KR19980060992U - Control device of street light - Google Patents

Abstract

The present invention relates to a control apparatus for a low-pressure sodium street lamp using a solar cell, and conventionally, the power generated from the solar cell is charged and overdischarged by a relay, and the on / off of the lamp is induced. And the power consumption of the inverter is about 60 ~ 70% and the efficiency of the magnetic ballast is 70%. In order to use the low-pressure sodium lamp for 36W, about 47W is consumed. And the configuration of the apparatus becomes large, so that the cost becomes high and the installation becomes problematic. Accordingly, the present invention provides a solar cell comprising: a solar cell (1) directly converting solar energy into electric energy and generating the converted electric power; A battery (2) for charging electric power generated in the solar cell (1); And an overcharge prevention unit for turning on the contactless element so that the generated power is charged in the battery when the voltage of the battery (2) drops when the battery (2) is charged, (3); A solar cell generation voltage sensing unit 4 for sensing the power generated from the solar cell 1 and comparing it with a reference voltage and outputting a solar cell generation voltage comparison signal according to the comparison; An overcharge-proof non-contact portion (5) for turning on and off the contactless element according to a control signal of the overcharge protection portion (3) so that the battery (2) is charged / discharged; A battery low voltage sensing unit 6 for outputting a battery low voltage signal when the capacitor 2 is in a low-charged state due to climatic conditions; A battery low voltage latch unit 7 for outputting a pulse having a predetermined width when a battery low voltage signal generated in the battery low voltage sensing unit 6 is inputted; A solar cell reset sensing unit 9 for generating a solar cell reset signal when the solar cell 1 is in a normal state; A solar cell reset latch unit 10 for outputting a pulse having a predetermined width when a solar cell reset signal generated by the solar cell reset detection unit 9 is inputted; A flip-flop circuit unit (11) for latching signals output from the battery low voltage latch unit (7) and the solar cell reset latch unit (10); A comparison unit 12 for comparing the solar cell generation voltage comparison signal of the solar cell generation voltage sensing unit 4 with the latch signal of the flip-flop circuit unit 11 and outputting a comparison signal corresponding thereto; An overdischarge prevention and lamp driving unit 13 for turning on or off according to a comparison output of the comparison unit 12 to prevent overdischarge and controlling the lamp on / off; And an oscillation driving unit 14 for turning on or off the lamp 8 in accordance with the output of the overdischarge prevention and lamp driving unit 913 so as to charge and discharge the battery in accordance with the capacity of the storage battery, In addition, there is an effect that the low-pressure sodium lamp is directly driven by a power source in which a DC power is boosted to an AC power source by preventing the excessive plate loss by preventing a cell plate loss.

Description

Control device of street light

The present invention relates to a control apparatus for a low-pressure sodium street lamp using a solar cell. In particular, a solar cell is used to charge a solar cell to a battery during the daytime and automatically operates low- To minimize a self-consumed electric power, and to design a streetlight with an inexpensive price.

1, a control device structure of a conventional street light includes a solar battery unit 1 for directly converting solar energy into electric energy and outputting the converted electric energy; A charging unit (3) for charging the battery (2) with electric power, which is the electric energy converted by the solar battery unit (1); (4) for detecting the sunrise and sunset by sensing the electric power generated by the solar cell unit (1) and outputting a driving signal according to the sunrise and sunset; A relay driving unit 5 for connecting or disconnecting the power supply of the battery unit 2 according to the driving signal of the point and light-off control unit 4; An inverter unit (6) for converting the DC power supplied from the battery unit (2) into AC power and outputting the AC power; A stabilizer unit 7 for generating a square wave when AC power is supplied from the inverter unit 6; And a lamp unit 8 for lighting the lamp by means of a square wave transmitted from the stabilizer base 7.

A detailed description will be made of the conventional art constructed as above.

The charging unit 3 turns on the push button PB1 to turn on the power generated by the solar battery unit 1 to the power storage unit 2).

At this time, the point and the light-off control unit 4 detect the sunrise and sunset by sensing the voltage generated by the solar battery unit 1.

When the identification result is identified as sunset, the point and light-off control unit 4 gives a signal to the relay driving unit 5 to turn on the push button PB2.

Therefore, when the relay driving unit 5 turns on the push button PB2, the DC power charged in the battery unit 2 is supplied to the inverter unit 6.

The inverter unit 6, which is supplied with the DC power, converts the AC power into AC power and outputs the AC power to the stabilizer unit 7.

Accordingly, the stabilizer 7 generates a square wave using a transformer and a capacitor, and provides the square wave to the lamp unit 8.

The lamp unit 8 turns on the lamp.

When the operation is performed as described above and power is generated in the solar cell unit 1 at the time of sunrise, it is detected by the point and light-off control unit 4.

The point and light-off control unit 4 generates a signal to the relay driving unit 5 and turns off the push button PB2 to cut off power supplied from the battery unit 2 to the inverter unit 6 to stop the operation .

Thus, the lamp is turned off and the battery 2 is again charged with power.

However, in the conventional technology as described above, since the power generated from the solar cell is charged and overdischarged by the relay and the lamp is turned on / off, the lifetime of the contact point is limited. Therefore, In addition, since the efficiency of the inverter is about 60 ~ 70% and the efficiency of the magnetic ballast is 70%, it consumes about 47W in order to use the low pressure sodium lamp for 36W. As a result, Is expensive and has a problem in installation.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a control device for a street lamp that makes a contact lifetime semi-permanent by using an electronic ballast using a contactless element and a DC power source.

Another object of the present invention is to provide a control device of a streetlight which has an efficiency of 95% or more with an electronic ballast, which reduces the quantity and arrangement of solar cells, thereby lowering the cost and facilitating installation.

1 is a block diagram of a control device block of a conventional street lamp;

Fig. 2 is a block diagram of a control apparatus block of the proposed streetlight. Fig.

Figure 3 is a detailed circuit diagram of Figure 2;

FIG. 4 is a chart showing the monthly sunset, the sunrise time, and the lighting time in Korea.

FIG. 5 is a table showing various efficiency comparison results of the conventional and the present invention.

6 is a chart showing the required capacity of the battery of the prior art and the present invention.

Description of the Related Art [0002]

1: Solar cell 2: Storage battery

3: Overcharge prevention part 4: Solar cell generated voltage detection part

5: overcharge protection non-contact part 6: battery low voltage sensing part

7: Battery low voltage latch part 8: Lamp

9: Solar cell reset detection unit 10: Solar cell reset latch unit

11: Flip-flop circuit part 12:

13: overdischarge prevention and lamp on-off driver

14:

In order to achieve the above object, the present invention provides a control apparatus for a streetlight, comprising: a solar cell (1) for directly converting solar energy into electric energy and generating the converted electric power; A battery (2) for charging electric power generated in the solar cell (1); And an overcharge prevention unit for turning on the contactless element so that the generated power is charged in the battery when the voltage of the battery (2) drops when the battery (2) is charged, (3); A solar cell generation voltage sensing unit 4 for sensing the power generated from the solar cell 1 and comparing it with a reference voltage and outputting a solar cell generation voltage comparison signal according to the comparison; An overcharge-proof non-contact portion (5) for turning on and off the contactless element according to a control signal of the overcharge protection portion (3) so that the battery (2) is charged / discharged; A battery low voltage sensing unit 6 for outputting a battery low voltage signal when the capacitor 2 is in a low-charged state due to climatic conditions; A battery low voltage latch unit 7 for outputting a pulse having a predetermined width when a battery low voltage signal generated in the battery low voltage sensing unit 6 is inputted; A solar cell reset sensing unit 9 for generating a solar cell reset signal when the solar cell 1 is in a normal state; A solar cell reset latch unit 10 for outputting a pulse having a predetermined width when a solar cell reset signal generated by the solar cell reset detection unit 9 is inputted; A flip-flop circuit unit (11) for latching signals output from the battery low voltage latch unit (7) and the solar cell reset latch unit (10); A comparison unit 12 for comparing the solar cell generation voltage comparison signal of the solar cell generation voltage sensing unit 4 with the latch signal of the flip-flop circuit unit 11 and outputting a comparison signal corresponding thereto; An overdischarge prevention and lamp driving unit 13 for turning on or off according to a comparison output of the comparison unit 12 to prevent overdischarge and controlling the lamp on / off; And an oscillation driving unit 14 for turning on or off the lamp 8 in accordance with the output of the over-discharge preventing and lamp driving unit 913.

The operation and effect of the present invention will be described in detail as follows.

When the solar cell 1 directly converts the solar energy into electric power and outputs the electric power, a constant electric potential is maintained in the gate of the NMOS transistor Q1 constituting the overcharge-proof non-contact portion 5, The transistor Q1 is turned on and the source-drain is turned on to charge the battery 2 via the diode D1.

When the charging voltage of the battery 2 reaches the full charge, the resistors R5 and R6 input to the inverting terminal (-) of the operational amplifier OP1 of the overvoltage preventive unit 3 and the battery charging by the variable resistor VR2 And the battery charging reference voltage by the resistor R7 input to the non-inverting terminal (+).

As a result of comparison, the battery charging voltage becomes higher than the battery charging reference voltage according to the name before the charging voltage of the battery 2 is full, and the low signal is outputted to the base of the transistor Tr1 through the resistor R10.

As a result, the transistor Tr1 is turned off and the non-contact element Q1 of the overcharge-proof non-contact portion 15 is turned off as the transistor Tr1 is turned off.

Therefore, the power generated in the solar cell 1 is cut off, thereby preventing the overcharge state of the storage battery 2. [

Conversely, when the voltage of the battery 2 drops, the battery charging voltage inputted to the inverting terminal (-) of the operational amplifier OP1 of the overvoltage preventing unit 3 is input to the non-inverting terminal (+), And outputs a high-low voltage signal to the base of the transistor Tr1 through the resistor R10.

The transistor Tr1 is turned on so that the contactless element Q1 of the overcharge-proof non-contact portion 5 is turned on to generate electric power from the solar cell 1 to the storage battery 2 to be charged.

The state of the battery 2 is optimized through the repetitive operation as described above.

The resistors R19, R20, R22, and R22 input to the non-inverting terminal (+) of the operational amplifier OP3 of the battery low voltage sensing unit 6 when the state of the battery 2 reaches the low- R23 and the variable resistor VR3 become lower than the capacitor low charging reference voltage by the resistor R21 input to the inverting terminal (-), the output of the operational amplifier OP3 changes from high to low .

The low signal is a pulse of a high state having a constant width by the time constant of the resistor R24 of the T flip flop 72 and the capacitor C7 by the operation of the gate 71 of the capacitor low voltage latch unit 70, And outputs it to the first NAND gate ND1 of the flip-flop circuit portion 11 so as to latch it.

The latched high-state pulse signal changes to the low state via the first NAND gate ND1. The low-state signal again becomes the high-state signal Q6 via the inverter I1, The third NAND gate ND3 of FIG.

The third NAND gate ND3 receives the solar cell generated voltage comparison signal to the other side of the third NAND gate ND3 and outputs the NANDed signal to the base of the transistor Tr2 of the overdischarge prevention and lamp driving unit 13 .

The photovoltaic generation voltage comparison signal is generated by the operation amplifier OP2 of the solar voltage generation voltage sensing unit 4 and the reference voltage and the resistors R1, R2, R4, VR1 ). When the generated voltage of the solar cell is equal to or higher than the reference voltage, it outputs a high-state solar cell generation voltage comparison signal to indicate that the solar cell is low.

The third NAND gate ND3 outputs a NAND gate low signal to the base of the transistor Tr2 when the comparator 11 outputs the high voltage solar cell voltage comparison signal to the third NAND gate ND3, .

Therefore, the transistor Tr2 is turned off.

As a result, the transistors Tr3 and Tr4 of the oscillation driving unit 14 are also turned off, and the lamp 8 can not be turned on.

R14, R16, and VR3 to the non-inverting terminal (+) of the operational amplifier OP4 of the solar cell reset detection unit 9 when the state of the battery 2 is normal, The voltage of the solar cell by the resistor R15 becomes higher than the reference voltage by the resistor R15 and outputs a signal of a high state.

When the OR gate 101 of the solar cell reset latch unit 10 operates to output a control signal, the T flip flop 102 outputs a high signal having a predetermined width by the time constant of the resistor R18 and the capacitor C5 And outputs the pulse to the second NAND gate ND2 of the flip-flop circuit unit 11 to reset the R input to the first NAND gate ND1 so that the signal Q6 output through the inverter I6 is reset. Becomes a low state.

At this time, the output of the operational amplifier OP2 of the solar cell generated voltage sensing unit 4 changes from high to low due to the sunset, and this low signal is output to the third NAND gate ND3 of the comparator 12 .

Therefore, the third NAND gate ND3 of the comparator 12 outputs a high signal to the base of the transistor Tr2 of the lamp driving unit 13 to prevent overdischarge.

The transistor Tr2 is turned on so that the transistors Tr3 and Tr4 of the oscillation driving unit 14 are oscillated with each other due to the counter electromotive force of the transformer T1 and are oscillated according to the winding of the transformer T1 The lamp 8 is boosted to a voltage suitable for lighting the lamp 8.

The battery low voltage sensing unit 6, the battery low voltage latch unit 7, the solar cell reset sensing unit 9 and the solar cell reset latch unit 10 are configured such that the voltage of the storage battery 2 is 12V and 24V Is a circuit for preventing the flicker of the lamp 8 due to a phenomenon in which the voltage of the battery 2 drops temporarily (that is, at a low voltage) when the load is turned on according to the load capacity when the load 2 is turned off.

The efficiency of the present invention for performing the above-described operation and the efficiency of the conventional technology are as follows.

1) The lighting time is determined by an average of 8 hours per day for solar street lamps currently used domestically and overseas. However, the present invention uses the generation voltage of the solar cell as a sensor until sunrise after sunset 100% illumination. In the chart shown in FIG. 4, 14.5 hours were determined as the design data based on December of the longest sunset sunrise time.

2) The solar radiation standard was applied to the Seoul area in the case of the inclination angle of 45 (load condition for winter season), which is the standard of 14.5 hours of illumination during the year.

Inclined slope of December: 2.84kmh / m ² _. day

3) The solar cell capacity calculation is based on the M55 (50WP), a product developed and produced by LG (LG), the most suitable product among domestic products when charging 12V battery. The light is applied to 36W SOX-E 36W), the energy consumption is calculated as follows.

Solar cell capacity = (load X use time) / solar irradiation X device increase efficiency

Solar cell quantity = solar cell capacity / 500WP

Finally, the comparison results between the prior art and the present invention for various efficiency such as the charge regulator efficiency, the inverter efficiency and the ballast efficiency are as shown in FIG.

The required capacity of the battery,

Capacity required for the battery = (X load time during load X use) / (Battery discharge depth X charge / discharge efficiency X Total efficiency of device)

However, the discharge depth is 0.6, the charge and discharge efficiency is 0.85, and the relief time is 3 days.

A comparison of the conventional and the present invention with respect to the required capacity of the battery is as shown in FIG.

As described above, the present invention uses a charging and discharging characteristic of a battery to supply a constant voltage to the battery when converting the power generated from the solar cell into a voltage corresponding to the cell of the battery when the battery is charged, And prevents the loss of the electrode plate due to excessive discharge of the battery and boosts the AC power required for the low-pressure sodium lamp from the DC power supply to the AC power supply using the resonance type oscillation circuit to supply the necessary power to the lamp Thereby improving the efficiency.

Claims (8)

A solar cell directly converting solar energy into electric energy and generating the converted electric power; A storage battery for storing power generated in the solar cell; An overcharging prevention unit for detecting a state of charging the battery, turning off the full-contact non-contact element to prevent charging, and turning on the non-contact element to charge the battery when the voltage drops to the battery; A solar cell generation voltage sensing unit for sensing power generated from the solar cell and comparing the solar cell voltage with a reference voltage and outputting a solar cell generation voltage comparison signal; A non-contact element is turned on or off according to a control signal of the overcharge protection unit to charge / discharge the battery; A battery low voltage sensing unit for outputting a battery low voltage signal when the capacitor is in a low-charged state due to climatic conditions; A battery low voltage latch unit for outputting a pulse having a predetermined width when a battery low voltage signal generated by the battery low voltage sensing unit is inputted; A solar cell reset detection unit for generating a solar cell reset signal when the solar cell is in a normal state; A solar cell reset latch unit for outputting a pulse having a predetermined width when a solar cell reset signal generated by the solar cell reset detection unit is input; A flip-flop circuit unit for latching signals output from the battery low voltage latch unit and the solar cell reset latch unit; A comparison unit for comparing a solar cell generation voltage comparison signal of the solar cell generation voltage sensing unit with a latch signal of the flip-flop circuit unit and outputting a comparison signal corresponding thereto; An overdischarge prevention and lamp driving unit for controlling the lamp on / off so as to prevent over discharge according to the comparison output of the comparison unit, And an oscillation driving unit for turning on or off the lamp according to the output of the over-discharge preventing and lamp driving unit 913. [ The solar cell module according to claim 1, wherein the overcharge-proof non-contact portion comprises: a contactless element for turning on or off according to a control signal to charge or shut off the output voltage of the solar cell to the battery; And a capacitor and a resistor connected in parallel between the contactless element and the solar cell. The apparatus of claim 1, wherein the battery low voltage sensing unit comprises an operational amplifier that compares a battery charging voltage charged in the battery with a reference voltage. [2] The apparatus of claim 1, wherein the battery low voltage latch unit comprises: a Noah gate for receiving a battery low voltage detection signal at one side of the 0 inverting terminal and for receiving a ground signal at the other side thereof; And a T flip-flop which operates in accordance with an output signal of the Noah gate and outputs a predetermined pulse having a width equal to a time constant by a resistor and a capacitor. The apparatus of claim 1, wherein the solar cell reset detection unit comprises an operational amplifier for comparing the charging voltage of the solar cell charged in the solar cell with a reference voltage. The solar cell of claim 1, wherein the solar cell reset latch unit comprises: a Noah gate for inputting a beacon battery reset detection signal to one side and receiving a charge voltage of the battery as an inverting terminal of the other side; And a T flip-flop which operates in accordance with an output of the Noah gate and outputs a predetermined pulse having a width equal to a time constant by a resistor and a capacitor. 2. The apparatus of claim 1, wherein the comparing unit comprises a NAND gate. 2. The control device of a streetlight according to claim 1, wherein the over-discharge preventing and lamp driving unit comprises a transistor.