Electronic ballast input end anti-surge and electromagnetic compatibility suppression circuit
By designing common mode surge protection modules and filter modules at the input end of the electronic ballast, the problems of long development cycles and high costs of existing circuits are solved, and efficient surge and electromagnetic interference suppression are achieved, ensuring the safety of the system and reducing costs.
Patent Information
- Application Number
- CN202422130300.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-01
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-01
AI Technical Summary
The existing anti-surge and electromagnetic interference circuits have a long development cycle, long testing time, large size, high cost and average filtering effect, so they cannot effectively protect the electronic ballast.
The circuit structure including a first protection element, a varistor, a common mode inductor, a transient diode and a capacitor is adopted to form a common mode surge protection module, a filter module and a second protection circuit, and surge and electromagnetic interference are suppressed through a multi-layer circuit design.
Improves electromagnetic interference suppression level and system safety, avoids surge shock, reduces material model selection and repeated design, and reduces circuit costs.
Smart Images
Figure CN223194406U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuits, in particular to an anti-surge and electromagnetic compatibility suppression circuit for an input end of an electronic ballast. Background Art
[0002] Surges are sudden, high-energy electromagnetic waves that can damage electronic devices, especially power electronics. Surges are typically caused by sudden changes in power switches, inductors, and capacitors, resulting in instantaneous increases in voltage or current, which can damage power electronics. Electromagnetic interference (EMI) refers to the interference of external electromagnetic fields on electronic devices, which can affect their proper operation. EMI typically originates from factors such as power supply, electromagnetic radiation, and electromagnetic induction, and can cause malfunctions and failures in power electronics. Surges and EMI are extremely harmful to power electronics (such as high-power switching power supplies, chargers, communication power supplies, and high-power electronic ballasts), significantly impacting product stability and reliability.
[0003] However, existing surge protection and electromagnetic interference circuits have long development cycles, long testing times, large sizes, high costs, and average filtering effects, and often lack sufficient space to accommodate surge protectors. Utility Model Content
[0004] The purpose of the utility model is to provide an anti-surge and electromagnetic compatibility suppression circuit for the input end of an electronic ballast, which solves the problems of long development cycle, long testing time, large size, high cost and general filtering effect of anti-surge and electromagnetic interference circuits.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electronic ballast input end surge protection and electromagnetic compatibility suppression circuit, comprising a first protection element, the outer side of the first protection element is connected to an L connection end through a wire, the outer side of the first protection element is connected to a first varistor through a wire, the outer side of the first varistor is connected to an N connection end through a wire, the outer side of the first protection element is connected to a second varistor through a wire, the outer side of the second varistor is connected to a GND connection end through a wire, a first capacitor is connected between the first protection element and the connection end through a wire, the first capacitor and the first varistor The first protection element is connected in parallel, a first common-mode inductor is connected to the first common-mode inductor via a wire, the first common-mode inductor and the N connection terminal are connected via a wire, the outer side of the first common-mode inductor is connected to the second common-mode inductor via a wire, a second capacitor, a fourth capacitor, a first transient diode, a first resistor and a fifth capacitor are connected in parallel between the first common-mode inductor and the second common-mode inductor via a wire, the outer side of the second common-mode inductor is connected to the third common-mode inductor via a wire, a sixth capacitor is connected between the second common-mode inductor and the third common-mode inductor via a wire, and the outer side of the third common-mode inductor is connected to the connection terminal OUT1 and the connection terminal OUT2 via a wire.
[0006] Preferably, a third varistor is connected to the outer side of the N connection terminal via a wire, and the third varistor is connected to the GND connection terminal via a wire. The third varistor cooperates with the second varistor to form a common-mode surge protection module.
[0007] Preferably, a second transient diode is connected between the first common-mode inductor and the connection terminal via a wire, and a third transient diode is connected between the first common-mode inductor and the GND connection terminal via a wire. The third transient diode, the second transient diode, and the third capacitor are connected in parallel. The first, second, and third transient diodes cooperate to form a second protection circuit.
[0008] Preferably, a seventh capacitor is connected between the second common-mode inductor and the third common-mode inductor via a wire, the seventh capacitor is connected to the GND connection terminal via a wire, an eighth capacitor is connected between the second common-mode inductor and the connection terminal via a wire, and the eighth capacitor and the seventh capacitor are connected in parallel. The first capacitor, the first inductor, the second capacitor, the third capacitor, and the fourth capacitor can form a filter module circuit.
[0009] Preferably, a ninth capacitor is connected between the connection terminal OUT1 and the connection terminal OUT2 via a wire, and the ninth capacitor is connected in parallel with the third common-mode inductor. The ninth capacitor is provided to filter out differential-mode noise signals in the mains current.
[0010] Preferably, a third capacitor is connected between the first common-mode inductor and the second common-mode inductor via a wire, and the third capacitor is connected to the connection end via a wire. The third capacitor is provided to further filter out common-mode noise signals in the mains power supply signal.
[0011] The beneficial effects of the utility model are as follows:
[0012] The utility model forms a common-mode surge protection module through the second varistor and the third varistor, thereby forming a first protection circuit to suppress the surge signal contained in the mains power supply; the first capacitor, the first inductor, the second capacitor, the third capacitor, and the fourth capacitor form a filter module circuit, which can filter out the common-mode signal and the differential-mode signal in the mains signal; the first transient diode, the second transient diode, and the third transient diode form a second protection circuit, which further suppresses the residual surge signal contained in the current output from the filter module, and can solve the problem of poor versatility of other filter circuits. It can not only improve the electromagnetic interference suppression level and safety of the system, but also avoid the circuit from being subjected to surge impact, so that the product can operate safely, avoid repeated design and reduce the selection of material models, and also reduce the cost of the entire circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is the overall structural circuit diagram of the utility model.
[0014] In the figure: F1, first protection element; MOV1, first varistor; MOV2, second varistor; MOV3, third varistor; ZD1, first transient diode; ZD2, second transient diode; ZD3, third transient diode; R1, first resistor; L1, first common-mode inductor; L2, second common-mode inductor; L3, third common-mode inductor; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; C8, eighth capacitor; C9, ninth capacitor. DETAILED DESCRIPTION
[0015] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0016] See also Figure 1An electronic ballast input end surge protection and electromagnetic compatibility suppression circuit includes a first protection element F1, the outer side of the first protection element F1 is connected to an L connection terminal via a wire, the outer side of the first protection element F1 is connected to a first varistor MOV1 via a wire, the outer side of the first varistor MOV1 is connected to an N connection terminal via a wire, the outer side of the first protection element F1 is connected to a second varistor MOV2 via a wire, the outer side of the second varistor MOV2 is connected to a GND connection terminal via a wire, the outer side of the N connection terminal is connected to a third varistor MOV3 via a wire, the third varistor MOV3 and the GND connection terminal are connected via a wire, and the third varistor MOV3 can form a common mode by cooperating with the second varistor MOV2. In the surge protection module, a first capacitor C1 is connected between the first protection element F1 and the N connection terminal via a wire, the first capacitor C1 and the first varistor MOV1 are connected in parallel, a first common-mode inductor L1 is connected to the first protection element F1 via a wire, the first common-mode inductor L1 and the N connection terminal are connected via a wire, a second transient diode ZD2 is connected between the first common-mode inductor L1 and the GND connection terminal via a wire, a third transient diode ZD3 is connected between the first common-mode inductor L1 and the GND connection terminal via a wire, the third transient diode ZD3, the second transient diode ZD2, and the third capacitor C3 are connected in parallel, and the first transient diode ZD1, the second transient diode ZD2, and the third transient diode ZD3 cooperate to form a second protection circuit.
[0017] See also Figure 1The outside of the first common-mode inductor L1 is connected to the second common-mode inductor L2 through a wire, and the second capacitor C2, the fourth capacitor C4, the first transient diode ZD1, the first resistor R1 and the fifth capacitor C5 are connected in parallel between the first common-mode inductor L1 and the second common-mode inductor L2 through a wire. The outside of the second common-mode inductor L2 is connected to the third common-mode inductor L3 through a wire, and the second common-mode inductor L2 and the third common-mode inductor L3 are connected to the seventh capacitor C7 through a wire. The seventh capacitor C7 and the GND connection end are connected through a wire. The eighth capacitor C8 is connected between the second common-mode inductor L2 and the GND connection end through a wire. The eighth capacitor C8 and the seventh capacitor C7 are connected in parallel. The first capacitor C1, the first inductor L1, the second capacitor C2, the third capacitor C3, the third capacitor C7 and the fourth capacitor C8 are connected in parallel. The four capacitors C4 work together to form an LC filter module circuit. A sixth capacitor C6 is connected between the second common-mode inductor L2 and the third common-mode inductor L3 via a wire. The outer side of the third common-mode inductor L3 is connected to the connection end OUT1 and the connection end OUT2 via a wire. A ninth capacitor C9 is connected between the connection end OUT1 and the connection end OUT2 via a wire. The ninth capacitor C9 and the third common-mode inductor L3 are connected in parallel. The ninth capacitor C9 is used to filter out differential-mode noise signals in the mains current. A third capacitor C3 is connected between the first common-mode inductor L1 and the second common-mode inductor L2 via a wire. The third capacitor C3 is connected to the GND connection end via a wire. The third capacitor C3 is used to further filter out common-mode noise signals in the mains power supply signal.
[0018] The specific implementation process of the utility model is as follows: the second varistor MOV2 and the third varistor MOV3 form a common-mode surge protection module, thereby forming a first protection circuit to suppress the surge signal contained in the mains power supply; the first capacitor C1, the first inductor L1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 form an LC filter module circuit, which can filter out the common-mode signal and the differential-mode signal in the mains signal; the first transient diode ZD1, the second transient diode ZD2, and the third transient diode ZD3 form a second protection circuit, further suppressing the residual surge signal contained in the current output from the LC filter module; the transient diode The ability to withstand surge current impact is not as good as that of varistor, but it has a faster response time, so it is used as a secondary clamp voltage limiter. By utilizing the reverse avalanche characteristics of the transient suppression diode, the residual surge signal in the current output from the LC filter module can be released. In addition, when the first protection circuit fails, the second protection circuit can play a backup protection role, which can prevent the subsequent circuit from being impacted by the surge signal, and can further improve the safety of the system. When the normal current in the circuit flows through the second inductor L2, the current generates a reverse magnetic field in the inductor coil wound in the same phase and cancels each other out. At this time, the normal current is mainly affected by the coil current. The influence of the resistance (and a small amount of damping caused by leakage inductance), when a common-mode interference current flows through the second inductor L2, due to the unidirectionality of the common-mode current, a unidirectional magnetic field will be generated in the coil, which increases the inductive reactance of the coil, making the coil appear as a high impedance, and producing a strong damping effect, thereby attenuating the common-mode current and achieving the purpose of filtering out the common-mode noise signal. The first common-mode suppression circuit performs low-frequency noise suppression processing on the current output from the second protection circuit of the anti-surge circuit, and flows the current after the suppression processing into the second common-mode suppression circuit, thereby providing stable and pure current, lower electromagnetic interference, and can adapt to most electronic ballasts. The rectifier circuit ensures the normal operation of the subsequent circuit. When common-mode interference current flows through the third inductor L3, due to the unidirectionality of the common-mode current, a unidirectional magnetic field will be generated in the coil, which increases the inductive reactance of the coil, making the coil exhibit high impedance and producing a strong damping effect, thereby attenuating the common-mode current and filtering out the common-mode noise signal. It can solve the problem of poor versatility of other filtering circuits, not only improve the electromagnetic interference suppression level and safety of the system, but also prevent the circuit from being subjected to surge shock, so that the product can operate safely, avoid repeated design and reduce the selection of material models, and also reduce the cost of the entire circuit.
[0019] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An electronic ballast input end surge protection and electromagnetic compatibility suppression circuit, comprising a first protection element (F1), characterized in that: The outer side of the first protection element (F1) is connected to an L connection terminal via a wire, the outer side of the first protection element (F1) is connected to a first varistor (MOV1) via a wire, the outer side of the first varistor (MOV1) is connected to an N connection terminal via a wire, the outer side of the first protection element (F1) is connected to a second varistor (MOV2) via a wire, the outer side of the second varistor (MOV2) is connected to a GND connection terminal via a wire, a first capacitor (C1) is connected between the first protection element (F1) and the N connection terminal via a wire, the first capacitor (C1) and the first varistor (MOV1) are connected in parallel, and a first common-mode inductor (L1) is connected to the first protection element (F1) via a wire. The first common-mode inductor (L1) and the N connection terminal are connected via a wire; the outer side of the first common-mode inductor (L1) is connected to the second common-mode inductor (L2) via a wire; a second capacitor (C2), a fourth capacitor (C4), a first transient diode (ZD1), a first resistor (R1) and a fifth capacitor (C5) are connected in parallel between the first common-mode inductor (L1) and the second common-mode inductor (L2) via a wire; the outer side of the second common-mode inductor (L2) is connected to the third common-mode inductor (L3) via a wire; a sixth capacitor (C6) is connected between the second common-mode inductor (L2) and the third common-mode inductor (L3) via a wire; and the outer side of the third common-mode inductor (L3) is connected to the connection terminal OUT1 and the connection terminal OUT2 via a wire.
2. The electronic ballast input terminal surge protection and electromagnetic compatibility suppression circuit according to claim 1, characterized in that: The outer side of the N connection terminal is connected to a third varistor (MOV3) through a wire, and the third varistor (MOV3) and the GND connection terminal are connected through a wire.
3. The electronic ballast input terminal surge protection and electromagnetic compatibility suppression circuit according to claim 1, characterized in that: A second transient diode (ZD2) is connected between the first common-mode inductor (L1) and the GND connection end via a wire, a third transient diode (ZD3) is connected between the first common-mode inductor (L1) and the GND connection end via a wire, and the third transient diode (ZD3), the second transient diode (ZD2) and the third capacitor (C3) are connected in parallel.
4. The electronic ballast input terminal surge protection and electromagnetic compatibility suppression circuit according to claim 1, characterized in that: A seventh capacitor (C7) is connected between the second common-mode inductor (L2) and the third common-mode inductor (L3) via a wire, the seventh capacitor (C7) and the GND connection end are connected via a wire, an eighth capacitor (C8) is connected between the second common-mode inductor (L2) and the GND connection end via a wire, and the eighth capacitor (C8) and the seventh capacitor (C7) are connected in parallel.
5. The electronic ballast input terminal surge protection and electromagnetic compatibility suppression circuit according to claim 1, characterized in that: A ninth capacitor (C9) is connected between the connection terminal OUT1 and the connection terminal OUT2 via a wire, and the ninth capacitor (C9) and the third common-mode inductor (L3) are connected in parallel.
6. The electronic ballast input terminal surge protection and electromagnetic compatibility suppression circuit according to claim 1, characterized in that: A third capacitor (C3) is connected between the first common-mode inductor (L1) and the second common-mode inductor (L2) via a wire, and the third capacitor (C3) and a GND connection terminal are connected via a wire.