Circuit structure for controlling LED lamp and light-emitting device

Abstract

The utility model discloses a circuit structure used for controlling an LED lamp, the circuit structure comprises a boost module, a high voltage detection module and a control module, the output end of the boost module is connected with the input end of the high voltage detection module, the output end of the high voltage detection module is used for being connected with the LED lamp, and the control module is used for controlling the LED lamp. The control module is connected with the boosting module and is used for controlling the voltage output by the boosting module to be increased or decreased; the high-voltage detection module is used for connecting the input end of the high-voltage detection module and the output end of the high-voltage detection module when the voltage output by the boosting module is greater than a preset voltage; and the switching module is used for switching off the input end of the high-voltage detection module and the output end of the high-voltage detection module when the voltage output by the boosting module is smaller than the preset voltage. According to the scheme, the problem that the LED lamp is in a slight light state and cannot be completely extinguished in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the field of LED lamp control circuits, in particular to a circuit structure and a light-emitting device for controlling LED lamps. Background Art

[0002] In some conventional DC-DC topology output circuits, after the circuit is connected to an LED lamp and an external power supply is supplied, the LED lamp can be lit only after the voltage is boosted by the boost circuit structure in the circuit. When the LED lamp is in standby mode, the voltage is reduced by the boost circuit structure in the circuit to put the LED lamp in standby mode. However, after the boost circuit structure reduces the voltage, the LED lamp still has a relatively low input voltage, so that the LED lamp is slightly bright, and the LED lamp cannot be turned off. Utility Model Content

[0003] The utility model discloses a circuit structure and a light-emitting device for controlling an LED lamp, so as to solve the problem in the related art that the LED lamp is in a slightly bright state but cannot be completely extinguished.

[0004] In order to solve the above technical problems, the utility model is achieved as follows:

[0005] In a first aspect, the present application discloses a circuit structure for controlling an LED lamp, the circuit structure comprising a boost module, a high voltage detection module and a control module, the output end of the boost module is connected to the input end of the high voltage detection module, the output end of the high voltage detection module is used to connect to the LED lamp, the control module is connected to the boost module, and is used to control the voltage output by the boost module to increase or decrease;

[0006] The high-voltage detection module is used to connect the input end of the high-voltage detection module and the output end of the high-voltage detection module when the voltage output by the boost module is greater than a preset voltage, and to disconnect the input end of the high-voltage detection module and the output end of the high-voltage detection module when the voltage output by the boost module is less than the preset voltage.

[0007] Second aspect: The present application also discloses a light-emitting device, which includes an LED lamp and the circuit structure described in the first aspect, and the output end of the high-voltage detection module is connected to the LED lamp.

[0008] The technical solution adopted by the utility model can achieve the following technical effects:

[0009] The circuit structure disclosed in the embodiment of the present application is configured with a boost module, a high-voltage detection module and a control module, so that the output end of the boost module is connected to the input end of the high-voltage detection module, the output end of the high-voltage detection module is used to connect to an LED lamp, and the control module is connected to the boost module, so that when the input end of the boost module is connected to an external power supply to power the circuit structure, when the control module controls the voltage output of the boost module to be greater than a preset voltage, the input end of the high-voltage detection module is connected to the output end of the high-voltage detection module, so that the output end of the boost module is connected to the LED lamp through the high-voltage detection module, so that the LED lamp lights up; when the control module controls the voltage output of the boost module to be less than a preset voltage, the input end of the high-voltage detection module is disconnected from the output end of the high-voltage detection module, so that the output end of the boost module is disconnected from the LED lamp through the high-voltage detection module, so that the LED lamp is turned off. Since a high-voltage detection module is arranged between the output end of the boost module and the LED lamp, when the boost module keeps being connected to the external power supply and the output voltage of the boost module is less than the preset voltage, the high-voltage detection module is in a disconnected state so that the voltage of the external power supply cannot reach the LED lamp, thereby preventing the LED lamp from being dimly lit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is an overall schematic diagram of the circuit structure disclosed in an embodiment of the utility model, wherein VIN1 represents the voltage of the external power supply input to the circuit structure, VIN2 represents the preset voltage of the control power supply input, LED represents the LED light, GND represents the ground, and G around the PMOS tube and the NMOS tube represents the gate, D represents the drain, and S represents the source. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0012] The technical solutions disclosed in various embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0013] Please refer to Figure 1 The embodiment of the utility model discloses a circuit structure for controlling an LED lamp. The disclosed circuit structure includes a boost module A, a high voltage detection module B and a control module C.

[0014] The output end of the boost module A is connected to the input end of the high-voltage detection module B, the output end of the high-voltage detection module B is used to connect to the LED lamp, and the control module C is connected to the boost module to control the voltage output by the boost module A to increase or decrease.

[0015] The high-voltage detection module B is used to connect the input end of the high-voltage detection module B and the output end of the high-voltage detection module B when the voltage output by the boost module A is greater than the preset voltage, and to disconnect the input end of the high-voltage detection module B and the output end of the high-voltage detection module B when the voltage output by the boost module A is less than the preset voltage.

[0016] It should be noted that the circuit structure disclosed in the embodiment of the present application is based on the scenario that the voltage output by the external power supply is insufficient to make the LED lamp emit light normally (when the voltage of the external power supply is input to the LED lamp, the LED lamp is usually in an off state or in a dimly lit state, at this time, the LED lamp is in an abnormal light-emitting state), and the LED lamp needs to be boosted by the boost module A to make it emit light normally. Therefore, the preset voltage is usually greater than or equal to the input voltage of the external power supply. The on and off of the high-voltage detection module B is controlled by the voltage output by the boost module A, so that when the voltage output by the boost module A is greater than the preset voltage, the input end of the high-voltage detection module B is connected to the output end of the high-voltage detection module B, and when the voltage output by the boost module A is less than the preset voltage, the input end of the high-voltage detection module B is disconnected from the output end of the high-voltage detection module B.

[0017] That is to say, the high-voltage detection module B can automatically identify whether the boost module A is working normally to control the LED light to light up or go out, that is, when the voltage output by the boost module A is greater than the preset voltage, the high-voltage detection module B can automatically identify that the boost module A is in a boost state and connect the input end of the high-voltage detection module B with the output end of the high-voltage detection module B; when the voltage output by the boost module A is less than the preset voltage, the high-voltage detection module B can automatically identify that the boost module A is in a non-boosted state and disconnect the input end of the high-voltage detection module B from the output end of the high-voltage detection module B.

[0018] The circuit structure disclosed in the embodiment of the present application is provided with a boost module A, a high-voltage detection module B and a control module C, so that the output end of the boost module A is connected to the input end of the high-voltage detection module B, the output end of the high-voltage detection module B is used to connect to the LED lamp, and the control module C is connected to the boost module A, so that when the input end of the boost module A is connected to an external power supply to power the circuit structure, when the control module C controls the output voltage of the boost module A to be greater than a preset voltage, the input end of the high-voltage detection module B is connected to the output end of the high-voltage detection module B, so that the output end of the boost module A is connected to the LED lamp through the high-voltage detection module B, so that the LED lamp lights up; when the control module C controls the output voltage of the boost module A to be less than the preset voltage, the input end of the high-voltage detection module B is disconnected from the output end of the high-voltage detection module B, so that the output end of the boost module A is disconnected from the LED lamp through the high-voltage detection module B, so that the LED lamp is extinguished. Since a high-voltage detection module B is provided between the output end of the boost module A and the LED lamp, when the boost module A keeps being connected to an external power supply and the output voltage of the boost module A is less than a preset voltage, the high-voltage detection module B is in a disconnected state so that the voltage of the external power supply cannot reach the LED lamp, thereby preventing the LED lamp from being dimly lit.

[0019] It should be noted that the circuit structure disclosed in the embodiment of the present application can be applied to application scenarios where the circuit structure is always connected to an external power supply, and the lighting and extinguishing of an LED lamp can be controlled by controlling the voltage rise and fall of the boost module A through the control module C. For example, it can be applied to the control of fire lamps, the control of LED lighting lamps in remote locations, and other scenarios.

[0020] Optionally, the high-voltage detection module B may include a PMOS tube Q1. The output end of the boost module A may be connected to the source of the PMOS tube Q1, the drain of the PMOS tube Q1 may be used to connect to an LED lamp, and the gate of the PMOS tube Q1 may be used to connect to a control power supply. The output voltage of the control power supply is a preset voltage, the source of the PMOS tube Q1 is the input end of the high-voltage detection module B, and the drain of the PMOS tube Q1 is the output end of the high-voltage detection module.

[0021] The circuit structure disclosed in the embodiment of the present application is configured such that the output end of the boost module A is connected to the source of the PMOS tube Q1, the drain of the PMOS tube Q1 is connected to the LED lamp, and the gate of the PMOS tube Q1 is connected to the control power supply. By configuring the gate of the PMOS tube Q1 to be connected to the control power supply, when the output voltage of the boost module A controlled by the control module C is greater than the preset voltage, the voltage of the source of the PMOS tube Q1 is greater than the voltage of the gate of the PMOS tube, thereby making the source and drain of the PMOS tube Q1 conductive, and thus making the voltage delivered to the LED lamp to light up normally after being boosted by the boost module A; when the output voltage of the boost module A controlled by the control module C is less than the preset voltage, the voltage of the source of the PMOS tube Q1 is less than the voltage of the gate of the PMOS tube Q1, thereby making the source and drain of the PMOS tube Q1 disconnected, thereby making the path where the LED lamp is located disconnected, and the LED lamp is extinguished.

[0022] In order to avoid the voltage output by the control power supply being too large under abnormal conditions and thus damaging the PMOS tube Q1, optionally, the high-voltage detection module B may further include a first diode ZD1, the anode of the first diode ZD1 may be connected to the gate of the PMOS tube Q1, and the cathode of the first diode ZD1 may be connected to the source of the PMOS tube Q1, that is, the first diode ZD1 is connected in parallel to the gate of the PMOS tube Q1 and the source of the PMOS tube Q1. The conduction voltage of the first diode ZD1 is greater than the preset voltage.

[0023] It should be noted that, although the on-voltage of the first diode ZD1 is greater than the preset voltage, the on-voltage of the first diode ZD1 cannot be greater than the protection voltage of the PMOS tube Q1 when it is designed. For example, the on-voltage of the first diode ZD1 may be 10V, the preset voltage may be 8V, and the protection voltage of the PMOS tube Q1 may be 11V. Of course, the on-voltage of the first diode ZD1, the preset voltage, and the protection voltage of the PMOS tube Q1 may also be other values, and the embodiments of the present application do not impose specific limitations thereon.

[0024] The circuit structure disclosed in the embodiment of the present application sets a first diode ZD1 so that when the voltage output by the control power supply is too large (usually greater than a preset voltage) under abnormal circumstances, the first diode ZD1 is turned on, thereby avoiding damage to the PMOS tube Q1 caused by the excessive voltage output by the control power supply.

[0025] In order to further protect the PMOS tube Q1, optionally, the high voltage detection module B may further include a first resistor R2, which may be connected in series with the gate of the PMOS tube Q1, thereby limiting the current flowing through the PMOS tube Q1, thereby protecting the PMOS tube Q1.

[0026] In an optional embodiment, the boost module A may include an NMOS tube Q2, an inductor L1 and a first capacitor EC2. The input end of the inductor L1 may be used to connect to an external power supply, the positive electrode of the first capacitor EC2, the drain of the NMOS tube Q2 and the source of the PMOS tube Q1 may be connected in parallel to the output end of the inductor L1, the negative electrode of the first capacitor EC2 and the source of the NMOS tube Q2 may be grounded, and the control module C may be connected to the gate of the NMOS tube Q2, wherein the input end of the inductor L1 may be the input end of the boost module A, and the positive electrode of the first capacitor EC2 may be the output end of the boost module A.

[0027] In a specific implementation process, since the source of the NMOS tube Q2 is connected to the ground, when the control module C outputs a small voltage to the gate of the NMOS tube Q2, the drain of the NMOS tube Q2 and the source of the NOMS tube Q2 are turned on. When the control module C alternately outputs a high level and a low level to the gate of the NMOS tube Q2, the drain of the NMOS tube Q2 and the source of the NOMS tube Q2 will alternately switch between connection and disconnection, thereby realizing the boost function of the boost module A under the action of the first capacitor EC2 and the inductor L1. When the control module C has no output to the gate of the NMOS tube Q2, the drain of the NMOS tube Q2 and the source of the NOMS tube Q2 are in a disconnected state, so that the boost module A is in a non-boosted state.

[0028] The circuit structure disclosed in the embodiment of the present application is configured such that the source of the NMOS tube Q2 is connected to the ground, and the control module C is connected to the gate of the NMOS tube Q2. When the control module C outputs a small voltage to the gate of the NMOS tube Q2, the drain of the NMOS tube Q2 and the source of the NMOS tube Q2 can be turned on, thereby facilitating energy saving of the circuit structure.

[0029] Optionally, the boost module A may further include a second diode D1, which may be connected in series between the drain of the NMOS tube Q2 and the anode of the first capacitor EC2, and the anode of the second diode D1 may be connected to the drain of the NMOS tube, and the cathode of the second diode D1 may be connected to the anode of the first capacitor EC2.

[0030] The circuit structure disclosed in the embodiment of the present application sets a second diode D1 so that the second diode D1 is connected in series between the drain of the NMOS tube Q2 and the anode of the first capacitor EC2, and the anode of the second diode D1 is connected to the drain of the NMOS tube Q2, and the cathode of the second diode D1 is connected to the anode of the first capacitor EC2, thereby preventing the voltage output by the first capacitor EC2 from breaking through the NMOS tube Q2 and causing damage to the NMOS tube Q2 when the drain of the NMOS tube Q2 and the source of the NMOS tube Q2 are disconnected.

[0031] In order to avoid the problem of complicated circuit structure caused by the difference between the voltage output by the external power supply and the voltage output by the control power supply, optionally, the first voltage output by the external power supply can be equal to the preset voltage. Since the second diode D1 has a certain voltage drop, the first voltage output by the external power supply will be less than the preset voltage output by the control power supply after being stepped down by the second diode D1, thereby unifying the voltage output by the external power supply and the voltage output by the control power supply, which is conducive to simplifying the selection of power supplies and optimizing the circuit structure.

[0032] In order to avoid the situation where the gate of the NMOS tube Q2 has an induced current and the drain of the NMOS tube Q2 and the source of the NMOS tube Q2 are turned on when the control module C has no output to the gate of the NMOS tube Q2, the boost module A may optionally further include a second resistor R1, a first end of the second resistor R1 may be connected to the gate of the NMOS tube Q2, and a second end of the second resistor R1 may be connected to the ground, so that when the control module C has no output to the gate of the NMOS tube Q2, the gate of the NMOS tube Q2 is always grounded, thereby avoiding the situation where the drain of the NMOS tube Q2 and the source of the NMOS tube Q2 are turned on due to the induced current.

[0033] Optionally, the control module may include a pulse width modulation device, thereby facilitating improving the control capability of the circuit structure.

[0034] Optionally, the circuit structure may further include a second capacitor EC1, which is used to be connected to an external power source, a positive electrode of the second capacitor EC1 may be connected to an input end of the boost module A, and a negative electrode of the second capacitor EC1 is used to be connected to an LED lamp.

[0035] The circuit structure disclosed in the embodiment of the present application sets a second capacitor EC1 so that the positive electrode of the second capacitor EC1 is connected to the input end of the boost module A, and the negative electrode of the second capacitor EC1 is used to connect to the LED lamp, so that the second capacitor EC1 stabilizes the input voltage of the entire circuit to the external power supply.

[0036] The present application discloses a specific implementation manner, in which the positive electrode of the second capacitor EC1 and the input end of the inductor L1 are connected in parallel to an external power supply, the positive electrode of the second diode D1 and the drain of the NMOS tube Q2 are connected in parallel to the output end of the inductor L1, the control module C and the first end of the second resistor R1 can be connected in parallel to the gate of the NMOS tube Q2, the positive electrode of the first capacitor EC2, the source of the PMOS tube Q1 and the negative electrode of the first diode ZD1 are connected in parallel to the negative electrode of the second diode D1, the drain of the PMOS tube Q1 is used to be connected to an LED lamp, the gate of the PMOS tube Q1 and the positive electrode of the first diode ZD1 are connected in parallel to the first end of the first resistor R2, the second end of the first resistor R2 is connected to the control power supply, the LED lamp, the negative electrode of the first capacitor EC2, the source of the NMOS tube Q2 and the second end of the second resistor R1 are all connected in parallel to the negative electrode of the second capacitor EC1, and can all be grounded.

[0037] It should be noted that in the application embodiment, the types of the boost module A and the high-voltage detection module B can also be other structures, all of which belong to the prior art and will not be specifically introduced in the embodiment of the present application.

[0038] The present application also discloses a light-emitting device, which includes an LED lamp and the circuit structure disclosed in the above embodiment, and the output end of the high-voltage detection module is connected to the LED lamp.

[0039] The light-emitting device disclosed in the embodiment of the present application is provided with the circuit structure disclosed in the above embodiment, so that when the input end of the boost module A is connected to the external power supply to supply power to the circuit structure, when the control module C controls the output voltage of the boost module A to be greater than the preset voltage, the input end of the high-voltage detection module B is connected to the output end of the high-voltage detection module B, so that the output end of the boost module A is connected to the LED lamp through the high-voltage detection module B, so that the LED lamp is lit; when the control module C controls the output voltage of the boost module A to be less than the preset voltage, the input end of the high-voltage detection module B is disconnected from the output end of the high-voltage detection module B, so that the output end of the boost module A is disconnected from the LED lamp through the high-voltage detection module B, so that the LED lamp is turned off. Since the high-voltage detection module B is provided between the output end of the boost module A and the LED lamp, when the boost module A remains connected to the external power supply and the output voltage of the boost module A is less than the preset voltage, the high-voltage detection module B is in a disconnected state so that the voltage of the external power supply cannot reach the LED lamp, thereby not causing the LED lamp to be slightly bright.

[0040] In the embodiment of the present application, there may be one LED lamp or multiple LED lamps. When there are multiple LED lamps, the multiple LED lamps form a lamp group, and the circuit structure controls the entire lamp group.

[0041] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0042] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A circuit structure for controlling an LED lamp, characterized in that: The circuit structure comprises a boost module (A), a high voltage detection module (B) and a control module (C), wherein the output end of the boost module (A) is connected to the input end of the high voltage detection module (B), the output end of the high voltage detection module (B) is used to be connected to the LED lamp, and the control module (C) is connected to the boost module (A) and is used to control the voltage output by the boost module (A) to increase or decrease; The high-voltage detection module (B) is used to connect the input end of the high-voltage detection module (B) and the output end of the high-voltage detection module (B) when the voltage output by the boost module (A) is greater than a preset voltage, and to disconnect the input end of the high-voltage detection module (B) and the output end of the high-voltage detection module (B) when the voltage output by the boost module (A) is less than the preset voltage.

2. The circuit structure according to claim 1, characterized in that: The high-voltage detection module (B) comprises a PMOS tube (Q1), the output end of the boost module (A) is connected to the source of the PMOS tube (Q1), the drain of the PMOS tube (Q1) is used to be connected to the LED lamp, and the gate of the PMOS tube (Q1) is used to be connected to a control power supply, wherein the output voltage of the control power supply is the preset voltage, the source of the PMOS tube (Q1) is the input end of the high-voltage detection module (B), and the drain of the PMOS tube (Q1) is the output end of the high-voltage detection module (B).

3. The circuit structure according to claim 2, characterized in that: The high-voltage detection module (B) further comprises a first diode (ZD1), an anode of the first diode (ZD1) being connected to the gate of the PMOS tube (Q1), and a cathode of the first diode (ZD1) being connected to the source of the PMOS tube (Q1), wherein a conduction voltage of the first diode (ZD1) is greater than the preset voltage.

4. The circuit structure according to claim 2, characterized in that: The high-voltage detection module (B) further comprises a first resistor (R2), wherein the first resistor (R2) is connected in series with the gate of the PMOS tube (Q1).

5. The circuit structure according to claim 2, characterized in that: The boost module (A) comprises an NMOS tube (Q2), an inductor (L1) and a first capacitor (EC2); the input end of the inductor (L1) is used to connect to an external power supply; the positive electrode of the first capacitor (EC2), the drain electrode of the NMOS tube (Q2) and the source electrode of the PMOS tube (Q1) are connected to the output end of the inductor (L1); the negative electrode of the first capacitor (EC2) and the source electrode of the NMOS tube (Q2) are both grounded; the control module (C) is connected to the gate electrode of the NMOS tube (Q2); the input end of the inductor (L1) is the input end of the boost module (A); and the positive electrode of the first capacitor (EC2) is the output end of the boost module (A).

6. The circuit structure according to claim 5, characterized in that: The boost module (A) further includes a second diode (D1), which is connected in series between the drain of the NMOS tube (Q2) and the positive electrode of the first capacitor (EC2), and the positive electrode of the second diode (D1) is connected to the drain of the NMOS tube (Q2), and the negative electrode of the second diode (D1) is connected to the positive electrode of the first capacitor (EC2).

7. The circuit structure according to claim 6, characterized in that: The first voltage output by the external power supply is equal to the preset voltage.

8. The circuit structure according to claim 5, characterized in that: The boost module (A) further comprises a second resistor (R1), a first end of the second resistor (R1) being connected to the gate of the NMOS tube (Q2), and a second end of the second resistor (R1) being connected to the ground.

9. The circuit structure according to claim 1, characterized in that: The circuit structure also includes a second capacitor (EC1), the second capacitor (EC1) is used to be connected to an external power supply, the positive electrode of the second capacitor (EC1) is connected to the input end of the boost module (A), and the negative electrode of the second capacitor (EC1) is used to be connected to the LED lamp.

10. A light emitting device, characterized in that: It comprises an LED lamp and the circuit structure according to any one of claims 1 to 9, wherein the output end of the high-voltage detection module (B) is connected to the LED lamp.

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