CN209748876U - Electronic ballast with inversion protection - Google Patents
Electronic ballast with inversion protection Download PDFInfo
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- CN209748876U CN209748876U CN201822278741.2U CN201822278741U CN209748876U CN 209748876 U CN209748876 U CN 209748876U CN 201822278741 U CN201822278741 U CN 201822278741U CN 209748876 U CN209748876 U CN 209748876U
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Abstract
The utility model discloses an electronic ballast with inversion protection, including electromagnetic compatibility circuit, full-bridge soft start rectifier circuit, power factor correction circuit, boost circuit, inverter circuit and fluorescent tube, the input of full-bridge soft start rectifier circuit with the output of electromagnetic compatibility circuit is connected, the input of power factor correction circuit with the output of full-bridge soft start rectifier circuit is connected, the input of boost circuit with the output of power factor correction circuit is connected, the input of inverter circuit with the output of boost circuit is connected, the fluorescent tube with the output of inverter circuit is connected; the inverter circuit comprises a voltage input end, a first IGBT (insulated gate bipolar transistor), a first MOS (metal oxide semiconductor) tube, a first capacitor, a second IGBT tube, a second MOS tube, a first inductor, a second inductor and a voltage output end. The utility model discloses circuit structure is comparatively simple, the cost is lower, the security and the reliability of convenient maintenance, circuit are higher.
Description
Technical Field
The utility model relates to an electronic ballast field, in particular to electronic ballast with contravariant protection.
Background
An electronic ballast is a kind of ballast, which refers to an electronic device that uses electronic technology to drive an electric light source to generate the required illumination. Corresponding to this is an inductive ballast (or ballast). Modern fluorescent lamps are increasingly provided with electronic ballasts, which are light and small, and even can integrate the electronic ballasts with lamp tubes and the like, and meanwhile, the electronic ballasts can have the function of a starter, so that the independent starter can be omitted. The electronic ballast can also have more functions, such as improving or eliminating the flickering phenomenon of the fluorescent lamp by increasing the current frequency or the current waveform (such as changing the current waveform into a square wave); the fluorescent lamp can use a direct current power supply through a power supply inversion process. Some of the disadvantages of conventional inductive rectifiers are making them being replaced by increasingly sophisticated electronic ballasts. However, the circuit part of the traditional electronic ballast uses more components, the circuit structure is complex, the hardware cost is high, and the maintenance is inconvenient. In addition, since the circuit part of the conventional electronic ballast lacks the corresponding circuit protection function, for example: the lack of a function of preventing signal interference results in poor safety and reliability of the circuit.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit structure comparatively simple, the cost is lower, convenient maintenance, the security and the higher electronic ballast that has the contravariant protection of reliability of circuit.
The utility model provides a technical scheme that its technical problem adopted is: an electronic ballast with inversion protection is constructed, and comprises an electromagnetic compatibility circuit, a full-bridge soft start rectifying circuit, a power factor correcting circuit, a booster circuit, an inverter circuit and a lamp tube, wherein the input end of the full-bridge soft start rectifying circuit is connected with the output end of the electromagnetic compatibility circuit, the input end of the power factor correcting circuit is connected with the output end of the full-bridge soft start rectifying circuit, the input end of the booster circuit is connected with the output end of the power factor correcting circuit, the input end of the inverter circuit is connected with the output end of the booster circuit, and the lamp tube is connected with the output end of the inverter circuit;
The inverter circuit comprises a voltage input end, a first IGBT (insulated gate bipolar transistor), a first MOS (metal oxide semiconductor) tube, a first capacitor, a second IGBT tube, a second MOS tube, a first inductor, a second inductor and a voltage output end, wherein one end of the voltage input end is respectively connected with a collector electrode of the first IGBT tube and one end of the first capacitor, an emitter electrode of the first IGBT tube is respectively connected with one end of the first inductor and a drain electrode of the first MOS tube, the other end of the first capacitor is connected with a collector electrode of the second IGBT tube, an emitter electrode of the second IGBT tube is respectively connected with a drain electrode of the second MOS tube and one end of the second inductor, the other end of the voltage input end is respectively connected with a source electrode of the first MOS tube and a source electrode of the second MOS tube, the other end of the first inductor is connected with one end of the voltage output end, and the other end of the second inductor is connected with the other end of the voltage output end, the capacitance value of the first capacitor is 150 pF.
In the electronic ballast with inverter protection, the inverter circuit further includes a first diode, the anode of the first diode is connected to the one end of the voltage input terminal, the cathode of the first diode is connected to the collector of the first IGBT tube and the one end of the first capacitor, and the model of the first diode is S-452T.
In the electronic ballast with inverter protection, the inverter circuit further includes a second capacitor, one end of the second capacitor is connected to the emitter of the first IGBT tube, the other end of the second capacitor is connected to the drain of the first MOS tube, and the capacitance of the second capacitor is 260 pF.
In the electronic ballast with inverter protection, the inverter circuit further includes a third capacitor, one end of the third capacitor is connected to the emitter of the second IGBT tube, the other end of the third capacitor is connected to the drain of the second MOS tube, and the capacitance of the third capacitor is 260 pF.
In the electronic ballast with inverter protection of the present invention, the first MOS transistor and the second MOS transistor are N-channel MOS transistors.
Implement the utility model discloses an electronic ballast with contravariant protection has following beneficial effect: owing to be equipped with the electromagnetic compatibility circuit, full-bridge soft start rectifier circuit, power factor correction circuit, boost circuit, inverter circuit and fluorescent tube, inverter circuit includes voltage input end, first IGBT pipe, first MOS pipe, first electric capacity, second IGBT pipe, the second MOS pipe, first inductance, second inductance and voltage output end, this inverter circuit compares with traditional electronic ballast's circuit part, its components and parts that use are less, owing to saved some components and parts, can reduce the hardware cost like this, in addition, first electric capacity is used for preventing the interference between first IGBT pipe and the second IGBT pipe, therefore circuit structure is comparatively simple, the cost is lower, convenient maintenance, the security and the reliability of circuit are higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an electronic ballast with inverter protection according to the present invention;
Fig. 2 is a schematic circuit diagram of the inverter circuit in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
in the embodiment of the electronic ballast with inverter protection of the present invention, a schematic structural diagram of the electronic ballast with inverter protection is shown in fig. 1. In fig. 1, this electronic ballast with inversion protection includes electromagnetic compatibility circuit 1, full-bridge soft start rectifier circuit 2, power factor correction circuit 3, boost circuit 4, inverter circuit 5 and fluorescent tube 6, wherein, full-bridge soft start rectifier circuit 2's input is connected with electromagnetic compatibility circuit 1's output, power factor correction circuit 3's input is connected with full-bridge soft start rectifier circuit 2's output, boost circuit 4's input is connected with power factor correction circuit 3's output, inverter circuit 5's input is connected with boost circuit 4's output, fluorescent tube 6 is connected with inverter circuit 5's output.
An external two-phase 380V alternating voltage signal is input into the electromagnetic compatibility circuit 1, 2 live wires are input into the electromagnetic compatibility circuit 1, the rated voltage is alternating current 380V, and the input voltage range is 340-440V; the electromagnetic compatibility circuit 1 is used for eliminating higher harmonic signals in an external power grid, so that the electronic ballast with the inversion protection is prevented from being influenced by various higher harmonic signals of the external power grid, and meanwhile, the influence of interference signals generated by the electronic ballast with the inversion protection on the normal operation of the external power grid can be effectively avoided.
The full-bridge soft-start rectifying circuit 2 rectifies the two-phase 380V alternating current signal output by the electromagnetic compatible circuit 1 into a direct current signal, that is, rectifies the 2-phase 380V alternating current signal into a direct current signal directly. The power factor correction circuit 3 and the booster circuit 4 correct the power factor of the input electric signal and output a stable dc electric signal. The power factor correction circuit 3 and the booster circuit 4 adopt a 3-frequency multiplication technology, so that the working frequency of the power factor correction circuit can be improved, and the ripples of the direct current bus voltage and current are effectively reduced.
Because the power factor correction circuit 3 adopts a preceding stage BOOST circuit, the voltage of the rectified direct current bus is improved, and the requirement of output current on a power device can be effectively reduced under the condition of the same output power; therefore, the scheme that an IGBT is replaced by a high-voltage low-current MOS tube power device can be selected, the cost can be effectively reduced, and the efficiency of the electronic ballast with the inverter protection can be greatly improved due to the fact that the working frequency is higher (60KHz-200KHz) and the electronic ballast is guaranteed to work in a soft switching mode.
The inverter circuit 5 generates a lighting voltage necessary for the lamp 6 to light the lamp 6. Because the output frequency of the electronic ballast is as high as 60KHz-200KHz, the stroboscopic phenomenon is eliminated, and because the power factor correction circuit 3 and the booster circuit 4 at the front stage adopt BOOST circuit structures, the direct current bus voltage between the front stage and the rear stage is 800V, which is quite stable and does not fluctuate with the external power grid voltage, so the lamp tube 6 has quite stable energy output. The electronic ballast with the inverter protection can improve the power factor and the working efficiency, reduce the production cost, reduce the occupied volume of the whole circuit and prolong the service life of the whole ballast.
fig. 2 is a schematic circuit diagram of an inverter circuit in this embodiment, in fig. 2, the inverter circuit 5 includes a voltage input terminal Vin, a first IGBT P1, a first MOS transistor M1, a first capacitor C1, a second IGBT P2, a second MOS transistor M2, a first inductor L1, a second inductor L2, and a voltage output terminal Vo, wherein one end of the voltage input terminal Vin is connected to a collector of the first IGBT P1 and one end of the first capacitor C1, an emitter of the first IGBT P1 is connected to one end of the first inductor L1 and a drain of the first MOS transistor M1, another end of the first capacitor C1 is connected to a collector of the second IGBT P2, an emitter of the second IGBT P2 is connected to a drain of the second MOS transistor M2 and one end of the second inductor L2, another end of the voltage input terminal Vin is connected to a source of the first MOS transistor M1 and a source of the second MOS transistor M2, and another end of the first inductor L1 is connected to one end of the first inductor L2, the other end of the second inductor L2 is connected to the other end of the voltage output Vo.
Compared with the circuit part of the traditional electronic ballast, the inverter circuit 5 has the advantages of fewer used components, simpler circuit structure and convenient maintenance, and can reduce the hardware cost due to the fact that some components are saved. In addition, the first capacitor C1 is a coupling capacitor for preventing interference between the first IGBT tube P1 and the second IGBT tube P2, so that the safety and reliability of the circuit are high. It should be noted that in the present embodiment, the capacitance value of the first capacitor C1 is 150pF, and certainly, in practical applications, the capacitance value of the first capacitor C1 may be adjusted accordingly according to specific situations.
In this embodiment, the first IGBT tube P1, the first MOS tube M1, the first capacitor C1, the second IGBT tube P2, and the second MOS tube M2 constitute an inverter, an input end of the inverter is connected to the solar panel, an output end of the inverter is connected to the first inductor L1 and the second inductor L2, the first IGBT tube P1 and the second IGBT tube P2 constitute an upper arm of the inverter, and the first MOS tube M1 and the second MOS tube M2 constitute a lower arm of the inverter. The inverter is connected with the solar cell panel, direct current generated by the solar cell panel can be subjected to pulse width modulation through an upper bridge arm of the inverter, and then alternating current is output to drive alternating current loads such as household appliances, lighting and motor tools, and the first inductor L1 and the second inductor L2 are used for suppressing harmonic waves.
When the first IGBT tube P1 and the second IGBT tube P2 are subjected to pulse width modulation, the first MOS tube M1 and the second MOS tube M2 carry out phase change work according to the following procedures: in the positive half period, when the first IGBT transistor P1 performs pulse width modulation, the second MOS transistor M2 maintains the positive half period on operation, and the second IGBT transistor P2 and the first MOS transistor M1 keep off in the positive half period; during the negative half period, when the second IGBT transistor P2 is pulse-width modulated, the first MOS transistor M1 remains in the on state, and the first IGBT transistor P1 and the second MOS transistor M2 are turned off during the negative half period. The output waveform after pulse width modulation is filtered by the first inductor L1 and the second inductor L2, and then the sinusoidal alternating-current voltage with low harmonic can be obtained.
The IGBT tube is adopted to perform pulse width modulation at high frequency of 20kHz or above, and when the output sine alternating voltage is filtered, only the first inductor L1 and the second inductor L2 with small volumes are needed to be adopted, so that harmonic waves can be effectively suppressed.
In the positive half period of the pulse width modulation, the first IGBT tube P1 and the second MOS tube M2 are conducted simultaneously, the first IGBT tube P1 is switched to the working frequency of 20KHz or above, and at the moment, the second MOS tube M2 is switched to the frequency of 50Hz or 60Hz for phase change; and in the negative half period, the second IGBT tube P2 and the first MOS tube M1 are conducted simultaneously, the second IGBT tube P2 is switched to the working frequency of 20KHz or more, and at the moment, the first MOS tube M1 is switched to the frequency of 50Hz or 60Hz for phase change.
When the first MOS transistor M1 and the second MOS transistor M2 are conducted, the first MOS transistor M1 and the second MOS transistor M2 are switched to 50Hz or 60Hz low frequency for phase change, so that the switching loss and the conduction loss can be reduced, and the reliability of the inverter circuit 5 is improved.
In this embodiment, the first MOS transistor M1 and the second MOS transistor M2 are both N-channel MOS transistors.
In this embodiment, the inverter circuit 5 further includes a first diode D1, an anode of the first diode D1 is connected to one end of the voltage input terminal Vin, and a cathode of the first diode D1 is connected to a collector of the first IGBT P1 and one end of the first capacitor C1, respectively. The first diode D1 is a current limiting diode for current limiting protection to further enhance the safety and reliability of the circuit. It should be noted that in the present embodiment, the first diode D1 has a model number S-452T.
In this embodiment, the inverter circuit 5 further includes a second capacitor C2, one end of the second capacitor C2 is connected to the emitter of the first IGBT transistor P1, and the other end of the second capacitor C2 is connected to the drain of the first MOS transistor M1. The second capacitor C2 is a coupling capacitor for preventing interference between the first IGBT transistor P1 and the first MOS transistor M1, so as to further enhance the safety and reliability of the circuit. It should be noted that, in the embodiment, the capacitance of the second capacitor C2 is 260 pF.
in this embodiment, the inverter circuit 5 further includes a third capacitor C3, one end of the third capacitor C3 is connected to the emitter of the second IGBT transistor P2, and the other end of the third capacitor C3 is connected to the drain of the second MOS transistor M2. The third capacitor C3 is a coupling capacitor for preventing interference between the second IGBT transistor P2 and the second MOS transistor M2, so as to further enhance the effect of preventing signal interference. It should be noted that, in the present embodiment, the capacitance of the third capacitor C3 is 260 pF.
In a word, in this embodiment, compared with the circuit part of the conventional electronic ballast, the inverter circuit 5 has fewer used components, a simpler circuit structure and convenience in maintenance, and because some components are saved, the hardware cost can be reduced. In addition, since the inverter circuit 5 is provided with a coupling capacitor, the safety and reliability of the circuit are high.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An electronic ballast with inversion protection is characterized by comprising an electromagnetic compatibility circuit, a full-bridge soft start rectifying circuit, a power factor correction circuit, a booster circuit, an inverter circuit and a lamp tube, wherein the input end of the full-bridge soft start rectifying circuit is connected with the output end of the electromagnetic compatibility circuit, the input end of the power factor correction circuit is connected with the output end of the full-bridge soft start rectifying circuit, the input end of the booster circuit is connected with the output end of the power factor correction circuit, the input end of the inverter circuit is connected with the output end of the booster circuit, and the lamp tube is connected with the output end of the inverter circuit;
The inverter circuit comprises a voltage input end, a first IGBT (insulated gate bipolar transistor), a first MOS (metal oxide semiconductor) tube, a first capacitor, a second IGBT tube, a second MOS tube, a first inductor, a second inductor and a voltage output end, wherein one end of the voltage input end is respectively connected with a collector electrode of the first IGBT tube and one end of the first capacitor, an emitter electrode of the first IGBT tube is respectively connected with one end of the first inductor and a drain electrode of the first MOS tube, the other end of the first capacitor is connected with a collector electrode of the second IGBT tube, an emitter electrode of the second IGBT tube is respectively connected with a drain electrode of the second MOS tube and one end of the second inductor, the other end of the voltage input end is respectively connected with a source electrode of the first MOS tube and a source electrode of the second MOS tube, the other end of the first inductor is connected with one end of the voltage output end, and the other end of the second inductor is connected with the other end of the voltage output end, the capacitance value of the first capacitor is 150 pF.
2. The electronic ballast with inverter protection according to claim 1, wherein the inverter circuit further comprises a first diode, an anode of the first diode is connected to one end of the voltage input terminal, a cathode of the first diode is connected to a collector of the first IGBT tube and one end of a first capacitor, respectively, and the first diode is of type S-452T.
3. The electronic ballast with inverter protection according to claim 2, wherein the inverter circuit further comprises a second capacitor, one end of the second capacitor is connected to the emitter of the first IGBT transistor, the other end of the second capacitor is connected to the drain of the first MOS transistor, and the capacitance of the second capacitor is 260 pF.
4. The electronic ballast with inverter protection according to claim 3, wherein the inverter circuit further comprises a third capacitor, one end of the third capacitor is connected to the emitter of the second IGBT, the other end of the third capacitor is connected to the drain of the second MOS transistor, and the capacitance of the third capacitor is 260 pF.
5. The electronic ballast with the inverter protection function according to any one of claims 1 to 4, wherein the first MOS transistor and the second MOS transistor are both N-channel MOS transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822278741.2U CN209748876U (en) | 2018-12-31 | 2018-12-31 | Electronic ballast with inversion protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822278741.2U CN209748876U (en) | 2018-12-31 | 2018-12-31 | Electronic ballast with inversion protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209748876U true CN209748876U (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822278741.2U Expired - Fee Related CN209748876U (en) | 2018-12-31 | 2018-12-31 | Electronic ballast with inversion protection |
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| Country | Link |
|---|---|
| CN (1) | CN209748876U (en) |
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2018
- 2018-12-31 CN CN201822278741.2U patent/CN209748876U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191206 Termination date: 20211231 |