An optoelectronic control circuit

Abstract

The application discloses a photoelectric control circuit, which comprises a rectification and voltage stabilization circuit, a luminosity detection circuit, a signal analysis circuit, a relay switch circuit and a silicon controlled switch circuit, wherein the rectification and voltage stabilization circuit is connected with the luminosity detection circuit, the relay switch circuit and the signal analysis circuit respectively, the relay switch circuit is further connected with the silicon controlled switch circuit, and the signal analysis circuit is further connected with the silicon controlled switch circuit. The silicon controlled switch is connected in parallel with the relay to ensure low inrush current when the load is switched on at low voltage and no induced arc when the load is switched off at low current. The circuit can operate all HID, halogen, incandescent, LED, solid state, fluorescent lamps and relay loads, and the load life capacity is superior to other products in the market. The double piezoresistance design is sufficient to make the product cope with up to 20KV surge current protection.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic technology, and in particular to an optoelectronic control circuit. Background Technology

[0002] With the upgrading and iteration of lighting systems, traditional resistive lamp loads such as LED lamps and ballasts can no longer meet the needs of most occasions. Currently, capacitive lamp loads and inductive lamp loads (such as HID, halogen, incandescent lamps, LED, solid-state, fluorescent lamps and relay loads) have emerged in some places. These lamp loads will give the relay contacts a large inrush current at the moment of switching on / off, which will reduce the life of the relay contacts and make it difficult to guarantee the performance of the product. Summary of the Invention

[0003] The purpose of this invention is to provide a photoelectric control circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A photoelectric control circuit includes a rectifier and voltage regulator circuit, a photometric detection circuit, a signal analysis circuit, a relay switch circuit, and a thyristor switch circuit. The rectifier and voltage regulator circuit is connected to the photometric detection circuit, the relay switch circuit, and the signal analysis circuit, respectively. The relay switch circuit is also connected to the thyristor switch circuit, and the signal analysis circuit is also connected to the thyristor switch circuit.

[0006] As a further technical solution of the present invention: the rectifier and voltage regulator circuit includes resistor R1, resistor R2, capacitor C1, rectifier bridge BR1, diode Z1, diode Z2, capacitor C2 and capacitor C4. One end of resistor R2 is connected to resistor MOV1, resistor MOV2 and one end of AC power supply. The other end of resistor R2 is connected to one end of resistor R1 and one end of capacitor C1. The other end of resistor R1 is connected to the other end of capacitor C1 and one input terminal of rectifier bridge BR1. The other input terminal of rectifier bridge BR1 is connected to the other end of resistor MOV1, the other end of resistor MOV2 and the other end of AC power supply. The output terminal of rectifier bridge BR1 is connected to the cathode of diode Z1, capacitor C2 and capacitor C4. The anode of diode Z1 is connected to the cathode of diode Z2. The anode of diode Z2 is connected to the other end of capacitor C2, the other end of capacitor C4 and ground terminal.

[0007] As a further technical solution of the present invention: the signal analysis circuit includes chip U1, resistor R3, resistor R9 and resistor R13. One end of resistor R3 is connected to resistor R13 and the output terminal of rectifier bridge BR1. The other end of resistor R3 is connected to resistor R9, resistor R4, pin 3 and pin 5 of chip U1. The other end of resistor R9 is connected to the other end of resistor R13, resistor R5 and pin 1 of chip U1. The other end of resistor R4 is grounded.

[0008] As a further technical solution of the present invention: the chip U1 is model LM2903.

[0009] As a further technical solution of the present invention: the photometric detection circuit includes resistors R7, R8, and R11, transistor Q1 and diode D6. One end of resistor R7 is connected to resistors R8 and R9 and the output terminal of rectifier bridge BR1. The other end of resistor R7 is connected to the other end of resistor R8, the other end of resistor R6, the anode of diode D6 and the collector of transistor Q1. The emitter of transistor Q1 is connected to resistor R11, capacitor C3 and ground. The cathode of diode D6 is connected to the other end of capacitor C3, the other end of resistor R11 and pin 2 of chip U1.

[0010] As a further technical solution of the present invention: the relay switching circuit includes a relay H1 and a diode D5 connected in parallel with it.

[0011] As a further technical solution of the present invention: the thyristor switching circuit includes a rectifier bridge BR2, an optocoupler U7, a resistor R12, a resistor R10, and a thyristor Q4. One input terminal of the rectifier bridge BR2 is connected to the relay H1 and the anode of the diode D5. The output terminal of the rectifier bridge BR2 is connected to the optocoupler U7 through the resistor R12. The optocoupler U7 is also connected to the control electrode of the thyristor Q4 through the resistor R10. The two ends of the thyristor Q4 are respectively connected to the two ends of the contact of the relay H1. The two ends of the contact of the relay H1 are also respectively connected to the load and the AC power supply.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The thyristor switch should be connected in parallel with the relay to ensure low inrush current when the load is turned on under low voltage and no induced arc when the load is turned off under low current.

[0014] 2. This circuit can operate all HID, halogen, incandescent, LED, solid-state, fluorescent and relay loads, and its load life capability is superior to other products on the market;

[0015] 3. The dual varistor design enables the product to withstand surge currents up to 20KV. Attached Figure Description

[0016] Figure 1 This is the circuit diagram of the present invention. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1, referring to Figure 1 A photoelectric control circuit includes a rectifier and voltage regulator circuit, a photometric detection circuit, a signal analysis circuit, a relay switch circuit, and a thyristor switch circuit. The rectifier and voltage regulator circuit is connected to the photometric detection circuit, the relay switch circuit, and the signal analysis circuit, respectively. The relay switch circuit is also connected to the thyristor switch circuit, and the signal analysis circuit is also connected to the thyristor switch circuit.

[0019] The working principle is as follows:

[0020] Rectifier and voltage regulator circuit: reduces the power supply voltage from 105-305VAC to 24VDC;

[0021] Photometric detection circuit: The 24VDC is further reduced to 5.1VDC. This 5.1VDC voltage supplies power to the Q1 photoresistor and the parallel diode, resistor, and capacitor circuit. The resistance of the photoresistor changes with the change in external light intensity, thereby outputting a high / low level.

[0022] Signal analysis circuit: The comparator LM2903 performs logic analysis through pins 1IN+, 1IN-, 2IN+, and 2IN-, and finally provides high / low levels to the 14 relay switch circuit and the 15 thyristor switch circuit;

[0023] Relay switching circuit: The high / low level provided by the signal analysis circuit 13 affects the closing / releasing of the relay contacts, ultimately determining the on / off state of the product load.

[0024] Thyristor switch circuit: After receiving the signal rectified by the signal analysis circuit 13, the optocoupler U7 closes / releases, ultimately determining the conduction / disconnection of the thyristor.

[0025] Example 2, based on Example 1, includes a rectifier and voltage regulator circuit comprising resistor R1, resistor R2, capacitor C1, rectifier bridge BR1, diode Z1, diode Z2, capacitor C2, and capacitor C4. One end of resistor R2 is connected to resistor MOV1, resistor MOV2, and one end of the AC power supply. The other end of resistor R2 is connected to one end of resistor R1 and one end of capacitor C1. The other end of resistor R1 is connected to the other end of capacitor C1 and one input terminal of rectifier bridge BR1. The other input terminal of rectifier bridge BR1 is connected to the other end of resistor MOV1, the other end of resistor MOV2, and the other end of the AC power supply. The output terminal of rectifier bridge BR1 is connected to the cathode of diode Z1, capacitor C2, and capacitor C4. The anode of diode Z1 is connected to the cathode of diode Z2. The anode of diode Z2 is connected to the other end of capacitor C2, the other end of capacitor C4, and the ground terminal.

[0026] The signal analysis circuit includes chip U1, resistors R3, R9, and R13. One end of resistor R3 is connected to resistor R13 and the output terminal of rectifier bridge BR1. The other end of resistor R3 is connected to resistors R9 and R4, pin 3 and pin 5 of chip U1. The other end of resistor R9 is connected to the other end of resistor R13, resistor R5, and pin 1 of chip U1. The other end of resistor R4 is grounded. Chip U1 is an LM2903.

[0027] The photometric detection circuit includes resistors R7, R8, and R11, transistor Q1, and diode D6. One end of resistor R7 is connected to resistors R8 and R9 and the output of rectifier bridge BR1. The other end of resistor R7 is connected to the other end of resistor R8, the other end of resistor R6, the anode of diode D6, and the collector of transistor Q1. The emitter of transistor Q1 is connected to resistor R11, capacitor C3, and ground. The cathode of diode D6 is connected to the other end of capacitor C3, the other end of resistor R11, and pin 2 of chip U1. The relay switching circuit includes relay H1 and diode D5 connected in parallel with it.

[0028] The thyristor switching circuit includes a rectifier bridge BR2, an optocoupler U7, resistors R12 and R10, and a thyristor Q4. One input terminal of the rectifier bridge BR2 is connected to the relay H1 and the anode of diode D5. The output terminal of the rectifier bridge BR2 is connected to the optocoupler U7 through resistor R12. The optocoupler U7 is also connected to the control electrode of the thyristor Q4 through resistor R10. The two ends of the thyristor Q4 are respectively connected to the two ends of the contact of the relay H1. The two ends of the contact of the relay H1 are also connected to the load and the AC power supply, respectively.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A photoelectric control circuit comprising a rectifier-regulator circuit, a luminosity detecting circuit, a signal analyzing circuit, a relay switching circuit and a thyristor switching circuit, characterized in that, The rectifier and voltage regulator circuit is connected to the photometric detection circuit, the relay switch circuit, and the signal analysis circuit, respectively. The relay switch circuit is also connected to the thyristor switch circuit, and the signal analysis circuit is also connected to the thyristor switch circuit. The rectifier and voltage regulator circuit includes resistor R1, resistor R2, capacitor C1, rectifier bridge BR1, diode Z1, diode Z2, capacitor C2, and capacitor C4. One end of resistor R2 is connected to resistor MOV1, resistor MOV2, and one end of the AC power supply. The other end of resistor R2 is connected to one end of resistor R1 and one end of capacitor C1. The other end of resistor R1 is connected to the other end of capacitor C1 and one input terminal of rectifier bridge BR1. The other input terminal of rectifier bridge BR1 is connected to the other end of resistor MOV1, the other end of resistor MOV2, and the other end of the AC power supply. The output terminal of rectifier bridge BR1 is connected to the cathode of diode Z1, capacitor C2, and capacitor C4. The anode of diode Z1 is connected to the cathode of diode Z2. The anode of diode Z2 is connected to the other end of capacitor C2, the other end of capacitor C4, and the ground terminal. The signal analysis circuit includes chip U1, resistors R3, R9 and R13. One end of resistor R3 is connected to resistor R13 and the output terminal of rectifier bridge BR1. The other end of resistor R3 is connected to resistors R9 and R4, pin 3 and pin 5 of chip U1. The other end of resistor R9 is connected to the other end of resistor R13, resistor R5 and pin 1 of chip U1. The other end of resistor R4 is grounded. The thyristor switching circuit includes a rectifier bridge BR2, an optocoupler U7, a resistor R12, a resistor R10, and a thyristor Q4. One input terminal of the rectifier bridge BR2 is connected to the relay H1 and the anode of the diode D5. The output terminal of the rectifier bridge BR2 is connected to the optocoupler U7 through the resistor R12. The optocoupler U7 is also connected to the control electrode of the thyristor Q4 through the resistor R10. The two ends of the thyristor Q4 are respectively connected to the two ends of the contact of the relay H1. The two ends of the contact of the relay H1 are also respectively connected to the load and the AC power supply. The chip U1 is model LM2903; The photometric detection circuit includes resistors R7, R8, and R11, a phototransistor Q1, and a diode D6. One end of resistor R7 is connected to resistors R8 and R9 and the output terminal of rectifier bridge BR1. The other end of resistor R7 is connected to the other end of resistor R8, the other end of resistor R6, the anode of diode D6, and the collector of phototransistor Q1. The emitter of phototransistor Q1 is connected to resistor R11, capacitor C3, and ground. The cathode of diode D6 is connected to the other end of capacitor C3, the other end of resistor R11, and pin 2 of chip U1.

2. The photoelectric control circuit according to claim 1, characterized in that, The relay switching circuit includes a relay H1 and a diode D5 connected in parallel with it.

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