CN201947497U - LED street lamp constant current drive device - Google Patents

Abstract

The utility model discloses a LED street lamp constant current drive arrangement, this constant current drive arrangement are through mainly the steady voltage switch module that comprises PFC circuit to the constant current drive module who comprises at least one isolation or non-isolation DC/DC constant current drive circuit provides invariable operating current to the LED array. Because the voltage stabilizing switch module adopts the PFC circuit, the conversion efficiency and the power factor can be improved; meanwhile, the ripple current of a large electrolytic capacitor in the circuit is reduced, and the service life is prolonged. The constant current driving module adopts a low-power non-isolated or isolated DC/DC constant current driving circuit special for the LED driving chip, and the non-isolated or isolated DC/DC constant current driving circuit is added according to the illumination requirement of the street lamp, so that modularization can be formed, the cost is reduced, and the universality is improved; the isolation constant current driving circuit comprises protection circuits such as overvoltage, undervoltage, overpower, short circuit and overtemperature, and can improve the reliability of the constant current driving circuit.

Description

LED street lamp constant current drive device

technical field

The utility model relates to the technical field of drive control circuits, in particular to a control device for constant current drive circuits of LED street lamps.

Background technique

Due to the high light efficiency, energy saving and environmental protection of LEDs, they are widely used in street lighting. However, because street lights are usually installed in a relatively high position and require a relatively large area to be illuminated, LEDs used as street light sources are usually composed of dozens or even up to A matrix composed of hundreds of high-power LEDs, the LED matrix is composed of multiple series-connected LEDs connected in parallel.

The existing LED street lamp control circuit uses a high-frequency switching power supply and a constant current drive circuit, and the high-frequency switching power supply and the constant current drive circuit are independent circuits, and a constant voltage is output through an ordinary regulated switching power supply; the constant current drive circuit uses a dedicated The LED driver chip is designed as a constant current driver. If either of these two parts is missing, the LED street lamp cannot be turned on. This technology has the following deficiencies: (1) Since the switching power supply and the constant current driver are separated, in practice the power supply needs to be designed by a professional power supply manufacturer, and the driver is often designed by the LED lighting manufacturer, so it is easy to have a matching between the power supply and the constant current driver Problems; (2) Since the operating frequency of the dedicated LED driver chip is usually relatively high, from several hundred kilohertz to more than 1 MHz, the reliability of the switching tube is poor, the switching loss is large, and the efficiency is low; (3) Due to the low efficiency of the driver, and in order to reduce The distance between the driver and the LED array is usually to make the driver as close as possible to the LED array. During operation, the driver will have a high operating temperature due to the heat generated by the LED array. Therefore, it is necessary to use a heat-conducting aluminum substrate as the LED driver board, and its cost is high.

Utility model content

The technical problem mainly solved by the utility model is to provide a low-cost, high-efficiency, high-reliability LED street lamp constant current drive device.

In order to solve the above problems, the utility model provides a LED street lamp constant current driving device, the LED street lamp constant current driving device includes a voltage stabilizing switch module and a constant current driving module connected with the voltage stabilizing switch module, wherein the voltage stabilizing The switch module includes a PFC circuit and an isolated converter connected to the output end of the PFC circuit. The constant current drive module includes at least one non-isolated DC-DC constant current drive circuit connected to the output of the isolated converter. The at least one non-isolated The isolated DC-DC constant current driving circuit is connected with one LED or an LED array composed of at least two serially connected LEDs.

Preferably, the voltage stabilizing switch module further includes an EMI circuit and a rectification circuit connected to the input end of the PFC circuit.

Preferably, the at least one non-isolated DC-DC constant current drive circuit includes a protection circuit.

Preferably, the protection circuit includes overvoltage, undervoltage, overpower, short circuit and overtemperature protection circuits.

Preferably, the isolation converter includes an isolation transformer.

The utility model also provides another LED street lamp constant current driving device, which includes a voltage stabilizing switch module and a constant current driving module connected with the voltage stabilizing switch module, the voltage stabilizing switch module includes an interleaved PFC circuit, the constant voltage The current drive module includes at least one isolated DC-DC constant current drive circuit connected to the output of the interleaved PFC circuit, and the at least one isolated DC-DC constant current drive circuit is connected to an LED or an LED composed of at least two LEDs connected in series Array connection.

Preferably, the voltage stabilizing switch module further includes an EMI and rectification circuit connected to the output end of the interleaved PFC circuit.

Preferably, the at least one isolated DC-DC constant current drive circuit includes a protection circuit.

Preferably, the protection circuit includes overvoltage, undervoltage, overpower, short circuit and overtemperature protection circuits.

The utility model LED street lamp constant current drive device, the constant current drive device is mainly composed of a PFC circuit voltage regulator switch module, and at least one isolated or non-isolated DC/DC constant current drive circuit The constant current drive module is used to control the LED. The array provides a constant operating current. Since the voltage stabilizing switch module adopts the PFC circuit, the conversion efficiency and power factor can be improved; at the same time, the ripple current of the large electrolytic capacitor in the circuit can be reduced to prolong the service life. The constant current drive module adopts a low-power DC/DC constant current drive circuit dedicated to LED drive chips. According to the needs of street lighting, a non-isolated or isolated DC/DC constant current drive circuit can be added to form modularization, reduce costs, and improve its efficiency. Versatility; the isolated constant current drive circuit includes protection circuits such as overvoltage, undervoltage, overpower, short circuit, and overtemperature, which can improve the reliability of the constant current drive circuit.

The LED array adopts a series-parallel driving mode, so that it is convenient to increase or decrease the constant current modules according to the actual parallel connection of LED lamps.

Description of drawings

Fig. 1 is a functional block diagram of an embodiment of a constant current drive device for LED street lamps of the present invention.

Fig. 2 is a schematic block diagram of another embodiment of the constant current drive device for LED street lamps of the present invention.

Below in combination with the embodiments, and with reference to the accompanying drawings, the realization, functional characteristics and advantages of the utility model will be further described.

Detailed ways

As shown in FIG. 1 , the utility model provides an embodiment of a constant current driving device for LED street lamps.

The LED street lamp constant current driving device includes: a voltage stabilizing switch module 1 and a constant current driving module 2 connected to the output end of the voltage stabilizing switch module 1, wherein the voltage stabilizing switch module 1 includes a PFC circuit 11 and is connected to the PFC circuit The isolated converter 12 connected to the output terminal of 11, the constant current drive module 2 includes at least one non-isolated DC-DC constant current drive circuit 21 connected to the output of the isolated converter 12, the at least one non-isolated DC-DC constant The current drive circuit 21 is connected to an LED or an LED array 3 consisting of at least two LEDs connected in series. The voltage stabilizing switch module 1 also includes an EMI and rectification circuit 10 connected to the input end of the PFC circuit 11 .

The quantity of the at least one non-isolated DC-DC constant current drive circuit 21 can be set according to the quantity of the LED array 3, such as one, two or more can be set, the at least one non-isolated DC-DC constant current drive circuit 21 A protection circuit is included, and the protection circuit includes adopting existing protection circuits such as overvoltage, undervoltage, overpower, short circuit, and overtemperature.

During work, the voltage stabilizing switch module 1 is connected to a 90V-250V voltage, and the input alternating current is rectified by the rectifier circuit, and the interference signal is filtered out by the EMI (Electro Magnetic Interference, electromagnetic interference) circuit to prevent the power switch High-frequency disturbances caused by modules. Then, the PFC circuit 11 performs processing, and outputs a high-voltage direct current signal. The isolation converter 12 performs isolation conversion processing on the high-voltage DC signal output by the PFC circuit 11, and outputs a low-voltage signal. The isolation converter 12 may be an isolation transformer.

At least one non-isolated DC/DC constant current drive circuit 21 on the constant current drive module 2 outputs a constant current that can control the LED array after processing.

The utility model LED street lamp constant current driving device, the constant current driving device through the voltage stabilizing switch module 1 mainly composed of PFC circuit 11, and the constant current driving module 2 composed of at least one non-isolated DC/DC constant current driving circuit 21 A constant operating current is provided to the LED array 3 . Since the voltage stabilizing switch module 1 adopts the PFC circuit 11, the conversion efficiency and power factor can be improved; at the same time, the ripple current of the large electrolytic capacitor in the circuit can be reduced to prolong the service life. The constant-current drive module 2 adopts a low-power non-isolated DC/DC constant-current drive circuit 21 dedicated to LED drive chips, and a non-isolated DC/DC constant-current drive circuit is added according to the needs of street lamp lighting, which can form modularization and reduce costs. Improve its versatility; the non-isolated DC/DC constant current drive circuit 21 includes protection circuits such as overvoltage, undervoltage, overpower, short circuit, and overtemperature, which can improve the reliability of the constant current drive circuit.

The LED array 3 is driven in series and parallel, so that it is convenient to increase or decrease the constant current modules according to the actual parallel connection of LED lamps.

As shown in FIG. 2 , the utility model provides another embodiment of a constant current driving device for LED street lamps.

The LED street lamp constant current driving device includes: a voltage stabilizing switch module 1 and a constant current driving module 2 connected to the output of the voltage stabilizing switch module 1, the voltage stabilizing switch module 1 includes an interleaved PFC circuit 13, and the constant current The drive module includes at least one isolated DC-DC constant current drive circuit 22 connected to the output of the interleaved PFC circuit 2, and the at least one isolated DC-DC constant current drive circuit 22 is connected to an LED or at least two series The LED array consists of 3 connections. The voltage stabilizing switch module 1 also includes an EMI and rectification circuit 10 connected to the input end of the PFC circuit 11 .

The number of the at least one isolated DC-DC constant current drive circuit 22 can be set according to the number of LED arrays 3, such as one, two or more can be set, the at least one isolated DC-DC constant current drive circuit 22 includes protection circuit, the protection circuit includes over-voltage, under-voltage, over-power, short-circuit, and over-temperature protection circuits.

When working, the voltage stabilizing switch module 1 is connected to a voltage of 90V-250V, and the input AC power is rectified by the rectifier circuit, and various interference signals are filtered out by the EMI circuit, so as to prevent high-frequency disturbances formed by the power switch circuit. run away. Then, the PFC circuit 11 processes and outputs a high-voltage direct current signal. The isolated DC/DC constant current drive circuit 22 processes the high voltage direct current signal output by the PFC circuit 11 and outputs a signal capable of controlling the LED array 3 .

The utility model LED street lamp constant current drive device, the constant current drive device is mainly composed of a PFC circuit voltage regulator switch module, and the constant current drive module is composed of at least one isolated DC/DC constant current drive circuit to provide constant current to the LED array. working current. Since the voltage stabilizing switch module adopts the PFC circuit, the conversion efficiency and power factor can be improved; at the same time, the ripple current of the large electrolytic capacitor in the circuit can be reduced to prolong the service life. The constant current drive module adopts a low-power isolated DC/DC constant current drive circuit dedicated to LED drive chips, which can be modularized to reduce costs, increase the number of isolated DC/DC constant current drive circuits according to street lighting needs, and improve its performance. Versatility: The isolated DC/DC constant current drive circuit 22 includes protection circuits such as overvoltage, undervoltage, overpower, short circuit, and overtemperature, which can improve the reliability of the constant current drive circuit.

The LED array adopts a series-parallel driving mode, so that it is convenient to increase or decrease the constant current modules according to the actual parallel connection of LED lamps.

The above descriptions are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the specification of the utility model and the contents of the accompanying drawings may be directly or indirectly used in Other relevant technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (9)

1. A constant current driving device for LED street lamps, comprising a voltage stabilizing switch module and a constant current driving module connected to the output of the voltage stabilizing switch module, characterized in that: The voltage stabilizing switch module includes a PFC circuit and an isolated converter connected to the output end of the PFC circuit, and the constant current drive module includes at least one non-isolated DC-DC constant current drive circuit connected to the output of the isolated converter, The at least one non-isolated DC-DC constant current driving circuit is connected with an LED or an LED array composed of at least two serially connected LEDs. 2. The LED street lamp constant current driving device according to claim 1, characterized in that: The voltage stabilizing switch module also includes an EMI circuit and a rectifying circuit connected to the input end of the PFC circuit. 3. The LED street lamp constant current drive device according to claim 1, characterized in that: The at least one non-isolated DC-DC constant current drive circuit includes a protection circuit. 4. The LED street lamp constant current drive device according to claim 3, characterized in that: The protection circuit includes overvoltage, undervoltage, overpower, short circuit and overtemperature protection circuits. 5. The LED street lamp constant current driving device according to claim 1, characterized in that: The isolation converter includes an isolation transformer. 6. A constant current driving device for LED street lamps, comprising a voltage stabilizing switch module and a constant current driving module connected to the voltage stabilizing switch module, characterized in that: The voltage stabilizing switch module includes an interleaved PFC circuit, and the constant current drive module includes at least one isolated DC-DC constant current drive circuit connected to the output of the interleaved PFC circuit, and the at least one isolated DC-DC constant current drive circuit The circuit is connected to an LED or an LED array consisting of at least two LEDs connected in series. 7. The LED street lamp constant current driving device according to claim 6, characterized in that: The voltage stabilizing switch module also includes an EMI and rectification circuit connected to the output end of the interleaved PFC circuit. 8. The LED street lamp constant current driving device according to claim 6, characterized in that: The at least one isolated DC-DC constant current drive circuit includes a protection circuit. 9. The LED street lamp constant current driving device according to claim 8, characterized in that: The protection circuit includes overvoltage, undervoltage, overpower, short circuit and overtemperature protection circuits.

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