Alternating-current wide-voltage input load series-parallel switching control circuit of lighting module

Abstract

The utility model provides a load series-parallel switching control circuit for alternating current wide voltage input of a lighting module, which is characterized by comprising a power supply input port, a rectifying circuit, a first load, a second load, a first gating switch and a second gating switch, wherein the first gating switch and the second gating switch are respectively connected with the first load and the second load in series; the rectifying circuit is electrically connected with an auxiliary power supply circuit for supplying power to the main control circuit, the first gating switch and the second gating switch, and is also electrically connected with an input voltage sampling circuit for detecting and feeding back the magnitude of the input voltage of the power supply input port; the input voltage sampling circuit is electrically connected with the main control circuit; according to the utility model, the lighting module can be simultaneously suitable for two kinds of AC commercial power voltages of 220V and 110V, lamp beads in the lighting module can be ensured to work normally, the circuit structure is simple and practical, and the production cost of export lighting products can be effectively reduced.

Description

[Technical Field]

[0002] This utility model relates to the field of lighting control, and in particular to a load series-parallel switching control circuit for a lighting module with wide AC voltage input. [Background Technology]

[0004] Because international AC mains voltage is divided into two types, 220V and 110V, lighting modules such as lamps and fan lights need to be designed with two special driver modules for each voltage. This makes exported products with lighting modules unusable internationally. Moreover, the special driver modules generally convert the AC mains power into a constant output voltage before connecting it to the load. Different circuits need to be designed for products with different power ratings, which is complex in structure and costly in design, increasing the difficulty of exporting products and production costs. [Utility Model Content]

[0006] To address the shortcomings of lighting modules that are not universally applicable internationally and cannot be simultaneously used with both 220V and 110V AC mains voltages, this invention provides a load series-parallel switching control circuit for lighting modules with wide AC voltage input.

[0007] This utility model is achieved through the following technical solution:

[0008] A load series-parallel switching control circuit for a wide AC voltage input of a lighting module is characterized by comprising: a power input port for connecting to 220V or 110V AC mains power; a rectifier circuit for converting AC power to DC power; a first load and a second load formed by several light-emitting diodes connected in series; a first selector switch and a second selector switch connected in series with the first load and the second load, respectively; and a main control circuit for controlling the on / off state of the first selector switch and the second selector switch. The rectifier circuit is electrically connected to an auxiliary power supply circuit for supplying power to the main control circuit, the first selector switch, and the second selector switch. It is also electrically connected to an input voltage sampling circuit for detecting and feeding back the magnitude of the input voltage at the power input port. The input voltage sampling circuit is electrically connected to the main control circuit.

[0009] The AC wide voltage input load series-parallel switching control circuit for the lighting module described above is characterized in that: the first selection switch is a relay K1, the second selection switch is a relay K2, and both the first selection switch and the second selection switch are single-pole double-throw relay switches.

[0010] The AC wide voltage input load series-parallel switching control circuit for the lighting module described above is characterized in that: the first selector switch and the second selector switch operate simultaneously under the control of the main control circuit; when the first selector switch and the second selector switch are not operating, pin 4 of relays K1 and K2 is turned on; when the first selector switch and the second selector switch are operating, pin 3 of relays K1 and K2 is turned on; and pin 4 of the first selector switch is electrically connected to pin 4 of the second selector switch.

[0011] The AC wide voltage input load series-parallel switching control circuit for the lighting module described above is characterized in that: the main control circuit includes a microcontroller chip U1, a transistor Q1, and a transistor Q2; the input voltage sampling circuit includes a resistor R31 and a resistor R32; the resistors R31 and R32 are connected in series and then in parallel with the output terminal of the rectifier circuit; the connection terminals of the resistors R31 and R32 are electrically connected to the microcontroller chip U1; the I / O pins of the microcontroller chip U1 are connected in series with resistors R12 and R22 and then electrically connected to the bases of transistors Q1 and Q2; the emitters of transistors Q1 and Q2 are grounded; and the collectors are electrically connected to relays K1 and K2, respectively.

[0012] The AC wide voltage input load series-parallel switching control circuit for the lighting module described above is characterized in that: the auxiliary power supply circuit includes a step-down chip U3 and a voltage regulator chip U2, the step-down chip U3 is electrically connected to the output terminal V+ of the rectifier circuit, and the output terminal VCC-5V of the voltage regulator chip U2 is electrically connected to the main control circuit, the first selection switch and the second selection switch.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] This utility model's lighting module features an AC wide-voltage input load series-parallel switching control circuit. It includes an input voltage sampling circuit, a main control circuit, and a first selector switch and a second selector switch connected in series with the first and second loads, respectively. Both the first and second selector switches are single-pole double-throw relay switches. When the power input port is connected to 220V AC mains, the input voltage sampling circuit inputs the sampled voltage value to the main control circuit. Transistors Q1 and Q2 in the main control circuit are not conducting, and the first and second selector switches are not working. At this time, the first and second selector switches are connected, and the first and second loads are connected in series, allowing the LEDs constituting the first and second loads to operate normally and not be damaged due to excessive voltage. When the power input is connected to the second load, the circuit remains open. When the source input port is connected to 110V AC mains power, the input voltage sampling circuit inputs the sampled voltage value to the main control circuit. Transistors Q1 and Q2 in the main control circuit are turned on, and the first and second selector switches work simultaneously. At this time, the power supply between the first and second selector switches is disconnected, and the first and second loads are connected in parallel. This also ensures that the LEDs that make up the first and second loads work normally and will not fail to light up due to low voltage. In summary, this load series-parallel switching control circuit enables the lighting module to be used with both 220V and 110V AC mains voltages, ensuring that the LEDs in the lighting module can work normally. The circuit structure is simple and practical, and can effectively reduce the production cost of exported lighting products. [Attached Image Description]

[0016] Figure 1 This is the circuit block diagram of the load series-parallel switching control circuit;

[0017] Figure 2 This is the circuit diagram of the load series-parallel switching control circuit in the case of the first load and the second load in series. The dashed line with arrows in the diagram is used to indicate the direction of current flow.

[0018] Figure 3 This is the circuit diagram of the load series-parallel switching control circuit in the state of the first load and the second load in parallel. The dashed line with arrows in the figure is used to indicate the direction of current flow.

[0019] In the diagram: 1 is the power input port; 2 is the rectifier circuit; 3 is the input voltage sampling circuit; 4 is the auxiliary power supply circuit; 5 is the first gating switch; 6 is the second gating switch; 7 is the first load; 8 is the second load; and 9 is the main control circuit.

Detailed Implementation Methods

[0021] The technical features of this utility model will be further described in detail below with reference to the accompanying drawings so that those skilled in the art can understand them.

[0022] The AC wide voltage input load series-parallel switching control circuit of the lighting module, such as... Figures 1-3 As shown, the device includes a power input port 1 for connecting to 220V or 110V AC mains power, a rectifier circuit 2 for converting AC power to DC power, a first load 7 and a second load 8 formed by several LEDs connected in series, a first selector switch 5 and a second selector switch 6 connected in series with the first load 7 and the second load 8 respectively, and a main control circuit 9 for controlling the on / off state of the first selector switch 5 and the second selector switch 6. The rectifier circuit 2 is electrically connected to an auxiliary power supply circuit 4 for supplying power to the main control circuit 9, the first selector switch 5 and the second selector switch 6, and is also electrically connected to an input voltage sampling circuit 3 for detecting and feeding back the input voltage of the power input port 1. The input voltage sampling circuit 3 is electrically connected to the main control circuit 9.

[0023] Specifically, such as Figure 2 or Figure 3 As shown, the first selector switch 5 is a relay K1, and the second selector switch 6 is a relay K2. Both the first selector switch 5 and the second selector switch 6 are single-pole double-throw relay switches, which facilitates the series-parallel switching between the first load 7 and the second load 8. Moreover, the relay switches have strong stability, which can enhance the service life of the circuit.

[0024] Specifically, the first selector switch 5 and the second selector switch 6 operate simultaneously under the control of the main control circuit 9. Pin 4 of the first selector switch 5 is electrically connected to pin 4 of the second selector switch 6, ensuring that the load series-parallel switching control circuit can effectively control the series-parallel switching between the first load 7 and the second load 8. Figure 2 or Figure 3 As shown; when the first selector switch 5 and the second selector switch 6 are not working, pin 4 of relays K1 and K2 is connected, as... Figure 2 As shown, at this time, the first load 7 and the second load 8 are connected in series; when the first selector switch 5 and the second selector switch 6 are working, pin 3 of relays K1 and K2 is turned on, as shown. Figure 3 As shown, at this time, the first load 7 and the second load 8 are connected in parallel.

[0025] In addition, the main control circuit 9 includes a microcontroller chip U1, a transistor Q1 and a transistor Q2, and the input voltage sampling circuit 3 includes a resistor R31 and a resistor R32. The resistors R31 and R32 are connected in series and then connected in parallel with the output terminal of the rectifier circuit 2. The connection terminals of the resistors R31 and R32 are electrically connected to the microcontroller chip U1. The I / O pins of the microcontroller chip U1 are connected in series with resistors R12 and R22 and then electrically connected to the bases of transistors Q1 and Q2. The emitters of transistors Q1 and Q2 are grounded, and the collectors are electrically connected to relays K1 and K2, respectively.

[0026] The load series-parallel switching control circuit uses an input voltage sampling circuit 3 composed of resistors R31 and R32 connected in series to sample the voltage across capacitor CE1 in the rectifier circuit 2 after rectification and filtering, and sends the sampling result to the microcontroller chip U1 in the main control circuit 9. The main control circuit 9 then determines whether the voltage input to the power input port 1 is 220V or 110V.

[0027] When the input voltage is detected to be 220V, the microcontroller chip U1 in the main control circuit 9 sends low-level signals to the base of transistor Q1 and the base of transistor Q2 through resistors R12 and R22 respectively. Transistors Q1 and Q2 are turned off, relays K1 and K2 are not energized, and the first load 7 and the second load 8 are connected in series to adapt to the 220V voltage.

[0028] When the input voltage is detected to be 110V, the microcontroller chip U1 in the main control circuit 9 sends high-level signals to the base of transistor Q1 and the base of transistor Q2 through resistors R12 and R22 respectively. Transistors Q1 and Q2 are turned on, and relays K1 and K2 are simultaneously energized. The first load 7 and the second load 8 are connected in parallel to adapt to the 110V voltage.

[0029] Specifically, the auxiliary power supply circuit 4 includes a step-down chip U3 and a voltage regulator chip U2. The step-down chip U3 is electrically connected to the output terminal V+ of the rectifier circuit 2, and the output terminal VCC-5V of the voltage regulator chip U2 is electrically connected to the main control circuit 9, the first selection switch 5, and the second selection switch 6. The auxiliary power supply circuit 4 can convert the high-voltage DC power output from the rectifier circuit 2 into a low-voltage DC power supply, thereby powering the microcontroller chip U1, relay K1, and relay K2, enabling the circuit to operate normally.

[0030] The embodiments described herein are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the invention. Any modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A load series-parallel switching control circuit for a lighting module with wide AC voltage input, characterized in that: It includes a power input port (1) for connecting to 220V or 110V AC mains power, a rectifier circuit (2) for converting AC power to DC power, a first load (7) and a second load (8) formed by several LEDs connected in series, a first selector switch (5) and a second selector switch (6) connected in series with the first load (7) and the second load (8) respectively, and a main control circuit (9) for controlling the on and off of the first selector switch (5) and the second selector switch (6). The rectifier circuit (2) is electrically connected to an auxiliary power supply circuit (4) for supplying power to the main control circuit (9), the first selector switch (5) and the second selector switch (6), and is also electrically connected to an input voltage sampling circuit (3) for detecting and feeding back the input voltage of the power input port (1). The input voltage sampling circuit (3) is electrically connected to the main control circuit (9).

2. The AC wide voltage input load series-parallel switching control circuit for the lighting module according to claim 1, characterized in that: The first selector switch (5) is a relay K1, and the second selector switch (6) is a relay K2. Both the first selector switch (5) and the second selector switch (6) are single-pole double-throw relay switches.

3. The AC wide voltage input load series-parallel switching control circuit for the lighting module according to claim 2, characterized in that: The first selector switch (5) and the second selector switch (6) work simultaneously under the control of the main control circuit (9). When the first selector switch (5) and the second selector switch (6) are not working, the pins 4 of relays K1 and K2 are connected. When the first selector switch (5) and the second selector switch (6) are working, the pins 3 of relays K1 and K2 are connected. The pins 4 of the first selector switch (5) and the pins 4 of the second selector switch (6) are electrically connected.

4. The AC wide voltage input load series-parallel switching control circuit for the lighting module according to claim 2, characterized in that: The main control circuit (9) includes a microcontroller chip U1, a transistor Q1 and a transistor Q2. The input voltage sampling circuit (3) includes a resistor R31 and a resistor R32. The resistors R31 and R32 are connected in series and then connected in parallel with the output terminal of the rectifier circuit (2). The connection terminals of the resistors R31 and R32 are electrically connected to the microcontroller chip U1. The I / O pins of the microcontroller chip U1 are connected in series with resistors R12 and R22 and then electrically connected to the bases of transistors Q1 and Q2. The emitters of transistors Q1 and Q2 are grounded, and the collectors are electrically connected to relays K1 and K2, respectively.

5. The AC wide voltage input load series-parallel switching control circuit for the lighting module according to any one of claims 1 to 4, characterized in that: The auxiliary power supply circuit (4) includes a step-down chip U3 and a voltage regulator chip U2. The step-down chip U3 is electrically connected to the output terminal V+ of the rectifier circuit (2), and the output terminal VCC-5V of the voltage regulator chip U2 is electrically connected to the main control circuit (9), the first selector switch (5), and the second selector switch (6).

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