Power supply device capable of changing constant-voltage power supply output and lamp

Abstract

The utility model provides a power supply device capable of changing constant voltage power supply output and a lamp. The power supply device comprises an AD sampling circuit, a constant voltage circuit and an LED load circuit. The input end of the AD sampling circuit is connected with the VDD-EN; the input end of the constant-voltage circuit is connected with a direct-current power supply, and the output end of the constant-voltage circuit is connected with the output end of the AD sampling circuit; the output end of the constant voltage circuit is also connected with the LED load circuit; the AD sampling circuit comprises a triode, a first resistor, a second resistor and a fifth resistor; when the power supply device needs to output different voltages, adaptation can be performed by adjusting the resistance values of the second resistor, the third resistor and the fifth resistor, so that the application range of the power supply device is wide, and meanwhile, the cost can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED lamp power supply, and in particular relates to a power supply device and a lamp capable of changing the output of a constant voltage power supply. Background Art

[0002] In the LED brightness control circuit of the existing technology for constant voltage power supply, the output voltage is usually controlled at the constant voltage power supply end. After the configuration of various components is completed, the output voltage of the circuit is fixed. Therefore, when the load LED needs to change the brightness, the brightness of the load LED can only be adjusted by PWM through a triode or MOS tube; this method requires more external peripheral circuits and a high-configuration single-chip microcomputer. When the constant voltage circuit is connected to multiple LED loads, the cost is greatly increased. Therefore, controlling the output voltage at the constant voltage power supply end can make the circuit simpler and lower the cost. Utility Model Content

[0003] In order to overcome the above technical defects, the utility model provides a power supply device and a lamp capable of changing the output of a constant voltage power supply, which can reduce the cost of changing the output voltage of the constant voltage power supply.

[0004] The utility model is realized by the following scheme:

[0005] A power supply device capable of changing the output of a constant voltage power supply, comprising: an AD sampling circuit, a constant voltage circuit, and an LED load circuit;

[0006] The input end of the AD sampling circuit is connected to the IO port of the single chip microcomputer;

[0007] The input end of the constant voltage circuit is connected to a DC power supply, and the output end is connected to the output end of the AD sampling circuit;

[0008] The output end of the constant voltage circuit is also connected to the LED load circuit.

[0009] As a further improvement of the utility model, the AD sampling circuit includes: a triode, a first resistor, a second resistor and a fifth resistor;

[0010] The collector of the transistor is connected to the constant voltage circuit through the second resistor, and the collector of the transistor is grounded through the second resistor and the third resistor;

[0011] The base of the transistor is connected to the IO port of the single chip computer through a first resistor;

[0012] The emitter of the triode is grounded;

[0013] The constant voltage circuit comprises: a constant voltage chip, a fourth resistor, a first polarity capacitor, a second polarity capacitor, a capacitor, an inductor, and a diode;

[0014] The second pin of the constant voltage chip is grounded;

[0015] The third pin of the constant voltage chip is connected to the LED load circuit through the fifth resistor, the third pin of the constant voltage chip is grounded through the fifth resistor and the second polarity capacitor, and the third pin of the constant voltage chip is connected to the sixth pin of the constant voltage chip through the fifth resistor and the inductor;

[0016] The fourth pin of the constant voltage chip is connected to a DC power supply through the fourth resistor;

[0017] The fifth pin of the constant voltage chip is connected to a DC power supply, the fifth pin of the constant voltage chip is grounded through the first polarity capacitor, and the fifth pin of the constant voltage chip is grounded through the capacitor.

[0018] As a further improvement of the utility model, the LED load circuit comprises: a sixth resistor and a light emitting diode;

[0019] The third pin of the constant voltage chip is grounded through the fifth resistor, the sixth resistor, and the light emitting diode.

[0020] In addition, the utility model also provides an LED lamp, comprising the above-mentioned power supply device, characterized in that the LED load circuit is connected to the LED load.

[0021] Compared with the prior art, the beneficial effects of the utility model are as follows: the sampling circuit is arranged by the second resistor, the third resistor, and the fifth resistor. When the power supply device needs to output different voltages, the resistance values ​​of the second resistor, the third resistor, and the fifth resistor can be adjusted to adapt, so that the power supply device has a wide range of applications and can make corresponding adjustments to the output voltage according to the application scenario and load, thereby ensuring that the brightness control of the LED is achieved at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 It is a schematic diagram of the overall structure of the power supply device of the utility model.

[0024] Figure numerals: 1, AD sampling circuit; 2, constant voltage circuit; 3, LED load circuit. DETAILED DESCRIPTION

[0025] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0026] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0027] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] Example 1

[0029] This embodiment provides a power supply device capable of changing the output of a constant voltage power supply, such as Figure 1 As shown, it includes: an AD sampling circuit 1, a constant voltage circuit 2, and an LED load circuit 3; the input end of the AD sampling circuit 1 is connected to the IO port VDD-EN of the microcontroller; the input end of the constant voltage circuit 2 is connected to a DC power supply, and the output end is connected to the output end of the AD sampling circuit 1; the output end of the constant voltage circuit 2 is also connected to the LED load circuit 3.

[0030] The AD sampling circuit 1 includes: a transistor Q1, a first resistor R1, a second resistor R2 and a fifth resistor R5; the collector of the transistor Q1 is connected to the constant voltage circuit 2 through the second resistor R2, and the collector of the transistor Q1 is grounded through the second resistor R2 and the third resistor R3; the base of the transistor Q1 is connected to the IO port VDD-EN of the single-chip computer through the first resistor R1; and the emitter of the transistor Q1 is grounded.

[0031] Furthermore, the constant voltage circuit 2 includes: a constant voltage chip U1, a fourth resistor R4, a first polarity capacitor EC1, a second polarity capacitor EC2, a capacitor C1, an inductor L1, and a diode D1; the second pin of the constant voltage chip U1 is grounded; the third pin of the constant voltage chip U1 is connected to the LED load circuit through a fifth resistor, the third pin of the constant voltage chip U1 is grounded through a fifth resistor R5 and the second polarity capacitor EC2, and the third pin of the constant voltage chip U1 is connected to the sixth pin of the constant voltage chip U1 through a fifth resistor R5 and the inductor L1; the fourth pin of the constant voltage chip U1 is connected to a DC power supply through a fourth resistor R4; the fifth pin of the constant voltage chip U1 is connected to a DC power supply, the fifth pin of the constant voltage chip U1 is grounded through the first polarity capacitor EC1, and the fifth pin of the constant voltage chip U1 is grounded through the capacitor C1.

[0032] It should be noted that the output voltage of the constant voltage chip U1 must be adjustable. For example, when U1 uses the Otech IC constant voltage IC, its third pin is the FB pin, and the output voltage can be adjusted by adjusting the ratio of the pull-up and pull-down resistors.

[0033] As a further improvement of the present invention, the LED load circuit 3 includes: a sixth resistor R6 and a light emitting diode D1; the third pin of the constant voltage chip U1 is grounded through the fifth resistor R5, the sixth resistor R6 and the light emitting diode D1.

[0034] Next, this embodiment is further explained in conjunction with the specific implementation process, as follows:

[0035] When the DC power supply is input, the constant voltage chip U1 starts to work. When there is no signal on VDD-EN, the third resistor R3 and the fifth resistor R5 divide the voltage and sample it through the third pin of the constant voltage chip U1, and the DC output port outputs the voltage. When there is a signal on VDD-EN, the transistor Q1 is turned on, the second resistor R2 and the third resistor R3 are connected in parallel, and the voltage sampled by the third pin of the constant voltage chip U1 changes, causing the voltage output by the DC output port to change.

[0036] Example: When Q1 is not conducting, the sampling voltage of the third pin of U1 is U fb =R5*U 输出 / R3; Similarly, combining the U1 specification and Kirchhoff's law, U fb At this time, changing R2, R3, R5 can change U fb , thereby achieving the effect of changing the output.

[0037] For other working principles of this embodiment, please refer to the prior art and will not be described in detail here.

[0038] The voltage output by the DC output port of this embodiment has strong applicability. When different voltages need to be output, the voltages can be adapted by adjusting the resistance values ​​of the second resistor R2, the third resistor R3, and the fifth resistor R5. The power supply device of this embodiment has a wide range of applications. The output of the DC output port can be adjusted accordingly according to the application occasion and load, thereby ensuring that the brightness control of the LED is achieved at a low cost.

[0039] Example 2

[0040] This embodiment provides an LED lamp, including the power supply device in Embodiment 1, wherein the DC output port of the LED load circuit is connected to the LED load. For the specific implementation process of this embodiment, please refer to Embodiment 1, which will not be described in detail here.

[0041] It should be noted that the voltage VF that the LED load bears when it is forward-conducting must be smaller than the voltage value output by the DC output port.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A power supply device capable of changing the output of a constant voltage power supply, characterized in that: include: AD sampling circuit, constant voltage circuit, LED load circuit; The input end of the AD sampling circuit is connected to the IO port of the single chip microcomputer; The input end of the constant voltage circuit is connected to a DC power supply, and the output end is connected to the output end of the AD sampling circuit; The output end of the constant voltage circuit is also connected to the LED load circuit; The AD sampling circuit comprises: a triode, a first resistor, a second resistor, a third resistor and a fifth resistor; The collector of the transistor is connected to the constant voltage circuit through the second resistor, and the collector of the transistor is grounded through the second resistor and the third resistor; The collector of the transistor is connected to the LED load circuit through the second resistor and the fifth resistor; The base of the transistor is connected to the IO port of the single chip computer through a first resistor; The emitter of the transistor is grounded.

2. The power supply device according to claim 1, characterized in that: The constant voltage circuit comprises: a constant voltage chip, a fourth resistor, a first polarity capacitor, a second polarity capacitor, a capacitor, an inductor, and a diode; The second pin of the constant voltage chip is grounded; The third pin of the constant voltage chip is connected to the LED load circuit through the fifth resistor, the third pin of the constant voltage chip is grounded through the fifth resistor and the second polarity capacitor, and the third pin of the constant voltage chip is connected to the sixth pin of the constant voltage chip through the fifth resistor and the inductor; The fourth pin of the constant voltage chip is connected to a DC power supply through the fourth resistor; The fifth pin of the constant voltage chip is connected to a DC power supply, the fifth pin of the constant voltage chip is grounded through the first polarity capacitor, and the fifth pin of the constant voltage chip is grounded through the capacitor.

3. The power supply device according to claim 2, characterized in that: The LED load circuit comprises: a sixth resistor and a light emitting diode; The third pin of the constant voltage chip is grounded through the fifth resistor, the sixth resistor, and the light emitting diode.

4. An LED lamp, characterized in that: It comprises the power supply device as described in any one of claims 1 to 3, wherein the LED load circuit is connected to the LED load.

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