CN211267160U

CN211267160U - Light-operated circuit and driving power supply

Info

Publication number: CN211267160U
Application number: CN201922325403.4U
Authority: CN
Inventors: 王宗友; 潘宗禹; 江军
Original assignee: Guangdong Songsheng Power Technology Co ltd
Current assignee: Guangdong Songsheng Power Technology Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-08-14
Anticipated expiration: 2029-12-23

Abstract

The utility model relates to a light-operated circuit and drive power supply, include: the photoelectric conversion circuit comprises a first power supply circuit, a second power supply circuit, a photoelectric conversion circuit, a control circuit and a power control chip. In the light control circuit, a first power supply circuit is connected with the photoelectric conversion circuit and supplies power to the photoelectric conversion circuit; the second power supply circuit is connected with the power control chip through the control circuit and supplies power to the power control chip; the photoelectric conversion circuit is connected with the control circuit, converts the illumination intensity of the external environment into corresponding voltage to trigger the control circuit to work, and the control circuit is used for controlling the start and stop of the power control chip. The light control circuit has simple structure, can be highly fused with the driving power supply, and the driving power supply is matched with the design of the lamp without an external light control mechanism, thereby simplifying the design of the lamp and saving the cost; the light-operated circuit is practical and reliable, the light-operated sensitivity is high, and the practicability of the light-operated lamp is greatly improved.

Description

Light-operated circuit and driving power supply

Technical Field

The utility model relates to a LED drive power supply field especially relates to a light-operated circuit and drive power supply.

Background

The LED lighting has the unique advantages of high efficiency, energy conservation, environmental protection, long service life and the like, gradually replaces the traditional lighting in recent years, and is more and more widely applied to various lighting fields. The LED driving power supply serving as the LED lighting core is matched with a sensor technology to realize intelligent control, so that energy can be further saved, and the service life of the lamp can be prolonged.

In an urban lighting system, due to the change of the length of day and night in four seasons and the change of dark weather, the phenomena of dark weather, no light or bright weather and bright light often occur, so that huge electric energy waste is caused, the daily life of people is influenced, the urban image is damaged, and the social security and traffic safety are influenced. If the lighting system can be started according to the intensity of the ambient light, the lighting time of the lamp can be automatically adjusted to achieve the purpose of energy conservation. The light-operated LED driving power supply detects the illumination intensity of the external environment through a photosensitive element, and the output of the driving power supply is closed when the illumination intensity reaches a shutdown threshold value; when the illumination intensity is smaller than the shutdown threshold value, the driving power supply works normally, so that the automatic control of the lamp is realized, and the driving power supply can be widely applied to road illumination and public area illumination.

However, the existing light-controlled LED lamp has the following drawbacks:

1. the light control part exists independently of a driving power supply, and is arranged outside the lamp as a complete system, so that the appearance and the volume of the lamp are changed, the cost is high, and the volume is large;

2. a light flash near the light control threshold or a sensitivity to rapidly changing light from the external environment causes a flicker.

The defects or problems greatly influence the actual use experience of the product, thereby reducing the practicability of the product.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in that, to prior art's defect, a light-operated circuit and drive power supply are provided.

The utility model provides a technical scheme that its technical problem adopted is: a light control circuit is constructed, which comprises a first power supply circuit, a second power supply circuit, a photoelectric conversion circuit, a control circuit and a power control chip,

the first power supply circuit is connected with the photoelectric conversion circuit, and the second power supply circuit is connected with the control circuit; one path of the output end of the photoelectric conversion circuit is connected with the control circuit, and one path of the output end of the photoelectric conversion circuit is grounded; one path of the output end of the control circuit is connected with the power control chip, and one path of the output end of the control circuit is grounded;

the first power supply circuit supplies power to the photoelectric conversion circuit, and the second power supply circuit supplies power to the power control chip; the photoelectric conversion circuit converts the illumination intensity of the external environment into corresponding voltage to trigger the control circuit to work; when the illumination intensity of the external environment is gradually increased and the voltage received by the control circuit is higher than a preset threshold value, the power supply of the second power supply circuit to the power control chip is cut off; when the illumination intensity of the external environment is gradually weakened, the voltage received by the control circuit is lower than a preset threshold value, and the second power supply circuit is controlled to normally supply power to the power control chip.

Preferably, the control circuit comprises a switching circuit and a controllable voltage stabilizing circuit connected with the switching circuit;

the switch circuit comprises a sixth resistor R6, a seventh resistor R7 and a fourth triode Q4;

the seventh resistor R7 is connected between the collector and the base of the fourth triode Q4; a connection point of a collector of the fourth triode Q4 and the seventh resistor R7 is connected to the second power supply circuit, a connection point of a base electrode of the fourth triode Q4 and the seventh resistor R7 is connected to the controllable voltage stabilizing circuit through the sixth resistor R6, and an emitter of the fourth triode Q4 is connected to a pin VCC of the power control chip;

when the controllable voltage stabilizing circuit is switched on, the base voltage of the fourth triode Q4 is pulled low, the fourth triode Q4 is cut off, and the fourth triode Q4 cuts off the power supply of the second power supply circuit to the power control chip.

Preferably, the controllable voltage stabilizing circuit comprises a controllable precise voltage stabilizing source U1;

the reference electrode of the controllable precise voltage-stabilizing source U1 is connected with the photoelectric conversion circuit, the cathode of the controllable precise voltage-stabilizing source U1 is connected with the base electrode of the fourth triode Q4 through the sixth resistor R6, and the anode of the controllable precise voltage-stabilizing source U1 is grounded;

and the reference pole of the controllable precise voltage-stabilizing source U1 is conducted when the voltage received by the reference pole is higher than the preset threshold value.

Preferably, the photoelectric conversion circuit comprises a phototriode Q1, a fifth resistor R5 and a third capacitor C3 which are connected in parallel;

the collector of the phototriode Q1 is connected with a first power supply circuit, and the emitter of the phototriode Q1 is connected with a first parallel node of the fifth resistor R5 and the third capacitor C3 which are connected in parallel and then connected with the reference electrode of the controllable precision voltage-stabilizing source U1; a second parallel node of the parallel-connected fifth resistor R5 and third capacitor C3 is grounded;

when the illumination intensity of the external environment is gradually increased, the output current of the phototriode Q1 is increased, the voltage at two ends of the fifth resistor R5 is increased, and when the voltage at two ends of the fifth resistor R5 is higher than the preset threshold value of the reference electrode of the controllable precision voltage-stabilizing source U1, the precision voltage-stabilizing tube U1 is conducted; on the contrary, when the illumination intensity of the external environment is gradually reduced, the output current of the phototriode Q1 is reduced, the voltage at two ends of the fifth resistor R5 is reduced, and when the voltage at two ends of the fifth resistor R5 is lower than the preset threshold value of the reference electrode of the controllable precision voltage-stabilizing source U1, the precision voltage-stabilizing tube U1 is cut off.

Preferably, the light control circuit of the present invention includes a hysteresis circuit connected between the first power supply circuit and the photoelectric conversion circuit;

the hysteresis circuit is used for enabling the illumination intensity of the control circuit to be unequal when the control circuit is switched off and switched on;

the hysteresis circuit comprises a fourth resistor R4, an eleventh resistor R11, a second capacitor C2 and a second triode Q2;

the fourth resistor R4 and the second capacitor C2 are connected in parallel between the emitter and the base of the second triode Q2; the emitter of the second triode Q2 is connected with the first power supply circuit, and the base of the second triode Q2 is connected with the photoelectric conversion circuit; the collector of the second triode Q2 is connected to the photoelectric conversion circuit and the control circuit through the eleventh resistor R11.

Preferably, the light control circuit of the present invention further includes an integrating circuit connected between the control circuit and the photoelectric conversion circuit;

the integrating circuit comprises a fourth capacitance C4.

Preferably, the control circuit further comprises a fast start circuit connected between the switching circuit and the controllable voltage stabilizing circuit;

the quick start circuit comprises a third triode Q3;

the collector of the third triode Q3 is connected with the base of the fourth triode Q4 through the sixth resistor R6, the emitter of the third triode Q3 is connected with the cathode of the controllable precision voltage-stabilizing source U1, and the base of the third triode Q3 is connected with the first parallel node of the fifth resistor R5 and the third capacitor C3 which are connected in parallel.

Preferably, the first power supply circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator ZD1, and a first capacitor C1;

the first resistor R1, the second resistor R2 and the third resistor R3 are connected in series and then connected with the cathode of the first voltage-regulator tube ZD1, the anode of the first voltage-regulator tube ZD1 is grounded, the first capacitor C1 is connected in parallel with the two ends of the first voltage-regulator tube ZD1, and the cathode of the first voltage-regulator tube ZD1 is connected with the emitter of the second triode Q2.

Preferably, the second power supply circuit comprises an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a fifth capacitor C5;

the eighth resistor R8, the ninth resistor R9, the tenth resistor R10 and the fifth capacitor C5 are connected in series and then grounded, and a series node of the tenth resistor R10 and the fifth capacitor C5 is connected with a collector of the fourth triode Q4.

The utility model also provides a driving power supply, including foretell light-operated circuit.

Implement the technical scheme of the utility model, following beneficial effect has: the utility model discloses a light-operated circuit mainly realizes through photoelectric conversion circuit and control circuit that lamps and lanterns can carry out automatic control's function according to the change of external environment illumination intensity, makes lamps and lanterns have energy-conserving effect, has prolonged the life of lamps and lanterns simultaneously. In addition, the circuit structure of the light control circuit is simple, the light control circuit is arranged in the driving power supply, and the driving power supply is matched with the lamp to design, so that the lamp does not need an external light control mechanism, the design of the lamp can be simplified, the size of the lamp is reduced, the cost is saved, and the lamp has the beneficial effects of simplicity, practicability and reliability.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural diagram of a first embodiment of a light control circuit provided in the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of a light control circuit provided in the present invention;

fig. 3 is a schematic structural diagram of a third embodiment of a light control circuit provided in the present invention;

fig. 4 is a schematic structural diagram of a fourth embodiment of a light control circuit provided in the present invention;

fig. 5 is a schematic circuit diagram of a third embodiment of a light control circuit provided in the present invention;

fig. 6 is a schematic circuit diagram of a fourth embodiment of a light control circuit provided in the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a light control circuit according to the present invention. As shown in fig. 1, the present invention constructs a light control circuit, which includes a first power supply circuit 10, a second power supply circuit 20, a photoelectric conversion circuit 30, a control circuit 40, and a power control chip 50, wherein,

the first power supply circuit 10 is connected with the photoelectric conversion circuit 30, and the second power supply circuit 20 is connected with the control circuit 40; one path of the output end of the photoelectric conversion circuit 30 is connected with the control circuit 40, and one path of the output end of the photoelectric conversion circuit 30 is grounded; one path of the output end of the control circuit 40 is connected with the power control chip 50, and one path of the output end of the control circuit 40 is grounded;

the first power supply circuit 10 supplies power to the photoelectric conversion circuit 30, and the second power supply circuit 20 supplies power to the power control chip 50; the photoelectric conversion circuit 30 converts the illumination intensity of the external environment into corresponding voltage to trigger the control circuit 40 to work; when the external environment illumination intensity is gradually increased and the voltage received by the control circuit 40 is higher than a preset threshold value, the power supply of the second power supply circuit 20 to the power control chip 50 is cut off; when the external environment illumination intensity gradually decreases and the voltage received by the control circuit 40 is lower than a predetermined threshold, the second power supply circuit 20 is controlled to normally supply power to the power control chip 50.

The working mode can control the working state of the power control chip 50 according to the change of the external illumination intensity, so as to control the lamp to be turned on and off, and the lamp is turned on in time when dark and turned off in time when bright, thereby saving energy and prolonging the service life of the LED lamp.

Used the utility model discloses light-operated circuit's urban lighting system not only practices thrift the electric energy, has promoted citizen's illumination experience, can also promote the city image, strengthen the society peace and security, guarantee traffic safety.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of a light control circuit according to the present invention. As shown in fig. 2, the light control circuit of the present embodiment includes a first power supply circuit 10, a second power supply circuit 20, a photoelectric conversion circuit 30, a control circuit 40, and a power control chip 50;

specifically, the control circuit 40 includes a switching circuit 401 and a controllable voltage stabilizing circuit 402 connected to the switching circuit 401.

The working principle of the embodiment is as follows: when the illumination intensity of the external environment is gradually increased, the current passing through the photoelectric conversion circuit 30 is gradually increased, the output voltage of the photoelectric conversion circuit 30 is also gradually increased, the controllable voltage stabilizing circuit 402 is turned on when the voltage received by the controllable voltage stabilizing circuit is higher than the threshold value of the controllable voltage stabilizing circuit, the switch circuit 401 is turned off, and the second power supply circuit 20 stops the power supply of the power control chip 50 when the switch circuit 401 is turned off; when the light intensity of the external environment is gradually reduced, the current passing through the photoelectric conversion circuit 30 is gradually reduced, the output voltage of the photoelectric conversion circuit 30 is gradually reduced, the controllable voltage stabilizing circuit 402 is turned off when the voltage received by the controllable voltage stabilizing circuit is lower than the threshold value of the controllable voltage stabilizing circuit, the switch circuit 401 is turned on accordingly, and when the switch circuit 401 is turned on, the second power supply circuit 20 normally supplies power to the power control chip 50 through the switch circuit 401.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a third embodiment of a light control circuit according to the present invention. As shown in fig. 3, the light control circuit of the present embodiment further includes a hysteresis circuit 60 connected between the first power supply circuit 10 and the photoelectric conversion circuit 30 on the basis of the second embodiment;

the hysteresis circuit 60 is used to make the illumination intensity of the control circuit 40 when turned off and turned on unequal, thereby effectively solving the problem of flashing of the LED lamp near the light control threshold.

It can be understood that, although the controllable voltage stabilizing circuit 402 has only one preset threshold, due to the existence of the hysteresis circuit 60, when the external illumination intensity is changed from weak to strong, the illumination intensity when the output voltage of the photoelectric conversion circuit 30 is increased to the preset threshold is not equal to the illumination intensity when the external illumination intensity is changed from strong to weak, and the output voltage of the photoelectric conversion circuit 30 is decreased to the preset threshold, so as to prevent the photoelectric conversion circuit 30 from outputting the control voltage to control the on/off of the controllable voltage stabilizing circuit 402 only at the same illumination intensity, that is, at one light-controlled threshold. By arranging the hysteresis circuit 60, the photoelectric conversion circuit 30 can output control voltage to control the on-off of the controllable voltage stabilizing circuit 402 at two different illumination intensities, namely two different light-operated thresholds, so that the problem of light flash of the LED lamp near the light-operated thresholds can be avoided.

The arrangement of the hysteresis circuit 60 can greatly improve the use experience of the lamp product using the light control circuit, and enhance the usability of the product.

Preferably, the light control circuit of the present embodiment further includes an integrating circuit 70 connected between the control circuit 40 and the photoelectric conversion circuit 30; the integrating circuit 70 can play an anti-interference role, and can avoid lamp flashing caused by rapid change of the illumination intensity of the external environment.

The light control circuit of this embodiment sets up integrator circuit 70 and makes lamps and lanterns avoid dodging because of the lamp that leads to when external environment illumination intensity rapid change dodges, not only can prevent that lamps and lanterns from damaging because of the lamp is dodged, can also prevent to make pedestrian or driver vision confusion and then lead to the emergence of incident because of sudden lamp is dodged.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a fourth embodiment of a light control circuit according to the present invention. As shown in fig. 4, the rf transceiver circuit of the present embodiment is based on the second embodiment or the third embodiment, and further,

the fast start circuit 403 is further included, and the fast start circuit 403 can increase the start speed of the power control chip 50, thereby reducing the start time of the driving power supply.

Referring to fig. 5, fig. 5 is a schematic circuit diagram of a third embodiment of a light control circuit according to the present invention. As shown in fig. 5, specifically:

the switch circuit 401 includes a sixth resistor R6, a seventh resistor R7, and a fourth transistor Q4;

the seventh resistor R7 is connected between the collector and the base of the fourth triode Q4; the connection point of the collector of the fourth triode Q4 and the seventh resistor R7 is connected to the second power supply circuit 20, the connection point of the base electrode of the fourth triode Q4 and the seventh resistor R7 is connected to the controllable voltage stabilizing circuit 402 through the sixth resistor R6, and the emitter of the fourth triode Q4 is connected to the pin VCC of the power control chip 50;

when the controllable voltage regulator circuit 402 is turned on, the base voltage of the fourth transistor Q4 is pulled low, the fourth transistor Q4 is turned off, and the fourth transistor Q4 cuts off the power supply of the second power supply circuit 20 to the power control chip 50.

The controllable voltage stabilizing circuit 402 comprises a controllable precise voltage stabilizing source U1; specifically, the controllable precision voltage regulator U1 may be a controllable precision voltage regulator TL 431.

The reference electrode of the controllable precise voltage-stabilizing source U1 is connected with the photoelectric conversion circuit 30, the cathode of the controllable precise voltage-stabilizing source U1 is connected with the base electrode of the fourth triode Q4 through a sixth resistor R6, and the anode of the controllable precise voltage-stabilizing source U1 is grounded; and the reference pole of the controllable precise voltage regulator U1 is conducted when the voltage received by the reference pole is higher than the preset threshold value.

The photoelectric conversion circuit 30 comprises a phototriode Q1, a fifth resistor R5 and a third capacitor C3 which are connected in parallel; it can be understood that the phototriode can be replaced by photosensitive elements such as a photodiode and a photoresistor, and the effect is the same; the fifth resistor R5 can be replaced by a potentiometer with the same effect.

The collector of the phototriode Q1 is connected with the first power supply circuit 10, and the emitter of the phototriode Q1 is connected with the first parallel node of the fifth resistor R5 and the third capacitor C3 which are connected in parallel and then connected with the reference electrode of the controllable precision voltage-stabilizing source U1; a second parallel node of the fifth resistor R5 and the third capacitor C3 which are connected in parallel is grounded;

when the illumination intensity of the external environment is gradually enhanced, the output current of the phototriode Q1 is increased, the voltage at the two ends of the fifth resistor R5 is increased, and when the voltage at the two ends of the fifth resistor R5 is higher than the preset threshold value of the reference electrode of the controllable precise voltage-stabilizing source U1, the precise voltage-stabilizing tube U1 is conducted; on the contrary, when the illumination intensity of the external environment is gradually reduced, the output current of the phototriode Q1 is reduced, the voltage at the two ends of the fifth resistor R5 is reduced, and when the voltage at the two ends of the fifth resistor R5 is lower than the preset threshold value of the reference pole of the controllable precision voltage-stabilizing source U1, the controllable precision voltage-stabilizing source U1 is cut off.

The hysteresis circuit 60 includes a fourth resistor R4, an eleventh resistor R11, a second capacitor C2, and a second transistor Q2;

the fourth resistor R4 and the second capacitor C2 are connected in parallel between the emitter and the base of the second triode Q2; the emitter of the second triode Q2 is connected with the first power supply circuit 10, and the base of the second triode Q2 is connected with the photoelectric conversion circuit 30; the collector of the second transistor Q2 is connected to the photoelectric conversion circuit 30 and the control circuit 40 via an eleventh resistor R11.

The hysteresis circuit 60 can make the external environment illumination intensity of the closed output and the open output of the driving power supply under the control of the light control circuit unequal, thereby realizing the hysteresis effect.

The hysteresis circuit 60 specifically operates as follows: when the illumination intensity of the external environment is changed from weak to strong, the current flowing through the phototriode Q1 is gradually increased, meanwhile, the current flowing through the fifth resistor R5 is also increased, the voltage at two ends of the fifth resistor R5 is gradually increased, when the voltage is increased to 2.5V, namely the threshold value of the reference electrode of the controllable precision voltage-stabilizing source TL431 is obtained, the controllable precision voltage-stabilizing source U1 is conducted, the base voltage of the fourth triode Q4 is pulled low, the fourth triode Q4 is in a turn-off state, the second power supply circuit 20 cannot provide starting current for the power control chip 50, the power control chip 50 cannot work, the driving power supply is turned off to output, and the illumination intensity is marked as Lx1 at the moment; when the external environment illumination intensity is weakened from strong, the second triode Q2 is gradually switched from an on state to an off state, the controllable precise voltage-stabilizing source U1 is not conducted, then the fourth triode Q4 is in the on state, the power control chip 50 works normally, the driving power supply is turned on to output, the illumination intensity is marked as Lx2, the values of the fourth resistor R4, the fifth resistor R5 and the eleventh resistor R11 are reasonably adjusted, the Lx1 is not equal to the Lx2, namely the driving power supply is not equal to the ambient illumination intensity of the turning-off output and the turning-on output, and the hysteretic effect can be realized.

The integrating circuit 70 includes a fourth capacitance C4;

one end of the fourth capacitor C4 is connected with the cathode of the controllable precise voltage-stabilizing source U1, and the other end is connected with the reference pole of the controllable precise voltage-stabilizing source U1.

The fourth capacitor C4 can play an anti-interference role, for example, when the external environment illumination intensity changes rapidly from weak to strong, the output current of the phototriode Q1 increases rapidly, and voltage spikes are generated at two ends of the fifth resistor R5, at this time, the fourth capacitor C4 can absorb the voltage spikes, so as to prevent the controllable precision voltage regulator U1 from being rapidly switched on and then rapidly switched off, and thus, the phenomenon of lamp flash of the LED and the like is caused.

The first power supply circuit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator ZD1, and a first capacitor C1;

the first resistor R1, the second resistor R2 and the third resistor R3 are connected in series and then connected with the cathode of a first voltage-regulator tube ZD1, the anode of the first voltage-regulator tube ZD1 is grounded, the first capacitor C1 is connected in parallel with the two ends of the first voltage-regulator tube ZD1, and the cathode of the first voltage-regulator tube ZD1 is connected with the emitter of the second triode Q2.

The first power supply circuit 10 is connected with HV +, HV + is rectified voltage, and HV + charges the first capacitor C1 through the first resistor R1, the second resistor R2 and the third resistor R3, and then stabilizes voltage through the first voltage stabilizing tube ZD1 to supply power to the light control part. It is understood that the first resistor R1, the second resistor R2 and the third resistor R3 are respectively arranged in consideration of the withstand voltage and the power of the resistors, and the number of the resistors is not particularly limited, and only a single resistor may be arranged if the single resistor can meet the requirements of the power and the withstand voltage.

The second power supply circuit 20 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a fifth capacitor C5;

The second power supply circuit 20 is connected to HV +, HV + is a rectified voltage, and as can be understood, HV + charges the fifth capacitor C5 through the resistors of the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 to provide an initial starting current for the power control chip 50, normally, the second power supply circuit 20 is also connected to an auxiliary power supply winding of a transformer or other auxiliary power source, and after the power control chip 50 works normally, the auxiliary winding or the auxiliary power source supplies power to the IC.

Referring to fig. 6, fig. 6 is a schematic circuit diagram of a fourth embodiment of the light control circuit according to the present invention. As shown in fig. 6, the integrated circuit includes a first power supply circuit 10, a second power supply circuit 20, a photoelectric conversion circuit 30, a control circuit 40, a power control chip 50, a hysteresis circuit 60, and an integration circuit 70; the control circuit 40 comprises a switching circuit 401 and a controllable voltage stabilizing circuit 402;

preferably, the control circuit 40 further includes a quick start circuit 403;

the fast start circuit 403 includes a third transistor Q3, specifically:

the collector of the third triode Q3 is connected with the base of the fourth triode Q4 through the sixth resistor R6, the emitter of the third triode Q3 is connected with the cathode of the controllable precise voltage-stabilizing source U1, and the base of the third triode Q3 is connected with the fifth resistor R5 and the first parallel node of the third capacitor C3 which are connected in parallel.

The fast start circuit 403 operates on the following principle: when the power supply supplies power, the rectified voltage HV + charges the fifth capacitor C5 through the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10, and if the third transistor Q3 is not provided, the HV + discharges to the ground through the seventh resistor R7, the sixth resistor R6, the fourth capacitor C4 and the fifth resistor C5 while charging the fifth capacitor C5, which may result in an extension of the charging time of the fifth capacitor C5, a reduction in the starting speed of the power control chip 50, and a reduction in the starting time of the driving power supply.

It is understood that the fast start circuit 403 is not a necessary option of the present invention, and may be omitted if the requirement for the start-up time of the driving power is not high.

In addition, the utility model discloses a driving power supply, including the light-operated circuit of above arbitrary description. Specifically, the circuit structure of any light control circuit is simple, the light control circuit can be highly integrated with a driving power supply after being applied to the driving power supply, so that the driving power supply is reliable and practical, the driving power supply is matched with the design of the lamp, the lamp does not need an external light control component, the design of the lamp can be simplified, the size of the lamp is reduced, and the cost is saved.

Of course, the driving power supply using any of the light control circuits can also be used as an independent external light control mechanism of a non-light control lamp to modify the traditional non-light control lamp, so that the high upgrading cost caused by the integral upgrading of the old and old urban lighting system is avoided.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A light control circuit is characterized by comprising a first power supply circuit (10), a second power supply circuit (20), a photoelectric conversion circuit (30), a control circuit (40) and a power control chip (50),

the first power supply circuit (10) is connected with the photoelectric conversion circuit (30), and the second power supply circuit (20) is connected with the control circuit (40); one path of the output end of the photoelectric conversion circuit (30) is connected with the control circuit (40), and one path of the output end of the photoelectric conversion circuit (30) is grounded; one path of the output end of the control circuit (40) is connected with the power control chip (50), and one path of the output end of the control circuit (40) is grounded;

the first power supply circuit (10) supplies power to the photoelectric conversion circuit (30), and the second power supply circuit (20) supplies power to the power control chip (50); the photoelectric conversion circuit (30) converts the illumination intensity of the external environment into corresponding voltage to trigger the control circuit (40) to work; when the external environment illumination intensity is gradually increased and the voltage received by the control circuit (40) is higher than a preset threshold value, the power supply of the second power supply circuit (20) to the power control chip (50) is cut off; when the illumination intensity of the external environment is gradually weakened, the voltage received by the control circuit (40) is lower than a preset threshold value, and the second power supply circuit (20) is controlled to normally supply power to the power control chip (50).

2. The light control circuit according to claim 1, wherein the control circuit (40) comprises a switching circuit (401) and a controllable voltage regulation circuit (402) connected to the switching circuit (401); the switch circuit (401) comprises a sixth resistor R6, a seventh resistor R7 and a fourth triode Q4;

the seventh resistor R7 is connected between the collector and the base of the fourth triode Q4; the connection point of the collector of the fourth triode Q4 and the seventh resistor R7 is connected with the second power supply circuit (20), the connection point of the base electrode of the fourth triode Q4 and the seventh resistor R7 is connected with the controllable voltage stabilizing circuit (402) through the sixth resistor R6, and the emitter of the fourth triode Q4 is connected with the pin VCC of the power control chip (50);

when the controllable voltage stabilizing circuit (402) is switched on, the base voltage of the fourth triode Q4 is pulled low, the fourth triode Q4 is cut off, and the fourth triode Q4 cuts off the power supply of the second power supply circuit (20) to the power control chip (50).

3. The light control circuit according to claim 2, wherein the controllable voltage regulation circuit (402) comprises a controllable precision voltage regulator U1;

the reference electrode of the controllable precise voltage-stabilizing source U1 is connected with the photoelectric conversion circuit (30), the cathode of the controllable precise voltage-stabilizing source U1 is connected with the base electrode of the fourth triode Q4 through the sixth resistor R6, and the anode of the controllable precise voltage-stabilizing source U1 is grounded;

4. The light control circuit according to claim 3, wherein the photoelectric conversion circuit (30) comprises a phototransistor Q1 and a fifth resistor R5 and a third capacitor C3 connected in parallel;

the collector of the phototriode Q1 is connected with a first power supply circuit (10), and the emitter of the phototriode Q1 is connected with a first parallel node of a fifth resistor R5 and a third capacitor C3 which are connected in parallel and then connected with the reference electrode of the controllable precision voltage-stabilizing source U1; a second parallel node of the parallel-connected fifth resistor R5 and third capacitor C3 is grounded;

when the illumination intensity of the external environment is gradually increased, the output current of the phototriode Q1 is increased, the voltage at two ends of the fifth resistor R5 is increased, and when the voltage at two ends of the fifth resistor R5 is higher than the preset threshold value of the reference electrode of the controllable precision voltage-stabilizing source U1, the precision voltage-stabilizing tube U1 is conducted; on the contrary, when the illumination intensity of the external environment is gradually reduced, the output current of the phototriode Q1 is reduced, the voltage at two ends of the fifth resistor R5 is reduced, and when the voltage at two ends of the fifth resistor R5 is lower than the preset threshold value of the reference electrode of the controllable precision voltage-stabilizing source U1, the controllable precision voltage-stabilizing source U1 is cut off.

5. The light control circuit according to claim 1, characterized by comprising a hysteresis circuit (60) connected between the first supply circuit (10) and the photoelectric conversion circuit (30);

the hysteresis circuit (60) is used for enabling the illumination intensity when the control circuit (40) is switched off and switched on to be unequal;

the hysteresis circuit (60) comprises a fourth resistor R4, an eleventh resistor R11, a second capacitor C2 and a second triode Q2;

the fourth resistor R4 and the second capacitor C2 are connected in parallel between the emitter and the base of the second triode Q2; the emitter of the second triode Q2 is connected with the first power supply circuit (10), and the base of the second triode Q2 is connected with the photoelectric conversion circuit (30); the collector of the second triode Q2 is respectively connected with the photoelectric conversion circuit (30) and the control circuit (40) through the eleventh resistor R11.

6. The light control circuit of claim 5, further comprising an integration circuit (70) connected between the control circuit (40) and the photoelectric conversion circuit (30);

the integrating circuit (70) comprises a fourth capacitance C4.

7. The light control circuit according to claim 4, wherein the control circuit (40) further comprises a fast start circuit (403) connected between the switching circuit (401) and the controllable voltage regulation circuit (402);

the fast start circuit (403) comprises a third transistor Q3;

8. The light control circuit according to claim 5, characterized in that the first power supply circuit (10) comprises a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator ZD1, and a first capacitor C1;

9. The light control circuit of claim 2, characterized in that the second supply circuit (20) comprises an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a fifth capacitor C5;

10. A driving power supply comprising the light control circuit of any one of claims 1 to 9.