Bipolar switch conversion circuit and gas discharge lamp

Abstract

The utility model relates to the technical field of power supply conversion, and discloses a bipolar switch conversion circuit and a gas discharge lamp, which comprise a gas discharge assembly, an alternating current power supply end, a transformer, a switch driving circuit, a first switch circuit and a second switch circuit. The input AC voltage is processed through the first switch circuit, the second switch circuit and the switch driving circuit, when the AC voltage is positive to the ground, a pulse with a large positive value is output through the transformer, and when the AC voltage is negative to the ground, a pulse with a large negative value is output through the transformer, a bidirectional pulse type electric field and a stable discharge electric field are provided, and in the period of the AC voltage, the output voltage is stable. And the discharge current is alternately carried out in the positive pulse train envelope and the negative pulse train envelope. The problems of discharge medium migration and the like caused by a direct-current discharge mode can be avoided by overturning the discharge direction for a long time, and the adverse effect on the illumination effect of the gas discharge lamp caused by the arc bead rolling phenomenon generated by the symmetrical high-frequency envelope of a conventional converter can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power conversion, in particular to a bipolar switch conversion circuit and a gas discharge lamp. Background Art

[0002] In the prior art, when designing and using gas discharge lamps, it is necessary to ensure that the circuit design and voltage supply meet the breakdown voltage limit of the lamp to avoid damaging the lamp tube or reducing the life of the lamp. Some gas discharge lamps are discharged using a fixed polarity power supply. Although the fixed polarity discharge can have strong stability and rigidity, it will cause polarization to the discharge device, such as migration of the discharge medium, increased electrode voltage drop, and increased equivalent internal resistance of the electron emission material.

[0003] More designs will use circuits that generate symmetrical high-frequency envelopes to discharge gas discharge lamps. During the gas discharge process in the lamp tube, electrons are captured by ions and transition from the ion's high-energy orbit to a low-energy orbit to generate photons. Due to the difference frequency effect of the high-frequency envelope discharge, a "rolling phenomenon" observable to the naked eye is formed, affecting the lighting effect of the lamp. Utility Model Content

[0004] The purpose of the utility model is to provide a bipolar switch conversion circuit and a gas discharge lamp to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The utility model solves the technical problem by providing a bipolar switch conversion circuit and a gas discharge lamp.

[0006] In an embodiment of the first aspect of the present utility model, a bipolar switch conversion circuit includes:

[0007] Gas discharge components;

[0008] An AC power supply terminal, the AC power supply terminal is used to output an AC voltage;

[0009] A transformer, wherein the transformer is provided with a primary winding and a secondary winding, the primary winding is connected to the AC power supply terminal, and the secondary winding is connected to the gas discharge component;

[0010] A switch driving circuit, wherein the switch driving circuit is connected to the primary winding and the AC power supply end respectively;

[0011] A first switch circuit, wherein the first switch circuit is connected to the primary winding and the switch drive circuit respectively, wherein a drive end of the first switch circuit is connected to a control end of the switch drive circuit;

[0012] The second switch circuit is connected to the AC power supply end, the switch drive circuit and the first switch circuit respectively, wherein the drive end of the second switch circuit is connected to the control end of the switch drive circuit.

[0013] Further, the primary winding comprises:

[0014] A first primary coil, wherein the first primary coil is connected to an AC power supply terminal and a first switch circuit respectively;

[0015] a second primary coil, one end of the second primary coil being connected to the switch driving circuit and the other end of the second primary coil being grounded;

[0016] A third primary coil, one end of the third primary coil is connected to the other end of the second primary coil, and the other end of the third primary coil is connected to the switch drive circuit.

[0017] Furthermore, the first switch circuit comprises:

[0018] a first rectifying and current limiting circuit, wherein the first rectifying and current limiting circuit is respectively connected to the second switch circuit and the switch driving circuit;

[0019] a first switch tube, wherein the gate of the first switch tube is connected to the switch drive circuit through the first rectifier current limiting circuit, the drain of the first switch tube is connected to the first primary coil, and the source of the first switch tube is connected to the switch drive circuit;

[0020] A first resistor, one end of which is connected to the source of the first switch tube, and the other end of which is grounded.

[0021] Further, the second switch circuit comprises:

[0022] a second rectifying and current limiting circuit, wherein the second rectifying and current limiting circuit is respectively connected to the first rectifying and current limiting circuit and the switch driving circuit;

[0023] a second switch tube, wherein the gate of the second switch tube is connected to the switch drive circuit through the second rectifier current limiting circuit, the drain of the second switch tube is connected to the AC power supply end, and the source of the second switch tube is connected to the switch drive circuit;

[0024] A second resistor, one end of the second resistor is connected to the source of the second switch tube, and the other end of the second resistor is grounded.

[0025] Furthermore, the switch driving circuit comprises:

[0026] A switch driving chip, wherein a regulating end of the switch driving chip is respectively connected to a driving end of the first switch circuit and a driving end of the second switch circuit;

[0027] a common cathode diode group, wherein an anode of the common cathode diode group is connected to the second primary coil and the third primary coil respectively, and a cathode of the common cathode diode group is connected to a power supply terminal of the switch driving chip;

[0028] A voltage-stabilizing and voltage-dividing circuit is connected to the AC power supply end and the power supply end of the switch driving chip respectively.

[0029] Furthermore, the first rectifying and current limiting circuit comprises:

[0030] a first diode, wherein an anode of the first diode is connected to a gate of the first switch tube, and a cathode of the first diode is connected to a second switch circuit and a switch driving circuit respectively;

[0031] A third resistor is connected in parallel with the first diode.

[0032] Furthermore, the second rectifying and current limiting circuit comprises:

[0033] a second diode, wherein an anode of the second diode is connected to a gate of the second switch tube, and a cathode of the second diode is connected to the first rectifying current limiting circuit and the switch driving circuit respectively;

[0034] A fourth resistor is connected in parallel with the second diode.

[0035] Further, the switch driving circuit further comprises: a feedback resistor;

[0036] One end of the feedback resistor is connected to the voltage-stabilizing voltage divider circuit and the cathode of the parallel diode group respectively, and the other end of the feedback resistor is connected to the feedback end of the switch driving chip.

[0037] Furthermore, the switch driver chip is a UC3843 switch driver chip.

[0038] In an embodiment of the second aspect of the present utility model, a gas discharge lamp comprises a bipolar switch conversion circuit as described in the embodiment of the first aspect of the present utility model.

[0039] The beneficial effect of the utility model is: the input AC voltage is processed by the first switch circuit, the second switch circuit and the switch drive circuit, when it is positive to the ground, a pulse with a large positive value is output through the transformer, and when it is negative to the ground, a pulse with a large negative value is output through the transformer, providing a bidirectional pulse electric field, stabilizing the discharge electric field, so that in the cycle of the AC voltage, the discharge current alternates between the positive pulse group envelope and the negative pulse group envelope, that is, the polarity changes during this longer period of the mains cycle. Compared with discharge equipment with fixed polarity, reversing the direction of discharge in a slightly longer period of time can avoid the problems of discharge medium migration, increased electrode voltage drop, increased equivalent internal resistance of electron emission materials, etc. caused by the DC discharge mode, and reduce the occurrence of "balling phenomenon" compared with the circuit with symmetrical high-frequency envelope, which has an adverse effect on the lighting effect of the gas discharge lamp. When the first switch circuit and the second switch circuit are turned on, the transformer stores energy, and the voltage at the output end cannot break down the discharge gas. When the first switch circuit and the second switch circuit are turned off, the stored energy of the transformer generates a very high induced voltage on the secondary winding, which performs pulse discharge on the discharge gas, making the pulse discharge more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a circuit diagram of a bipolar switch conversion circuit provided by an embodiment of the utility model;

[0041] Figure 2 This is a circuit diagram of a bipolar switch conversion circuit provided by another embodiment of the utility model;

[0042] Figure 3 It is a schematic diagram of a framework of a bipolar switch conversion circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and cannot be understood as limiting the present utility model.

[0044] It should be noted that although the functional module division is performed in the schematic diagram, in some cases, the module division can be different from that in the system.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0047] Most of the time, a fixed polarity power supply is used to discharge the gas discharge lamp. The fixed polarity discharge can have strong stability and rigidity, but for the discharge device, there will be polarization, such as the migration of the discharge medium, the increase of the electrode voltage drop, the increase of the equivalent internal resistance of the electron emission material, etc. The gas discharge lamp is discharged by a circuit that generates a symmetrical high-frequency envelope. During the gas discharge process in the lamp tube, the electrons are captured by the ions and jump from the high-energy orbit of the ions to the low-energy orbit to generate photons. Due to the difference frequency effect of the high-frequency envelope discharge, a "rolling phenomenon" that can be observed by the naked eye is formed, which will affect the lighting effect of the lamp.

[0048] Reference Figures 1 to 3 In some embodiments of the present invention, a bipolar switch conversion circuit includes: a gas discharge component, an AC power supply end 400, a transformer T1, a switch drive circuit 300, a first switch circuit 100 and a second switch circuit 200.

[0049] The AC power supply end 400 can output an AC voltage, wherein the AC voltage may be a mains voltage, that is, an AC voltage of 220V and 50Hz.

[0050] The transformer T1 is provided with a primary winding and a secondary winding. The primary winding is electrically connected to the AC power supply end 400, and the secondary winding is electrically connected to the gas discharge assembly. The transformer T1 is used to step down the AC voltage supplied by the AC power supply end 400.

[0051] The switch driving circuit 300 is electrically connected to the primary winding, the switch driving circuit 300 is electrically connected to the AC power supply end 400, the regulating end of the switch driving circuit 300 is electrically connected to the driving end of the first switch circuit 100, and the regulating end of the switch driving circuit 300 is electrically connected to the driving end of the second switch circuit 200.

[0052] The switch driving circuit 300 is used to adjust the duty cycle of the pulse signal and output the adjusted pulse signal to the first switch circuit 100 and the second switch circuit 200 to control the on and off of the first switch circuit 100 and the on and off of the second switch circuit 200, thereby adjusting the primary winding of the transformer T1 to process the AC voltage.

[0053] The first switch circuit 100 is electrically connected to the primary winding, and the driving end of the first switch circuit 100 is electrically connected to the regulating end of the switch driving circuit 300. The first switch circuit 100 is used to receive the regulated pulse signal, and by adjusting its own on and off, the transformer T1 processes the positive half-cycle voltage in the AC voltage and provides a positive pulse.

[0054] The second switch circuit 200 is electrically connected to the AC power supply terminal 400, and the driving terminal of the second switch circuit 200 is electrically connected to the regulating terminal of the switch driving circuit 300, that is, the second switch circuit 200 is electrically connected to the first switch circuit 100 through the regulating terminal of the switch driving circuit 300. The second switch circuit 200 is used to receive the regulated pulse signal, and by adjusting its own on and off, the transformer T1 processes the negative half-cycle voltage in the AC voltage and provides a negative pulse.

[0055] The bipolar switch conversion circuit in the utility model can provide a bidirectional pulse electric field for the gas discharge field. When the AC voltage is positive to the ground, the electric field is expressed as a positive pulse through the transformer T1, and when the AC voltage is negative to the ground, it is expressed as a negative pulse. In order to form a bidirectional pulse electric field, the first switch circuit 100 and the second switch circuit 200 are turned on by the switch drive circuit 300, and the transformer T1 stores energy. At this time, the output voltage of the transformer T1 cannot break through the discharge gas; when the first switch circuit 100 and the second switch circuit 200 are turned off by the switch drive circuit 300, the energy storage of the transformer T1 generates a very high induced voltage on the secondary winding, and the discharge gas is pulsed discharged. When the transformer T1 is discharged by energy storage, the voltage value of the induced voltage is high, which improves the reliability and stability of the discharge of the discharge gas.

[0056] The direction of the discharge current generated by the pulse discharge changes synchronously with the direction of the live wire at the AC power supply end 400 relative to the neutral wire. For the discharge circuit, the energy of the pulse group of the positive pulse and the pulse group of the negative pulse are equal after a long average. In terms of the cycle of the AC voltage, the pulse discharge alternates between the envelope of the pulse group of the positive pulse and the envelope of the pulse group of the negative pulse, that is, the polarity change can be shown in the longer period of time of the cycle.

[0057] This can solve the polarization problems in the discharge with fixed polarity, such as migration of the discharge medium, increased electrode voltage drop and increased equivalent internal resistance of the electron emission material. Reversing the direction of the discharge during this longer period of time can not only reduce the occurrence of the above problems, but also reduce the occurrence of the "balling phenomenon" of symmetrical high-frequency envelope discharge, which has an adverse effect on the lighting effect of the gas discharge lamp.

[0058] Reference Figures 1 to 3In some embodiments of the present invention, the primary winding includes: a first primary coil, a second primary coil and a third primary coil.

[0059] One end of the first primary coil is electrically connected to the AC power supply end 400 , and the other end of the first primary coil is electrically connected to the first switch circuit 100 .

[0060] One end of the second primary coil is electrically connected to the switch driving circuit 300, and the other end of the second primary coil is electrically connected to the ground terminal. One end of the third primary coil is electrically connected to the other end of the second primary coil.

[0061] That is, one end of the third primary coil is electrically connected to the ground terminal, and the other end of the third primary coil is electrically connected to the switch driving circuit 300 .

[0062] Reference Figures 1 to 3 In some embodiments of the present invention, the first switch circuit 100 includes: a first resistor R1, a first switch tube Q1 and a first rectifier current limiting circuit.

[0063] The drain of the first switch tube Q1 is electrically connected to the other end of the first primary coil, the gate of the first switch tube Q1 is electrically connected to the first rectifier current limiting circuit, and the first rectifier current limiting circuit is electrically connected to the regulating end of the switch drive circuit 300, so that the gate of the switch tube is electrically connected to the switch drive circuit 300. That is, the driving end of the switch circuit is electrically connected to the regulating end of the switch drive circuit 300.

[0064] The first rectifying current limiting circuit is also electrically connected to the second switch circuit 200. The source of the first switch tube Q1 is electrically connected to one end of the first resistor R1, and the other end of the first resistor R1 is electrically connected to the ground terminal. The source of the first switch tube Q1 is also electrically connected to the switch driving circuit 300.

[0065] Wherein, the first rectifying current limiting circuit includes: a first diode D1 and a third resistor R3.

[0066] The anode of the first diode D1 is electrically connected to the gate of the first switch tube Q1 , the cathode of the first diode D1 is electrically connected to the second switch circuit 200 , and the cathode of the first diode D1 is also electrically connected to the control end of the switch drive circuit 300 .

[0067] The third resistor R3 is connected in parallel with the first diode D1, one end of the third resistor R3 is electrically connected to the gate of the first switch tube Q1 and the anode of the first diode D1 respectively, and the other end of the third resistor R3 is electrically connected to the second switch circuit 200, the control end of the switch drive circuit 300 and the cathode of the first diode D1 respectively.

[0068] Reference Figures 1 to 3In some embodiments of the present invention, the second switch circuit 200 includes: a second resistor R2, a second switch tube Q2 and a second rectifier current limiting circuit.

[0069] The drain of the second switch tube Q2 is electrically connected to the AC power supply terminal 400, the gate of the second switch tube Q2 is electrically connected to the second rectifier current limiting circuit, and the second rectifier current limiting circuit is electrically connected to the control terminal of the switch drive circuit 300, so that the gate of the switch tube is electrically connected to the switch drive circuit 300. That is, the drive terminal of the switch circuit is electrically connected to the control terminal of the switch drive circuit 300.

[0070] The second rectifier current limiting circuit is also electrically connected to the first rectifier current limiting circuit, the source of the second switch tube Q2 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to the ground end, and the source of the second switch tube Q2 is also electrically connected to the switch driving circuit 300.

[0071] The second rectifying and current limiting circuit includes: a second diode D2 and a fourth resistor R4.

[0072] The anode of the second diode D2 is electrically connected to the gate of the second switch tube Q2 , the cathode of the second diode D2 is also electrically connected to the cathode of the first diode D1 , and the cathode of the second diode D2 is electrically connected to the control end of the switch drive circuit 300 .

[0073] The fourth resistor R4 is connected in parallel with the second diode D2, one end of the fourth resistor R4 is electrically connected to the gate of the second switch tube Q2 and the anode of the second diode D2 respectively, and the other end of the fourth resistor R4 is electrically connected to the cathode of the first diode D1, the regulating end of the switch drive circuit 300 and the cathode of the second diode D2 respectively.

[0074] The first switch tube Q1 in the first switch circuit 100 and the second switch tube Q2 in the second switch circuit 200 are driven and controlled by the switch driving circuit 300, thereby forming a bipolar switching power supply, generating a bidirectional pulsed electric field, and outputting a pulse voltage with changing polarity.

[0075] Reference Figures 1 to 3 In some embodiments of the present invention, the switch driving circuit 300 includes: a switch driving chip U1, a feedback resistor R6, a third diode D3, a fourth diode D4, a sampling resistor R7, a common cathode diode group and a voltage stabilizing voltage divider circuit.

[0076] The anode of the third diode D3 is electrically connected to the source of the first switch tube Q1, and the anode of the third diode D3 is also electrically connected to one end of the first resistor R1 to achieve electrical connection with the first switch circuit 100, and the cathode of the third diode D3 is electrically connected to one end of the sampling resistor R7.

[0077] The anode of the fourth diode D4 is electrically connected to the source of the second switch tube Q2, the anode of the third diode D3 is also electrically connected to one end of the first resistor R1 to achieve electrical connection with the first switch circuit 100, and the cathode of the third diode D3 is electrically connected to one end of the sampling resistor R7.

[0078] The other end of the sampling resistor R7 is electrically connected to the sampling end of the switch driving chip U1 , that is, electrically connected to the third pin of the switch driving chip U1 .

[0079] The common cathode diode group includes a fifth diode D5 and a sixth diode D6.

[0080] The anode of the fifth diode D5 is electrically connected to one end of the second primary coil, and the anode of the sixth diode D6 is electrically connected to the other end of the third primary coil, so that the anode is electrically connected to one end of the second primary coil and the other end of the third primary coil respectively.

[0081] The cathode of the fifth diode D5 and the cathode of the sixth diode D6 are both electrically connected to the power supply terminal of the switch driving chip U1 , that is, electrically connected to the seventh pin of the switch driving chip U1 .

[0082] The regulating end of the switch driving chip U1 is electrically connected to the gate of the first switch tube Q1 through the first diode D1 and the first resistor R1, and the regulating end of the switch driving chip U1 is electrically connected to the gate of the second switch tube Q2 through the second diode D2 and the second resistor R2 to control the on and off of the first switch circuit 100 and the on and off of the second switch circuit 200.

[0083] The voltage stabilizing and voltage dividing circuit includes: a seventh diode D7 and a fifth resistor R5.

[0084] The anode of the seventh diode D7 is electrically connected to one end of the first primary coil and the AC power supply terminal 400. The cathode of the seventh diode D7 is electrically connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is electrically connected to the power supply terminal of the switch driving chip U1, that is, electrically connected to the seventh pin of the switch driving chip U1.

[0085] The other end of the fifth resistor R5 is also electrically connected to one end of the feedback resistor R6, and one end of the feedback resistor R6 is also electrically connected to the cathode of the fifth diode D5 and the cathode of the sixth diode D6 respectively. The other end of the feedback resistor R6 is electrically connected to the feedback end of the switch driver chip U1, that is, electrically connected to the second pin of the switch driver chip U1.

[0086] The switch driving chip U1 is a UC3843 chip. In this embodiment, other types of switch driving chips U1 can be used to drive the dual switch circuit to form a bipolar pulse electric field.

[0087] The switch driving circuit 300 further includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5.

[0088] One end of the first capacitor C1 is electrically connected to the sampling resistor R7, the other end of the first capacitor C1 is electrically connected to the ground end, one end of the second capacitor C2 is electrically connected to the fourth pin of the switch driving chip U1 and one end of the ninth resistor R9 respectively, and the other end of the second capacitor C2 is electrically connected to the ground end.

[0089] The other end of the ninth resistor R9 is electrically connected to one end of the third capacitor C3, one end of the third capacitor C3 is also electrically connected to the eighth pin of the switch driving chip U1, and the other end of the third capacitor C3 is electrically connected to the ground end.

[0090] The fourth capacitor C4 is connected in parallel with the eighth resistor R8 , one end of the fourth capacitor C4 is electrically connected to the first pin of the switch driver chip U1 , and the other end of the fourth capacitor C4 is electrically connected to the second pin of the switch driver chip U1 .

[0091] One end of the eighth resistor R8 is electrically connected to the first pin of the switch driving chip U1, the other end of the eighth resistor R8 is electrically connected to the second pin of the switch driving chip U1, the other end of the eighth resistor R8 is also electrically connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is electrically connected to the ground terminal.

[0092] The positive electrode of the fifth capacitor C5 is electrically connected to the power supply end of the switch driving chip U1, the cathode of the sixth diode, one end of the feedback resistor R6 and the other end of the fifth resistor R5, and the negative electrode of the fifth capacitor C5 is electrically connected to the ground end.

[0093] When the first switch circuit 100 and the second switch circuit 200 are turned on by the switch driving chip U1, the transformer T1 stores energy. At this time, the output voltage of the transformer T1 cannot break down the discharge gas. When the first switch circuit 100 and the second switch circuit 200 are turned off by the switch driving chip U1, the energy storage of the transformer T1 generates a very high induced voltage on the secondary winding, and the discharge gas is pulse-discharged. When the transformer T1 is discharged in the energy storage state, the voltage value of the induced voltage is relatively high, thereby improving the reliability and stability of the discharge of the discharge gas.

[0094] In some embodiments of the second aspect of the present invention, a gas discharge lamp includes a bipolar switch conversion circuit as in some embodiments of the first aspect of the present invention.

[0095] Compared with the discharge device with fixed polarity, the utility model shows polarity change in this longer period of the mains cycle, that is, the direction of discharge is reversed in a slightly longer period of time, which can reduce the generation of discharge medium migration, increase in electrode voltage drop, increase in equivalent internal resistance of electron emission materials and other problems, thereby reducing the occurrence of "balling phenomenon" and affecting the lighting effect of gas discharge lamps. When the first switch circuit and the second switch circuit are turned on, the transformer stores energy, and the voltage at the output end cannot break down the discharge gas. When the first switch circuit and the second switch circuit are turned off, the energy storage of the transformer generates a very high induced voltage on the secondary winding, and the discharge gas is pulse-discharged, making the pulse discharge more reliable.

[0096] The preferred implementation methods of the utility model are specifically described above, but the invention of the utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the utility model. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A bipolar switching conversion circuit, characterized in that: include: Gas discharge components; An AC power supply terminal, the AC power supply terminal is used to output an AC voltage; A transformer, wherein the transformer is provided with a primary winding and a secondary winding, the primary winding is connected to the AC power supply terminal, and the secondary winding is connected to the gas discharge component; A switch driving circuit, wherein the switch driving circuit is connected to the primary winding and the AC power supply end respectively; A first switch circuit, wherein the first switch circuit is connected to the primary winding and the switch drive circuit respectively, wherein a drive end of the first switch circuit is connected to a control end of the switch drive circuit; The second switch circuit is connected to the AC power supply end, the switch drive circuit and the first switch circuit respectively, wherein the drive end of the second switch circuit is connected to the control end of the switch drive circuit.

2. A bipolar switch conversion circuit according to claim 1, characterized in that: The primary winding comprises: A first primary coil, wherein the first primary coil is connected to an AC power supply terminal and a first switch circuit respectively; a second primary coil, one end of the second primary coil being connected to the switch driving circuit and the other end of the second primary coil being grounded; A third primary coil, one end of the third primary coil is connected to the other end of the second primary coil, and the other end of the third primary coil is connected to the switch drive circuit.

3. A bipolar switch conversion circuit according to claim 2, characterized in that: The first switch circuit comprises: a first rectifying and current limiting circuit, wherein the first rectifying and current limiting circuit is respectively connected to the second switch circuit and the switch driving circuit; a first switch tube, wherein the gate of the first switch tube is connected to the switch drive circuit through the first rectifier current limiting circuit, the drain of the first switch tube is connected to the first primary coil, and the source of the first switch tube is connected to the switch drive circuit; A first resistor, one end of which is connected to the source of the first switch tube, and the other end of which is grounded.

4. A bipolar switch conversion circuit according to claim 3, characterized in that: The second switch circuit comprises: a second rectifying and current limiting circuit, wherein the second rectifying and current limiting circuit is respectively connected to the first rectifying and current limiting circuit and the switch driving circuit; a second switch tube, wherein the gate of the second switch tube is connected to the switch drive circuit through the second rectifier current limiting circuit, the drain of the second switch tube is connected to the AC power supply end, and the source of the second switch tube is connected to the switch drive circuit; A second resistor, one end of the second resistor is connected to the source of the second switch tube, and the other end of the second resistor is grounded.

5. A bipolar switch conversion circuit according to claim 2, characterized in that: The switch driving circuit comprises: A switch driving chip, wherein a regulating end of the switch driving chip is respectively connected to a driving end of the first switch circuit and a driving end of the second switch circuit; a common cathode diode group, wherein an anode of the common cathode diode group is connected to the second primary coil and the third primary coil respectively, and a cathode of the common cathode diode group is connected to a power supply terminal of the switch driving chip; A voltage-stabilizing and voltage-dividing circuit is connected to the AC power supply end and the power supply end of the switch driving chip respectively.

6. A bipolar switch conversion circuit according to claim 3, characterized in that: The first rectifying and current limiting circuit comprises: a first diode, wherein an anode of the first diode is connected to a gate of the first switch tube, and a cathode of the first diode is connected to a second switch circuit and a switch driving circuit respectively; A third resistor is connected in parallel with the first diode.

7. A bipolar switch conversion circuit according to claim 4, characterized in that: The second rectifying and current limiting circuit comprises: a second diode, wherein an anode of the second diode is connected to a gate of the second switch tube, and a cathode of the second diode is connected to the first rectifying current limiting circuit and the switch driving circuit respectively; A fourth resistor is connected in parallel with the second diode.

8. A bipolar switch conversion circuit according to claim 5, characterized in that: The switch driving circuit further includes: a feedback resistor; One end of the feedback resistor is connected to the voltage-stabilizing voltage divider circuit and the cathode of the parallel diode group respectively, and the other end of the feedback resistor is connected to the feedback end of the switch driving chip.

9. A bipolar switch conversion circuit according to claim 5, characterized in that: The switch driver chip is a UC3843 switch driver chip.

10. A gas discharge lamp, characterized in that: It comprises a bipolar switch conversion circuit as claimed in any one of claims 1 to 9.

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