Output adaptive power supply circuit

Abstract

The utility model 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 utility model belongs to the technical field of lamp power supply, especially a kind of output adaptive power supply circuit. BACKGROUND

[0002] With the rapid development of LED lighting industry, now each family and outdoor lighting are equipped with LED, also make LED power supply market flourish, and the requirement of LED power supply is higher and higher.LED power supply is the device that AC is changed into DC by rectifier.

[0003] The output voltage of traditional LED power supply is relatively single, can only meet the corresponding LED load use, and the output voltage of LED power supply cannot change according to the change of access LED load, so an output adaptive power supply circuit is provided. UTILITY MODEL CONTENT

[0004] To solve the defects and insufficient problems of prior art;The utility model aims at providing an output adaptive power supply circuit with simple structure, reasonable design and convenient use, which can automatically adjust power output voltage to meet different LED load power demand by the cooperation of built-in detection circuit and control circuit, and has strong adaptability.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that it contains switching power supply circuit, sampling circuit, load LED lamp strip, adaptive control circuit, feedback circuit;Mains access the input end of switching power supply circuit, and the voltage of 12V output by switching power supply circuit after rectification and voltage conversion is accessed load LED lamp strip, sampling circuit is also connected between switching power supply circuit and load LED lamp strip, and the detection signal of sampling circuit is output to adaptive control circuit, after determining whether there is current, adaptive control circuit and feedback circuit cooperate to control the switching of output voltage of switching power supply circuit.

[0006] As preferred, the sampling circuit contains output current sampling circuit, output voltage sampling circuit and power supply circuit;Output current sampling circuit, output voltage sampling circuit and feedback circuit, adaptive control circuit cooperate with each other to regulate and control switching power supply circuit.

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

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

[0009] As preferred, the adaptive control circuit and feedback circuit interact signals through photoelectric coupler.

[0010] With the above structure, the utility model has the beneficial effects that: it collects the resistance current in the sampling circuit through the cooperation of the built-in detection circuit and the control circuit, judges the size of the load, and automatically adjusts the power output voltage to meet the different LED load power demand. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model or the prior art, the present utility model is described in detail by the following specific implementation and drawings.

[0012] Figure 1 It is an electrical block diagram of the present utility model;

[0013] Figure 2 It is a circuit diagram of the present utility model;

[0014] The reference signs are explained: switching power supply circuit 1, sampling circuit 2, load LED lamp 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

[0015] In order to make the purpose, technical scheme and advantages of the present utility model more clear and obvious, the present utility model is described by the specific embodiments shown in the drawings below. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the present utility model.

[0016] Here, it also needs to be explained that, in order to avoid the present utility model being obscured by unnecessary details, only the structures and / or processing steps closely related to the scheme according to the present utility model are shown in the drawings, and other details not closely related to the present utility model are omitted.

[0017] Referring to Figure 1 , Figure 2 The present specific implementation adopts the following technical scheme: it contains switching power supply circuit 1, sampling circuit 2, load LED lamp strip 3, adaptive control circuit 4, feedback circuit 5; the input end of the switching power supply circuit 1 is connected to the mains, and the voltage of 12V output by the switching power supply circuit 1 after rectification and voltage conversion is connected to the load LED lamp strip 3, the sampling circuit 2 is also connected between the switching power supply circuit 1 and the load LED lamp 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 cooperates with the feedback circuit 5 to control the switching of the output voltage of the switching power supply circuit 1.

[0018] The sampling circuit 2 comprises an output current sampling circuit 21, an output voltage sampling circuit 22 and a power supply circuit 23.

[0019] In addition, the power supply circuit 23 supplies low voltage to the chip module in the adaptive control circuit 4 and the feedback circuit 5; the output end of the switching power supply circuit 1 outputs 12V / 24V voltage under the action of the adaptive control circuit 4; the output 12V / 24V voltage is not limited to specific voltage and gear number, and includes other voltage or more gear output voltage switching.

[0020] The adaptive control circuit 4 and the feedback circuit 5 interact with each other through an optoelectronic coupler.

[0021] After the above structure is adopted, the beneficial effects of the utility model are that: it collects the presence or absence of the 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 thereby automatically adjusting the power output voltage to meet different LED load power requirements.

[0022] The working principle of the embodiment is that when AC input is powered on, the switching power supply output voltage VOUT is first defaulted as 12V, and after the output end is connected to the 12V or 24V LED lamp strip load, the control circuit (the third pin of the single-chip microcomputer) judges whether there is current flowing through by detecting the voltage (Vcs) at both ends of the sampling resistor. If the 12V lamp strip is connected, the voltage is enough to make the lamp strip conductive, the detection resistor has current passing through, and the detected Vcs voltage reaches 2.2mV; the control circuit will judge that the 12V lamp strip is connected, and the output is stably controlled at 12V. If the 24V lamp strip voltage is not enough to make the lamp strip conductive, the detection resistor has no current passing through, and the detected Vcs voltage will be 0. The system will judge that the 24V lamp strip is connected, and then the internal feedback voltage reference is increased, and the output is switched to 24V.

[0023] It is apparent for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments 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 strip, an adaptive control circuit, and a feedback circuit. The mains power is connected to the input terminal of the switching power supply circuit, and the switching power supply circuit outputs a 12V voltage after rectification and transformation, which is then connected to the load LED strip. A sampling circuit is also connected between the switching power supply circuit and the load LED 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 work together 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 work together 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 to the chip module and feedback circuit in the adaptive control circuit.

4. The output adaptive power supply circuit according to claim 1, characterized in that: The output terminal 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 communicate with each other via an optocoupler.

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