Double-voltage driving circuit of plasma generator

Abstract

The utility model discloses a double-voltage driving circuit of a plasma generator, which comprises a first control chip IC1, the first control chip IC1 is used for providing a fixed voltage and a variable voltage, and a fifth pin of the first control chip IC1 is connected with a live wire end of an input power supply J1 through a power supply branch; the input power supply J1 outputs 12V power supply voltage; a capacitor C11 is connected in parallel between the power supply branch and the grounding branch; the sixth pin of the first control chip IC1 is connected with the output branch; the anode end of the diode D2 is connected with the grounding branch; when the drive circuit needs an input voltage of 12V, the first control chip IC1 controls the drive circuit to be connected with the input power supply J1. When the drive circuit needs the input voltage of 5V, the first control chip IC1 controls the output branch to be switched to 5V and connected with the drive circuit, and the first control chip IC1 controls the first pin of the input power supply J1 to be connected with the grounding branch.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of plasma generator, especially a double voltage drive circuit of plasma generator. BACKGROUND

[0002] The plasma generator is used for generating positive and negative ions, and the input power supply of the drive circuit generates high-frequency voltage through LC filtering, high-frequency resonance circuit and primary coil of transformer in turn, and is coupled to the secondary output of the transformer to push the ion sheet (electrode) of the plasma generator to generate positive and negative ions.

[0003] However, the existing plasma generator generally adopts 5V or 12V driving voltage, but the two are not compatible, so there are the following shortcomings:

[0004] 1. Of course, there is also a separate development of a drive circuit board compatible with 12V and 5V different input power supply voltage, but it needs to modify the overall circuit, so it takes a long time and has a large work cycle, and has uncontrollable risks in the development process (such as wrong development direction or component damage caused by debugging);

[0005] Therefore, the existing supporting electronic components (including but not limited to transformers and the like) need to be changed accordingly, which not only increases the cost of materials, but also increases the management cost;

[0006] 2. The program of the programmable chip needs to be redeveloped to match the 12V and 5V different input power supply voltage of the electric appliance, and the development cost also increases;

[0007] 3. The different energy generated by the 12V and 5V different input power supply voltage of the electric appliance through high-frequency high voltage has a great influence on the stability of the release of the plasma; and has a great influence on the control of the release amount of the derivative (mainly ozone) in the plasma generation process (may cause the generation rate of the plasma to not meet the predetermined requirements);

[0008] 4. The reliability of the plasma air generator is greatly affected by the above factors (such as service life). UTILITY MODEL CONTENT

[0009] The main purpose of the utility model is to provide a double voltage drive circuit of plasma generator, which can realize circuit switching of 5V or 12V through improving the structure of the drive circuit, and can be embedded in the existing circuit, and has less influence on the release of the plasma.

[0010] To achieve the above purpose, the utility model provides a double voltage drive circuit of plasma generator, comprising:

[0011] A first control chip IC1 is used to provide a fixed voltage and a variable voltage,

[0012] A fifth pin of the first control chip IC1 is connected with a live wire end of an input power supply J1 through a power supply branch,

[0013] A zero wire end of the input power supply J1 is connected with a ground end through a grounding branch;

[0014] The input power supply J1 outputs a 12V power supply voltage;

[0015] A capacitor C11 is connected in parallel between the power supply branch and the grounding branch;

[0016] A resistor R13 is arranged between the power supply branch and a fourth pin of the first control chip IC1;

[0017] A sixth pin of the first control chip IC1 is connected with an output branch;

[0018] A capacitor C14 is connected in series between the output branch and a first pin of the first control chip IC1;

[0019] The output branch is connected with the grounding branch and is provided with a diode D2, an anode end of the diode D2 is connected with the grounding branch, a cathode end of the diode D2 is connected with the output branch, and the output branch is connected in series with an inductor L2;

[0020] A second pin of the first control chip IC1 is connected with the grounding branch,

[0021] A third pin of the first control chip IC1 outputs a feedback branch, and a resistor R11 is arranged between the feedback branch and the second pin,

[0022] A resistor R1-1 is connected between the feedback branch and the output branch;

[0023] When the input voltage required by the driving circuit is 12V, the first control chip IC1 controls the driving circuit to be connected with the input power supply J1;

[0024] When the input voltage required by the driving circuit is 5V, the first control chip IC1 controls the output branch to be switched to 5V and to be connected with the driving circuit, and the first control chip IC1 controls a first pin of the input power supply J1 to be connected with the grounding branch.

[0025] In actual design, through simple control of the first control chip IC1, the input voltage 12V is used as a fixed voltage to realize power supply for the driving circuit;

[0026] When the input voltage is 5V, the capacitor C14 is connected between the SW pin and the BST pin to supply power for the internal upper switch driving, the capacitor can drive the gate voltage to the supply voltage, thereby achieving the voltage reduction of 12V;

[0027] The voltage transformation of the power supply is more linear and simple, the output voltage can be directly connected with the driving circuit, the existing electronic components can not be replaced, and stable plasma release can be realized; in the preferred embodiment, the transformer of the driving circuit can be replaced or adjusted to a larger adjustable transformer, thereby adapting to different input voltages. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 The circuit diagram of the utility model;

[0029] Fig. 2 The driving circuit and the circuit diagram of the utility model. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.

[0032] In addition, if the embodiments of the utility model involve the description of "first" or "second", etc., the description of "first" or "second" is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0033] As Figs. 1-2 shown in the figure, a double-voltage driving circuit of a plasma generator comprises:

[0034] a first control chip IC1, which is used to provide a fixed voltage and a variable voltage,

[0035] a fifth pin of the first control chip IC1 is connected with a firewire end of an input power supply J1 through a power supply branch,

[0036] a zero line end of the input power supply J1 is connected with a ground end through a grounding branch;

[0037] the input power supply J1 outputs a 12V power supply voltage;

[0038] a capacitor C11 is connected in parallel between the power supply branch and the grounding branch;

[0039] a resistor R13 is arranged between the power supply branch and a fourth pin of the first control chip IC1;

[0040] a sixth pin of the first control chip IC1 is connected with an output branch;

[0041] a capacitor C14 is connected in series between the output branch and a first pin of the first control chip IC1;

[0042] the output branch is connected with the grounding branch and is provided with a diode D2, an anode end of the diode D2 is connected with the grounding branch, a cathode end of the diode D2 is connected with the output branch, and the output branch is connected in series with an inductor L2;

[0043] a second pin of the first control chip IC1 is connected with the grounding branch,

[0044] a third pin of the first control chip IC1 outputs a feedback branch, and a resistor R11 is arranged between the feedback branch and the second pin,

[0045] a resistor R1-1 is connected between the feedback branch and the output branch;

[0046] when the driving circuit needs an input voltage of 12V, the first control chip IC1 controls the driving circuit to be connected with the input power supply J1;

[0047] when the driving circuit needs an input voltage of 5V, the first control chip IC1 controls the output branch to be switched to 5V and to be connected with the driving circuit, and the first control chip IC1 controls a first pin of the input power supply J1 to be connected with the grounding branch.

[0048] In the actual design, through the simple control of the first control chip IC1, the input voltage 12V is a fixed voltage, thereby realizing the power supply of the driving circuit;

[0049] When the input voltage needs to be 5V, a capacitor C14 is connected between the SW pin and the BST pin, which supplies power to the internal gate switch driver. The capacitor can drive the gate voltage to the supply voltage, thereby realizing the voltage reduction of 12V.

[0050] The voltage conversion of the power supply is more linear and simple, and the output voltage can be directly connected to the driving circuit. The existing electronic components can be used without replacement, and stable plasma release can be realized. In the preferred embodiment, the transformer of the driving circuit can be replaced or adjusted to a larger adjustable transformer, thereby adapting to different input voltages.

[0051] Specifically, the first control chip IC1 is MP2456GJ-Z, which is packaged as TSOT23-6.

[0052] Specifically, MP2456GJ-Z is a green and energy-saving regulator. That is, the EA output voltage is proportional to the peak inductance current.

[0053] At the beginning of the cycle, M1 is off. The A output voltage is higher than the current detection amplifier output, and the output of the current comparator is lower. The rising edge of the 1.2MHZ CLK signal is used to set the RS flip-flop. Its output turns on M1, thereby connecting the SW pin and the inductor to the input power supply.

[0054] The increased inductance current is detected and amplified by the current detection amplifier. The slope compensation is added to the output of the current detection amplifier and compared with the error amplifier output of the PWVM comparator. When the sum of the current detection amplifier output and the slope compensation signal exceeds the EA output voltage, the RS flip-flop is reset, and M1 is off. The inductance current is conducted by the external Schottky rectifier diode (D1). If the sum of the current detection amplifier output and the slope compensation signal does not exceed the EA output of this cycle, the CLK falling edge will restart the flip-flop.

[0055] The output of the error amplifier combines the voltage difference between the feedback and the 0.8V bandgap reference. If the FB pin voltage below 0.81V increases the EA output voltage, it is called polarity. Since the EA output voltage is proportional to the peak inductance current, the output current will increase with the increase of the voltage.

[0056] MP2456GJ-Z has an internal soft-start of 0.6ms. The soft-start is to prevent the converter output voltage overshoot at start-up. When the chip starts up, the soft-start voltage (SS) generated by the internal circuit will slowly rise according to the rated rate. When SS is lower than the internal reference value (REF), SS will override REF, at which time the error amplifier uses SS as the reference value. When SS is higher than REF, REF reverts to the reference value.

[0057] When the capacitor at the output is very large (for example, 2200uF or even larger), the output voltage will rise slower than SS, because the current to charge the large output capacitor needs to be higher than the maximum output current capability of the chip. The entire start-up period will be current limited until Vo rises to the regulated value.

[0058] Specifically, the sixth pin is a SW pin, which is a switch output pin, thereby realizing switching between 12V and 5V voltages.

[0059] Specifically, the fifth pin is an IN input pin. (The input voltage range of MP2456GJ-Z is 4.5V- to -50V. C1 is needed to prevent large voltage spikes at the input; the maximum voltage of the present application is 12V, so in actual design, the voltage control load is smaller (i.e., buck), and the control is more linear)

[0060] Specifically, the fourth pin is a conduction regulator, thereby realizing automatic regulation of its voltage through resistance R13.

[0061] Specifically, the third pin is a feedback pin. (Used to obtain a predetermined voltage value and current value, by setting a predetermined output voltage. An external resistance divider R11 is connected between the output and GND. When the FB voltage is lower than 250mV, the frequency gain comparator can reduce the oscillator frequency to prevent the current from running out of control when a short circuit fault occurs.

[0062] Specifically, the first pin is a bootstrap pin, and a capacitor C14 is connected in series between the first pin and the sixth pin, thereby enabling the gate voltage to be driven to the supply voltage.

[0063] The above only describes the preferred embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the present application.

Claims

1. A dual voltage driving circuit of a plasma generator, characterized by, The utility model relates to a kind of driving circuit, including: First control chip IC1, the first control chip IC1 is used to provide fixed voltage and variable voltage, The fifth pin of the first control chip IC1 is connected with the firewire end of input power supply J1 by power supply branch, The zero line end of the input power supply J1 is connected with ground terminal by ground branch; The input power supply J1 outputs 12V power supply voltage; Capacitor C11 is connected in parallel between the power supply branch and the ground branch; Resistance R13 is arranged between the power supply branch and the fourth pin of the first control chip IC1; The sixth pin of the first control chip IC1 is connected with output branch; Capacitor C14 is connected in series between the output branch and the first pin of the first control chip IC1; The output branch is connected with ground branch and is provided with diode D2, the anode end of the diode D2 is connected with ground branch, the cathode end of the diode D2 is connected with output branch, and the output branch is connected with inductance L2 in series; The second pin of the first control chip IC1 is connected with ground branch, The third pin of the first control chip IC1 outputs feedback branch, and resistance R11 is arranged between the feedback branch and the second pin, Resistance R1-1 is connected between the feedback branch and the output branch. When the input voltage required by the driving circuit is 12V, the first control chip IC1 controls the driving circuit to be connected with the input power supply J1. When the input voltage required by the driving circuit is 5V, the first control chip IC1 controls the output branch to be switched to 5V and connected with the driving circuit, and the first control chip IC1 controls the first pin of the input power supply J1 to be connected with the ground branch.

2. The dual voltage drive circuit for a plasma generator as defined in claim 1, wherein: The first control chip IC1 is MP2456GJ-Z, and the package is TSOT23-6.

3. The dual voltage drive circuit for a plasma generator as defined in claim 1, wherein: The sixth pin of the first control chip IC1 is SW pin, and the SW pin is switch output pin.

4. The dual voltage drive circuit for a plasma generator of claim 1, wherein: The fifth pin of the first control chip IC1 is IN input pin.

5. The dual voltage drive circuit for a plasma generator as defined in claim 1, wherein: The fourth pin of the first control chip IC1 is on-off regulator.

6. The dual voltage drive circuit for a plasma generator as defined in claim 1, wherein: The third pin of the first control chip IC1 is feedback pin.

7. The dual voltage drive circuit for a plasma generator as defined in claim 1, wherein: The first pin of the first control chip IC1 is bootstrap pin.

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