CN211267180U

CN211267180U - Constant voltage source circuit of LED signal lamp

Info

Publication number: CN211267180U
Application number: CN202020398309.1U
Authority: CN
Inventors: 占晓斌
Original assignee: Hangzhou Yunzheng Technology Co ltd
Current assignee: Hangzhou Yunzheng Technology Co ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2020-08-14
Anticipated expiration: 2030-03-25

Abstract

The utility model provides a LED signal lamp constant voltage source circuit. The LED signal lamp constant voltage source circuit comprises a transformer T; the constant-voltage power supply comprises a constant-voltage power supply module, an electric bridge D, an electrolytic capacitor C1, a voltage stabilizing chip I, an inductor L, a sampling resistor R1, a sampling resistor R2, an electrode capacitor C2 and a transient diode VD1, wherein the input end of the constant-voltage power supply module is electrically connected with the output end of a transformer T, the output negative end of the constant-voltage power supply module is grounded, a plurality of diode groups VD are connected with the output positive end of the constant-voltage power supply module in parallel, and the negative ends of the diode groups VD are grounded. The utility model provides a LED signal lamp constant voltage source circuit has simple structure, can effectively guarantee LED signal lamp supply voltage and current stabilization, can effectively avoid the LED signal lamp to appear the advantage of loss problem.

Description

Constant voltage source circuit of LED signal lamp

Technical Field

The utility model relates to a traffic signal lamp technical field especially relates to a LED signal lamp constant voltage source circuit.

Background

At present, the luminous source of the traffic signal lamp on the market mostly takes the LED as the main part, the LED lamp beads are mostly connected in series in the circuit as a group, a plurality of groups are connected in parallel, and the working power circuit of the LED traffic signal lamp has a plurality of modes.

However, the conventional power supply circuit design of the LED traffic signal lamp has the disadvantages that the total current of the adopted constant current source circuit is not changed, when one LED in the series group has a quality problem and cannot be displayed, the current of the group of LEDs flows to other groups, so that the current of other groups of LEDs exceeds the normal working current range, and more quality problems are caused, and therefore, the working mode of the constant current source has great quality hidden trouble.

Therefore, it is necessary to provide a new constant voltage power supply circuit for LED signal lamps to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide a simple structure, can effectively guarantee LED signal lamp supply voltage and stable, can effectively avoid the LED signal lamp to appear the LED signal lamp constant voltage power supply circuit that loss problem all at one's expense.

In order to solve the above technical problem, the utility model provides a LED signal lamp constant voltage source circuit includes: a transformer T; the constant-voltage power supply comprises a constant-voltage power supply module, an electric bridge D, an electrolytic capacitor C1, a voltage stabilizing chip I, an inductor L, a sampling resistor R1, a sampling resistor R2, an electrode capacitor C2 and a transient diode VD1, wherein the input end of the constant-voltage power supply module is electrically connected with the output end of a transformer T, the output negative end of the constant-voltage power supply module is grounded, a plurality of diode groups VD are connected with the output positive end of the constant-voltage power supply module in parallel, and the negative ends of the diode groups VD are grounded.

Preferably, one end of the anode of the electrolytic capacitor C1 is electrically connected to the anode of the output terminal of the bridge D, one end of the cathode of the electrode capacitor C1 is electrically connected to the cathode of the output terminal of the bridge D, the input terminal of the voltage stabilization chip I is electrically connected to the anode of the electrolytic capacitor C1, one end of the inductor L and the cathode of the transient diode VD1 are electrically connected to the anode of the output terminal of the voltage stabilization chip I, the other end of the inductor L is electrically connected to one end of the sampling resistor R1 and the anode of the electrolytic capacitor C2, the other end of the sampling resistor R1 is electrically connected to the cathode of the output terminal of the voltage stabilization chip I, the anode of the transient diode VD1 is electrically connected to the cathode of the electrolytic capacitor C1, one end of the sampling resistor R2 is electrically connected to the cathode of the output terminal of the voltage stabilization chip I, the other end of the sampling resistor R2 is electrically connected to the anode of the transient diode VD1, and the cathode of the electrolytic capacitor C63.

Preferably, the input of the transformer T is 220V ac, and the output voltage of the transformer T is 24V ac.

Preferably, the capacitance value of the electrolytic capacitor C1 is 470nF, and the capacitance value of the electrolytic capacitor C2 is 220 nF.

Preferably, the inductance of the inductor L is 33 [ mu ] H.

Preferably, the model of the voltage stabilizing chip I is XL 2596-ADJ.

Compared with the prior art, the utility model provides a LED signal lamp constant voltage source circuit has following beneficial effect:

the utility model provides a constant voltage source circuit of LED signal lamp, commutate the alternating current through electric bridge D, thus make the alternating current become the direct current, filter the direct current after the rectification through electrolytic capacitor C1, thus can make the pulsating direct current become level and smooth, cooperate through voltage stabilizing chip I and transient diode VD1, thus can stabilize the direct current voltage, when diode group VD goes wrong, because the voltage that it disposes only guarantees the needs that diode group VD normally works, and will not change because of the quantity reduction of diode group VD, diode group VD goes wrong, can only change the output power P of power, the voltage U of power output does not change, the quantity of diode group VD has reduced during operation, total current I also can reduce, so total power P can reduce, along with the reduction of power P, the impact influence to the electrical aspect of remaining diode group VD will reduce, without the quality problems of large area LEDs.

Drawings

Fig. 1 is a circuit diagram of a preferred embodiment of a constant voltage power supply circuit of an LED signal lamp provided by the present invention;

fig. 2 is a circuit diagram of a medium constant voltage source module according to a preferred embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

Please refer to fig. 1 and fig. 2 in combination, wherein fig. 1 is a circuit diagram of a preferred embodiment of a constant voltage power supply circuit of an LED signal lamp according to the present invention; fig. 2 is a circuit diagram of a medium constant voltage source module according to a preferred embodiment of the present invention. The LED signal lamp constant voltage source circuit comprises: a transformer T; the constant-voltage power supply comprises a constant-voltage power supply module, an electric bridge D, an electrolytic capacitor C1, a voltage stabilizing chip I, an inductor L, a sampling resistor R1, a sampling resistor R2, an electrode capacitor C2 and a transient diode VD1, wherein the input end of the constant-voltage power supply module is electrically connected with the output end of a transformer T, the output negative end of the constant-voltage power supply module is grounded, a plurality of diode groups VD are connected with the output positive end of the constant-voltage power supply module in parallel, and the negative ends of the diode groups VD are grounded.

The positive pole one end of electrolytic capacitor C1 and the positive pole electric connection of bridge D output end, the negative pole one end of electrode capacitor C1 and the negative pole electric connection of bridge D output end, the input of steady voltage chip I and the positive pole one end electric connection of electrolytic capacitor C1, the one end of inductance L and the negative pole of transient diode VD1 all with the positive pole electric connection of steady voltage chip I output end, the other end of inductance L and the one end of sampling resistor R1 and the positive pole electric connection of electrolytic capacitor C2, the other end of sampling resistor R1 and the negative pole electric connection of steady voltage chip I output end, the positive pole of transient diode VD1 and the negative pole electric connection of electrolytic capacitor C1, the one end of sampling resistor R2 and the negative pole electric connection of steady voltage chip I output end, the other end of sampling resistor R2 and the positive pole electric connection of transient diode VD1, the negative pole of electrolytic capacitor C2 and the positive pole electric connection of transient diode VD 1.

The input of the transformer T is alternating current 220V, and the output voltage of the transformer T is alternating current 24V.

The capacitance value of the electrolytic capacitor C1 is 470nF, and the capacitance value of the electrolytic capacitor C2 is 220 nF.

The inductance value of the inductance L is 33 mu H.

The model of the voltage stabilization chip I is XL 2596-ADJ.

The utility model provides a LED signal lamp constant voltage source circuit's theory of operation as follows:

when the constant-voltage power supply is used, 220V mains supply is reduced into 24V alternating current after passing through a transformer T, the 24V alternating current is output as 24V pulsating direct current after passing through a bridge D of a constant-voltage source module, the pulsating direct current is filtered by an electrolytic capacitor C1 and then is converted into smooth direct current, the smooth direct current is subjected to voltage stabilization by a voltage stabilizing chip I and a transient diode, the transient diode VD1 provides an extra current path in a circuit, the high-voltage circuit is prevented from being burnt out due to sudden current change, the voltage in the circuit is sampled and fed back to the voltage stabilizing chip I for reference by sampling resistors R1 and R2, the output current is re-filtered by the electrolytic capacitor C2, so that the output voltage is more stable, the constant-voltage direct current is transmitted to a diode group VD, when a certain group in the diode group VD is damaged, the voltages of other groups are constant.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims

1. An LED signal lamp constant voltage power supply circuit, comprising:

a transformer T;

the constant voltage source module comprises an electric bridge D, an electrolytic capacitor C1, a voltage stabilizing chip I, an inductor L, a sampling resistor R1, a sampling resistor R2, an electrode capacitor C2 and a transient diode VD1, wherein the input end of the constant voltage source module is electrically connected with the output end of the transformer T, and the output negative end of the constant voltage source module is grounded;

the constant voltage source module comprises a plurality of diode groups VD, a plurality of diodes groups VD and a plurality of constant voltage source modules, wherein the positive ends of the diode groups VD are electrically connected with the output positive end of the constant voltage source module, the diode groups VD are connected in parallel, and the negative ends of the diode groups VD are all grounded.

2. The LED signal lamp constant voltage source circuit as claimed in claim 1, wherein an anode end of the electrolytic capacitor C1 is electrically connected to an anode of an output terminal of the bridge D, a cathode end of the electrode capacitor C1 is electrically connected to a cathode of an output terminal of the bridge D, an input terminal of the voltage stabilization chip I is electrically connected to an anode end of the electrolytic capacitor C1, one end of the inductor L and a cathode of the transient diode VD1 are electrically connected to an anode of an output terminal of the voltage stabilization chip I, the other end of the inductor L is electrically connected to one end of the sampling resistor R1 and a cathode end of the electrolytic capacitor C2, the other end of the sampling resistor R1 is electrically connected to a cathode of an output terminal of the voltage stabilization chip I, an anode of the transient diode VD1 is electrically connected to a cathode of the electrolytic capacitor C1, one end of the sampling resistor R2 is electrically connected to a cathode of the output terminal of the voltage stabilization chip I, and the other end of the sampling resistor R2 is electrically connected to an, the cathode of the electrolytic capacitor C2 is electrically connected with the anode of the transient diode VD 1.

3. The constant voltage power supply circuit for the LED signal lamp as claimed in claim 1, wherein the input of the transformer T is AC 220V, and the output voltage of the transformer T is AC 24V.

4. The LED signal lamp constant voltage power supply circuit as claimed in claim 1, wherein the capacitance value of the electrolytic capacitor C1 is 470nF, and the capacitance value of the electrolytic capacitor C2 is 220 nF.

5. The LED signal lamp constant voltage source circuit according to claim 1, wherein the inductance of the inductor L is 33 μ H.

6. The constant-voltage power supply circuit of the LED signal lamp as claimed in claim 1, wherein the model of the voltage-stabilizing chip I is XL 2596-ADJ.