circuit as the power supply output end of the detection switching circuit.
2. The redundant power supply system of claim 1, characterized in that: the voltage stabilizing circuit comprises a silicon chain D1, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a triode Q4, a triode Q3 and a controllable precise voltage stabilizing source U3;
the positive electrode of a silicon chain D1 is used as a first input end of a voltage stabilizing circuit, the negative electrode of a silicon chain D1 is connected with the collector electrode of a triode Q4, the base electrode of the triode Q4 is connected with the collector electrode of a triode Q3, the emitter electrode of the triode Q3 is grounded, the base electrode of a triode Q3 is grounded through a resistor R17, the base electrode of the triode Q3 is connected with the negative electrode of a controllable precise voltage stabilizing source U3 through a resistor R15, the negative electrode of the controllable precise voltage stabilizing source U3 is connected with the collector electrode of a triode Q4 through a resistor R14, the collector electrode of the triode Q4 is used as a second input end of the voltage stabilizing circuit, the positive electrode of the controllable precise voltage stabilizing source U3 is grounded, the emitter electrode of a triode Q4 is used as an output end of the voltage stabilizing circuit, one end of the resistor R16 is connected with the emitter electrode of a triode Q4, the other end of a resistor R17 is grounded through a resistor R18, and the common connection point of the resistor R16 and the resistor R18 is connected with the reference electrode of the controllable precise voltage stabilizing circuit U3.
3. The electrical low-voltage dc redundant power supply system according to claim 1, wherein: the overvoltage switch circuit comprises a resistor R1, a voltage dependent resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a triode Q1 and an NMOS tube Q5;
one end of the resistor R1 is used as the input end of the overvoltage switch circuit, the other end of the resistor R1 is connected with the drain electrode of the NMOS tube Q5, and the source electrode of the NMOS tube Q5 is used as the output end of the overvoltage switch circuit;
the drain of the NMOS transistor Q5 is connected to the gate of the NMOS transistor Q5 through a resistor R5, the gate of the NMOS transistor Q5 is grounded through a resistor R6, the collector of the triode Q1 is connected to the gate of the NMOS transistor Q5, the emitter of the triode Q1 is grounded, one end of the piezoresistor R2 is connected to the drain of the NMOS transistor Q5, the other end of the piezoresistor R2 is grounded after being connected in series with the resistor R4 through a resistor R3, and the common connection point of the resistor R3 and the resistor R4 is connected to the base of the triode Q1.
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| CN202010737605.4A CN111769630B (en) | 2020-07-28 | 2020-07-28 | Electric power low-voltage direct-current redundant power supply system |
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| CN112421755A (en) * | 2020-10-30 | 2021-02-26 | 国家电网有限公司 | Power supply system for electric power monitoring based on Internet of things |
| CN112421763B (en) * | 2020-11-28 | 2023-02-28 | 国家电网有限公司 | Electric power direct current power supply control system |
| CN112751410B (en) * | 2020-12-28 | 2023-06-23 | 国家电网有限公司 | Power supply control circuit of low-voltage direct current circuit |
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| CN202333882U (en) * | 2011-11-21 | 2012-07-11 | 漳州科华技术有限责任公司 | Direct-current power supply having redundant backup function |
| CN203312887U (en) * | 2013-07-01 | 2013-11-27 | 中国移动通信集团河南有限公司 | DC emergency power supply |
| CN203660548U (en) * | 2013-12-30 | 2014-06-18 | 广西大学 | Transformer substation direct-current power supply system provided with emergency stand-by power supply |
| CN105471233A (en) * | 2014-08-20 | 2016-04-06 | 中兴通讯股份有限公司 | AC power supply transient interruption triggering device |
| CN209658987U (en) * | 2019-04-11 | 2019-11-19 | 重庆工业职业技术学院 | Low-voltage dc power supply with overvoltage protection |
| CN210898633U (en) * | 2019-12-30 | 2020-06-30 | 国家电网有限公司 | Redundant direct current power supply switching system for power communication |
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