CN209748877U - Ballast circuit - Google Patents
Ballast circuit Download PDFInfo
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- CN209748877U CN209748877U CN201822278818.6U CN201822278818U CN209748877U CN 209748877 U CN209748877 U CN 209748877U CN 201822278818 U CN201822278818 U CN 201822278818U CN 209748877 U CN209748877 U CN 209748877U
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Abstract
The utility model discloses a ballast circuit, which comprises a filter circuit, a rectifying circuit, a power factor correction circuit, a starting circuit, a resonance circuit and a protection circuit, wherein the rectifying circuit is connected with the filter circuit, the power factor correction circuit is respectively connected with the rectifying circuit, the starting circuit and the resonance circuit, and the protection circuit is connected with the starting circuit and the resonance circuit; the protection 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 ballast circuit.
Background
The fluorescent lamp is a very popular lighting lamp, and is popular among the people due to high luminous efficiency and soft light. The ballast circuit is used as a driving circuit of the fluorescent lamp, so that the ballast circuit is very important. The ballast circuit in the prior art comprises a filter circuit, a rectifying circuit, a power factor correction circuit, a starting circuit and a resonant circuit, and after a protection circuit is arranged, the protection effect can be achieved, so that the working reliability of the ballast circuit is improved to a certain extent. However, the protection circuit in the conventional ballast circuit uses a large number of components, and has a complex circuit structure, high hardware cost and inconvenient maintenance. In addition, since the protection circuit portion in the conventional ballast circuit lacks a 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, a circuit structure is comparatively simple, the cost is lower, the convenient security and the higher ballast circuit of reliability of maintaining, circuit is provided.
The utility model provides a technical scheme that its technical problem adopted is: the ballast circuit comprises a filter circuit, a rectifying circuit, a power factor correction circuit, a starting circuit, a resonant circuit and a protection circuit, wherein the rectifying circuit is connected with the filter circuit, the power factor correction circuit is respectively connected with the rectifying circuit, the starting circuit and the resonant circuit, and the protection circuit is respectively connected with the starting circuit and the resonant circuit;
The protection 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 ballast circuit of the present invention, the protection circuit further includes 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.
In the ballast circuit of the present invention, the protection circuit further includes 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.
In the ballast circuit of the present invention, the protection 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 of the fifth resistor is 35k Ω.
in the ballast circuit of the present invention, the first transistor, the second transistor, and the third transistor are all NPN transistors.
Implement the utility model discloses a ballast circuit has following beneficial effect: the power factor correction circuit is provided with a filter circuit, a rectifying circuit, a power factor correction circuit, a starting circuit, a resonant circuit and a protection circuit; the protection 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 diagram of an embodiment of a ballast circuit of the present invention;
Fig. 2 is a circuit schematic diagram of the protection 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 an embodiment of the ballast circuit of the present invention, a schematic diagram of the ballast circuit is shown in fig. 1. In fig. 1, the ballast circuit includes a filter circuit 1, a rectifier circuit 2, a power factor correction circuit 3, a start circuit 4, a resonant circuit 5 and a protection circuit 6, the rectifier circuit 2 is connected to the filter circuit 1, the power factor correction circuit 3 is connected to the rectifier circuit 2, the start circuit 4 and the resonant circuit 5, respectively, and the protection circuit 6 is connected to the start circuit 4 and the resonant circuit 5, respectively. Can be right through protection circuit 6 the utility model discloses a ballast circuit plays the guard action to improve to a certain extent the utility model discloses ballast circuit's operational reliability.
In this embodiment, the filter circuit 1, the rectifier circuit 2, the power factor correction circuit 3, the start circuit 4, and the resonant 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 protection circuit, in fig. 2, the protection 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 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 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 R2 is connected to a cathode of the first resistor R4, and one end of the fourth resistor R1 is 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 protection circuit part in the traditional ballast circuit, the protection circuit 6 has the advantages of 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 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 protection 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 protection 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 protection 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 protection circuit part in the conventional ballast circuit, the protection 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, since the protection circuit 6 is provided with a current limiting diode and a current limiting resistor, 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. A ballast circuit is characterized by comprising a filter circuit, a rectifying circuit, a power factor correction circuit, a starting circuit, a resonant circuit and a protection circuit, wherein the rectifying circuit is connected with the filter circuit;
The protection 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 ballast circuit of claim 1, wherein the protection circuit further comprises a second capacitor, one terminal of the second capacitor is connected to the collector of the first transistor, the other terminal of the second capacitor is connected to the base of the second transistor, and the second capacitor has a capacitance of 280 pF.
3. The ballast circuit of claim 2, wherein the protection 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 third capacitor has a capacitance of 360 pF.
4. The ballast circuit according to claim 3, wherein the protection 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 ballast circuit according to any 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 |
|---|---|---|---|
| CN201822278818.6U CN209748877U (en) | 2018-12-31 | 2018-12-31 | Ballast circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822278818.6U CN209748877U (en) | 2018-12-31 | 2018-12-31 | Ballast circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209748877U true CN209748877U (en) | 2019-12-06 |
Family
ID=68704747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822278818.6U Expired - Fee Related CN209748877U (en) | 2018-12-31 | 2018-12-31 | Ballast circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209748877U (en) |
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2018
- 2018-12-31 CN CN201822278818.6U patent/CN209748877U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| 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 |