CN209748878U - Electronic ballast with protection function - Google Patents
Electronic ballast with protection function Download PDFInfo
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- CN209748878U CN209748878U CN201822278831.1U CN201822278831U CN209748878U CN 209748878 U CN209748878 U CN 209748878U CN 201822278831 U CN201822278831 U CN 201822278831U CN 209748878 U CN209748878 U CN 209748878U
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Abstract
The utility model discloses an electronic ballast with protection function, which comprises an EMI filter circuit, an active power factor correction circuit, a first half-bridge inverter output circuit, a second half-bridge inverter output circuit, a microcomputer control circuit and a power supply circuit, wherein the EMI filter circuit is connected with the active power factor correction circuit and the microcomputer control circuit; the power supply circuit comprises a voltage input end, a fourth resistor, a first capacitor, a third diode, a third resistor, a first voltage regulator tube, a first resistor, a second resistor, a first triode, a second triode, a third triode, a second voltage regulator tube and a voltage output end, wherein the voltage input end is respectively connected with the anode of the third diode, one end of the third resistor and one end of the fourth resistor, the cathode of the third diode is connected with the collector of the third triode, and the emitter of the third triode is connected with the 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 a ballast field, in particular to electronic ballast with protect function.
Background
The ballast is a device which plays a role in current limiting and generating instant high voltage on the fluorescent lamp, and is made by winding enameled wires on an iron core made of silicon steel, and when the coil with the iron core is powered on/off instantly, the coil can generate high voltage by self induction and is added on electrodes (filaments) at two ends of the fluorescent lamp tube. This action is performed alternately, when the starter (jump bulb) is closed, the filament of the lamp tube is conducted to generate heat through the current-limiting of the ballast; when the starter is opened, the ballast will generate high voltage by self-induction and apply it to the filaments at two ends of the lamp tube, the filaments emit electrons to bombard the fluorescent powder on the tube wall to give out light, and the starter is turned on and off several times, and the lamp tube is turned on. When the lamp tube is normally lighted, the internal resistance is reduced, and the starter is always kept in an open circuit state, so that the current stably passes through the lamp tube and the ballast to work, and the lamp tube is normally lighted.
The ballast is divided into an inductive ballast and an electronic ballast, and the inductive ballast works at the frequency of power frequency mains supply, has large volume and heavy weight, consumes a large amount of metal materials such as copper, silicon steel and the like, has the defects of difficult heat dissipation, low working efficiency, stroboflash caused by light emitting of a lamp and the like, and is gradually replaced by the electronic ballast. However, the power supply part of the conventional electronic ballast uses many components, the circuit structure is complex, the hardware cost is high, and the maintenance is inconvenient. In addition, since the power supply part in the conventional electronic ballast lacks the corresponding circuit protection function, for example: the safety and reliability of the circuit are poor due to the lack of the current-limiting protection function.
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 with protect function of reliability of circuit.
The utility model provides a technical scheme that its technical problem adopted is: an electronic ballast with a protection function is constructed, and comprises an EMI filter circuit, an active power factor correction circuit, a first half-bridge inverter output circuit, a second half-bridge inverter output circuit, a microcomputer control circuit and a power supply circuit, wherein the EMI filter circuit is respectively connected with the active power factor correction circuit and the microcomputer control circuit;
The power supply circuit comprises a voltage input end, a fourth resistor, a first capacitor, a third diode, a third resistor, a first voltage regulator tube, a first resistor, a second resistor, a first triode, a second triode, a third triode, a second voltage regulator tube and a voltage output end, wherein the voltage input end is respectively connected with an anode of the third diode, one end of the third resistor and one end of the fourth resistor, a cathode of the third diode is connected with a collector of the third triode, an emitter of the third triode is connected with the voltage output end, the other end of the third resistor is respectively connected with a collector of the second triode, a base of the third triode and an anode of the second voltage regulator tube, a cathode of the second voltage regulator tube is grounded, and the other end of the fourth resistor is respectively connected with one end of the first capacitor and a cathode of the first voltage regulator tube, The collector of a first triode is connected with the base of a second triode, the anode of a first voltage regulator tube is respectively connected with one end of a first resistor and one end of a second resistor, the other end of the second resistor is connected with the base of the first triode, the other end of a first capacitor, the other end of the first resistor, the emitter of the first triode and the emitter of the second triode are all grounded, the type of a third diode is E-822, and the resistance value of a fourth resistor is 42k omega.
In the electronic ballast with protection function of the present invention, the power supply circuit further includes a second capacitor, one end of the second capacitor is connected to the collector of the first triode, the other end of the second capacitor is connected to the base of the second triode, and the capacitance of the second capacitor is 280 pF.
In the electronic ballast with protection function of the present invention, the power supply circuit further includes a third capacitor, one end of the third capacitor is connected to the collector of the second triode, the other end of the third capacitor is connected to the base of the third triode, and the capacitance of the third capacitor is 360 pF.
In the electronic ballast with protection function of the present invention, the power supply circuit further includes a fifth resistor, one end of the fifth resistor is connected to the emitter of the second triode, the other end of the fifth resistor is grounded, and the resistance value of the fifth resistor is 35k Ω.
In the electronic ballast with protection function of the present invention, the first transistor, the second transistor and the third transistor are all NPN transistors.
Implement the utility model discloses an electronic ballast with protect function has following beneficial effect: the power supply circuit is provided with an EMI filter circuit, an active power factor correction circuit, a first half-bridge inverter output circuit, a second half-bridge inverter output circuit, a microcomputer control circuit and a power supply circuit; the power supply circuit comprises a voltage input end, a fourth resistor, a first capacitor, a third diode, a third resistor, a first voltage regulator tube, a first resistor, a second resistor, a first triode, a second triode, a third triode, a second voltage regulator tube and a voltage output end.
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 a protection function according to the present invention;
Fig. 2 is a circuit schematic of the power supply 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 protection function of the present invention, a schematic structural diagram of the electronic ballast with protection function is shown in fig. 1. In fig. 1, the electronic ballast with protection function includes an EMI filter circuit 1, an active power factor correction circuit 2, a first half-bridge inverter output circuit 3, a second half-bridge inverter output circuit 4, a microcomputer control circuit 5 and a power supply circuit 6, where the EMI filter circuit 1 is connected to the active power factor correction circuit 2 and the microcomputer control circuit 5, the active power factor correction circuit 2 is connected to the first half-bridge inverter output circuit 3 and the second half-bridge inverter output circuit 4, the first half-bridge inverter output circuit 3 and the second half-bridge inverter output circuit 4 are both connected to the microcomputer control circuit 5, and the power supply circuit 6 is connected to the microcomputer control circuit 5.
The EMI filter circuit 1 can well inhibit the interference of electromagnetic waves, frequency skimming and electromagnetic pulses. The microcomputer control circuit 5 uses a single chip microcomputer as a core control IC to realize the intelligent control of the electronic ballast with the protection function, and can realize the functions of dimming, preheating current adjustment, preheating time adjustment, lamp tube service life calculation, filament current reduction, RS485 communication and the like. The power supply circuit 6 is used for supplying power required for operation.
The electronic ballast with the protection function has soft start, the lamp filament is preheated, and the service life of the lamp tube is prolonged. The lamp with the filament protection function can reduce more than half of current carried by the filament when the lamp works, and the service life of the filament is effectively prolonged. The LED lamp is provided with a 485 communication interface, can effectively communicate with an upper computer, and can remotely control dimming, intelligent control, calculation of the service life of a lamp tube and the like. The active power factor correction function is realized, the high power factor is larger than 1, the harmonic wave is low, and the pollution to a power grid can be reduced.
in this embodiment, the EMI filter circuit 1, the active power factor correction circuit 2, the first half-bridge inverter output circuit 3, the second half-bridge inverter output circuit 4, and the microcomputer control circuit 5 all adopt circuit structures in the prior art, and the control process and principle thereof are well known in the prior art and are not described herein again.
Fig. 2 is a schematic circuit diagram of the present power supply circuit, in fig. 2, the power supply circuit 6 includes a voltage input terminal Vin, a fourth resistor R4, a first capacitor C1, a third diode D3, a third resistor R3, a first voltage regulator D1, a first resistor R1, a second resistor R2, a first transistor Q1, a second transistor Q2, a third transistor Q3, a second voltage regulator D2, and a voltage output terminal Vo, wherein the voltage input terminal Vin is respectively connected to an anode of the third diode D3, one end of the third resistor R3, and one end of the fourth resistor R4, a cathode of the third diode D3 is connected to a collector of the third transistor Q3, an emitter of the third transistor Q3 is connected to the voltage output terminal Vo, the other end of the third resistor R3 is respectively connected to a collector of the second transistor Q2, a base of the third transistor Q3, and an anode of the second transistor D2, the other end of the second resistor R3 is respectively connected to a cathode 828653, and a cathode of the fourth resistor R86 4 is respectively connected to a ground, The cathode of a first voltage-regulator tube D1, the collector of a first triode Q1 and the base of a second triode Q2 are connected, the anode of the first voltage-regulator tube D1 is respectively connected with one end of a first resistor R1 and one end of a second resistor R2, the other end of the second resistor R2 is connected with the base of the first triode Q1, and the other end of a first capacitor C1, the other end of a first resistor R1, the emitter of the first triode Q1 and the emitter of the second triode Q2 are all grounded.
Compared with the power supply part in the traditional electronic ballast, the power supply circuit 6 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 third diode D3 is a current limiting diode for performing current limiting protection on the collector current of the third transistor Q3, and the fourth resistor R4 is a current limiting resistor for performing current limiting protection, so that the safety and reliability of the circuit are high. It should be noted that in this embodiment, the model of the third diode D3 is E-822, and the resistance of the fourth resistor R4 is 42k Ω, but in practical applications, the third diode D3 may also be a diode with other models and similar functions, and the resistance of the fourth resistor R4 may be adjusted accordingly according to specific situations.
When the voltage of the voltage input end Vin is lower than the threshold value of the first voltage regulator tube D1, the first voltage regulator tube D1 is cut off, no current passes through the first voltage regulator tube D1, the first triode Q1 works in a saturation state, the base voltage of the second triode Q2 is pulled down, the second triode Q2 works in a cut-off state, and the input of the voltage input end Vin is not influenced, so that under the normal working condition, the input voltage of the voltage input end Vin is always lower than the breakdown voltage of the first voltage regulator tube D1, and the voltage input end Vin normally inputs; when the voltage of the voltage input end Vin is higher than the threshold voltage of the first voltage regulator tube D1, the first voltage regulator tube D1 is broken down, current passes through the first voltage regulator tube D1, the first triode Q1 works in a cut-off state, the base voltage of the second triode Q2 rises, the second triode Q2 is conducted and works in a saturation state, the base voltage of the third triode Q3 used for adjusting the voltage of the voltage input end Vin is pulled down, the third triode Q3 works in a cut-off state, and the voltage output end Vo does not output, so that the purpose of overvoltage protection is achieved.
In this embodiment, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all NPN transistors. Of course, in practical applications, the first transistor Q1, the second transistor Q2, and the third transistor Q3 may also be PNP transistors, but the structure of the circuit is also changed accordingly.
In this embodiment, the power supply circuit 6 further includes a second capacitor C2, one end of the second capacitor C2 is connected to the collector of the first transistor Q1, and the other end of the second capacitor C2 is connected to the base of the second transistor Q2. The second capacitor C2 is a coupling capacitor for preventing interference between the first transistor Q1 and the second transistor Q2, so as to further enhance the safety and reliability of the circuit. It should be noted that in the present embodiment, the capacitance of the second capacitor C2 is 280pF, and certainly, in practical applications, the capacitance of the second capacitor C2 may be adjusted accordingly according to specific situations.
In this embodiment, the power supply circuit 6 further includes a third capacitor C3, one end of the third capacitor C3 is connected to the collector of the second transistor Q2, and the other end of the third capacitor C3 is connected to the base of the third transistor Q3. The third capacitor C3 is a coupling capacitor for preventing interference between the second transistor Q2 and the third transistor Q3, so as to further enhance the safety and reliability of the circuit. It should be noted that in the present embodiment, the capacitance of the third capacitor C3 is 360pF, and certainly, in practical applications, the capacitance of the third capacitor C3 may be adjusted accordingly according to specific situations.
In this embodiment, the power supply circuit 6 further includes a fifth resistor R5, one end of the fifth resistor R5 is connected to the emitter of the second transistor Q2, and the other end of the fifth resistor R5 is grounded. The fifth resistor R5 is a current limiting resistor, and is used for performing current limiting protection on the emitter current of the second transistor Q2, so as to further enhance the current limiting effect. It should be noted that, in the embodiment, the resistance of the fifth resistor R5 is 35k Ω, and certainly, in practical applications, the resistance of the fifth resistor R5 may be adjusted accordingly according to specific situations.
in a word, in this embodiment, compared with the power supply part in the conventional electronic ballast, the power supply circuit 6 has fewer used components, simpler circuit structure and convenient maintenance, and can reduce the hardware cost due to the saving of some components. In addition, the power supply circuit 6 is provided with a current limiting diode and a current limiting resistor, so that 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 a protection function is characterized by comprising an EMI filter circuit, an active power factor correction circuit, a first half-bridge inverter output circuit, a second half-bridge inverter output circuit, a microcomputer control circuit and a power supply circuit, wherein the EMI filter circuit is respectively connected with the active power factor correction circuit and the microcomputer control circuit;
The power supply circuit comprises a voltage input end, a fourth resistor, a first capacitor, a third diode, a third resistor, a first voltage regulator tube, a first resistor, a second resistor, a first triode, a second triode, a third triode, a second voltage regulator tube and a voltage output end, wherein the voltage input end is respectively connected with an anode of the third diode, one end of the third resistor and one end of the fourth resistor, a cathode of the third diode is connected with a collector of the third triode, an emitter of the third triode is connected with the voltage output end, the other end of the third resistor is respectively connected with a collector of the second triode, a base of the third triode and an anode of the second voltage regulator tube, a cathode of the second voltage regulator tube is grounded, and the other end of the fourth resistor is respectively connected with one end of the first capacitor and a cathode of the first voltage regulator tube, The collector of a first triode is connected with the base of a second triode, the anode of a first voltage regulator tube is respectively connected with one end of a first resistor and one end of a second resistor, the other end of the second resistor is connected with the base of the first triode, the other end of a first capacitor, the other end of the first resistor, the emitter of the first triode and the emitter of the second triode are all grounded, the type of a third diode is E-822, and the resistance value of a fourth resistor is 42k omega.
2. The electronic ballast with protection function according to claim 1, wherein the power supply circuit further comprises a second capacitor, one end of the second capacitor is connected to the collector of the first transistor, the other end of the second capacitor is connected to the base of the second transistor, and the capacitance of the second capacitor is 280 pF.
3. The electronic ballast with protection function according to claim 2, wherein the power supply circuit further comprises a third capacitor, one end of the third capacitor is connected to the collector of the second transistor, the other end of the third capacitor is connected to the base of the third transistor, and the capacitance of the third capacitor is 360 pF.
4. the electronic ballast with protection function according to claim 3, wherein the power supply circuit further comprises a fifth resistor, one end of the fifth resistor is connected to the emitter of the second transistor, the other end of the fifth resistor is grounded, and the resistance of the fifth resistor is 35k Ω.
5. The electronic ballast with the protection function according to any one of claims 1 to 4, wherein the first transistor, the second transistor and the third transistor are NPN transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822278831.1U CN209748878U (en) | 2018-12-31 | 2018-12-31 | Electronic ballast with protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822278831.1U CN209748878U (en) | 2018-12-31 | 2018-12-31 | Electronic ballast with protection function |
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| Publication Number | Publication Date |
|---|---|
| CN209748878U true CN209748878U (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822278831.1U Expired - Fee Related CN209748878U (en) | 2018-12-31 | 2018-12-31 | Electronic ballast with protection function |
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| CN (1) | CN209748878U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346729A (en) * | 2021-06-10 | 2021-09-03 | 西安微电子技术研究所 | Circuit for controlling rising time of output voltage of switching power supply |
-
2018
- 2018-12-31 CN CN201822278831.1U patent/CN209748878U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113346729A (en) * | 2021-06-10 | 2021-09-03 | 西安微电子技术研究所 | Circuit for controlling rising time of output voltage of switching power supply |
| CN113346729B (en) * | 2021-06-10 | 2023-05-12 | 西安微电子技术研究所 | Circuit for controlling rising time of output voltage of switching power supply |
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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 |