CN111479349B

CN111479349B - An electronic ballast

Info

Publication number: CN111479349B
Application number: CN202010444969.3A
Authority: CN
Inventors: 苏博周; 樊世超
Original assignee: Beijing Charmsstone Jingyuan Electronics Technology Co ltd
Current assignee: Beijing Charmsstone Jingyuan Electronics Technology Co ltd
Priority date: 2020-05-23
Filing date: 2020-05-23
Publication date: 2025-03-18
Anticipated expiration: 2040-05-23
Also published as: CN111479349A

Abstract

The invention relates to an electronic ballast, which belongs to the technical field of ballasts and is used for prolonging the service life of a four-pin light source, and comprises a signal generating module for outputting periodic trigger signals and an oscillation power supply module for outputting power supply signals which are periodically in opposite phases under the action of the trigger signals, wherein four pins of the four-pin light source are connected or output voltage and current are equal under the action of the power supply signals which are periodically in opposite phases, 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 local burden of the four-pin light source is reduced, and the service life of the four-pin light source is prolonged.

Description

Electronic ballast

Technical Field

The invention relates to the technical field of ballasts, in particular to an electronic ballast.

Background

Electronic ballasts refer to electronic devices that electronically drive a light source to produce a desired light.

The existing common light source driven by the electronic ballast is an ultraviolet lamp tube, and the ultraviolet lamp tube comprises a first connector, a second connector, a third connector and a fourth connector, wherein a resistance wire is connected between the first connector and the second connector, and between the third connector and the fourth connector. When the electronic ballast is used for driving the ultraviolet lamp tube to perform disinfection and sterilization, high voltage is required to be generated between two resistance wires in the ultraviolet lamp tube, and air is broken down to perform discharge and luminescence, for example, current flows in from the first connector and the second connector and flows out from the third connector and the fourth connector.

Based on the working principle of the ultraviolet lamp tube, in the process of sterilizing and disinfecting by the light emission of the ultraviolet lamp tube, because the four joints of the ultraviolet lamp tube are basically identical, the two resistance wires are basically identical, so in the process of lighting operation, if the current flowing in the first joint and the second joint are unequal, and the current flowing out of the third joint and the fourth joint are unequal, the working burden of the four joints and the working burden of the part of the resistance wires corresponding to the joints close to the four joints are different, the service lives of the joints with larger burden and the part of the resistance wires are shorter, and the local burden of the ultraviolet lamp tube is damaged in advance in the working process of the ultraviolet lamp tube, so that the service life of the ultraviolet lamp tube is shortened.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide the electronic ballast, and the four-pin light source electronic ballast has equal work loads of all joints and all parts of resistance wires in the process of driving the four-pin light source to emit light, so that the possibility that a certain joint and a certain part of resistance wires of the four-pin light source are damaged in advance and the service life of the four-pin light source is shortened due to relatively large work loads is reduced.

The above object of the present invention is achieved by the following technical solutions:

An electronic ballast for driving a four-pin light source to work, wherein the four-pin light source comprises a first connector, a second connector, a third connector, a fourth connector and two resistance wires, two ends of one resistance wire are respectively coupled with the first connector and the second connector, two ends of the other resistance wire are respectively coupled with the third connector and the fourth connector, and the electronic ballast comprises:

The signal generation module is used for outputting a preheating trigger signal and/or a working trigger signal, wherein the preheating trigger signal comprises a first trigger signal and a second trigger signal, the working trigger signal comprises a third trigger signal and a fourth trigger signal, and the first trigger signal, the second trigger signal, the third trigger signal and the fourth trigger signal are respectively output by a first signal generation end, a second signal generation end, a third signal generation end and a fourth signal generation end;

the oscillation power supply module comprises a first receiving end, a second receiving end, a third receiving end, a fourth receiving end, 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 with the first signal generating end, the second signal generating end, the third signal generating end and the fourth signal generating end, respectively receive the first trigger signal, the second trigger signal, the third trigger signal and the fourth trigger signal, so as to respond to the first trigger signal to output a first voltage supply signal, respond to the second trigger signal to output a second voltage supply signal, respond to the third trigger signal to output a third voltage supply signal and respond to the fourth trigger signal to output a fourth voltage supply signal;

The first voltage supply signal and the second voltage supply signal are respectively represented by the fact that the output signals of the first power supply end and the second power supply end are equal in size and opposite in potential, the output signals of the third power supply end and the fourth power supply end are equal in size and opposite in potential, and the output signals of the first power supply end and the third power supply end are equal in size;

the output signals of the first power supply end and the output signals of the third power supply end are equal in size and opposite in potential, and the output signals of the first power supply end and the output signals of the fourth power supply end are equal in size and opposite in potential;

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

By adopting the technical scheme, the signal generation module outputs the preheating trigger signal and the working trigger signal, the preheating trigger signal comprises the first trigger signal and the second trigger signal, and the working trigger signal comprises the third trigger signal and the fourth trigger signal, so that the oscillation power supply module correspondingly and sequentially outputs the first voltage supply signal, the second voltage supply signal, the third voltage supply signal and the fourth voltage supply signal, the four-pin light source is periodically connected into the first voltage supply signal, the second voltage supply signal, the third voltage supply signal and the fourth voltage supply signal, the first voltage supply signal and the second voltage supply signal are in opposite phase, the third voltage supply signal and the fourth voltage supply signal are in opposite phase, and the sizes of the first connector, the second connector, the third connector and the fourth connector are always equal, so that the four connectors of the four-pin light source have the same working opportunity, namely the working burden of the four connectors and part of resistance wires corresponding to the four connectors in the four-pin light source is the same, the utilization rate of the four-pin light source is improved, the four-pin light source is enabled to emit light more uniformly, the local burden of the four-pin light source is reduced, the possibility of damage of the four-pin light source is prolonged, and the service life of the four-pin light source is prolonged.

Further, the signal generating module includes:

A preheating signal generating unit, configured to output the preheating trigger signal, where the preheating trigger signal includes the first trigger signal whose half period is high level and whose half period is low level, and a second trigger signal that is opposite to the first trigger signal;

The working signal trigger unit is used for outputting the working trigger signal, and the working trigger signal comprises the third trigger signal with a half period of high level and a half period of low level and a fourth trigger signal which is opposite to the third trigger signal;

The state control unit is used for outputting a state trigger signal to trigger the preheating signal generating unit and the working signal generating unit to periodically and alternately work, 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 and the preheating signal generating unit intermittently works, or the preheating signal generating unit starts to intermittently work and the working signal generating unit starts to work.

Further, the preheating signal generating unit comprises a first square wave signal generating unit and a first signal inverting unit, wherein the output end of the first square wave signal generating unit is coupled with the first signal generating end so as to enable the first signal generating end to output the first trigger signal, and the output end of the first square wave signal generating unit is connected with the second receiving end through the first signal inverting unit so as to enable the second signal generating end to output the second trigger signal;

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 with 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 with the fourth signal generating end through the second signal inverting unit so that the fourth signal generating end outputs the fourth trigger signal;

The state control unit comprises a control signal generation unit and a third signal inversion unit, wherein the control signal generation unit is used for outputting working signals with preset time length for triggering the first square wave signal generation unit and the second signal generation unit to work, and the output end of the control signal generation unit is coupled with the triggering end of the first square wave signal generation unit and is connected with the triggering end of the second square wave signal generation unit through the third inverter so as to trigger the second square wave signal generation unit to work after the preset time length.

Further, the signal generating module includes:

the output end of the fundamental wave signal generating unit is used as the first signal generating end and is used for generating the first trigger signal with the high level in the front quarter period and the low level in the rear three quarter period;

the output end of the first phase lag unit is used as the second signal generating end and is coupled with the fundamental wave signal generating unit, and the first trigger signal is received so as to output the second trigger signal with the phase lag of one quarter period of the first trigger signal;

The output end of the second phase lag unit is used as the third signal generating end and is coupled with the first phase lag unit, and the second trigger signal is received so as to output the third trigger signal with the phase lag of one quarter period of the second trigger signal;

And the output end of the third phase lag unit is used as the fourth signal generating end and is coupled with the second phase lag unit to receive the third trigger signal so as to output the fourth trigger signal with the phase lag of one quarter period of the third trigger signal.

Further, the oscillation power supply module includes:

The voltage oscillation module comprises a first receiving end, a second receiving end, a third receiving end, a fourth receiving end, a first output end, a second output end, a third output end and a fourth output end, and is used for responding to a first trigger signal to output a first voltage signal at the first output end, responding to a second trigger signal to output a second voltage signal at the second output end, responding to a third trigger signal to output a third voltage signal at the third output end and responding to a fourth trigger signal to output a fourth voltage signal at the fourth output end;

The voltage transformation and current slowing module comprises a first input end, a second input end, a third input end and a fourth input end which are respectively coupled with the first output end, the second output end, the third output end and the fourth output end so as to respectively receive the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal, and further comprises a first power supply end, a second power supply end, a third power supply end and a fourth power supply end which respectively respond to the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal and slowly flow and output the first power supply signal, the second power supply signal, the third power supply signal and the fourth power supply signal.

The voltage oscillation module comprises a first half-bridge switching unit, a second half-bridge switching unit, a first capacitance energy storage unit and a second capacitance energy storage unit, wherein the first half-bridge switching unit and the second half-bridge switching unit are connected in parallel with a power supply;

the first half-bridge switching unit includes a first switching element and a second switching element connected in series, and the second half-bridge switching unit includes a third switching element and a fourth switching element connected in series;

triggering ends of the first switching element, the second switching element, the third switching element and the fourth switching element are respectively used as a first receiving end, a second receiving end, a third receiving end and a fourth receiving end;

the first output end is used as a node to which the first switching element and the second switching element are coupled, one end of the first capacitive energy storage unit is coupled to the power supply negative electrode, the other end of the first capacitive energy storage unit is used as the second output end, the node to which the third switching element and the fourth switching element are coupled is used as the third output end, and one end of the second capacitive energy storage unit is coupled to the power supply negative electrode, and the other end of the second capacitive energy storage unit is used as the fourth output end.

Further, the first capacitor energy storage unit and the fourth capacitor energy storage unit respectively comprise a second capacitor and a fourth capacitor, one end of the second capacitor is coupled with the negative electrode of the power supply, the other end of the second capacitor is used as the second output end, and one end of the fourth capacitor is coupled with the positive electrode of the power supply, and the other end of the fourth capacitor is used as the fourth output end.

Further, the first capacitor energy storage unit further comprises a first capacitor, one end of which is coupled with the positive electrode of the power supply, and the other end of which is coupled with the second output end;

and/or the second capacitor energy storage unit further comprises a third capacitor with one end coupled with the positive electrode of the power supply and the other end coupled with the fourth output end.

The primary side of the second transformer comprises a fourth coil, the auxiliary side comprises a fifth coil and a sixth coil which have the same number of turns and the same winding direction, the opposite ends of the fifth coil and the sixth coil are coupled with the opposite ends of the fourth coil, and the first coil and the opposite ends of the fourth coil are coupled with each other;

the other end of the first coil is used as the first receiving end, the other end of the fourth coil is used as the second input end, the node coupled with the second coil and the third coil, and the node coupled with the fifth coil and the sixth coil are respectively used as the third input end and the fourth input end;

The different-name ends of the second coil and the third coil, which are far away from each other, are respectively used as the first power supply end and the second power supply end, and the different-name ends of the fifth coil and the sixth coil, which are close to each other, are respectively used as the third power supply end and the fourth power supply end.

Further, the transformation slow flow module further comprises a leading buffer module, wherein the leading buffer module comprises a seventh coil, the coil number of which is far greater than that of the first coil, the second coil and the third coil, and an eighth coil, the coil number of which is far greater than that of the fourth coil, the fifth coil and the sixth coil, in the first transformer;

The dominant buffer module further comprises a first current release unit and a second current release unit which are used for absorbing induced currents generated in the seventh coil and the eighth coil respectively when the signal generation module outputs the first trigger signal, and a connection release unit which is used for connecting the first current release unit and the second current release unit and used for releasing the induced currents absorbed by the first current release unit and the second current release unit.

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

1. the signal generating module triggers the oscillation power supply module to provide time sequence signals which are opposite to each other for the four-pin light source, so that the sizes of circuits which are connected into or discharged from four joints of the four-pin light source are the same, the utilization rate of each joint of the four-pin light source and each part of resistance wire is the same, the possibility of early damage of local burden of the four-pin light source is reduced, and the service life of the four-pin light source is prolonged;

2. The signal generating module is composed of one signal generating unit and three phase lag units, so that the number of signal sources is reduced, and the cost is saved.

Drawings

FIG. 1 is a schematic diagram of a circuit structure according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of a signal generating module according to a second embodiment of the invention.

In the figure, 1, a signal generation module; 11, a fundamental wave signal generating unit; 12, a first phase lag unit, 13, a second phase lag unit, 14, a third phase lag unit, 14, a preheating signal generating unit, 141, a first square wave signal generating unit, 142, a first signal inverting unit, 15, a working signal generating unit, 151, a second square wave signal generating unit, 152, a second signal inverting unit, 16, a state control unit, 161, a control signal generating unit, 162, a third signal inverting unit, 2, an oscillation power supply module, 21, a voltage oscillation module, 211, a first half-bridge switch unit, 212, a second half-bridge switch unit, 213, a first capacitance energy storage unit, 214, a second capacitance energy storage unit, 22, a variable voltage slow current module, 23, a leading buffer module, 231, a first current releasing unit, 232, a second current releasing unit, 233 and a connection releasing unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Embodiment one:

Referring to fig. 1, an electronic ballast for driving a four-pin ultraviolet LAMP to operate includes a signal generating module 1 for outputting periodic trigger signals and an oscillating power supply module 2 for outputting power supply signals periodically in opposite phases with each other under the action of the trigger signals, the LAMP tube LAMP periodically supplies power signals in opposite phases to make the four joints of the LAMP tube LAMP equal in access or outflow, so that the work loads of the joints and the resistance wires of the parts of the LAMP tube LAMP are equal, the LAMP tube LAMP utilization rate is improved, the possibility of early damage of the LAMP tube LAMP local load is reduced, and the service life of the LAMP tube LAMP is prolonged.

The signal generating module 1 includes a fundamental wave signal generating unit 11 for generating a few wave signal of which the front quarter period is high level and the rear three quarter period is low level, and a first phase lag unit 12, a second phase lag unit 13, and a third phase lag unit for phase-laging the signal output by the fundamental wave signal generating unit 11. The trigger end of the fundamental wave signal generating unit 11 is coupled to a power supply and switching circuit of the electronic ballast and the fundamental wave signal generating unit 11 starts to operate when the electronic ballast is started, and the coupling manner is a conventional technical means for those skilled in the art, and will not be further described herein. Specifically, the fundamental wave signal generating unit 11 is coupled to the positive electrode of the power supply through a key switch, and the on-off of the fundamental wave signal generating unit can be controlled through the key switch.

In a specific embodiment, the fundamental wave signal generating unit 11 is configured as a square wave signal generator, and the mode of outputting the periodic signal with the front quarter period being high level and the rear three quarters period being low level by adopting the square wave signal generator is a conventional technical means for those skilled in the art, and the period size of the fundamental wave signal can be set according to practical application needs, which is not described herein. The output terminal of the fundamental wave signal generating unit 11 is coupled to the first signal generating terminal so that the first signal generating terminal outputs the fundamental wave signal, i.e., the first trigger signal.

The first phase lag unit 12, the second phase lag unit 13 and the third phase lag unit may be all configured as delay circuits composed of 555 timers and external delay circuits thereof, the circuit for realizing the delay function by the 555 timers is a conventional circuit topology structure, and the conventional application of the 555 delay circuit with the designated time of setting the 555 delay time to be a quarter period is a 555 delay circuit, which will not be described in detail.

The first phase lag unit 12 is coupled to the fundamental wave signal generating unit 11 to receive the first trigger signal, the output end is coupled to the second signal generating end to enable the second signal generating end to output a second trigger signal with a phase lag of one quarter period of the first trigger signal, the second phase lag unit 13 is coupled to the first phase lag unit 12 to receive the second trigger signal, the output end is coupled to the third signal generating end to enable the third signal generating end to output a third trigger signal with a phase lag of one quarter period of the second trigger signal, the third phase lag unit 14 is coupled to the second phase lag unit 13 to receive the third trigger signal, and the output end is coupled to the third signal generating end to enable the third signal generating end to output a fourth trigger signal with a phase lag of one quarter period of the third trigger signal. The method can realize that the phase of the second trigger signal lags by one quarter period in the first trigger signal, the phase of the third trigger signal lags by one quarter period in the second trigger signal, the phase of the fourth trigger signal lags by one quarter period in the third trigger signal, and output of four periodic signals with sequentially lags phases is realized through a single signal source, so that the number of signal sources is reduced, the structure is simple, and the setting is convenient.

Of course, the first phase lag unit 12, the second phase lag unit 13 and the third phase lag unit may be configured as other delay circuits or configured by a program, which are not described in detail herein.

The oscillation power supply module 2 comprises a voltage oscillation module 21 for outputting voltage signals which are periodically in opposite phases, and a voltage transformation slow current module 22 for slowly outputting the voltage signals.

The voltage oscillating module 21 includes a first half-bridge switch unit 211, a second half-bridge switch unit 212, a first capacitive energy storage unit 213, and a second capacitive energy storage unit 214.

The first half-bridge switching unit 211 includes a first switching element and a second switching element connected in series, and the second half-bridge switching unit 212 includes a third switching element and a fourth switching element connected in series. In this embodiment, the first switching element, the second switching element, the third switching element, and the fourth switching element are respectively configured as an N-channel depletion type MOS transistor Q1, an MOS transistor Q2, an MOS transistor Q3, and an MOS transistor Q4, where a source of the MOS transistor Q1 is coupled to a positive electrode of the power supply, a drain of the MOS transistor Q1 is coupled to a source of the MOS transistor Q2, and a drain of the MOS transistor Q2 is coupled to a negative electrode of the power supply; the source electrode of the MOS transistor Q3 is coupled with the source electrode of the MOS transistor Q1, the drain electrode of the MOS transistor Q4 is coupled with the drain electrode 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, the second capacitor energy storage unit 214 includes a third capacitor C3 and a fourth capacitor C4 connected in series, one end of the first capacitor C1 away from the second capacitor C2, one end of the third capacitor C3 away from the fourth capacitor C4 are all coupled to the source of the MOS transistor Q1, one end of the second capacitor C2 away from the first capacitor C1, and one end of the fourth capacitor C4 away from the third capacitor C3 are all coupled to the drain of the MOS transistor Q2.

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, so as to respectively receive the first trigger signal, the second trigger signal, the third trigger signal, and the fourth trigger signal, that is, the first receiving end, the second receiving end, the third receiving end, and the fourth receiving end of the voltage oscillating module 21. The drain electrode of the MOS transistor Q1, the node coupled to the first capacitor C1 and the second capacitor C2, the drain electrode of the MOS transistor Q3, and the node coupled to the third capacitor C3 and the fourth capacitor C4 output a first voltage signal, a second voltage signal, a third voltage signal, and a fourth voltage signal, respectively, that is, the first output end, the second output end, the third output end, and the fourth output end of the voltage oscillating module 21 respectively.

The transformation slow-flow module 22 comprises a first transformer T1 and a second transformer T2, the first transformer T1 comprises a primary side first coil L1 and two sections of secondary side second coils L2 and third coils L3 with equal turns, and the second transformer T2 comprises a primary side fourth coil L4 and two sections of secondary side fifth coils L5 and sixth coils L6 with equal turns. In this embodiment, 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 respectively have the same number of turns and the same winding direction, and the second coil L2, the third coil L3, and the first coil L1 have the same winding direction and the same length as 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 from each other, and the first coil L1 and the fourth coil L4 are equal in length and are coupled at opposite ends.

The end of the first coil L1 far away from the fourth coil L4, the end of the fourth coil L4 far 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 first output end, the second output end, the third output end, and the fourth output end, so as to respectively receive the first voltage signal, the second voltage signal, the third voltage signal, and the fourth voltage signal, that is, the first input end, the second input end, the third input end, and the fourth input end of the voltage transformation buffer module 22.

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

The ultraviolet LAMP tube LAMP comprises a first connector, a second connector, a third connector and a fourth connector which are sequentially arranged, a first resistance wire is arranged between the first connector and the second connector, a second resistance wire 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 with the first power supply end, the second power supply end, the third power supply end and the fourth power supply end so as to receive the first voltage supply signal, the second voltage supply signal, the third voltage supply signal or the fourth voltage supply signal.

It should be noted that, in order to avoid the situation that current loss is different in the transmission process of current transmitted on wires with different lengths, the power supply is set as a constant current source, and compared with the constant voltage source, the constant current source avoids the current change caused by the length change of the wires.

The implementation principle of the embodiment is that after the electronic ballast is started,

The signal generating module 1 outputs a first trigger signal, a second trigger signal, a third trigger signal and a fourth trigger signal which are delayed by a quarter period in sequence, so that the MOS tube Q1, the MOS tube Q2, the MOS tube Q3 and the MOS tube Q4 are respectively conducted in a first quarter period, a second quarter period, a third quarter period and a fourth quarter period in sequence.

In the first quarter period, the MOS transistor Q1 is turned on, the current sequentially flows from the positive electrode of the power supply through the MOS transistor Q1, the first coil L1, and the fourth coil L4 to charge the end of the second capacitor C2 far away from the negative electrode of the power supply, the other end of the second capacitor C2 discharges to the negative electrode of the power supply, the second coil L2 generates the current from the end far from the third coil L3 to the end coupled to the third coil L3, the third coil L3 generates the current from the end coupled to the end far from the second coil L2, the fifth coil L5 generates the current from the end coupled to the end near to the sixth coil L6, and the sixth coil L6 generates the current from the end near to the fifth coil L5 to the end coupled to the fifth coil L5, i.e., the first connector, the second connector, the third connector, and the fourth connector of the ultraviolet LAMP respectively output, switch in and output the current voltage.

In the second quarter period, the MOS transistor Q2 is turned on, the second capacitor C2 discharges, the current sequentially flows from the end of the second capacitor C2 far from the power supply negative electrode to the fourth inductor L4, the first inductor L1, and the MOS transistor Q2, while the other end of the second capacitor C2 discharges to the power supply negative electrode, the second coil L2 generates the current from the end of the coupling third coil L3 to the end far from the third coil L3, the third coil L3 generates the current from the end far from the second coil L2 to the end of the coupling second coil L2, the fifth coil L5 generates the current from the end near to the sixth coil L6 to the end of the coupling sixth coil L6, and the sixth coil L6 generates the current from the end of the coupling fifth coil L5 to the end near to the fifth coil L5, i.e., the first joint, the second joint, the third joint, and the fourth joint of the ultraviolet LAMP respectively switch in, output and switch in the current.

In the first quarter cycle and the second quarter cycle, since the lengths of the first coil L1 and the fourth coil L4 are identical, that is, the inductances and the resistances of the first coil L1 and the fourth coil L4 are identical, and the lengths of the second coil L2, the third coil L3, the fifth coil L5 and the sixth coil L6 are identical, the magnitudes of the currents which the first connector, the second connector, the third connector and the fourth connector of the ultraviolet LAMP tube LAMP are connected or flow in are identical, the current passing through the two resistance wires of the ultraviolet LAMP tube LAMP is equal in size, namely the same-size overcurrent heating is carried out on the two resistance wires of the ultraviolet LAMP tube LAMP, so that the possibility of inconsistent work load of the two resistance wires of the ultraviolet LAMP tube LAMP is further reduced, the possibility of larger work load and early damage of one resistance wire of the ultraviolet LAMP tube LAMP is further reduced, and the service life of the ultraviolet LAMP tube LAMP is further prolonged. In the process, 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 can give current an effect of slow current, so that the possibility that the LAMP tube LAMP is damaged due to too fast current change in the LAMP tube LAMP is reduced. In addition, when the power is electrified for the first time, the positive electrode of the power supply needs to charge the first capacitor C1, and the slow current effect of the coil is added, so that the ultraviolet LAMP tube LAMP can be preheated under the action of current which is more slowly increased, the effect of a starter is achieved, and the possibility of damage of the ultraviolet LAMP tube LAMP is further reduced.

In the third quarter period, the MOS tube Q3 is conducted, current flows from the positive electrode of the power supply to the equal-size shunt from the MOS tube Q3 to the node where the second coil L2 and the third coil L3 are coupled, the different-name ends of the second coil L2 and the third coil L3 far away from each other flow into the first joint and the second joint of the ultraviolet LAMP tube LAMP respectively, then the equal-size shunt from the third joint and the fourth joint of the ultraviolet LAMP tube LAMP flows out to the different-name ends of the fifth coil L5 and the sixth coil L6 near each other, and the current flows to the end, far away from the power supply cathode, of the fourth capacitor C4 in a converging manner at the node where the fifth coil L5 and the sixth coil L6 are coupled, so that the end, far away from the power supply cathode, of the fourth capacitor C4 is charged, and meanwhile, the other end of the fourth capacitor C4 discharges to the power supply cathode.

In the fourth quarter period, the MOS tube Q4 is conducted, the fourth capacitor C4 discharges, the current flows from the end of the fourth capacitor C4 far away from the negative electrode of the power supply to the equal-size shunt of the node coupled with the fifth coil L5 and the sixth coil L6, and flows to the third joint and the fourth joint of the ultraviolet LAMP tube LAMP respectively at the different-name ends of the fifth coil L5 and the sixth coil L6 which are close to each other, then flows out to the different-name ends of the second coil L2 and the third coil L3 which are far away from each other respectively from the first joint and the second joint, and flows through the MOS tube Q4 to the negative electrode of the power supply at the node coupled with the second coil L2 and the third coil L3.

In the third quarter cycle and the fourth quarter cycle, as the lengths of the first coil L1 and the fourth coil L4 are identical, namely the inductances and the resistances of the first coil L1 and the fourth coil L4 are identical, and the lengths of the second coil L2, the third coil L3, the fifth coil L5 and the sixth coil L6 are identical, the magnitudes of the currents which are connected or flowed into the ultraviolet LAMP tube LAMP are identical, namely the efficiency of the ultraviolet LAMP tube LAMP for transmitting electrons is identical, so that the workload of the ultraviolet LAMP tube LAMP is uniformly distributed, the possibility of partial early damage caused by the overlarge local workload of the ultraviolet LAMP tube LAMP is avoided, and the service life of the ultraviolet LAMP tube LAMP is prolonged. In addition, when the primary power is on, the positive electrode of the power supply needs to charge the first capacitor C1 and the third capacitor C3, and the slow current effect of the coil is added, so that the ultraviolet LAMP tube LAMP can be preheated under the action of current which is more slowly increased, the effect of a starter is achieved, and the possibility of damage of the ultraviolet LAMP tube LAMP is further reduced.

Further, the voltage transformation and current buffer module 22 further includes a dominant buffer module 23, and the dominant buffer module 23 plays a main role in current direction transformation of the first transformer T1 and the second transformer T2, so as to avoid too fast current change of 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 in the first transformer T1.

Specifically, the dominant buffer module 23 includes a seventh coil L7 of the first transformer T1, the second coil L2, and the third coil L3, and an eighth coil L8 of the second transformer T2, the number of turns of which is far greater than that of the fourth coil L4, the fifth coil L5, and the sixth coil L6, where the winding directions of the seventh coil L7 and the eighth coil L8 are the same as those of the second coil L2 and the fifth coil L5, and the number of turns of the seventh coil L7 and the eighth coil L8 are relatively large, so that the dominant buffer function can be achieved for the magnetic field direction transformation of the first transformer T1 and the second transformer T2, respectively. The number of turns of the seventh coil L7 and the eighth coil L8 are equal, so that the buffer effect of the seventh coil L7 and the eighth coil L8 on the current is consistent, the corresponding consistency of the currents or induction currents in other coils of the first transformer T1 and the second transformer T2 is kept, and the equality of the voltages and currents accessed by the four joints of the ultraviolet LAMP tube LAMP is further kept.

The dominant snubber module 23 further includes a first current discharge unit 231 for discharging the current induced in the seventh coil L7 and a second current discharge unit 232 for discharging the current induced in the eighth coil L8 in the first quarter period.

The first current discharging 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.

The second current discharge 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 power negative electrode through the third fixed resistor R3, and the other end of the eighth coil L8 is also coupled to the power negative electrode.

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 in the first quarter period respectively, that is, play a dominant role in buffering the current change of the first quarter period, mainly avoid the current change of the first transformer T1 and the second transformer T2 in the process from the non-working state, that is, no current to the current generation, and avoid the damage of the resistance wire caused by the excessively fast speed of the current generation from no current to the current generation of the resistance wire in the LAMP tube LAMP.

Preferably, the main buffer module 23 further includes a connection release unit 233 connecting 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.

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 period, induced currents are generated in the seventh coil L7 and the eighth coil L8, the induced currents generated in the seventh coil L7 are charged to the ends of the fifth capacitor C5 and the sixth capacitor C6, which are far away from the power supply negative electrode, the induced currents generated in the eighth coil L8 are charged to the ends of the sixth capacitor C6, which are close to the power supply negative electrode, and since the induced currents generated in the seventh coil L7 and the eighth coil L8 are the same, the charge amounts of the seventh coil L7 to the fifth capacitor C5 and the sixth capacitor C6 can be offset from the charge amounts of the eighth coil L8 to the sixth capacitor C6, so that the discharge of the fifth capacitor C5 and the sixth capacitor C6 is realized, and the fifth capacitor C5 and the sixth capacitor C6 can be continuously put into the suppression of the current transformation of the first transformer T1 and the second transformer T2 after the discharge is completed.

In the above working process, the dominant buffer module 23 can play a role of a starter, and can play a dominant role on magnetic fields of the first transformer T1 and the second transformer T2, so that damage to the resistance wire caused by too fast current increase of the resistance wire in the ultraviolet LAMP tube LAMP is avoided, and the mutual influence of the magnetic fields of the first coil L1, the second coil L2 and the third coil L3, and the mutual influence of the magnetic fields of the fourth coil L4, the fifth coil L5 and the sixth coil L6 can also be avoided.

Embodiment two:

referring to fig. 1 and 2, this embodiment differs from the first embodiment in that:

The signal generating module 1 includes a warm-up signal generating unit 14 for outputting a warm-up trigger signal, an operation signal generating unit 15 for outputting an operation trigger signal, and a state control unit 16 for controlling the operation states of the warm-up signal generating unit 14 and the operation signal generating unit 15.

The preheating signal generating unit 14 and the operating signal generating unit 15 include two completely identical square wave signal generators whose output first half period is high level and whose output second half period is low level. The preheating signal generating unit 14 and the operating signal generating unit 15 further 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 with the first receiving end of the voltage oscillating module 21 and is connected with the second receiving end of the voltage oscillating module 21 through the first inverter A1, the output end of the square wave signal generator in the working signal generating unit 15 is connected with the third receiving end of the voltage oscillating module 21 and is connected with the fourth receiving end of the voltage oscillating module 21 through the second inverter A2, so that the MOS tube Q1 and the MOS tube Q2, the MOS tube Q3 and the MOS tube Q4 in the voltage oscillating module 21 are connected with trigger signals with opposite phases, namely, the MOS tube Q1 and the MOS tube Q2 are alternately conducted when the preheating signal generating unit 14 works, and the MOS tube Q3 and the MOS tube Q4 are alternately conducted when the working signal generating unit 15 works. Based on the principle introduction in the first embodiment, when the preheating signal generating unit 14 works, alternating current with the frequency consistent with the trigger signal period flows through the two resistance wires of the ultraviolet LAMP tube LAMP, so that the preheating of the ultraviolet LAMP tube LAMP is realized, when the working signal generating unit 15 works, pressure difference is generated between the two resistance wires of the ultraviolet LAMP tube LAMP, air discharge is broken down, and therefore the light emission of the ultraviolet LAMP tube LAMP is realized, 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 in the preheating and light emission processes is the same, so that the possibility of excessively advanced damage to the local burden of the ultraviolet LAMP tube and the reduction of the working life of the ultraviolet LAMP tube LAMP is avoided.

The state control unit 16 may be configured as a signal controller of any form of state control signal, which is connected to the trigger ends of square wave signal generators in the preheating signal generating unit 14 and the operating signal generating unit 15 through two output ends, so as to trigger the preheating signal generating unit 14 and the operating signal generating unit 15 to operate in any form, that is, trigger the ultraviolet LAMP to perform preheating or lighting operation, the preheating and the light emission of the LAMP tube LAMP may be any form, such as preheating for a preset period, then alternately preheating (heating and heating the resistance wire) and emitting light, or preheating (heating and heating the resistance wire) intermittently in the light emitting process for maintaining the temperature of the resistance wire of the LAMP tube LAMP, or starting to operate and intermittently preheating at the same time, which are not described in detail herein, and only the following examples are provided.

In an example, the state control unit 16 stops and starts to trigger the operation signal sound generating unit 15 to start operation after the preheating signal generating unit 14 is triggered to operate for a preset period of time.

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

The triggering end of the timer 161 is coupled to the power switch circuit of the electronic ballast, and the timer 161 starts to operate when the electronic ballast is started, and the coupling manner is a conventional technical means for those skilled in the art, which is not further described herein. Specifically, the triggering end of the timer 161 is connected to the positive electrode of the power supply through a key switch, so as to control the on-off of the timer 161 through the key switch.

The output end of the timer 161 is coupled to the trigger end of the square wave signal generator in the preheating signal generating unit 14 and is coupled to the trigger end 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 two square wave signal generators start to work when the trigger ends of the two square wave signal generators are connected with the high level.

The timer 161 outputs a high-level signal with preset duration first to trigger the preheating signal generating unit 14 to work for preset duration, namely the ultraviolet LAMP tube LAMP performs preheating work with preset duration, 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 tube LAMP enters a working state, so that state control of the ultraviolet LAMP tube LAMP which is preheated for preset duration first and then works is realized.

Of course, the process of outputting the square wave signal and controlling the state of the signal generating module 1 may be set as a program or other functional circuits based on the principle, and can be implemented by conventional technical means of those skilled in the art, which are not described herein.

The embodiments of the present invention are all preferred embodiments of the present invention, and are not limited in scope by the present invention, so that all equivalent changes according to the structure, shape and principle of the present invention are covered by the scope of the present invention.

Claims

1. An electronic ballast is used for driving a four-pin light source to work, and the four-pin light source comprises a first joint, a second joint, a third joint and a fourth joint, and is characterized in that the electronic ballast comprises:

The signal generation module (1) is used for outputting a preheating trigger signal and a working trigger signal, wherein the preheating trigger signal comprises a first trigger signal and a second trigger signal, the working trigger signal comprises a third trigger signal and a fourth trigger signal, and the first trigger signal, the second trigger signal, the third trigger signal and the fourth trigger signal are respectively output by a first signal generation end, a second signal generation end, a third signal generation end and a fourth signal generation end;

The oscillation power supply module (2) comprises a first receiving end, a second receiving end, a third receiving end, a fourth receiving end, 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 with 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 output signals of the first power supply end and the output signals of the third power supply end are equal in size and opposite in direction, and the output signals of the first power supply end and the output signals of the fourth power supply end are equal in size 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 with the first power supply end, the second power supply end, the third power supply end and the fourth power supply end so as to receive the first voltage supply signal, the second voltage supply signal, the third voltage supply signal or the fourth voltage supply signal;

The voltage oscillation module (21) comprises a first receiving end, a second receiving end, a third receiving end, a fourth receiving end, a first output end, a second output end, a third output end and a fourth output end, wherein the voltage oscillation module (21) responds to a first trigger signal to output a first voltage signal at the first output end, responds to a second trigger signal to output a second voltage signal at the second output end, responds to a third trigger signal to output a third voltage signal at the third output end and responds to a fourth trigger signal to output a fourth voltage signal at the fourth output end;

The voltage transformation and current delay module (22) comprises a first input end, a second input end, a third input end and a fourth input end which are respectively coupled with the first output end, the second output end, the third output end and the fourth output end so as to respectively receive the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal, and further comprises a first power supply end, a second power supply end, a third power supply end and a fourth power supply end which are respectively used for responding to the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal and outputting the first voltage supply signal, the second voltage supply signal, the third voltage supply signal and the fourth voltage supply signal in a current delay way;

The voltage transformation current-retarding module (22) comprises a first transformer and a second transformer, wherein the primary side of the first transformer comprises a first coil, the auxiliary side comprises a second coil and a third coil which have the same number of turns and the same winding direction, and the third coil of the second coil is coupled with the opposite-name end which is close to each other;

the other end of the first coil is used as the first input end, the other end of the fourth coil is used as the second input end, the node coupled with the second coil and the third coil, and the node coupled with the fifth coil and the sixth coil are respectively used as the third input end and the fourth input end;

the different-name ends of the second coil and the third coil, which are far away from each other, are respectively used as the first power supply end and the second power supply end, and the different-name ends of the fifth coil and the sixth coil, which are close to each other, are respectively used as the third power supply end and the fourth power supply end;

the signal generation module (1) comprises:

A preheat signal generation unit (14) for outputting the preheat trigger signal, the preheat trigger signal including the first trigger signal having a half-period of high level and a half-period of low level, and a second trigger signal inverted from the first trigger signal;

The state control unit (16) is used for outputting a state trigger signal to trigger the preheating signal generation unit (14) and the working signal generation unit (15) to work alternately periodically, or the working signal generation unit (15) starts to work after the preheating signal generation unit (14) works for a preset time, and the preheating signal generation unit (14) intermittently works, or the preheating signal generation unit (14) starts to work intermittently and the working signal generation unit (15) starts to work simultaneously.

2. An electronic ballast according to claim 1, wherein said preheating signal generating unit (14) comprises a first square wave signal generating unit (141) and a first signal inverting unit (142), said first square wave signal generating unit (141) having an output coupled to said first signal generating terminal for said first signal generating terminal to output said first trigger signal, said first square wave signal generating unit (41) having an output coupled to said second signal generating terminal through said first signal inverting unit (142) for said second signal generating terminal to output said 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 the output end of the second square wave signal generating unit (151) is coupled with the third signal generating end so as to enable the third signal generating end to output the third trigger signal, and the second square wave signal generating unit (151) is connected with the fourth signal generating end through the second signal inverting unit (152) so as to enable the fourth signal generating end to output the fourth trigger signal;

The state control unit (16) comprises a control signal generation unit (161) and a third signal inversion unit (162), the control signal generation unit (161) is used for outputting a working signal with a preset duration for triggering the first square wave signal generation unit (141) to work, and the output end of the control signal generation unit (161) is coupled with the triggering end of the first square wave signal generation unit (141) and is connected with the triggering end of the second square wave signal generation unit (151) through the third signal inversion unit (162) so as to trigger the second square wave signal generation unit (152) to work after the preset duration.

3. An electronic ballast according to claim 1, wherein said signal generating module (1) comprises:

A fundamental wave signal generating unit (11), the output end of which is used as the first signal generating end for generating the first trigger signal with the front quarter period being high level and the rear three quarter period being low level;

A first phase lag unit (12) with an output end serving as the second signal generation end, coupled to the fundamental wave signal generation unit (11), for receiving the first trigger signal and outputting the second trigger signal with a phase lag of one quarter period of the first trigger signal;

A second phase lag unit (13), the output end of which is used as the third signal generating end and is coupled with the first phase lag unit (12), and the second trigger signal is received so as to output the third trigger signal with the phase lag of one quarter period of the second trigger signal;

And the output end of the third phase lag unit (14) is used as the fourth signal generating end and is coupled with the second phase lag unit (13) to receive the third trigger signal so as to output the fourth trigger signal with the phase lag of one quarter period of the third trigger signal.

4. The electronic ballast according to claim 1, wherein the voltage oscillating module (21) comprises a first half-bridge switching unit (211), a second half-bridge switching unit (212), a first capacitive energy storage unit (213) and a second capacitive energy storage unit (214), wherein the first half-bridge switching unit (211) and the second half-bridge switching unit (212) are connected in parallel to a power supply;

The first half-bridge switching unit (211) comprises a first switching element and a second switching element connected in series, and the second half-bridge switching unit (212) comprises a third switching element and a fourth switching element connected in series;

The first output end is used as a node to which the first switching element and the second switching element are coupled, one end of the first capacitive energy storage unit (213) is coupled to a power supply negative electrode, the other end of the first capacitive energy storage unit is used as the second output end, the node to which the third switching element and the fourth switching element are coupled is used as the third output end, and one end of the second capacitive energy storage unit (214) is coupled to the power supply negative electrode, and the other end of the second capacitive energy storage unit is used as the fourth output end.

5. An electronic ballast according to claim 4, wherein said first capacitor energy storage unit (213) and said second capacitor energy storage unit (214) comprise a second capacitor and a fourth capacitor, respectively, said second capacitor having one end coupled to a negative power supply and the other end as said second output terminal, and said fourth capacitor having one end coupled to a positive power supply and the other end as said fourth output terminal.

6. An electronic ballast as set forth in claim 5, wherein,

The first capacitor energy storage unit (213) further comprises a first capacitor with 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 capacitive energy storage unit (214) further comprises a third capacitor with one end coupled to the positive electrode of the power supply and the other end coupled to the fourth output end.

7. The electronic ballast of any of claim 1, wherein said voltage-transforming and current-buffering module (22) further comprises a dominant buffering module (23), said dominant buffering module (23) comprising a seventh coil having a substantially greater number of turns in said first transformer than in said first, second, third and eighth coils having a substantially greater number of turns in said second transformer than in said fourth, fifth and sixth coils;

The dominant buffer module (23) further comprises a first current release unit (231) and a second current release unit (232) for respectively absorbing the induced current generated in the seventh coil and the eighth coil when the signal generation 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).