CN211267180U - A LED signal lamp constant voltage source circuit - Google Patents

Abstract

The utility model provides a constant voltage source circuit of an LED signal lamp. The constant voltage source circuit of the LED signal lamp includes a transformer T; a constant voltage source module, the input end of the constant voltage source module is electrically connected with the output end of the transformer T, and the constant voltage source module further includes a bridge D, an electrolytic capacitor C1, voltage regulator chip I, inductance L, sampling resistor R1, sampling resistor R2, electrode capacitor C2 and transient diode VD1, the output negative terminal of the constant voltage source module is grounded; a plurality of diode groups VD, a plurality of the diode groups VD The positive terminal of the diode is electrically connected to the output positive terminal of the constant voltage source module, the multiple diode groups VD are connected in parallel, and the negative terminals of the multiple diode groups VD are all grounded. The constant voltage source circuit of the LED signal lamp provided by the utility model has the advantages of simple structure, can effectively ensure the stability of the power supply voltage and current of the LED signal lamp, and can effectively avoid the problem of one damage and one loss of the LED signal lamp.

Description

A LED signal lamp constant voltage source circuit

technical field

The utility model relates to the technical field of traffic signal lamps, in particular to a constant voltage source circuit of an LED signal lamp.

Background technique

At present, the light source of traffic signal lights on the market is mostly LED. LED lamp beads are mostly connected in series in the circuit, and multiple groups are connected in parallel. However, there are many ways to make the power supply circuit work. At present, LED traffic lights The working power circuit of the LED is basically a constant current source circuit, and the total output current is unchanged, and the voltage changes with the change of the LED working state.

However, there are still shortcomings in the power supply circuit design of the traditional LED traffic lights. The total current of the constant current source circuit used in the constant current source circuit remains unchanged. The current will flow to other groups, causing the current of other LED groups to exceed the normal working current range, causing more quality problems. Therefore, the working mode of the constant current source has a great quality hidden danger.

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

Utility model content

The technical problem solved by the utility model is to provide a LED signal lamp constant voltage source circuit with a simple structure, which can effectively ensure the stability of the supply voltage and current of the LED signal lamp, and can effectively avoid the problem of one damage and one damage of the LED signal lamp.

In order to solve the above technical problems, the LED signal lamp constant voltage source circuit provided by the present invention includes: a transformer T; a constant voltage source module, the input end of the constant voltage source module is electrically connected with the output end of the transformer T, The source module also includes a bridge D, an electrolytic capacitor C1, a voltage regulator chip I, an inductor L, a sampling resistor R1, a sampling resistor R2, an electrode capacitor C2 and a transient diode VD1, and the output negative terminal of the constant voltage source module is grounded; multiple diodes In the group VD, the positive terminals of the plurality of diode groups VD are all electrically connected to the output positive terminal of the constant voltage source module, the plurality of diode groups VD are connected in parallel, and the negative terminals of the plurality of diode groups VD are all grounded.

Preferably, the positive terminal of the electrolytic capacitor C1 is electrically connected to the positive terminal of the output terminal of the bridge D, the negative terminal of the electrode capacitor C1 is electrically connected to the negative terminal of the output terminal of the electrical bridge D, and the input terminal of the voltage regulator chip I is electrically connected to the electrolytic capacitor C1 The positive end of the inductance L is electrically connected with the negative electrode of the transient diode VD1 and the positive electrode of the output end of the voltage regulator chip I is electrically connected, and the other end of the inductance L is electrically connected with one end of the sampling resistor R1 and the positive end of the electrolytic capacitor C2. Electrically connected, the other end of the sampling resistor R1 is electrically connected to the negative electrode of the output end of the voltage regulator chip I, the positive electrode of the transient diode VD1 is electrically connected to the negative electrode of the electrolytic capacitor C1, and one end of the sampling resistor R2 is connected to the output end of the voltage regulator chip I. The negative electrode is electrically connected, the other end of the sampling resistor R2 is electrically connected to the positive terminal of the transient diode VD1, and the negative electrode of the electrolytic capacitor C2 is electrically connected to the positive terminal of the transient diode VD1.

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

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

Preferably, the inductance of the inductor L is 33µH.

Preferably, the model of the voltage regulator chip I is XL2596-ADJ.

Compared with the related art, the LED signal lamp constant voltage source circuit provided by the present invention has the following beneficial effects:

The utility model provides a constant voltage source circuit for an LED signal lamp, which rectifies the alternating current through the bridge D, so that the alternating current becomes direct current, and filters the rectified direct current through the electrolytic capacitor C1, so that the pulsating direct current can be smoothed. Through the cooperation of the voltage regulator chip I and the transient diode VD1, the DC voltage can be stabilized. When there is a problem with the diode group VD, the configured voltage is only required to ensure the normal operation of the diode group VD, not because of the diode group VD. The number of VDs is reduced and changed. The diode group VD has a quality problem. Only the output power P of the power supply can be changed. The output voltage U of the power supply remains unchanged. The number of diode groups VD is reduced during operation, and the total current I will also decrease. Therefore, the total power P will be reduced. With the reduction of the power P, the impact on the electrical aspects of the remaining diode group VD will be reduced, and the quality problem of large-area LEDs will not occur.

Description of drawings

1 is a circuit diagram of a preferred embodiment of a constant voltage source circuit for an LED signal lamp provided by the utility model;

FIG. 2 is a circuit diagram of a medium constant voltage source module of a preferred embodiment of a constant voltage source circuit for an LED signal lamp provided by the present invention.

Detailed ways

The present utility model will be further described below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1 and FIG. 2 in conjunction, wherein, FIG. 1 is a circuit diagram of a preferred embodiment of the constant voltage source circuit for an LED signal lamp provided by the present invention; FIG. 2 is a circuit diagram of the constant voltage source circuit for the LED signal lamp provided by the present invention. A circuit diagram of a medium constant voltage source module of a preferred embodiment. The constant voltage source circuit of the LED signal lamp includes: a transformer T; a constant voltage source module, the input end of the constant voltage source module is electrically connected with the output end of the transformer T, and the constant voltage source module further includes a bridge D, an electrolytic capacitor C1 , voltage regulator chip I, inductance L, sampling resistor R1, sampling resistor R2, electrode capacitor C2 and transient diode VD1, the output negative terminal of the constant voltage source module is grounded; a plurality of diode groups VD, a plurality of the diode groups VD The positive terminal is electrically connected to the output positive terminal of the constant voltage source module, the multiple diode groups VD are connected in parallel, and the negative terminals of the multiple diode groups VD are all grounded.

The positive terminal of the electrolytic capacitor C1 is electrically connected to the positive terminal of the output terminal of the bridge D, the negative terminal of the electrode capacitor C1 is electrically connected to the negative terminal of the output terminal of the electrical bridge D, and the input terminal of the voltage regulator chip I is electrically connected to the positive terminal of the electrolytic capacitor C1. Electrical connection, one end of the inductor L and the negative electrode of the transient diode VD1 are both electrically connected to the positive electrode of the output end of the voltage regulator chip I, and the other end of the inductor L is electrically connected to one end of the sampling resistor R1 and the positive electrode of the electrolytic capacitor C2. , the other end of the sampling resistor R1 is electrically connected to the negative electrode of the output end of the voltage regulator chip I, the positive electrode of the transient diode VD1 is electrically connected to the negative electrode of the electrolytic capacitor C1, and one end of the sampling resistor R2 is electrically connected to the negative electrode of the output end of the voltage regulator chip I Connection, the other end of the sampling resistor R2 is electrically connected to the positive terminal of the transient diode VD1, and the negative terminal of the electrolytic capacitor C2 is electrically connected to the positive terminal of the transient diode VD1.

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

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

The inductance of the inductance L is 33µH.

The model of the voltage regulator chip I is XL2596-ADJ.

The working principle of the constant voltage source circuit of the LED signal lamp provided by the utility model is as follows:

When in use, the 220V mains power is reduced to 24V AC power after passing through the transformer T, and the 24V AC power is outputted as 24V pulsating DC power after passing through the bridge D of the constant voltage source module. The voltage chip I and the transient diode are used for voltage stabilization. The transient diode VD1 provides an additional current path in the circuit to avoid high voltage burning out of the circuit caused by the current sudden change. The sampling resistors R1 and R2 sample the voltage in the circuit and feed it back to the voltage stabilizer. Refer to chip I, the electrolytic capacitor C2 refilters the output current to make the output voltage more stable, and the constant voltage direct current is sent to the diode group VD. The total current decreases and the total power decreases.

Compared with the related art, the LED signal lamp constant voltage source circuit provided by the present invention has the following beneficial effects:

The utility model provides a constant voltage source circuit for an LED signal lamp, which rectifies the alternating current through the bridge D, so that the alternating current becomes direct current, and filters the rectified direct current through the electrolytic capacitor C1, so that the pulsating direct current can be smoothed. Through the cooperation of the voltage regulator chip I and the transient diode VD1, the DC voltage can be stabilized. When there is a problem with the diode group VD, the configured voltage is only required to ensure the normal operation of the diode group VD, not because of the diode group VD. The number of VDs is reduced and changed. The diode group VD has a quality problem. Only the output power P of the power supply can be changed. The output voltage U of the power supply remains unchanged. The number of diode groups VD is reduced during operation, and the total current I will also decrease. Therefore, the total power P will be reduced. With the reduction of the power P, the impact on the electrical aspects of the remaining diode group VD will be reduced, and the quality problem of large-area LEDs will not occur.

The above are only the embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and accompanying drawings of the present invention, or directly or indirectly applied to other Relevant technical fields are similarly included in the scope of patent protection of the present invention.

Claims (6)

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.

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