Output adaptive power supply circuit

Abstract

The invention belongs to the technical field of lamp power supplies, and particularly relates to an output self-adaptive power supply circuit. A mains supply is connected to the input end of the switching power supply circuit, the switching power supply circuit outputs 12V voltage to be connected to the load LED lamp strip after rectification and voltage transformation processing, a sampling circuit is further connected between the switching power supply circuit and the load LED lamp strip, detection signals of the sampling circuit are output to the self-adaptive control circuit, and after whether current exists or not is judged, the self-adaptive control circuit is switched on. And the self-adaptive control circuit is matched with the feedback circuit to control the switching of the output voltage of the switching power supply circuit. Through the cooperation of the built-in detection circuit and the control circuit, the power supply can automatically adjust the output voltage of the power supply so as to meet the power demands of different LED loads, and the adaptability is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of lamp power supplies, and in particular relates to an output adaptive power supply circuit. Background Art

[0002] With the rapid development of the LED lighting industry, LEDs are now installed in every household and outdoor lighting, which has also led to a booming LED power supply market and increasingly higher requirements for LED power supplies. LED power supplies are devices that convert AC power into DC power through a rectifier.

[0003] The output voltage of a traditional LED power supply is relatively simple and can only meet the needs of the corresponding LED load. The output voltage of the LED power supply cannot change according to the changes of the connected LED load. Therefore, an output adaptive power supply circuit is provided. Summary of the Invention

[0004] In order to solve the defects and shortcomings of the prior art, the purpose of the present invention is to provide an output adaptive power supply circuit with a simple structure, reasonable design and easy use. It can automatically adjust the output voltage of the power supply to meet the power requirements of different LED loads through the cooperation of the built-in detection circuit and control circuit, and has strong adaptability.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: it includes a switching power supply circuit, a sampling circuit, a load LED light strip, an adaptive control circuit, and a feedback circuit; the mains power is connected to the input end of the switching power supply circuit, and the switching power supply circuit outputs a 12V voltage after rectification and voltage transformation and is connected to the load LED light strip. A sampling circuit is also connected between the switching power supply circuit and the load LED light strip. The detection signal of the sampling circuit is output to the adaptive control circuit. After determining whether there is current, the adaptive control circuit and the feedback circuit cooperate to control the switching of the output voltage of the switching power supply circuit.

[0006] Preferably, the sampling circuit includes an output current sampling circuit, an output voltage sampling circuit, and a power supply circuit; the output current sampling circuit, the output voltage sampling circuit, the feedback circuit, and the adaptive control circuit cooperate with each other to regulate the switching power supply circuit.

[0007] Preferably, the power supply circuit provides low-voltage power supply to the chip module and the feedback circuit in the adaptive control circuit.

[0008] Preferably, the output end of the switching power supply circuit outputs a voltage of 12V / 24V under the action of the adaptive control circuit.

[0009] Preferably, the adaptive control circuit and the feedback circuit perform signal interaction via a photoelectric coupler.

[0010] After adopting the above structure, the beneficial effect of the present invention is: it collects the presence or absence of resistance current in the sampling circuit through the cooperation of the built-in detection circuit and the control circuit, thereby judging the size of the load, and automatically adjusting the power supply output voltage to meet the power requirements of different LED loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is described in detail through the following specific implementations and drawings.

[0012] Figure 1 is an electrical block diagram of the present invention; Figure 2 A circuit diagram of the present invention; Explanation of the accompanying symbols: switching power supply circuit 1, sampling circuit 2, load LED light strip 3, adaptive control circuit 4, feedback circuit 5, output current sampling circuit 21, output voltage sampling circuit 22, power supply circuit 23. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0014] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, the accompanying drawings only show structures and / or processing steps closely related to the solutions according to the present invention, while other details that are not closely related to the present invention are omitted.

[0015] See Figure 1 、 Figure 2 As shown, this specific embodiment adopts the following technical solution: it includes a switching power supply circuit 1, a sampling circuit 2, a load LED light strip 3, an adaptive control circuit 4, and a feedback circuit 5; the mains power is connected to the input end of the switching power supply circuit 1, and the switching power supply circuit 1 outputs a 12V voltage after rectification and voltage transformation and is connected to the load LED light strip 3. A sampling circuit 2 is also connected between the switching power supply circuit 1 and the load LED light strip 3. The detection signal of the sampling circuit 2 is output to the adaptive control circuit 4. After determining whether there is current, the adaptive control circuit 4 and the feedback circuit 5 cooperate to control the switching of the output voltage of the switching power supply circuit 1.

[0016] Among them, the sampling circuit 2 includes an output current sampling circuit 21, an output voltage sampling circuit 22, and a power supply circuit 23; the output current sampling circuit 21, the output voltage sampling circuit 22 cooperates with the feedback circuit 5 and the adaptive control circuit 4 to regulate the switching power supply circuit 1.

[0017] In addition, the power supply circuit 23 provides low-voltage power supply to the chip module and feedback circuit 5 in the adaptive control circuit 4; the output end of the switching power supply circuit 1 outputs a 12V / 24V voltage under the action of the adaptive control circuit 4; the output 12V / 24V voltage is not limited to a specific voltage and number of gears, and includes switching of other voltages or more output voltages.

[0018] The adaptive control circuit 4 and the feedback circuit 5 perform signal interaction via a photoelectric coupler.

[0019] After adopting the above structure, the beneficial effect of the present invention is: it collects the presence or absence of resistance current in the sampling circuit through the cooperation of the built-in detection circuit and the control circuit, thereby judging the size of the load, and automatically adjusting the power supply output voltage to meet the power requirements of different LED loads.

[0020] The working principle of this specific embodiment is as follows: When the AC input is powered on, the output voltage VOUT of the switching power supply first defaults to 12V. After the output end is connected to a 12V or 24V LED light strip load, the control circuit (the third pin of the microcontroller) determines whether there is current flowing by detecting the voltage across the sampling resistor (Vcs). If a 12V light strip is connected, the voltage is sufficient to turn on the light strip, and current will flow through the detection resistor, and the detected Vcs voltage will reach 2.2mV; the control circuit will determine that a 12V light strip is connected and stabilize the output at 12V. If a 24V light strip is connected, the voltage is not enough to turn on the light strip, and no current will flow through the detection resistor, and the detected Vcs voltage will be 0. The system will determine that a 24V light strip is connected, then increase the internal feedback voltage reference and switch the output to 24V.

[0021] 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 embodied 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 illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0022] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An output adaptive power supply circuit, characterized in that: It includes a switching power supply circuit, a sampling circuit, a load LED light strip, an adaptive control circuit, and a feedback circuit; the mains power is connected to the input end of the switching power supply circuit, and the switching power supply circuit outputs a 12V voltage after rectification and voltage transformation and is connected to the load LED light strip. A sampling circuit is also connected between the switching power supply circuit and the load LED light strip. The detection signal of the sampling circuit is output to the adaptive control circuit. After determining whether there is current, the adaptive control circuit and the feedback circuit cooperate to control the switching of the output voltage of the switching power supply circuit.

2. The output adaptive power supply circuit according to claim 1, characterized in that: The sampling circuit includes an output current sampling circuit, an output voltage sampling circuit, and a power supply circuit; the output current sampling circuit, the output voltage sampling circuit, the feedback circuit, and the adaptive control circuit cooperate with each other to regulate the switching power supply circuit.

3. The output adaptive power supply circuit according to claim 2, characterized in that: The power supply circuit provides low-voltage power supply to the chip module and the feedback circuit in the adaptive control circuit.

4. The output adaptive power supply circuit according to claim 1, wherein: The output end of the switching power supply circuit outputs a voltage of 12V / 24V under the action of the adaptive control circuit.

5. The output adaptive power supply circuit according to claim 1, characterized in that: The adaptive control circuit and the feedback circuit perform signal interaction via a photoelectric coupler.

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