Non-isolated power supply circuit
By designing a non-isolated power supply circuit containing multiple protection and conversion modules, the problem that LED lights cannot be completely turned off in non-isolated LED power supply is solved, and the dimming is turned off without afterglow is achieved. The high-efficiency and low-cost characteristics of the non-isolated power supply are used to achieve the same function as an isolated power supply.
Patent Information
- Application Number
- CN202421599184.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In non-isolated LED power supply, there is a high pressure difference between the ground substrate of the lamp board and the output when the dimming is turned off, resulting in the LED light still being slightly lit and cannot be completely turned off.
A non-isolated power supply circuit is designed, including input protection module, rectifier filter module, drive boost module, strobe protection module, color temperature conversion module and lamp board module. Through the combination of these modules, color temperature isolation conversion is realized to ensure that the LED lamp has no afterglow when dimming is turned off.
It realizes that the LED light is completely turned off and has no afterglow when the dimming is turned off. It utilizes the efficient and low-cost characteristics of the non-isolated power supply to achieve the same functional effect as the isolated power supply.
Smart Images
Figure CN222869091U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply control, in particular to a non-isolated power supply circuit. Background Art
[0002] In non-isolated LED power supplies, they have been widely used in lamps due to their relatively simple structure, high efficiency, small size, and relatively low cost. However, since the power input and output are non-isolated, when the dimming is turned off, there is a high voltage difference between the ground substrate of the lamp board and the output. A weak current loop will be formed through the capacitor grounding inside the power supply, causing the LED lamp to remain in a slightly bright state, which is usually called afterglow, and the effect of completely turning off the LED lamp cannot be achieved. Summary of the invention
[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a non-isolated power supply circuit that can achieve the effect of completely turning off an LED lamp.
[0004] The utility model is realized by the following technical solutions:
[0005] A non-isolated power supply circuit comprises an input protection module, a rectification and filtering module, a driving boost module, a strobe protection module, a color temperature conversion module and a light board module, wherein the output end of the input protection module is electrically connected to the input end of the rectification and filtering module, the output end of the rectification and filtering module is electrically connected to the input end of the driving boost module, the output end of the driving boost module is electrically connected to the input end of the strobe protection module, the output end of the strobe protection module is electrically connected to the input end of the color temperature conversion module, and the output end of the color temperature conversion module and the first output end of the strobe protection module are electrically connected to the light board module.
[0006] Wherein, the input protection module includes a first thermal relay FR1 and a second thermal relay FR2.
[0007] Among them, the rectification and filtering module includes a bridge rectifier DB1, an electrostatic suppressor SRV1, a capacitor C1, an inductor L1, a resistor R1, a resistor R2, a capacitor C2 and a capacitor C3. The No. 2 end corner of the bridge rectifier BD1 is electrically connected to the first thermal relay FR1, and the No. 3 end corner of the bridge rectifier BD1 is electrically connected to the second thermal relay FR2. The No. 1 end corner and the No. 4 end corner of the bridge rectifier BD1 are respectively connected in series with the electrostatic suppressor SRV1 and the capacitor C1. The No. 1 end corner of the bridge rectifier BD1 is also electrically connected to one end of the inductor L1 and one end of the resistor R2. The No. 4 end corner of the bridge rectifier BD1 is also electrically connected to one end of the resistor R1. The other end of the inductor L1 and the other end of the resistor R2 are respectively electrically connected to one end of the capacitor C2, one end of the capacitor C3 and the input end of the driving boost module. The other end of the resistor R1 is electrically connected to the other end of the capacitor C2, and the other end of the capacitor C3 is grounded.
[0008] Among them, the driving boost module includes a chip U1 with model BP3286HL, a resistor R3A, a resistor R3B, a resistor R6, an inductor L2, a diode D1 and a capacitor EC1, one end of the resistor R3A is electrically connected to the output end of the rectifier and filter module, the negative electrode of the capacitor EC1 and the first input end of the strobe protection module, the other end of the resistor R3A is electrically connected to one end of the resistor R3B, the other end of the resistor R3B is electrically connected to terminal pin No. 1 of the chip U1, one end of the resistor R6 is electrically connected to terminal pin No. 6 of the chip U1, one end of the inductor L2 and the positive electrode of the diode D1 are electrically connected to terminal pin No. 5 of the chip U1, and the positive electrode of the capacitor EC1 and the other end of the resistor R6 are electrically connected to the second input end of the strobe protection module.
[0009] Among them, the non-isolated power supply circuit also includes a current limiting module and a power conversion module, the current limiting module includes a resistor RS1, a resistor RS2 and a resistor RS3, the power conversion module includes a switching switch SW1, a 5W input end and an 8W input end, the resistor RS1 and the resistor RS2 are connected in parallel, one end of the resistor RS1 and one end of RS3 are electrically connected to terminal No. 4 of the chip U1, the other end of the resistor RS1 is grounded, the other end of RS3 is electrically connected to the first switching end and the 8W input end of the switching switch SW1, and the 5W input end is electrically connected to the second switching end of the switching switch SW1.
[0010] Among them, the strobe protection module includes a diode D2, a diode D3, a resistor R8, a resistor R9, a diode D4, a capacitor EC2 and a transistor Q1, the positive electrode of the diode D2 and one end of the resistor R8 are electrically connected to the output end of the driving boost module, the negative electrode of the diode D2 and the other end of the resistor R8 are electrically connected to the negative electrode of the diode D3, the positive electrode of the diode D3 is electrically connected to one end of the resistor R9, and the other end of the resistor R9 is respectively electrically connected to the negative electrode of the diode D4, the positive electrode of the capacitor EC2 and the output end of the transistor Q1, the positive electrode of the diode D4 and the first input end of the transistor Q1 are electrically connected to the light board module, and the negative electrode of the capacitor EC2 is electrically connected to the input end of the color temperature conversion module.
[0011] Beneficial effects of the utility model:
[0012] The utility model discloses a non-isolated power supply circuit, which can realize color temperature isolation conversion by providing an input protection module, a rectifier filter module, a drive boost module, a strobe protection module, a color temperature conversion module and a light board module. Even if the light source of the light board is not lit, dimming and shutting off without afterglow can be realized. The non-isolated power supply with high efficiency, small size and low cost can achieve the same functional effect as the isolated power supply. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.
[0014] Figure 1 A circuit schematic diagram of a non-isolated power supply circuit of the utility model. DETAILED DESCRIPTION
[0015] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0016] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0017] In non-isolated LED power supplies, they have been widely used in lamps due to their relatively simple structure, high efficiency, small size, and relatively low cost. However, since the power input and output are non-isolated, when the dimming is turned off, there is a high voltage difference between the ground substrate of the lamp board and the output. A weak current loop will be formed through the capacitor grounding inside the power supply, causing the LED lamp to remain in a slightly bright state, which is usually called afterglow, and the effect of completely turning off the LED lamp cannot be achieved.
[0018] In order to solve the above problems, this embodiment discloses a non-isolated power supply circuit, and its circuit schematic diagram is as follows: Figure 1 As shown, the circuit includes an input protection module, a rectification and filtering module, a driving boost module, a strobe protection module, a color temperature conversion module and a light board module, the output end of the input protection module is electrically connected to the input end of the rectification and filtering module, the output end of the rectification and filtering module is electrically connected to the input end of the driving boost module, the output end of the driving boost module is electrically connected to the input end of the strobe protection module, the output end of the strobe protection module is electrically connected to the input end of the color temperature conversion module, and the output end of the color temperature conversion module and the first output end of the strobe protection module are electrically connected to the light board module.
[0019] Specifically, the input protection module includes a first thermal relay FR1 and a second thermal relay FR2.
[0020] Specifically, the rectifier and filter module includes a bridge rectifier DB1, an electrostatic suppressor SRV1, a capacitor C1, an inductor L1, a resistor R1, a resistor R2, a capacitor C2 and a capacitor C3. The No. 2 end corner of the bridge rectifier BD1 is electrically connected to the first thermal relay FR1, the No. 3 end corner of the bridge rectifier BD1 is electrically connected to the second thermal relay FR2, the No. 1 end corner and the No. 4 end corner of the bridge rectifier BD1 are respectively connected in series with the electrostatic suppressor SRV1 and the capacitor C1, the No. 1 end corner of the bridge rectifier BD1 is also electrically connected to one end of the inductor L1 and one end of the resistor R2, the No. 4 end corner of the bridge rectifier BD1 is also electrically connected to one end of the resistor R1, the other end of the inductor L1 and the other end of the resistor R2 are respectively electrically connected to one end of the capacitor C2, one end of the capacitor C3 and the input end of the driving boost module, the other end of the resistor R1 is electrically connected to the other end of the capacitor C2, and the other end of the capacitor C3 is grounded.
[0021] Specifically, the driving boost module includes a chip U1 with model number BP3286HL, a resistor R3A, a resistor R3B, a resistor R6, an inductor L2, a diode D1 and a capacitor EC1, one end of the resistor R3A is electrically connected to the output end of the rectifier and filter module, the negative electrode of the capacitor EC1 and the first input end of the strobe protection module, the other end of the resistor R3A is electrically connected to one end of the resistor R3B, the other end of the resistor R3B is electrically connected to terminal pin No. 1 of the chip U1, one end of the resistor R6 is electrically connected to terminal pin No. 6 of the chip U1, one end of the inductor L2 and the positive electrode of the diode D1 are electrically connected to terminal pin No. 5 of the chip U1, and the positive electrode of the capacitor EC1 and the other end of the resistor R6 are electrically connected to the second input end of the strobe protection module.
[0022] Specifically, the non-isolated power supply circuit also includes a current limiting module and a power conversion module, the current limiting module includes a resistor RS1, a resistor RS2 and a resistor RS3, the power conversion module includes a switching switch SW1, a 5W input end and an 8W input end, the resistor RS1 and the resistor RS2 are connected in parallel, one end of the resistor RS1 and one end of RS3 are electrically connected to pin No. 4 of the chip U1, the other end of the resistor RS1 is grounded, the other end of RS3 is electrically connected to the first switching end and the 8W input end of the switching switch SW1, and the 5W input end is electrically connected to the second switching end of the switching switch SW1.
[0023] Specifically, the strobe protection module includes a diode D2, a diode D3, a resistor R8, a resistor R9, a diode D4, a capacitor EC2 and a transistor Q1. The positive electrode of the diode D2 and one end of the resistor R8 are electrically connected to the output end of the driving boost module, the negative electrode of the diode D2 and the other end of the resistor R8 are electrically connected to the negative electrode of the diode D3, the positive electrode of the diode D3 is electrically connected to one end of the resistor R9, and the other end of the resistor R9 is respectively electrically connected to the negative electrode of the diode D4, the positive electrode of the capacitor EC2 and the output end of the transistor Q1, the positive electrode of the diode D4 and the first input end of the transistor Q1 are electrically connected to the light board module, and the negative electrode of the capacitor EC2 is electrically connected to the input end of the color temperature conversion module.
[0024] In summary, the non-isolated power supply circuit of this embodiment is equipped with an input protection module, a rectifier and filter module, a drive boost module, a strobe protection module, a color temperature conversion module and a light board module, which can realize color temperature isolation conversion. Even if the light source of the light board is not lit, dimming and shutdown without afterglow can be achieved. A non-isolated power supply with high efficiency, small size and low cost can achieve the same functional effect as an isolated power supply.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.
Claims
1. A non-isolated power supply circuit, characterized in that: It includes an input protection module, a rectification and filtering module, a driving boost module, a strobe protection module, a color temperature conversion module and a light board module. The output end of the input protection module is electrically connected to the input end of the rectification and filtering module, the output end of the rectification and filtering module is electrically connected to the input end of the driving boost module, the output end of the driving boost module is electrically connected to the input end of the strobe protection module, the output end of the strobe protection module is electrically connected to the input end of the color temperature conversion module, and the output end of the color temperature conversion module and the first output end of the strobe protection module are electrically connected to the light board module.
2. A non-isolated power supply circuit according to claim 1, characterized in that: The input protection module includes a first thermal relay FR1 and a second thermal relay FR2.
3. A non-isolated power supply circuit according to claim 2, characterized in that: The rectifier and filter module includes a bridge rectifier DB1, an electrostatic suppressor SRV1, a capacitor C1, an inductor L1, a resistor R1, a resistor R2, a capacitor C2 and a capacitor C3. The No. 2 end corner of the bridge rectifier BD1 is electrically connected to the first thermal relay FR1, the No. 3 end corner of the bridge rectifier BD1 is electrically connected to the second thermal relay FR2, the No. 1 end corner and the No. 4 end pin of the bridge rectifier BD1 are respectively connected in series with the electrostatic suppressor SRV1 and the capacitor C1, the No. 1 end corner of the bridge rectifier BD1 is also electrically connected to one end of the inductor L1 and one end of the resistor R2, the No. 4 end corner of the bridge rectifier BD1 is also electrically connected to one end of the resistor R1, the other end of the inductor L1 and the other end of the resistor R2 are respectively electrically connected to one end of the capacitor C2, one end of the capacitor C3 and the input end of the driving boost module, the other end of the resistor R1 is electrically connected to the other end of the capacitor C2, and the other end of the capacitor C3 is grounded.
4. A non-isolated power supply circuit according to claim 1, characterized in that: The driving boost module includes a chip U1 with model number BP3286HL, a resistor R3A, a resistor R3B, a resistor R6, an inductor L2, a diode D1 and a capacitor EC1. One end of the resistor R3A is electrically connected to the output end of the rectifier and filter module, the negative electrode of the capacitor EC1 and the first input end of the strobe protection module, the other end of the resistor R3A is electrically connected to one end of the resistor R3B, the other end of the resistor R3B is electrically connected to terminal pin No. 1 of the chip U1, one end of the resistor R6 is electrically connected to terminal pin No. 6 of the chip U1, one end of the inductor L2 and the positive electrode of the diode D1 are electrically connected to terminal pin No. 5 of the chip U1, and the positive electrode of the capacitor EC1 and the other end of the resistor R6 are electrically connected to the second input end of the strobe protection module.
5. A non-isolated power supply circuit according to claim 4, characterized in that: The non-isolated power supply circuit also includes a current limiting module and a power conversion module. The current limiting module includes a resistor RS1, a resistor RS2 and a resistor RS3. The power conversion module includes a switching switch SW1, a 5W input end and an 8W input end. The resistor RS1 and the resistor RS2 are connected in parallel. One end of the resistor RS1 and one end of RS3 are electrically connected to terminal 4 of the chip U1. The other end of the resistor RS1 is grounded. The other end of RS3 is electrically connected to the first switching end and the 8W input end of the switching switch SW1. The 5W input end is electrically connected to the second switching end of the switching switch SW1.
6. A non-isolated power supply circuit according to claim 1, characterized in that: The strobe protection module includes a diode D2, a diode D3, a resistor R8, a resistor R9, a diode D4, a capacitor EC2 and a transistor Q1. The positive electrode of the diode D2 and one end of the resistor R8 are electrically connected to the output end of the driving boost module, the negative electrode of the diode D2 and the other end of the resistor R8 are electrically connected to the negative electrode of the diode D3, the positive electrode of the diode D3 is electrically connected to one end of the resistor R9, and the other end of the resistor R9 is respectively electrically connected to the negative electrode of the diode D4, the positive electrode of the capacitor EC2 and the output end of the transistor Q1, the positive electrode of the diode D4 and the first input end of the transistor Q1 are electrically connected to the light board module, and the negative electrode of the capacitor EC2 is electrically connected to the input end of the color temperature conversion module.