Ozone generator with frequency tracking function and ozone generator

Abstract

This invention relates to a circuit board for an ozone generator with frequency tracking functionality. The circuit board includes a frequency tracking circuit comprising an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit, and a frequency limiting protection unit. The LC resonant unit includes a resonant inductor T1 and a resonant capacitor C1, used to drive the ozone sensor. The current sampling unit includes a sampling resistor R8 connected in series in the LC resonant circuit, used to acquire the circuit current signal. The comparison control unit includes a comparator U1, a transistor Q1, a rectifier diode D2, and a filter capacitor C3. The voltage signal from the sampling resistor R8 is rectified by D2 and filtered by C3 before being input to the inverting input of U1. The voltage divider bias unit includes resistors R3 and R6. The RC oscillation unit is connected to the transistor Q1. This invention can adapt to capacitance changes during ozone sensor power-on and operation, automatically tracking the frequency and achieving resonance, while ensuring stable output power, extending device lifespan, and improving ozone generation efficiency and overall reliability.

Description

Technical Field

[0001] This invention relates to the field of ozone generator technology, and in particular to a circuit board for an ozone generator with frequency tracking function and an ozone generator. Background Technology

[0002] Ozone generators are the core equipment used to produce ozone. Due to ozone's strong oxidizing properties, they are widely used in various fields such as air purification, water treatment disinfection, and food processing sterilization. Among them, ceramic ozone sheet generators have become one of the mainstream products in current industry applications due to their advantages such as high ozone concentration, low energy consumption, and compact size.

[0003] Ozone generators are widely used in water treatment, air purification, disinfection, and sterilization. The ozone generator element is a capacitive load; its capacitance is large initially upon power-up, gradually decreasing and stabilizing after a period of operation with changes in temperature and operating conditions. Traditional drive circuits struggle to keep up with changes in the load's resonant point, easily leading to detuning, low efficiency, and severe overheating. Furthermore, input voltage fluctuations and load changes cause output power drift, affecting ozone generation efficiency and circuit reliability. Current technology lacks an integrated control scheme that simultaneously achieves automatic resonant tracking and constant power output; therefore, there is an urgent need for an ozone generator drive circuit capable of automatic frequency tracking and constant power output.

[0004] Therefore, it is desirable to provide a circuit board for an ozone generator with frequency tracking function and an ozone generator, which can solve the above-mentioned technical problems. Summary of the Invention

[0005] The first objective of this invention is to provide a circuit board for an ozone generator with frequency tracking function, which enables automatic resonant frequency tracking and improves efficiency and reliability.

[0006] A circuit board for an ozone generator with frequency tracking function, the circuit board is provided with a frequency tracking circuit, including an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit and a frequency limiting protection unit;

[0007] The LC resonant unit includes a resonant inductor T1 and a resonant capacitor C1, which are used to drive the ozone sheet to work.

[0008] The current sampling unit includes a sampling resistor R8, which is connected in series in the LC resonant circuit and is used to acquire the circuit current signal;

[0009] The comparison control unit includes a comparator U1, a transistor Q1, a rectifier diode D2, and a filter capacitor C3. The voltage signal of the sampling resistor R8 is rectified by D2 and filtered by C3 before being input to the inverting input terminal of U1.

[0010] The voltage divider bias unit includes resistors R3 and R6, which, after being connected in series to divide the voltage, provide a bias voltage to the positive input terminal of U1 with a set maximum resonant frequency.

[0011] The RC oscillation unit is connected to transistor Q1. The equivalent resistance of Q1 changes with the output voltage of U1, thereby adjusting the RC oscillation frequency.

[0012] When powered on, the voltage at the inverting input terminal of U1 is higher than that at the non-inverting input terminal, U1 outputs a low level, the equivalent resistance of Q1 is at its maximum, and the oscillation frequency starts to rise from its lowest value; when the LC resonant unit reaches the resonant point, the sampling voltage stabilizes, the output of U1 remains constant, and the oscillation frequency is locked at the resonant frequency.

[0013] Furthermore, the frequency limiting protection unit is composed of a resistor R2 and a diode D1 connected in series, and is connected between the collector of Q1 and the positive input terminal of U1 to limit the frequency tracking frequency from exceeding the set maximum value.

[0014] Furthermore, the circuit board is also provided with a constant power circuit, which includes a push-pull switch unit, a voltage sampling unit, a current sampling unit, an error amplification unit, and a PWM control unit;

[0015] The push-pull switch unit includes field-effect transistors B-Q1 and B-Q2, which are alternately turned on to drive the resonant transformer T1 to output high-frequency high voltage.

[0016] The current sampling unit includes a source resistor B-R3 and a filter capacitor B-C1, which collects the primary circuit current and converts it into a voltage signal.

[0017] The voltage sampling unit is composed of resistors B-R1, B-R2 and B-R3 connected in series, and collects a voltage signal that is proportional to the input voltage VCC.

[0018] The voltage sampling signal and the current sampling signal are superimposed and input to the inverting input terminal of the error amplifier B-U2. The non-inverting input terminal of B-U2 is connected to the reference voltage Vref with the set power.

[0019] The PWM control unit includes PWM controller B-U1A and PWM controller B-U1C. The output terminal of error amplifier B-U2 is connected to PWM controller B-U1A and B-U1C respectively. PWM controller B-U1A and B-U1C adjust the duty cycle of the field-effect transistor B-Q1 and the drive signal of field-effect transistor B-Q1 according to the output voltage of U2 to achieve constant output power when the input voltage fluctuates and the load changes.

[0020] Furthermore, when the input voltage VCC increases, the voltage at the inverting input terminal of B-U2 increases, the output of B-U2 decreases, the duty cycle of the PWM control unit decreases, and the current and power are limited to increase.

[0021] When the input voltage VCC decreases, the duty cycle of the PWM control unit increases to maintain a constant output power.

[0022] Furthermore, the frequency tracking circuit provides the clock frequency for the PWM control unit, and the constant power control circuit adjusts the drive duty cycle.

[0023] The second objective of this invention is to provide an ozone generator, including the circuit board for an ozone generator with frequency tracking function described above.

[0024] Specifically, an ozone generator also includes a high-voltage transformer, a mounting housing, and a ceramic ozone sheet;

[0025] The power input terminal of the circuit board is provided with a cable inlet slot for connecting external wires;

[0026] The high-voltage transformer is electrically connected to the circuit board and is used to convert low-voltage current into high-voltage electricity.

[0027] The lower surface of the mounting shell is provided with a first slot and a second slot, and conductive spring pieces are snapped into the first slot and the second slot respectively.

[0028] The mounting shell is provided with a first connecting hole and a second connecting hole on the same side, the first connecting hole is connected to the first slot, and the second connecting hole is connected to the second slot.

[0029] The ceramic ozone sheet is attached to the lower surface of the mounting housing, and the tops of the two conductive springs are respectively in contact with the two electrodes on the ceramic ozone sheet.

[0030] The high-voltage transformer is electrically connected to a high-voltage wire, and the other end of the high-voltage wire passes through the first connection hole and is snapped into the conductive spring in the first slot.

[0031] A ground wire is connected to the circuit board, and the other end of the ground wire passes through the second connection hole and is snapped into the conductive spring in the second slot.

[0032] The bottom center of the conductive spring extends upward to form a limiting groove, and the ends of the high voltage line and the ground line are engaged in the limiting groove of the corresponding conductive spring.

[0033] The conductive spring is provided with an elastic locking block, and the two conductive springs are locked into the first slot and the second slot by their own elastic locking blocks.

[0034] The conductive elastic strip has a conductive elastic bar at the top center position, and the top of the conductive elastic bar has conductive protrusions.

[0035] Furthermore, the inlet slot is provided with a limiting groove.

[0036] Furthermore, the mounting housing has connecting parts at both ends of its bottom, which can be used to fix the mounting housing to an external device.

[0037] Furthermore, the conductive spring is symmetrically bent around the same side of its central plane, and the cross-section of the first slot and the second slot are bent slots adapted to the conductive spring.

[0038] The circuit board for an ozone generator with frequency tracking function and the ozone generator of the present invention have the following advantages compared with the prior art:

[0039] (1) Automatic frequency tracking: Real-time sampling of resonant circuit current, dynamic adjustment of oscillation frequency, always locking the load resonant point, avoiding detuning, and improving conversion efficiency;

[0040] (2) Constant power output: Simultaneously sample the input voltage and output current, adaptively adjust the PWM duty cycle, and keep the power constant when the voltage fluctuates and the load changes;

[0041] (3) High reliability: Frequency limiting protection is set to prevent frequency from exceeding the limit; the resonant working state reduces the stress on the device and extends its service life;

[0042] (4) Strong adaptability: It is compatible with the capacitance changes of ozone pads during power-on and steady-state operation, and no manual adjustment is required;

[0043] (5) The bottom middle position of the conductive spring extends upward to form a limiting groove. The ends of the high voltage line and the ground line are respectively clamped in the limiting groove of the corresponding conductive spring to achieve the initial positioning and fixing of the wires. An elastic block is integrally formed on the conductive spring. The two conductive springs are firmly clamped in the first slot and the second slot through their own elastic blocks to prevent the conductive springs from displacing and falling off.

[0044] (6) A conductive elastic strip is provided at the top center of the conductive spring sheet. The top of the conductive elastic strip is processed with conductive protrusions. Under the action of elasticity, the conductive protrusions tightly abut against the electrode of the ceramic ozone sheet to ensure effective and stable conduction between the electrode and the conductive spring sheet, and avoid excessive contact resistance affecting the operation of the equipment. Attached Figure Description

[0045] Figure 1 This is a circuit diagram of the frequency tracking circuit in Example 1;

[0046] Figure 2 The circuit diagram of the constant power circuit in Example 2 is shown below.

[0047] Figure 3 This is a cross-sectional schematic diagram of an ozone generator according to Embodiment 3. Figure 1 ;

[0048] Figure 4 for Figure 3 A magnified view of a portion of the center line slot;

[0049] Figure 5 This is a schematic cross-sectional view of an ozone generator according to Example 3. Figure 1 ;

[0050] Figure 6 This is a schematic diagram of the conductive spring sheet in Example 3 mounted on the mounting shell;

[0051] Figure 7 This is a schematic diagram of the conductive spring sheet in Example 3;

[0052] Figure 8 This is a schematic diagram of the mounting shell in Example 3. Detailed Implementation

[0053] The specific embodiments of this invention will be further described in detail below with reference to the accompanying drawings.

[0054] Example 1

[0055] like Figure 1 As shown, a circuit board for an ozone generator with frequency tracking function is provided on the circuit board. The frequency tracking circuit includes an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit, and a frequency limiting protection unit.

[0056] The LC resonant unit includes a resonant transformer T1 and a resonant capacitor C1. The secondary winding of T1 drives a capacitive ozone sheet.

[0057] The current sampling unit includes a sampling resistor R8, a rectifier diode D2, and a filter capacitor C3. R8 is connected in series in an LC resonant circuit to collect the current signal. After rectification by D2 and filtering by C3, the signal is input to the inverting input of comparator U1.

[0058] The voltage divider bias unit includes resistors R3 and R6, which are connected in series to divide the voltage and then connected to the positive input terminal of U1. The maximum resonant frequency point is set, and the voltage value corresponds to the voltage drop of R8 at resonance.

[0059] The RC oscillation unit consists of a resistor, a capacitor, and a transistor Q1. The equivalent resistance of Q1 changes with the output voltage of U1, thus changing the RC oscillation frequency.

[0060] The frequency limiting protection unit includes a resistor R2 and a diode D1, which are connected in series between the collector of Q1 and the positive input terminal of U1 to prevent the frequency from exceeding the maximum frequency range.

[0061] Work process:

[0062] When powered on, C2, R5, and R7 make the voltage at the inverting input terminal of U1 higher than that at the non-inverting input terminal, U1 outputs a low level, Q1 has the maximum equivalent resistance, and the RC oscillator starts at the lowest frequency.

[0063] As the LC circuit operates, the voltage sampled by R8 is rectified and filtered, causing the voltage at the inverting input of U1 to decrease, the output of U1 to increase, the equivalent resistance of Q1 to decrease, and the oscillation frequency to rise.

[0064] When the frequency reaches the LC resonant point, the loop current is at its maximum, the voltage drop of R8 is stable, the output of U1 remains unchanged, and the oscillation frequency is locked at the resonant frequency, thus achieving automatic frequency tracking.

[0065] The ceramic ozone sheet in the ozone generator is a capacitive load. Its capacitance is large when first powered on, gradually decreasing after a period of operation until it reaches a certain value and remains constant. Therefore, frequency tracking is needed to maintain the circuit in a resonant state. This circuit is used to keep T1 and C1 operating in a resonant state.

[0066] When T1 / C1 is operating in resonant mode, the effective value of the current in its circuit is at its maximum. The greater the deviation of the operating frequency from its resonant frequency, the smaller the effective value of the current in the circuit. The sampled current value in the LC circuit of R8 series is rectified and filtered by D2 and C3 to obtain the effective value of the current of the LC echo.

[0067] The series voltage divider R3 / R6 provides a bias voltage to the positive input terminal of U1. This voltage is used to set the maximum operating frequency of the LC, and its value is basically equal to the voltage drop across R8 when the LC resonates.

[0068] The circuit consisting of C2 / R5 / R7 ensures that when powered on, the voltage at the inverting input terminal of U1 is higher than that at its non-inverting input terminal, and the output terminal of U1 is 0V. As a result, the collector and emitter of transistor Q1 are open, the equivalent resistance is at its maximum, and the RC oscillator starts working from the lowest frequency.

[0069] As the voltage at the inverting input of U1 decreases, it gradually approaches the voltage at its non-inverting input. The output voltage of U1 also gradually increases, and the equivalent resistance between the collector and emitter of Q1 decreases synchronously, causing the frequency of the RC oscillator to rise. When the frequency reaches the current resonant point, the voltage drop across R8 prevents the voltage at the inverting input of U1 from decreasing further, and the output voltage of U1 remains constant, thus keeping the RC oscillation frequency constant.

[0070] R2 and D1 are connected in series and then connected between the collector of Q1 and the positive input terminal of U1 to prevent the frequency of frequency tracking from exceeding the set maximum frequency range.

[0071] Example 2

[0072] like Figure 2As shown, a circuit board for an ozone generator with frequency tracking function is provided on the circuit board. The circuit board is also provided with a constant power circuit, which includes a push-pull switch unit, a voltage sampling unit, a current sampling unit, an error amplification unit, and a PWM control unit.

[0073] The push-pull switch unit includes field-effect transistors B-Q1 and B-Q2, which alternately conduct to drive the resonant transformer T1 to output high-frequency high voltage.

[0074] The current sampling unit includes a source resistor B-R3 and a filter capacitor B-C1. B-R3 collects the primary circuit current and converts it into a voltage signal, which is then filtered by B-C1.

[0075] The voltage sampling unit includes resistors B-R1, B-R2, and B-R3, which are connected in series between VCC and ground. A voltage signal proportional to VCC is obtained by sampling between B-R1 and B-R2.

[0076] The voltage sampling signal and the current sampling signal are superimposed and input to the inverting input of error amplifier B-U2; the non-inverting input of B-U2 is connected to the reference voltage Vref, which is used to set the output power.

[0077] The output of U2 is connected to the PWM control unit. The PWM clock is provided by the RC oscillator. The output voltage of B-U2 adjusts the duty cycle of the PWM control unit.

[0078] Work process:

[0079] When the load current increases, the voltage of B-R3 rises, the voltage at the inverting input of B-U2 increases, the output of B-U2 decreases, the duty cycle of the PWM control unit decreases, and the current limit increases.

[0080] When the input voltage VCC increases, the voltage sampling signal increases, the voltage at the inverting input terminal of B-U2 increases, the output of B-U2 decreases, the duty cycle of the PWM control unit decreases, and the power increase is suppressed.

[0081] When the input voltage decreases or the load current decreases, the output of B-U2 increases, the duty cycle of the PWM control unit increases, and the output power remains constant.

[0082] This circuit maintains constant power operation for the push-pull switching circuit.

[0083] B-Q1 and B-Q2 are field-effect transistors. When they are working, the two transistors conduct alternately, driving T1 to output a high-frequency, high-voltage drive voltage.

[0084] B-R3 is connected between the source of B-Q1 / B-Q2 and ground. The current through the primary winding of T1 generates a voltage signal on B-R3 that is proportional to the current. After being filtered by B-C1, the effective value of the current is obtained.

[0085] B-R1 / B-R2 / B-R3 are connected in series between VCC and GND. A voltage signal proportional to VCC is sampled between B-R1 and B-R2. This voltage signal is superimposed on the current signal sampled on B-R3 and sent to the inverting input of B-U2.

[0086] B-U2 is an error amplifier, whose positive input is a voltage source, which remains constant during operation. This voltage is used to set the output power of the circuit.

[0087] The output of B-U2 is connected to the PWM controller, and its output voltage level controls the duty cycle of the signals driving the MOSFETs B-Q1 and B-Q2. CLK is derived from the RC oscillator and provides the drive frequency for the PWM controller.

[0088] When the current flowing through B-R3 increases, the voltage at the inverting input of B-U2 increases, and the output voltage of B-U2 decreases, causing the duty cycle of the PWM output to decrease, thereby limiting the increase of the output current. Conversely, it increases the duty cycle of the PWM output.

[0089] When the input voltage (VCC) rises, the voltage at the inverting input of B-U2 also increases, causing the output voltage of B-U2 to decrease. This reduces the duty cycle of the PWM output, lowering the lower limit of the current flowing through MOSFETs B-Q1 and B-Q2, thus limiting the power increase with voltage rise. When the input voltage decreases, the current in MOSFETs B-Q1 and B-Q2 increases, ensuring that the output power remains constant.

[0090] Example 3

[0091] like Figure 3 and Figure 4 As shown, an ozone generator includes a circuit board 1, a high-voltage transformer 2, a mounting housing 3, and a ceramic ozone sheet 4. The circuit board is the same as that in Embodiments 1 and 2.

[0092] like Figure 4 As shown, the power input terminal of the circuit board 1 is provided with an inlet slot 5 for connecting external wires. In this embodiment, in order to facilitate the positioning of external wires, the inlet slot 5 is provided with a limiting groove 6, which plays a role in limiting and guiding the external wire plug, so that it can be accurately inserted into the inlet slot 5 and electrically connected to the circuit board 1.

[0093] The high-voltage transformer 2 is electrically connected to the circuit board 1 and is used to convert low-voltage current into high-voltage current.

[0094] like Figure 6 and Figure 8As shown, the lower surface of the mounting shell 3 is provided with a first slot 7 and a second slot 8, and conductive spring pieces 9 are snapped into the first slot 7 and the second slot 8 respectively; a first connecting hole 10 and a second connecting hole 11 are provided on the same side of the mounting shell 3, the first connecting hole 10 is connected to the first slot 7, and the second connecting hole 11 is connected to the second slot 8.

[0095] like Figure 5 As shown, the ceramic ozone sheet 4 is attached to the lower surface of the mounting shell 3, and the tops of the two conductive springs 9 are in contact with the two electrodes on the ceramic ozone sheet 4, respectively.

[0096] The high voltage transformer 2 is electrically connected to a high voltage line 12. The other end of the high voltage line 12 passes through the first connection hole 10 and is snapped into a conductive spring in the first slot 7.

[0097] A ground wire 13 is connected to the circuit board 1. The other end of the ground wire 13 passes through the second connection hole 11 and is snapped into the conductive spring in the second slot 8.

[0098] In the ozone generator described above, high voltage is applied to the two electrodes of the ceramic ozone sheet 4 during operation. A gap exists between the electrodes. When air or oxygen passes through this gap, the ceramic ozone sheet generates a blue glow discharge. The free, high-energy ions in the corona dissociate O2 molecules and recombine into O3 molecules. Because both the high-voltage wire 12 and the ground wire 13 are connected to the mounting housing 3 via snap-fit ​​connections, they are not easily detached, ensuring a secure electrical connection.

[0099] In this embodiment, as Figure 7 As shown, the bottom center of the conductive spring 9 extends upward to form a limiting groove 14, and the ends of the high voltage line 12 and the ground line 13 are engaged in the limiting groove 14 of the corresponding conductive spring 9; the conductive spring 9 is provided with an elastic locking block 15, and the two conductive springs 9 are engaged in the first locking groove 7 and the second locking groove 8 by their own elastic locking blocks 15; the top center of the conductive spring 9 has a conductive elastic strip 16, and the top of the conductive elastic strip 16 has a conductive protrusion 17, which facilitates a more stable and effective contact with the corresponding electrode on the ceramic ozone sheet 4.

[0100] Furthermore, such as Figure 7As shown, the conductive spring 9 is symmetrically bent around the same side of its central plane. The cross-section of the first slot 7 and the second slot 8 are curved slots adapted to the conductive spring. With this configuration, when the high-voltage line 12 or the ground line 13 is subjected to external pulling force, the conductive spring 9 undergoes slight deformation with the pulling force. After deformation, the lateral width of the conductive spring increases, further securing it in the corresponding slot. At the same time, the width of the limiting groove 14 decreases due to compression, firmly securing the high-voltage line 12 or the ground line 13. This dual structure prevents the wire from falling off and ensures the long-term stability of the electrical connection.

[0101] In this embodiment, the bottom of both ends of the mounting shell 3 is provided with connecting parts 18, and the mounting shell 3 can be fixed to an external device through the connecting parts 18.

[0102] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A circuit board for an ozone generator with frequency tracking function, characterized in that, The circuit board is equipped with a frequency tracking circuit, including an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit, and a frequency limiting protection unit; The LC resonant unit includes a resonant inductor T1 and a resonant capacitor C1, which are used to drive the ozone sheet to work. The current sampling unit includes a sampling resistor R8, which is connected in series in the LC resonant circuit and is used to acquire the circuit current signal; The comparison control unit includes a comparator U1, a transistor Q1, a rectifier diode D2, and a filter capacitor C3. The voltage signal of the sampling resistor R8 is rectified by D2 and filtered by C3 before being input to the inverting input terminal of U1. The voltage divider bias unit includes resistors R3 and R6, which, after being connected in series to divide the voltage, provide a bias voltage to the positive input terminal of U1 with a set maximum resonant frequency. The RC oscillation unit is connected to transistor Q1. The equivalent resistance of Q1 changes with the output voltage of U1, thereby adjusting the RC oscillation frequency. When powered on, the voltage at the inverting input terminal of U1 is higher than that at the non-inverting input terminal, U1 outputs a low level, the equivalent resistance of Q1 is at its maximum, and the oscillation frequency starts to rise from its lowest value; when the LC resonant unit reaches the resonant point, the sampling voltage stabilizes, the output of U1 remains constant, and the oscillation frequency is locked at the resonant frequency.

2. The circuit board for an ozone generator with frequency tracking function according to claim 1, characterized in that, The frequency limiting protection unit consists of a resistor R2 and a diode D1 connected in series, and is connected between the collector of Q1 and the positive input terminal of U1 to limit the frequency tracking frequency from exceeding the set maximum value.

3. A circuit board for an ozone generator with frequency tracking function according to claim 1 or 2, characterized in that, The circuit board is also equipped with a constant power circuit, which includes a push-pull switch unit, a voltage sampling unit, a current sampling unit, an error amplification unit, and a PWM control unit. The push-pull switch unit includes field-effect transistors B-Q1 and B-Q2, which are alternately turned on to drive the resonant transformer T1 to output high-frequency high voltage. The current sampling unit includes a source resistor B-R3 and a filter capacitor B-C1, which collects the primary circuit current and converts it into a voltage signal. The voltage sampling unit is composed of resistors B-R1, B-R2 and B-R3 connected in series, and collects a voltage signal that is proportional to the input voltage VCC. The voltage sampling signal and the current sampling signal are superimposed and input to the inverting input terminal of the error amplifier B-U2. The non-inverting input terminal of B-U2 is connected to the reference voltage Vref with the set power. The PWM control unit includes PWM controller B-U1A and PWM controller B-U1C. The output terminal of error amplifier B-U2 is connected to PWM controller B-U1A and B-U1C respectively. PWM controller B-U1A and B-U1C adjust the duty cycle of the field-effect transistor B-Q1 and the drive signal of field-effect transistor B-Q1 according to the output voltage of U2 to achieve constant output power when the input voltage fluctuates and the load changes.

4. A circuit board for an ozone generator with frequency tracking function according to claim 3, characterized in that, When the input voltage VCC increases, the voltage at the inverting input terminal of B-U2 increases, the output of B-U2 decreases, the duty cycle of the PWM control unit decreases, and the current and power are limited to increase. When the input voltage VCC decreases, the duty cycle of the PWM control unit increases to maintain a constant output power.

5. A circuit board for an ozone generator with frequency tracking function according to claim 4, characterized in that, The frequency tracking circuit provides the clock frequency for the PWM control unit, and the constant power control circuit adjusts the drive duty cycle.

6. An ozone generator, characterized in that, The circuit board for an ozone generator with frequency tracking function, as described in any one of claims 1 to 5.

7. An ozone generator according to claim 6, characterized in that, It also includes a high-voltage transformer, mounting housing, and ceramic ozone pads; The power input terminal of the circuit board is provided with a cable inlet slot for connecting external wires; The high-voltage transformer is electrically connected to the circuit board and is used to convert low-voltage current into high-voltage electricity. The lower surface of the mounting shell is provided with a first slot and a second slot, and conductive spring pieces are snapped into the first slot and the second slot respectively. The mounting shell is provided with a first connecting hole and a second connecting hole on the same side, the first connecting hole is connected to the first slot, and the second connecting hole is connected to the second slot. The ceramic ozone sheet is attached to the lower surface of the mounting housing, and the tops of the two conductive springs are respectively in contact with the two electrodes on the ceramic ozone sheet. The high-voltage transformer is electrically connected to a high-voltage wire, and the other end of the high-voltage wire passes through the first connection hole and is snapped into the conductive spring in the first slot. A ground wire is connected to the circuit board, and the other end of the ground wire passes through the second connection hole and is snapped into the conductive spring in the second slot. The bottom center of the conductive spring extends upward to form a limiting groove, and the ends of the high voltage line and the ground line are engaged in the limiting groove of the corresponding conductive spring. The conductive spring is provided with an elastic locking block, and the two conductive springs are locked into the first slot and the second slot by their own elastic locking blocks. The conductive elastic strip has a conductive elastic bar at the top center position, and the top of the conductive elastic bar has conductive protrusions.

8. An ozone generator according to claim 7, characterized in that, The incoming line slot is provided with a limiting groove.

9. An ozone generator according to claim 8, characterized in that, The mounting housing has connecting parts at both ends of its bottom, which can be used to fix the mounting housing to an external device.

10. An ozone generator according to any one of claims 6 to 9, characterized in that, The conductive spring is symmetrically bent around the same side of its central plane, and the cross-section of the first slot and the second slot are bent slots adapted to the conductive spring.

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