CN210201552U - Uninterrupted power supply system based on wisdom street lamp - Google Patents

Abstract

The utility model discloses an uninterrupted power supply system based on a smart street lamp, which comprises a circuit breaker, a circuit controller, an auxiliary power supply circuit, a circuit breaking detection circuit, an uninterrupted power supply circuit, communication equipment and a lamp load; the utility model provides an extensive applicability's incessant power supply system based on wisdom street lamp.

Description

Uninterrupted power supply system based on wisdom street lamp

Technical Field

The utility model relates to the field of electronic technology, more specifically the utility model discloses, it relates to an uninterrupted power supply system based on wisdom street lamp.

Background

1. With the development of the 5G technology, the data transmission rate of the 5G technology is fast, the response delay is lower, the data throughput is higher, the coverage area of a base station is smaller, a base station is required to be arranged in hundreds of meters, and the coverage area is wide, so that a large number of base stations need to be arranged and installed, the biggest challenge in the 5G era is how to efficiently construct a 5G network with low cost becomes very critical, and if the 5G base station is well constructed, the construction of the 5G base station is less and high-voltage power supply is not available. Therefore, high-density and wide-range layout and high-voltage power supply are necessary conditions for building the 5G base station. The urban land resource is in short supply nowadays, and the cost is quite high for constructing a 5G base station and a high-voltage power supply network at high density.

2. With the development of smart cities, various wireless communication technologies are widely used, and the construction of communication base stations or communication devices becomes very critical.

The light pole coverage is wide, and density is big, and supply network is perfect moreover, and very suitable as the carrier of communication equipment (such as 5G basic station, WIFI basic station, loRa basic station, other small-size basic stations, other communication equipment etc.).

With the development of smart light poles, many manufacturers have smart light poles with the function of loading communication devices such as micro base stations. Therefore, it is a good choice to use the intelligent lamp pole as a carrier for carrying communication equipment such as a micro base station, but the intelligent lamp pole has the following problems:

1. the cost is very high, replaces traditional light pole on a large scale, and difficult the realization.

2. Wisdom lamp pole uses the power supply system of original street lamp, faces the problem that the street lamp electric wire netting does not have the electricity daytime.

The conventional street lamp system generally adopts a power supply scheme as shown in fig. 1, and realizes power off in the daytime and power on at night through a circuit breaker. If the carrier is used as a carrier of communication equipment such as a micro base station, the problem that the street lamp power grid is dead in the daytime is also faced.

How to solve the 24-hour electricity utilization of the street lamp power grid is the problem faced at present.

One existing solution is to modify the connection of the street light system as shown in fig. 2, so that a part of the lines in the cable is always powered on to supply power to the communication device. And the other part of the line is connected to a circuit breaker according to the traditional scheme to supply power to the street lamp. Therefore, the problem of power utilization of the communication equipment in the daytime is solved. However, the problem with this solution is that the existing street light power grid needs to be modified, which is costly and can have a significant impact on the power facilities.

Another existing solution is that the circuit breaker in the conventional solution is normally closed, see fig. 3, and the system road cable is always connected to the mains, so that the communication equipment has a normal operating voltage for 24 hours. The street lamp controller positioned in the street lamp controls the street lamp to be turned off in the daytime, and the scheme has very high requirement on the reliability of the street lamp controller. The effect achieved in large-scale application is not good with the current technical level and cost control.

Yet another solution is shown in fig. 4, where the street lamp system network supplies the street lamp cable with a low voltage during the day when the circuit breaker is open, which is not sufficient to operate the lamp load. And the normal 220V high-voltage power is switched back at night to supply power to the street lamp and the communication equipment. The principle of operation of this scheme is that the line controller generates control signals CTRL1 and CTRL2 according to a set time law.

During a first time period (e.g., 18: 00 pm to 6: 00 am), the line controller 402 sends a signal CTRL1 to close the circuit breaker 401 and the mains voltage Vac is output onto the street lamp cable to power the lamp load and the communication device. At this time, the auxiliary power supply circuit does not output voltage to the street lamp cable.

In a second time period (6: 00 am-18: 00 pm), the line controller 402 turns off the circuit breaker 401 and sends a signal CTRL2 to control the auxiliary power supply circuit to start outputting voltage onto the street lamp cable. The auxiliary power supply circuit outputs low voltage, so that the load of the street lamp cannot work. At this time, low voltage power is output to the communication device.

The scheme well makes up the defects of the previous two schemes, but has the following problems:

1. there is a gap between the strong and weak current switching. The reason for this gap is as follows:

in the first case, the circuit breaker is closed at night, and the mains voltage on the street lamp cable supplies power to the street lamp load and also to the communication device. When the auxiliary power supply circuit is needed to supply power for the street lamp cable in the daytime, the circuit controller firstly turns off the circuit breaker, and then the circuit controller controls the auxiliary power supply circuit to output low voltage to the cable. During the time period from when the line controller controls the circuit breaker to be turned off to when the auxiliary power supply circuit outputs voltage, the street lamp cable is dead.

In the second case, the circuit breaker is off during the day, and the low voltage output by the auxiliary power supply circuit is applied to the street lamp cable. When the street lamp cable needs to output high voltage electricity at night, the line controller firstly sends a signal to turn off the auxiliary output power supply circuit. Then, the breaker is controlled to be closed, and high voltage is output on the cable. During which the street light cable is unpowered.

The period of time during which the cable is dead may be in the order of milliseconds or seconds. But the communication equipment needs 24 hours to be uninterruptedly powered on, and can not be powered down, which is a place needing improvement.

2. The power supply standard of the communication equipment is generally commercial power, and the auxiliary power supply equipment outputs low-voltage power which cannot meet the power supply requirement. Therefore, a low to high voltage device is required to ensure that the operating voltage of the communication device is high.

Disclosure of Invention

The utility model overcomes prior art's is not enough, provides an uninterrupted power supply system based on wisdom street lamp.

The technical scheme of the utility model as follows:

the uninterrupted power supply system based on the intelligent street lamp comprises a circuit breaker, a line controller, an auxiliary power supply circuit, a broken circuit detection circuit, an uninterrupted power supply circuit, communication equipment and a lamp load;

the auxiliary power supply circuit is connected in parallel at two ends of the circuit breaker, the input end of the auxiliary power supply circuit and one end of the circuit breaker are connected with the mains supply, the output end of the auxiliary power supply circuit and the other end of the circuit breaker are connected with a street lamp cable, and the output of the auxiliary power supply circuit is low voltage; the auxiliary power supply circuit is connected with the line controller, and the open circuit detection circuit is connected with a street lamp cable; the open circuit detection circuit is connected with one end of the auxiliary power supply circuit; the circuit controller is connected with the circuit breaker; the uninterrupted power supply circuit and the lamp load are connected with a street lamp cable, and the output end of the uninterrupted power supply circuit is connected with the communication equipment;

the turn-off signal of the circuit breaker comprises two modes of generation; the first mode is generated by a circuit break detection circuit, and a detection signal CTRL3 is generated and sent to an auxiliary power supply circuit based on the current flowing through the circuit breaker and the voltage of the second end of the circuit breaker; in the second way, the signal CTRL4 that the circuit breaker has been switched off is sent directly by the line controller to the auxiliary power supply circuit;

when the auxiliary power supply circuit receives a signal that the circuit breaker needs to be closed, the auxiliary power supply circuit stops outputting low voltage to the street lamp cable, and the circuit controller controls the circuit breaker to be closed;

the uninterrupted power supply circuit is used for supplying power to the communication equipment, during the closing period of the circuit breaker, the input of the uninterrupted power supply circuit is commercial power, and the output end of the uninterrupted power supply circuit outputs 220V alternating current voltage or 350V direct current; when the circuit breaker is disconnected and the auxiliary power supply circuit does not output low voltage to the street lamp cable, the uninterrupted power supply circuit directly provides 220V alternating current or 320V direct current for the communication equipment; when the circuit breaker is disconnected and the auxiliary power supply circuit outputs low voltage to the street lamp cable, the uninterrupted power supply circuit converts the low voltage into 220V alternating current or 350V direct current to supply power for the communication equipment.

Further, the low-voltage power output by the auxiliary power supply circuit to the street lamp cable comprises one of low-voltage alternating current and low-voltage direct current.

Furthermore, the uninterrupted power supply circuit comprises one of output alternating current and output direct current;

furthermore, the auxiliary power supply circuit comprises an autotransformer, a switch and a control circuit; the input and the output of the autotransformer share the same coil, one end of the coil is coupled with the mains voltage, and the other end of the coil is grounded; a third end arranged in the middle of the coil provides an auxiliary power supply voltage Vaux; the control circuit is connected with the switch, and the closing of the switch is determined by the control circuit.

Further, the auxiliary power supply circuit comprises a filter circuit, an AC/DC circuit, a DC/AC circuit, an auxiliary power supply, a control circuit, a first switch and a second switch;

the output end of the filter circuit is connected with the AC/DC circuit and the auxiliary power supply; the AC/DC circuit is connected with the DC/DC circuit and the DC/AC circuit; the DC/DC circuit is connected with the first switch, and the other end of the first switch is connected with a street lamp cable; one end of the DC/AC circuit is connected with the second switch, and one end of the second switch is connected with the street lamp cable; the auxiliary power supply is connected with the control circuit, and the control circuit is connected with the DC/DC circuit, the DC/AC circuit, the first switch and the second switch.

Further, the filter circuit filters the alternating current; the AC/DC circuit is used for converting alternating current into direct current; the DC/DC circuit converts direct current into direct current; the DC/AC circuit converts direct current into alternating current; the auxiliary power supply provides stable working voltage for the control chips of all parts of circuits; the control circuit controls the DC/DC conversion circuit, the DC/AC conversion circuit, the first switch and the second switch; the first switch and the second switch adopt one of a relay, an MOS (metal oxide semiconductor) tube or controllable silicon; and the output end of the second switch is provided with a mains supply backflow protection circuit.

Furthermore, the open circuit detection circuit comprises a rectification circuit, a voltage division circuit, a comparison circuit, a timing circuit and a logic circuit;

the rectifying circuit is provided with an input end and an output end, wherein the input end is connected with one end of the circuit breaker, the output end of the rectifying circuit is connected with the voltage dividing circuit, the output end of the voltage dividing circuit is connected with a first input end of the comparison circuit, a second input end of the comparison circuit is connected with the threshold voltage signal, the output end of the comparison circuit is connected with the input end of the timing circuit and the first input end of the logic circuit, and the output end of the timing circuit is connected with the second input end of the logic circuit; the output end of the logic circuit is connected with the auxiliary power supply circuit.

Further, the rectification circuit adopts a half-wave rectification circuit, a full-wave rectification circuit or a bridge rectification circuit.

Furthermore, the uninterrupted power supply circuit comprises an input filter circuit, an AC/DC circuit, a charging circuit, a first diode, an inverter circuit, an output filter circuit, a battery pack, a battery booster circuit, a second diode, a drive circuit, a control circuit and an A/D conversion circuit;

the input end of the input filter circuit is connected with the street lamp cable, and the output end of the filter circuit is connected with the AC/DC circuit and the charging circuit; the charging circuit is connected with the battery pack and the control circuit; the other end of the AC/DC circuit is connected with the anode of a first diode, and the cathode of the first diode is connected with the cathode of a second diode and the inverter circuit; the inverter circuit is connected with the output filter circuit; the anode of the second diode is connected with the battery booster circuit; the battery booster circuit is connected with the control circuit and the battery pack; the control circuit is connected with the drive circuit and the A/D conversion circuit; the driving circuit is connected with the inverter circuit, and the A/D conversion circuit is connected with the output end of the output filter circuit.

Furthermore, the uninterrupted power supply circuit comprises a filter circuit, an AC/DC circuit, a charging circuit, a battery pack, a battery booster circuit, a first diode and a second diode;

the input end of the input filter circuit is connected with the street lamp cable, and the output end of the filter circuit is connected with the input end of the AC/DC circuit; the output end of the AC/DC circuit is connected with the first diode; the input end of the charging circuit is connected with a street lamp cable; the output end of the charging circuit is connected with the battery pack, and the battery pack is connected with the input end of the battery boosting circuit; the output end of the battery booster circuit is connected with the second diode; the cathode of the first diode is connected with the cathode of the second diode.

The utility model has the advantages that: the scheme does not need to reform original street lamp lines and equipment, and only needs to add a line controller, an auxiliary power supply circuit, a circuit breaking detection circuit and an uninterrupted power supply circuit at the power end of the communication equipment.

The advantage of this scheme is that it can perform full-time uninterrupted signal coverage as shown in fig. 6. Fig. 6 shows waveforms of the respective circuits, which are described below.

In a time period from t1 to t2 (for example, 18:01 pm to 6:00 am the next day), the circuit controller controls the circuit breaker to close, and the voltage on the street lamp cable is the mains voltage. The commercial power on the street lamp cable line supplies power to the lamp load, and simultaneously, 220V alternating current or 350V direct current is output through the uninterrupted power supply circuit to supply power to the communication equipment. And charging the battery in the uninterruptible power supply circuit.

In the time period from t2 to t3, the time period is generally in the order of seconds or milliseconds (e.g., 6: 00 to 6: 01 in the morning). The circuit controller turns off the circuit breaker, and the auxiliary power supply circuit does not output voltage to the street lamp cable when the circuit break detection circuit detects that the circuit breaker is turned off or receives a signal sent by the circuit controller to turn off the circuit breaker. The street light cable is idle for this period of time, with no voltage. The uninterrupted power supply circuit provides 220V alternating current or 320V direct current for the communication equipment through an internal battery.

In the time period from t3 to t4, (for example, from 6: 01 a.m. to 18: 00 a.m.), the circuit breaker is turned off, the auxiliary power supply circuit outputs low voltage to the street lamp cable, and the uninterruptible power supply circuit converts the low voltage into 220V alternating current or 350V direct current to supply power to the communication equipment. The street lamp load at this time does not work.

And in a time period from t4 to t5, (18: 00 to 18: 01 in the afternoon), the line controller sends a signal to the auxiliary power supply circuit to stop outputting low voltage electricity. During this time period, the street light cable is in an idle state with no voltage. At the moment, the uninterruptible power supply supplies 220V alternating current or 320V direct current to the communication equipment through an internal battery.

Drawings

FIG. 1 is a schematic block diagram of a conventional street lamp power supply system for powering a communication device;

FIG. 2 is a schematic block diagram of a dedicated line for powering a communication device;

fig. 3 is a schematic block diagram of a power supply mode with a normally closed circuit breaker for supplying power to a communication device;

FIG. 4 is a schematic block diagram of a high voltage at night and a low voltage during the day to power a communication device;

fig. 5 is a schematic block diagram of a 24H uninterruptible power supply system for supplying high voltage power to communication equipment;

FIG. 6 is a waveform diagram of various circuits of the present invention;

FIG. 7 is a functional block diagram of an auxiliary power unit;

FIG. 8 is a functional block diagram of another auxiliary power unit;

FIG. 9 is a functional block diagram of a trip detection circuit;

FIG. 10 is a schematic block diagram of an uninterruptible power supply circuit;

fig. 11 is a schematic block diagram of another uninterruptible power supply circuit.

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 only for explaining the present invention, and are not intended to limit the present invention, and the circuits of the present invention, which are not explicitly designed, all adopt conventional designs, such as AC/DC circuit, DC/AC circuit, reverse flow protection circuit, etc.

As shown in the figure, the uninterrupted communication equipment power supply system based on the lighting street lamp comprises a line controller, a circuit breaker, an auxiliary power supply circuit, a circuit breaking detection circuit, an uninterrupted power supply circuit, communication equipment and a lamp load.

The auxiliary power supply circuit is connected in parallel at two ends of the circuit breaker, and the input end of the auxiliary power supply circuit and one end of the circuit breaker are connected with the commercial power Vac, namely the input end is connected with the commercial power Vac. The output end of the auxiliary power supply circuit and the other end of the breaker are connected with a street lamp cable, and the output of the auxiliary power supply circuit is low voltage; the auxiliary power supply circuit is connected with the line controller, and the open circuit detection circuit is connected with a street lamp cable; the open circuit detection circuit is connected with one end of the auxiliary power supply circuit and is connected with a street lamp cable. The circuit controller is connected with the circuit breaker and the auxiliary power supply circuit. The uninterrupted power supply circuit and the lamp load are connected with a street lamp cable, and the output end of the uninterrupted power supply circuit is connected with the communication equipment.

The auxiliary power supply circuit is connected in parallel at two ends of the circuit breaker, and the input end of the auxiliary power supply circuit and one end of the circuit breaker are connected with the commercial power Vac. The output end of the auxiliary power supply circuit and the other end of the breaker are connected with a street lamp cable, and the output of the auxiliary power supply circuit is low-voltage electricity.

The open circuit detection circuit judges the turn-off of the circuit breaker according to a voltage or current signal on the street lamp cable, and controls the auxiliary power supply circuit to output low voltage to the street lamp cable, and the voltage output by the auxiliary power supply circuit at the moment can be alternating current or direct current according to needs.

The open circuit detection circuit detects the turn-off of the circuit breaker, feeds information CTRL3 back to the auxiliary power supply circuit and is used for judging whether the street lamp cable is powered off or not. Or the line controller sends the shutdown information CTRL4 of the circuit breaker to the auxiliary supply circuit.

The uninterrupted power supply circuit is used for supplying power to the communication equipment, when the circuit breaker is closed, the input of the uninterrupted power supply circuit is commercial power Vac, and the output end of the uninterrupted power supply circuit outputs 220V alternating current voltage or 350V direct current. When the circuit breaker is disconnected and the auxiliary power supply circuit does not output low voltage to the street lamp cable, the uninterrupted power supply circuit directly provides 220V alternating current or 320V direct current for the communication equipment. When the circuit breaker is disconnected and the auxiliary power supply circuit outputs low voltage to the street lamp cable, the uninterrupted power supply circuit converts the low voltage into 220V alternating current or 350V direct current to supply power for the communication equipment. Thereby, the communication equipment is powered on for twenty-four hours.

Fig. 7 shows that the auxiliary power supply circuit comprises an autotransformer, a switch and a control circuit. The input and output of the autotransformer share a set of coils, one end of which is coupled to the mains voltage Vac, and the other end of which is coupled to the reference ground. The third end is drawn out from the middle of the coil of the winding to provide auxiliary power supply voltage Vaux, and the auxiliary power supply voltage Vaux is connected to a street lamp cable through a switch, and the switch is closed by a control circuit. One end of the control circuit is connected with the switch. The control circuit controls the switch by receiving a breaker switch state signal sent by the line controller or a breaker turn-off signal sent by the open circuit detection circuit.

Fig. 8 shows another auxiliary power supply circuit including a filter circuit, an AC/DC circuit, a DC/AC circuit, an auxiliary power supply, a control circuit, a first switch and a second switch.

The output end of the filter circuit is connected with the AC/DC circuit and the auxiliary power supply; the AC/DC circuit is connected with the DC/DC circuit and the DC/AC circuit; the DC/DC circuit is connected with the first switch, and the other end of the first switch is connected with a street lamp cable; one end of the DC/AC circuit is connected with the second switch, and one end of the second switch is connected with the street lamp cable; the auxiliary power supply is connected with the control circuit, and the control circuit is connected with the DC/DC circuit, the DC/AC circuit, the first switch and the second switch.

And the filter circuit is used for filtering the input voltage and current.

And the AC/DC circuit is used for converting alternating current into direct current.

The DC/DC circuit converts direct current into direct current.

The DC/AC circuit converts direct current into alternating current.

And the auxiliary power supply is used for providing stable working voltage for the control chips of all parts of circuits.

And a control circuit for controlling the DC/DC conversion circuit, the DC/AC conversion circuit, the first switch and the second switch.

The first switch and the second switch adopt one of a relay, an MOS (metal oxide semiconductor) tube or controllable silicon; the junction of the first switch and the second switch is provided with a mains supply backflow protection circuit (not shown in the figure, which is designed conventionally).

As shown in fig. 9, the disconnection detection circuit includes a rectifier circuit, a voltage divider circuit, a comparator circuit, a timer circuit, and a logic circuit.

The rectifying circuit is provided with an input end and an output end, wherein the input end is connected with one end of the circuit breaker, and the output end of the rectifying circuit is connected with the voltage dividing circuit. The output end of the voltage division circuit is connected with the first input end of the comparison circuit, the second input end of the comparison circuit is connected with the threshold voltage signal, the output end of the comparison circuit is connected with the input end of the timing circuit and the first input end of the logic circuit, and the output end of the timing circuit is connected with the second input end of the logic circuit; the output end of the logic circuit is connected with the auxiliary power supply circuit.

The rectifier circuit rectifies the voltage on the circuit lamp cable, and generates a rectified signal Vrec at the output end of the rectifier circuit. The rectifier circuit may be a half-wave, full-wave or bridge rectifier circuit.

The input end of the voltage division circuit is connected with the output end of the rectification circuit, and divides the voltage of the rectification signal Vrec to generate a voltage division signal Vdiv at the output end. Typically by means of a resistive divider.

The comparison circuit comprises a first input end, a second input end and an output end, wherein the first input end is connected with the output end of the voltage division circuit. The second input terminal receives the threshold voltage signal Vth. The comparator circuit compares the divided voltage signal Vdiv with the threshold voltage signal Vth to provide a comparison signal CMP at an output terminal.

The input end of the timer circuit is connected with the output end of the comparison circuit, and the timer is used for timing based on the comparison signal CMP. The timed time is compared with a predetermined time threshold TTH to generate a signal T0 at the output. The timing circuit can be realized by adopting a resistance-capacitance circuit or directly connecting a digital timer.

The logic circuit comprises a first input end, a second input end and an output end. The first input end is connected with the output end of the comparison circuit, and the second input end is connected with the output end of the timing circuit. The logic circuit generates a control signal at an output terminal for controlling the auxiliary power supply circuit according to the comparison signal CMP and the timing signal T0.

As shown in fig. 10, the uninterruptible power supply circuit includes an input filter circuit, an AC/DC circuit, a charging circuit, a first diode, an inverter circuit, an output filter circuit, a battery pack, a battery booster circuit, a second diode, a driving circuit, a control circuit, and an a/D converter circuit.

The input end of the input filter circuit is connected with the street lamp cable, and the output end of the filter circuit is connected with the AC/DC circuit and the charging circuit; the charging circuit is connected with the battery pack and the control circuit; the other end of the AC/DC circuit is connected with the anode of a first diode, and the cathode of the first diode is connected with the cathode of a second diode and the inverter circuit; the inverter circuit is connected with the output filter circuit; the anode of the second diode is connected with the battery booster circuit; the battery booster circuit is connected with the control circuit and the battery pack; the control circuit is connected with the drive circuit and the A/D conversion circuit; the driving circuit is connected with the inverter circuit, and the A/D conversion circuit is connected with the output end of the output filter circuit.

The input end of the charging circuit is connected with the output end of the input filter circuit. The output end of the charging circuit is connected with the input end of the battery pack. The charging circuit mainly functions to charge the battery pack. The charging circuit is usually of a flyback type, a BOOST type, or a half-bridge type, any of which is acceptable. If a large-current charging circuit is adopted, a single-tube IGBT can be adopted for power control, and high efficiency and large charging current can be obtained.

The input end of the battery booster circuit is connected with the output end of the battery pack, and the output end of the battery booster circuit is connected with the anode of the second diode.

The control circuit is connected with the charging circuit, the battery booster circuit, the A/D conversion circuit and the driving circuit. The control circuit is composed of a single chip microcomputer and other auxiliary circuits and is mainly responsible for generation of pulse width modulation waves, synchronization of output sine waves and mains supply, UPS management, alarming and protection.

And the A/D conversion circuit is used for acquiring voltage and current signals of the output end of the uninterrupted power supply circuit. And then fed back to the control circuit.

The input end of the output filter circuit is connected with the inverter circuit, and the output end of the output filter circuit is connected with the communication equipment.

Fig. 11 shows another uninterruptible power supply circuit including a filter circuit, an AC/DC circuit, a charging circuit, a battery pack, a battery boosting circuit, a first diode, and a second diode. The input end of the filter and the input end of the charging circuit are connected with a street lamp cable. The output end of the charging circuit is connected with the battery pack. The output end of the battery pack is connected with the boosting circuit, and the output end of the battery boosting circuit is connected with the anode of the second diode. The output end of the filter is connected with the input end of the AC/DC circuit, and the output end of the AC/DC circuit is connected with the anode of the first diode. The cathode of the second diode is connected with the cathode of the second diode.

The input end of the filter can input 36-265V alternating current or direct current.

And the charging circuit is used for charging the battery pack.

The first diode and the second diode are isolation diodes.

And the AC/DC circuit is an AC/DC converter and outputs constant direct current.

And a battery boosting circuit for boosting the DC of the battery pack to 320V DC.

When the voltage on the street lamp cable is the commercial power, the commercial power passes through the filter circuit, then passes through the AC/DC circuit to be converted into 350V direct current, and is output through the isolation diode. At this time, the commercial power charges the battery through the charging circuit, and the battery boosting circuit outputs 320V of direct current. Since the cathode of the first diode outputs a high voltage of 350V, the second diode is turned off at this time. The supply voltage for the communication device is 350V dc.

When no voltage exists on the street lamp cable, the battery boosting circuit converts the voltage of the battery pack into 320V direct current to supply power to the communication equipment through the second diode.

When the voltage on the circuit lamp cable is low voltage, the AC/DC circuit outputs 350V direct current to supply power for the communication equipment through the isolation diode. At this time, the cathode voltage of the second diode is 350V and the anode voltage is 320V, so that the second diode is turned off. The charging circuit at this time does not operate.

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 (10)

1. The intelligent street lamp-based uninterrupted power supply system is characterized by comprising a circuit breaker, a line controller, an auxiliary power supply circuit, a broken circuit detection circuit, an uninterrupted power supply circuit, communication equipment and a lamp load;

the auxiliary power supply circuit is connected in parallel at two ends of the circuit breaker, the input end of the auxiliary power supply circuit and one end of the circuit breaker are connected with the mains supply, the output end of the auxiliary power supply circuit and the other end of the circuit breaker are connected with a street lamp cable, and the output of the auxiliary power supply circuit is low voltage; the auxiliary power supply circuit is connected with the line controller, and the open circuit detection circuit is connected with a street lamp cable; the open circuit detection circuit is connected with one end of the auxiliary power supply circuit; the circuit controller is connected with the circuit breaker; the uninterrupted power supply circuit and the lamp load are connected with a street lamp cable, and the output end of the uninterrupted power supply circuit is connected with the communication equipment;

the turn-off signal of the circuit breaker comprises two modes of generation; the first mode is generated by a circuit break detection circuit, and a detection signal CTRL3 is generated and sent to an auxiliary power supply circuit based on the current flowing through the circuit breaker and the voltage of the second end of the circuit breaker; in the second way, the signal CTRL4 that the circuit breaker has been switched off is sent directly by the line controller to the auxiliary power supply circuit;

when the auxiliary power supply circuit receives a signal that the circuit breaker needs to be closed, the auxiliary power supply circuit stops outputting low voltage to the street lamp cable, and the circuit controller controls the circuit breaker to be closed;

the uninterrupted power supply circuit is used for supplying power to the communication equipment, during the closing period of the circuit breaker, the input of the uninterrupted power supply circuit is commercial power, and the output end of the uninterrupted power supply circuit outputs 220V alternating current voltage or 350V direct current; when the circuit breaker is disconnected and the auxiliary power supply circuit does not output low voltage to the street lamp cable, the uninterrupted power supply circuit directly provides 220V alternating current or 320V direct current for the communication equipment; when the circuit breaker is disconnected and the auxiliary power supply circuit outputs low voltage to the street lamp cable, the uninterrupted power supply circuit converts the low voltage into 220V alternating current or 350V direct current to supply power for the communication equipment.

2. The intelligent street lamp-based uninterruptible power supply system of claim 1, wherein: the low-voltage power output by the auxiliary power supply circuit to the street lamp cable comprises one of low-voltage alternating current and low-voltage direct current.

3. The intelligent street lamp-based uninterruptible power supply system of claim 1, wherein: the uninterrupted power supply circuit comprises one of output alternating current and output direct current.

4. The intelligent street lamp-based uninterruptible power supply system of claim 1, wherein: the auxiliary power supply circuit comprises an autotransformer, a switch and a control circuit; the input and the output of the autotransformer share the same coil, one end of the coil is coupled with the mains voltage, and the other end of the coil is grounded; a third end arranged in the middle of the coil provides an auxiliary power supply voltage Vaux; the control circuit is connected with the switch, and the closing of the switch is determined by the control circuit.

5. The intelligent street lamp-based uninterruptible power supply system of claim 1, wherein: the auxiliary power supply circuit comprises a filter circuit, an AC/DC circuit, a DC/AC circuit, an auxiliary power supply, a control circuit, a first switch and a second switch;

the output end of the filter circuit is connected with the AC/DC circuit and the auxiliary power supply; the AC/DC circuit is connected with the DC/DC circuit and the DC/AC circuit; the DC/DC circuit is connected with the first switch, and the other end of the first switch is connected with a street lamp cable; one end of the DC/AC circuit is connected with the second switch, and one end of the second switch is connected with the street lamp cable; the auxiliary power supply is connected with the control circuit, and the control circuit is connected with the DC/DC circuit, the DC/AC circuit, the first switch and the second switch.

6. The intelligent street lamp-based uninterruptible power supply system of claim 5, wherein: the filter circuit filters the alternating current; the AC/DC circuit is used for converting alternating current into direct current; the DC/DC circuit converts direct current into direct current; the DC/AC circuit converts direct current into alternating current; the auxiliary power supply provides stable working voltage for the control chips of all parts of circuits; the control circuit controls the DC/DC conversion circuit, the DC/AC conversion circuit, the first switch and the second switch; the first switch and the second switch adopt one of a relay, an MOS (metal oxide semiconductor) tube or controllable silicon; and the output end of the second switch is provided with a mains supply backflow protection circuit.

7. The intelligent street lamp-based uninterruptible power supply system of claim 1, wherein: the open circuit detection circuit comprises a rectification circuit, a voltage division circuit, a comparison circuit, a timing circuit and a logic circuit;

the rectifying circuit is provided with an input end and an output end, wherein the input end is connected with one end of the circuit breaker, the output end of the rectifying circuit is connected with the voltage dividing circuit, the output end of the voltage dividing circuit is connected with a first input end of the comparison circuit, a second input end of the comparison circuit is connected with the threshold voltage signal, the output end of the comparison circuit is connected with the input end of the timing circuit and the first input end of the logic circuit, and the output end of the timing circuit is connected with the second input end of the logic circuit; the output end of the logic circuit is connected with the auxiliary power supply circuit.

8. The intelligent street lamp-based uninterruptible power supply system of claim 7, wherein: the rectification circuit adopts a half-wave rectification circuit, a full-wave rectification circuit or a bridge rectification circuit.

9. The intelligent street lamp-based uninterruptible power supply system of claim 1, wherein: the uninterrupted power supply circuit comprises an input filter circuit, an AC/DC circuit, a charging circuit, a first diode, an inverter circuit, an output filter circuit, a battery pack, a battery booster circuit, a second diode, a drive circuit, a control circuit and an A/D conversion circuit;

the input end of the input filter circuit is connected with the street lamp cable, and the output end of the filter circuit is connected with the AC/DC circuit and the charging circuit; the charging circuit is connected with the battery pack and the control circuit; the other end of the AC/DC circuit is connected with the anode of a first diode, and the cathode of the first diode is connected with the cathode of a second diode and the inverter circuit; the inverter circuit is connected with the output filter circuit; the anode of the second diode is connected with the battery booster circuit; the battery booster circuit is connected with the control circuit and the battery pack; the control circuit is connected with the drive circuit and the A/D conversion circuit; the driving circuit is connected with the inverter circuit, and the A/D conversion circuit is connected with the output end of the output filter circuit.

10. The intelligent street lamp-based uninterruptible power supply system of claim 1, wherein: the uninterrupted power supply circuit comprises a filter circuit, an AC/DC circuit, a charging circuit, a battery pack, a battery booster circuit, a first diode and a second diode;

the input end of the input filter circuit is connected with the street lamp cable, and the output end of the filter circuit is connected with the input end of the AC/DC circuit; the output end of the AC/DC circuit is connected with the first diode; the input end of the charging circuit is connected with a street lamp cable; the output end of the charging circuit is connected with the battery pack, and the battery pack is connected with the input end of the battery boosting circuit; the output end of the battery booster circuit is connected with the second diode; the cathode of the first diode is connected with the cathode of the second diode.

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