CN218243909U - Prevent short circuit from resumeing LED power module - Google Patents

Abstract

The utility model relates to the technical field of LED power supply, in particular to a short-circuit-proof self-recovery LED power supply module, which comprises a voltage detection circuit used for detecting the voltage value of an LED output end; the switch enabling circuit is used for controlling the opening or closing of the LED output end, wherein the negative electrode of the LED output end is connected with a pre-opening loop in series; and the main loop is connected with the switch enabling circuit and used for conducting electricity of the LED power supply module. The utility model provides a LED power supply module has a fault self-recovery function, which can reduce the cost of installation and maintenance; the module adopts voltage detection, so that the heat productivity is reduced, and the conversion efficiency is improved; an output enabling end is provided, and the control of the single chip microcomputer is facilitated. And the utility model discloses use and commercialization in solar lighting controller.

Description

Prevent self-resuming LED power module of short circuit

Technical Field

The utility model relates to a LED power supply technical field, concretely relates to prevent self-resuming LED power module of short circuit.

Background

LED lighting has been widely used in street lighting and light scene decoration, and battery power is the preferred option for outdoor 220V power supply free environments. However, due to the complexity of the field environment, the LED or the connection wire may be short-circuited during the construction or work process, thereby seriously damaging the battery and even causing a fire.

Although the traditional fuse can reliably prevent short circuit, the traditional fuse needs to be replaced manually after a fault occurs; the current sampling resistor of 0.5-1 ohm, which is necessary for the current limiting circuit, causes heating loss and reduces the efficiency of the circuit.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model discloses a short-circuit prevention self-recovery LED power supply module which is used for solving the problem that the traditional fuse can reliably place short circuit, but needs to be manually replaced after the fault occurs; the current sampling resistor of 0.5-1 ohm, which is necessary for the current limiting circuit, causes the problem that the heating loss reduces the efficiency of the circuit.

The utility model discloses a following technical scheme realizes:

in a first aspect, the invention provides a short-circuit prevention self-recovery LED power supply module, which comprises

The voltage detection circuit is used for detecting the voltage value of the output end of the LED;

the switch enabling circuit is used for controlling the opening or closing of the LED output end, wherein the negative electrode of the LED output end is connected with a pre-opening loop in series;

and the main loop is connected with the switch enabling circuit and used for conducting electricity of the LED power supply module.

Furthermore, in the voltage detection circuit, the output end of the LED is connected in parallel with the input end of the optocoupler U1 and the resistor R1.

Furthermore, in the voltage detection circuit, when the voltage at the output end of the LED is higher than 2V, the U1 light emitting diode is conducted, the voltage at the c end of the U1 is 0V, and the voltage at the c end of the Q3 is Vin;

when the voltage of the LED output end is lower than 2V, the U1 light emitting diode is cut off, the voltage of the c end of the U1 is Vin, and the voltage of the c end of the Q3 is 0V.

Furthermore, the pre-opening loop is composed of R2 and Q2, and the pre-opening loop is connected with the negative electrode of the LED output end in series.

Furthermore, in the pre-opening loop, when S1 is 0V, Q2 is closed, and the pre-opening loop is disconnected; when S1 is 10V, Q2 is switched on, namely the pre-opening loop is switched on.

Furthermore, when the enable switch is 0V, the pre-open loop is switched on; when the enabling switch is 3.3V-5V, the pre-opening loop is disconnected.

Furthermore, the main loop is composed of an NMOS Q1, and the signals S1 and S2 pass through the phase-AND and then control the g end of the Q1 to realize the connection and disconnection of the main loop.

Furthermore, in the main loop, when the switch enable is 0V and D1 is turned on, the main loop is turned on; when the switch is enabled to be 3.3V-5V or D1 is cut off, the main loop is disconnected.

Furthermore, the LED power supply module is provided with an output short circuit and self-recovery module, when the module is in a normal working state, D1 is conducted, S1 and S2 are both Vin, and Q1 and Q2 are both conducted; at the moment, when the LED _ Out is short-circuited, D1 is cut off, S1 voltage is changed into 0V, Q1 is cut off, Q2 is switched on, and current flows through the pre-opening loop;

when the LED _ Out returns to normal, the LED _ Out is not connected with the load or is connected with the LED, D1 is conducted again, and the main loop is conducted again.

The beneficial effects of the utility model are that:

the utility model provides a LED power supply module has a fault self-recovery function, which can reduce the cost of installation and maintenance; the module adopts voltage detection, so that the heat productivity is reduced, and the conversion efficiency is improved; an output enabling end is provided, and the control of the single chip microcomputer is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of a short-circuit prevention self-recovery LED power supply module.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the short-circuit self-recovery LED power supply module for detecting voltage at an output terminal of a battery power supply according to the present embodiment includes, as shown in fig. 1, a battery power supply input terminal, an LED output terminal, a voltage detection terminal, a switch enable terminal, a pre-open loop, and a main loop, where R1 to R5 are 10K Ω resistors.

In the voltage detection part of the embodiment, the output end of the LED is connected with the input end of the optocoupler U1 and the resistor R1 in parallel. When the voltage at the output end of the LED is higher than 2V, the light emitting diode of U1 is conducted, the voltage at the c end of U1 is 0V, the voltage at the c end of Q3 is Vin, namely the voltage at the end of s2 signal is Vin; when the voltage of the output end of the LED is lower than 2V, the light emitting diode of the U1 is cut off, the voltage of the c end of the U1 is Vin, the voltage of the c end of the Q3 is 0V, and the voltage of the s2 end of the signal is 0V.

In the switch enabling part of the embodiment, when the switch enabling is 0V, the LED output end is opened; when the switch is enabled to be 3.3V-5V, the LED output end is closed. When the switch enable is 0V, the voltage of the c end of the Q4 is Vin, and after passing through a voltage stabilizing diode D3, a signal S1 is stabilized at 10V; when the switch is enabled to be 3.3V-5V, the voltage of the c end of the Q4 is 0V, and the signal S1 is 0V.

The pre-open loop part of the embodiment is composed of R2 and Q2, and the pre-open loop is connected with the cathode of the LED output end in series. When the S1 is 0V, Q2 is closed, namely the pre-opening loop is disconnected; when S1 is 10V, Q2 is switched on, namely the pre-opening loop is switched on. When the enable switch is 0V, the pre-opening loop is switched on; when the enabling switch is 3.3V-5V, the pre-opening loop is disconnected.

The main loop of the present embodiment is composed of NMOS Q1. And after the signals S1 and S2 pass through the phase-AND, the g end of the Q1 is controlled, and the connection and disconnection of the main loop are realized. When the switch enable is 0V and D1 is conducted, the main loop is switched on; when the switch is enabled to be 3.3V-5V or D1 is cut off, the main loop is disconnected.

The power-up sequence of this embodiment is as follows: when the module is powered on, Q1 and Q2 are both disconnected, D1 is also cut off, and the output end of the LED is also 0V. When the output end of the LED is not connected with a load or connected with the LED, after the switch is enabled to be 0V, S2 is changed to be 10V, Q2 is conducted, D1 is conducted, therefore Q1 is conducted, and a main loop is connected; when the output end of the LED is not connected with a load or connected with the LED, after the switch enables to be 3.3V-5V, S2 is changed to 0V, Q2 is cut off, D1 is cut off, therefore Q1 is cut off, and a main loop is disconnected; when the output end of the LED is short-circuited and the switch is enabled to be 0V, S2 is changed to be 10V, Q2 is conducted, but D1 is cut off, Q1 is cut off, and the main loop is disconnected. When Q1 and Q2 are both on, the current passes completely through Q1 and does not pass through Q2 and R2, thus causing no power loss.

In the output short circuit and self-recovery of the embodiment, when the module is in a normal working state, D1 is conducted, S1 and S2 are both Vin, and Q1 and Q2 are both conducted; at the moment, when the LED _ Out is in short circuit, D1 is cut off, S1 voltage becomes 0V, Q1 is cut off, Q2 is conducted, current flows through the pre-opening loop, and the current is Vin/R2, so that the short circuit of the battery at the input end cannot be caused. When the LED _ Out is recovered to be normal, namely the LED _ Out is not connected with a load or is connected with an LED, the D1 is conducted again, the main loop is conducted again, and power supply self-recovery after the fault is realized.

To sum up, the utility model provides a LED power supply module has the trouble self-resuming function, can reduce the cost of installation and maintenance; the module adopts voltage detection, so that the heat productivity is reduced, and the conversion efficiency is improved; an output enabling end is provided, and the control of the single chip microcomputer is facilitated. And the utility model discloses use and commercialization in solar lighting controller.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (9)

1. A short-circuit prevention self-recovery LED power supply module is characterized by comprising

The voltage detection circuit is used for detecting the voltage value of the output end of the LED;

the switch enabling circuit is used for controlling the opening or closing of the LED output end, wherein the negative electrode of the LED output end is connected with a pre-opening loop in series;

and the main loop is connected with the switch enabling circuit and used for conducting electricity of the LED power supply module.

2. The self-recovery LED power supply module capable of preventing short circuit according to claim 1, wherein in the voltage detection circuit, an input end of an optical coupler U1 and a resistor R1 are connected in parallel with an output end of an LED.

3. The self-healing short-circuit-preventing LED power supply module as claimed in claim 2, wherein in the voltage detection circuit, when the voltage at the output end of the LED is higher than 2V, the U1 LED is turned on, the voltage at c end of U1 is 0V, and the voltage at c end of Q3 is Vin;

when the voltage of the LED output end is lower than 2V, the U1 light emitting diode is cut off, the voltage of the c end of the U1 is Vin, and the voltage of the c end of the Q3 is 0V.

4. The short-circuit-prevention self-recovery LED power supply module according to claim 1, wherein the pre-open loop is composed of R2 and Q2, and the pre-open loop is connected in series with a negative electrode of the LED output end.

5. The self-recovery LED power supply module capable of preventing short circuit according to claim 4, wherein in the pre-open loop, when S1 is 0V, Q2 is closed, and the pre-open loop is disconnected; when S1 is 10V, Q2 is switched on, namely the pre-opening loop is switched on.

6. The short-circuit-prevention self-recovery LED power supply module as claimed in claim 4, wherein the pre-open loop is turned on when the enable switch is 0V; when the enabling switch is 3.3V-5V, the pre-opening loop is disconnected.

7. The short-circuit-prevention self-recovery LED power supply module as claimed in claim 1, wherein the main loop is composed of an NMOS Q1, and after the signals S1 and S2 pass through a phase-AND, the g end of the Q1 is controlled to realize the connection and disconnection of the main loop.

8. The short-circuit-prevention self-recovery LED power supply module as claimed in claim 7, wherein in the main loop, when the switch enable is 0V and D1 is turned on, the main loop is turned on; when the switch enable is 3.3V-5V or D1 is cut off, the main loop is disconnected.

9. The short-circuit-prevention self-recovery LED power supply module according to claim 1, wherein the LED power supply module is provided with an output short-circuit and self-recovery module, when the module is in a normal working state, D1 is conducted, S1 and S2 are both Vin, and Q1 and Q2 are both conducted; at the moment, if the LED _ Out is in short circuit, D1 is cut off, S1 voltage is changed into 0V, Q1 is cut off, Q2 is switched on, and current flows through the pre-opening loop;

when the LED _ Out returns to normal, the LED _ Out is not connected with the load or is connected with the LED, D1 is conducted again, and the main loop is conducted again.

Images