A multi-driven electronic rectifier

Abstract

This invention relates to a driving circuit for ultraviolet lamps, specifically a multi-drive electronic rectifier. The multi-drive electronic rectifier includes a main circuit and a ignition circuit. The main circuit includes a first switching transistor Q1, a second switching transistor Q2, a bridge rectifier, a bidirectional diode BD2, and a coil T1. Coil T1 comprises three coils: a first coil, a second coil, and a third coil, all with iron cores. The ignition circuit includes an interconnecting circuit and a direct-connection circuit. The interconnecting circuit includes a fourth capacitor C4, and the direct-connection circuit includes a fifth capacitor C5, a first diode D1, a seventh resistor R7, an eighth resistor R8, and a light-emitting diode D2. This invention adds energy storage capacitors and resistors to the ignition circuit to store energy, maintaining a high-voltage state for the unlit lamps and ultimately ensuring the normal driving of the series-connected ultraviolet lamps.

Description

Technical Field

[0001] This invention relates to the driving circuit of ultraviolet lamp tubes, specifically a multi-drive electronic rectifier. Background Technology

[0002] Due to disinfection requirements, ethylene purifiers and cold storage purification devices require ultraviolet disinfection on both the upper and lower layers of the product, along with the laying of sterilization materials. Traditionally, each ethylene purifier or cold storage purification device uses two ultraviolet lamps, requiring two rectifiers. Therefore, m ethylene purifiers and n cold storage purification devices would require 2m + 2n ultraviolet lamps, necessitating 2m + 2n rectifiers. Each ultraviolet lamp requires four leads, totaling 8m + 8n leads. Therefore, using traditional rectifiers to drive the ultraviolet lamps has certain limitations, primarily:

[0003] a) Conventional UV lamp rectifiers can only drive one lamp. When used in ethylene purifiers and cold storage purification devices, there are many rectifiers, the wiring is complicated, the circuit board is expensive, and it occupies a lot of space.

[0004] b) Driving 4 UV lamps requires 16 external leads, which results in a large number of leads and relatively low manufacturability and reliability. Summary of the Invention

[0005] In order to solve the problem that the high-frequency oscillation circuit of the electronic rectifier cannot drive multiple ultraviolet lamps, the present invention provides a multi-drive electronic rectifier.

[0006] The present invention is achieved by the following technical solution: A multi-drive electronic rectifier, including a main circuit and a start-up circuit. The main circuit includes a first switching transistor Q1, a second switching transistor Q2, a bridge rectifier, a bidirectional diode BD2, and a coil T1. The coil T1 includes a first coil, a second coil, and a third coil, all of which have iron cores.

[0007] The bridge rectifier's input serves as the input to the electronic rectifier. The bridge rectifier's output connects to the second filter capacitor C101 and the first filter capacitor C1. The positive terminal of the first filter capacitor C1 is connected to the anode of the third diode D3 through the first resistor R1. The anode of the third diode D3 is also grounded through the second capacitor C2. The anode of the third diode D3 is also connected to the cathode of the bidirectional diode BD2. The anode of the bidirectional diode BD2 is connected to the cathode of the fourth diode D4. The anode of the fourth diode D4 is grounded. The anode of the bidirectional diode BD2 is connected to the base of the first switching transistor Q1. The anode of the bidirectional diode BD2 is also connected to one end of the first coil in coil T1 through the third resistor R3. The collector of the first switching transistor Q1 is connected to the cathode of the third diode D3. The collector of the first switching transistor Q1 is also connected to the fifth diode D5 and the second switching transistor Q2. The base is connected, the emitter of the first switching transistor Q1 is grounded through the second resistor R2, the collector of the second switching transistor Q2 is connected to the positive terminal of the first filter capacitor C1, the collector is connected to one end of the third coil in coil T1 through the third capacitor C3, the fifth resistor R5 is connected in parallel across the third capacitor C3, the collector is also connected to pin 1 of the first output connector J1 through the eighth capacitor C8, the ninth capacitor C9 is also connected in parallel across the eighth capacitor C8, the emitter is connected to one end of the third coil in coil T1 through the fourth resistor R4, the base is connected to the other end of the third coil in coil T1 through the sixth resistor R6, the other end of the first coil in coil T1 is grounded, one end of the second coil in coil T1 is connected to pin 2 of the first output connector J1 through the first inductor L1, and the other end of the second coil is connected to the base of the second switching transistor Q2 through the fifth diode D5.

[0008] The Qihui circuit includes an interconnect circuit and a direct-connect circuit. The interconnect circuit includes a fourth capacitor C4. The direct-connect circuit includes a fifth capacitor C5, a first diode D1, a seventh resistor R7, an eighth resistor R8, and a light-emitting diode D2. Pin 1 of UV lamp 1 is connected to pin 1 of the first output connector J1. Pin 2 of UV lamp 1 is connected to pin 2 of UV lamp 2 via the fourth capacitor C4. Pin 1 of UV lamp 2 is connected to pin 2 of the first output connector J1. Pins 3 and 4 of UV lamp 1 are connected... The pin is connected to pin 4 of UV lamp 2 through capacitor C5. Pins 3 and 4 of UV lamp 2 are connected. Pin 3 of UV lamp 2 is connected to pin 4 of UV lamp 1 through resistor R7. Pin 3 of UV lamp 2 is also connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to pin 4 of UV lamp 1. Pin 4 of UV lamp 1 is also connected to the anode of LED D2 through resistor R8. The cathode of LED D2 is connected to pin 3 of UV lamp 2.

[0009] The direct-connect circuit and the interconnect circuit constitute the ignition circuit for the UV lamp. The fourth capacitor C4 (high-voltage capacitor) in the interconnect circuit continuously charges before the UV lamp ignites. When it reaches the ignition voltage of one UV lamp (approximately 400-600V), one UV lamp ignites. The inert gas inside is broken down, at which point the UV lamp can be considered a 500-ohm resistor. The other UV lamp is not broken down, and the fourth capacitor C4 continues to charge until it can break down the other UV lamp. Meanwhile, the fifth capacitor C5 in the direct-connect circuit is also charged, making the ignition more reliable. After both lamps are lit, the fourth capacitor C4 becomes ineffective, and can be considered a resistor of approximately 1KΩ. At this point, the inductor in the main circuit provides the necessary current.

[0010] The aforementioned multi-drive electronic rectifier further includes a second output connector J2. One end of the second coil is connected to pin 2 of the second output connector J2 via a second inductor L2. Pin 1 of the second output connector J2 is connected to the collector of the first capacitor C108 and the second switching transistor Q2 via a first capacitor C109 connected in parallel across the two ends of the first capacitor C108. The second output connector J2 is connected to another set of ignition circuits.

[0011] The present invention has the following advantages:

[0012] a) Add energy storage capacitors (fourth capacitor C4, fifth capacitor C5), resistors and other devices to the ignition circuit to store energy, maintain the high voltage state of the unlit lamp tubes, and ultimately ensure that the series-connected ultraviolet lamp tubes are driven normally.

[0013] b) Add an LED driver circuit to the series terminal, and use the voltage difference between the two sets of ultraviolet lamps to light up the LEDs and achieve the purpose of prompting. Attached Figure Description

[0014] Figure 1 This is the circuit schematic diagram of the present invention. Detailed Implementation

[0015] This invention relates to a multi-drive electronic rectifier developed for use in ethylene purifiers and cold storage purification devices employing multiple ultraviolet lamps. This electronic rectifier can simultaneously drive two groups of four ultraviolet lamps. A block diagram illustrating its working principle is attached. Figure 1 .

[0016] The electronic rectifier has a main circuit and a start-up circuit. The main circuit includes a first switching transistor Q1, a second switching transistor Q2, a bridge rectifier, a bidirectional diode BD2, and a coil T1. The coil T1 includes three coils: a first coil, a second coil, and a third coil. All three coils have iron cores.

[0017] The bridge rectifier's input serves as the input to the electronic rectifier. The bridge rectifier's output connects to the second filter capacitor C101 and the first filter capacitor C1. The positive terminal of the first filter capacitor C1 is connected to the anode of the third diode D3 through the first resistor R1. The anode of the third diode D3 is also grounded through the second capacitor C2. The anode of the third diode D3 is also connected to the cathode of the bidirectional diode BD2. The anode of the bidirectional diode BD2 is connected to the cathode of the fourth diode D4. The anode of the fourth diode D4 is grounded. The anode of the bidirectional diode BD2 is connected to the base of the first switching transistor Q1. The anode of the bidirectional diode BD2 is also connected to one end of the first coil in coil T1 through the third resistor R3. The collector of the first switching transistor Q1 is connected to the cathode of the third diode D3. The collector of the first switching transistor Q1 is also connected to the base of the second switching transistor Q2 through the fifth diode D5. The emitter of the first switching transistor Q1 is grounded through the second resistor R2. The collector of the second switching transistor Q2 is connected to the positive terminal of the first filter capacitor C1. The collector is connected to one end of the third coil in coil T1 via the third capacitor C3. The fifth resistor R5 is connected in parallel across the two ends of the third capacitor C3. The collector is also connected to pin 1 of the first output connector J1 via the eighth capacitor C8. The ninth capacitor C9 is also connected in parallel across the two ends of the eighth capacitor C8. The emitter is connected to one end of the third coil in coil T1 via the fourth resistor R4. The base is connected to the other end of the third coil in coil T1 via the sixth resistor R6. The other end of the first coil in coil T1 is grounded. One end of the second coil in coil T1 is connected to pin 2 of the first output connector J1 via the first inductor L1. The other end of the second coil is connected to the base of the second switch Q2 via the fifth diode D5. One end of the second coil is also connected to pin 2 of the second output connector J2 via the second inductor L2. Pin 1 of the second output connector J2 is connected to the collector of the second switch Q2 via the first zero-eight capacitor C108. The first zero-nine capacitor C109 is connected in parallel across the two ends of the first zero-eight capacitor C108.

[0018] In the main circuit, the bridge rectifier, the second filter capacitor C101, and the first filter capacitor C1 rectify the input AC power into DC. The first switch Q1, the second switch Q2, the second capacitor C2, and the third capacitor C3 form a passive branch. The circuit path for the lamp load is provided by the eighth capacitor C8, the ninth capacitor C9, the first zero-eight capacitor C108, and the first zero-nine capacitor C109. The third resistor R3, the second capacitor C2, and the bidirectional diode BD2 form the starting circuit. The first switch Q1 and the second switch Q2 are important components of the oscillation circuit and also function as power switches.

[0019] After the second filter capacitor C101 and the first filter capacitor C1 are charged, the first resistor R1 charges the second capacitor C2. When the charging voltage exceeds the turnaround voltage of the bidirectional diode BD2, the bidirectional diode BD2 avalanche breakdown occurs, and the second capacitor C2 discharges to the base of the first switching transistor Q1, causing Q1 to turn on in the forward direction. After the first switching transistor Q1 turns on, an induced electromotive force is generated across the coil T1, increasing the base current and collector current, thereby raising the base potential of the first switching transistor Q1, and eventually bringing the first switching transistor Q1 into saturation.

[0020] After the first switch Q1 is turned off, the electromotive force at the ends of the second and third coils of coil T1 simultaneously drives the collector and base of the second switch Q2 to charge, causing the second switch Q2 to conduct in the forward direction. The fifth resistor R5 charges the third capacitor C3. When the charge accumulates to a certain level, the first inductor L1 and the second inductor L2 operate, generating a certain voltage to start the UV lamp. The inductors provide the required supply voltage and current for the UV lamp. After the inductors discharge to a certain level, Q2 is turned off, and the charging of Q1 restarts. The entire circuit board continuously repeats the cycle of Q1 charging-Q1 turning off-Q2 charging-inductor discharging-Q1 charging, thus achieving UV lamp illumination. The product operates at a frequency of approximately 30kHz, which is the flickering frequency of the UV lamp. The human eye can only perceive flickering frequencies below 50Hz; frequencies above 50Hz are imperceptible to the human eye, so the flickering of the UV lamp will not cause discomfort to the human eye.

[0021] The Qihui circuit includes an interconnect circuit and a direct-connect circuit. The interconnect circuit includes a fourth capacitor C4. The direct-connect circuit includes a fifth capacitor C5, a first diode D1, a seventh resistor R7, an eighth resistor R8, and a light-emitting diode D2. Pin 1 of UV lamp 1 is connected to pin 1 of the first output connector J1. Pin 2 of UV lamp 1 is connected to pin 2 of UV lamp 2 via the fourth capacitor C4. Pin 1 of UV lamp 2 is connected to pin 2 of the first output connector J1. Pins 3 and 4 of UV lamp 1 are connected... The pin is connected to pin 4 of UV lamp 2 through capacitor C5. Pins 3 and 4 of UV lamp 2 are connected. Pin 3 of UV lamp 2 is connected to pin 4 of UV lamp 1 through resistor R7. Pin 3 of UV lamp 2 is also connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to pin 4 of UV lamp 1. Pin 4 of UV lamp 1 is also connected to the anode of LED D2 through resistor R8. The cathode of LED D2 is connected to pin 3 of UV lamp 2.

[0022] The first output connector J2 is connected to another ignition circuit using the same connection method.

[0023] The direct-connect circuit and the interconnect circuit constitute the ignition circuit for the UV lamp. The fourth capacitor C4 (high-voltage capacitor) in the interconnect circuit continuously charges before the UV lamp ignites. When it reaches the ignition voltage of one UV lamp (approximately 400-600V), one UV lamp ignites. The inert gas inside is broken down, at which point the UV lamp can be considered a 500-ohm resistor. The other UV lamp is not broken down, and the fourth capacitor C4 continues to charge until it can break down the other UV lamp. Meanwhile, the fifth capacitor C5 in the direct-connect circuit is also charged, making the ignition more reliable. After both lamps are lit, the fourth capacitor C4 becomes ineffective, and can be considered a resistor of approximately 1KΩ. At this point, the inductor in the main circuit provides the necessary current.

[0024] Energy storage and illumination indicator circuit principle: The ignition voltage of a normal UV lamp is around 500V. It achieves luminescence by continuously applying high voltage across the lamp and heating the filament, thus ionizing the internal inert gas. However, when lamps are connected in series, only the filament of one lamp can be heated, reducing the heating efficiency by 50% and affecting the ignition effect. Therefore, a capacitor (fourth capacitor C4) needs to be added to the series connection to ensure normal heating of the filament. However, if the capacitor is too large, the voltage of the ignition circuit will be too high, causing the original ignition circuit to break down. If the capacitor is too small, it will not meet the energy storage requirements. This voltage was tested multiple times using an NF-grade capacitor to achieve normal ignition capability. After the two UV lamps break down, the voltage drop across the UV lamps drops to around 50V, and the internal resistance can be considered to be around 500 ohms. An LED driver circuit is added to the series connection, using the voltage difference between the two UV lamps to illuminate the LED (light-emitting diode D2), achieving the indicator purpose.

[0025] Inductor circuit principle: During the continuous oscillation of the oscillating circuit, inductors L1 and L2 are charged to provide the required current to the UV lamp. Adding an inductor L2 increases the load on coil T1 and the transistor. Therefore, a higher-power transistor and coil are selected from the original circuit to meet the current load requirements of the newly added inductor L2.

Claims

1. A multi-drive electronic rectifier, comprising a main circuit and an ignition circuit, wherein the main circuit comprises a first switching transistor Q1, a second switching transistor Q2, a bridge rectifier, a bidirectional diode BD2, and a coil T1, wherein the coil T1 comprises three coils: a first coil, a second coil, and a third coil, all of which have iron cores; The bridge rectifier's input serves as the input to the electronic rectifier. The bridge rectifier's output is connected to the second filter capacitor C101 and the first filter capacitor C1. The positive terminal of the first filter capacitor C1 is connected to the anode of the third diode D3 through the first resistor R1. The anode of the third diode D3 is also grounded through the second capacitor C2. The anode of the third diode D3 is also connected to the cathode of the bidirectional diode BD2. The anode of the bidirectional diode BD2 is connected to the cathode of the fourth diode D4. The anode of the fourth diode D4 is grounded. The anode of the bidirectional diode BD2 is connected to the base of the first switching transistor Q1. The anode of the bidirectional diode BD2 is also connected to one end of the first coil in coil T1 through the third resistor R3. The collector of the first switching transistor Q1 is connected to the cathode of the third diode D3. The collector of the first switching transistor Q1 is also connected to the fifth diode D5 and the second switching transistor Q2. The base is connected, the emitter of the first switching transistor Q1 is grounded through the second resistor R2, the collector of the second switching transistor Q2 is connected to the positive terminal of the first filter capacitor C1, the collector is connected to one end of the third coil in coil T1 through the third capacitor C3, the fifth resistor R5 is connected in parallel across the third capacitor C3, the collector is also connected to pin 1 of the first output connector J1 through the eighth capacitor C8, the ninth capacitor C9 is also connected in parallel across the eighth capacitor C8, the emitter is connected to one end of the third coil in coil T1 through the fourth resistor R4, the base is connected to the other end of the third coil in coil T1 through the sixth resistor R6, the other end of the first coil in coil T1 is grounded, one end of the second coil in coil T1 is connected to pin 2 of the first output connector J1 through the first inductor L1, and the other end of the second coil is connected to the base of the second switching transistor Q2 through the fifth diode D5. Its features are: The Qihui circuit includes an interconnect circuit and a direct-connect circuit. The interconnect circuit includes a fourth capacitor C4. The direct-connect circuit includes a fifth capacitor C5, a first diode D1, a seventh resistor R7, an eighth resistor R8, and a light-emitting diode D2. Pin 1 of UV lamp 1 is connected to pin 1 of the first output connector J1. Pin 2 of UV lamp 1 is connected to pin 2 of UV lamp 2 via the fourth capacitor C4. Pin 1 of UV lamp 2 is connected to pin 2 of the first output connector J1. Pins 3 and 4 of UV lamp 1 are connected... The pin is connected to pin 4 of UV lamp 2 through capacitor C5. Pins 3 and 4 of UV lamp 2 are connected. Pin 3 of UV lamp 2 is connected to pin 4 of UV lamp 1 through resistor R7. Pin 3 of UV lamp 2 is also connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to pin 4 of UV lamp 1. Pin 4 of UV lamp 1 is also connected to the anode of LED D2 through resistor R8. The cathode of LED D2 is connected to pin 3 of UV lamp 2.

2. The multi-drive electronic rectifier according to claim 1, characterized in that: It also includes a second output connector J2. One end of the second coil is connected to the second output connector J2 via the second inductor L2. Pin 1 of the second output connector J2 is connected to the collector of the second switching transistor Q2 via the first capacitor C108. The two ends of the first capacitor C108 are connected in parallel with the first capacitor C109. The second output connector J2 is connected to another set of start-up circuits.

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