CN211630472U - Power supply circuit of wisdom street lamp watch-dog - Google Patents
Power supply circuit of wisdom street lamp watch-dog Download PDFInfo
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- CN211630472U CN211630472U CN201922497682.2U CN201922497682U CN211630472U CN 211630472 U CN211630472 U CN 211630472U CN 201922497682 U CN201922497682 U CN 201922497682U CN 211630472 U CN211630472 U CN 211630472U
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a power supply circuit of a smart street lamp monitor, which comprises an EMC circuit, a rectification filter circuit, an RCD clamping circuit, a half-wave rectifying circuit, another half-wave rectifying circuit, a voltage reduction circuit, a feedback signal processing circuit, a PWM switch driver, a switch tube and an isolation transformer; the EMC circuit is connected with the rectifying and filtering circuit, the rectifying and filtering circuit is connected with the RCD clamping circuit, the RD clamping circuit is connected with one end of the switching tube, the RCD clamping circuit is connected with the half-wave rectifying circuit and the other half-wave rectifying circuit through the isolation transformer, the half-wave rectifying circuit is connected with the voltage reduction circuit, the other half-wave rectifying circuit is connected with the feedback circuit, the feedback circuit is connected with the feedback signal processing circuit, the feedback signal processing circuit is connected with the PWM switch driver, and the PWM switch driver is connected with the control end of the switching tube; the utility model provides a street lamp management is more intelligent, also makes the power supply circuit of wisdom street lamp watch-dog that each terminal equipment work more reliable and more stable.
Description
Technical Field
The utility model relates to a street lamp technical field, more specifically the theory that says so, it relates to a power supply circuit of wisdom street lamp watch-dog.
Background
Wisdom street lamp is the important component part in future wisdom city, and its advantage lies in bearing the function of illumination in addition, still bears the function in other wisdom cities, for example the wisdom street lamp is gone up the loading and is filled equipment such as electric pile, 5G basic station, WIFI communications facilities, information issue screen, environmental monitoring. These devices are all cross-industry devices, and if they are integrated on a street lamp system, great difficulty is brought to maintenance work, so that maintenance cost is increased. This is very unfavorable in the popularization of wisdom street lamp, is a bottleneck and the obstacle of present wisdom street lamp popularization.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides the street lamp management more intelligent, also makes the power supply circuit of a wisdom street lamp watch-dog that each terminal equipment work more reliable and more stable.
The technical scheme of the utility model as follows:
a power supply circuit of a smart street lamp monitor comprises an EMC circuit, a rectifying and filtering circuit, an RCD clamping circuit, a half-wave rectifying circuit, another half-wave rectifying circuit, a voltage reducing circuit, a feedback signal processing circuit, a PWM switch driver, a switch tube and an isolation transformer; EMC circuit is connected with rectification filter circuit, rectification filter circuit is connected with RCD clamp circuit, RD clamp circuit is connected with the one end of switch tube, RCD clamp circuit passes through isolation transformer and is connected with half-wave rectifier circuit, another half-wave rectifier circuit, half-wave rectifier circuit is connected with step-down circuit, another half-wave rectifier circuit is connected with feedback circuit, feedback circuit is connected with feedback signal processing circuit, feedback signal processing circuit is connected with PWM switch driver, PWM switch driver is connected with the control end of switch tube.
Further, the EMC circuit includes a fuse F701, a thermistor RT701, a capacitor X701, and a common mode inductor L701; the fuse F701 is connected with a live wire, the other end of the fuse F701 is connected with a thermistor RT701, a capacitor X701 and a common mode inductor L701 are connected between the other end of the thermistor RT701 and a zero line, the capacitor X701 and the common mode inductor L701 are connected in parallel, two ends of the common mode inductor L701 are connected with two ends of the capacitor X701, and the other two ends of the common mode inductor L701 are connected with a rectifying and filtering circuit.
Further, the rectifying and filtering circuit comprises a diode D701, a diode D702, a diode D703, a diode D704 and a capacitor C701; the diode D701 is connected with the diode D702 in series, the diode D703 is connected with the diode D704 in series, and a circuit formed by the diode D701 and the diode D702, a circuit formed by the diode D703 and the diode D704 and the capacitor C701 are connected in parallel; one end of the other two ends of the common mode inductor L701 is connected between the diode D701 and the diode D702, and the other end of the other two ends of the common mode inductor L701 is connected between the diode D703 and the diode D704; one end of the capacitor C701 is connected with the RCD clamping circuit, and the other end of the capacitor C701 is connected with one end of the switching tube Q701.
Further, the RCD clamp circuit includes a capacitor C702, a resistor R701, and a diode D705, one end of the capacitor C702 and one end of the resistor R701 are connected to one end of the capacitor C701, the other end of the resistor R701 is connected to a negative electrode of the diode D705, an anode of the diode D705 is connected to a dotted end of the primary coil of the isolation transformer T701, and one end of the resistor R701 is connected to a dotted end of the primary coil of the isolation transformer T701;
one end of the switching tube Q701 is connected with the positive electrode of the diode D705, the other end of the switching tube Q701 is connected with the other end of the capacitor C702, and the control end of the switching tube Q701 is connected with the PWM switching driver.
Furthermore, pins of a first group of secondary coils and a second group of secondary coils of the isolation transformer T701 are respectively connected with the half-wave rectification circuit and the other half-wave rectification circuit; the half-wave rectification circuit comprises a diode D706 and a capacitor C703, wherein the cathode of the diode D706 is connected with one end of the capacitor C703; the other half-wave rectifying circuit comprises a diode D708 and a capacitor C704, wherein the cathode of the diode D708 is connected with one end of the capacitor C704; the anode of the diode D706 is connected with the dotted end of the first group of secondary coils of the isolation transformer T701, the other end of the capacitor C703 is connected with the synonym end of the first group of secondary coils of the isolation transformer T701, the anode of the diode D708 is connected with the dotted end of the second group of secondary coils of the isolation transformer T701, the other end of the capacitor C704 is connected with the synonym end of the second group of secondary coils of the isolation transformer T701, the two ends of the capacitor C703 are used as first output ports, and the two ends of the capacitor C704 are used as third output ports;
the half-wave rectification circuit is connected with the voltage reduction circuit; the voltage reduction circuit comprises a resistor R709, a triode Q702, a voltage stabilizing diode D707 and a capacitor C707, wherein one end of the capacitor C703 is connected with a collector of the triode Q702 and one end of the point resistor R709, a base of the triode Q702 is connected with the other end of the resistor R709 and a cathode of the voltage stabilizing diode D707, an emitter of the triode Q702 is connected with one end of the capacitor C707, the other end of the capacitor C707 is connected with an anode of the voltage stabilizing diode D707 and the other end of the capacitor C703, and two ends of the capacitor C707 serve as second output ports;
the other half-wave rectifying circuit is connected with a feedback circuit, the feedback circuit comprises a resistor R702, a resistor R703, a resistor R704, a resistor R705, an optical coupler U702, an error amplifier U701 and a capacitor C705, one end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R702 and one end of the resistor R705, the other end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R703, the other end of the resistor R703 is connected with the negative input end of the error amplifier U701 at the other end of the resistor R702 and one end of the resistor R704, the other end of the resistor R704 is connected with one end of the capacitor C705, the other end of the capacitor C705 is connected with the cathode end of the optical coupler U702 and the output end of the error amplifier U701; wherein the positive input of the error amplifier U701 is connected to a reference voltage Ref.
Further, the feedback circuit is connected with the feedback signal processing circuit in an isolated mode through an optical coupler U702, the feedback signal processing circuit comprises a resistor R706, a resistor R707, a resistor R708, a capacitor C706, an amplifier U703 and a comparator U704, an emitter of the optical coupler U702 is connected with one end of the resistor R707, one end of the resistor R708 and a negative input end of the amplifier U703, the other end of the resistor R707 is grounded, the other end of the resistor R708 is connected with the capacitor C706, the other end of the capacitor C706 is connected with an output end of the amplifier U703 and a positive input end of the comparator U704, and an output end of the comparator U704 is connected with the PWM switch driver. The positive input of the amplifier U703 is connected to a reference voltage of 2.5V. The negative input end of the comparator inputs a triangular wave signal.
The utility model has the advantages of wide applicability, low cost and easy popularization and application. The utility model discloses a power supply circuit of wisdom street lamp watch-dog is to street lamp in the system, fill electric pile, display, camera, urgent video intercommunication, audio amplifier, 5G basic station, cooling fan, environmental monitoring module, serial servers, switch, POE, light cat, router, NB-IoT module, DTU module carry out power supply's control to this judges whether each terminal equipment operation is normal. In addition, aiming at abnormal mains supply voltage, the power supply switch of each device can be turned off in time, and the device is prevented from being damaged.
Drawings
FIG. 1 is a connection diagram of the intelligent street lamp monitor of the present invention;
fig. 2 is a schematic block diagram of the intelligent street lamp monitor of the present invention;
fig. 3 is a circuit diagram of the terminal interface of the present invention;
fig. 4 is a clock circuit diagram of the present invention;
fig. 5 is a circuit diagram of the data transmission circuit of the present invention;
FIG. 6 is a power supply circuit diagram of the present invention;
fig. 7 is a circuit diagram of the display module of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the following detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1:
a power circuit of a smart street lamp monitor comprises an EMC circuit, a rectifying and filtering circuit, an RCD clamping circuit, a half-wave rectifying circuit, another half-wave rectifying circuit, a voltage reducing circuit, a feedback signal processing circuit, a PWM switch driver, a switch tube and an isolation transformer; EMC circuit is connected with rectification filter circuit, rectification filter circuit is connected with RCD clamp circuit, RD clamp circuit is connected with the one end of switch tube, RCD clamp circuit passes through isolation transformer and is connected with half-wave rectifier circuit, another half-wave rectifier circuit, half-wave rectifier circuit is connected with step-down circuit, another half-wave rectifier circuit is connected with feedback circuit, feedback circuit is connected with feedback signal processing circuit, feedback signal processing circuit is connected with PWM switch driver, PWM switch driver is connected with the control end of switch tube.
The EMC circuit comprises a fuse F701, a thermistor RT701, a capacitor X701 and a common mode inductor L701; the fuse F701 is connected with a live wire, the other end of the fuse F701 is connected with a thermistor RT701, a capacitor X701 and a common mode inductor L701 are connected between the other end of the thermistor RT701 and a zero line, the capacitor X701 and the common mode inductor L701 are connected in parallel, two ends of the common mode inductor L701 are connected with two ends of the capacitor X701, and the other two ends of the common mode inductor L701 are connected with a rectifying and filtering circuit;
the rectification filter circuit comprises a diode D701, a diode D702, a diode D703, a diode D704 and a capacitor C701; the diode D701 is connected with the diode D702 in series, the diode D703 is connected with the diode D704 in series, and a circuit formed by the diode D701 and the diode D702, a circuit formed by the diode D703 and the diode D704 and the capacitor C701 are connected in parallel; one end of the other two ends of the common mode inductor L701 is connected between the diode D701 and the diode D702, and the other end of the other two ends of the common mode inductor L701 is connected between the diode D703 and the diode D704; one end of the capacitor C701 is connected with the RCD clamping circuit, and the other end of the capacitor C701 is connected with one end of the switching tube Q701;
the RCD clamping circuit comprises a capacitor C702, a resistor R701 and a diode D705, one end of the capacitor C702 and one end of the resistor R701 are connected with one end of the capacitor C701, the other end of the resistor R701 is connected with the cathode of the diode D705, the anode of the diode D705 is connected with the dotted end of the primary coil of the isolation transformer T701, and one end of the resistor R701 is connected with the dotted end of the primary coil of the isolation transformer T701;
one end of a switching tube Q701 is connected with the anode of a diode D705, the other end of the switching tube Q701 is connected with the other end of a capacitor C702, and the control end of the switching tube Q701 is connected with a PWM (pulse-width modulation) switch driver;
pins of a first group of secondary coils and a second group of secondary coils of the isolation transformer T701 are respectively connected with the half-wave rectification circuit and the other half-wave rectification circuit; the half-wave rectification circuit comprises a diode D706 and a capacitor C703, wherein the cathode of the diode D706 is connected with one end of the capacitor C703; the other half-wave rectifying circuit comprises a diode D708 and a capacitor C704, wherein the cathode of the diode D708 is connected with one end of the capacitor C704; the anode of the diode D706 is connected with the dotted end of the first group of secondary coils of the isolation transformer T701, the other end of the capacitor C703 is connected with the synonym end of the first group of secondary coils of the isolation transformer T701, the anode of the diode D708 is connected with the dotted end of the second group of secondary coils of the isolation transformer T701, the other end of the capacitor C704 is connected with the synonym end of the second group of secondary coils of the isolation transformer T701, the two ends of the capacitor C703 are used as first output ports, and the two ends of the capacitor C704 are used as third output ports;
the half-wave rectification circuit is connected with the voltage reduction circuit; the voltage reduction circuit comprises a resistor R709, a triode Q702, a voltage stabilizing diode D707 and a capacitor C707, wherein one end of the capacitor C703 is connected with a collector of the triode Q702 and one end of the point resistor R709, a base of the triode Q702 is connected with the other end of the resistor R709 and a cathode of the voltage stabilizing diode D707, an emitter of the triode Q702 is connected with one end of the capacitor C707, the other end of the capacitor C707 is connected with an anode of the voltage stabilizing diode D707 and the other end of the capacitor C703, and two ends of the capacitor C707 serve as second output ports;
the other half-wave rectifying circuit is connected with a feedback circuit, the feedback circuit comprises a resistor R702, a resistor R703, a resistor R704, a resistor R705, an optical coupler U702, an error amplifier U701 and a capacitor C705, one end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R702 and one end of the resistor R705, the other end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R703, the other end of the resistor R703 is connected with the negative input end of the error amplifier U701 at the other end of the resistor R702 and one end of the resistor R704, the other end of the resistor R704 is connected with one end of the capacitor C705, the other end of the capacitor C705 is connected with the cathode end of the optical coupler U702 and the output end of the error amplifier U701; wherein the positive input terminal of the error amplifier U701 is connected to a reference voltage Ref;
the feedback circuit is connected with the feedback signal processing circuit in an isolated mode through an optical coupler U702, the feedback signal processing circuit comprises a resistor R706, a resistor R707, a resistor R708, a capacitor C706, an amplifier U703 and a comparator U704, an emitter of the optical coupler U702 is connected with one end of the resistor R707, one end of the resistor R708 and a negative input end of the amplifier U703, the other end of the resistor R707 is grounded, the other end of the resistor R708 is connected with the capacitor C706, the other end of the capacitor C706 is connected with an output end of the amplifier U703 and a positive input end of the comparator U704, and an output end of the comparator U704 is connected with the PWM switch driver. The positive input of the amplifier U703 is connected to a reference voltage of 2.5V. The negative input end of the comparator inputs a triangular wave signal.
Power supply circuit of wisdom street lamp watch-dog is to street lamp in the system, fill electric pile, display, camera, urgent video intercom, audio amplifier, 5G basic station, cooling fan, environmental monitoring module, serial servers, switch, POE, light cat, router, NB-IoT module, DTU module carry out power supply's control to this judges whether each terminal equipment operation is normal. In addition, aiming at abnormal mains supply voltage, the power supply switch of each device can be turned off in time, and the device is prevented from being damaged.
Example 2:
as shown in fig. 1 to 7, a smart street lamp monitoring system comprises a street lamp, a charging pile, a display, a camera, an emergency video intercom, a sound box, a 5G base station, a cooling fan, an environment monitoring module, a serial port server, a switch, POE, a photo cat, a router, an NB-IoT module, a DTU module, an AP and a smart street lamp monitor, wherein the street lamp, the charging pile, the display, the camera, the emergency video intercom, the sound box, the 5G base station, the cooling fan, the environment monitoring, the serial port server, the switch, the POE, the photo cat is connected with the smart street lamp monitor through a power line, the router, the NB-IoT module, the DTU module is connected with the smart street lamp monitor through a power line and a signal line, the charging pile, the display, the camera, the emergency video intercom, the sound box, the serial port server, the router is connected with the switch through a signal line, the environment monitoring module is connected with the serial port, POE passes through the signal line with AP, router and is connected, and the router passes through the signal line with the light cat and is connected.
Wisdom street lamp watch-dog is to the street lamp, fill electric pile, display, camera, urgent video intercom, audio amplifier, 5G basic station, cooling fan, environmental monitoring module, serial servers, switch, POE, light cat, router, NB-IoT module, DTU module carry out power supply's control to this judges whether each terminal equipment operation is normal. In addition, aiming at abnormal mains supply voltage, the power supply switch of each device can be turned off in time, and the device is prevented from being damaged.
The intelligent street lamp monitor is connected with the router, is connected with the Internet through the optical modem and is used for reporting information to the server; when the optical modem is abnormally disconnected, the intelligent street lamp monitor is connected to an NB-IoT, 2G/4G wireless network or other public network communication and server for communication through standby channels such as the NB-IoT module or the DTU module. The intelligent street lamp monitor accesses the network connection state of each device in the intelligent street lamp local area network through the router. Finally, monitor each equipment power supply and network through installation watch-dog in wisdom street lamp, realize the centralized management to wisdom street lamp.
The intelligent street lamp monitor comprises a control circuit, a power supply circuit, a clock circuit, an NB-IoT interface, a DTU interface, a network interface, a terminal interface and a data transmission circuit; the control circuit adopts a singlechip and is connected with a clock circuit, a power circuit, an NB-IoT interface, a DTU interface, a network interface, a terminal interface and a data transmission circuit; the terminal interface and the power circuit are connected with the data transmission circuit; the terminal interface is connected with the power circuit; the control circuit monitors the power supply condition of each device in the intelligent street lamp monitoring system through the terminal interface, is connected to the Internet through the network interface, and accesses the network state of each device in the intelligent street lamp monitoring system.
The power supply circuit supplies power for the control circuit, the clock circuit, the data transmission circuit, the terminal interface, the network interface, the DTU interface, the NB-IoT interface and the like, and can adapt to wide-range input voltage.
The clock circuit provides clock/calendar information to the system. The data transmission circuit is a conversion circuit for communicating the ammeter module of each terminal interface with the singlechip of the control circuit. The terminal interface is used for connecting the alternating current input end of each terminal device. The network interface connects to the router and provides it with access to the network. The control circuit is also connected with the network through the network interface and accesses the network connection state of each device in the system.
The NB-IoT interface is used for connecting the NB-IoT communication equipment; in the event of a fiber or DTU outage, the network is connected through the NB-IoT device. The DTU interface is used for connecting the DTU module and connecting a network through DTU equipment under the condition of fiber or NB-IoT disconnection.
The system also comprises a human-computer interaction interface for human-computer interaction; the LED display screen comprises a single chip microcomputer U41, a memory chip U42, a display screen U43, a resistor R41, a resistor R42, a capacitor C41, a resistor R43, a triode Q41, a resistor R43 and keys K41-K416.
The intelligent street lamp monitor can display power supply information and network connection information of each device on a human-computer interface or send the power supply information and the network connection information to the server platform. The man-machine interface of wisdom street lamp watch-dog can set up terminal equipment's the time of going up and down to power. The working condition information of each terminal device can be checked, wherein the working condition information comprises power supply information, power-on information, power-off information, network connection information, abnormal working information, work log query and the like, and the functions can be realized by adopting conventional programming. Maintenance personnel can easily judge which terminal is abnormal according to the human-computer interface information or the server platform information, and then change and maintain, so that the problem troubleshooting time is greatly shortened. The maintenance efficiency of wisdom street lamp has been improved.
Specifically, the specific circuit of the terminal interface comprises an input end, an output end, a metering circuit and a switch circuit, wherein a zero line and a ground line of the input end are respectively connected with a zero line and a ground line of the output end, a live line of the input end and a live line of the output end are respectively connected with the metering circuit and the switch circuit, and the metering circuit is connected with the switch circuit. The input end adopts an aviation socket. The commercial power is connected to the input end of the terminal interface circuit and is provided for the terminal equipment through the output end of the terminal interface circuit, and the switch in the terminal interface circuit is controlled through the single chip of the control circuit, so that the power utilization management of the terminal equipment is realized. And the metering circuit in each terminal interface is used for monitoring the power supply condition of each terminal device. Then the data is transmitted to the control circuit through the data transmission circuit, and the control circuit judges the operation state of each terminal device. The electricity consumption information of the terminal equipment connected with the monitoring output end of the metering circuit comprises information such as voltage, current, power factor, electricity consumption and the like.
The metering circuit comprises an electric meter module U301, a capacitor C301, a resistor R301 and a resistor R302, wherein the capacitor C301 is connected between a V + pin and a V-pin of the electric meter module U301, and a TX pin and an RX pin of the electric meter module U301 are respectively connected with one ends of the resistor R301 and the resistor R302 and are connected with corresponding interfaces on a single chip microcomputer of the control circuit; the other ends of the resistor R301 and the resistor R302 are connected with VCC; an L-IN pin and an N-IN pin of the electric meter module U301 are respectively connected with a live wire and a zero wire of the input end, and an L-OUT pin of the electric meter module U301 is connected with the switch circuit.
The switch circuit comprises a relay U302, a diode D301, a triode Q301 and a resistor R303, one end of the relay U302 is connected with an L-OUT pin of an ammeter module U301, the other end of the relay U302 is connected with a live wire of an output end, two ends of a coil of the relay U302 are connected with the diode D301 in parallel, a cathode of the diode D301 is connected with VCC, an anode of the diode D301 is connected with a collector of the triode Q301, a base of the triode Q301 is connected with the resistor R303, an emitting electrode of the triode Q301 is grounded, and the other end of the resistor R303 is connected with a corresponding interface ON a singlechip of the control circuit as ON/OFF. When the singlechip outputs high level, the triode Q301 is closed. The relay U302 is connected, and the output end is connected with the live wire of the input end.
The clock circuit comprises a chip ISL1208, a capacitor C51, a capacitor C52, a diode D51 and a crystal oscillator Y51; the SDA and SCL pins of the chip ISL1208 are connected with a single chip microcomputer in the control circuit for communication, a crystal oscillator Y51 is connected between the X1 pin and the X2 pin of the chip ISL1208, the VCC pin of the chip ISL1208 is connected with the positive electrodes of the capacitor C52 and the diode D51 to VCC, the VBAT pin of the chip ISL1208 is connected with the negative electrode of the diode D51 and the capacitor C51, and the other end of the capacitor C51 is grounded.
The data transmission circuit comprises a master control transmission module and terminal transmission modules, the number of the terminal transmission modules is consistent with that of terminal equipment, the master control transmission module is connected with the terminal transmission modules, RXD, TXD and CS wiring in the master control transmission module is connected to a single chip microcomputer of the control circuit, RXD1, RXD2 … RXDn, TXD1 and TXD2 … TXDn wiring in the terminal transmission modules are connected to serial ports of ammeter modules in each terminal interface;
the main control transmission module comprises a chip U602, a TVS transient suppression diode D604, a TVS transient suppression diode D605, a TVS transient suppression diode D606, a resistor R608, a resistor R609, a resistor R610, a resistor R611, a resistor R612, a capacitor C602, a capacitor C603, a capacitor C604 and a capacitor C605; a resistor R608 and a TVS transient suppression diode D605 are connected between the No. 7 pin and the No. 6 pin of the chip U602, the TVS transient suppression diode D605 is connected with the resistor R608 in parallel, the No. 7 pin of the chip U602 is connected with one end of the TVS transient suppression diode D604 and one end of the resistor R609, and the other end of the TVS transient suppression diode D604 and the other end of the resistor R609 are grounded together; a No. 6 pin of the chip U602 is connected with one end of the TVS transient suppression diode D606 and one end of the resistor R610, and the other end of the TVS transient suppression diode D606 and the other end of the resistor R610 are connected with VCC together; pin 5 of the chip U602 is grounded, and pin 4 of the chip U602 is connected with one end of the resistor R612 and one end of the capacitor C604 and used as a TXD connection wire; a No. 1 pin of the chip U602 is connected with one end of the resistor R611 and one end of the capacitor C603 and is used as RXD wiring; the other end of the capacitor C603 and the other end of the capacitor C604 are grounded together with one end of the capacitor C605, the other end of the resistor R611 and the other end of the resistor R612 are connected with VCC together with the other end of the capacitor C605, pins No. 2 and No. 3 of the chip U602 are used as CS connection wires, pin No. 8 of the chip U602 is connected with VCC together with one end of the capacitor C602, and the other end of the capacitor C602 is grounded;
the terminal transmission module comprises a chip U601, a TVS transient suppression diode D602, a TVS transient suppression diode D603, a resistor R601, a resistor R602, a resistor R603, a resistor R604, a resistor R605, a resistor R606, a resistor R607, a capacitor C601 and a triode Q601; the pin No. 1 of the chip U601 is used as RXD wiring and is connected with a resistor R604, the other end of the resistor R604, one end of a resistor R603, one end of the resistor R601, the pin No. 8 of the chip U601 and a capacitor C601 are connected with VCC together, and the other end of the capacitor C601 is grounded; the other end of the resistor R601 is used as a TXD wiring and is connected with one end of the resistor R602, the other end of the resistor R603 is connected with a collector of the triode Q601 and pins No. 2 and No. 3 of the chip U601, a base of the triode Q601 is connected with the other end of the resistor R602, and an emitter of the triode Q601 is grounded together with a pin No. 4 of the chip U601; pin No. 5 of the chip U601 is grounded; a TVS transient suppression diode D602 and a resistor R607 are connected between pins No. 6 and No. 7 of the chip U601, the TVS transient suppression diode D602 and the resistor R607 are connected in parallel, the pin No. 6 of the chip U601 is connected with one end of a resistor R606 and one end of a TVS transient suppression diode D603, and the other end of the resistor R606 and the other end of the TVS transient suppression diode D603 are connected with VCC; pin No. 7 of the chip U601 is connected to one end of the resistor R605 and one end of the TVS transient suppression diode D601, and the other end of the resistor R605 and the other end of the TVS transient suppression diode D601 are grounded.
The chips U601 and U602 adopt MAX3485 chips. The circuit communicates with n (wherein n < ═ 32) terminal interfaces through three pins of a control circuit singlechip.
The power supply circuit comprises an EMC circuit, a rectifying and filtering circuit, an RCD clamping circuit, a half-wave rectifying circuit, another half-wave rectifying circuit, a voltage reduction circuit, a feedback signal processing circuit, a PWM switch driver, a switch tube and an isolation transformer; the EMC circuit is connected with the rectification filter circuit, the rectification filter circuit is connected with the RCD clamping circuit and the switch tube, the RCD clamping circuit is connected with the half-wave rectification circuit and the other half-wave rectification circuit through the isolation transformer, the half-wave rectification circuit is connected with the voltage reduction circuit, the other half-wave rectification circuit is connected with the feedback circuit, the feedback circuit is connected with the feedback signal processing circuit, the feedback signal processing circuit is connected with the PWM switch driver, and the PWM switch driver is connected with the switch tube.
The EMC circuit comprises a fuse F701, a thermistor RT701, a capacitor X701 and a common mode inductor L701; the fuse F701 is connected with a live wire, the other end of the fuse F701 is connected with a thermistor RT701, a capacitor X701 and a common mode inductor L701 are connected between the other end of the thermistor RT701 and a zero line, the capacitor X701 and the common mode inductor L701 are connected in parallel, two ends of the common mode inductor L701 are connected to two ends of the capacitor X701, and the other two ends of the common mode inductor L701 are connected with a rectifying and filtering circuit;
the rectification filter circuit comprises a diode D701, a diode D702, a diode D703, a diode D704 and a capacitor C701; the diode D701 is connected with the diode D702 in series, the diode D703 is connected with the diode D704 in series, and a circuit formed by the diode D701 and the diode D702, a circuit formed by the diode D703 and the diode D704 and the capacitor C701 are connected in parallel; one end of the other two ends of the common mode inductor L701 is connected between the diode D701 and the diode D702, and the other end of the other two ends of the common mode inductor L701 is connected between the diode D703 and the diode D704; one end of the capacitor C701 is connected with the RCD clamping circuit, and the other end of the capacitor C701 is connected with the switching tube Q701;
the RCD clamping circuit comprises a capacitor C702, a resistor R701 and a diode D705, one end of the capacitor C702 and one end of the resistor R701 are connected with one end of the capacitor C701 and the different-name end of the primary coil of the isolation transformer T701, the other end of the resistor R701 is connected with the cathode of the diode D705, and the anode of the diode D705 is connected with the same-name end of the primary coil of the isolation transformer T701;
one end of a switching tube Q701 is connected with the anode of a diode D705, the other end of the switching tube Q701 is connected with the other end of a capacitor C701, and the control end of the switching tube Q701 is connected with a PWM switch driver;
a first group of secondary coils and a second group of secondary coils of the isolation transformer T701 are connected with a half-wave rectification circuit and another half-wave rectification circuit; the half-wave rectification circuit comprises a diode D706 and a capacitor C703, wherein the cathode of the diode D706 is connected with one end of the capacitor C703; the anode of the diode D706 is connected to the dotted terminal of the first set of secondary windings, and the other terminal of the capacitor C703 is connected to the dotted terminal of the first set of secondary windings. The other half-wave rectifying circuit comprises a diode D708 and a capacitor C704, wherein the cathode of the diode D708 is connected with one end of the capacitor C704; the anode of the diode D708 is connected with the homonymous end of the second group of secondary coils, the other end of the capacitor C704 is connected with the synonym end of the second group of secondary coils, two ends of the capacitor C703 are used as a first output port, and two ends of the capacitor C704 are used as a third output port;
the half-wave rectification circuit is connected with the voltage reduction circuit; the voltage reduction circuit comprises a resistor R709, a triode Q702, a voltage stabilizing diode D707 and a capacitor C707, wherein one end of the capacitor C703 is connected with a collector of the triode Q702 and one end of the resistor R709, a base of the triode Q702 is connected with the other end of the resistor R709 and a cathode of the voltage stabilizing diode D707, an emitter of the triode Q702 is connected with one end of the capacitor C707, the other end of the capacitor C707 is connected with an anode of the voltage stabilizing diode D707 and the other end of the capacitor C703, and two ends of the capacitor C707 serve as second output ports;
the other half-wave rectifying circuit is connected with a feedback circuit, the feedback circuit comprises a resistor R702, a resistor R703, a resistor R704, a resistor R705, an optical coupler U702, an error amplifier U701 and a capacitor C705, one end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R702 and one end of the resistor R705, the other end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R703, the other end of the resistor R703 is connected with the other end of the resistor R702, the negative input end of the error amplifier U701 and one end of the resistor R704, the other end of the resistor R704 is connected with one end of the capacitor C705, the other end of the capacitor C705 is connected with the cathode end of the optical coupler U702 and the output end of the error amplifier U701, and; wherein the positive input end of the error amplifier is connected with a reference voltage Ref;
the feedback circuit is connected with the feedback signal processing circuit in an isolated mode through an optical coupler U702, the feedback signal processing circuit comprises a resistor R706, a resistor R707, a resistor R708, a capacitor C706, an amplifier U703 and a comparator U704, the transmitting end of the optical coupler U702 is connected with one end of the resistor R707, one end of the resistor R708 and the negative input end of the amplifier U703, the other end of the resistor R707 is grounded, the other end of the resistor R708 is connected with the capacitor C706, the other end of the capacitor C706 is connected with the output end of the amplifier U703 and the positive input end of the comparator U704, and the output end of the comparator U704 is connected with the PWM switch driver. The positive input of the amplifier U703 is connected to a reference voltage of 2.5V. The negative input terminal of the comparator U704 inputs the triangular wave signal. The design realizes the adaptive power supply of a large range of power supplies.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the concept of the present invention, and these improvements and decorations should also be considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides a power supply circuit of wisdom street lamp watch-dog which characterized in that: the power supply circuit comprises an EMC circuit, a rectifying and filtering circuit, an RCD clamping circuit, a half-wave rectifying circuit, another half-wave rectifying circuit, a voltage reduction circuit, a feedback signal processing circuit, a PWM switch driver, a switch tube and an isolation transformer; EMC circuit is connected with rectification filter circuit, rectification filter circuit is connected with RCD clamp circuit, RD clamp circuit is connected with the one end of switch tube, RCD clamp circuit passes through isolation transformer and is connected with half-wave rectifier circuit, another half-wave rectifier circuit, half-wave rectifier circuit is connected with step-down circuit, another half-wave rectifier circuit is connected with feedback circuit, feedback circuit is connected with feedback signal processing circuit, feedback signal processing circuit is connected with PWM switch driver, PWM switch driver is connected with the control end of switch tube.
2. The power supply circuit of the intelligent street lamp monitor as claimed in claim 1, wherein: the EMC circuit comprises a fuse F701, a thermistor RT701, a capacitor X701 and a common mode inductor L701; the fuse F701 is connected with a live wire, the other end of the fuse F701 is connected with a thermistor RT701, a capacitor X701 and a common mode inductor L701 are connected between the other end of the thermistor RT701 and a zero line, the capacitor X701 and the common mode inductor L701 are connected in parallel, two ends of the common mode inductor L701 are connected with two ends of the capacitor X701, and the other two ends of the common mode inductor L701 are connected with a rectifying and filtering circuit.
3. The power supply circuit of the intelligent street lamp monitor as claimed in claim 1, wherein: the rectification filter circuit comprises a diode D701, a diode D702, a diode D703, a diode D704 and a capacitor C701; the diode D701 is connected with the diode D702 in series, the diode D703 is connected with the diode D704 in series, and a circuit formed by the diode D701 and the diode D702, a circuit formed by the diode D703 and the diode D704 and the capacitor C701 are connected in parallel; one end of the other two ends of the common mode inductor L701 is connected between the diode D701 and the diode D702, and the other end of the other two ends of the common mode inductor L701 is connected between the diode D703 and the diode D704; one end of the capacitor C701 is connected with the RCD clamping circuit, and the other end of the capacitor C701 is connected with one end of the switching tube Q701.
4. The power supply circuit of the intelligent street lamp monitor as claimed in claim 1, wherein: the RCD clamping circuit comprises a capacitor C702, a resistor R701 and a diode D705, one end of the capacitor C702 and one end of the resistor R701 are connected with one end of the capacitor C701, the other end of the resistor R701 is connected with the cathode of the diode D705, the anode of the diode D705 is connected with the dotted end of the primary coil of the isolation transformer T701, and one end of the resistor R701 is connected with the dotted end of the primary coil of the isolation transformer T701;
one end of the switching tube Q701 is connected with the positive electrode of the diode D705, the other end of the switching tube Q701 is connected with the other end of the capacitor C702, and the control end of the switching tube Q701 is connected with the PWM switching driver.
5. The power supply circuit of the intelligent street lamp monitor as claimed in claim 1, wherein: pins of a first group of secondary coils and a second group of secondary coils of the isolation transformer T701 are respectively connected with the half-wave rectification circuit and the other half-wave rectification circuit; the half-wave rectification circuit comprises a diode D706 and a capacitor C703, wherein the cathode of the diode D706 is connected with one end of the capacitor C703; the other half-wave rectifying circuit comprises a diode D708 and a capacitor C704, wherein the cathode of the diode D708 is connected with one end of the capacitor C704; the anode of the diode D706 is connected with the dotted end of the first group of secondary coils of the isolation transformer T701, the other end of the capacitor C703 is connected with the synonym end of the first group of secondary coils of the isolation transformer T701, the anode of the diode D708 is connected with the dotted end of the second group of secondary coils of the isolation transformer T701, the other end of the capacitor C704 is connected with the synonym end of the second group of secondary coils of the isolation transformer T701, the two ends of the capacitor C703 are used as first output ports, and the two ends of the capacitor C704 are used as third output ports;
the half-wave rectification circuit is connected with the voltage reduction circuit; the voltage reduction circuit comprises a resistor R709, a triode Q702, a voltage stabilizing diode D707 and a capacitor C707, wherein one end of the capacitor C703 is connected with a collector of the triode Q702 and one end of the point resistor R709, a base of the triode Q702 is connected with the other end of the resistor R709 and a cathode of the voltage stabilizing diode D707, an emitter of the triode Q702 is connected with one end of the capacitor C707, the other end of the capacitor C707 is connected with an anode of the voltage stabilizing diode D707 and the other end of the capacitor C703, and two ends of the capacitor C707 serve as second output ports;
the other half-wave rectifying circuit is connected with a feedback circuit, the feedback circuit comprises a resistor R702, a resistor R703, a resistor R704, a resistor R705, an optical coupler U702, an error amplifier U701 and a capacitor C705, one end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R702 and one end of the resistor R705, the other end of the capacitor C704 of the other half-wave rectifying circuit is connected with one end of the resistor R703, the other end of the resistor R703 is connected with the negative input end of the error amplifier U701 at the other end of the resistor R702 and one end of the resistor R704, the other end of the resistor R704 is connected with one end of the capacitor C705, the other end of the capacitor C705 is connected with the cathode end of the optical coupler U702 and the output end of the error amplifier U701; wherein the positive input of the error amplifier U701 is connected to a reference voltage Ref.
6. The power supply circuit of the intelligent street lamp monitor as claimed in claim 1, wherein: the feedback circuit is connected with the feedback signal processing circuit in an isolated mode through an optical coupler U702, the feedback signal processing circuit comprises a resistor R706, a resistor R707, a resistor R708, a capacitor C706, an amplifier U703 and a comparator U704, an emitter of the optical coupler U702 is connected with one end of the resistor R707, one end of the resistor R708 and a negative input end of the amplifier U703, the other end of the resistor R707 is grounded, the other end of the resistor R708 is connected with the capacitor C706, the other end of the capacitor C706 is connected with an output end of the amplifier U703 and a positive input end of the comparator U704, and an output end of the comparator U704 is connected with a PWM switch driver; the positive input end of the amplifier U703 is connected with a reference voltage of 2.5V; the negative input end of the comparator inputs a triangular wave signal.
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| CN201922497682.2U CN211630472U (en) | 2019-12-31 | 2019-12-31 | Power supply circuit of wisdom street lamp watch-dog |
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| CN201922497682.2U CN211630472U (en) | 2019-12-31 | 2019-12-31 | Power supply circuit of wisdom street lamp watch-dog |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112911411A (en) * | 2021-01-18 | 2021-06-04 | 陈源洋 | Original electric power capacity-increasing voltage-stabilizing system of base station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112911411A (en) * | 2021-01-18 | 2021-06-04 | 陈源洋 | Original electric power capacity-increasing voltage-stabilizing system of base station |
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