An electronic ballast

Abstract

The invention relates to an electronic ballast, belonging to the technical field of ballasts, and is used to extend the service life of a four-pin light source. The electronic ballast comprises a signal generating module for outputting a periodic trigger signal and an oscillating power supply module for outputting a periodic power supply signal with opposite phases under the action of the trigger signal. Under the action of the periodic power supply signal with opposite phases, the magnitudes of the voltage and current connected or output by four pins of the four-pin light source are equal, so that the luminous efficiency of four joints of the four-pin light source is equal, the utilization rate of the four-pin light source is improved, the possibility of the four-pin light source being damaged in advance due to a large local burden is reduced, and the service life of the four-pin light source is extended.

Description

Technical Field

[0001] The present invention relates to the technical field of ballasts, and in particular to an electronic ballast. Background Art

[0002] An electronic ballast is an electronic device that uses electronic technology to drive a light source to produce the required light.

[0003] An existing common light source driven by an electronic ballast is an ultraviolet lamp, which includes a first joint, a second joint, a third joint, and a fourth joint, wherein a resistance wire is connected between the first joint and the second joint, and between the third joint and the fourth joint. When the electronic ballast is used to drive the ultraviolet lamp for disinfection and sterilization, it is necessary to generate a high voltage between the two resistance wires in the ultraviolet lamp to break through the air to discharge and emit light, such as current flowing in from the first joint and the second joint, and flowing out from the third joint and the fourth joint.

[0004] Based on the above-mentioned working principle of the ultraviolet lamp, in the process of the ultraviolet lamp emitting light for sterilization and disinfection, since the four joints of the ultraviolet lamp are basically exactly the same and the two resistance wires are also basically exactly the same, during the emitting work process, taking the above-mentioned current flow direction as an example, if the current flowing into the first joint and the second joint are not equal, and the current flowing out of the third joint and the fourth joint are not equal, it will cause the work burden of the four joints and the corresponding part of the resistance wire close to the four joints to be different. The joints and some resistance wires with heavier burdens will have a shorter service life, resulting in the ultraviolet lamp being damaged prematurely due to heavier local burdens during operation and the shortened service life of the ultraviolet lamp. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an electronic ballast. When the electronic ballast drives the four-pin light source to emit light, the workload of each joint and each part of the resistance wire is equal, thereby reducing the possibility that a joint or a part of the resistance wire of the four-pin light source is relatively heavily loaded with work, locally damaged in advance, and the service life of the four-pin light source is shortened.

[0006] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0007] An electronic ballast is used to drive a four-pin light source, wherein the four-pin light source comprises a first joint, a second joint, a third joint, a fourth joint and two resistance wires, wherein two ends of one resistance wire are respectively coupled to the first joint and the second joint, and two ends of another resistance wire are respectively coupled to the third joint and the fourth joint; the electronic ballast comprises:

[0008] A signal generating module, used for outputting a preheating trigger signal and / or a working trigger signal, the preheating trigger signal includes a first trigger signal and a second trigger signal, the working trigger signal includes a third trigger signal and a fourth trigger signal, the first trigger signal, the second trigger signal, the third trigger signal, and the fourth trigger signal are respectively output by a first signal generating terminal, a second signal generating terminal, a third signal generating terminal, and a fourth signal generating terminal;

[0009] An oscillation power supply module, comprising a first receiving end, a second receiving end, a third receiving end, a fourth receiving end and a first power supply end, a second power supply end, a third power supply end, and a fourth power supply end, wherein the first receiving end, the second receiving end, the third receiving end, and the fourth receiving end are respectively coupled to the first signal generating end, the second signal generating end, the third signal generating end, and the fourth signal generating end, and respectively receive the first trigger signal, the second trigger signal, the third trigger signal, and the fourth trigger signal, so as to output a first supply voltage signal in response to the first trigger signal, output a second supply voltage signal in response to the second trigger signal, output a third supply voltage signal in response to the third trigger signal, and output a fourth supply voltage signal in response to the fourth trigger signal;

[0010] The first supply voltage signal and the second supply voltage signal are both expressed as follows: the output signals of the first power supply terminal and the second power supply terminal are equal in magnitude and opposite in potential, the output signals of the third power supply terminal and the fourth power supply terminal are equal in magnitude and opposite in potential, and the output signals of the first power supply terminal and the third power supply terminal are equal in magnitude;

[0011] The third supply voltage signal and the fourth supply voltage signal are both expressed as the output signals of the first power supply end and the second power supply end, the third power supply end and the fourth power supply end are respectively equal in magnitude and have the same potential, and the output signal of the first power supply end and the output signal of the third power supply end are equal in magnitude and have opposite potentials; and the output signal of the first power supply end in the third supply voltage signal and the fourth supply voltage signal is equal in magnitude and has opposite potentials;

[0012] The first connector, the second connector, the third connector and the fourth connector of the four-pin light source are respectively coupled to the first power supply end, the second power supply end, the third power supply end and the fourth power supply end to receive the first supply voltage signal, the second supply voltage signal, the third supply voltage signal or the fourth supply voltage signal.

[0013] By adopting the above technical solution, the signal generating module outputs a preheating trigger signal and a working trigger signal, the preheating trigger signal includes a first trigger signal and a second trigger signal, and the working trigger signal includes a third trigger signal and a fourth trigger signal, so that the oscillation power supply module outputs a first supply voltage signal, a second supply voltage signal, a third supply voltage signal, and a fourth supply voltage signal in sequence accordingly, and the four-pin light source periodically accesses the first supply voltage signal, the second supply voltage signal, the third supply voltage signal, and the fourth supply voltage signal, and the first supply voltage signal and the second supply voltage signal are inverted, the third supply voltage signal and the fourth supply voltage signal are inverted, and the magnitudes of the signals accessed by the first connector, the second connector, the third connector, and the fourth connector are always equal, so the four connectors of the four-pin light source have equal working opportunities, that is, the corresponding four connectors and part of the resistance wire in the four-pin light source have the same working burden, which improves the utilization rate of the four-pin light source, makes the four-pin light source emit light more evenly, reduces the possibility of premature damage of the four-pin light source due to a large local burden, and extends the service life of the four-pin light source.

[0014] Furthermore, the signal generating module comprises:

[0015] a preheating signal generating unit, configured to output the preheating trigger signal, wherein the preheating trigger signal includes the first trigger signal having a high level for half a cycle and a low level for half a cycle, and a second trigger signal having an inverted phase with the first trigger signal;

[0016] A working signal trigger unit, used for outputting the working trigger signal, wherein the working trigger signal includes the third trigger signal with a high level for half a cycle and a low level for half a cycle and a fourth trigger signal with an inverted phase with the third trigger signal;

[0017] A state control unit is used to output a state trigger signal to trigger the preheating signal generating unit and the working signal generating unit to work periodically and alternately, or the working signal generating unit starts to work after the preheating signal generating unit works for a preset time, or the working signal generating unit starts to work after the preheating signal generating unit works for a preset time and the preheating signal generating unit works intermittently, or the preheating signal generating unit starts to work intermittently and the working signal generating unit starts to work at the same time.

[0018] Further, the preheating signal generating unit includes a first square wave signal generating unit and a first signal inverting unit, the output end of the first square wave signal generating unit is coupled to the first signal generating end so that the first signal generating end outputs the first trigger signal, and the output end of the first square wave signal generating unit is connected to the second receiving end through the first signal inverting unit so that the second signal generating end outputs the second trigger signal;

[0019] The working signal generating unit comprises a second square wave signal generating unit and a second signal inverting unit, the output end of the second square wave signal generating unit is coupled to the third signal generating end so that the third signal generating end outputs the second trigger signal, and the output end of the second square wave signal generating unit is connected to the fourth signal generating end through the second signal inverting unit so that the fourth signal generating end outputs the fourth trigger signal;

[0020] The state control unit includes a control signal generating unit and a third signal inverting unit. The control signal generating unit is used to output a working signal that triggers the first square wave signal generating unit and the second signal generating unit to work for a preset duration. The output end of the control signal generating unit is coupled to the trigger end of the first square wave signal generating unit and is connected to the trigger end of the second square wave signal generating unit through the third inverter to trigger the second square wave signal generating unit to work after the preset duration.

[0021] Furthermore, the signal generating module comprises:

[0022] A fundamental wave signal generating unit, whose output end serves as the first signal generating end, and is used to generate the first trigger signal with a high level in the first quarter cycle and a low level in the last three quarters cycle;

[0023] A first phase lag unit, whose output end is used as the second signal generating end, coupled to the fundamental signal generating unit, receives the first trigger signal, and outputs the second trigger signal whose phase lags behind a quarter of a period of the first trigger signal;

[0024] A second phase lag unit, whose output end serves as the third signal generating end, is coupled to the first phase lag unit, receives the second trigger signal, and outputs the third trigger signal whose phase lags behind a quarter of a period of the second trigger signal;

[0025] The third phase lag unit has an output end serving as the fourth signal generating end, is coupled to the second phase lag unit, receives the third trigger signal, and outputs the fourth trigger signal whose phase lags behind a quarter of a cycle of the third trigger signal.

[0026] Furthermore, the oscillating power supply module includes:

[0027] A voltage oscillation module, comprising the first receiving end, the second receiving end, the third receiving end, the fourth receiving end and the first output end, the second output end, the third output end, and the fourth output end, wherein the voltage oscillation module outputs a first voltage signal at the first output end in response to a first trigger signal, outputs a second voltage signal at the second output end in response to a second trigger signal, outputs a third voltage signal at the third output end in response to a third trigger signal, and outputs a fourth voltage signal at the fourth output end in response to a fourth trigger signal;

[0028] The voltage transformer and current slowing module includes a first input terminal, a second input terminal, a third input terminal, and a fourth input terminal respectively coupled to the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal to respectively receive the first voltage signal, the second voltage signal, the third voltage signal, and the fourth voltage signal, and also includes the first power supply terminal, the second power supply terminal, the third power supply terminal, and the fourth power supply terminal which respectively respond to the first voltage signal, the second voltage signal, the third voltage signal, and the fourth voltage signal to output the first supply voltage signal, the second supply voltage signal, the third supply voltage signal, and the fourth supply voltage signal.

[0029] Further, the voltage oscillation module includes a first half-bridge switch unit, a second half-bridge switch unit, a first capacitor energy storage unit, and a second capacitor energy storage unit; the first half-bridge switch unit and the second half-bridge switch unit are connected in parallel to the power supply;

[0030] The first half-bridge switch unit includes a first switch element and a second switch element connected in series, and the second half-bridge switch unit includes a third switch element and a fourth switch element connected in series;

[0031] The triggering ends of the first switch element, the second switch element, the third switch element and the fourth switch element serve as the first receiving end, the second receiving end, the third receiving end and the fourth receiving end respectively;

[0032] The node where the first switch element and the second switch element are coupled serves as the first output terminal, one end of the first capacitor energy storage unit is coupled to the negative pole of the power supply, and the other end serves as the second output terminal, the node where the third switch element and the fourth switch element are coupled serves as the third output terminal, and one end of the second capacitor energy storage unit is coupled to the negative pole of the power supply, and the other end serves as the fourth output terminal.

[0033] Furthermore, the first capacitor energy storage unit and the fourth capacitor energy storage unit respectively include a second capacitor and a fourth capacitor, one end of the second capacitor is coupled to the negative pole of the power supply and the other end serves as the second output end, and one end of the fourth capacitor is coupled to the positive pole of the power supply and the other end serves as the fourth output end.

[0034] Furthermore, the first capacitor energy storage unit further includes a first capacitor having one end coupled to the positive electrode of the power supply and the other end coupled to the second output end;

[0035] And / or the second capacitor energy storage unit also includes a third capacitor having one end coupled to the positive pole of the power supply and the other end coupled to the fourth output end.

[0036] Furthermore, the voltage transformation and current slowing module includes a first transformer and a second transformer; the primary side of the first transformer includes a first coil, and the auxiliary side includes a second coil and a third coil with equal number of turns and the same winding direction, and the second coil and the third coil are coupled at opposite ends close to each other; the primary side of the second transformer includes a fourth coil, and the auxiliary side includes a fifth coil and a sixth coil with equal number of turns and the same winding direction, and the fifth coil and the sixth coil are coupled at opposite ends far away from each other; the first coil is coupled to the opposite ends of the fourth coil;

[0037] The other end of the first coil serves as the first receiving end, the other end of the fourth coil serves as the second input end, and the node where the second coil and the third coil are coupled, and the node where the fifth coil and the sixth coil are coupled serve as the third input end and the fourth input end respectively;

[0038] The opposite ends of the second coil and the third coil which are far from each other serve as the first power supply end and the second power supply end respectively, and the opposite ends of the fifth coil and the sixth coil which are close to each other serve as the third power supply end and the fourth power supply end respectively.

[0039] Furthermore, the voltage transformation and current slowing module further comprises a leading buffer module, which comprises a seventh coil in the first transformer, the number of turns of which is much larger than the first coil, the second coil and the third coil, and an eighth coil in the second transformer, the number of turns of which is much larger than the fourth coil, the fifth coil and the sixth coil;

[0040] The dominant buffer module also includes a first current release unit and a second current release unit for absorbing the induced current generated in the seventh coil and the eighth coil respectively when the signal generating module outputs the first trigger signal, and a connection release unit for connecting the first current release unit and the second current release unit and for releasing the induced current absorbed by the first current release unit and the second current release unit.

[0041] In summary, the present invention includes at least one of the following beneficial technical effects:

[0042] 1. The signal generation module triggers the oscillation power supply module to provide the four-pin light source with mutually inverted signals in timing, so that the circuit size connected to or flowing out of the four connectors of the four-pin light source is the same, so that the utilization rate of each connector and each part of the resistance wire of the four-pin light source is the same, reducing the possibility of the four-pin light source being damaged in advance due to a large local burden, and extending the service life of the four-pin light source;

[0043] 2. A signal generation module is composed of one signal generation unit and three phase lag units, which reduces the number of signal sources and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of a circuit structure in Embodiment 1 of the present invention;

[0045] Figure 2 It is a structural schematic diagram of a signal generating module in the second embodiment of the present invention.

[0046] In the figure, 1. signal generating module; 11. fundamental wave signal generating unit; 12. first phase lag unit; 13. second phase lag unit; 14. third phase lag unit; 14. preheating signal generating unit; 141. first square wave signal generating unit; 142. first signal inverting unit; 15. working signal generating unit; 151. second square wave signal generating unit; 152. second signal inverting unit; 16. state control unit; 161. control signal generating unit; 162. third signal inverting unit; 2. oscillation power supply module; 21. voltage oscillation module; 211. first half-bridge switch unit; 212. second half-bridge switch unit; 213. first capacitor energy storage unit; 214. second capacitor energy storage unit; 22. voltage transformation and current slowing module; 23. leading buffer module; 231. first current release unit; 232. second current release unit; 233. connection release unit. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0048] Embodiment 1:

[0049] Reference Figure 1An electronic ballast is used to drive a four-pin ultraviolet lamp LAMP to work. The electronic ballast includes a signal generating module 1 for outputting a periodic trigger signal and an oscillating power supply module 2 for outputting a periodic power supply signal with opposite phases under the action of the trigger signal. The periodic power supply signal with opposite phases makes the four joints of the ultraviolet lamp LAMP have the same size of input or output, so that the work load of each joint and each part of the resistance wire of the ultraviolet lamp LAMP is equal, thereby improving the utilization rate of the ultraviolet lamp LAMP, reducing the possibility of premature damage of the ultraviolet lamp LAMP due to a large local load, and thus prolonging the service life of the ultraviolet lamp LAMP.

[0050] The signal generating module 1 includes a fundamental wave signal generating unit 11 for generating a few wave signals with a high level in the first quarter cycle and a low level in the last three quarter cycles, and a first phase lag unit 12, a second phase lag unit 13 and a third phase lag unit for outputting the signal output by the fundamental wave signal generating unit 11 with a phase lag. The trigger end of the fundamental wave signal generating unit 11 is coupled to the power supply and switching circuit of the electronic ballast and the fundamental wave signal generating unit 11 starts to work when the electronic ballast is started. The coupling method is a conventional technical means of those skilled in the art and will not be further introduced here. Specifically, the fundamental wave signal generating unit 11 can be coupled to the positive pole of the power supply through a key switch, and the opening and closing of the fundamental wave signal generating unit can be controlled by the key switch.

[0051] In a specific embodiment, the fundamental wave signal generating unit 11 is configured as a square wave signal generator. The square wave signal generator is used to output a periodic signal with a high level in the first quarter cycle and a low level in the last three quarters cycle. This is a conventional technical means for those skilled in the art. The period size of the fundamental wave signal can be set according to actual application needs and will not be introduced here. The output end of the fundamental wave signal generating unit 11 is coupled to the first signal generating end so that the first signal generating end outputs a fundamental wave signal, i.e., a first trigger signal.

[0052] The first phase lag unit 12, the second phase lag unit 13, and the third phase lag unit can all be set as a delay circuit composed of a 555 timer and its external delay circuit. The circuit that realizes the delay function through the 555 timer is a conventional circuit topology structure, and setting the delay time of the 555 delay circuit to a specified time of one quarter of a cycle is a conventional application of the 555 delay circuit, which will not be introduced in detail.

[0053] The first phase lag unit 12 is coupled to the fundamental signal generating unit 11 to receive the above-mentioned first trigger signal, and the output end is coupled to the second signal generating end so that the second signal generating end outputs a second trigger signal whose phase lags behind a quarter of a period of the first trigger signal; the second phase lag unit 13 is coupled to the first phase lag unit 12 to receive the above-mentioned second trigger signal, and the output end is coupled to the third signal generating end so that the third signal generating end outputs a third trigger signal whose phase lags behind a quarter of a period of the second trigger signal; the third phase lag unit 14 is coupled to the second phase lag unit 13 to receive the above-mentioned third trigger signal, and the output end is coupled to the third signal generating end so that the third signal generating end outputs a fourth trigger signal whose phase lags behind a quarter of a period of the third trigger signal. It can be achieved that the second trigger signal phase lags behind the first trigger signal by a quarter of a period, the third trigger signal phase lags behind the second trigger signal by a quarter of a period, and the fourth trigger signal phase lags behind the third trigger signal by a quarter of a period, and the output of four periodic signals whose phases lag in sequence is achieved through a single signal source, thereby reducing the number of signal sources, having a simple structure, and being convenient to set up.

[0054] Of course, the first phase lag unit 12, the second phase lag unit 13, and the third phase lag unit may also be set as other delay circuits or the delay logic may be set by a program, which will not be listed and introduced one by one here.

[0055] The oscillating power supply module 2 comprises a voltage oscillating module 21 for outputting periodic voltage signals which are opposite to each other in phase, and a voltage transformation and current slowing module 22 for outputting the voltage signals in a slow current.

[0056] The voltage oscillation module 21 includes a first half-bridge switch unit 211 , a second half-bridge switch unit 212 , a first capacitor energy storage unit 213 , and a second capacitor energy storage unit 214 .

[0057] The first half-bridge switch unit 211 includes a first switch element and a second switch element connected in series, and the second half-bridge switch unit 212 includes a third switch element and a fourth switch element connected in series. In this embodiment, the first switch element, the second switch element, the third switch element, and the fourth switch element are respectively set to be N-channel depletion type MOS transistors Q1, MOS transistors Q2, MOS transistors Q3, and MOS transistors Q4, the source of the MOS transistor Q1 is coupled to the positive power supply, the drain is coupled to the source of the MOS transistor Q2, and the drain of the MOS transistor Q2 is coupled to the negative power supply; the source of the MOS transistor Q3 is coupled to the source of the MOS transistor Q1, the drain is coupled to the source of the MOS transistor Q4, and the drain of the MOS transistor Q4 is coupled to the drain of the MOS transistor Q2. The first capacitor energy storage unit 213 includes a first capacitor C1 and a second capacitor C2 connected in series, and the second capacitor energy storage unit 214 includes a third capacitor C3 and a fourth capacitor C4 connected in series. An end of the first capacitor C1 away from the second capacitor C2 and an end of the third capacitor C3 away from the fourth capacitor C4 are both coupled to the source of the MOS tube Q1, and an end of the second capacitor C2 away from the first capacitor C1 and an end of the fourth capacitor C4 away from the third capacitor C3 are both coupled to the drain of the MOS tube Q2.

[0058] The gates of the MOS transistors Q1, Q2, Q3, and Q4 are respectively coupled to the first signal generating end, the second signal generating end, the third signal generating end, and the fourth signal generating end to respectively receive the first trigger signal, the second trigger signal, the third trigger signal, and the fourth trigger signal, that is, they respectively serve as the first receiving end, the second receiving end, the third receiving end, and the fourth receiving end of the voltage oscillation module 21. The drain of the MOS transistor Q1, the node where the first capacitor C1 and the second capacitor C2 are coupled, the drain of the MOS transistor Q3, and the node where the third capacitor C3 and the fourth capacitor C4 are coupled output the first voltage signal, the second voltage signal, the third voltage signal, and the fourth voltage signal, that is, they respectively serve as the first output end, the second output end, the third output end, and the fourth output end of the voltage oscillation module 21.

[0059] The voltage transformation and current slowing module 22 includes a first transformer T1 and a second transformer T2. The first transformer T1 includes a primary first coil L1 and two sections of secondary coils L2 and L3 with equal turns. The second transformer T2 includes a primary fourth coil L4 and two sections of secondary coils L5 and L6 with equal turns. In this embodiment, the first coil L1, the second coil L2, the third coil L3 and the fourth coil L4, the fifth coil L5, and the sixth coil L6 have equal turns and the same winding direction, respectively. The second coil L2 and the third coil L3 have the same winding direction as the first coil L1 and their lengths are equal to half of the first coil L1. The second coil L2 and the third coil L3 are coupled at opposite ends close to each other, the fifth coil L5 and the sixth coil L6 are coupled at opposite ends far away from each other, and the first coil L1 and the fourth coil L4 are of equal length and coupled at opposite ends.

[0060] One end of the first coil L1 away from the fourth coil L4, the end of the fourth coil L4 away from the first coil L1, the node where the second coil L2 and the third coil L3 are coupled, and the node where the fifth coil L5 and the sixth coil L6 are coupled are respectively coupled to the above-mentioned first output terminal, second output terminal, third output terminal, and fourth output terminal to respectively receive the above-mentioned first voltage signal, second voltage signal, third voltage signal, and fourth voltage signal, that is, to respectively serve as the first input terminal, second input terminal, third input terminal, and fourth input terminal of the voltage transformer and current buffer module 22.

[0061] The other vacant ends of the second coil L2, the third coil L3, the fifth coil L5 and the sixth coil L6 are respectively used as the first power supply end, the second power supply end, the third power supply end and the fourth power supply end of the voltage transformer and current buffer module 22, for outputting the first supply voltage signal, the second supply voltage signal, the third supply voltage signal or the fourth supply voltage signal.

[0062] The ultraviolet lamp tube LAMP includes a first connector, a second connector, a third connector, and a fourth connector which are arranged in sequence, a first resistor is arranged between the first connector and the second connector, a second resistor is arranged between the third connector and the fourth connector, and the first connector, the second connector, the third connector, and the fourth connector are respectively coupled to the first power supply end, the second power supply end, the third power supply end, and the fourth power supply end to receive the first supply voltage signal, the second supply voltage signal, the third supply voltage signal, or the fourth supply voltage signal.

[0063] It should be pointed out that in order to avoid different current losses during the transmission of current on wires of different lengths, the above power supply is set to a constant current source. Compared with the constant voltage source power supply, the setting of the constant current source avoids the change in current caused by changes in wire length.

[0064] The implementation principle of this embodiment is: after the electronic ballast is started,

[0065] The signal generating module 1 outputs a first trigger signal, a second trigger signal, a third trigger signal, and a fourth trigger signal whose phases lag behind a quarter of a cycle in sequence, so that the MOS transistors Q1, Q2, Q3, and Q4 are turned on in the first quarter cycle, the second quarter cycle, the third quarter cycle, and the fourth quarter cycle in sequence.

[0066] In the first quarter cycle, the MOS tube Q1 is turned on, and the current flows from the positive electrode of the power supply through the MOS tube Q1, the first coil L1, and the fourth coil L4 in sequence to charge the end of the second capacitor C2 away from the negative electrode of the power supply, and the other end of the second capacitor C2 discharges to the negative electrode of the power supply. The second coil L2 generates a current from the end away from the third coil L3 to the end coupled to the third coil L3, and the third coil L3 generates a current from the end coupled to the second coil L2 to the end away from the second coil L2. The fifth coil L5 generates a current from the end coupled to the sixth coil L6 to the end close to the sixth coil L6, and the sixth coil L6 generates a current from the end close to the fifth coil L5 to the end coupled to the fifth coil L5, that is, the first joint, the second joint, the third joint, and the fourth joint of the ultraviolet lamp tube LAMP output, connect, connect, and output current and voltage respectively.

[0067] In the second quarter cycle, the MOS tube Q2 is turned on, the second capacitor C2 is discharged, and the current flows from the end of the second capacitor C2 far from the negative electrode of the power supply through the fourth inductor L4, the first inductor L1, the MOS tube Q2 to the negative electrode of the power supply in sequence. At the same time, the other end of the second capacitor C2 discharges to the negative electrode of the power supply, and the second coil L2 generates a current from the end coupled to the third coil L3 to the end far from the third coil L3, and the third coil L3 generates a current from the end far from the second coil L2 to the end coupled to the second coil L2. The fifth coil L5 generates a current from the end close to the sixth coil L6 to the end coupled to the sixth coil L6, and the sixth coil L6 generates a current from the end coupled to the fifth coil L5 to the end close to the fifth coil L5, that is, the first connector, the second connector, the third connector, and the fourth connector of the ultraviolet lamp tube LAMP are connected, output, output, and connected to the current respectively.

[0068] In the first quarter cycle and the second quarter cycle, since the first coil L1 and the fourth coil L4 have the same length, that is, the inductance and resistance of the two are the same, and the second coil L2, the third coil L3, the fifth coil L5, and the sixth coil L6 have the same length, the current connected to or flowing into the first joint, the second joint, the third joint, and the fourth joint of the ultraviolet lamp tube LAMP is equal, that is, the current passing through the two resistance wires of the ultraviolet lamp tube LAMP is equal, that is, the two resistance wires of the ultraviolet lamp tube LAMP are heated by the same overcurrent, which further reduces the possibility of inconsistent work loads of the two resistance wires of the ultraviolet lamp tube LAMP, thereby further reducing the possibility that a certain resistance wire of the ultraviolet lamp tube LAMP has a large work load and is damaged in advance, thereby further extending the service life of the ultraviolet lamp tube LAMP. In this process, the inductance of the first coil L1, the second coil L2, the third coil L3, the fourth coil L4, the fifth coil L5, and the sixth coil L6 will give the current a slow flow effect, reducing the possibility of the ultraviolet lamp tube LAMP being damaged by too fast current changes in the ultraviolet lamp tube LAMP. In addition, when the power is first turned on, the positive electrode of the power supply needs to charge the first capacitor C1. Combined with the slow-current effect of the coil, the ultraviolet lamp LAMP can be preheated under the action of a more slowly increasing current, acting as a starter and further reducing the possibility of damage to the ultraviolet lamp LAMP.

[0069] In the third quarter cycle, the MOS tube Q3 is turned on, and the current flows from the positive electrode of the power supply through the MOS tube Q3 to the node where the second coil L2 and the third coil L3 are coupled, and is equally divided, and flows into the first joint and the second joint of the ultraviolet lamp tube LAMP respectively from the opposite ends of the second coil L2 and the third coil L3 that are far away from each other, and then flows out from the third joint and the fourth joint of the ultraviolet lamp tube LAMP to the opposite ends of the fifth coil L5 and the sixth coil L6 that are close to each other, and converges at the node where the fifth coil L5 and the sixth coil L6 are coupled to flow to the end of the fourth capacitor C4 away from the negative electrode of the power supply, so as to charge the end of the fourth capacitor C4 away from the negative electrode of the power supply, and at the same time, the other end of the fourth capacitor C4 is discharged to the negative electrode of the power supply.

[0070] In the fourth quarter cycle, the MOS tube Q4 is turned on, the fourth capacitor C4 is discharged, and the current flows from the end of the fourth capacitor C4 away from the negative electrode of the power supply to the node where the fifth coil L5 and the sixth coil L6 are coupled, and the current is equally divided, and flows to the third joint and the fourth joint of the ultraviolet lamp LAMP at the opposite ends of the fifth coil L5 and the sixth coil L6 close to each other, and then flows out from the first joint and the second joint to the opposite ends of the second coil L2 and the third coil L3 away from each other, and flows through the MOS tube Q4 at the node where the second coil L2 and the third coil L3 are coupled to the negative electrode of the power supply.

[0071] In the third quarter cycle and the fourth quarter cycle, similarly, since the first coil L1 and the fourth coil L4 are of the same length, that is, the inductance and resistance of the two are the same, and the second coil L2, the third coil L3, the fifth coil L5, and the sixth coil L6 are of equal length, the currents connected to or flowing into the first joint, the second joint, the third joint, and the fourth joint of the ultraviolet lamp tube LAMP are equal, that is, the efficiency of emitting electrons at the four joints of the ultraviolet lamp tube LAMP is the same, so that the work load of the ultraviolet lamp tube LAMP is evenly distributed, avoiding the possibility of partial premature damage caused by excessive local work load of the ultraviolet lamp tube LAMP, and extending the service life of the ultraviolet lamp tube LAMP. In addition, when the power is first turned on, the positive electrode of the power supply needs to charge the first capacitor C1 and the third capacitor C3, and the slow flow effect of the above coils enables the ultraviolet lamp tube LAMP to be preheated under the action of a more slowly increasing current, playing the role of a starter, and further reducing the possibility of damage to the ultraviolet lamp tube LAMP.

[0072] Furthermore, the transformer and current-slowing module 22 also includes a leading buffer module 23, which plays a major role in slowing down the current direction change of the first transformer T1 and the second transformer T2, so as to avoid excessive current changes in the first coil L1, the second coil L2, the third coil L3 in the first transformer T1 and the fourth coil L4, the fifth coil L5, and the sixth coil L6 in the second transformer T2.

[0073] Specifically, the leading buffer module 23 includes a seventh coil L7 in the first transformer T1, whose number of turns is much larger than the first coil L1, the second coil L2, and the third coil L3, and an eighth coil L8 in the second transformer T2, whose number of turns is much larger than the fourth coil L4, the fifth coil L5, and the sixth coil L6. The seventh coil L7 and the eighth coil L8 are respectively wound in the same direction as the second coil L2 and the fifth coil L5. The seventh coil L7 and the eighth coil L8 have a large number of turns, and can play a major role in buffering the direction change of the magnetic field of the first transformer T1 and the second transformer T2. The seventh coil L7 and the eighth coil L8 have the same number of turns, so that the seventh coil L7 and the eighth coil L8 have the same buffering effect on the current, keep the current or induced current in the other coils of the first transformer T1 and the second transformer T2 consistent, and further keep the voltage and current connected to the four joints of the ultraviolet lamp tube LAMP equal.

[0074] The leading buffer module 23 further includes a first current releasing unit 231 for releasing the induced current in the seventh coil L7 and a second current releasing unit 232 for releasing the induced current in the eighth coil L8 within the first quarter cycle.

[0075] The first current release unit 231 includes a first diode D1, a first fixed resistor R1, and a fifth capacitor C5. The anode of the first diode D1 is coupled to one end of the seventh coil L7, the cathode is coupled to one end of the first fixed resistor R1, the other end of the first fixed resistor R1 is coupled to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 and the other end of the seventh coil L7 are both coupled to the negative electrode of the power supply.

[0076] The second current release unit 232 includes a second diode D2, a second fixed resistor R2, and a third fixed resistor R3. The anode of the second diode D2 is coupled to one end of the eighth coil L8, the cathode is coupled to one end of the second fixed resistor R2, the other end of the second fixed resistor R2 is coupled to the negative electrode of the power supply through the third fixed resistor R3, and the other end of the eighth coil L8 is also coupled to the negative electrode of the power supply.

[0077] The first current release unit 231 and the second current release unit 232 can release the induced current generated in the seventh coil L7 and the eighth coil L8 respectively in the first quarter cycle, that is, they play a leading buffering role in the current change in the first quarter cycle, mainly avoiding the current change of the first transformer T1 and the second transformer T2 from the non-working state, that is, no current to the current generation process, and avoiding the resistance wire in the ultraviolet lamp LAMP from no current to current generation too quickly to damage the resistance wire.

[0078] Preferably, the leading buffer module 23 further includes a connection release unit 233 which connects the first current release unit 231 and the second current release unit 232 to release the electric energy generated by the fifth capacitor C5 in the first current release unit 231 .

[0079] The connection release unit 233 includes a sixth capacitor C6 and a fourth fixed resistor R4. One end of the sixth capacitor C6 is coupled to the end of the third fixed resistor R3 away from the second fixed resistor R2, and the other end is coupled to the end of the first fixed resistor R1 away from the first diode D1 through the fourth fixed resistor R4. In the first quarter cycle, an induced current is generated in both the seventh coil L7 and the eighth coil L8. The induced current generated in the seventh coil L7 charges the ends of the fifth capacitor C5 and the sixth capacitor C6 away from the negative electrode of the power supply, and the induced current generated in the eighth coil L8 charges the end of the sixth capacitor C6 close to the negative electrode of the power supply. Since the induced currents generated in the seventh coil L7 and the eighth coil L8 are the same, the charge amount of the seventh coil L7 to the fifth capacitor C5 and the sixth capacitor C6 can be offset by the charge amount of the eighth coil L8 to the sixth capacitor C6, thereby realizing the discharge of the fifth capacitor C5 and the sixth capacitor C6. After the discharge of the fifth capacitor C5 and the sixth capacitor C6 is completed, they can continue to be invested in the suppression of the current conversion of the first transformer T1 and the second transformer T2.

[0080] In the above working process, the dominant buffer module 23 can act as a starter and can play a dominant role in the magnetic field of the first transformer T1 and the second transformer T2, thereby preventing the current of the resistor in the ultraviolet lamp tube LAMP from increasing too quickly and causing damage to the resistor, and also preventing the magnetic fields of the first coil L1, the second coil L2 and the third coil L3 from influencing each other, and the magnetic fields of the fourth coil L4, the fifth coil L5 and the sixth coil L6 from influencing each other.

[0081] Embodiment 2:

[0082] Reference Figure 1 and Figure 2 The difference between this embodiment and the first embodiment is that:

[0083] The signal generating module 1 comprises a preheating signal generating unit 14 for outputting a preheating trigger signal, a working signal generating unit 15 for outputting a working trigger signal, and a state control unit 16 for controlling the working states of the preheating signal generating unit 14 and the working signal generating unit 15 .

[0084] The preheating signal generating unit 14 and the working signal generating unit 15 include two completely identical square wave signal generators that output a high level in the first half cycle and a low level in the second half cycle. The preheating signal generating unit 14 and the working signal generating unit 15 also include a first inverter A1 and a second inverter A2, respectively. The output end of the square wave signal generator in the preheating signal generating unit 14 is connected to the first receiving end of the voltage oscillation module 21 and is connected to the second receiving end of the voltage oscillation module 21 through the first inverter A1, and the output end of the square wave generator in the working signal generating unit 15 is connected to the third receiving end of the voltage oscillation module 21 and is connected to the fourth receiving end of the voltage oscillation module 21 through the second inverter A2, so that the MOS transistors Q1 and MOS transistors Q2, MOS transistors Q3 and MOS transistors Q4 in the voltage oscillation module 21 are connected to trigger signals of opposite phases, that is, when the preheating signal generating unit 14 is working, the MOS transistors Q1 and MOS transistors Q2 are alternately turned on, and when the working signal generating unit 15 is working, the MOS transistors Q3 and MOS transistors Q4 are alternately turned on. Based on the principle introduction in the first embodiment, when the preheating signal generating unit 14 is working, an alternating current with a frequency consistent with the trigger signal period flows through the two resistance wires of the ultraviolet lamp tube LAMP, thereby realizing the preheating of the ultraviolet lamp tube LAMP; when the working signal generating unit 15 is working, a pressure difference is generated between the two resistance wires of the ultraviolet lamp tube LAMP, and the air is broken down to discharge, thereby realizing the luminescence of the ultraviolet lamp tube LAMP; and based on the principle introduction in the first embodiment, the working burden of each joint and each part of the resistance wire of the ultraviolet lamp tube during the preheating and luminescence process is the same, thereby avoiding the possibility of excessive local load on the ultraviolet lamp tube causing premature damage and reducing the working life of the ultraviolet lamp tube LAMP.

[0085] The state control unit 16 can be set as a signal controller of a state control signal in any form, which is connected to the triggering end of the square wave signal generator in the preheating signal generating unit 14 and the working signal generating unit 15 through two output ends, so as to trigger the preheating signal sounding unit 14 and the working signal generating unit 15 to work in any form, that is, trigger the ultraviolet lamp LAMP to preheat or emit light. The preheating and lighting of the ultraviolet lamp LAMP can be in any form, such as preheating for a preset time, and then alternating between preheating (the resistance wire is energized and continued to heat) and lighting, or preheating for a preset time and then starting to emit light, and intermittently preheating (the resistance wire is energized and continued to heat) during the lighting process to maintain the resistance wire temperature of the ultraviolet lamp LAMP, or starting to work and preheating intermittently at the same time, etc., which are not listed one by one here, and are only explained with the following examples.

[0086] In the example, the state control unit 16 first triggers the preheating signal generating unit 14 to work for a preset time and then stops and starts to trigger the working signal sound generating unit 15 to start working.

[0087] The state control unit 16 includes a timer and a third inverter A3.

[0088] The trigger end of the timer 161 is coupled to the power supply switch circuit of the electronic ballast, and the timer 161 starts working when the electronic ballast is started. The coupling method is a conventional technical means of those skilled in the art and will not be further introduced here. Specifically, the trigger end of the timer 161 can be connected to the positive pole of the power supply through a key switch to control the start and stop of the timer 161 through the key switch.

[0089] The output terminal of the timer 161 is coupled to the trigger terminal of the square wave signal generator in the preheating signal generating unit 14 and is coupled to the trigger terminal of the square wave signal generator in the working signal generating unit 15 through the third inverter A3. The timer 161 outputs a high level signal of a preset duration, and the square wave signal generator starts to work when the two trigger terminals of the square wave signal generator are connected to a high level.

[0090] The timer 161 first outputs a high-level signal of a preset duration, triggering the preheating signal generating unit 14 to work for the preset duration, that is, the ultraviolet lamp LAMP performs a preheating operation for the preset duration, and then the timer 161 outputs a low-level signal, the preheating signal generating unit 14 stops working and the working signal generating unit 15 starts working, and the ultraviolet lamp LAMP enters a working state, thereby realizing the state control that the ultraviolet lamp LAMP is first preheated for a preset duration and then works.

[0091] Of course, the process of the signal generating module 1 outputting the square wave signal and state control can also be set as a program or other functional circuit based on principle, which can be realized by conventional technical means of those skilled in the art and will not be introduced here one by one.

[0092] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic ballast for driving a four-pin light source, wherein the four-pin light source comprises a first connector, a second connector, a third connector, and a fourth connector; characterized in that: The electronic ballast comprises: A signal generating module (1) is used to output a preheating trigger signal and a working trigger signal, the preheating trigger signal includes a first trigger signal and a second trigger signal, the working trigger signal includes a third trigger signal and a fourth trigger signal, the first trigger signal, the second trigger signal, the third trigger signal and the fourth trigger signal are outputted by a first signal generating terminal, a second signal generating terminal, a third signal generating terminal and a fourth signal generating terminal respectively; An oscillation power supply module (2), comprising a first receiving end, a second receiving end, a third receiving end, a fourth receiving end and a first power supply end, a second power supply end, a third power supply end, and a fourth power supply end, wherein the first receiving end, the second receiving end, the third receiving end, and the fourth receiving end are respectively coupled to the first signal generating end, the second signal generating end, the third signal generating end, and the fourth signal generating end, and respectively receive the first trigger signal, the second trigger signal, the third trigger signal, and the fourth trigger signal; The first supply voltage signal and the second supply voltage signal are both expressed as follows: the output signals of the first power supply terminal and the second power supply terminal are equal in magnitude and opposite in potential, the output signals of the third power supply terminal and the fourth power supply terminal are equal in magnitude and opposite in potential, and the output signals of the first power supply terminal and the third power supply terminal are equal in magnitude; The third supply voltage signal and the fourth supply voltage signal are both characterized in that the output signals of the first power supply end and the second power supply end, and the third power supply end and the fourth power supply end are respectively equal in magnitude and have the same potential, and the output signal of the first power supply end and the output signal of the third power supply end are equal in magnitude and opposite in direction; and the output signal of the first power supply end in the third supply voltage signal and the fourth supply voltage signal are equal in magnitude and opposite in direction; The first connector, the second connector, the third connector and the fourth connector of the four-pin light source are respectively coupled to the first power supply end, the second power supply end, the third power supply end and the fourth power supply end to receive the first supply voltage signal, the second supply voltage signal, the third supply voltage signal or the fourth supply voltage signal; A voltage oscillation module (21), comprising the first receiving end, the second receiving end, the third receiving end, the fourth receiving end and the first output end, the second output end, the third output end, and the fourth output end, wherein the voltage oscillation module (21) outputs a first voltage signal at the first output end in response to a first trigger signal, outputs a second voltage signal at the second output end in response to a second trigger signal, outputs a third voltage signal at the third output end in response to a third trigger signal, and outputs a fourth voltage signal at the fourth output end in response to a fourth trigger signal; A voltage transformation and current slowing module (22), comprising a first input terminal, a second input terminal, a third input terminal, and a fourth input terminal respectively coupled to the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal to respectively receive the first voltage signal, the second voltage signal, the third voltage signal, and the fourth voltage signal, and also comprising the first power supply terminal, the second power supply terminal, the third power supply terminal, and the fourth power supply terminal which output the first supply voltage signal, the second supply voltage signal, the third supply voltage signal, and the fourth supply voltage signal in response to the first voltage signal, the second voltage signal, the third voltage signal, and the fourth voltage signal; The voltage transformation and current slowing module (22) comprises a first transformer and a second transformer; the primary side of the first transformer comprises a first coil, the secondary side comprises a second coil and a third coil having the same number of turns and the same winding direction, and the second coil and the third coil are coupled at opposite ends close to each other; the primary side of the second transformer comprises a fourth coil, the secondary side comprises a fifth coil and a sixth coil having the same number of turns and the same winding direction, and the fifth coil and the sixth coil are coupled at opposite ends far from each other; the first coil is coupled to the fourth coil at opposite ends; The other end of the first coil serves as the first input end, the other end of the fourth coil serves as the second input end, and the node where the second coil and the third coil are coupled, and the node where the fifth coil and the sixth coil are coupled serve as the third input end and the fourth input end respectively; The opposite ends of the second coil and the third coil that are far from each other serve as the first power supply end and the second power supply end respectively, and the opposite ends of the fifth coil and the sixth coil that are close to each other serve as the third power supply end and the fourth power supply end respectively; The signal generating module (1) comprises: A preheating signal generating unit (14) is used to output the preheating trigger signal, wherein the preheating trigger signal includes the first trigger signal having a high level for half a cycle and a low level for half a cycle, and a second trigger signal having an inverse phase with the first trigger signal; A working signal trigger unit, used for outputting the working trigger signal, wherein the working trigger signal includes the third trigger signal with a high level for half a cycle and a low level for half a cycle and a fourth trigger signal with an inverted phase with the third trigger signal; A state control unit (16) is used to output a state trigger signal to trigger the preheating signal generating unit (14) and the working signal generating unit (15) to work periodically and alternately, or the preheating signal generating unit (14) works for a preset time and then the working signal generating unit (15) starts working, or the preheating signal generating unit (14) works for a preset time and then the working signal generating unit (15) starts working and the preheating signal generating unit (14) works intermittently, or the preheating signal generating unit (14) starts working intermittently and at the same time the working signal generating unit (15) starts working.

2. The electronic ballast according to claim 1, characterized in that: The preheating signal generating unit (14) comprises a first square wave signal generating unit (141) and a first signal inverting unit (142), wherein an output end of the first square wave signal generating unit (141) is coupled to the first signal generating end so that the first signal generating end outputs the first trigger signal, and an output end of the first square wave signal generating unit (41) is connected to the second signal generating end through the first signal inverting unit (142) so that the second signal generating end outputs the second trigger signal; The working signal generating unit (15) comprises a second square wave signal generating unit (151) and a second signal inverting unit (152), wherein an output end of the second square wave signal generating unit (151) is coupled to the third signal generating end so that the third signal generating end outputs the third trigger signal, and the second square wave signal generating unit (151) is connected to the fourth signal generating end through the second signal inverting unit (152) so that the fourth signal generating end outputs the fourth trigger signal; The state control unit (16) comprises a control signal generating unit (161) and a third signal inverting unit (162), wherein the control signal generating unit (161) is used to output a working signal of a preset duration to trigger the first square wave signal generating unit (141) to operate, and the output end of the control signal generating unit (161) is coupled to the trigger end of the first square wave signal generating unit (141) and is connected to the trigger end of the second square wave signal generating unit (151) through the third signal inverting unit (162) to trigger the second square wave signal generating unit (152) to operate after the preset duration.

3. The electronic ballast according to claim 1, characterized in that: The signal generating module (1) comprises: A fundamental wave signal generating unit (11), the output end of which serves as the first signal generating end, and is used to generate the first trigger signal with a high level in the first quarter cycle and a low level in the last three quarters cycle; A first phase lag unit (12), whose output end serves as the second signal generating end, is coupled to the fundamental wave signal generating unit (11), receives the first trigger signal, and outputs the second trigger signal whose phase lags behind a quarter of a period of the first trigger signal; A second phase lag unit (13), whose output end serves as the third signal generating end, is coupled to the first phase lag unit (12), receives the second trigger signal, and outputs the third trigger signal whose phase lags behind a quarter of a period of the second trigger signal; The third phase lag unit (14) has an output end serving as the fourth signal generating end, is coupled to the second phase lag unit (13), receives the third trigger signal, and outputs the fourth trigger signal whose phase lags behind a quarter of a cycle of the third trigger signal.

4. The electronic ballast according to claim 1, characterized in that: The voltage oscillation module (21) comprises a first half-bridge switch unit (211), a second half-bridge switch unit (212), a first capacitor energy storage unit (213), and a second capacitor energy storage unit (214); the first half-bridge switch unit (211) and the second half-bridge switch unit (212) are connected in parallel to a power supply; The first half-bridge switch unit (211) comprises a first switch element and a second switch element connected in series, and the second half-bridge switch unit (212) comprises a third switch element and a fourth switch element connected in series; The triggering ends of the first switch element, the second switch element, the third switch element and the fourth switch element serve as the first receiving end, the second receiving end, the third receiving end and the fourth receiving end respectively; The node where the first switch element and the second switch element are coupled serves as the first output terminal, one end of the first capacitor energy storage unit (213) is coupled to the negative electrode of the power supply, and the other end serves as the second output terminal, the node where the third switch element and the fourth switch element are coupled serves as the third output terminal, and one end of the second capacitor energy storage unit (214) is coupled to the negative electrode of the power supply, and the other end serves as the fourth output terminal.

5. The electronic ballast according to claim 4, characterized in that: The first capacitor energy storage unit (213) and the second capacitor energy storage unit (214) respectively comprise a second capacitor and a fourth capacitor, wherein one end of the second capacitor is coupled to the negative electrode of the power supply and the other end serves as the second output end, and one end of the fourth capacitor is coupled to the positive electrode of the power supply and the other end serves as the fourth output end.

6. The electronic ballast according to claim 5, characterized in that: The first capacitor energy storage unit (213) further comprises a first capacitor having one end coupled to the positive electrode of the power supply and the other end coupled to the second output end; And / or the second capacitor energy storage unit (214) further includes a third capacitor having one end coupled to the positive pole of the power supply and the other end coupled to the fourth output end.

7. The electronic ballast according to any one of claims 1, characterized in that: The voltage transformation and current slowing module (22) further comprises a leading buffer module (23), wherein the leading buffer module (23) comprises a seventh coil in the first transformer, the number of turns of which is much greater than the first coil, the second coil and the third coil, and an eighth coil in the second transformer, the number of turns of which is much greater than the fourth coil, the fifth coil and the sixth coil; The leading buffer module (23) further comprises a first current release unit (231) and a second current release unit (232) for absorbing the induced current generated in the seventh coil and the eighth coil respectively when the signal generating module (1) outputs the first trigger signal, and a connection release unit (233) for connecting the first current release unit (231) and the second current release unit (232) and for releasing the induced current absorbed by the first current release unit (231) and the second current release unit (232).

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