CN112583107B - Power supply switching circuit and power supply switching system - Google Patents

Power supply switching circuit and power supply switching system Download PDF

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Publication number
CN112583107B
CN112583107B CN202011474514.2A CN202011474514A CN112583107B CN 112583107 B CN112583107 B CN 112583107B CN 202011474514 A CN202011474514 A CN 202011474514A CN 112583107 B CN112583107 B CN 112583107B
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China
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unit
module
power supply
output end
input end
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CN112583107A (en
Inventor
范逸超
梁海勋
何伟豪
林兆基
何庆勉
蓝爱文
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Guangdong Sunly Broadband Network Co ltd
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Guangdong Sunly Broadband Network Co ltd
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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
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms
    • 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
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a power supply switching circuit and a power supply switching system, wherein the power supply switching circuit comprises a first protection unit, a second protection unit, a switching unit and a comparison unit; the input end of the first protection unit is connected with the main power supply, and the output end of the first protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit; the input end of the second protection unit is connected with a standby power supply, the output end of the second protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit, and the output end of the switching unit is connected with equipment to be powered; the output end of the comparison unit is connected with the input end of the switching unit; according to the power supply switching circuit, the comparison unit can know the working conditions of the main power supply and the standby power supply, if the main power supply works abnormally, the comparison unit outputs a control signal to the switching unit, the switching unit is switched to the standby power supply to supply power, the power supply is ensured to be normal, and the power supply stability is improved.

Description

Power supply switching circuit and power supply switching system
Technical Field
The present invention relates to the field of power supply circuits, and in particular, to a power supply switching circuit and a power supply switching system.
Background
Optical workstations are commonly used in broadcast television, communications, and the like, and in hybrid fiber coaxial networks, the optical workstations are used to perform bi-directional optical-to-electrical signal conversion from the front end to the subscriber, providing high quality television, broadcast, and data signals to the subscriber.
In the working process of the existing optical work station, only one power supply is generally adopted for supplying power, one power supply simultaneously provides stable working voltage for a plurality of main controllers, and one main controller simultaneously controls the plurality of optical work stations to work; if the power supply is damaged and the like, the power supply cannot supply power to the optical workstation, a plurality of users cannot perform network communication or cannot watch television normally, and the use experience of the users is reduced.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a power supply switching circuit, in which a comparing unit knows the working conditions of a main power supply and a standby power supply in real time, and if the main power supply works abnormally, the switching unit switches to the standby power supply to supply power, so as to improve the power supply stability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a power supply switching circuit comprises a first protection unit, a second protection unit, a switching unit and a comparison unit; the input end of the first protection unit is connected with the main power supply, and the output end of the first protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit; the input end of the second protection unit is connected with a standby power supply, the output end of the second protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit, and the output end of the switching unit is connected with equipment to be powered; the output end of the comparison unit is connected with the input end of the switching unit.
In the power supply switching circuit, the comparison unit comprises a power factor correction module, a voltage reduction module and a comparison module, wherein the input end of the power factor correction module is respectively connected with the output end of the first protection unit and the output end of the second protection unit, and the output end of the power factor correction module is connected with the input end of the voltage reduction module; the output end of the voltage reduction module is connected with the comparison module, the input end of the comparison module is connected with the output ends of the first protection unit and the second protection unit respectively, and the output end of the comparison module is connected with the input end of the switching unit.
In the power supply switching circuit, the first protection unit comprises a first rectifying module and a second rectifying module, the input end of the first rectifying module is connected with a main power supply, and the output end of the first rectifying module is respectively connected with the input end of the power factor correction module and the input end of the switching unit; the output end of the second rectifying module is connected with the input end of the comparison module.
In the power supply switching circuit, the second protection unit comprises a third rectifying module and a fourth rectifying module, the input end of the third rectifying module is connected with a standby power supply, and the output end of the third rectifying module is respectively connected with the input end of the power factor correction module and the input end of the switching unit; the output end of the fourth rectifying module is connected with the input end of the comparison module.
The power supply switching circuit further comprises a radio frequency signal output unit, wherein the input end of the radio frequency signal output unit is connected with the output end of the second protection unit, and the output end of the radio frequency signal output unit is connected with the cable modem; the comparing unit is connected with the radio frequency signal output unit, the comparing unit adjusts the working voltage of the radio frequency signal output unit, and the radio frequency signal output unit outputs alarm information to the cable modem.
In the power supply switching circuit, the radio frequency signal output unit comprises a signal output module and a fourth protection module, wherein the input end of the signal output module is connected with the output end of the second protection unit, and the output end of the signal output module is connected with the input end of the fourth protection module; the input end of the fourth protection module is also connected with the output end of the comparison unit, and the output end of the fourth protection module is connected with the cable modem; the comparison unit is connected with the signal output module and adjusts the working voltage of the signal output module.
In the power supply switching circuit, the comparison module comprises a first comparison amplifier, a second comparison amplifier, a first absorption part and a second absorption part, wherein a pin In 2-of the second comparison amplifier is connected with the output end of the first protection unit, a pin In2+ of the second comparison amplifier is connected with the output end of the second protection unit, and the output end of the second comparison amplifier is connected with the second absorption part; the output end of the second absorption part is respectively connected with the pin In1-, the switching unit and the signal output module of the first comparison amplifier; the pin In1+ of the first comparison amplifier is connected with the output end of the voltage reduction unit, and the output end of the first comparison amplifier is connected with the first absorption part; the output end of the first absorption part is respectively connected with the signal output module and the fourth protection module.
In the power supply switching circuit, the signal output module includes a ninth diode D9, a tenth diode D10, an eleventh diode D11, and a twelfth diode D12; the output end of the first absorption part is connected with the anode of the twelfth polar tube D10 and the anode of the eleventh diode D11; the output end of the second protection unit is connected with the negative electrode of the twelfth electrode tube D10, and the negative electrode of the eleventh diode D11 is connected with the input end of the fourth protection module; the output end of the second absorption portion is connected with the positive electrode of a ninth diode D9 and the positive electrode of a twelfth diode D12, the negative electrode of the ninth diode D9 is connected with the negative electrode of the twelfth diode D10, and the negative electrode of the twelfth diode D12 is connected with the negative electrode of the eleventh diode D11.
The power supply switching circuit further comprises a third protection unit, wherein the output end of the switching unit is connected with the input end of the third protection unit, and the output end of the third protection unit is connected with equipment to be powered.
The invention also correspondingly provides a power supply switching system which comprises a main power supply, a standby power supply, a switching device and a cable modem, wherein the switching device comprises a PCB board, any power supply switching circuit is printed on the PCB board, the input end of the switching device is respectively connected with the main power supply and the standby power supply, and the output end of the switching device is respectively connected with the cable modem and equipment to be powered.
The beneficial effects are that:
the invention provides a power supply switching circuit which comprises a first protection unit, a second protection unit, a comparison unit and a switching unit, wherein the first protection unit and the second protection unit respectively process input voltages of a main power supply and a standby power supply to ensure power supply stability; the comparison unit can know the working conditions of the main power supply and the standby power supply in real time, if the main power supply works abnormally, the comparison unit outputs a control signal to the switching unit, and the switching unit is switched to the standby power supply to supply power, so that the normal power supply is ensured, and the power supply stability is improved; in addition, the power supply switching circuit further comprises a signal output module, and when the main power supply works abnormally, the signal output module outputs an alarm signal to the cable modem, so that the operation and maintenance efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a power supply switching circuit according to the present invention;
FIG. 2 is a circuit diagram of a first protection unit according to the present invention;
FIG. 3 is a circuit diagram of a second protection unit according to the present invention;
FIG. 4 is a circuit diagram of a PFC module according to the present invention;
FIG. 5 is a circuit block diagram of the buck module provided by the present invention;
FIG. 6 is a circuit diagram of a comparison module according to the present invention;
FIG. 7 is a circuit diagram of a switching unit according to the present invention;
FIG. 8 is a circuit diagram of a signal output module according to the present invention;
fig. 9 is a circuit configuration diagram of a fourth protection module according to the present invention;
fig. 10 is a circuit configuration diagram of a third protection unit according to the present invention.
Description of main reference numerals: 11-first rectifying module, 12-second rectifying module, 21-third rectifying module, 22-fourth rectifying module, 31-first absorbing part, 32-second absorbing part.
Detailed Description
The invention provides a power supply switching circuit and a power supply switching system, which are used for making the purposes, technical schemes and effects of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and the embodiments.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and the like should be construed broadly, and that the specific meaning of the terms in the present invention may be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 10, the present invention provides a power supply switching circuit, which includes a first protection unit, a second protection unit, a switching unit, and a comparison unit; the input end of the first protection unit is connected with the main power supply, and the output end of the first protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit; the input end of the second protection unit is connected with a standby power supply, the output end of the second protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit, and the output end of the switching unit is connected with equipment to be powered; the output end of the comparison unit is connected with the input end of the switching unit.
According to the power supply switching circuit disclosed by the application, the first protection unit and the second protection unit respectively process the input voltages of the main power supply and the standby power supply, so that the power supply stability is ensured; the comparison unit samples, compares and calculates the working information of the main power supply and the standby power supply, when the main power supply has abnormal working condition, the comparison unit outputs a control signal to the switching unit, and the switching unit is switched to the standby power supply to supply power, so that the normal power supply is ensured, and the power supply stability is improved.
In one embodiment, the switching unit includes a relay K1 and an eighth diode D8, where a fifth port of the relay K1 is connected to an output end of the second absorption portion, a fourth port of the relay K1 is grounded, a third port of the relay K1 is connected to an output end of the first rectifying module, a second port of the relay K1 is connected to an output end of the third rectifying module, and a first port of the relay K1 is connected to the device to be powered; the positive electrode of the eighth diode D8 is grounded, and the negative electrode of the eighth diode D8 is connected with the fifth port of the relay K1.
Further, referring to fig. 1 to 6, the comparing unit includes a power factor correction module, a voltage reduction module and a comparing module, wherein an input end of the power factor correction module is connected with an output end of the first protection unit and an output end of the second protection unit, respectively, and an output end of the power factor correction module is connected with an input end of the voltage reduction module; the output end of the voltage reduction module is connected with the comparison module, the input end of the comparison module is connected with the output ends of the first protection unit and the second protection unit respectively, and the output end of the comparison module is connected with the input end of the switching unit.
In one embodiment, referring to fig. 4, the power factor correction module includes a first transient diode TVS1, a first transformer T1, a third capacitor C3, a fourth inductor L4, a fifth inductor L5, a fourth capacitor C4, a sixth inductor L6, and a seventh inductor L7; one end of the first transient diode TVS1 is connected with the output end of the first protection unit or the second protection unit, and the other end of the first transient diode TVS1 is grounded; the pin 1 of the first transformer T1 is connected with one end of the first transient diode TVS1, the pin 3 of the first transformer T1 is grounded, the pin 2 of the first transformer T1 is connected with one end of the third capacitor C3, and the pin 4 of the first transformer T1 is connected with one end of the sixth inductor L6; one end of the fifth inductor L5 is connected with the other end of the third capacitor C3, and the other end of the fifth inductor L5 is connected with the input end of the voltage reduction module; one end of the seventh inductor L7 is connected with the other end of the sixth inductor L6, and the other end of the seventh inductor L7 is grounded; the fourth inductor L4 is connected in parallel with the third capacitor C3, and the fourth capacitor C4 is connected in parallel with the sixth inductor L6; the power factor correction module can improve the power factor of the power supply switching circuit, has the functions of protection and anti-reverse, can absorb surge power and improves the stability of the power supply switching circuit during operation.
In one embodiment, referring to fig. 5, the voltage reducing module includes a first control chip U1, where the model of the first control chip U1 is MP9486A; the pin VIN of the first control chip U1 is connected with the power factor correction module, and the pin 3 of the first control chip U1 is also connected with a plurality of capacitors and inductors; the pin EN of the first control chip U1 is connected with the pin DIM; the step-down module further comprises a fifteenth capacitor C15, a seventh diode D7, a tenth inductor L10, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19 and a twentieth capacitor C20; the pin BST of the first control chip U1 is connected with one end of a fifteenth capacitor C15, and the other end of the fifteenth capacitor C15 is respectively connected with the negative electrode of a seventh diode D7 and one end of a tenth inductor L10; the cathode of the seventh diode D7 is also connected with the pin SW of the first control chip U1, and the cathode of the seventh diode D7 is grounded; the other end of the tenth inductor L10 is connected with one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with one end of a ninth resistor R9, and the other end of the ninth resistor R9 is grounded; the pin FB of the first control chip U1 is connected to one end of a tenth resistor R10, the other end of the tenth resistor R10 is connected to one end of a sixteenth capacitor C16, and the other end of the sixteenth capacitor C16 and the other end of the tenth inductor L10 are respectively connected to one end of a seventeenth capacitor C17, one end of an eighteenth capacitor C18, one end of a nineteenth capacitor C19, one end of a twentieth capacitor C20 and a comparison module; the other end of the seventeenth capacitor C17, the other end of the eighteenth capacitor C18, the other end of the nineteenth capacitor C19 and the other end of the twentieth capacitor C20 are grounded; the step-down module converts the input voltage of the power factor correction module into 12V direct current voltage and outputs the 12V direct current voltage to the comparison module.
Further, referring to fig. 2, 4, 6 and 7, the first protection unit includes a first rectifying module and a second rectifying module, an input end of the first rectifying module is connected to the main power supply, and an output end of the first rectifying module is connected to an input end of the pfc module and an input end of the switching unit respectively; the output end of the second rectifying module is connected with the input end of the comparison module.
In one embodiment, referring to fig. 2, the first rectifying module includes a first fuse F1, a first diode D1, a second diode D2, a first gas discharge tube G1, and a first varistor M1; the main power supply is respectively connected with the switching unit, one end of the first fuse F1 and one end of the first gas discharge tube G1, the other end of the first fuse F1 is connected with the positive electrode of the first diode D1, the negative electrode of the first diode D1 is respectively connected with the positive electrodes of the second rectifying module and the second diode D2, and the negative electrode of the second diode D2 is connected with the input end of the power factor correction module; the other end of the first gas discharge tube G1 is connected with one end of the first piezoresistor M1, and the other end of the first piezoresistor M1 is grounded.
In one embodiment, referring to fig. 2, the second rectifying module includes a first resistor R1, a second resistor R2, a third diode D3, a first capacitor C1, and a third resistor R3; one end of the first resistor R1 is connected with the cathode of the first diode D1, the other end of the first resistor R1 is respectively connected with one end of the second resistor R2 and the anode of the third diode D3, and the cathode of the third diode D3 is respectively connected with one end of the first capacitor C1, one end of the third resistor R3 and the pin In 2-of the second comparator; the other end of the second resistor R2, the other end of the first capacitor C1 and the other end of the third resistor R3 are grounded.
The first rectifying module and the second rectifying module rectify the input voltage of the main power supply, and ensure that the input voltage input to the power factor correction module and the comparison module is direct current voltage.
Further, referring to fig. 3, fig. 4, fig. 6 and fig. 7, the second protection unit includes a third rectifying module and a fourth rectifying module, an input end of the third rectifying module is connected with the standby power supply, and an output end of the third rectifying module is connected with an input end of the pfc module and an input end of the switching unit respectively; the output end of the fourth rectifying module is connected with the input end of the comparison module.
In one embodiment, referring to fig. 3, the first rectifying module includes a second fuse F2, a fourth diode D4, a fifth diode D5, a second gas discharge tube G2, a second varistor M2, a first inductor L1 and a second inductor L2; the standby power supply is respectively connected with one end of a first inductor L1, one end of a second inductor L2, one end of a second fuse F2 and one end of a second gas discharge tube G2, the other end of the first inductor L1 is connected with the signal output module, and the other end of the second inductor L2 is connected with the switching unit; the other end of the second fuse F2 is connected with the positive electrode of a fourth diode D4, the negative electrode of the fourth diode D4 is respectively connected with the positive electrodes of a fourth rectifying module and a fifth diode D5, and the negative electrode of the fifth diode D5 is connected with the input end of the power factor correction module; the other end of the second gas discharge tube G2 is connected with one end of the second piezoresistor M2, and the other end of the second piezoresistor M2 is grounded.
In one embodiment, referring to fig. 3, the fourth rectifying module includes a fourth resistor R4, a fifth resistor R5, a sixth diode D6, a second capacitor C2, and a seventh resistor R7; one end of the fourth resistor R4 is connected with the cathode of the first diode D1, the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5, one end of the sixth resistor R6 and the anode of the sixth diode D6, and the cathode of the sixth diode D6 is connected with one end of the second capacitor C2, one end of the seventh resistor R7 and the pin in2+ of the second comparator; the other end of the fifth resistor R5, the other end of the sixth resistor R6, the other end of the second capacitor C2, and the other end of the seventh resistor R7 are grounded.
The third rectifying module and the fourth rectifying module rectify the input voltage of the standby power supply, and ensure that the input voltage input to the power factor correction module and the comparison module is direct current voltage.
Further, referring to fig. 1, 3, 6, 8 and 9, the power supply switching circuit further includes a radio frequency signal output unit, an input end of the radio frequency signal output unit is connected to an output end of the second protection unit, and an output end of the radio frequency signal output unit is connected to the cable modem; the comparing unit is connected with the radio frequency signal output unit, the comparing unit adjusts the working voltage of the radio frequency signal output unit, and the radio frequency signal output unit outputs alarm information to the cable modem.
The power supply switching circuit disclosed by the application further comprises a radio frequency signal output unit, when the main power supply works abnormally, the radio frequency signal output unit outputs an alarm signal to the cable modem to inform operation and maintenance personnel that equipment is abnormal in power supply, so that the operation and maintenance personnel can rapidly develop operation and maintenance activities, and the operation and maintenance efficiency is improved.
Further, please participate in fig. 1, fig. 3, fig. 6, fig. 8 and fig. 9, the radio frequency signal output unit includes a signal output module and a fourth protection module, an input end of the signal output module is connected with an output end of the second protection unit, and an output end of the signal output module is connected with an input end of the fourth protection module; the input end of the fourth protection module is also connected with the output end of the comparison unit, and the output end of the fourth protection module is connected with the cable modem; the comparison unit is connected with the signal output module and adjusts the working voltage of the signal output module.
In one embodiment, referring to fig. 9, the fourth protection module includes an eighteenth inductor L18, a nineteenth inductor L19, an eighth varistor M8, and a fourth gas discharge tube G4; one end of the eighteenth inductor L18 is connected with the output end of the signal output module, one end of the nineteenth inductor L19 is connected with the collector of the first triode Q1, and the other end of the eighteenth inductor L18, the other end of the nineteenth inductor L19 and one end of the fourth gas discharge tube G4 are respectively connected with the cable modem; the other end of the fourth gas discharge tube G4 is connected with one end of an eighth piezoresistor M8, and the other end of the eighth piezoresistor M8 is grounded; the fourth protection module is used for ensuring the stability of the output RF signal.
Further, referring to fig. 2, 3, 6, 7 and 8, the comparing module includes a first comparing amplifier, a second comparing amplifier, a first absorbing portion and a second absorbing portion, a pin In 2-of the second comparing amplifier is connected to an output end of the first protecting unit, a pin In2+ of the second comparing amplifier is connected to an output end of the second protecting unit, and an output end of the second comparing amplifier is connected to the second absorbing portion; the output end of the second absorption part is respectively connected with the pin In1-, the switching unit and the signal output module of the first comparison amplifier; the pin In1+ of the first comparison amplifier is connected with the output end of the voltage reduction unit, and the output end of the first comparison amplifier is connected with the first absorption part; the output end of the first absorption part is respectively connected with the signal output module and the fourth protection module; the first absorption part and the second absorption part are used for ensuring the stability of the signals output by the comparison module.
In an embodiment, referring to fig. 6, the first absorption portion includes an eleventh resistor R11, a twelfth resistor R12, a twenty-first capacitor C21, a second transient diode TVS2, and a first triode Q1, the pin Out1 of the first comparison amplifier is connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12, the other end of the eleventh resistor R11 is connected to one end of the twenty-first capacitor C21, one end of the second transient diode TVS2, and the base of the first triode Q1, the emitter of the first triode Q1, the other end of the second transient diode TVS2, the other end of the twenty-first capacitor C21, and the other end of the twelfth resistor R12 are connected to the output end of the buck module, and the collector of the first triode Q1 is connected to the signal output module.
In an embodiment, referring to fig. 6, the second absorption portion includes a nineteenth resistor R19, an eighteenth resistor R18, a twenty-second capacitor C22, a third transient diode TVS3, and a second triode Q2, a pin Out2 of the second comparison amplifier is connected to one end of the nineteenth resistor R19 and one end of the eighteenth resistor R18, the other end of the nineteenth resistor R19 is connected to one end of the twenty-second capacitor C22, one end of the third transient diode TVS3, and a base of the second triode Q2, an emitter of the second triode Q2, the other end of the third transient diode TVS3, the other end of the twenty-second capacitor C22, and the other end of the eighteenth resistor R18 are connected to an output end of the voltage reducing module, and a collector of the second triode Q2 is connected to the signal output module.
The voltage output by the collector of the first triode Q1 and the voltage output by the collector of the second triode Q2 are control voltages of the signal output module.
Further, referring to fig. 3, 6, 8 and 9, the signal output module includes a ninth diode D9, a tenth diode D10, an eleventh diode D11 and a twelfth diode D12; the output end of the first absorption part is connected with the anode of the twelfth polar tube D10 and the anode of the eleventh diode D11; the output end of the second protection unit is connected with the negative electrode of the twelfth electrode tube D10, and the negative electrode of the eleventh diode D11 is connected with the input end of the fourth protection module; the output end of the second absorption portion is connected with the positive electrode of a ninth diode D9 and the positive electrode of a twelfth diode D12, the negative electrode of the ninth diode D9 is connected with the negative electrode of the twelfth diode D10, and the negative electrode of the twelfth diode D12 is connected with the negative electrode of the eleventh diode D11.
In one embodiment, referring to fig. 8, the signal of the second protection unit is input to the signal output module and then rectified by filtering; the signals of the signal output module are also required to be subjected to filtering rectification before being output to the fourth protection module; the signal output module further comprises a twenty-third capacitor C23, an eleventh inductor L11, a twelfth inductor L12, a twenty-second resistor R22, a twenty-third resistor R23, a fifteenth inductor L15, a twenty-fifth capacitor C25, a twenty-fifth resistor R20, a twenty-first resistor R21, a twenty-sixth capacitor C26, a twenty-fourth resistor R24, and a twenty-fifth resistor R25; the collector of the first triode Q1 is respectively connected with one end of the twenty-third capacitor C23 and one end of the eleventh inductor L11, the other end of the twenty-third capacitor C23 is grounded, the other end of the eleventh inductor L11 is connected with one end of the twelfth inductor L12, and the other end of the twelfth inductor L12 is respectively connected with the positive electrode of the twelfth diode D10 and the positive electrode of the eleventh diode D11; the collector of the second triode Q2 is connected with one end of the fifteenth inductor L15, the other end of the fifteenth inductor L15 is respectively connected with one end of a twenty-second resistor R22 and one end of a twenty-third resistor R23, the other end of the twenty-second resistor R22 is respectively connected with the positive electrode of a ninth diode D9 and one end of a twenty-fifth capacitor C25, and one end of the twenty-third resistor R23 is respectively connected with the positive electrode of a twelfth diode D12 and one end of a twenty-sixth capacitor C26; the twenty-fifth capacitor C25, the twentieth resistor R20 and the twenty-first resistor R21 are connected in series, and the other end of the twenty-first resistor R21 is grounded; the twenty-sixth capacitor C26, the twenty-fourth resistor R24 and the twenty-fifth resistor R25 are connected in series, and the other end of the twenty-fifth resistor R25 is grounded.
Further, referring to fig. 10, the power supply switching circuit further includes a third protection unit, an output end of the switching unit is connected to an input end of the third protection unit, and an output end of the third protection unit is connected to the device to be powered; the third protection unit is used for ensuring the stability of the output voltage.
In one embodiment, referring to fig. 10, the third protection unit includes a third varistor M3, a third gas discharge tube G3, a third inductor L3, a fourth varistor M4, a fifth varistor M5, a sixth varistor M6, and a seventh varistor M7; the output end of the switching unit is respectively connected with one end of a sixth piezoresistor M6, one end of a seventh piezoresistor M7, one end of a fourth piezoresistor M4, one end of a fifth piezoresistor M5 and one end of a third inductor L3, the other end of the third inductor L3 is respectively connected with equipment to be charged and one end of a third gas discharge tube G3, and the other end of the third gas discharge tube G3 is connected with one end of the third piezoresistor M3; the other end of the third piezoresistor M3, the other end of the sixth piezoresistor M6, the other end of the seventh piezoresistor M7, the other end of the fourth piezoresistor M4 and the other end of the fifth piezoresistor M5 are grounded.
The invention also correspondingly provides a power supply switching system which comprises a main power supply, a standby power supply, a switching device and a cable modem, wherein the switching device comprises a PCB board, any power supply switching circuit is printed on the PCB board, the input end of the switching device is respectively connected with the main power supply and the standby power supply, and the output end of the switching device is respectively connected with the cable modem and equipment to be powered.
It will be understood that equivalents and modifications will occur to those skilled in the art based on the present invention and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention.

Claims (8)

1. The power supply switching circuit is characterized by comprising a first protection unit, a second protection unit, a switching unit and a comparison unit; the input end of the first protection unit is connected with the main power supply, and the output end of the first protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit; the input end of the second protection unit is connected with a standby power supply, the output end of the second protection unit is respectively connected with the input end of the switching unit and the input end of the comparison unit, and the output end of the switching unit is connected with equipment to be powered; the output end of the comparison unit is connected with the input end of the switching unit;
the system also comprises a radio frequency signal output unit, wherein the input end of the radio frequency signal output unit is connected with the output end of the second protection unit, and the output end of the radio frequency signal output unit is connected with the cable modem; the comparing unit is connected with the radio frequency signal output unit, the comparing unit adjusts the working voltage of the radio frequency signal output unit, and the radio frequency signal output unit outputs alarm information to the cable modem;
the radio frequency signal output unit comprises a signal output module and a fourth protection module, wherein the input end of the signal output module is connected with the output end of the second protection unit, and the output end of the signal output module is connected with the input end of the fourth protection module; the input end of the fourth protection module is also connected with the output end of the comparison unit, and the output end of the fourth protection module is connected with the cable modem; the comparison unit is connected with the signal output module and adjusts the working voltage of the signal output module.
2. The power supply switching circuit according to claim 1, wherein the comparing unit comprises a power factor correction module, a voltage reduction module and a comparing module, the input end of the power factor correction module is respectively connected with the output end of the first protecting unit and the output end of the second protecting unit, and the output end of the power factor correction module is connected with the input end of the voltage reduction module; the output end of the voltage reduction module is connected with the comparison module, the input end of the comparison module is connected with the output ends of the first protection unit and the second protection unit respectively, and the output end of the comparison module is connected with the input end of the switching unit.
3. The power supply switching circuit according to claim 2, wherein the first protection unit comprises a first rectifying module and a second rectifying module, the input end of the first rectifying module is connected with the main power supply, and the output end of the first rectifying module is connected with the input end of the power factor correction module and the input end of the switching unit respectively; the output end of the second rectifying module is connected with the input end of the comparison module.
4. The power supply switching circuit according to claim 2, wherein the second protection unit comprises a third rectifying module and a fourth rectifying module, the input end of the third rectifying module is connected with the standby power supply, and the output end of the third rectifying module is respectively connected with the input end of the power factor correction module and the input end of the switching unit; the output end of the fourth rectifying module is connected with the input end of the comparison module.
5. The power supply switching circuit according to claim 2, wherein the comparing module comprises a first comparing amplifier, a second comparing amplifier, a first absorbing part and a second absorbing part, wherein a pin In 2-of the second comparing amplifier is connected with an output end of the first protecting unit, a pin In2+ of the second comparing amplifier is connected with an output end of the second protecting unit, and an output end of the second comparing amplifier is connected with the second absorbing part; the output end of the second absorption part is respectively connected with the pin In1-, the switching unit and the signal output module of the first comparison amplifier; the pin In1+ of the first comparison amplifier is connected with the output end of the voltage reduction unit, and the output end of the first comparison amplifier is connected with the first absorption part; the output end of the first absorption part is respectively connected with the signal output module and the fourth protection module.
6. The power supply switching circuit according to claim 5, wherein the signal output module includes a ninth diode D9, a tenth diode D10, an eleventh diode D11, and a twelfth diode D12; the output end of the first absorption part is connected with the anode of the twelfth polar tube D10 and the anode of the eleventh diode D11; the output end of the second protection unit is connected with the negative electrode of the twelfth electrode tube D10, and the negative electrode of the eleventh diode D11 is connected with the input end of the fourth protection module; the output end of the second absorption portion is connected with the positive electrode of a ninth diode D9 and the positive electrode of a twelfth diode D12, the negative electrode of the ninth diode D9 is connected with the negative electrode of the twelfth diode D10, and the negative electrode of the twelfth diode D12 is connected with the negative electrode of the eleventh diode D11.
7. The power supply switching circuit according to claim 1, further comprising a third protection unit, wherein an output terminal of the switching unit is connected to an input terminal of the third protection unit, and an output terminal of the third protection unit is connected to the device to be powered.
8. A power supply switching system comprising a main power supply, a standby power supply, a switching device and a cable modem, wherein the switching device comprises a PCB board, the power supply switching circuit as claimed in any one of claims 1 to 7 is printed on the PCB board, the input end of the switching device is connected with the main power supply and the standby power supply respectively, and the output end of the switching device is connected with the cable modem and the equipment to be powered respectively.
CN202011474514.2A 2020-12-15 2020-12-15 Power supply switching circuit and power supply switching system Active CN112583107B (en)

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RU2318281C1 (en) * 2006-11-13 2008-02-27 Общество с ограниченной ответственностью "Технологическая лаборатория" Computerized system for no-break power supply to stationary equipment
CN104684152A (en) * 2013-11-28 2015-06-03 深圳市海洋王照明工程有限公司 Emergency light control circuit and lamp
CN106026358A (en) * 2016-06-23 2016-10-12 京东方科技集团股份有限公司 Automatic power supply switching apparatus and method, and power supply system
CN106300649A (en) * 2016-10-28 2017-01-04 武汉长光科技有限公司 Communication equipment dual power supply automatic switch-over circuit device
CN209642395U (en) * 2019-05-09 2019-11-15 河南栖默电气设备有限公司 A kind of double power supply converting switch and power-supply system
CN111969715A (en) * 2020-10-21 2020-11-20 深圳市超力源科技有限公司 Main and standby power supply seamless switching circuit and method of fire-fighting broadcast system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2318281C1 (en) * 2006-11-13 2008-02-27 Общество с ограниченной ответственностью "Технологическая лаборатория" Computerized system for no-break power supply to stationary equipment
CN104684152A (en) * 2013-11-28 2015-06-03 深圳市海洋王照明工程有限公司 Emergency light control circuit and lamp
CN106026358A (en) * 2016-06-23 2016-10-12 京东方科技集团股份有限公司 Automatic power supply switching apparatus and method, and power supply system
CN106300649A (en) * 2016-10-28 2017-01-04 武汉长光科技有限公司 Communication equipment dual power supply automatic switch-over circuit device
CN209642395U (en) * 2019-05-09 2019-11-15 河南栖默电气设备有限公司 A kind of double power supply converting switch and power-supply system
CN111969715A (en) * 2020-10-21 2020-11-20 深圳市超力源科技有限公司 Main and standby power supply seamless switching circuit and method of fire-fighting broadcast system

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