Electronic circuit, negative ion generator and automobile negative ion generator

Abstract

The utility model provides an electronic circuit, a negative ion generator and an automobile negative ion generator. The electronic circuit comprises a power supply input circuit, a power supply management chip, a buffer circuit, an isolation transformer, a voltage feedback circuit, a switching frequency selection circuit and a voltage doubling circuit. The electronic circuit controls an MOSFET switch through a power management chip, power input transmits energy to a high-voltage output side through an isolation transformer, high-voltage output feeds back a voltage acquisition signal to a low-side winding through the isolation transformer, and the voltage signal acquired by the low-side winding is proportional to the output voltage of the isolation transformer. The proportionality coefficient is determined by the turn ratio of the isolation transformer; the output end of the isolation transformer is connected with the voltage doubling circuit, and the finally output negative high voltage is equal to the multiple of the output voltage of the isolation transformer multiplied by the voltage doubling circuit. According to the utility model, a brand new topological structure is used, the switching frequency can be controlled, the output voltage can be stabilized, the Burst working mode is provided, and the energy conversion efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of negative ion generation, in particular to an electronic circuit, a negative ion generator and a car negative ion generator. Background Art

[0002] The primary function of a negative ion generator in a car is to purify the air and improve the interior environment. They generate a large number of electrons that combine with oxygen molecules in the air to form negative air ions. These negative ions improve the air quality inside the vehicle, reducing the concentration of harmful substances, thereby reducing health risks for the driver and passengers. They can also boost the driver's spirits, relieve fatigue, increase lung oxygen levels, improve lung function, and effectively kill viruses inside the vehicle. In short, a negative ion generator in a car plays a vital role in improving driving comfort and the overall quality of the interior environment.

[0003] The structure of existing negative ion generators generally adopts a self-excited oscillation transistor solution and a transformer topology. The self-excited oscillation structure of the transistor is simple and economical, but its frequency is difficult to control, the output voltage is related to the input voltage, and the voltage output fluctuates greatly. Utility Model Content

[0004] The purpose of this utility model is to provide an electronic circuit for a negative ion generator to solve the problems of uncontrollable frequency, uncontrollable output voltage, and low efficiency caused by the triode self-excited oscillation topology in existing negative ion generators. The specific technical solutions of this utility model are as follows:

[0005] An electronic circuit for a negative ion generator includes a power input circuit, a power management chip, a buffer circuit, an isolation transformer, a voltage feedback circuit, a switching frequency selection circuit, and a voltage doubling circuit;

[0006] The output end of the power input circuit is connected to the corresponding pin of the power management chip, the input end of the buffer circuit and the input end of the isolation transformer. The output end of the buffer circuit is connected to the corresponding pin of the power management chip. The pin of the isolation transformer is correspondingly connected to the pin of the power management chip. The voltage feedback circuit is connected between the power management chip and the corresponding pin of the isolation transformer. The switching frequency selection circuit is connected to the corresponding pin of the power management chip. The voltage doubling circuit is connected to the output end of the isolation transformer.

[0007] Further, the power management chip is used to control the MOSFET switch for boosting and collect the feedback voltage and current for monitoring. The power management chip is a micropower boost chip, which integrates a MOSFET structure and a current sampling circuit inside, and has a Burst control mode at the same time. The power management chip has 16 pins. The EN pin and the VIN pin are connected to the output end of the power input circuit. The FBX pin is connected to the output end of the voltage feedback circuit. The SW1 pin and the SW2 pin are connected to the corresponding pins of the isolation transformer.

[0008] Further, the isolation transformer is used to achieve high-voltage and low-voltage isolation and electromagnetic energy conversion. The isolation transformer includes a primary winding Np1, a secondary winding Np2 and a tertiary winding Ns. The first winding Np1 is the primary winding, and the second winding Np2 is the auxiliary winding.

[0009] The input pin of the first winding Np1 is connected to the output end of the power input circuit. The output pin of the first winding Np1 is connected to the SW1 pin and the SW2 pin of the power management chip. One pin of the second winding Np2 is connected to the input end of the voltage feedback circuit, and the other pin of the second winding Np2 is grounded. The two pins of the tertiary winding Ns are connected to the voltage multiplier circuit.

[0010] Further, the buffer circuit is used to protect the electronic components in the circuit from the influence of voltage mutation. The buffer circuit is an RCD buffer circuit composed of a resistor, a capacitor and a diode. The output end of the buffer circuit is connected to the SW1 pin and the SW2 pin of the power management chip.

[0011] Further, the voltage feedback circuit is used to transmit the feedback voltage signal of the isolation transformer to the power management chip to achieve precise output voltage regulation. The voltage feedback circuit includes a first resistor, a second resistor, a first capacitor and a first diode. The first resistor and the second resistor are connected in series and then connected in parallel with the first capacitor. One end of the parallel connection is grounded, and the other end is connected to the cathode of the first diode. The anode of the first diode is connected to the pin of the second winding Np2. The FBX pin of the power management chip is connected between the first resistor and the second resistor.

[0012] Further, the switching frequency selection circuit is used to select different switching frequencies. The switching frequency selection circuit includes a third resistor. One end of the third resistor is connected to the RT pin of the power management chip, and the other end is connected to the ground.

[0013] Further, the voltage multiplier circuit is used to select a multi-stage voltage multiplier circuit according to actual requirements to control the specific amplitude of the voltage output. The voltage multiplier circuit includes a plurality of energy storage capacitors, a plurality of current limiting resistors, and a plurality of rectifier diodes.

[0014] Further, the power input circuit includes a power input port, a first input capacitor, and a second input capacitor. The first input capacitor and the second input capacitor are connected in parallel, one end is connected to the positive terminal of the power input port, and the other end is connected to the negative terminal of the power input port and grounded.

[0015] The present invention also provides a negative ion generator, which includes the electronic circuit of the above-mentioned negative ion generator, and further includes a housing, a control panel, a negative ion generating device, a filtering device, and a negative ion release port.

[0016] The present invention also provides an automotive negative ion generator, which includes the electronic circuit of the above-mentioned negative ion generator, and the components of the electronic circuit are all selected as automotive-grade components.

[0017] The electronic circuit of a negative ion generator provided by the present invention has the following beneficial effects compared with the prior art:

[0018] The electronic circuit of a negative ion generator provided by the present invention uses a brand-new topology structure, and controls the switching of the MOSFET through a power control chip. Compared with the traditional triode self-excited oscillation circuit, it has accurate and adjustable frequency output, the output voltage of the isolation transformer will not fluctuate greatly with the fluctuation of the input voltage, and it always works in the Burst working mode under the application of a negative ion generator with a light load, improving the conversion efficiency of the application. Integrating the present invention into automotive products and selecting automotive-grade components can purify the air in the vehicle according to user needs, further enhancing the user's driving experience. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the electronic circuit structure of a negative ion generator provided by the present invention;

[0020] Figure 2 is a schematic diagram of the output voltage simulation of the electronic circuit of a negative ion generator provided in an embodiment of the present invention. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings provided by the present invention. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention.

[0022] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connection" and "coupling" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] In the description of the present utility model, the orientation or positional relationships such as "upper", "lower", "left", "right", "front", "rear", "center", "horizontal", "vertical", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model.

[0024] Embodiment:

[0025] This embodiment provides an electronic circuit of a negative ion generator. Refer to Figure 1 As shown, the electronic circuit includes a power input circuit 1, a power management chip 2, a buffer circuit 3, an isolation transformer 4, a voltage feedback circuit 5, a switching frequency selection circuit 6, and a voltage multiplier circuit 7. The output terminal of the power input circuit 1 is connected to the corresponding pins of the power management chip 2, the buffer circuit 3, and the isolation transformer 4. The output terminal of the buffer circuit 3 is connected to the corresponding pins of the power management chip 2. The pins of the isolation transformer 4 are correspondingly connected to the pins of the power management chip 2. The voltage feedback circuit 5 is connected between the corresponding pins of the power management chip 2 and the isolation transformer 4. The switching frequency selection circuit 6 is connected to the corresponding pins of the power management chip 2. The voltage multiplier circuit 7 is connected to the output terminal of the isolation transformer 4.

[0026] Among them, the power management chip 2 is used to control the MOSFET switch to boost the voltage and collect the feedback voltage and current for monitoring; the buffer circuit 3 is used to protect the electronic components in the circuit from the influence of voltage mutation; the isolation transformer 4 is used to achieve high and low voltage isolation and electromagnetic energy conversion; the voltage feedback circuit 5 is used to transmit the feedback voltage signal of the isolation transformer to the power management chip to achieve precise output voltage regulation. The switching frequency selection circuit 6 is used to select different switching frequencies; the voltage multiplier circuit 7 is used to select a multi-stage voltage multiplier circuit according to actual needs to control the specific amplitude of the voltage output.

[0027] For the electronic circuit of the above negative ion generator, by using a power management chip to control the MOSFET switch, the power input transfers energy to the high-voltage output side through an isolation transformer. At the same time, the high-voltage output feeds back the voltage acquisition signal to the low-side winding through the isolation transformer. The voltage signal collected by the low-side winding is proportional to the output voltage of the isolation transformer, and the proportionality coefficient is determined by the turns ratio of the isolation transformer. The output end of the isolation transformer is connected to the voltage multiplier circuit. Through the voltage multiplier circuit, the final negative high-voltage output is equal to the output voltage of the isolation transformer multiplied by the multiple of the voltage multiplier circuit.

[0028] The following is a specific description of the electronic circuit of this negative ion generator.

[0029] As a specific implementation of the power input circuit 1, the power input circuit 1 includes a power input port J1 and input capacitors C1 and C2. Capacitors C1 and C2 are connected in parallel, and one end is connected to the positive terminal of the power input port J1, and the other end is connected to the negative terminal of the power input port J1. The end connected to the negative terminal is connected to the ground. The output end of the power input circuit 1 is connected to the power management chip 2, the buffer circuit 3, and the isolation transformer 4.

[0030] Optionally, the input voltage value of the voltage input circuit is 9 - 12V.

[0031] As a specific implementation of the power management chip 2, the power management chip 2 selects a micropower boost chip, which integrates a MOSFET structure and a current sampling circuit inside and has a Burst control mode at the same time; it has 16 pins externally, all of which are configured through peripheral circuits. The EN pin and the VIN pin are connected to the output end of the power input circuit 1; the INTVCC pin is connected to the capacitor C4 and then to the ground; the Vee pin is connected to the resistor R1 and the capacitor C3 and then to the ground; the FBX pin is connected to the voltage feedback circuit 5; the RT pin is connected to the resistor R2 and then grounded; the SS pin is connected to the capacitor C5 and then grounded; the SW2 pin and the SW1 pin are jointly connected to the isolation transformer 4; the NC pin, the BIAS pin, the SYN / MD pin, and the GND pin are all directly connected to the ground.

[0032] As a specific implementation of the buffer circuit 3, the buffer circuit 3 consists of a resistor R3, a capacitor C6, and a diode D1 to form an RCD topology. The resistor R3 and the capacitor C6 are connected in parallel, and one end is connected to the output end of the power input circuit 1, and the other end is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the SW1 pin and the SW2 pin of the power management chip 2.

[0033] As a specific implementation of the isolation transformer 4, the isolation transformer 4 includes a first winding Np1, a second winding Np2, and a third winding Ns. The first winding Np1 stores the energy to be transferred, the third winding Ns outputs the transferred energy, and the second winding Np2 monitors the output voltage of the third winding. Among them, the first winding Np1 is the primary winding, and the second winding Np2 is the auxiliary winding. The pin 1 of the first winding Np1 is connected to the output end of the power input circuit 1, and the pin 2 of the first winding Np1 is connected to the SW2 pin and the SW1 pin of the power management chip 2; the pin 3 of the second winding Np2 is connected to the input end of the voltage feedback circuit 5, and the pin 4 of the second winding Np2 is grounded; the two pins of the third winding Ns are connected to the voltage multiplier circuit 7.

[0034] Optionally, the isolation transformer 4 is a customized product and uses a vehicle-grade skeleton structure.

[0035] As a specific implementation of the voltage feedback circuit 5, the input end of the voltage feedback circuit 5 is connected to the isolation transformer 4, and the output end is connected to the power management chip 2. The voltage feedback circuit 5 includes a diode D2, a capacitor C7, a resistor R4, and a resistor R5. The resistor R4 and the resistor R5 are connected in series and then connected in parallel with the capacitor C7. One end of the parallel connection is grounded, and the other end is connected to the cathode of the diode D2. The anode of the diode D2 is connected to the pin 3 of the second winding Np2 in the isolation transformer 4, and the FBX pin of the power management chip 2 is connected between the resistor R4 and the resistor R5. Therefore, the output voltage of the isolation transformer 4 feeds back a voltage signal to the power management chip 2 through the auxiliary winding Np2, and precise regulation of the output voltage can be achieved.

[0036] As a specific implementation of the switching frequency selection circuit 6, the switching frequency selection circuit includes a resistor R2. By changing the size of the resistor R2, different switching frequencies can be selected. One end of the resistor R2 is connected to the RT pin of the power management chip, and the other end is connected to the ground.

[0037] As a specific implementation of the voltage multiplier circuit 7, the voltage multiplier circuit 7 can select a multi-stage voltage multiplier circuit according to requirements to control the specific amplitude of the voltage output. The voltage multiplier circuit 7 includes a plurality of energy storage capacitors, a plurality of current limiting resistors, and a plurality of rectifier diodes. Specifically, one end of the capacitor C8 is connected to a pin of the third winding Ns, and the other end is respectively connected to the anode of the diode D3, the cathode of the diode D4, and the capacitor C9. The cathode of the diode D3 and the other pin of the third winding Ns are grounded together. The anode of the diode D4 is connected to the resistor R6. The other end of the capacitor C9 is connected to the anode of the diode D5 and the cathode of the diode D6. The other end of the resistor R6 is connected to the cathode of the diode D5 and then connected to the capacitor C10 and the capacitor C11 respectively. The anode of the diode D6 is connected to the resistor R7. The other end of the capacitor C10 is grounded. The other end of the capacitor C11 is connected to the other end of the resistor R7 and is commonly connected to the high-voltage output terminal.

[0038] The electronic circuit of a negative ion generator provided by the utility model uses a low-voltage input of 9V to 12V. Through the first voltage boost of the power management chip and the isolation transformer, a voltage of 1000V and above can be achieved. Then, a voltage multiplier circuit is used for secondary voltage boost to obtain a high voltage, and air is discharged to generate negative ions. Its highly integrated power control chip not only integrates a MOSFET switch and a current sampling circuit, but also can enter the Burst operating mode under light load or no load. Since the load of the negative ion generator is very small, this technical solution not only has a small volume, but also forms a closed-loop regulation of voltage and current through the voltage feedback circuit and the current acquisition circuit, can maintain the output voltage stable, has the Burst operating mode, greatly reduces the switching loss in this operating mode, further improves the efficiency and reliability. At the same time, the negative ion generation circuit is a light-load application, and the power management chip will work in the Burst operating mode, improving the conversion efficiency of the application.

[0039] Embodiment 2: This embodiment provides a negative ion generator, which includes the electronic circuit of the negative ion generator in Embodiment 1, and also includes a housing, a control panel, a negative ion generation device, a filtering device and a negative ion release port.

[0040] Embodiment 3: This embodiment provides an automotive negative ion generator, which includes the electronic circuit of the negative ion generator in Embodiment 1. All components and chips in the electronic circuit use automotive-grade chips and discrete devices to ensure that it meets the automotive use conditions.

[0041] Those skilled in the art of this technology should understand that the present utility model can be implemented in many other specific forms without departing from the spirit and scope of the present utility model. Based on the embodiments in the present utility model, any changes and modifications made by those of ordinary skill in the art of the present utility model according to the above disclosure shall fall within the protection scope of the claims.

Claims

1. An electronic circuit of a negative ion generator, characterized in that : It includes a power input circuit, a power management chip, a buffer circuit, an isolation transformer, a voltage feedback circuit, a switching frequency selection circuit, and a voltage multiplier circuit; The output terminal of the power input circuit is connected to the corresponding pins of the power management chip, the input terminal of the buffer circuit, and the input terminal of the isolation transformer. The output terminal of the buffer circuit is connected to the corresponding pins of the power management chip. The pins of the isolation transformer are correspondingly connected to the pins of the power management chip. The voltage feedback circuit is connected between the corresponding pins of the power management chip and the isolation transformer. The switching frequency selection circuit is connected to the corresponding pins of the power management chip. The voltage multiplier circuit is connected to the output terminal of the isolation transformer.

2. The electronic circuit of the negative ion generator according to claim 1, characterized in that : The power management chip is used to control the MOSFET switch to boost the voltage and collect the feedback voltage and current for monitoring. The power management chip is a micropower boost chip, which integrates a MOSFET structure and a current sampling circuit inside, and has a Burst control mode at the same time. The power management chip has 16 pins. The EN pin and the VIN pin are connected to the output terminal of the power input circuit. The FBX pin is connected to the output terminal of the voltage feedback circuit. The SW1 pin and the SW2 pin are connected to the corresponding pins of the isolation transformer.

3. The electronic circuit of the negative ion generator according to claim 2, characterized in that : The isolation transformer is used to achieve high-voltage and low-voltage isolation and electromagnetic energy conversion. The isolation transformer includes a first winding Np1, a second winding Np2, and a third winding Ns. The first winding Np1 is the primary winding, and the second winding Np2 is the auxiliary winding; The input pin of the first winding Np1 is connected to the output terminal of the power input circuit. The output pin of the first winding Np1 is connected to the SW1 pin and the SW2 pin of the power management chip. One pin of the second winding Np2 is connected to the input terminal of the voltage feedback circuit, and the other pin of the second winding Np2 is grounded. The two pins of the third winding Ns are connected to the voltage multiplier circuit.

4. The electronic circuit of the negative ion generator according to claim 2, characterized in that : The buffer circuit is used to protect the electronic components in the circuit from the influence of voltage mutations. The buffer circuit is an RCD buffer circuit composed of a resistor, a capacitor, and a diode. The output terminal of the buffer circuit is connected to the SW1 pin and the SW2 pin of the power management chip.

5. The electronic circuit of the negative ion generator according to claim 3, characterized in that : The voltage feedback circuit is used to transmit the feedback voltage signal of the isolation transformer to the power management chip to achieve precise output voltage regulation. The voltage feedback circuit includes a first resistor, a second resistor, a first capacitor, and a first diode. The first resistor and the second resistor are connected in series and then connected in parallel with the first capacitor. One end of the parallel connection is grounded, and the other end is connected to the cathode of the first diode. The anode of the first diode is connected to the pin of the second winding Np2. The FBX pin of the power management chip is connected between the first resistor and the second resistor.

6. The electronic circuit of the negative ion generator according to claim 2, characterized in that : The switching frequency selection circuit is used to select different switching frequencies. The switching frequency selection circuit includes a third resistor. One end of the third resistor is connected to the RT pin of the power management chip, and the other end is connected to the ground.

7. The electronic circuit of the negative ion generator according to claim 3, characterized in that : The voltage multiplier circuit is used to select a multi-stage voltage multiplier circuit according to actual requirements to control the specific amplitude of the voltage output. The voltage multiplier circuit includes a plurality of energy storage capacitors, a plurality of current limiting resistors, and a plurality of rectifier diodes.

8. The electronic circuit of the negative ion generator according to claim 1, characterized in that : The power input circuit includes a power input port, a first input capacitor, and a second input capacitor. After the first input capacitor and the second input capacitor are connected in parallel, one end is connected to the positive terminal of the power input port, and the other end is connected to the negative terminal of the power input port and grounded.

9. An anion generator, characterized in that: : An electronic circuit including the negative ion generator according to any one of claims 1-8 further includes a housing, a control panel, a negative ion generating device, a filtering device, and a negative ion release port.

10. An automotive negative ion generator, characterized in that: : An electronic circuit including the negative ion generator according to any one of claims 1-8, and components of the electronic circuit are all selected as automotive-grade components.

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