CN201682279U - Power-source anti-reverse-connection circuit, LED lamp circuit and LED lamp - Google Patents

Abstract

The utility model is suitable for the field of an LED lamp, providing a power-source anti-reverse-connection circuit, an LED lamp circuit and an LED lamp. The power-source anti-reverse-connection circuit comprises a switch module and a voltage offset module, and a MOS tube is used as the switch module. When a power source is reversely connected, the voltage offset module controls the MOS tube to turn off the power path of the LED lamp circuit, and therefore a role of power-source anti-reverse-connection is played. As the inner resistance of the MOS tube is small and voltage drop is low, the power dissipation is low.

Description

Power supply anti-reverse connection circuit, LED lamp circuit and LED lamp

technical field

The utility model belongs to the field of LED lamps, in particular to a power supply anti-reverse connection circuit, an LED lamp circuit and an LED lamp.

Background technique

In electronic equipment using an external power supply, if the power supply of the electronic equipment is reversed, it will cause permanent damage to the electronic equipment.

The current anti-reverse connection circuit of the power supply uses a diode, and uses the unidirectional conduction characteristic of the diode to prevent the reverse connection of the power supply from damaging the electronic equipment. However, since the voltage drop of the diode is fixed, it consumes too much power and generates heat, which reduces the stability of the circuit.

Utility model content

The purpose of the utility model is to provide a power supply anti-reverse connection circuit, aiming at solving the problem of large power consumption of diodes in the existing power supply anti-reverse connection circuit.

The utility model is achieved in this way, a power supply anti-reverse connection circuit, the power supply anti-reverse connection circuit includes:

a switch module;

When the power supply is reversed, control the switch module to turn off the voltage bias module of the power path of the LED lamp circuit;

The input terminal of the voltage bias module is connected to the positive pole of the power supply, the first output terminal and the second output terminal of the voltage bias module are respectively connected to the input terminal and the control terminal of the switch module, and the first output terminal of the voltage bias module is connected to the control terminal of the switch module. The three output terminals are connected to the negative source of the LED lamp circuit, and the output terminal of the switch module is connected to the positive source of the LED lamp circuit;

The switch module uses a MOS transistor Q3, the source of the MOS transistor Q3 is used as the input end of the switch module, the drain of the MOS transistor Q3 is used as the output end of the switch module, and the gate of the MOS transistor Q3 is used as the switch module the control terminal.

In the above structure, the voltage bias module includes:

The first switching element, the second switching element, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3, the voltage dividing resistor R4, the voltage dividing resistor R5 and the voltage dividing resistor R6;

The first terminal of the first switching element is used as the input terminal of the voltage bias module to connect to the positive pole of the power supply, and the second terminal of the first switch element is used as the first output terminal of the voltage bias module to connect to the switch The input terminal of the module, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3 and the voltage dividing resistor R4 are sequentially connected in series, and the common connection terminal of the voltage dividing resistor R1 and the voltage dividing resistor R2 is connected to the first The control terminal of the switch element, the other end of the voltage dividing resistor R1 is grounded, the common connection terminal of the voltage dividing resistor R2 and the voltage dividing resistor R3 is connected to the second end of the first switching element, and the voltage dividing resistor R3 The common connection end of the voltage dividing resistor R4 is used as the second output terminal of the voltage bias module to connect to the control terminal of the switch module, and the other end of the voltage dividing resistor R4 is connected to the first end of the second switching element , the second terminal of the second switching element is grounded, the control terminal of the second switching element is grounded through the voltage dividing resistor R6, and the common connection terminal of the control terminal of the second switching element and the voltage dividing resistor R6 is connected to the voltage dividing The first terminal of the resistor R5 and the second terminal of the voltage dividing resistor R5 are connected to the negative source of the LED lamp circuit as the third output terminal of the voltage bias module.

In the above structure, the first switching element adopts a MOS transistor Q1, the drain of the MOS transistor Q1 is used as the first end of the first switching element, and the source of the MOS transistor Q1 is used as the second end of the first switching element , the gate of the MOS transistor Q1 serves as the control terminal of the first switching element.

In the above structure, the second switching element adopts a triode Q2, the collector of the triode Q2 serves as the first end of the second switching element, and the emitter of the triode Q2 serves as the second end of the second switching element. The base of the transistor Q2 serves as the control terminal of the second switching element.

Another object of the present utility model is to provide an LED lamp circuit, the LED lamp circuit includes a power supply anti-reverse connection circuit, and the power supply anti-reverse connection circuit includes:

a switch module;

When the power supply is reversed, control the switch module to turn off the voltage bias module of the power path of the LED lamp circuit;

The input terminal of the voltage bias module is connected to the positive pole of the power supply, the first output terminal and the second output terminal of the voltage bias module are respectively connected to the input terminal and the control terminal of the switch module, and the first output terminal of the voltage bias module is connected to the control terminal of the switch module. The three output terminals are connected to the negative source of the LED lamp circuit, and the output terminal of the switch module is connected to the positive source of the LED lamp circuit;

The switch module uses a MOS transistor Q3, the source of the MOS transistor Q3 is used as the input end of the switch module, the drain of the MOS transistor Q3 is used as the output end of the switch module, and the gate of the MOS transistor Q3 is used as the switch module the control terminal.

In the above structure, the voltage bias module includes:

The first switching element, the second switching element, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3, the voltage dividing resistor R4, the voltage dividing resistor R5 and the voltage dividing resistor R6;

The first terminal of the first switching element is used as the input terminal of the voltage bias module to connect to the positive pole of the power supply, and the second terminal of the first switch element is used as the first output terminal of the voltage bias module to connect to the switch The input terminal of the module, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3 and the voltage dividing resistor R4 are sequentially connected in series, and the common connection terminal of the voltage dividing resistor R1 and the voltage dividing resistor R2 is connected to the first The control terminal of the switch element, the other end of the voltage dividing resistor R1 is grounded, the common connection terminal of the voltage dividing resistor R2 and the voltage dividing resistor R3 is connected to the second end of the first switching element, and the voltage dividing resistor R3 The common connection end of the voltage dividing resistor R4 is used as the second output terminal of the voltage bias module to connect to the control terminal of the switch module, and the other end of the voltage dividing resistor R4 is connected to the first end of the second switching element , the second terminal of the second switching element is grounded, the control terminal of the second switching element is grounded through the voltage dividing resistor R6, and the common connection terminal of the control terminal of the second switching element and the voltage dividing resistor R6 is connected to the voltage dividing The first terminal of the resistor R5 and the second terminal of the voltage dividing resistor R5 are connected to the negative source of the LED lamp circuit as the third output terminal of the voltage bias module.

In the above structure, the first switching element adopts a MOS transistor Q1, the drain of the MOS transistor Q1 is used as the first end of the first switching element, and the source of the MOS transistor Q1 is used as the second end of the first switching element , the gate of the MOS transistor Q1 serves as the control terminal of the first switching element.

In the above structure, the second switching element adopts a triode Q2, the collector of the triode Q2 serves as the first end of the second switching element, and the emitter of the triode Q2 serves as the second end of the second switching element. The base of the transistor Q2 serves as the control terminal of the second switching element.

Another object of the present utility model is to provide an LED lamp comprising the above-mentioned LED lamp circuit.

In the utility model, the power supply anti-reverse circuit includes a switch module and a voltage bias module, and a MOS tube is used as the switch module. When the power supply is reversed, the voltage bias module controls the MOS tube to turn off the power path of the LED lamp circuit , so as to play the role of anti-reverse connection of the power supply, and because the internal resistance of the MOS tube is small and the voltage drop is small, its power consumption is small.

Description of drawings

Fig. 1 is a structural diagram of a power supply anti-reverse connection circuit provided by an embodiment of the present invention;

Fig. 2 is an example circuit diagram of the anti-reverse connection circuit of the power supply provided by the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In the embodiment of the utility model, the power supply anti-reverse circuit includes a switch module and a voltage bias module, and a MOS tube is used as the switch module. When the power supply is reversed, the voltage bias module controls the MOS tube to turn off the power supply of the LED lamp circuit The channel, thus playing the role of anti-reverse connection of the power supply, and because the internal resistance of the MOS tube is small, the voltage drop is small, so its power consumption is small.

Fig. 1 shows the structure of the anti-reverse connection circuit of the power supply provided by the embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown.

The power supply anti-reverse connection circuit includes a switch module 100 and a voltage bias module 200;

The input terminal of the voltage bias module 200 is connected to the positive pole of the power supply, the first output terminal and the second output terminal of the voltage bias module 200 are respectively connected to the input terminal and the control terminal of the switch module 100, and the third output terminal of the voltage bias module 200 is connected to The negative source of the LED lamp circuit, the output terminal of the switch module 100 is connected to the positive source of the LED lamp circuit;

The voltage bias module 200 is used to control the switch module 100 to cut off the power path of the LED lamp circuit when the power supply is reversed.

Fig. 2 shows an example circuit structure of the power supply anti-reverse connection circuit provided by the embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown.

As an embodiment of the present utility model, the switch module 100 uses a MOS transistor Q3, the source of the MOS transistor Q3 is used as the input terminal of the switch module 100, the drain of the MOS transistor Q3 is used as the output terminal of the switch module 100, and the gate of the MOS transistor Q3 is As the control terminal of the switch module 100.

As an embodiment of the present invention, the voltage bias module 200 includes:

The first switching element 201, the second switching element 202, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3, the voltage dividing resistor R4, the voltage dividing resistor R5 and the voltage dividing resistor R6;

The first terminal of the first switch element 201 is used as the input terminal of the voltage bias module 200 and connected to the positive pole of the power supply, and the second terminal of the first switch element 201 is connected to the input terminal of the switch module 100 as the first output terminal of the voltage bias module 200, The voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3 and the voltage dividing resistor R4 are sequentially connected in series, the common connection terminal of the voltage dividing resistor R1 and the voltage dividing resistor R2 is connected to the control terminal of the first switch element 201, and the voltage dividing resistor R1 The other end of the voltage dividing resistor R2 and the voltage dividing resistor R3 are connected to the second end of the first switch element 201, and the common connection end of the voltage dividing resistor R3 and the voltage dividing resistor R4 is used as the second end of the voltage biasing module 200. The two output ends are connected to the control end of the switch module 100, the other end of the voltage dividing resistor R4 is connected to the first end of the second switch element 202, the second end of the second switch element 202 is grounded, and the control end of the second switch element 202 is passed through the divider. The piezoresistor R6 is grounded, the common connection between the control terminal of the second switch element 202 and the voltage dividing resistor R6 is connected to the first end of the voltage dividing resistor R5, and the second end of the voltage dividing resistor R5 is used as the third output of the voltage bias module 200 Terminate the negative source of the LED lamp circuit.

As an embodiment of the present invention, the first switching element 201 adopts a MOS transistor Q1, the drain of the MOS transistor Q1 is used as the first end of the first switching element 201, and the source of the MOS transistor Q1 is used as the second terminal of the first switching element 201. terminal, and the gate of the MOS transistor Q1 serves as the control terminal of the first switching element 201 .

As an embodiment of the present invention, the second switching element 202 adopts a triode Q2, the collector of the triode Q2 is used as the first end of the second switching element 202, and the emitter of the triode Q2 is used as the second end of the second switching element 202. The triode The base of Q2 serves as the control terminal of the second switching element 202 .

The embodiment of the utility model also provides an LED lamp circuit including the above-mentioned anti-reverse connection circuit of the power supply.

The embodiment of the utility model also provides an LED lamp comprising the above-mentioned LED lamp circuit.

The working principle of the power supply anti-reverse connection circuit is:

When the power supply is normally connected, the voltage bias module 200 provides a forward bias voltage between the gate and the source of the MOS transistor Q3, the MOS transistor Q3 is turned on, and there is current between the drain and the source of the MOS transistor Q3 Pass, the power path of the LED lamp circuit is turned on, and the LED lamp works normally;

When the power supply is reversed, the voltage bias module 200 provides a reverse bias voltage between the gate and the source of the MOS transistor Q3, the MOS transistor Q3 is not turned on, and there is no current between the drain and the source of the MOS transistor Q3 By passing through, the power path of the LED lamp circuit is disconnected, preventing the LED lamp from being damaged.

In the embodiment of the present invention, the power supply anti-reverse connection circuit includes a switch module and a voltage bias module, and a MOS tube is used as the switch module. When the power supply is reversed, the voltage bias module controls the MOS tube to turn off the LED lamp circuit. The power supply path plays the role of preventing reverse connection of the power supply, and because the internal resistance of the MOS tube is small, the voltage drop is small, so its power consumption is small.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. A power supply anti-reverse connection circuit, characterized in that, the power supply anti-reverse connection circuit comprises: a switch module; When the power supply is reversed, control the switch module to turn off the voltage bias module of the power path of the LED lamp circuit; The input terminal of the voltage bias module is connected to the positive pole of the power supply, the first output terminal and the second output terminal of the voltage bias module are respectively connected to the input terminal and the control terminal of the switch module, and the first output terminal of the voltage bias module is connected to the control terminal of the switch module. The three output terminals are connected to the negative source of the LED lamp circuit, and the output terminal of the switch module is connected to the positive source of the LED lamp circuit; The switch module uses a MOS transistor Q3, the source of the MOS transistor Q3 is used as the input end of the switch module, the drain of the MOS transistor Q3 is used as the output end of the switch module, and the gate of the MOS transistor Q3 is used as the switch module the control terminal. 2. The power supply anti-reverse connection circuit according to claim 1, wherein the voltage bias module comprises: The first switching element, the second switching element, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3, the voltage dividing resistor R4, the voltage dividing resistor R5 and the voltage dividing resistor R6; The first terminal of the first switching element is used as the input terminal of the voltage bias module to connect to the positive pole of the power supply, and the second terminal of the first switch element is used as the first output terminal of the voltage bias module to connect to the switch The input terminal of the module, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3 and the voltage dividing resistor R4 are sequentially connected in series, and the common connection terminal of the voltage dividing resistor R1 and the voltage dividing resistor R2 is connected to the first The control terminal of the switch element, the other end of the voltage dividing resistor R1 is grounded, the common connection terminal of the voltage dividing resistor R2 and the voltage dividing resistor R3 is connected to the second end of the first switching element, and the voltage dividing resistor R3 The common connection end of the voltage dividing resistor R4 is used as the second output terminal of the voltage bias module to connect to the control terminal of the switch module, and the other end of the voltage dividing resistor R4 is connected to the first end of the second switching element , the second terminal of the second switching element is grounded, the control terminal of the second switching element is grounded through the voltage dividing resistor R6, and the common connection terminal of the control terminal of the second switching element and the voltage dividing resistor R6 is connected to the voltage dividing The first terminal of the resistor R5 and the second terminal of the voltage dividing resistor R5 are connected to the negative source of the LED lamp circuit as the third output terminal of the voltage bias module. 3. The power supply anti-reverse connection circuit according to claim 2, characterized in that, the first switching element adopts a MOS transistor Q1, and the drain of the MOS transistor Q1 serves as the first end of the first switching element, and the The source of the MOS transistor Q1 is used as the second terminal of the first switch element, and the gate of the MOS transistor Q1 is used as the control terminal of the first switch element. 4. The power supply anti-reverse connection circuit according to claim 2, wherein the second switching element adopts a triode Q2, the collector of the triode Q2 serves as the first end of the second switching element, and the triode Q2 The emitter of the transistor Q2 is used as the second terminal of the second switching element, and the base of the transistor Q2 is used as the control terminal of the second switching element. 5. An LED lamp circuit, characterized in that the LED lamp circuit includes a power supply anti-reverse connection circuit, and the power supply anti-reverse connection circuit includes: a switch module; When the power supply is reversed, control the switch module to turn off the voltage bias module of the power path of the LED lamp circuit; The input terminal of the voltage bias module is connected to the positive pole of the power supply, the first output terminal and the second output terminal of the voltage bias module are respectively connected to the input terminal and the control terminal of the switch module, and the first output terminal of the voltage bias module is connected to the control terminal of the switch module. The three output terminals are connected to the negative source of the LED lamp circuit, and the output terminal of the switch module is connected to the positive source of the LED lamp circuit; The switch module uses a MOS transistor Q3, the source of the MOS transistor Q3 is used as the input end of the switch module, the drain of the MOS transistor Q3 is used as the output end of the switch module, and the gate of the MOS transistor Q3 is used as the switch module the control terminal. 6. The LED lamp circuit according to claim 5, wherein the voltage bias module comprises: The first switching element, the second switching element, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3, the voltage dividing resistor R4, the voltage dividing resistor R5 and the voltage dividing resistor R6; The first terminal of the first switching element is used as the input terminal of the voltage bias module to connect to the positive pole of the power supply, and the second terminal of the first switch element is used as the first output terminal of the voltage bias module to connect to the switch The input terminal of the module, the voltage dividing resistor R1, the voltage dividing resistor R2, the voltage dividing resistor R3 and the voltage dividing resistor R4 are sequentially connected in series, and the common connection terminal of the voltage dividing resistor R1 and the voltage dividing resistor R2 is connected to the first The control terminal of the switch element, the other end of the voltage dividing resistor R1 is grounded, the common connection terminal of the voltage dividing resistor R2 and the voltage dividing resistor R3 is connected to the second end of the first switching element, and the voltage dividing resistor R3 The common connection end of the voltage dividing resistor R4 is used as the second output terminal of the voltage bias module to connect to the control terminal of the switch module, and the other end of the voltage dividing resistor R4 is connected to the first end of the second switching element , the second terminal of the second switching element is grounded, the control terminal of the second switching element is grounded through the voltage dividing resistor R6, and the common connection terminal of the control terminal of the second switching element and the voltage dividing resistor R6 is connected to the voltage dividing The first terminal of the resistor R5 and the second terminal of the voltage dividing resistor R5 are connected to the negative source of the LED lamp circuit as the third output terminal of the voltage bias module. 7. The LED lamp circuit according to claim 6, wherein the first switching element adopts a MOS transistor Q1, the drain of the MOS transistor Q1 serves as the first end of the first switching element, and the MOS transistor The source of Q1 serves as the second terminal of the first switch element, and the gate of the MOS transistor Q1 serves as the control terminal of the first switch element. 8. The LED lamp circuit according to claim 6, wherein the second switching element is a triode Q2, the collector of the triode Q2 serves as the first end of the second switching element, and the emitter of the triode Q2 The pole serves as the second end of the second switch element, and the base of the triode Q2 serves as the control end of the second switch element. 9. An LED lamp, characterized in that the LED lamp comprises the LED lamp circuit according to any one of claims 5-8.

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