LED drive circuit and physiotherapy lamp

Abstract

The utility model provides an LED drive circuit and a physiotherapy lamp. The LED drive circuit comprises a first power supply, a second power supply, a coupling isolation module, an amplification module and a switch control module. Wherein the first power supply and the second power supply are respectively connected with the coupling isolation module, and the first power supply and the second power supply are used for supplying power to the coupling isolation module; the coupling isolation module is used for being connected with a master control module and used for carrying out coupling isolation on digital signals output by the master control module. A first end of the amplification module is connected with the coupling isolation module, and the amplification module is used for amplifying a signal output by the coupling isolation module; a second end of the amplification module is connected with the switch control module, and the switch control module is used for performing frequency control according to a signal output by the amplification module; the switch control module is used for being connected with a load module, and the switch control module is used for controlling the frequency of the load module.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor lighting equipment driving, in particular to an LED driving circuit and a physiotherapy lamp. Background Art

[0002] Therapeutic lamps are a type of medical equipment that mainly uses light of a specific wavelength to irradiate a certain part of the body to help improve or treat problems such as pain, skin problems, sleep disorders, etc. It can be divided into infrared therapy lamps, red light therapy lamps, ultraviolet therapy lamps, blue light therapy lamps, etc. according to the different wavelengths of light used.

[0003] In the related art, the therapy lamp needs to adjust the LED light wave energy output frequency through the LED driving circuit so that the therapy lamp can emit light at a specified frequency. Generally, the LED driving circuit is powered by multiple power supplies and has multiple systems. Powering multiple systems will cause the problem of different power supplies. If the multiple power supplies are not grounded, a potential difference may be generated between the power grounds, which may introduce noise and affect the quality of the signal; or because the power supplies are not grounded, there will be a potential difference when directly transmitting the signal, which may cause data loss or errors. Utility Model Content

[0004] In view of the above problems, in a first aspect, an embodiment of the utility model provides an LED driving circuit, the LED driving circuit comprising: a first power supply, a second power supply, a coupling isolation module, an amplification module, and a switch control module;

[0005] Wherein, the first power supply and the second power supply are respectively connected to the coupling isolation module, and the first power supply and the second power supply are used to power the coupling isolation module;

[0006] The coupling isolation module is used to connect to the main control module and to couple and isolate the digital signal output by the main control module;

[0007] The first end of the amplification module is connected to the coupling isolation module, and the amplification module is used to amplify the signal output by the coupling isolation module;

[0008] The second end of the amplifying module is connected to the switch control module, and the switch control module is used to perform frequency control according to the signal output by the amplifying module;

[0009] The switch control module is used to connect with the load module, and the switch control module is used to control the frequency of the load module.

[0010] In some possible implementations, the coupling isolation module includes an isolation chip U1 , and the first power supply and the second power supply are connected to power pins of the isolation chip U1 .

[0011] In some possible implementations, the main control module is connected to a signal input pin of the isolation chip U1.

[0012] In some possible implementations, the positive and negative electrodes of the first power supply are respectively connected to the VDD1 pin and the GND1 pin of the isolation chip U1, and the positive and negative electrodes of the second power supply are respectively connected to the VDD2 pin and the GND2 pin of the isolation chip.

[0013] In some possible implementations, a diode VD1 is connected in parallel between the VDD2 pin and the GND2 pin.

[0014] In some possible implementations, the amplification module includes a transistor Q2, the base of the transistor Q2 is connected to the signal output pin of the isolation chip U1, the emitter of the transistor Q2 is connected to the switch control module, and the collector of the transistor Q2 is connected to the power supply.

[0015] In some possible implementations, the switch control module includes a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to the emitter of the transistor Q2, a drain of the MOS transistor Q1 is connected to the load module, and a source of the MOS transistor Q1 is grounded.

[0016] In some possible implementations, a diode D1 is connected in parallel between the base and the collector of the transistor Q2.

[0017] In some possible implementations, a diode VD2 is connected in parallel between the gate and the drain of the MOS transistor Q1.

[0018] In a second aspect, the utility model further provides a physiotherapy lamp, comprising an LED driving circuit as described in the above aspect.

[0019] The LED driving circuit provided by the embodiment of the utility model includes a first power supply, a second power supply, a coupling isolation module, an amplifying module, and a switch control module, wherein the first power supply and the second power supply are used to power the coupling isolation module, the coupling isolation module receives the digital signal input by the main control module, and outputs it to the amplifying module for energy amplification through the coupling isolation of the coupling isolation module, and then according to the signal output by the amplifying module, the switch control module can control the on / off state of the load module to adjust the light frequency. The embodiment of the utility model couples the signal from the main control module to the other end output through the coupling isolation module, performs isolation processing and then amplifies and controls, thereby realizing the function of adjusting the frequency. In addition, the coupling isolation can ensure that the signal transmission between different power supply systems is not affected by the potential difference between the power supply ground, and can correctly transmit the signal when there is a power supply potential difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a module block diagram of an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the circuit principle of an embodiment of the utility model;

[0022] Description of reference numerals: 100, first power supply; 200, second power supply; 300, coupling isolation module; 400, amplification module; 500, switch control module; 600, main control module; 700, load module. DETAILED DESCRIPTION

[0023] The overall idea of ​​the technical solution provided by the utility model is as follows:

[0024] See also Figure 1 , an LED driving circuit, comprising:

[0025] A first power supply 100, a second power supply 200, a coupling isolation module 300, an amplification module 400, and a switch control module 500;

[0026] The first power supply 100 and the second power supply 200 are respectively connected to the coupling isolation module 300, and the first power supply 100 and the second power supply 200 are used to supply power to the coupling isolation module 300;

[0027] The coupling isolation module 300 is used to connect with the main control module 600 and to couple and isolate the digital signal output by the main control module 600;

[0028] The first end of the amplification module 400 is connected to the coupling isolation module 300, and the amplification module 400 is used to amplify the signal output by the coupling isolation module 300;

[0029] The second end of the amplifying module 400 is connected to the switch control module 500, and the switch control module 500 is used to perform frequency control according to the signal output by the amplifying module 400;

[0030] The switch control module 500 is used to connect with the load module 700, and the switch control module 500 is used to control the frequency of the load module 700;

[0031] Among them, the first power supply 100 and the second power supply 200 supply power to the coupling isolation module 300, and the coupling isolation module 300 receives the digital signal input by the main control module 600, and outputs it to the amplification module 400 for energy amplification through the coupling isolation of the coupling isolation module 300, and then according to the signal output by the amplification module 400, the switch control module 500 can control the on / off state of the load module 700 to adjust the light frequency. The embodiment of the utility model couples the signal from the main control module 600 to the other end output through the coupling isolation module 300, performs isolation processing and then amplifies and controls, thereby realizing the function of adjusting the frequency. In addition, the coupling isolation can ensure that the signal transmission between different power supply systems is not affected by the potential difference between the power supply grounds, and can correctly transmit the signal when there is a power supply potential difference.

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] See also Figure 2 , the coupling isolation module 300 includes an isolation chip U1, and the first power supply 100 and the second power supply 200 are connected to the power pin of the isolation chip U1. Specifically, the first power supply 100 and the second power supply 200 can provide stable power output for the isolation chip U1. The isolation chip U1 plays a vital role in the entire system. It can ensure the true and accurate transmission of signals between different power supply systems, and avoid any interference to the signal caused by the potential difference between the power supply and the ground. In the actual working process, the isolation chip U1 is mainly responsible for receiving the digital signals input by the main control module 600, and then outputting these signals to the next module after coupling isolation.

[0034] Preferably, the isolation chip U1 is of model CS817x20. CS817x20 is a high-performance isolation chip, which has been widely recognized in the industry for its excellent performance and stable working characteristics. This chip provides a powerful isolation function for our drive circuit. It can ensure stable signal transmission regardless of high frequency and high current, and greatly reduce the interference caused by power supply level differences.

[0035] Furthermore, the main control module 600 is connected to the signal input pin of the isolation chip U1. Figure 2 The I NA and I NB pins of the isolation chip U1 are signal input pins. The main control module 600 is responsible for generating and controlling digital signals for the entire system and transmitting them through the I NA and I NB pins connected to the isolation chip U1. The isolation chip U1 then performs coupling isolation processing on these input signals.

[0036] Further, the positive and negative electrodes of the first power supply 100 are respectively connected to the VDD1 pin and the GND1 pin of the isolation chip U1, and the positive and negative electrodes of the second power supply 200 are respectively connected to the VDD2 pin and the GND2 pin of the isolation chip. Figure 2 , the first power supply 100 inputs 5V voltage, the second power supply 200 inputs voltage through the VCC1 terminal, the first power supply 100 can directly power the isolation chip U1 through the VDD1 pin, and connect the power ground through the GND1 pin to ensure the stability of the chip operation. Similarly, the positive and negative poles of the second power supply 200 are also designed to be connected to the VDD2 pin and the GND2 pin of the isolation chip U1 respectively. The second power supply 200 can supply power to the isolation chip U1 through the VDD2 pin, and connect the power ground through the GND2 pin.

[0037] For further information, see Figure 2 , a diode VD1 is connected in parallel between the VDD2 pin and the GND2 pin. Specifically, when the power supply of the VDD2 pin is too large, the diode VD1 will be turned on, and then the excess current will be directed into the ground line, thereby protecting the internal circuit of the chip from damage; when the power supply is normal or low, the diode VD1 will be in the cut-off state, allowing the power supply of the VDD2 pin to proceed normally. This design can, on the one hand, protect the isolation chip U1 from current shocks when facing excessive power supply, and on the other hand, ensure the stable power supply of the power supply to the chip, ensuring the stable operation of the power management system.

[0038] For further information, see Figure 2, the amplification module 400 includes a transistor Q2, the base of the transistor Q2 is connected to the signal output pin of the isolation chip U1, the emitter of the transistor Q2 is connected to the switch control module 500, and the collector of the transistor Q2 is connected to the power supply. Specifically, the isolation chip U1 receives the signal transmitted from the main control module 600, and outputs these signals to the base of the transistor Q2 after internal coupling isolation processing. After entering the transistor Q2, these signals will be amplified inside the transistor and output from the emitter, and then input into the switch control module 500 for frequency adjustment and control. The collector of the transistor Q2 is directly connected to the power supply to provide a stable power supply for the normal operation of the transistor Q2.

[0039] For further information, see Figure 2 , the switch control module 500 includes a MOS tube Q1, the gate of the MOS tube Q1 is connected to the emitter of the triode Q2, the drain of the MOS tube Q1 is connected to the load module 700, and the source of the MOS tube Q1 is grounded. Specifically, the signal output of the triode Q2 is used as a driving force to control the on or off state of the MOS tube Q1. When the triode Q2 receives an input signal and amplifies the energy, the amplified signal will be transmitted to the gate of the MOS tube Q1. Therefore, the state of the output signal of the triode Q2 (i.e., high level or low level) will directly determine the switch state of the MOS tube Q1. At the same time, the drain of the MOS tube Q1 is connected to the load module 700, which means that when the MOS tube Q1 is turned on, the current can flow to the load module 700 through this tube. Correspondingly, when the MOS tube Q1 is turned off, the path for the current to flow to the load module 700 will be cut off. This design allows us to use the output signal of the triode Q2 to control the switch state of the load power supply, thereby realizing the adjustment of the light emission frequency. This design uses a unique method to achieve frequency control and is innovative. It skillfully combines the amplification module 400 (transistor Q2) and the switch control module 500 (MOS tube Q1) to achieve the control of the load power switch and the light emission frequency.

[0040] For further information, see Figure 2 , a diode D1 is connected in parallel between the base and collector of transistor Q2. During the operation of the circuit, diode D1 and transistor Q2 will share the same voltage, and diode D1 plays a protective role in this link. Specifically, when the voltage changes direction, diode D1 will trip immediately, thereby preventing the current from flowing in the opposite direction and protecting transistor Q2 from possible damage. This connection method can increase the stability and protection of the circuit and prevent instantaneous voltage peaks from damaging transistor Q2. At the same time, when the voltage is established in the forward direction between the base and collector of transistor Q2, diode D1 will be turned on, allowing the current to flow normally, meeting the working requirements of the circuit.

[0041] For further information, see Figure 2 , a diode VD2 is connected in parallel between the gate and drain of the MOS tube Q1. Specifically, when the voltage is reversely established from the gate to the drain of the MOS tube Q1, the diode VD2 will block and prevent the reverse current from flowing through the MOS tube Q1, which can provide an effective protection for the MOS tube Q1 and prevent damage that may be caused by the reverse current. On the other hand, when the voltage is established in the forward direction between the gate and the drain of the MOS tube Q1, the diode VD2 will be turned on, and the current can flow normally to meet the working requirements of the circuit. This design can effectively improve the stability and safety of the circuit, and also ensure the long-term stable operation of the MOS tube Q1 and the entire circuit system.

[0042] The utility model embodiment also provides a physiotherapy lamp, including an LED driving circuit as in the aforementioned embodiment. The various variations and specific embodiments in the aforementioned embodiment are also applicable to the physiotherapy lamp of this embodiment. Through the aforementioned detailed description of an LED driving circuit, those skilled in the art can clearly know the implementation method of the physiotherapy lamp in this embodiment. For the sake of brevity of the specification, it will not be described in detail here.

[0043] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0044] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An LED driving circuit, characterized in that: include: A first power supply, a second power supply, a coupling isolation module, an amplification module, and a switch control module; Wherein, the first power supply and the second power supply are respectively connected to the coupling isolation module, and the first power supply and the second power supply are used to power the coupling isolation module; The coupling isolation module is used to connect to the main control module and to couple and isolate the digital signal output by the main control module; The first end of the amplification module is connected to the coupling isolation module, and the amplification module is used to amplify the signal output by the coupling isolation module; The second end of the amplifying module is connected to the switch control module, and the switch control module is used to perform frequency control according to the signal output by the amplifying module; The switch control module is used to be connected to the load module, and the switch control module is used to control the frequency of the load module.

2. The LED driving circuit according to claim 1, characterized in that: The coupling isolation module includes an isolation chip U1 , and the first power supply and the second power supply are connected to power pins of the isolation chip U1 .

3. The LED driving circuit according to claim 2, characterized in that: The main control module is connected to the signal input pin of the isolation chip U1.

4. The LED driving circuit according to claim 2, characterized in that: The positive and negative electrodes of the first power supply are respectively connected to the VDD1 pin and the GND1 pin of the isolation chip U1 , and the positive and negative electrodes of the second power supply are respectively connected to the VDD2 pin and the GND2 pin of the isolation chip.

5. The LED driving circuit according to claim 4, characterized in that: A diode VD1 is connected in parallel between the VDD2 pin and the GND2 pin.

6. The LED driving circuit according to claim 3, characterized in that: The amplification module includes a transistor Q2, a base of the transistor Q2 is connected to a signal output pin of the isolation chip U1, an emitter of the transistor Q2 is connected to the switch control module, and a collector of the transistor Q2 is connected to a power supply.

7. The LED driving circuit according to claim 6, characterized in that: The switch control module includes a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to the emitter of the transistor Q2, a drain of the MOS transistor Q1 is connected to the load module, and a source of the MOS transistor Q1 is grounded.

8. The LED driving circuit according to claim 6, characterized in that: A diode D1 is connected in parallel between the base and collector of the transistor Q2.

9. The LED driving circuit according to claim 7, characterized in that: A diode VD2 is connected in parallel between the gate and drain of the MOS transistor Q1.

10. A physiotherapy lamp, characterized in that: It comprises an LED driving circuit as described in any one of claims 1 to 7.

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