Purification device discharge control circuit and purification device

Abstract

This invention discloses a discharge control circuit and a purification device. The purification device includes at least one discharge electrode. The discharge control circuit includes: a power supply module for outputting a supply voltage based on a power-on control signal; a drive module, comprising at least a composite frequency drive unit and a drive output unit; the composite frequency drive unit outputting a first drive signal with a first frequency and a second drive signal with a second frequency, wherein the first frequency is greater than or equal to 10 times the second frequency; the drive output unit controlling a main switch unit to turn on or off according to the first and second drive signals; and a boost module for boosting the supply voltage based on the on state of the main switch unit to adjust the discharge voltage output by the discharge electrode. This invention adjusts the discharge voltage based on a composite frequency, changing the high-voltage electric field strength and improving the ion concentration adjustment performance, which is beneficial for improving air purification effects.

Description

Technical Field

[0001] This invention relates to the field of discharge control technology, and in particular to a discharge control circuit for a purification device and the purification device itself. Background Technology

[0002] An ionized air purifier is a device that uses a high-voltage current at a specific frequency to generate a high-voltage electric field. Ozone is produced by an electrochemical reaction of oxygen molecules around the electric field, thus purifying the air.

[0003] In related technologies, plasma air purifiers typically use discharge voltages of specific frequency and amplitude to excite high-voltage electric fields. However, these technologies suffer from several problems. The purifiers cannot adjust the ion concentration around them according to environmental requirements, resulting in high power consumption and excessively high ozone concentrations, which negatively impacts the air purification effect. Summary of the Invention

[0004] This invention provides a discharge control circuit and purification device for a purification device, in order to solve the problem that existing purifiers cannot adjust the ion concentration around the purifier according to environmental needs, resulting in high power consumption and excessive ozone concentration, thereby improving the ion concentration regulation performance.

[0005] In a first aspect, embodiments of the present invention provide a discharge control circuit for a purification device. The purification device includes at least one discharge electrode. The discharge control circuit includes: a power supply module for outputting a power supply voltage based on a power-on control signal; a drive module, which includes at least a composite frequency drive unit and a drive output unit; the composite frequency drive unit for outputting a first drive signal having a first frequency and a second drive signal having a second frequency, wherein the first frequency is greater than or equal to 10 times the second frequency; the drive output unit for controlling a main switch unit to be turned on or off according to the first drive signal and the second drive signal; and a boost module for boosting the power supply voltage based on the on state of the main switch unit to adjust the discharge voltage output by the discharge electrode.

[0006] Secondly, embodiments of the present invention provide a purification device, comprising: at least one discharge electrode and the aforementioned discharge control circuit, wherein the discharge control circuit is used to control the discharge electrode to output a discharge voltage and to regulate the discharge voltage; wherein the discharge electrode comprises: a positive ion discharge electrode and / or a negative ion discharge electrode.

[0007] The technical solution of this invention, by setting a composite frequency driving unit, outputs a first driving signal with a first frequency and a second driving signal with a second frequency, and controls the main switch unit to be turned on or off according to the first and second driving signals. The discharge control circuit boosts the supply voltage based on the on state of the main switch unit to adjust the discharge voltage output by the discharge electrode. This solves the problem that existing air purifiers cannot adjust the ion concentration around the purifier according to environmental needs, resulting in high power consumption and easy generation of excessive ozone concentration. By outputting a discharge voltage based on a composite frequency and adjusting the high voltage electric field strength, the ion concentration adjustment performance is improved, and ozone concentration exceeding the standard due to continuous discharge is avoided, which is beneficial to improving the air purification effect.

[0008] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of a discharge control circuit provided in an embodiment of the present invention;

[0011] Figure 2 A circuit schematic diagram of the first discharge control circuit provided in an embodiment of the present invention;

[0012] Figure 3 A circuit diagram of the second discharge control circuit provided in an embodiment of the present invention;

[0013] Figure 4 A circuit diagram of the third discharge control circuit provided in the embodiments of the present invention;

[0014] Figure 5 The circuit diagram of the fourth discharge control circuit provided in the embodiment of the present invention. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0016] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0017] The present invention provides a discharge control circuit for a purification device, the purification device including at least one discharge electrode.

[0018] Figure 1 This is a schematic diagram of a discharge control circuit provided in an embodiment of the present invention.

[0019] See Figure 1 As shown, the discharge control circuit includes: a power supply module 100, a drive module 200, and a boost module 300.

[0020] The power supply module 100 is used to output a supply voltage based on a power-on control signal (e.g., an ON / OFF signal). The power supply module 100 is connected to an external power supply interface VIN. When the power-on control signal is ON (i.e., a high-level signal), the power supply module 100 outputs the supply voltage; when the power-on control signal is OFF (i.e., a low-level signal), the power supply module 100 stops outputting the supply voltage. In this application, the external power supply interface VIN is used to provide a low-voltage DC voltage (e.g., a 12V DC voltage); the power supply module 100 performs voltage regulation on the external power supply interface VIN and outputs a supply voltage with one or more voltage amplitudes. The voltage amplitude of the supply voltage can be configured based on the operating voltage level of the components in the discharge control circuit, and is not limited thereto.

[0021] The drive module 200 includes at least a composite frequency drive unit 210 and a drive output unit 220. The composite frequency drive unit 210 outputs a first drive signal P1 with a first frequency and a second drive signal P2 with a second frequency, wherein the first frequency is greater than or equal to 10 times the second frequency. The drive output unit 220 controls the main switch unit Q (e.g., using an NPN MOSFET) to turn on or off according to the first drive signal P1 and the second drive signal P2. See also... Figure 1 As shown, the composite frequency driving unit 210 includes a first oscillation circuit 211 and a second oscillation circuit 212. The first oscillation circuit 211 and the second oscillation circuit 212 are oscillation circuits based on operational amplifiers, and the oscillation frequency is determined by the resistance and capacitance values ​​in the oscillation circuits. In this application, the oscillation frequency range of the first oscillation circuit 211 is 1kHz to 10kHz, that is, the oscillation frequency range of the first driving signal P1 is 1kHz to 10kHz; the oscillation frequency range of the second oscillation circuit 212 is 10Hz to 100Hz, that is, the oscillation frequency range of the second driving signal P2 is 10Hz to 100Hz. Typically, the oscillation frequency of the first driving signal P1 can be set to 10kHz, and the oscillation frequency of the second driving signal P2 can be set to 50Hz.

[0022] See Figure 1 As shown, the boost module 300 is used to boost the supply voltage based on the conduction state of the main switch unit Q, so as to adjust the discharge voltage output by the discharge electrode TP. In this application, the discharge electrode TP includes a positive ion discharge electrode TP and / or a negative ion discharge electrode TP. In plasma purification technology, the discharge electric fields of the positive ion discharge electrode TP and the negative ion discharge electrode TP are balanced.

[0023] See Figure 1 As shown, the power supply module 100, the first oscillation circuit 211, the second oscillation circuit 212, the drive output unit 220, and the boost module 300 share a common ground terminal GND.

[0024] In this application, the grounding terminal GND, the external power supply interface VIN, and the ON / OFF signal interface can be integrated into the same terminal block to realize the plug-in connection between the discharge control circuit and the host computer system.

[0025] Specifically, when the power-on control signal is ON (i.e., a high-level signal), the power module 100 outputs the supply voltage. The first oscillation circuit 211 and the second oscillation circuit 212 output oscillation signals (i.e., the first drive signal P1 and the second drive signal P2). The drive output unit 220 controls the main switch unit Q to be turned on or off according to the first drive signal P1 and the second drive signal P2. When the main switch unit Q is turned on, the boost circuit of the boost module 300 is turned on, and a high-voltage electric field is generated around the discharge electrode TP. When the main switch unit Q is turned off, the boost circuit of the boost module 300 is turned off, and the discharge electrode TP stops outputting the discharge voltage. By setting a composite frequency drive unit, the discharge electrode operates in an intermittent discharge state, which solves the problem that existing air purifiers cannot adjust the ion concentration around the purifier according to environmental needs, resulting in high power consumption and easy generation of excessive ozone concentration. Based on the composite frequency output discharge voltage, the high-voltage electric field strength is changed, the ion concentration regulation performance is improved, and the ozone concentration exceeding the standard due to continuous discharge is avoided, which is conducive to improving the air purification effect.

[0026] Figure 2 The circuit diagram of a discharge control circuit provided in an embodiment of the present invention exemplifies the circuit structure of a discharge drive module.

[0027] See Figure 2 As shown, the first oscillation circuit 211 of this application includes: a first amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first capacitor C1. The first amplifier U1 has a non-inverting input terminal (+), an inverting input terminal (-), and an output terminal. The output terminal is connected to the non-inverting input terminal (+) of the drive output unit 220. The first end of the first resistor R1 is connected to the power supply module 100, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded, and a first node is provided between the first resistor R1 and the second resistor R2. The first node is connected to the non-inverting input terminal (+) of the first amplifier U1. The first end of the third resistor R3 is connected to the non-inverting input terminal (+) of the first amplifier U1, and the second end of the third resistor R3 is connected to the output terminal of the first amplifier U1. The first end of the fourth resistor R4 is connected to the power supply module 100, and the second end of the fourth resistor R4 is connected to the output terminal of the first amplifier U1. The fourth resistor R4 is the output pull-up resistor of the first amplifier U1. The first end of the fifth resistor R5 is connected to the inverting input terminal (-) of the first amplifier U1, and the second end of the fifth resistor R5 is connected to the output terminal of the first amplifier U1. The first end of the first capacitor C1 is connected to the inverting input terminal (-) of the first amplifier U1, and the second end of the first capacitor C1 is grounded.

[0028] Specifically, the first resistor R1 and the second resistor R2 form a voltage divider circuit, transmitting the first divided voltage to the non-inverting input terminal + of the first amplifier U1. At the initial power-on moment of the power module 100, the voltage at the non-inverting input terminal + of the first amplifier U1 is equal to the first divided voltage; the voltage at the inverting input terminal - of the first amplifier U1 is zero, and the first drive signal P1 output by the first amplifier U1 is a high-level signal. The first capacitor C1 continues to charge. When the voltage across the first capacitor C1 equals the first divided voltage, the first drive signal P1 output by the first amplifier U1 is a low-level signal. The oscillation frequency of the first drive signal P1 is determined by the capacitance value of the first capacitor C1.

[0029] See Figure 2 As shown, the second oscillation circuit 212 of this application includes: a second amplifier U2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a reverse protection diode D1, a ninth resistor R9, a tenth resistor R10, a second capacitor C2, and a multi-resistor parallel unit. For example, the multi-resistor parallel unit includes an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13 connected in parallel. The second amplifier U2 has a non-inverting input terminal +, an inverting input terminal -, and an output terminal. The output terminal of the second amplifier U2 is connected to the inverting input terminal - of the drive output unit 220. The first end of the sixth resistor R6 is connected to the power supply module 100, the second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is grounded, and a second node is provided between the sixth resistor R6 and the seventh resistor R7. The second node is connected to the second... The non-inverting input terminal of amplifier U2 is connected to the positive terminal; the first terminal of the eighth resistor R8 is connected to the second node, the second terminal of the eighth resistor R8 is connected to the positive terminal of the anti-reverse diode D1, and the negative terminal of the anti-reverse diode D1 is connected to the output terminal of the second amplifier U2; the first terminal of the ninth resistor R9 is connected to the power supply module 100, and the second terminal of the ninth resistor R9 is connected to the output terminal of the second amplifier U2, wherein the ninth resistor R9 is the output pull-up resistor of the second amplifier U2; the first terminal of the tenth resistor R10 is connected to the inverting input terminal of the second amplifier U2, the second terminal of the tenth resistor R10 is connected to the first terminal of the multi-resistor parallel unit, and the second terminal of the multi-resistor parallel unit is connected to the output terminal of the second amplifier U2; the first terminal of the second capacitor C2 is connected to the inverting input terminal of the second amplifier U2, and the second terminal of the second capacitor C2 is grounded.

[0030] Specifically, the sixth resistor R6 and the seventh resistor R7 form a voltage divider circuit, transmitting the second divided voltage to the non-inverting input terminal + of the second amplifier U2. At the initial power-on moment of the power module 100, the voltage at the non-inverting input terminal + of the second amplifier U2 is equal to the second divided voltage; the voltage at the inverting input terminal - of the second amplifier U2 is zero, and the second drive signal P2 output by the second amplifier U2 is a high-level signal. The second capacitor C2 continues to charge. When the voltage across the second capacitor C2 equals the second divided voltage, the second drive signal P2 output by the second amplifier U2 is a low-level signal. The oscillation frequency of the first drive signal P1 is determined by the capacitance value of the second capacitor C2.

[0031] See Figure 2 As shown, the drive output unit 220 includes: a pull-up resistor R301, a first pull-down resistor R302, a third amplifier U3, a main switch unit Q, and a third capacitor C3; the non-inverting input terminal + of the third amplifier U3 is connected to the first oscillation circuit 211, the inverting input terminal - of the third amplifier U3 is connected to the second oscillation circuit 212, and the output terminal of the third amplifier U3 is connected to the control terminal of the main switch unit Q; the first end of the pull-up resistor R301 is connected to the power supply module 100, and the second end of the first pull-down resistor R302 is connected to the control terminal of the main switch unit Q; the first end of the first pull-down resistor R302 is connected to the control terminal of the main switch unit Q, and the second end of the first pull-down resistor R302 is grounded; the first end of the main switch unit Q is connected to the boost module 300, the second end of the main switch unit Q is grounded, and a third node is provided between the first end of the main switch unit Q and the boost module 300; the first end of the third capacitor C3 is connected to the third node, and the second end of the third capacitor C3 is grounded.

[0032] Specifically, when the voltage amplitude of the first driving signal P1 is higher than the voltage amplitude of the second driving signal P2, the main switch unit Q is turned on, the boost circuit of the boost module 300 is turned on, the discharge electrode TP outputs a discharge voltage, and a high-voltage electric field is generated around the discharge electrode TP; when the voltage amplitude of the first driving signal P1 is lower than the voltage amplitude of the second driving signal P2, the main switch unit Q is turned off, the boost circuit of the boost module 300 is turned off, and the discharge electrode TP stops outputting a discharge voltage.

[0033] It should be noted that the resistance values, capacitance values, and amplifier models of each component in the discharge drive module are configured based on actual working requirements, and there are no restrictions on them.

[0034] See Figure 3As shown, the discharge control circuit of this application further includes: a drive protection module 400, used to monitor the discharge voltage and output a drive protection signal based on the monitoring data; the drive protection module 400 includes: a first protection resistor R401, a second protection resistor R402, a third protection resistor R403, a fourth capacitor C4, a fifth capacitor C5, a fourth amplifier U4, and a drive protection switch Q4; the first terminal of the first protection resistor R401 is connected to the power supply module 100, the second terminal of the first protection resistor R401 is connected to the first terminal of the second protection resistor R402, and the second terminal of the second protection resistor R402 is connected to the first terminal of the second protection resistor R402. The control terminal of the drive protection switch Q4 is connected; the non-inverting input terminal + of the fourth amplifier U4 is connected to the reference voltage power supply terminal, the inverting input terminal - of the fourth amplifier U4 is connected to the discharge voltage feedback terminal, and the output terminal of the fourth amplifier U4 is grounded through the fourth capacitor C4; the first terminal of the fifth capacitor C5 is connected to the inverting input terminal - of the fourth amplifier U4, and the second terminal of the fifth capacitor C5 is connected to the output terminal of the fourth amplifier U4; the output terminal of the fourth amplifier U4 is connected to the composite frequency drive unit 210 through the third protection resistor R403, and the fourth amplifier U4 is used to set the second drive signal P2.

[0035] See Figure 3 As shown, the discharge control circuit of this application further includes: a reference voltage processing module 410, which includes resistors R404 and R405. The first end of resistor R404 is connected to the power supply voltage output terminal of the power module 100, and the second end of resistor R404 is connected to the first end of resistor R405. The second end of resistor R405 is grounded. The node between resistors R404 and R405 is set as a reference voltage power supply terminal, which is used to provide a reference voltage V. ref .

[0036] See Figure 3 As shown, the discharge control circuit of this application further includes: a discharge voltage sampling module 420, for example, a sampling resistor string, the first end of the sampling resistor string is connected to the discharge electrode, the second end of the sampling resistor string is grounded, and a discharge voltage feedback terminal is set between the sampling resistor strings. The discharge voltage feedback terminal is used to provide a feedback voltage Vo'.

[0037] Specifically, when the feedback voltage Vo' is higher than the reference voltage V ref When the fourth amplifier U4 outputs a low-level signal, it drives the protection switch Q4 to turn off. Simultaneously, the low-level signal output by the fourth amplifier U4 is transmitted to the non-inverting input terminal + of the second amplifier U2, setting the second drive signal P2 to a low level. This causes the main switch unit Q to turn on or off according to the output level of the third amplifier U3. When the feedback voltage Vo' is lower than the reference voltage V... refWhen the fourth amplifier U4 outputs a high-level signal, it drives the protection switch Q4 to conduct, pulling the control terminal level of the main switch unit Q low. Simultaneously, the high-level signal output by the fourth amplifier U4 is transmitted to the non-inverting input terminal + of the second amplifier U2, setting the second drive signal P2 to a high-level signal. The third amplifier U3 outputs a low-level signal, synchronously pulling the control terminal level of the main switch unit Q low, thus turning off the main switch unit Q. By setting the drive protection module 400, the discharge voltage is monitored in real time. When the discharge voltage is lower than a set value (e.g., V), the system will detect the discharge voltage and prevent further damage. ref When the voltage drops, the main switch unit Q is disconnected in time to achieve low voltage protection.

[0038] See Figure 4 As shown, the discharge control circuit of this application further includes: a discharge feedback module 500 and a feedback interaction interface CN. out The discharge feedback module 500 is used to monitor the discharge voltage and transmit the monitoring results to the feedback interaction interface CN. out Among them, the feedback interaction interface CN out It can be integrated with the grounding terminal GND, external power supply interface VIN, and ON / OFF signal interface on the same terminal block to achieve plug-in connection between the discharge control circuit and the host computer system, via the feedback interaction interface CN. out The monitoring results of the discharge voltage are transmitted to the host computer system.

[0039] See Figure 4 As shown, the discharge feedback module 500 includes: a fifth amplifier U5, a sixth capacitor C6, and a first current-limiting resistor R501; the non-inverting input terminal + of the fifth amplifier U5 is connected to the reference voltage power supply terminal, the inverting input terminal - of the fifth amplifier U5 is connected to the feedback terminal of the discharge voltage, and the output terminal of the fifth amplifier U5 is connected to the feedback interface via the first current-limiting resistor; the first terminal of the sixth capacitor C6 is connected to the power supply terminal, the first terminal of the sixth capacitor C6 is also connected to the output terminal of the fifth amplifier U5, and the second terminal of the sixth capacitor C6 is connected to the inverting input terminal - of the fifth amplifier U5.

[0040] See Figure 4 As shown, the discharge control circuit of this application further includes: a reference voltage processing module 410, which includes resistors R404 and R405. The first end of resistor R404 is connected to the power supply voltage output terminal of the power module 100, and the second end of resistor R404 is connected to the first end of resistor R405. The second end of resistor R405 is grounded. The node between resistors R404 and R405 is set as a reference voltage power supply terminal, which is used to provide a reference voltage V. ref .

[0041] See Figure 4As shown, the discharge control circuit of this application further includes: a discharge voltage sampling module 420, for example, a sampling resistor string, the first end of the sampling resistor string is connected to the discharge electrode, the second end of the sampling resistor string is grounded, and a discharge voltage feedback terminal is set between the sampling resistor strings. The discharge voltage feedback terminal is used to provide a feedback voltage Vo'.

[0042] See Figure 4 As shown, the discharge feedback module 500 further includes: a second pull-down resistor R502, a third pull-down resistor R503, a first discharge capacitor C502, and a second discharge capacitor C503; the first end of the second pull-down resistor R502 is connected to the output terminal of the fifth amplifier U5, and the second end of the second pull-down resistor R502 is grounded; the first discharge capacitor C502 is connected in parallel with the second pull-down resistor R502; the first end of the third pull-down resistor R503 is connected to the inverting input terminal of the fifth amplifier U5, and the second end of the third pull-down resistor R503 is grounded; the second discharge capacitor C503 is connected in parallel with the third pull-down resistor R503.

[0043] See Figure 4 As shown, the discharge feedback module 500 also includes an abnormality indication circuit 520, which is connected to the output terminal P of the fifth amplifier U5 and issues an indication signal according to the output level of the fifth amplifier U5. The discharge abnormality indication module 520 includes: a second current-limiting resistor R504, a third current-limiting resistor R505, an indication switch Q5, and an indication unit DL; the first end of the second current-limiting resistor R504 is connected to the power supply module 100, the second end of the second current-limiting resistor R504 is connected to the first end of the indication switch Q5, and the second end of the indication switch Q5 is grounded; the first end of the third current-limiting resistor R505 is connected to the output terminal of the fifth amplifier U5, and the second end of the third current-limiting resistor R505 is connected to the control terminal of the indication switch Q5; the first end of the indication unit DL is connected to the first end of the indication switch Q5, and the second end of the indication unit DL is grounded.

[0044] The indicator unit DL can be a light-emitting diode.

[0045] Specifically, in conjunction with reference Figure 4 As shown, when the feedback voltage Vo' is higher than the reference voltage V ref When the output terminal P of the fifth amplifier U5 outputs a low-level signal, the indicator switch Q5 is turned off, the voltage difference between the positive and negative terminals of the indicator unit DL is greater than the turn-on voltage, and the indicator unit DL illuminates normally; when the feedback voltage Vo' is lower than the reference voltage V refWhen the signal is high, the output terminal P of the fifth amplifier U5 outputs a high-level signal, indicating that the switch Q5 is turned on. The voltage difference between the positive and negative terminals of the indicator unit DL is less than the turn-on voltage, and the indicator unit DL is turned off. By setting up the indicator unit, the monitoring results of the discharge voltage are displayed intuitively, reminding equipment operators to check for abnormal discharges, making it convenient to use. By setting up a feedback interface, the monitoring results of the discharge voltage are transmitted to the host computer system, facilitating data collection, storage, and querying. Abnormal discharge reports can be generated based on the discharge voltage detection results, facilitating statistical analysis.

[0046] See Figure 5 As shown, the power supply module 100 includes: a rectifier and filter circuit 110, a switching circuit 120, and at least one stage of voltage regulator circuit; the rectifier and filter circuit 110 is provided with a rectifier diode D0 and a filter capacitor C0, the positive terminal of the rectifier diode D0 is connected to the external power supply interface VIN, the negative terminal of the rectifier diode D0 is connected to the switching circuit, a fourth node is provided between the negative terminal of the rectifier diode D0 and the switching circuit 120, the first end of the filter capacitor C0 is connected to the fourth node, and the second end of the filter capacitor C0 is grounded; the control terminal of the switching circuit 120 is connected to the input interface of the power-on control signal (i.e., the ON / OFF signal interface), and the switching circuit 120 is turned on or off based on the level state of the power-on control signal; the voltage regulator circuit is used to regulate the power supply voltage when the switching circuit 120 is turned on, and outputs a power supply voltage with a preset voltage amplitude; the preset voltage amplitude is determined based on the operating voltage level of the components in the main switching unit and the drive module 200.

[0047] See Figure 5 As shown, the switching circuit 120 includes: a PNP type switching transistor and a base resistor R. b and emitter resistance R e .

[0048] See Figure 5 As shown, at least one stage of voltage regulator circuitry includes: a first-stage voltage regulator circuit 130 and a second-stage voltage regulator circuit 140 connected in a cascaded manner; the first-stage voltage regulator circuit 130 includes: a voltage regulator switch Q1, a first voltage regulator diode DZ1, and a first voltage regulator resistor R. Z1 Second voltage regulator R Z2 The positive terminal of the first Zener diode DZ1 is grounded, and the negative terminal of the first Zener diode DZ1 is connected to the control terminal of the Zener switch Q1; the first terminal of the Zener switch Q1 is connected to the switching circuit 120, and the second terminal of the Zener switch Q1 is connected to the second-stage voltage regulator circuit 140; the first Zener resistor R... Z1 The second regulating resistor R is connected between the control terminal of the Zener diode Q1 and the first terminal of the Zener diode Q1. Z2 The second-stage voltage regulator circuit 140 is connected between the first terminal and the second terminal of the Zener switch Q1; the second-stage voltage regulator circuit 140 includes: a third voltage regulator resistor R.Z3 The second Zener diode DZ2 and the Zener capacitor C Z Third voltage regulator resistor R Z3 The first terminal is connected to the second terminal of the Zener switch Q1, and the third Zener resistor R Z3 The second terminal is connected to the power supply output terminal; the positive terminal of the second Zener diode DZ2 is grounded, and the negative terminal of the second Zener diode DZ2 is connected to the first power supply output terminal; the voltage regulator capacitor C Z The first terminal is connected to the first power supply output terminal, and the voltage regulator capacitor C Z The second end is grounded.

[0049] See Figure 5 As shown, the boost module 300 includes at least a first boost transformer T1 and a second boost transformer T2; the control terminal of the first boost transformer T1 is connected to the main switch unit Q, the primary winding of the first boost transformer T1 is connected to the second power supply output terminal, and the secondary winding of the first boost transformer T1 is connected to the primary winding of the second boost transformer T2; the control terminal of the second boost transformer T2 is grounded, and the secondary winding of the second boost transformer T2 is connected to the positive ion discharge electrode TP+ via a forward discharge circuit, and / or connected to the negative ion discharge electrode TP- via a negative discharge circuit.

[0050] Based on the same inventive concept, embodiments of the present invention also provide a purification device, including: at least one discharge electrode and a discharge control circuit provided in any of the above embodiments, the discharge control circuit being used to control the discharge electrode to output a discharge voltage and to regulate the discharge voltage; wherein, the discharge electrode includes: a positive ion discharge electrode and / or a negative ion discharge electrode.

[0051] In this application, the purification equipment may be a negative ion purification equipment or a plasma purification equipment.

[0052] The technical solution of this invention integrates a discharge control circuit in the purification device. This discharge control circuit is equipped with a composite frequency driving unit, which adjusts the discharge voltage output by the discharge electrode based on the composite frequency. This solves the problem that existing purifiers cannot adjust the ion concentration around the purifier according to environmental needs, resulting in high power consumption and excessive ozone concentration. By adjusting the high voltage electric field strength of the purification device based on the composite frequency, the ion concentration adjustment performance is improved, and ozone concentration exceeding the standard due to continuous discharge is avoided. This is beneficial to improving the air purification effect and enhancing the user experience.

[0053] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A discharge control circuit for a purification device, the purification device comprising at least one discharge electrode, characterized in that, The discharge control circuit includes: The power module is used to output the power supply voltage based on the power-on control signal; The drive module shall include at least a composite frequency drive unit and a drive output unit; The composite frequency driving unit is used to output a first driving signal with a first frequency and a second driving signal with a second frequency, wherein the first frequency is greater than or equal to 10 times the second frequency; The drive output unit is used to control the main switch unit to turn on or off according to the first drive signal and the second drive signal; A boost module is used to boost the supply voltage based on the conduction state of the main switch unit in order to adjust the discharge voltage output by the discharge electrode. The composite frequency driving unit includes: a first oscillation circuit and a second oscillation circuit; The first oscillation circuit is connected to the power supply module and is used to output a first drive signal with a first frequency to the drive output unit; The second oscillation circuit is connected to the power supply module and is used to output a second drive signal with a second frequency to the drive output unit; Specifically, when the level of the second driving signal is higher than the level of the first driving signal, the main switch unit is turned off; when the level of the second driving signal is lower than the level of the first driving signal, the main switch unit is turned on; based on the difference between the first frequency and the second frequency, the main switch unit is periodically turned on.

2. The discharge control circuit according to claim 1, characterized in that, The oscillation frequency range of the first oscillation circuit is 1KHz to 10KHz, and the oscillation frequency range of the second oscillation circuit is 10Hz to 100Hz.

3. The discharge control circuit according to claim 2, characterized in that, The first oscillation circuit includes: a first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first capacitor; The first amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, and the output terminal is connected to the non-inverting input terminal of the drive output unit; The first end of the first resistor is connected to the power module, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, a first node is provided between the first resistor and the second resistor, and the first node is connected to the non-inverting input terminal of the first amplifier. The first end of the third resistor is connected to the non-inverting input terminal of the first amplifier, and the second end of the third resistor is connected to the output terminal of the first amplifier. The first end of the fourth resistor is connected to the power module, and the second end of the fourth resistor is connected to the output end of the first amplifier. The first end of the fifth resistor is connected to the inverting input terminal of the first amplifier, and the second end of the fifth resistor is connected to the output terminal of the first amplifier. The first terminal of the first capacitor is connected to the inverting input terminal of the first amplifier, and the second terminal of the first capacitor is grounded.

4. The discharge control circuit according to claim 2, characterized in that, The second oscillation circuit includes: a second amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a reverse protection diode, a ninth resistor, a tenth resistor, a second capacitor, and a multi-resistor parallel unit; The second amplifier has a non-inverting input terminal, an inverting input terminal, and an output terminal, and the output terminal of the second amplifier is connected to the inverting input terminal of the drive output unit; The first end of the sixth resistor is connected to the power module, the second end of the sixth resistor is connected to the first end of the seventh resistor, the second end of the seventh resistor is grounded, a second node is provided between the sixth resistor and the seventh resistor, and the second node is connected to the non-inverting input terminal of the second amplifier. The first end of the eighth resistor is connected to the second node, the second end of the eighth resistor is connected to the positive terminal of the anti-reverse diode, and the negative terminal of the anti-reverse diode is connected to the output terminal of the second amplifier. The first end of the ninth resistor is connected to the power module, and the second end of the ninth resistor is connected to the output end of the second amplifier. The first end of the tenth resistor is connected to the inverting input terminal of the second amplifier, the second end of the tenth resistor is connected to the first end of the multi-resistor parallel unit, and the second end of the multi-resistor parallel unit is connected to the output terminal of the second amplifier. The first terminal of the second capacitor is connected to the inverting input terminal of the second amplifier, and the second terminal of the second capacitor is grounded.

5. The discharge control circuit according to claim 2, characterized in that, The drive output unit includes: a pull-up resistor, a first pull-down resistor, a third amplifier, a main switch unit, and a third capacitor; The non-inverting input terminal of the third amplifier is connected to the first oscillation circuit, the inverting input terminal of the third amplifier is connected to the second oscillation circuit, and the output terminal of the third amplifier is connected to the control terminal of the main switching unit. The first end of the pull-up resistor is connected to the power module, and the second end of the first pull-down resistor is connected to the control terminal of the main switch unit. The first end of the first pull-down resistor is connected to the control terminal of the main switch unit, and the second end of the first pull-down resistor is grounded. The first end of the main switch unit is connected to the boost module, the second end of the main switch unit is grounded, and a third node is provided between the first end of the main switch unit and the boost module; The first terminal of the third capacitor is connected to the third node, and the second terminal of the third capacitor is grounded.

6. The discharge control circuit according to any one of claims 1 to 5, characterized in that, Also includes: A drive protection module is used to monitor the discharge voltage and output a drive protection signal based on the monitoring data; The drive protection module includes: a first protection resistor, a second protection resistor, a third protection resistor, a fourth capacitor, a fifth capacitor, a fourth amplifier, and a drive protection switch; The first end of the first protective resistor is connected to the power module, the second end of the first protective resistor is connected to the first end of the second protective resistor, and the second end of the second protective resistor is connected to the control terminal of the drive protection switch. The non-inverting input of the fourth amplifier is connected to the reference voltage power supply terminal, the inverting input of the fourth amplifier is connected to the feedback terminal of the discharge voltage, and the output of the fourth amplifier is grounded through the fourth capacitor. The first terminal of the fifth capacitor is connected to the inverting input terminal of the fourth amplifier, and the second terminal of the fifth capacitor is connected to the output terminal of the fourth amplifier. The output of the fourth amplifier is connected to the composite frequency driving unit via the third protection resistor, and the fourth amplifier is used to set the second driving signal.

7. The discharge control circuit according to any one of claims 1 to 5, characterized in that, Also includes: A discharge feedback module and a feedback interaction interface are provided. The discharge feedback module is used to monitor the discharge voltage and transmit the monitoring results to the feedback interaction interface. The discharge feedback module includes: a fifth amplifier, a sixth capacitor, and a first current-limiting resistor; The non-inverting input of the fifth amplifier is connected to the reference voltage power supply terminal, the inverting input of the fifth amplifier is connected to the feedback terminal of the discharge voltage, and the output of the fifth amplifier is connected to the feedback interaction interface via the first current limiting resistor. The first end of the sixth capacitor is connected to the power supply terminal, and the first end of the sixth capacitor is also connected to the output terminal of the fifth amplifier. The second end of the sixth capacitor is connected to the inverting input terminal of the fifth amplifier.

8. The discharge control circuit according to claim 7, characterized in that, The discharge feedback module further includes: a second pull-down resistor, a third pull-down resistor, a first discharge capacitor, and a second discharge capacitor; The first end of the second pull-down resistor is connected to the output terminal of the fifth amplifier, and the second end of the second pull-down resistor is grounded. The first discharge capacitor is connected in parallel with the second pull-down resistor; The first end of the third pull-down resistor is connected to the inverting input of the fifth amplifier, and the second end of the third pull-down resistor is grounded. The second discharge capacitor is connected in parallel with the third pull-down resistor.

9. The discharge control circuit according to claim 7, characterized in that, The discharge feedback module also includes an abnormality indication circuit, which is connected to the output terminal of the fifth amplifier and issues an indication signal according to the output level of the fifth amplifier. The discharge abnormality indication module includes: a second current-limiting resistor, a third current-limiting resistor, an indication switch, and an indication unit; The first end of the second current-limiting resistor is connected to the power module, the second end of the second current-limiting resistor is connected to the first end of the indicator switch, and the second end of the indicator switch is grounded. The first end of the third current-limiting resistor is connected to the output end of the fifth amplifier, and the second end of the third current-limiting resistor is connected to the control end of the indicator switch; The first end of the indicator unit is connected to the first end of the indicator switch, and the second end of the indicator unit is grounded.

10. The discharge control circuit according to any one of claims 1 to 5, characterized in that, The power module includes: a rectifier and filter circuit, a switching circuit, and at least one stage of voltage regulator circuit; The rectifier and filter circuit includes a rectifier diode and a filter capacitor. The positive terminal of the rectifier diode is connected to an external power supply interface, and the negative terminal of the rectifier diode is connected to the switching circuit. A fourth node is provided between the negative terminal of the rectifier diode and the switching circuit. The first end of the filter capacitor is connected to the fourth node, and the second end of the filter capacitor is grounded. The control terminal of the switching circuit is connected to the input interface of the power-on control signal, and the switching circuit is turned on or off based on the level state of the power-on control signal. The voltage regulator circuit is used to regulate the power supply voltage when the switching circuit is turned on, and output a power supply voltage with a preset voltage amplitude. The preset voltage amplitude is determined based on the operating voltage levels of the components in the main switch unit and the drive module.

11. The discharge control circuit according to claim 10, characterized in that, The at least one stage of voltage regulator circuit includes: a first stage voltage regulator circuit and a second stage voltage regulator circuit connected in a cascaded manner; The first-stage voltage regulator circuit includes: a voltage regulator switch, a first voltage regulator diode, a first voltage regulator resistor, and a second voltage regulator resistor; the positive terminal of the first voltage regulator diode is grounded, and the negative terminal of the first voltage regulator diode is connected to the control terminal of the voltage regulator switch; the first terminal of the voltage regulator switch is connected to the switching circuit, and the second terminal of the voltage regulator switch is connected to the second-stage voltage regulator circuit; the first voltage regulator resistor is connected between the control terminal of the voltage regulator switch and the first terminal of the voltage regulator switch; the second voltage regulator resistor is connected between the first terminal and the second terminal of the voltage regulator switch. The second-stage voltage regulator circuit includes: a third voltage regulator resistor, a second voltage regulator diode, and a voltage regulator capacitor; the first end of the third voltage regulator resistor is connected to the second end of the voltage regulator switch, and the second end of the third voltage regulator resistor is connected to the power supply output terminal; the positive terminal of the second voltage regulator diode is grounded, and the negative terminal of the second voltage regulator diode is connected to the first power supply output terminal; the first end of the voltage regulator capacitor is connected to the first power supply output terminal, and the second end of the voltage regulator capacitor is grounded.

12. The discharge control circuit according to any one of claims 1 to 5, characterized in that, The boost module includes at least a first boost transformer and a second boost transformer; The control terminal of the first step-up transformer is connected to the main switch unit, the primary winding of the first step-up transformer is connected to the second power supply output terminal, and the secondary winding of the first step-up transformer is connected to the primary winding of the second step-up transformer. The control terminal of the second step-up transformer is grounded, and the secondary winding of the second step-up transformer is connected to the positive ion discharge electrode via a forward discharge circuit, and / or connected to the negative ion discharge electrode via a negative discharge circuit.

13. A purification device, characterized in that, include: At least one discharge electrode and a discharge control circuit according to any one of claims 1 to 12, wherein the discharge control circuit is used to control the discharge electrode to output a discharge voltage and to regulate the discharge voltage; The discharge electrode includes a positive ion discharge electrode and / or a negative ion discharge electrode.

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