CN211128316U - L ED constant current driving power supply for replacing double-circuit ballast - Google Patents

Abstract

The utility model discloses a replace L ED constant current drive power supply of double-circuit ballast, including the EMC circuit, exchange the passageway signal detection and switching circuit, adjust luminance level converting circuit, rectification filter circuit, PFC circuit, voltage limiting constant current circuit and L ED drive master control circuit, the utility model discloses the input connects double-circuit AC power supply, the former equipment service environment of adaptation, after double-circuit AC power supply input, through the EMC circuit, exchange passageway signal detection and switching circuit, filter circuit, PFC circuit, behind the constant voltage current-limiting circuit, output to load, for L ED lamps and lanterns provide input power, exchange passageway signal detection and switching circuit, adjust luminance level converting circuit and L ED drive master control circuit collaborative work, accomplish current lamps and lanterns state and detect, judge and parameter adjustment, realize whole power module's high power factor and high efficiency output.

Description

L ED constant current driving power supply for replacing double-circuit ballast

The technical field is as follows:

the utility model relates to an L ED drive power supply technical field especially relates to a L ED constant current drive power supply who replaces double-circuit ballast.

Background art:

in the past, the lighting solution of a fluorescent tube is generally adopted in the regional lighting construction. In application occasions such as schools, factory buildings, indoor venues and the like, two fluorescent tubes are generally arranged in one base, and two different lighting states of single-tube lighting and double-tube lighting are completed through switch combination switching so as to meet different lighting brightness and energy consumption requirements.

With the gradual maturity of L ED lighting technology, because it has the characteristics of energy saving and high efficiency, the lighting scheme of fluorescent tube has been replaced gradually, the existing fluorescent tube transformation scheme can only realize that single L ED driving power supply replaces the corresponding fluorescent tube ballast power supply system, and can not satisfy the above application scenarios, under the condition of double-circuit alternating current power supply, the use requirements of different brightness and energy consumption are realized through switch combination switching.

The utility model has the following contents:

to the above problem, the to-be-solved technical problem of the utility model is to provide a replace L ED constant current drive power supply of double-circuit ballast, detect and switch circuit, adjust luminance level conversion circuit, rectification filter circuit, PFC circuit, voltage limiting constant current circuit and L ED drive main control circuit including EMC circuit, interchange channel signal, EMC circuit, interchange channel signal detect and switch circuit, rectification filter circuit, PFC circuit and voltage limiting constant current circuit electric connection in proper order, interchange channel signal detects and switch circuit, adjusts luminance level conversion circuit, L ED drive main control circuit and voltage limiting constant current circuit electric connection in proper order, PFC circuit electric connection L ED drive main control circuit, voltage limiting constant current circuit connection load.

Preferably, the EMC circuit adopts a common mode inductor, a differential mode inductor, an X-type safety capacitor and a Y-type safety capacitor.

Preferably, the hardware part of the PFC module adopts a boost converter.

The utility model discloses beneficial effect:

(1) the utility model discloses input power supply can insert double-circuit alternating current power supply, the original scene of using of adaptation user.

(2) The utility model discloses can switch according to the switch combination, realize that L ED lamps and lanterns's two kinds of user state of half power and full power switch, accord with former use habit and demand of user.

(3) The utility model discloses the former scene of using of input power, control circuit adaptation, it is low to reform transform construction cost.

(4) The utility model discloses possess power factor adjustment module, can realize high power factor and efficient constant current source output.

(5) The utility model discloses a special chip realizes DC dimming function, can provide not have stroboscopic L ED lamps and lanterns user experience.

Description of the drawings:

for ease of illustration, the invention is described in detail by the following detailed description and accompanying drawings.

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is an EMC circuit schematic;

FIG. 3 is a schematic diagram of AC power signal detection;

FIG. 4 is a schematic diagram of a half-power control circuit;

FIG. 5 is a schematic diagram of an AC rectifier circuit;

fig. 6 is a schematic diagram of a PFC circuit;

FIG. 7 is a schematic diagram of a voltage-limiting constant current circuit;

FIG. 8 is a principal control diagram of L ED driving power;

fig. 9 is a schematic diagram of an embodiment.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

As shown in fig. 1-9, the utility model discloses a replace L ED constant current drive power supply of double-circuit ballast, detect and switch circuit, the level conversion circuit that adjusts luminance, rectification filter circuit, PFC circuit, voltage limiting constant current circuit and L ED drive master control circuit including EMC circuit, interchange channel signal, the input of EMC circuit inserts has double-circuit AC power supply, EMC circuit, interchange channel signal detect and switch circuit, rectification filter circuit, PFC circuit and voltage limiting constant current circuit electric connection in proper order, interchange channel signal detects and switch circuit, the level conversion circuit that adjusts luminance, L ED drive master control circuit and voltage limiting constant current circuit electric connection in proper order, PFC circuit electric connection L ED drive master control circuit, voltage limiting constant current circuit connects the load.

Specifically, the utility model discloses a EMC circuit, interchange channel signal detect and switching circuit, adjust luminance level shift circuit, rectification filter circuit, PFC circuit, voltage limiting constant current circuit and L ED drive master control circuit, its functional block diagram is seen in figure 1.

The utility model discloses the input connects double-circuit AC power supply, adaptation existing equipment service environment double-circuit AC power supply input extremely the utility model discloses afterwards, after EMC circuit, alternating current channel signal detected and switching circuit, filter circuit, PFC circuit, constant voltage current limiting circuit, output to load, for L ED lamps and lanterns provide input power supply, the utility model discloses well alternating current channel signal detected and switching circuit, level conversion circuit and the L ED drive master control circuit collaborative work of adjusting luminance, accomplished current lamps and lanterns state and detected, judge and parameter adjustment, realized whole power module's high power factor and high efficiency output.

The EMC circuit adopts a common-mode inductor, a differential-mode inductor, an X-type safety capacitor and a Y-type safety capacitor, has the functions of safety guarantee and electromagnetic radiation inhibition, and realizes the relevant standards of EMI, and the realization schematic diagram is shown in figure 2.

The alternating current channel signal detection and switching circuit is divided into an alternating current power supply signal detection circuit and a half-power control circuit, and the implementation schematic diagram of the alternating current channel signal detection and switching circuit is shown in figures 3-4.

The dimming level conversion circuit adopts a high-integration-level special chip to realize a DC dimming function.

The rectification filter circuit adopts a high-voltage high-power bridge stack to realize the function of an alternating current rectification circuit, and the implementation schematic diagram is shown in figure 5.

The PFC module hardware part adopts a boost converter and works in a critical current mode through a digital controller, and a power MOSFET has low switching loss and good EMI (electro-magnetic interference) characteristic in the critical current mode; the PFC algorithm is based on timing switch control and compensation for dead time after the boost inductor is reset, and a high PF value and a low THD (total harmonic distortion of current) can be obtained under a light load condition through the algorithm, and an implementation schematic thereof is shown in fig. 6.

The hardware topology of the constant-current voltage limiting circuit adopts a quasi-resonance flyback circuit, source side current is controlled cycle by cycle through a digital controller, L ED driving current constant output and linear adjustment (linear dimming) are achieved, limit control over output voltage is achieved by sampling voltage of a source side auxiliary winding, an output direct-current power supply achieves an output power supply signal rectification function through a rectifier tube and a conjugate coil, and the implementation schematic diagram is shown in figure 7.

L ED driving power supply main control monitors PFC circuit and voltage-limiting constant current circuit in real time through main control chip, dynamically adjusts circuit relevant parameters, realizes complete machine high power factor and high-efficiency constant current output, and its schematic diagram is shown in figure 8 below.

As the embodiment of fig. 9, the utility model discloses when using, be connected to switch panel through the double-circuit live wire, be connected to the electric wire netting return circuit through the zero line, through L ED lamps and lanterns power input/output interface connection to load (L ED lamps and lanterns), operate double-circuit switch panel during the use, through the switch combination switching, can realize L ED lamps and lanterns load half-power, the operating condition of two kinds of differences of full power, satisfy the user demand of different luminance of user, different energy consumptions.

Claims (3)

1. The L ED constant current driving power supply capable of replacing a double-channel ballast is characterized by comprising an EMC circuit, an alternating current channel signal detecting and switching circuit, a dimming level conversion circuit, a rectifying filter circuit, a PFC circuit, a voltage-limiting constant current circuit and a L ED driving main control circuit, wherein the input end of the EMC circuit is connected with the double-channel alternating current power supply, the EMC circuit, the alternating current channel signal detecting and switching circuit, the rectifying filter circuit, the PFC circuit and the voltage-limiting constant current circuit are electrically connected in sequence, the alternating current channel signal detecting and switching circuit, the dimming level conversion circuit, the L ED driving main control circuit and the voltage-limiting constant current circuit are electrically connected in sequence, the PFC circuit is electrically connected with the L ED driving main control circuit, and the voltage-limiting constant current circuit is connected with a load.

2. The L ED constant current drive power supply for replacing a two-way ballast as claimed in claim 1, wherein the EMC circuit employs common mode inductance, differential mode inductance, X-type safety regulation capacitance and Y-type safety regulation capacitance.

3. The L ED constant current driving power supply for replacing two-way ballast as claimed in claim 1, wherein the PFC module hardware part adopts boost converter.

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