CN209744171U - Non-isolated LED driving street lamp - Google Patents

Abstract

The utility model discloses a non-isolation drive LED's street lamp, include: a housing; the PCB aluminum substrate is welded with a plurality of LEDs, the PCB aluminum substrate is directly fixed in the shell through a heat-conducting silica gel pad and is tightly attached to the shell, and heat of the PCB aluminum substrate can be dissipated after being conducted through the shell; the non-isolated driving power supply is fixed in the cavity of the shell, the output end of the non-isolated driving power supply is electrically connected with the LEDs, and the input end of the non-isolated driving power supply is electrically connected with the alternating current power supply; the lamp post sleeve is arranged at the bottom of the shell and can be sleeved on the street lamp fixing rod; a lens mounted at the front of the housing proximate the LED. This patent lies in using non-isolation drive power supply, adopts heat conduction silica gel gasket, adorns to do between aluminium base board of PCB and lamps and lanterns shell insulatedly, and heat conduction silica gel pad has the characteristic of high insulation and high thermal conductivity, fine solution LED lamps and lanterns need radiating problem, solved the requirement that non-isolation power supply needs insulation simultaneously. The utility model has the advantages of simple structure, low cost, small volume and high cost performance.

Description

non-isolated LED driving street lamp

Technical Field

The utility model relates to a non-isolation drive LED's street lamp.

Background

The existing LED driving power supply adopts an isolation driving power supply to drive the LED lamp beads, the isolation driving power supply is complex in design, high in cost, multiple in required components and high in production process requirement, the power supply volume is difficult to be reduced due to the isolation transformer, the novel LED lighting lamp with the characteristics of energy conservation, emission reduction and environmental friendliness is difficult to popularize on a large scale for the market with the lamp cost requirement.

The traditional LED street lamp is driven by an isolated LED, and comprises main components such as an LED lamp bead, a PCB (printed circuit board) aluminum substrate, a radiator, an optical lens, a lamp main body and the like, wherein when seen from the direction of an electric path, a mains supply passes through a driving power supply, the power supply outputs a constant current and is then connected with the LED lamp bead, the LED lamp bead is attached to the PCB aluminum substrate, and the PCB aluminum substrate is then closely attached to the radiator for radiating; however, the cost of the isolated power supply is high, the size is relatively large, and the market demand is difficult to meet in some low-income markets.

SUMMERY OF THE UTILITY MODEL

The utility model discloses it is not enough according to above, provide a drive LED's street lamp is kept apart to non-.

the technical scheme of the utility model is that:

a street lamp for non-isolated driving of LEDs is characterized by comprising:

A housing;

The PCB aluminum substrate is welded with a plurality of LEDs, the PCB aluminum substrate is directly fixed in the shell through a heat-conducting silica gel pad and is tightly attached to the shell, and heat of the PCB aluminum substrate can be dissipated after being conducted through the shell;

The non-isolated driving power supply is fixed in the cavity of the shell, the output end of the non-isolated driving power supply is electrically connected with the LEDs, and the input end of the non-isolated driving power supply is electrically connected with the alternating current power supply;

the lamp post sleeve is arranged at the bottom of the shell and can be sleeved on the street lamp fixing rod;

a lens mounted at the front of the housing proximate the LED.

this patent lies in using non-isolation drive power supply, adopts heat conduction silica gel gasket, adorns to do between aluminium base board of PCB and lamps and lanterns shell insulatedly, and heat conduction silica gel pad has the characteristic of high insulation and high thermal conductivity, fine solution LED lamps and lanterns need radiating problem, solved the requirement that non-isolation power supply needs insulation simultaneously.

the non-isolated drive power supply includes:

one alternating current input end of the bridge stack BG1 is connected with one electrode of an alternating current power supply through a fuse F1, and the other alternating current input end is directly connected with the other electrode of the alternating current power supply;

an electrolytic capacitor CE1 connected in parallel with the two output terminals of the bridge stack BG 1;

The sampling resistor RS, the LED1, the LEDs 2, … … LEDN and the inductance coil L1 are connected in series between the positive output end of the bridge stack BG1 and the drain electrode of the NMOS tube Q1;

a negative input end of the first comparator U1A is connected with the positive electrode of the electrolytic capacitor CE1, and a positive input end thereof is connected with the positive electrode of the LED1 and the common end of the sampling resistor RS;

a negative input end of the second comparator U2A is connected with the output end of the first comparator U1A, a positive input end is connected to the ground through a voltage regulator tube ZV1, and an output end is connected with the grid electrode of an NMOS tube Q1;

an NMOS transistor Q1, the source of which is grounded;

a freewheeling diode D1, the anode of which is connected with the drain of the NMOS tube Q1 and the cathode of which is connected with the anode of the LED 1;

the components are welded on the PCB aluminum substrate.

the shell is made of aluminum.

the utility model discloses the street lamp power adopts the non-isolated drive, has electric simple structure, and lamps and lanterns volume design has more the flexibility, and whole lamps and lanterns volume also can reduce, and this makes the reduce cost that power cost and heat dissipation shell can be by a wide margin, has high price/performance ratio and market competition.

The utility model has the advantages of simple structure, low cost, small volume and high cost performance.

drawings

fig. 1 is a schematic view of the overall structure of the present invention.

fig. 2 is an electrical schematic diagram of the non-isolated driving power supply of the present invention.

Detailed Description

the present invention will now be further described with reference to the accompanying drawings:

as shown, a street lamp for non-isolated driving of LEDs comprises:

a housing 5;

The LED lamp comprises a PCB aluminum substrate 2, a plurality of LEDs are welded on the PCB aluminum substrate 2, the PCB aluminum substrate 2 is directly fixed in a shell 5 through a heat-conducting silica gel pad 3 and is tightly attached to the shell 5, and heat of the PCB aluminum substrate 2 can be dissipated after being conducted through the shell 5;

The non-isolated driving power supply 6 is fixed in the cavity of the shell 5, the output end of the non-isolated driving power supply 6 is electrically connected with the LEDs, and the input end of the non-isolated driving power supply 6 is electrically connected with the alternating current power supply;

the lamp post sleeve 7 is arranged at the bottom of the shell 5, and the lamp post sleeve 7 can be sleeved on the street lamp fixing rod;

A lens 1 mounted at the front of the housing 5 near the LED.

the non-isolated drive power supply 6 includes:

One alternating current input end of the bridge stack BG1 is connected with one electrode of an alternating current power supply through a fuse F1, and the other alternating current input end is directly connected with the other electrode of the alternating current power supply;

an electrolytic capacitor CE1 connected in parallel with the two output terminals of the bridge stack BG 1;

The sampling resistors RS, the LED1, the LEDs 2, … … LEDN and the inductance coil L1 are connected in series between the positive output end of the bridge stack BG1 and the drain electrode of the NMOS tube Q1, and the quantity of the LEDs 1, the LEDs 2 and the LED … … LEDN is matched according to factors such as power and the like;

A negative input end of the first comparator U1A is connected with the positive electrode of the electrolytic capacitor CE1, and a positive input end thereof is connected with the positive electrode of the LED1 and the common end of the sampling resistor RS;

a negative input end of the second comparator U2A is connected with the output end of the first comparator U1A, a positive input end is connected to the ground through a voltage regulator tube ZV1, and an output end is connected with the grid electrode of an NMOS tube Q1;

an NMOS transistor Q1, the source of which is grounded;

A freewheeling diode D1, the anode of which is connected with the drain of the NMOS tube Q1 and the cathode of which is connected with the anode of the LED 1;

The power ends of the first comparator U1A and the second comparator U2A are connected with a power supply, the power supply is 3-36V, and a DC/DC module can be selected, or a resistor is used for reducing voltage and a voltage stabilizing tube is used for stabilizing voltage.

the components are welded on the PCB aluminum substrate 2.

the housing 5 is made of aluminum.

the circuit of the non-isolated driving power supply 6 is of a BUCK topological structure, firstly, commercial power is filtered by a bridge stack BG1 and then is converted into direct current, and CE1 is a rectified filter capacitor; it is known that, LED driving requires a constant current, which is a constant average current, and it can be known from the circuit structure that the average current of the LED load is equal to the average current of the inductor L1, and the average current ILAVG = (ILpk + ILvy)/2 of the inductor L1, that is, the peak current of the inductor plus the peak-valley current of the inductor are divided by 2, so that if the current is required to be constant, only the peak current of the inductor L1 and the peak-valley current of the inductor L1 are controlled, and the setting circuit works in the critical mode, the peak-valley current of the inductor is 0, and then ILED = ILpk/2, so that the peak current of the inductor L1 can be simply controlled to obtain a constant current; RS is a sampling resistor and is connected in series in the main circuit, when the current in the circuit increases, the voltage on the RS also increases, the voltage collected by the operational amplifier is compared with ZV1, when the voltage is higher than a reference voltage ZV1, the switch NMOS tube Q1 is closed, when the voltage is closed, the circuit current is reduced by RS, the voltage is also reduced, when the voltage is lower than the reference voltage ZV1, the switch Q1 is opened, therefore ILPK = ZV1/RS, ILED = ILPK/2, as long as RS is unchanged, the LED current is unchanged, and constant current can be obtained.

Claims (3)

1. a street lamp for non-isolated driving of LEDs is characterized by comprising:

a housing (5);

The LED lamp comprises a PCB aluminum substrate (2), a plurality of LEDs are welded on the PCB aluminum substrate (2), the PCB aluminum substrate (2) is directly fixed in a shell (5) through a heat-conducting silica gel pad (3) and is tightly attached to the shell (5), and heat of the PCB aluminum substrate (2) can be dissipated after being conducted through the shell (5);

The non-isolated driving power supply (6) is fixed in the cavity of the shell (5), the output end of the non-isolated driving power supply (6) is electrically connected with the LEDs, and the input end of the non-isolated driving power supply (6) is electrically connected with the alternating current power supply;

the lamp post sleeve (7) is arranged at the bottom of the shell (5), and the lamp post sleeve (7) can be sleeved on the street lamp fixing rod;

and a lens (1) mounted on the front of the housing (5) near the LED.

2. The street lamp with non-isolated LED driving as claimed in claim 1, wherein the non-isolated LED driving power supply (6) comprises:

the bridge stack BG1 is characterized in that one alternating current input end of the bridge stack BG1 is connected with one electrode of an alternating current power supply, and the other alternating current input end of the bridge stack BG1 is directly connected with the other electrode of the alternating current power supply;

an electrolytic capacitor CE1 connected in parallel with the two output terminals of the bridge stack BG 1;

The sampling resistor RS, the LED1, the LEDs 2, … … LEDN and the inductance coil L1 are connected in series between the positive output end of the bridge stack BG1 and the drain electrode of the NMOS tube Q1;

a negative input end of the first comparator U1A is connected with the positive electrode of the electrolytic capacitor CE1, and a positive input end thereof is connected with the positive electrode of the LED1 and the common end of the sampling resistor RS;

A negative input end of the second comparator U2A is connected with the output end of the first comparator U1A, a positive input end is connected to the ground through a voltage regulator tube ZV1, and an output end is connected with the grid electrode of an NMOS tube Q1;

An NMOS transistor Q1, the source of which is grounded;

a freewheeling diode D1, the anode of which is connected with the drain of the NMOS tube Q1 and the cathode of which is connected with the anode of the LED 1;

The components are welded on the PCB aluminum substrate (2).

3. the street light with non-isolated LED drive as claimed in claim 1, wherein the housing (5) is made of aluminum.