CN202231920U

CN202231920U - Light-emitting diode (LED) light-operated street lamp

Info

Publication number: CN202231920U
Application number: CN2011203558721U
Authority: CN
Inventors: 任永斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-09-22
Filing date: 2011-09-22
Publication date: 2012-05-23
Anticipated expiration: 2021-09-22

Abstract

A light-emitting diode (LED) light-operated street lamp is composed of an alternating current power supply, a current-limit rectifying circuit, a photosensitive control circuit and a load circuit. The current-limit rectifying circuit converts alternating current into a direct current power supply through capacitance current limitation and diode rectification. The load circuit is an LED string composed of LEDs in series. The photosensitive control circuit formed by a photosensitive element alone, or the photosensitive element and the photosensitive element, a resistor, a triode, a field effect pipe and controllable silicon controls current flowing through loads directly and is connected with the load circuit. By means of the scheme, service life of the street lamp is greatly prolonged, a sound control portion is omitted, the street lamp does not need to be frequently turned on or turned off by stamping, hand clapping, roaring and the like so as to prevent the noise from interrupting rest of residents, and energy-saving performance is also obtained. Compared with the existing circuits of light and sound controlled street lamps, the circuit is simple, low in breakdown rate, long in service life and suitable for situations such as working places, families and the like.

Description

A kind of LED Light control road lamp

Affiliated technical field

The utility model relates to a kind of Light control road lamp, especially uses LED as illuminating source and use light-sensitive element itself or light-sensitive element makes up with resistance, triode, FET, controllable silicon and controls the Light control road lamp that street lamp is bright, put out.

Background technology

At present, as street lamp, sound and light controlled delay switch uses relatively extensively; Its operation principle is the switch with sound and illuminance control lamp; When the brightness of environment reaches certain below the set point, the noise of environment surpasses certain value simultaneously, and this switch will be opened; Sonic-opticalcon trolled switch must possess sound and two conditions of light intensity simultaneously, and switch is just opened.Analyze from the structure of sonic-opticalcon trolled switch, light-sensitive element is equipped with on the switch panel surface, and the letter of post pole body words is equipped with in inside; The same day is subduing to a certain degree, and when sound was arranged, at this moment the Sound and light control switch circuit was just opened; Close behind the time-delay certain hour, sonic-opticalcon trolled switch generally is used for corridor lamp, need not open and close; Sound will start as long as the people passes by, and is convenient, energy-conservation.But owing to start (the sound transmission scope is bigger) according to the sound, and easy misoperation, sound disturbs other people to have a rest easily, and mainly is suitable for conventional bulb, because the sonic-opticalcon trolled switch startup is closed frequently, can shorten the life-span of bulb simultaneously.

The utility model content

For overcome the easy misoperation of existing acousto-optic control street lamp, generation turn on light sound interference other people have a rest, the frequent movement of switch makes the shortcoming of the lost of life of lamp and switch, the utility model provides a kind of LED Light control road lamp and solve this problem, because the LED lamp is very energy-conservation; Several watts to several watts of general unit and family expenses street lamp zero points are just enough, only utilize just light-operatedly, and its power consumption is unlike existing acousto-optic control street lamp height; Adopt the beneficial effect of the utility model to be: the life-span that has prolonged street lamp greatly; Cancelled the acoustic control part, the street lamp frequent switch of sound and the rest that disturbs residents has taken into account energy-conservation simultaneously such as no longer need stamp one's foot, clap hands, roar; Circuit with respect to existing acousto-optic control street lamp; The utility model circuit is more succinct, and failure rate is lower, and the life-span is more permanent.

The utility model solves the technical scheme that its technical problem adopted:

A kind of LED Light control road lamp; Form by AC power, rectifier circuit current limiting, photosensitive control circuit, load circuit; Rectifier circuit current limiting becomes DC power supply through capacitance current-limiting, diode rectification with alternating current; Load circuit becomes light emitting diode string by the light-emitting diode series; By light-sensitive element separately or light-sensitive element make up the size of current of the direct control flows overload of photosensitive control circuit that constitutes with resistance, triode, FET, controllable silicon and link together with load circuit, it specifically connects method has following several kinds of modes: 1, photosensitive control circuit is made up of a light-sensitive element, is connected between positive and negative, the utmost point of DC power supply; Light-emitting diode is serially connected between the DC power supply positive and negative electrode, makes light-sensitive element and light emitting diode string form parallel circuits; 2, photosensitive control circuit is made up of a resistance, a light-sensitive element, a triode; One end of resistance, an end of light-sensitive element, the base stage of triode link together; The emitter of triode and collector electrode connect the positive and negative electrode of DC power supply respectively; Directly between the DC power supply positive and negative electrode, photosensitive control circuit and load circuit form parallel circuits to light emitting diode string; 3, photosensitive control circuit is made up of a resistance, a light-sensitive element, a FET; One end of resistance, an end of light-sensitive element, the grid of FET link together; The drain electrode of FET and source electrode are connected on the positive and negative electrode of DC power supply respectively; Light-emitting diode is serially connected between the DC power supply positive and negative electrode, and photosensitive control circuit and load circuit form parallel circuits; 4, photosensitive control circuit is made up of a resistance, a light-sensitive element, a controllable silicon; One end of resistance, an end of light-sensitive element, silicon controlled grid link together; Silicon controlled anode and negative electrode are connected on respectively between the positive and negative electrode of DC power supply; Light-emitting diode is serially connected between the DC power supply positive and negative electrode, and photosensitive control circuit and load form parallel circuits; 5, photosensitive control circuit is made up of a resistance, a light-sensitive element, a triode; One end of resistance, an end of light-sensitive element, the base stage of triode link together; The emitter of triode and collector electrode are connected respectively between the negative pole of dc power cathode and light emitting diode string, make load circuit and photosensitive control circuit form series circuit; 6, photosensitive control circuit is made up of a resistance, a light-sensitive element, a FET; One end of resistance, an end of light-sensitive element, the grid of FET link together; The drain electrode of FET and source electrode are connected respectively between the negative pole of dc power cathode and light emitting diode string, make load circuit and photosensitive control circuit form series circuit; 7, photosensitive control circuit is made up of a resistance, a light-sensitive element, a controllable silicon; One end of resistance, an end of light-sensitive element, the silicon controlled control utmost point link together; The silicon controlled anode is connected to the negative pole of light emitting diode string; Negative electrode connects the negative pole of DC power supply, makes load circuit and photosensitive control circuit form series circuit; 8, photosensitive control circuit is made up of a resistance, a light-sensitive element, a triode; One end of resistance, an end of light-sensitive element, the base stage of triode link together; Transistor emitter, collector electrode are connected respectively between the positive pole of positive pole and light emitting diode string of DC power supply, make photosensitive control circuit and load circuit form series circuit; 9, photosensitive control circuit is made up of a resistance, a light-sensitive element, a FET; One end of resistance, an end of light-sensitive element, the grid of FET link together; Between the positive pole that the source electrode of FET and drain electrode are connected on DC power supply respectively and the positive pole of light emitting diode string, make photosensitive control circuit and load circuit formation series circuit; 10, photosensitive control circuit is made up of a resistance, a light-sensitive element, a controllable silicon; One end of resistance, an end of light-sensitive element, the silicon controlled control utmost point link together; The silicon controlled anode is connected to the positive pole of DC power supply; Negative electrode is connected to the positive pole of light emitting diode string, makes photosensitive control circuit and load circuit form series circuit.

The technical scheme that the utility model adopts will conjunction with figs. elaborate in specific embodiments.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for first kind.

1. AC powers among the figure, 2. rectifier circuit current limiting, 3. photosensitive control circuit, 4. load circuit.

Fig. 2 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for second kind.

Fig. 3 be the utility model photosensitive control circuit the third connect the method circuit theory diagrams.

Fig. 4 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 4th kind.

Fig. 5 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 5th kind.

Fig. 6 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 6th kind.

Fig. 7 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 7th kind.

Fig. 8 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 8th kind.

Fig. 9 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 9th kind.

Figure 10 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the tenth kind.

Embodiment

In Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, we are that example further specifies the utility model to implement a kind of LED Light control road lamp:

Fig. 1 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for first kind, and AC power 1 among the figure (dotted line part) is generally civil power 220V; The current limliting of rectifier circuit current limiting 2 (dotted line part) is accomplished by capacitor C 1; Size of current in the capacitive reactance size decision-making circuit of C1; D1, D2, D3, D4 form bridge rectifier, with alternating current become DC power supply (be convenient narration, after directly claim DC power supply with the DC power supply after the alternating current conversion; Supply load to use down together); Photosensitive control circuit 3 (dotted line part) is made up of a light-sensitive element LDR, is connected between the positive and negative electrode of DC power supply; Load circuit 4 (dotted line part) is formed light emitting diode string by LED1, LED2, LED3, LED4, LED5, LED6; Only drawn among the figure six; The number of light-emitting diode can be installed according to concrete needs in the string, and the positive pole of that diode that the diode string links to each other with external circuit is called the positive pole (same down) of diode string; The negative pole of that diode that links to each other with external circuit is claimed the negative pole (down together) of diode string; The anodal dc power anode of diode string, the negative pole of diode string connect dc power cathode (ground connection), and capacitor C 2 plays the effect of filtering; Because light-emitting diode is serially connected between the DC power supply positive and negative electrode, make light-sensitive element LDR and light emitting diode string form parallel circuits.When daytime, light was stronger; Light-sensitive element SDR is low resistive state, and voltage reduces between the both positive and negative polarity of rectifier circuit current limiting output, can't enough operating voltages be provided for load circuit; Arrive when evening; Extraneous light deepening, light-sensitive element SDR is high-impedance state, can normal working voltage be provided for load; When implementing, must consider the withstand voltage and power of light-sensitive element, meet the demands through the quantity that increases and decreases light-emitting diode.

Fig. 2 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for second kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a triode VT; The base stage of one end of resistance R, the end of light-sensitive element LDR, triode VT links together; The emitter of triode VT and collector electrode connect the positive and negative electrode of DC power supply respectively; Light-emitting diode is serially connected between the DC power supply positive and negative electrode, and photosensitive control circuit 3 forms parallel circuits with load 4.When daytime, light was stronger, light-sensitive element SDR was low resistive state, triode VT conducting; Electric current is by the triode bypass, and the electric current that flows through the light emitting diode string in the load circuit 4 is very little, and light emitting diode string is not luminous; Arrive when evening, extraneous light deepening, light-sensitive element SDR is high-impedance state; Arrive to a certain degree when resistance is high, triode VT does not have base current or base current is very little, and most of electric current is through the light emitting diode string in the load 4; Light emitting diode string is luminous, and certainly, use PNP class triode is the same can realize bypass functionality (not drawing accompanying drawing); Only need be with emitter and the collector electrode switch of triode VT, light-sensitive element LDR, resistance R switch just can be realized.

Fig. 3 be the utility model photosensitive control circuit the third connect the method circuit theory diagrams.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a FET V; The grid of one end of resistance R, the end of light-sensitive element LDR, FET V links together; The drain electrode of FET V and source electrode are connected on the positive and negative electrode of DC power supply respectively; Light-emitting diode is serially connected between the DC power supply positive and negative electrode, and photosensitive control circuit 3 forms parallel circuits with load circuit 4.When daytime, light was stronger, light-sensitive element SDR was low resistive state, the drain-source conducting of FET V, and electric current is by the FET bypass; The electric current that flows through the light emitting diode string in the load circuit 4 is very little, and light emitting diode string is not luminous, arrives when evening; Extraneous light deepening, light-sensitive element SDR is high-impedance state, arrives to a certain degree when light-sensitive element resistance is high; FET V does not have drain current or drain current is very little, and most of electric current is through the light emitting diode string in the load 4, and light emitting diode string is luminous; Certainly, use the difference of the FET of N raceway groove and P raceway groove to be that light-sensitive element LDR and R switch get final product (a kind of situation of only drawing among the figure).

Fig. 4 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 4th kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a controllable silicon SCR; One end of resistance R, the end of light-sensitive element LDR, the grid of controllable silicon SCR link together; The anode of controllable silicon SCR and negative electrode are connected on respectively between the positive and negative electrode of DC power supply; Light-emitting diode is serially connected between the DC power supply positive and negative electrode, and photosensitive control circuit 3 forms parallel circuits with load 4.When daytime, light was stronger, light-sensitive element SDR was low resistive state, the conducting of controllable silicon SCR; Electric current is by the controllable silicon SCR bypass, and the electric current that flows through the light emitting diode string in the load circuit 4 is very little, and light emitting diode string is not luminous; Arrive when evening, extraneous light deepening, light-sensitive element SDR is high-impedance state; Controllable silicon SCR is not triggered, and most of electric current is through the light emitting diode string in the load 4, and light emitting diode string is luminous.

Fig. 5 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 5th kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a triode VT; One end of resistance R, the end of light-sensitive element LDR, the base stage of triode link together; The emitter of triode and collector electrode are connected respectively between the negative pole of dc power cathode and light emitting diode string, make load circuit 4 and photosensitive control circuit 3 form series circuit.When daytime, light was stronger, light-sensitive element SDR was low resistive state, and triode VT base stage is low-voltage state, and base current is very little; The electric current that flows through triode VT is very little, owing to be series circuit, the electric current of diode string that flows through load circuit 4 is also very little, the diode string stop luminous or luminous very a little less than; Arrive when evening, extraneous light deepening, light-sensitive element SDR is high-impedance state; Transistor base is the high voltage state, and it is big that base current becomes, and the electric current that flows through the load light emitting diode string also becomes big; The load operate as normal, if use the triode of PNP, the position that base stage and transmitter exchange exchange light-sensitive element LDR and resistance R simultaneously gets final product.

Fig. 6 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 6th kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a FET V; The grid of one end of resistance R, the end of light-sensitive element LDR, FET V links together; The drain electrode of FET V and source electrode are connected respectively between the negative pole of dc power cathode and light emitting diode string, make load circuit 4 and photosensitive control circuit 3 form series circuit.When daytime, light was stronger, light-sensitive element SDR was low resistive state, and FET V grid is low-voltage state, and the drain-source current that flows through FET V is very little; The electric current that is equivalent to the light emitting diode string that flows through load circuit 4 is very little, the diode string stop luminous or luminous very a little less than, arrive extraneous light deepening when evening; Light-sensitive element SDR is high-impedance state, and FET V grid is the high voltage state, and it is big that drain-source current becomes, owing to be series circuit; Load current also becomes greatly, and the load operate as normal is no matter the FET of N raceway groove or P raceway groove can; Difference is, the place-exchange of the drain-source utmost point, and the place-exchange of light-sensitive element LDR and resistance R gets final product simultaneously.

Fig. 7 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 7th kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a controllable silicon SCR; The control utmost point of one end of resistance R, the end of light-sensitive element LDR, controllable silicon SCR links together; The anode of controllable silicon SCR is connected to the negative pole of light emitting diode string; Negative electrode connects the negative pole of DC power supply, makes load circuit 4 and photosensitive control circuit 3 form series circuit.When daytime, light was stronger, light-sensitive element SDR was low resistive state, and the controllable silicon SCR control utmost point is low-voltage state, and controllable silicon is not triggered; The electric current that is equivalent to the light emitting diode string that flows through load circuit 4 is very little, the diode string stop luminous or luminous very a little less than, arrive extraneous light deepening when evening; Light-sensitive element SDR is high-impedance state, and the controllable silicon SCR control utmost point is the high voltage state, and controllable silicon is triggered, owing to be series circuit; Load current also becomes greatly, the load operate as normal, and what use among the figure is one-way SCR; Also can use bidirectional triode thyristor, the same can achieving the goal, just cost is slightly higher.

Fig. 8 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 8th kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a triode VT; The base stage of one end of resistance R, the end of light-sensitive element LDR, triode VT links together; Triode VT emitter, collector electrode are connected respectively between the positive pole of positive pole and light emitting diode string of DC power supply, make photosensitive control circuit 3 and load circuit 4 form series circuits.When daytime, light was stronger, light-sensitive element SDR was low resistive state, and triode VT base current is very little, and the electric current that flows through transistor collector, emitter is very little; Owing to be series circuit, the electric current of light emitting diode string that flows through load circuit 4 is also very little, the diode string stop luminous or luminous very a little less than, arrive when evening; Extraneous light deepening, light-sensitive element SDR is high-impedance state, and it is big that triode VT base current becomes; Owing to be series circuit, load current also becomes greatly, the load operate as normal; The NPN pipe that only drawn among the figure will use the PNP pipe, only needs the position of commutative set electrode and transmitter and the position of light-sensitive element LDR and resistance R to get final product.

Fig. 9 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the 9th kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a FET V; The grid of one end of resistance R, the end of light-sensitive element LDR, FET V links together; Between the positive pole that the source electrode of FET V and drain electrode are connected on DC power supply respectively and the positive pole of light emitting diode string, make photosensitive control circuit 3 and load circuit 4 formation series circuits.When daytime, light was stronger, light-sensitive element SDR was low resistive state, and FET V grid voltage is very little, and drain-source current is very little; Owing to be series circuit, the electric current of light emitting diode string that flows through load circuit is also very little, the diode string stop luminous or luminous very a little less than; Arrive when evening, extraneous light deepening, light-sensitive element SDR is high-impedance state; It is big that FET V grid voltage becomes, and drain-source current also becomes greatly, the load operate as normal; No matter using the N raceway groove still is that the FET of P raceway groove is all right, drain-source utmost point place-exchange just, the place-exchange of light-sensitive element LDR and resistance R gets final product simultaneously.

Figure 10 is that the utility model photosensitive control circuit connects the method circuit theory diagrams for the tenth kind.AC power 1 is generally civil power 220V among the figure; The current limliting of rectifier circuit current limiting 2 is accomplished by capacitor C 1, the size of current in the capacitive reactance size decision-making circuit of C1, and D1, D2, D3, D4 form bridge rectifier, and alternating current is become direct current, supply load to use; Photosensitive control circuit 3 is made up of a resistance R, a light-sensitive element LDR, a controllable silicon SCR; The control utmost point of one end of resistance R, the end of light-sensitive element LDR, controllable silicon SCR links together; The anode of controllable silicon SCR is connected to the positive pole of DC power supply; Negative electrode is connected to the positive pole of light emitting diode string, makes photosensitive control circuit 3 and load circuit 4 form series circuit.When daytime, light was stronger, light-sensitive element SDR was low resistive state, and controllable silicon SCR control pole tension is very little; Controllable silicon is not triggered, owing to be series circuit, the electric current of light emitting diode string that flows through load circuit is also very little; The diode string not luminous or luminous very a little less than, arrive extraneous light deepening when evening; Light-sensitive element SDR is high-impedance state, and it is big that controllable silicon SCR control pole tension becomes, the controllable silicon SCR conducting that is triggered; The light emitting diode string operate as normal uses the bidirectional triode thyristor also can be real certainly, and just cost is slightly high.

Claims

1.1. LED Light control road lamp; Form by AC power (1), rectifier circuit current limiting (2), photosensitive control circuit (3), load circuit (4); It is characterized in that: load circuit (4) becomes light emitting diode string by the light-emitting diode series, and photosensitive control circuit (3) connects with load circuit (4).

2.2. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a light-sensitive element LDR; Be connected between positive and negative, the utmost point of DC power supply; Light-emitting diode is serially connected between the DC power supply positive and negative electrode, makes light-sensitive element LDR and light emitting diode string form parallel circuits.

3.3. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a triode VT; The base stage of one end of resistance R, the end of light-sensitive element LDR, triode VT links together; The emitter of triode VT and collector electrode connect the positive and negative electrode of DC power supply respectively; Directly between the DC power supply positive and negative electrode, photosensitive control circuit (3) forms parallel circuits with load circuit (4) to light emitting diode string.

4. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a FET V; The grid of one end of resistance R, the end of light-sensitive element LDR, FET V links together; The drain electrode of FET V and source electrode are connected on the positive and negative electrode of DC power supply respectively, and light-emitting diode is serially connected between the DC power supply positive and negative electrode, and photosensitive control circuit (3) forms parallel circuits with load circuit (4).

5. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a controllable silicon SCR; One end of resistance R, the end of light-sensitive element LDR, the grid of controllable silicon SCR link together; The anode of controllable silicon SCR and negative electrode are connected on respectively between the positive and negative electrode of DC power supply, and light-emitting diode is serially connected between the DC power supply positive and negative electrode, and photosensitive control circuit (3) forms parallel circuits with load (4).

6. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a triode VT; The base stage of one end of resistance R, the end of light-sensitive element LDR, triode VT links together; The emitter of triode VT and collector electrode are connected respectively between the negative pole of dc power cathode and light emitting diode string, make load circuit (4) and photosensitive control circuit (3) form series circuit.

7. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a FET V; The grid of one end of resistance R, the end of light-sensitive element LDR, FET V links together; The drain electrode of FET V and source electrode are connected respectively between the negative pole of dc power cathode and light emitting diode string, make load circuit (4) and photosensitive control circuit (3) form series circuit.

8. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a controllable silicon SCR; The control utmost point of one end of resistance R, the end of light-sensitive element LDR, controllable silicon SCR links together; The anode of controllable silicon SCR is connected to the negative pole of light emitting diode string, and negative electrode connects the negative pole of DC power supply, makes load circuit (4) and photosensitive control circuit (3) form series circuit.

9. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a triode VT; The base stage of one end of resistance R, the end of light-sensitive element LDR, triode VT links together; Triode VT emitter, collector electrode are connected respectively between the positive pole of positive pole and light emitting diode string of DC power supply, make photosensitive control circuit (3) and load circuit (4) form series circuit.

10. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a FET V; The grid of one end of resistance R, the end of light-sensitive element LDR, FET V links together; Between the positive pole that the source electrode of FET V and drain electrode are connected on DC power supply respectively and the positive pole of light emitting diode string, make photosensitive control circuit (3) and load circuit (4) formation series circuit.

11. a kind of LED Light control road lamp as claimed in claim 1; It is characterized in that: photosensitive control circuit (3) is made up of a resistance R, a light-sensitive element LDR, a controllable silicon SCR; The control utmost point of one end of resistance R, the end of light-sensitive element LDR, controllable silicon SCR links together; The anode of controllable silicon SCR is connected to the positive pole of DC power supply, and negative electrode is connected to the positive pole of light emitting diode string, makes photosensitive control circuit (3) and load circuit (4) form series circuit.