High-power high-frequency electronic ballast circuit with frequency jitter technology
The high-power high-frequency electronic ballast circuit using frequency jitter technology solves the acoustic resonance problem of high-pressure gas discharge lamps by utilizing a resonant ignition circuit and a DC-blocking capacitor, achieves stable lighting and extended electrode life, and reduces circuit complexity and cost.
Patent Information
- Application Number
- CN202422179069.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-09-05
AI Technical Summary
Existing high-pressure gas discharge lamps are prone to acoustic resonance during operation, resulting in light flickering, noise pollution and electrode aging. Existing electronic ballast circuits are complex and costly, making it difficult to effectively modulate the frequency.
The high-power high-frequency electronic ballast circuit adopts frequency jitter technology. Through the frequency jitter circuit and half-bridge drive circuit, the chip and components such as capacitors and inductors are used to form a resonant ignition circuit to generate high-voltage pulses to ignite the lamp. The frequency jitter is achieved in combination with DC blocking capacitors to avoid the overlap of natural frequencies.
It effectively suppresses acoustic resonance, ensures lighting stability, extends lamp life, reduces costs and simplifies circuit structure, and enables easy modulation of high-frequency electronic ballast frequency.
Smart Images
Figure CN223428593U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic ballasts, in particular to a high-power high-frequency electronic ballast circuit with frequency jitter technology. Background Art
[0002] High-pressure gas discharge lamps, such as high-pressure sodium lamps and metal halide lamps, have been widely used in many fields such as road lighting, industrial lighting, and stadium lighting due to their advantages of high luminous efficiency, long life, and high color rendering. They also have great advantages in areas such as plant supplementary lighting in agriculture.
[0003] The core components of a high-pressure gas discharge lamp include a sealed tube, two electrodes, and a specific gas mixture filling the tube. When a sufficiently high voltage is applied across the electrodes, the gas is ionized to form a plasma. Electrons, accelerated by the electric field, collide with gas atoms or molecules, exciting or ionizing them and releasing ultraviolet light. This ultraviolet light excites the phosphors on the tube's inner wall, converting them into visible light that radiates outward. However, acoustic resonance often occurs during the operation of high-pressure gas discharge lamps. This phenomenon is primarily caused by the interaction of the rapid expansion and contraction of the gas during the discharge, the vibration of the electrodes, and the inherent acoustic properties of the tube. When the discharge frequency approaches the inherent acoustic frequency of the tube and its internal gas, strong resonance occurs. Acoustic resonance can cause a number of serious problems. First, it can cause flickering in the light, affecting lighting quality. Second, the noise generated by acoustic resonance is not only uncomfortable but can also cause noise pollution to the surrounding environment. Furthermore, strong resonance accelerates the aging of the electrodes and tube, shortening the lamp's lifespan and increasing maintenance costs. Therefore, people have come up with many ways to prevent and reduce the occurrence of acoustic resonance. Electronic engineers and researchers have improved the circuits of high-frequency electronic ballasts. However, the circuits are often too complicated or the effect of acoustic resonance control is not obvious. Therefore, there is a need for improvement. Utility Model Content
[0004] The purpose of the utility model is to provide a high-power high-frequency electronic ballast circuit with frequency jitter technology, which solves the problems of high cost, complex circuit and difficulty in frequency modulation of the high-power high-frequency electronic ballast in the existing technology.
[0005] To achieve the above objectives, the present invention provides the following technical solutions: a high-power, high-frequency electronic ballast circuit with frequency jitter technology, comprising a frequency jitter circuit, a half-bridge drive circuit, and a half-bridge inverter circuit. The frequency jitter circuit is composed of a chip 1 and a resistor 1. The first pin of the chip 1 IC1 is connected to a +5V power supply via a wire, and the sixth pin of the chip 1 is connected to the resistor 1 via a wire. The half-bridge inverter circuit comprises a MOS transistor 1, a MOS transistor 2, a capacitor 4, a capacitor 5, an inductor 1, and a capacitor 6.
[0006] The half-bridge drive circuit includes resistor 2, capacitor 1, chip 2, capacitor 2, capacitor 3, inductor 1, inductor 2, resistor 3 and resistor 4. The sixth pin of chip 2 is connected to resistor 1 through a wire, the sixth pin of chip 2 is connected to resistor 2 through a wire, the other pin of resistor 2 is connected to signal ground, the fifth pin of chip 2 is connected to capacitor 1 through a wire, the other pin of capacitor 1 is connected to signal ground, the twelfth pin of chip 2 is connected to signal ground, the fourteenth pin of chip 2 is connected to capacitor 2 through a wire, the other pin of capacitor 2 is connected to the primary same-name terminal of inductor 1 through a wire, the eleventh pin of chip 2 is connected to capacitor 3 through a wire, the other pin of capacitor 3 is connected to the primary same-name terminal of inductor 2 through a wire, the opposite-name terminals of inductor 1 and inductor 2 are connected to signal ground, the secondary same-name terminal of inductor 1 is connected to resistor 3 through a wire, the other end of resistor 3 is connected to the gate of MOS tube 1 through a wire, the secondary same-name terminal of inductor 2 is connected to resistor 4 through a wire, and the other end of resistor 4 is connected to the gate of MOS tube 2 through a wire.
[0007] Preferably, the inductor 1 and capacitor 6 form a resonant ignition circuit. When the AC voltage output by the half-bridge inverter circuit is applied to the resonant ignition circuit composed of the inductor 1 and capacitor 6, resonance occurs at a specific frequency due to the characteristics of the inductor and capacitor. During the resonance process, the voltage across the capacitor increases rapidly, generating a high-voltage pulse sufficient to break down the gas inside the high-pressure gas discharge lamp, thereby igniting the MOS tube of the lamp and enabling normal operation of the high-pressure gas discharge lamp.
[0008] Preferably, the resistor 2 and the capacitor 1 are both oscillating resistors, which cooperate with the oscillator inside the chip 2 to determine the operating frequency of the electronic ballast, so that the chip outputs the operating frequency required for ballast.
[0009] Preferably, the secondary opposite-signal terminal of the first inductor is connected to the source of MOS transistor 1 via a wire, and the secondary same-signal terminal of the second inductor is connected to the source of MOS transistor 2. Both the first and second inductors are isolated drive inductors. Inductors 1 and 2 are primarily used to achieve electrical isolation, while also providing filtering and energy storage during drive signal transmission. Furthermore, the high-frequency drive signal output from the eleventh and fourteenth pins of chip 2 can drive MOS transistors 1 and 2 in the half-bridge inverter circuit via current-limiting resistors 3 and 4.
[0010] Preferably, both capacitor 2 and capacitor 3 are DC blocking capacitors, which allow the high-frequency drive signal output from the eleventh and fourteenth pins of chip 2 to pass normally. When the MOS transistors 1 and 2 in the ballast are turned on, current will pass through the DC blocking capacitors to charge the capacitors. In addition, when the MOS transistors 1 and 2 in the ballast are turned on, the capacitors will discharge through the load to form an AC signal. Due to the presence of the DC blocking capacitors, the DC signal cannot pass, while the AC signal can pass smoothly, thereby achieving the DC blocking function.
[0011] Preferably, the gate of MOS transistor 1 is connected to resistor 3 via a wire, the gate of MOS transistor 2 is connected to resistor 4 via a wire, and the source of MOS transistor 2 is connected to a power ground via a wire. The high-frequency drive signals generated from the eleventh and fourteenth pins of chip 2 are complementary signals that drive MOS transistors 1 and 2 in the half-bridge inverter circuit.
[0012] The beneficial effects of the present invention are as follows: the present invention uses a frequency jitter control circuit centered on chip one to provide a variable level control signal with a certain frequency to the half-bridge inverter output circuit driven by chip two, which is connected to the sixth pin of chip two, changes the working level of the sixth pin, and makes the high-frequency driving signals of the fourteenth and eleventh pins of chip two change continuously within a certain range; further, the working frequency of the high-power high-frequency electronic ballast half-bridge inverter circuit changes continuously within a certain range, jittering back and forth; at the same time, the working frequency of the high-pressure gas discharge lamp as a load changes continuously within a certain range, jittering back and forth, so that the output frequency will not be fixed at a certain frequency point, thereby avoiding overlap with the natural frequency of the half-bridge inverter circuit, making it impossible to form standing waves in the arc tube of the gas discharge lamp, effectively suppressing the acoustic resonance phenomenon, ensuring the stability of the light and the safety of the bulb. Therefore, the technology of the present invention has the advantages of low cost and simple circuit by combining with the single-chip microcomputer chip, and it is easy to realize the frequency modulation of the high-power high-frequency electronic ballast. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a principle block diagram of the utility model.
[0014] In the figure: 100, frequency jitter circuit; 200, half-bridge drive circuit; 300, half-bridge inverter circuit; IC1, chip one; IC2, chip two; C1, capacitor one; C2, capacitor two; C3, capacitor three; C4, capacitor four; C5, capacitor five; C6, capacitor six; L1, inductor one; L2, inductor two; R1, resistor one; R2, resistor two; R3, resistor three; R4, resistor four; Q1, MOS tube one; Q2, MOS tube two. DETAILED DESCRIPTION
[0015] The following will be combined with the 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 1 A high-power, high-frequency electronic ballast circuit with frequency jittering technology includes a frequency jittering circuit 100, a half-bridge drive circuit 200, and a half-bridge inverter circuit 300. The frequency jittering circuit 100 is composed of a chip IC1 and a resistor R1. The first pin of the chip IC1 is connected to a +5V power supply via a wire, and the sixth pin of the chip IC1 is connected to the resistor R1 via a wire. The half-bridge inverter circuit 300 includes a MOS transistor Q1, a MOS transistor Q2, a capacitor C4, a capacitor C5, an inductor L1, and a capacitor C6.
[0017] The half-bridge drive circuit 200 includes a resistor R2, a capacitor C1, a chip IC2, a capacitor C2, a capacitor C3, an inductor L1, an inductor L2, a resistor R3, and a resistor R4. The sixth pin of the chip IC2 is connected to the resistor R1 via a wire, the sixth pin of the chip IC2 is connected to the resistor R2 via a wire, the other pin of the resistor R2 is connected to the signal ground, the fifth pin of the chip IC2 is connected to the capacitor C1 via a wire, the other pin of the capacitor C1 is connected to the signal ground, the twelfth pin of the chip IC2 is connected to the signal ground, and the fourteenth pin of the chip IC2 is connected to the capacitor C2 via a wire. The other leg of capacitor C2 is connected to the primary like-name terminal of inductor L1 through a wire. The eleventh leg of chip IC2 is connected to capacitor C3 through a wire. The other leg of capacitor C3 is connected to the primary like-name terminal of inductor L2 through a wire. The opposite-name terminals of inductor L1 and inductor L2 are connected to signal ground. The secondary like-name terminal of inductor L1 is connected to resistor R3 through a wire. The other end of resistor R3 is connected to the gate of MOS tube Q1 through a wire. The secondary like-name terminal of inductor L2 is connected to resistor R4 through a wire. The other end of resistor R4 is connected to the gate of MOS tube Q2 through a wire.
[0018] See also Figure 1 Inductor L1 and capacitor C6 form a resonant ignition circuit. When the AC voltage output by half-bridge inverter circuit 300 is applied to the resonant ignition circuit formed by inductor L1 and capacitor C6, resonance occurs at a specific frequency due to the characteristics of the inductor and capacitor. During this resonance, the voltage across the capacitor rapidly increases, generating a high-voltage pulse sufficient to break down the gas inside the high-pressure gas discharge lamp, thereby igniting the lamp and enabling normal operation of the high-pressure gas discharge lamp. Resistor R2 and capacitor C1 are both oscillation resistors. Together with the oscillator within chip IC2, they determine the operating frequency of the electronic ballast, enabling the chip to output the required operating frequency for ballast operation.
[0019] See also Figure 1 The secondary opposite-signal terminals of inductor 1 L1 are connected to the source of MOS transistor 1 Q1 via a wire, while the secondary like-signal terminals of inductor 2 L2 are connected to the source of MOS transistor 2 Q2. Both inductor 1 L1 and inductor 2 L2 serve as isolated drive inductors. Inductors 1 L1 and 2 L2 primarily provide electrical isolation and also filter and store energy during drive signal transmission. High-frequency drive signals output from pins 11 and 14 of chip 2 IC2 are used to drive MOS transistors 1 Q1 and 2 Q2 in half-bridge inverter circuit 300 via current-limiting resistor 3 R3 and resistor 4 R4. Capacitors 2 C2 and 3 C3 are both DC-blocking capacitors. This allows the high-frequency drive signal output from pins 11 and 14 of chip 2, IC2, to pass normally. When MOS transistors Q1 and Q2 in the ballast are turned on, current flows through the DC blocking capacitor, charging the capacitor. Furthermore, when MOS transistors Q1 and Q2 in the ballast are turned on, the capacitor discharges through the load, forming an AC signal. Due to the DC blocking capacitor, the DC signal is blocked, while the AC signal passes smoothly, thus achieving the DC blocking function. The gate of MOS transistor Q1 is connected to resistor R3 via a wire, and the drain of MOS transistor Q1 is connected to PFC+. The gate of MOS transistor Q2 is connected to resistor R4 via a wire, and the source of MOS transistor Q2 is connected to power ground via a wire. The high-frequency drive signals generated from pins 11 and 14 of chip 2, IC2, are complementary signals that drive MOS transistors Q1 and Q2 in the half-bridge inverter circuit 300.
[0020] The specific implementation process of the utility model is as follows: the frequency jitter control circuit with chip 1 IC1 as the center provides a variable level control signal with a certain frequency to the half-bridge inverter output circuit driven by chip 2 IC2, which is connected to the sixth pin of chip 2 IC2, and changes the working level of the sixth pin, so that the high-frequency drive signal of the fourteenth and eleventh pins of chip 2 continuously changes within a certain range. By adjusting the frequency of the high-frequency drive signal, the half-bridge inverter circuit 300 works normally. In a switching cycle, when the high-frequency drive signal turns on the MOS tube Q1, Because the high-frequency drive signals are complementary, when MOS transistor Q2 is off, current flows from MOS transistor Q1 through inductor L1, charging capacitors C4 and C5, and generating a positive voltage across the high-pressure gas discharge lamp. When MOS transistor Q2 is on, current flows from MOS transistor Q2 through inductor L1, discharging capacitors C4 and C5, and generating a negative voltage across the high-pressure gas discharge lamp. By alternating between MOS transistors Q1 and Q2, the half-bridge inverter circuit 300 generates an AC voltage across the load. Simultaneously, inductor L1 and capacitor C6 form a resonant ignition circuit. When the AC voltage output by the half-bridge inverter circuit 300 is applied to the resonant ignition circuit formed by inductor L1 and capacitor C6, resonance occurs at a specific frequency due to the characteristics of the inductor and capacitor. During this resonance, the voltage across the capacitor rapidly increases, generating a high-voltage pulse sufficient to break down the gas within the high-pressure gas discharge lamp, thereby igniting the lamp and enabling normal operation of the high-pressure gas discharge lamp.
[0021] 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. A high-power high-frequency electronic ballast circuit with frequency jitter technology, comprising a frequency jitter circuit (100), a half-bridge drive circuit (200) and a half-bridge inverter circuit (300), characterized in that: The frequency jitter circuit (100) is composed of a chip 1 (IC1) and a resistor 1 (R1); the sixth pin of the chip 1 (IC1) is connected to the resistor 1 (R1) via a wire; and the half-bridge inverter circuit (300) comprises a MOS transistor 1 (Q1), a MOS transistor 2 (Q2), a capacitor 4 (C4), a capacitor 5 (C5), an inductor 1 (L1), and a capacitor 6 (C6); The half-bridge driving circuit (200) comprises a second resistor (R2), a first capacitor (C1), a second chip (IC2), a second capacitor (C2), a third capacitor (C3), a first inductor (L1), a second inductor (L2), a third resistor (R3) and a fourth resistor (R4); the sixth pin of the second chip (IC2) is connected to the first resistor (R1) via a wire, the sixth pin of the second chip (IC2) is connected to the second resistor (R2) via a wire, the other pin of the second resistor (R2) is connected to a signal ground, the fifth pin of the second chip (IC2) is connected to the first capacitor (C1) via a wire, the other pin of the first capacitor (C1) is connected to a signal ground, the twelfth pin of the second chip (IC2) is connected to a signal ground, and the fourteenth pin of the second chip (IC2) is connected to the second capacitor (R2) via a wire. (C2), the other leg of the capacitor 2 (C2) is connected to the primary same-name end of the inductor 1 (L1) through a wire, the eleventh leg of the chip 2 (IC2) is connected to the capacitor 3 (C3) through a wire, the other leg of the capacitor 3 (C3) is connected to the primary same-name end of the inductor 2 (L2) through a wire, the opposite-name ends of the inductor 1 (L1) and the inductor 2 (L2) are connected to the signal ground, the secondary same-name end of the inductor 1 (L1) is connected to the resistor 3 (R3) through a wire, the other end of the resistor 3 (R3) is connected to the gate of the MOS tube 1 (Q1) through a wire, the secondary same-name end of the inductor 2 (L2) is connected to the resistor 4 (R4) through a wire, and the other end of the resistor 4 (R4) is connected to the gate of the MOS tube 2 (Q2) through a wire.
2. The high-power high-frequency electronic ballast circuit with frequency dithering technology according to claim 1, characterized in that: The inductor 1 (L1) and the capacitor 6 (C6) form a resonant ignition circuit.
3. The high-power high-frequency electronic ballast circuit with frequency dithering technology according to claim 1, characterized in that: The resistor 2 (R2) and the capacitor 1 (C1) are both oscillation resistors.
4. The high-power high-frequency electronic ballast circuit with frequency dithering technology according to claim 1, characterized in that: The secondary opposite-name end of the inductor 1 (L1) is connected to the source of the MOS tube 1 (Q1) through a wire, and the secondary same-name end of the inductor 2 (L2) is connected to the source of the MOS tube 2 (Q2). Both the inductor 1 (L1) and the inductor 2 (L2) are isolated drive inductors.
5. The high-power high-frequency electronic ballast circuit with frequency dithering technology according to claim 1, characterized in that: The capacitor 2 (C2) and the capacitor 3 (C3) are both DC blocking capacitors.
6. The high-power high-frequency electronic ballast circuit with frequency dithering technology according to claim 1, characterized in that: The gate of the MOS transistor 1 (Q1) is connected to the resistor 3 (R3) through a wire, the gate of the MOS transistor 2 (Q2) is connected to the resistor 4 (R4) through a wire, and the source of the MOS transistor 2 (Q2) is connected to the power ground through a wire.