Boost type LED drive circuit

Abstract

The utility model discloses a boost type LED driving circuit, which relates to the field of LED driving, and comprises a low-voltage adjusting module, a voltage amplification module, a low-voltage output module, a low-voltage output module, a low-voltage output module, a low-voltage output module, a low-voltage output module, a low-voltage output module and a low-voltage output module, the conduction control module is used for controlling the voltage amplification module to carry out direct-current and alternating-current conversion; the voltage amplification module is used for converting the input voltage into alternating current, amplifying the alternating current and then outputting the alternating current to the rectification output module; the rectification output module is used for converting the alternating current into direct current and supplying power to the LED; the high-power LED driving circuit has the advantages that the high-power LED driving circuit amplifies the driving voltage of a high-power LED, and the low-voltage adjusting module is arranged for the voltage before amplification, so that the voltage can be conveniently adjusted when the voltage is low; direct adjustment of large voltage is avoided, and higher safety is achieved.

Description

Technical Field

[0001] The utility model relates to the field of LED driving, in particular to a boost-type LED driving circuit. Background Art

[0002] In the field of lighting, as the most critical component of semiconductor lighting, LEDs are popular in the market. The driving circuit is an important part of LED (light-emitting diode) products. Whether in the fields of lighting, backlight, or display panels, the selection of the driving circuit technical architecture should match the specific application.

[0003] For high-power LEDs, when adjusting the voltage, it is often based on a large voltage. When there is damage at the voltage regulation point, the voltage regulation is not safe enough and needs to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a boost-type LED driving circuit to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A boost-type LED driving circuit includes:

[0007] A low-voltage regulation module, which is used to provide voltage for the voltage amplification module and can adjust the magnitude of the output voltage to the voltage amplification module;

[0008] A conduction control module, which is used to control the voltage amplification module to perform direct and alternating current conversion;

[0009] A voltage amplification module, which is used to convert the input voltage into alternating current, amplify the alternating current and then output it to the rectification output module;

[0010] A rectification output module, which is used to convert the alternating current into direct current to supply power to the LED;

[0011] The low-voltage regulation module is connected to the voltage amplification module, the conduction control module is connected to the voltage amplification module, and the voltage amplification module is connected to the rectification output module.

[0012] As a further scheme of the utility model: The low-voltage regulation module includes a resistor R1, a potentiometer RP1, a MOS transistor V1, and a capacitor C1. One end of the resistor R1 is connected to the D pole of the MOS transistor V1 and the voltage VDD. The other end of the resistor R1 is connected to one end of the potentiometer RP1, one end of the capacitor C1, and the G pole of the MOS transistor V1. The other end of the potentiometer RP1 is grounded, and the other end of the capacitor C1 is grounded. The S pole of the MOS transistor V1 outputs the voltage VCC.

[0013] As a further solution of the utility model: The conduction control module includes an inverter U1, an inverter U2, a resistor R2, a potentiometer RP2, and a capacitor C2. The input end of the inverter U1 is connected to one end of the potentiometer RP2 and one end of the capacitor C2. The output end of the inverter U1 is connected to one end of the resistor R2, the input end of the inverter U2, and the voltage amplification module. The other end of the resistor R2 is connected to the other end of the potentiometer RP2. The output end of the inverter U2 is connected to the other end of the capacitor C2 and the voltage amplification module.

[0014] As a further solution of the utility model: The voltage amplification module includes a transformer W, an MOS transistor V3, and an MOS transistor V2. The first end of the input end of the transformer W is connected to the D pole of the MOS transistor V3. The second end of the input end of the transformer W introduces the voltage VCC. The third end of the input end of the transformer W is connected to the D pole of the MOS transistor V2. The S pole of the MOS transistor V2 is grounded. The S pole of the MOS transistor V3 is grounded. The G pole of the MOS transistor V2 is connected to one end of a resistor R3 and one end of a resistor R4. The other end of the resistor R3 is connected to the conduction control module. The other end of the resistor R4 is grounded. The G pole of the MOS transistor V3 is connected to one end of a resistor R5 and one end of a resistor R6. The other end of the resistor R6 is grounded. The other end of the resistor R5 is connected to the conduction control module. The output end of the transformer W is connected to the rectification output module.

[0015] As a further solution of the utility model: The rectification output module includes a rectifier T, a capacitor C3, a capacitor C4, and an inductor L1. The first end and the third end of the rectifier T are connected to the voltage amplification module. The second end of the rectifier T is grounded. The fourth end of the rectifier T is connected to one end of the capacitor C3 and one end of the inductor L1. The other end of the capacitor C3 is grounded. The other end of the inductor L1 is connected to one end of the capacitor C4. The other end of the capacitor C4 is grounded.

[0016] Compared with the prior art, the beneficial effect of the utility model is that the utility model amplifies the driving voltage of the high-power LED, and sets a low-voltage adjustment module for the voltage before amplification, which is convenient for adjusting the voltage magnitude at low voltage, avoids directly adjusting the large voltage, and is safer. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a boost-type LED driving circuit.

[0018] Figure 2 It is a circuit diagram of the low-voltage adjustment module.

[0019] Figure 3 It is a circuit diagram of the voltage amplification module, the conduction control module, and the rectification output module. Detailed Embodiment

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figure 1 , a boost-type LED driving circuit, comprising:

[0022] A low-voltage regulation module, configured to provide a voltage for the voltage amplification module and adjust the magnitude of the voltage output to the voltage amplification module;

[0023] A conduction control module, configured to control the voltage amplification module to perform direct and alternating current conversion;

[0024] A voltage amplification module, configured to convert the input voltage into an alternating current, amplify the alternating current and output it to the rectification output module;

[0025] A rectification output module, configured to convert the alternating current into a direct current to supply power to the LED;

[0026] The low-voltage regulation module is connected to the voltage amplification module, the conduction control module is connected to the voltage amplification module, and the voltage amplification module is connected to the rectification output module.

[0027] In this embodiment: Please refer to Figure 2 , the low-voltage regulation module includes a resistor R1, a potentiometer RP1, a MOS transistor V1, and a capacitor C1. One end of the resistor R1 is connected to the D pole of the MOS transistor V1 and the voltage VDD, and the other end of the resistor R1 is connected to one end of the potentiometer RP1, one end of the capacitor C1, and the G pole of the MOS transistor V1. The other end of the potentiometer RP1 is grounded, and the other end of the capacitor C1 is grounded. The S pole of the MOS transistor V1 outputs the voltage VCC.

[0028] After the voltage VDD is input, the capacitor C1 is charged through the resistor R1. The magnitude of the voltage on the capacitor C1 depends on the resistance value of the potentiometer RP1. Therefore, by adjusting the resistance value of the potentiometer RP1, the magnitude of the voltage on the capacitor C1 is controlled, the conduction degree of the MOS transistor V1 is controlled, and the magnitude of the voltage VCC is changed. Low-voltage regulation is achieved.

[0029] In this embodiment: Please refer to Figure 3, the conduction control module includes an inverter U1, an inverter U2, a resistor R2, a potentiometer RP2, and a capacitor C2. The input terminal of the inverter U1 is connected to one end of the potentiometer RP2 and one end of the capacitor C2. The output terminal of the inverter U1 is connected to one end of the resistor R2, the input terminal of the inverter U2, and the voltage amplification module. The other end of the resistor R2 is connected to the other end of the potentiometer RP2. The output terminal of the inverter U2 is connected to the other end of the capacitor C2 and the voltage amplification module.

[0030] Initially, the input terminal of the inverter U1 is at a low level and the output terminal is at a high level. The capacitor C2 is charged through the resistor R2 and the potentiometer RP2. After the capacitor C2 reaches a high level, the input terminal of the inverter U1 becomes a high level and the output terminal becomes a low level. The capacitor C2 discharges through the potentiometer RP2 and the resistor R2 and becomes a low level again. The capacitor C2 charges and discharges reciprocally, forming a complementary PWM signal with a duty cycle of 50% at the output terminals of the inverters U1 and U2. By adjusting the resistance value of the potentiometer RP2, the frequency of the generated PWM signal can be changed.

[0031] In this embodiment: Please refer to Figure 3 , the voltage amplification module includes a transformer W, an MOS transistor V3, and an MOS transistor V2. The first terminal of the input of the transformer W is connected to the D pole of the MOS transistor V3. The second terminal of the input of the transformer W introduces a voltage VCC. The third terminal of the input of the transformer W is connected to the D pole of the MOS transistor V2. The S pole of the MOS transistor V2 is grounded. The S pole of the MOS transistor V3 is grounded. The G pole of the MOS transistor V2 is connected to one end of a resistor R3 and one end of a resistor R4. The other end of the resistor R3 is connected to the conduction control module. The other end of the resistor R4 is grounded. The G pole of the MOS transistor V3 is connected to one end of a resistor R5 and one end of a resistor R6. The other end of the resistor R6 is grounded. The other end of the resistor R5 is connected to the conduction control module. The output terminal of the transformer W is connected to the rectification output module.

[0032] The output terminals of the inverters U1 and U2 form a complementary PWM signal with a duty cycle of 50%, such that only one of the MOS transistors V3 and V2 conducts at the same time, forming two conduction loops. One is the conduction loop of the voltage VCC, the MOS transistor V3, and the ground, and the other is the conduction loop of the voltage VCC, the MOS transistor V2, and the ground. Only one of the two conduction loops conducts at the same time, forming an alternating current at the input of the transformer W, which is amplified by the transformer W and then output.

[0033] In this embodiment: Please refer to Figure 3 , the rectification output module includes a rectifier T, a capacitor C3, a capacitor C4, and an inductor L1. The first terminal and the third terminal of the rectifier T are connected to the voltage amplification module. The second terminal of the rectifier T is grounded. The fourth terminal of the rectifier T is connected to one end of the capacitor C3 and one end of the inductor L1. The other end of the capacitor C3 is grounded. The other end of the inductor L1 is connected to one end of the capacitor C4. The other end of the capacitor C4 is grounded.

[0034] After the AC input, the AC-DC conversion is completed by the rectifier T, and the filtering process is completed through the filtering circuit composed of the capacitor C3, the capacitor C4, and the inductor L1, so that the direct current becomes a stable direct current, and the output voltage VOUT supplies power to the LED.

[0035] The working principle of the present utility model is as follows: The low-voltage adjustment module is used to provide voltage for the voltage amplification module and can adjust the magnitude of the voltage output to the voltage amplification module; the conduction control module is used to control the voltage amplification module to perform direct-AC conversion; the voltage amplification module is used to convert the input voltage into alternating current, amplify the alternating current and then output it to the rectification output module; the rectification output module is used to convert the alternating current into direct current to supply power to the LED.

[0036] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0037] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A boost type LED driving circuit, characterized in that: The boost LED drive circuit comprises: A low voltage regulating module is used to provide voltage to the voltage amplifying module and can adjust the voltage output to the voltage amplifying module; A conduction control module is used to control the voltage amplification module to perform DC to AC conversion; The voltage amplifier module is used to convert the input voltage into alternating current, amplify the alternating current and output it to the rectifier output module; Rectifier output module, used to convert AC power into DC power to power the LED; The low voltage regulating module is connected to the voltage amplifying module, the conduction control module is connected to the voltage amplifying module, and the voltage amplifying module is connected to the rectifier output module.

2. The boost type LED driving circuit according to claim 1, characterized in that: The low voltage regulation module includes a resistor R1, a potentiometer RP1, a MOS tube V1, and a capacitor C1. One end of the resistor R1 is connected to the D pole of the MOS tube V1 and the voltage VDD, and the other end of the resistor R1 is connected to one end of the potentiometer RP1, one end of the capacitor C1, and the G pole of the MOS tube V1. The other end of the potentiometer RP1 is grounded, the other end of the capacitor C1 is grounded, and the S pole of the MOS tube V1 outputs the voltage VCC.

3. The boost type LED driving circuit according to claim 1, characterized in that: The conduction control module includes an inverter U1, an inverter U2, a resistor R2, a potentiometer RP2, and a capacitor C2. The input end of the inverter U1 is connected to one end of the potentiometer RP2 and one end of the capacitor C2. The output end of the inverter U1 is connected to one end of the resistor R2, the input end of the inverter U2, and the voltage amplifier module. The other end of the resistor R2 is connected to the other end of the potentiometer RP2. The output end of the inverter U2 is connected to the other end of the capacitor C2 and the voltage amplifier module.

4. The boost type LED driving circuit according to claim 1, characterized in that: The voltage amplification module includes a transformer W, a MOS tube V3, and a MOS tube V2. The first input end of the transformer W is connected to the D pole of the MOS tube V3. The second input end of the transformer W introduces the voltage VCC. The third input end of the transformer W is connected to the D pole of the MOS tube V2. The S pole of the MOS tube V2 is grounded. The S pole of the MOS tube V3 is grounded. The G pole of the MOS tube V2 is connected to one end of the resistor R3 and one end of the resistor R4. The other end of the resistor R3 is connected to the conduction control module. The other end of the resistor R4 is grounded. The G pole of the MOS tube V3 is connected to one end of the resistor R5 and one end of the resistor R6. The other end of the resistor R6 is grounded. The other end of the resistor R5 is connected to the conduction control module. The output end of the transformer W is connected to the rectifier output module.

5. The boost type LED driving circuit according to claim 4, characterized in that: The rectifier output module includes a rectifier T, a capacitor C3, a capacitor C4, and an inductor L1. The first end and the third end of the rectifier T are connected to the voltage amplification module, the second end of the rectifier T is grounded, the fourth end of the rectifier T is connected to one end of the capacitor C3 and one end of the inductor L1, the other end of the capacitor C3 is grounded, the other end of the inductor L1 is connected to one end of the capacitor C4, and the other end of the capacitor C4 is grounded.

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