LED street lamp power supply circuit

Abstract

The utility model discloses an LED street lamp power supply circuit, which comprises a power pack, a switching circuit, a booster circuit and a voltage stabilizing circuit, the output end of the power pack is connected with the first input end of the switching circuit, the second input end of the switching circuit is used for connecting a control line, and the output end of the switching circuit is connected with the input end of the booster circuit and the input end of the voltage stabilizing circuit; the power pack comprises a solar interface SU < N + >, a battery pack interface BAT < + > and a mains supply interface DC < + >; the boost circuit comprises a boost chip Nd1, a fourth pin and a fifth pin of the boost chip Nd1 are connected with the output end of the switching circuit through a resistor R2, a first pin of the boost chip Nd1 is connected with a resistor R3, and the resistor R3 outputs high voltage Vdd12V; the voltage stabilizing circuit comprises a voltage stabilizing chip U1, a second pin and a fourth pin of the voltage stabilizing chip U1 are connected with the output end of the switching circuit, and a third pin of the voltage stabilizing chip U1 outputs low voltage of 3.3 V. An external switch line and an MOS tube are used as a switch, solar energy, a battery and a mains supply can be used for power supply at the same time, 12V and 3.3 V voltages can be output for power supply, and the stability is good.

Description

Technical Field

[0001] The utility model relates to an LED street lamp, in particular to a power supply circuit for an LED street lamp. Background Art

[0002] During the renovation of old LED street lights, the power supply systems of some LEDs were damaged and could not provide 12V and 3.3V, so the power supply systems needed to be replaced urgently. In addition, street lights were previously powered by solar energy or batteries, which could not provide lighting functions on rainy days or when the batteries were out of power, increasing the danger to pedestrians. Utility Model Content

[0003] In order to solve the defects of the above-mentioned prior art, the utility model provides an LED street lamp power supply circuit. The utility model uses an external switch line and a MOS tube as a switch, can simultaneously use solar energy, batteries, and AC power for power supply, can output 12V and 3.3V voltages for power supply, and has good stability.

[0004] To achieve the above technical objectives, the present invention adopts the following technical solutions: an LED street lamp power supply circuit, comprising a power supply group, a switching circuit, a boost circuit and a voltage stabilizing circuit, wherein the output end of the power supply group is connected to the first input end of the switching circuit, the second input end of the switching circuit is used to connect to a control line, and the output end of the switching circuit is connected to the input end of the boost circuit and the input end of the voltage stabilizing circuit;

[0005] The power supply group includes a solar interface SUN+, a battery interface BAT+, and a mains interface DC+. One path of the mains interface DC+ is connected to a resistor R1, which is connected to a diode D2. Another path of the mains interface DC+ is connected to a capacitor C9, which is connected to the negative electrode of the battery. The solar interface SUN+ is connected to a diode D1, and the battery interface BAT+ is connected to a diode D5. The diode D2, the diode D1, and the diode D5 are connected together to the first input end of the switching circuit.

[0006] The boost circuit includes a boost chip Nd1, pins 4 and 5 of the boost chip Nd1 are connected to a resistor R2, the resistor R2 is connected to the output end of the switch circuit, and pin 1 of the boost chip Nd1 is connected to a resistor R3, which outputs a high voltage Vdd12V;

[0007] The voltage stabilizing circuit includes a voltage stabilizing chip U1 , pins 2 and 4 of the voltage stabilizing chip U1 are connected to the output end of the switch circuit, and pin 3 of the voltage stabilizing chip U1 outputs a low voltage of 3.3V.

[0008] The boost circuit also includes an inductor Ld1, an inductor Ldx1, a diode Dx1, and a diode D4. The inductor Ld1 and the inductor Ldx1 are connected in parallel between pins 1 and 5 of the boost chip Nd1; the diode D4 is connected to pin 1 of the boost chip Nd1, the diode Dx1 is connected in parallel across the diode D4, and the diode D4 is connected to the resistor R3.

[0009] Pin 3 of the boost chip Nd1 is connected to resistor Rdz1, resistor Rdz2, and capacitor Cdz1. Resistor Rdz1 and capacitor Cdz1 are connected in parallel to resistor R3. One end of resistor Rdz2 is connected to the negative electrode of the battery and the other end is connected to pin 3. It also includes capacitors Cd2 and Cd4. One end of capacitors Cd2 and Cd4 are connected in parallel to resistor R3 and the other end is connected to the negative electrode of the battery.

[0010] The voltage stabilizing circuit also includes a resistor R5, a capacitor C5, a capacitor C10, a capacitor C11, and a capacitor C6. The resistor R5, the capacitor C5, and the capacitor C10 are all connected to pin 2 of the voltage stabilizing chip U1. The resistor R5 is connected to the out12V power supply. The capacitor C10 is grounded. One end of the capacitor C11 is grounded and the other end is connected to pin 3 of the voltage stabilizing chip U1. One end of the capacitor C6 is grounded and the other end is connected to pin 3 of the voltage stabilizing chip U1.

[0011] The switch circuit includes a MOS transistor QP1, a resistor RK1, and a resistor RK2. The gate of the MOS transistor QP1 serves as a first input terminal, the source is connected to the resistor RK2, the resistor RK2 is connected to the control line interface SW, the control line interface SW serves as a second input terminal, the resistor RK1 is connected between the gate and the source, and the drain serves as an output terminal.

[0012] In summary, the present invention has achieved the following technical effects:

[0013] The utility model uses an external switch line and an internal MOS tube as a switch. When the external switch line is connected, the MOS tube is turned on and a 3.3V voltage is output through the voltage regulator chip. It can be powered by solar energy, batteries, and AC power. It has good stability and strong versatility and is suitable for the renovation of old LED street lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the circuit principle provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0015] The present invention will be described in further detail below with reference to the accompanying drawings.

[0016] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0019] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0020] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0021] Example:

[0022] like Figure 1 As shown, a power supply circuit for an LED street lamp includes a power supply group, a switching circuit, a boost circuit and a voltage stabilizing circuit. The output end of the power supply group is connected to the first input end of the switching circuit, the second input end of the switching circuit is used to connect to a control line, and the output end of the switching circuit is connected to the input end of the boost circuit and the input end of the voltage stabilizing circuit.

[0023] The boost circuit includes a boost chip Nd1, pins 4 and 5 of the boost chip Nd1 are connected to a resistor R2, the resistor R2 is connected to the output end of the switch circuit, and pin 1 of the boost chip Nd1 is connected to a resistor R3, which outputs a high voltage Vdd12V;

[0024] The voltage stabilizing circuit includes a voltage stabilizing chip U1 , pins 2 and 4 of the voltage stabilizing chip U1 are connected to the output end of the switch circuit, and pin 3 of the voltage stabilizing chip U1 outputs a low voltage of 3.3V.

[0025] The utility model utilizes a switch circuit to connect the boost circuit and the power supply group, the voltage stabilizing circuit and the power supply group, utilizes the boost circuit to output a high voltage Vdd12V, and utilizes the voltage stabilizing circuit to output a low voltage 3.3V.

[0026] Specifically, the boost circuit also includes an inductor Ld1, an inductor Ldx1, a diode Dx1, and a diode D4. The inductor Ld1 and the inductor Ldx1 are connected in parallel between pins 1 and 5 of the boost chip Nd1; the diode D4 is connected to pin 1 of the boost chip Nd1, the diode Dx1 is connected in parallel across the diode D4, and the diode D4 is connected to the resistor R3.

[0027] Pin 3 of the boost chip Nd1 is connected to resistor Rdz1, resistor Rdz2, and capacitor Cdz1. Resistor Rdz1 and capacitor Cdz1 are connected in parallel to the out12V power supply, and resistor Rdz2 is connected to the negative electrode of the battery. It also includes capacitors Cd2 and Cd4. One end of the capacitors Cd2 and Cd4 connected in parallel is connected to resistor R3, and the other end is connected to the negative electrode of the battery.

[0028] Pin 5 of the boost chip Nd1 is also connected to capacitors Cd3 and Cd1. Capacitor Cd3 is grounded, and capacitor Cd1 is grounded for filtering the power supply signal.

[0029] Resistor R3 is a current limiting resistor. Resistors Rdz1 and Rdz2 configure the out12V power supply. The boost circuit boosts the power signal to Vdd12V to power other circuits of the LED street light that require 12V.

[0030] The voltage-stabilizing circuit also includes resistor R5, capacitors C5, C10, C11, and C6. Resistors R5, C5, and C10 are all connected to pin 2 of the voltage-stabilizing chip U1. Resistor R5 is connected to the out12V power supply. Capacitor C10 is grounded. Capacitor C11 is grounded at one end and connected to pin 3 of the voltage-stabilizing chip U1. Capacitor C6 is grounded at one end and connected to pin 3 of the voltage-stabilizing chip U1. The voltage-stabilizing circuit stabilizes the voltage at 3.3V to power other circuits in the LED streetlight that require 3.3V.

[0031] The switching circuit includes a MOS transistor QP1, a resistor RK1, and a resistor RK2. The gate of the MOS transistor QP1 serves as a first input terminal and is connected to the negative electrodes of D1, D5, and D2. The source is connected to the resistor RK2. The resistor RK2 is connected to the control line interface SW. The control line interface SW serves as a second input terminal. The resistor RK1 is connected between the gate and the source, and the drain serves as an output terminal.

[0032] Resistor R5 is a current limiting resistor, capacitors C5, C10, C11, and C6 are filter capacitors, and D1 and D5 prevent reverse current.

[0033] MOS tube QP1 is a switch, and together with RK1 and RK2, it controls the power supply of the entire device through an external switch line. The voltage is boosted by Nd1 and inductor LD1, and diode D4 prevents reverse voltage from discharging to the ground. When the external switch line is connected, the output voltage of QP1 outputs a stable 3.3V voltage through U1 to drive the microcontroller.

[0034] The inductor Ld1 uses 6.8uH / SWPA015S6R8MT, the inductor Ldx1 uses 10uH / SWPA4030S10RMT, the boost chip Nd1 uses HM1548B / SOT23-6, the MOS tube QP1 uses AO3401 / SOT-23, and the voltage regulator chip U1 uses LP3993-28X3F / SOT89.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A power supply circuit for LED street lamps, characterized in that: The device comprises a power supply group, a switching circuit, a boost circuit and a voltage stabilizing circuit, wherein the output end of the power supply group is connected to the first input end of the switching circuit, the second input end of the switching circuit is used to connect to a control line, and the output end of the switching circuit is connected to the input end of the boost circuit and the input end of the voltage stabilizing circuit; The power supply group includes a solar interface SUN+, a battery interface BAT+, and a mains interface DC+. One path of the mains interface DC+ is connected to a resistor R1, which is connected to a diode D2. Another path of the mains interface DC+ is connected to a capacitor C9, which is connected to the negative electrode of the battery. The solar interface SUN+ is connected to a diode D1, and the battery interface BAT+ is connected to a diode D5. The diode D2, the diode D1, and the diode D5 are connected together to the first input end of the switching circuit. The boost circuit includes a boost chip Nd1, pins 4 and 5 of the boost chip Nd1 are connected to a resistor R2, the resistor R2 is connected to the output end of the switch circuit, and pin 1 of the boost chip Nd1 is connected to a resistor R3, which outputs a high voltage Vdd12V; The voltage stabilizing circuit includes a voltage stabilizing chip U1 , pins 2 and 4 of the voltage stabilizing chip U1 are connected to the output end of the switch circuit, and pin 3 of the voltage stabilizing chip U1 outputs a low voltage of 3.3V.

2. The LED street lamp power supply circuit according to claim 1, characterized in that: The boost circuit also includes an inductor Ld1, an inductor Ldx1, a diode Dx1, and a diode D4. The inductor Ld1 and the inductor Ldx1 are connected in parallel between pins 1 and 5 of the boost chip Nd1; the diode D4 is connected to pin 1 of the boost chip Nd1, the diode Dx1 is connected in parallel across the diode D4, and the diode D4 is connected to the resistor R3.

3. The LED street lamp power supply circuit according to claim 1, characterized in that: Pin 3 of the boost chip Nd1 is connected to resistor Rdz1, resistor Rdz2, and capacitor Cdz1. Resistor Rdz1 and capacitor Cdz1 are connected in parallel to resistor R3. One end of resistor Rdz2 is connected to the negative electrode of the battery and the other end is connected to pin 3. It also includes capacitors Cd2 and Cd4. One end of capacitors Cd2 and Cd4 are connected in parallel to resistor R3 and the other end is connected to the negative electrode of the battery.

4. The LED street lamp power supply circuit according to claim 1, characterized in that: The voltage stabilizing circuit also includes a resistor R5, a capacitor C5, a capacitor C10, a capacitor C11, and a capacitor C6. The resistor R5, the capacitor C5, and the capacitor C10 are all connected to pin 2 of the voltage stabilizing chip U1. The resistor R5 is connected to the out12V power supply. The capacitor C10 is grounded. One end of the capacitor C11 is grounded and the other end is connected to pin 3 of the voltage stabilizing chip U1. One end of the capacitor C6 is grounded and the other end is connected to pin 3 of the voltage stabilizing chip U1.

5. The LED street lamp power supply circuit according to claim 1, characterized in that: The switch circuit includes a MOS transistor QP1, a resistor RK1, and a resistor RK2. The gate of the MOS transistor QP1 serves as a first input terminal, the source is connected to the resistor RK2, the resistor RK2 is connected to the control line interface SW, the control line interface SW serves as a second input terminal, the resistor RK1 is connected between the gate and the source, and the drain serves as an output terminal.

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