Circuit structure for automatic balance and fault protection of ion fan

Abstract

The utility model discloses a circuit structure for automatic balance and fault protection of an ion fan. An ion balance self-adjusting unit comprises a signal acquisition module, a signal processing module and a high-voltage output adjusting module which are connected in sequence. By arranging the ion balance self-adjusting unit, the multi-fault protection unit and the power supply control module, automatic balance adjustment, multi-fault protection and power supply control functions of ion output are realized, the ion output can be monitored and adjusted in real time, the electrostatic elimination effect is improved, a perfect fault protection mechanism is provided, and the service life of the device is prolonged. And safe and reliable operation of equipment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrostatic elimination equipment technical field, especially ion fan automatic balance and the circuit structure of fault protection. BACKGROUND

[0002] In the electrostatic elimination equipment, the ion fan is a commonly used static elimination device. The existing ion fan has deficiencies in maintaining ion balance, which is mainly due to the fixed parameter open-loop control method of the control circuit, which cannot adapt to environmental and load changes, automatically adjusts the output of positive and negative ions, resulting in large fluctuations in static elimination effect under different working conditions.

[0003] In addition, the fault protection function of the ion fan is not perfect, usually only providing basic overcurrent protection, and lacking monitoring and protection of other potential problems such as high voltage abnormalities and fan failures. This single protection mechanism is slow in responding to complex faults and cannot take effective measures in time, increasing the risk of equipment damage.

[0004] In terms of voltage monitoring and power control, the precision and stability of the traditional ion fan control circuit need to be improved. They often cannot accurately reflect the high-voltage output state, and lack effective control and protection mechanisms in the case of power fluctuations or abnormalities, which may cause unstable operation of the equipment and shorten its service life. At the same time, the existing circuit has insufficient anti-interference ability and is easily disturbed by external signals in the industrial environment, affecting the accuracy of control. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of circuit structure of ion fan automatic balance and fault protection, to solve the technical problems such as low ion balance control precision and imperfect fault protection in prior art.

[0006] To solve the above technical problems, the utility model provides a kind of circuit structure of ion fan automatic balance and fault protection, comprising:

[0007] Ion balance self-regulating unit, including signal acquisition module, signal processing module and high voltage output regulating module connected in sequence;The signal acquisition module includes double-terminal interface JP1 and bias voltage regulator VR1;The signal processing module includes first operational amplifier part and second operational amplifier part in series;The high voltage output regulating module includes N-channel MOS tube Q1;

[0008] Multiple fault protection unit, including voltage monitoring module and fan monitoring module;Wherein, the voltage monitoring module includes the signal acquisition module, the signal processing module and high voltage output regulating module of the ion balance self-regulating unit, and further includes third operational amplifier part;

[0009] The power control module includes a P-channel MOS tube Q2 and a triode Q3, which are used for power control and overvoltage protection.

[0010] Further, the signal acquisition module further comprises a resistor R1, a first pin of a double-terminal interface JP1 is grounded, a second pin of the double-terminal interface JP1 is electrically connected with the bias voltage regulator VR1 through the resistor R1; two ends of the bias voltage regulator VR1 are respectively connected with positive and negative power supplies.

[0011] Further, the first operational amplifier part comprises an operational amplifier U11.1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2 and a capacitor C3.

[0012] A third pin of the operational amplifier U11.1 is electrically connected with the second pin of the double-terminal interface JP1 through the capacitor C1, and the third pin is grounded; a second pin of the operational amplifier U11 is electrically connected with the second pin of the double-terminal interface JP1 through the resistor R2; a first pin of the operational amplifier U11 is electrically connected with the second pin of the operational amplifier U11 through the resistor R3 and the capacitor C2 in parallel; a fourth pin of the operational amplifier U11.1 is connected with a positive power supply, and an eighth pin of the operational amplifier U11 is connected with a negative power supply, and is also grounded through the capacitor C3.

[0013] Further, the second operational amplifier part comprises an operational amplifier U10.2, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C4.

[0014] A sixth pin of the operational amplifier U10.2 is electrically connected with the first pin of the operational amplifier U11 through the resistor R4; a fifth pin of the operational amplifier U10.2 is electrically connected with a positive power supply through the resistor R6, and is also grounded through the resistor R7; a seventh pin of the operational amplifier U10.2 is grounded through the capacitor C4, and is also electrically connected with the sixth pin of the operational amplifier U10.2 through the resistor R5.

[0015] Further, the high-voltage output adjustment module further comprises a resistor R8; a source electrode of the N-channel MOS tube Q1 is grounded, a drain electrode of the N-channel MOS tube Q1 is connected with a positive power supply, and a gate electrode of the N-channel MOS tube Q1 is electrically connected with the seventh pin of the operational amplifier U10.2 through the resistor R8.

[0016] Further, the third operational amplifier part comprises an operational amplifier U12.1, a resistor R9, a resistor R10 and a resistor R11.

[0017] The third pin of the operational amplifier U12.1 is electrically connected with the source of the NMOS tube Q1 through the resistor R9, the second pin of the operational amplifier U12.1 is electrically connected with the first pin of the operational amplifier U12.1, the first pin of the operational amplifier U12.1 is connected with one end of the resistor R10, the other end of the resistor R10 is output, and the other end of the resistor R10 is grounded through the resistor R11.

[0018] Further, the fan monitoring module comprises a three-terminal interface JP2 and a resistor R12, the first pin of the three-terminal interface JP2 is grounded, the second pin of the three-terminal interface JP2 outputs a signal, the third pin of the three-terminal interface JP2 is electrically connected with a positive power supply through the resistor R12, and the third pin of the three-terminal interface JP2 is also electrically connected with a fan state indicator.

[0019] Further, the power supply control module further comprises a resistor R13, a resistor R14, a resistor R15 and a resistor R16.

[0020] The source of the P-channel MOS tube Q2 and the drain of the P-channel MOS tube Q2 are electrically connected with a positive power supply, the gate of the P-channel MOS tube Q2 is connected with one end of the resistor R14, the other end of the resistor R14 is electrically connected with the collector of the triode Q3, one end of the resistor R13 is electrically connected with the gate of the P-channel MOS tube Q2, and the other end of the resistor R13 is electrically connected with the source of the P-channel MOS tube Q2; the base of the triode Q3 is connected with a circuit switch through the resistor R15, the emitter of the triode Q3 is grounded, one end of the resistor R16 is grounded, and the other end of the resistor R16 is connected with one end of the resistor R14.

[0021] Further, the first operational amplification part is an operational amplification integration circuit.

[0022] Further, the second operational amplification part is a reverse proportional operational amplification circuit.

[0023] Compared with the prior art, the utility model has at least the following beneficial effects:

[0024] The utility model discloses a through set up ion balance self -adjusting unit, multiple fault protection unit and power control module, realize the automatic balance adjustment of ion output, multiple fault protection and power control function, and can real -time monitoring and regulation ion output, improve static elimination effect, have perfect fault protection mechanism simultaneously, ensure the safe and reliable operation of equipment. Further through adopting the series connection structure of operational amplifier amplification integral circuit and reverse proportional operational amplifier circuit, combine bias voltage regulation and high -voltage output regulation, improved the precision and stability of ion balance control. Meanwhile, through the cooperative work of fan monitoring module and voltage monitoring module, realized the overall monitoring of equipment operating state, improved the reliability and service life of equipment greatly. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the circuit structure schematic drawing of ion fan ion balance self -adjusting of the utility model one embodiment;

[0026] Figure 2 It is the circuit structure schematic drawing of voltage monitoring module of the utility model one embodiment;

[0027] Figure 3 It is the circuit structure schematic drawing of fan monitoring module of the utility model one embodiment;

[0028] Figure 4 It is the circuit structure schematic drawing of power control module of the utility model one embodiment. DETAILED DESCRIPTION

[0029] The utility model discloses a kind of circuit structures of ion fan automatic balance and fault protection, which will be described in more detail below in conjunction with schematic diagram, wherein the preferred embodiment of the utility model is shown, it should be understood that the utility model described herein can be modified by those skilled in the art, while still achieving the advantageous effects of the utility model. Therefore, the following description should be understood as extensive knowledge for those skilled in the art, and not as a limitation on the utility model.

[0030] The utility model will be described in more detail in the following paragraphs with reference to the drawings. The advantages and features of the utility model will be more apparent according to the following description. It should be noted that the drawings are all very simplified and all use non-precise proportions, only to facilitate, clearly assist the purpose of explaining the embodiments of the utility model.

[0031] As shown in Figures 1 to 4 The utility model discloses a kind of circuit structures of ion fan automatic balance and fault protection, which includes ion balance self -adjusting unit, multiple fault protection unit and power control module.

[0032] Specifically, as Figure 1As shown, the ion balance self-adjusting unit comprises a signal acquisition module, a signal processing module and a high-voltage output adjusting module connected in sequence.

[0033] In a specific embodiment, the signal acquisition module comprises a two-terminal interface JP1, a bias voltage regulator VR1 and a resistor R1, a first pin of the two-terminal interface JP1 is grounded, a second pin of the two-terminal interface JP1 is electrically connected with the bias voltage regulator VR1 through the resistor R1; both ends of the bias voltage regulator VR1 are connected with +12V and -12V voltage, for providing an adjustable reference voltage.

[0034] In the embodiment, the signal processing module comprises a first operational amplifier part and a second operational amplifier part connected in series.

[0035] The first operational amplifier part comprises an operational amplifier U11.1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2 and a capacitor C3. Among them, a third pin of the operational amplifier U11.1 is electrically connected with the second pin of the two-terminal interface JP1 through the capacitor C1, and the third pin is grounded. A second pin of the operational amplifier U11.1 is electrically connected with the second pin of the two-terminal interface JP1 through the resistor R2. A first pin of the operational amplifier U11.1 is electrically connected with the second pin of the operational amplifier U11.1 through the resistor R3 and the capacitor C2 connected in parallel, constituting an integration circuit. A fourth pin of the operational amplifier U11.1 is connected with a positive power supply, and an eighth pin is connected with a negative power supply and grounded through the capacitor C3.

[0036] The second operational amplifier part comprises an operational amplifier U10.2, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C4. A sixth pin of the operational amplifier U10.2 is electrically connected with the first pin of the operational amplifier U11.1 through the resistor R4. A fifth pin of the operational amplifier U10.2 is electrically connected with a positive power supply through the resistor R6, and is grounded through the resistor R7, forming a reverse proportional operational amplifier circuit. A seventh pin of the operational amplifier U10.2 is grounded through the capacitor C4, and is electrically connected with the sixth pin of the operational amplifier U10.2 through the resistor R5, realizing negative feedback.

[0037] The high-voltage output adjusting module comprises an N-channel MOS tube Q1 and a resistor R8. A source of the N-channel MOS tube Q1 is grounded, a drain of the N-channel MOS tube Q1 is connected with a positive power supply, and a gate of the N-channel MOS tube Q1 is electrically connected with the seventh pin of the operational amplifier U10.2 through the resistor R8, and the resistor R8 is used for current limiting protection.

[0038] In the embodiment, as shown in FIG. 2, the ion balance self-adjusting unit is connected with a high-voltage power supply, and the high-voltage power supply is connected with a high-voltage electrode and a ground electrode. Figures 2-3As shown, the multiple fault protection unit comprises a voltage monitoring module and a fan monitoring module, wherein the voltage monitoring module comprises the signal acquisition module, the signal processing module and the high voltage output adjustment module of the ion balance self-adjusting unit, and further comprises a third operational amplifier part.

[0039] The third operational amplifier part comprises an operational amplifier U12.1, a resistor R9, a resistor R10 and a resistor R11. The third pin of the operational amplifier U12.1 is electrically connected to the source of an NMOS tube Q1 through the resistor R9, the second pin of the operational amplifier U12.1 is electrically connected to the first pin, the first pin is connected to one end of the resistor R10, the other end of the resistor R10 is output, and is grounded through the resistor R11.

[0040] In the embodiment, the fan monitoring module comprises a three-terminal interface JP2 and a resistor R12. The first pin of the three-terminal interface JP2 is grounded, the second pin outputs a signal, and the third pin is electrically connected to a positive power supply through the resistor R12 and is electrically connected to a fan state indicator.

[0041] In the embodiment, as shown in the figure, Figure 4 The power supply control module comprises a P-channel MOS tube Q2, a transistor Q3, a resistor R13, a resistor R14, a resistor R15 and a resistor R16, wherein the Q2 is used for power supply control, and the Q3 is used for overvoltage protection. The source of the P-channel MOS tube Q2 and the drain of the P-channel MOS tube Q2 are electrically connected to a positive power supply, the gate of the P-channel MOS tube Q2 is connected to one end of the resistor R14, the other end of the resistor R14 is electrically connected to the collector of the transistor Q3, one end of the resistor R13 is electrically connected to the gate of the P-channel MOS tube Q2, and the other end of the resistor R13 is electrically connected to the source of the P-channel MOS tube Q2; the base of the transistor Q3 is connected to a circuit switch through the resistor R15, the emitter of the transistor Q3 is grounded, one end of the resistor R16 is grounded, and the other end of the resistor R16 is connected to one end of the resistor R14.

[0042] The specific working process of the ion fan automatic balance and fault protection circuit is as follows:

[0043] In the normal working state of the ion fan, the positive high voltage remains a fixed value, and the negative high voltage value is adjusted through the ion balance self-adjusting unit, so that the ion balance degree of the fan is close to 0V.

[0044] Specifically, when the ion fan is in normal operation, the positive and negative ions generated by the discharge electrode are blown by the fan airflow to the metal induction net on the front cover, and a weak alternating voltage is formed on the metal induction net. The weak alternating voltage on the metal induction net is transferred through the two-terminal interface JP1, superimposes the bias DC voltage provided by the bias voltage regulator VR1, and is processed by the integral circuit composed of the operational amplifier U11.1 in the first operational amplification part. In the normal working state, the first pin of the operational amplifier U11.1 outputs a voltage signal in the range of 0.5-0.7V.

[0045] The voltage signal is then processed by the reverse proportional operational amplifier circuit composed of the operational amplifier U10.2 in the second operational amplification part, and the output signal of the seventh pin is used to drive the gate of the N-channel MOS tube Q1. In the normal working condition, the N-channel MOS tube Q1 works in the linear amplification zone, and the gate voltage value is in a positive proportional relationship with the source voltage value, and the negative voltage value of the source is in a positive proportional relationship with the high voltage value of the negative electrode of the discharge electrode.

[0046] When the positive needle tip of the discharge electrode of the ion fan is contaminated or passivated, the positive discharge intensity of the needle tip is weakened, and the positive high voltage of the discharge electrode is also weakened. At this time, the induction voltage of the positive and negative ions on the metal induction net is processed by the operational amplifier U11.1, and a voltage signal greater than 0.7V is output at the first pin. After the signal is processed by the operational amplifier U10.2 and the N-channel MOS tube Q1, the source output voltage of Q1 is reduced, and finally the negative high voltage of the discharge electrode is reduced, a new balance state is formed with the weakened positive high voltage of the discharge electrode, so that the ion balance degree of the ion fan is maintained close to 0V.

[0047] On the contrary, when the negative needle tip of the discharge electrode of the ion fan is contaminated or passivated, the negative discharge intensity of the needle tip is weakened, and the negative high voltage of the discharge electrode is also weakened. At this time, the induction voltage of the positive and negative ions on the metal induction net is processed by the operational amplifier U11.1, and a voltage signal less than 0.5V is output at the first pin. After the signal is processed by the operational amplifier U10.2 and the N-channel MOS tube Q1, the source output voltage of Q1 is increased, and finally the negative high voltage of the discharge electrode is increased, a new balance state is formed with the positive high voltage of the discharge electrode, so that the ion balance degree of the ion fan is maintained close to 0V.

[0048] The multiple fault protection unit of the application comprises two main protection circuits: a high voltage abnormality detection protection circuit and a fan failure detection protection circuit. The high voltage abnormality detection protection circuit can detect abnormal conditions such as positive and negative high voltage open-phase, high voltage short circuit, and removal of the metal induction net.

[0049] The working principle of the high-voltage abnormality detection protection circuit is as follows:

[0050] When abnormal conditions such as positive high-voltage open-phase, high-voltage short-circuit or the metal induction net being removed occur, the voltage signal on the metal induction net is transferred through the two-terminal interface JP1, superimposes the bias DC voltage provided by the bias voltage regulator VR1, and is processed by the integral circuit composed of the operational amplifier U11.1, and a voltage signal close to the operational amplifier power supply voltage +12V is output at the first pin thereof. After being processed by the reverse proportional operational amplifier circuit composed of the operational amplifier U10.2, a voltage signal close to 0V is output at the seventh pin thereof. Since the voltage signal is too small to effectively drive the gate of the N-channel MOS tube Q1, Q1 works in the cut-off state. At this time, the source voltage of Q1 is close to 0V, and after being processed by the voltage follower and resistance voltage dividing circuit composed of the operational amplifier U12.1, a voltage signal close to 0V is input to the ADC of the single-chip microcomputer. When the single-chip microcomputer detects that the voltage is close to 0V in the ion air blower working state, it is determined that the positive high-voltage open-phase or the metal induction net removal fault occurs.

[0051] When negative high-voltage open-phase occurs, the voltage signal on the metal induction net is processed through the same signal path, and a voltage signal close to the operational amplifier power supply voltage -12V is output at the first pin of the operational amplifier U11.1. After being processed by the operational amplifier U10.2, a voltage signal close to the operational amplifier power supply voltage +24V is output at the seventh pin thereof. This larger voltage signal drives the gate of the N-channel MOS tube Q1, so that Q1 works in the saturation state. At this time, the source voltage of Q1 is close to the operational amplifier power supply voltage +24V, and after being processed by the operational amplifier U12.1 and the resistance voltage dividing circuit, a voltage signal close to 3.3V is input to the ADC of the single-chip microcomputer. When the single-chip microcomputer detects that the voltage is close to 3.3V in the ion air blower working state, it is determined that the negative high-voltage open-phase fault occurs.

[0052] The working principle of the fan fault detection module is as follows:

[0053] When the fan normally operates, the second pin of the three-terminal interface JP2 outputs a low-level signal; when the fan stops working, a high-level signal is output. By detecting the level state of the pin, whether the fan has a fault can be determined. Specifically, when the ion air blower is in the working state, if it is detected that the second pin of the three-terminal interface JP2 outputs a high-level signal, it indicates that the fan has a fault.

[0054] Once any of the above fault conditions (including positive high voltage open phase, negative high voltage open phase, high voltage short circuit, metal mesh removal or fan failure) is detected, the power control module responds immediately. Specifically, by controlling the on state of the P-channel MOS transistor Q2, the circuit power is immediately cut off, and the ion fan stops working. This fast response protection mechanism can effectively prevent further damage to the equipment, while ensuring personnel safety.

[0055] The utility model discloses a signal collection, processing and output adjustment control, realized the accurate regulation of ion output, the integral action of first operational amplifier part and the reverse proportional operation of second operational amplifier part are combined, and the control precision is improved obviously, simultaneously, the setting of multiple fault protection mechanism also has guaranteed the security of equipment under the abnormal state.

[0056] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the utility model claims and their equivalents, the utility model also intends to include these modifications and variations.

Claims

1. A circuit structure for automatic balancing and fault protection of an ion air blower, characterized by, The ion balance self-adjusting unit comprises a signal acquisition module, a signal processing module and a high-voltage output adjusting module connected in sequence. The signal acquisition module comprises a two-terminal interface JP1 and a bias voltage regulator VR1; the signal processing module comprises a first operational amplifier part and a second operational amplifier part connected in series; and the high-voltage output adjusting module comprises an N-channel MOS tube Q1. The multiple fault protection unit comprises a voltage monitoring module and a fan monitoring module; wherein the voltage monitoring module comprises the signal acquisition module, the signal processing module and the high-voltage output adjusting module of the ion balance self-adjusting unit, and further comprises a third operational amplifier part. The power supply control module comprises a P-channel MOS tube Q2 and a triode Q3, and is used for power supply control and overvoltage protection. The signal acquisition module further comprises a resistor R1; a first pin of the two-terminal interface JP1 is grounded; and a second pin of the two-terminal interface JP1 is electrically connected with the bias voltage regulator VR1 through the resistor R1; and the bias voltage regulator VR1 is connected with positive and negative power supplies respectively.

2. The circuit structure of claim 1, wherein, The first operational amplifier part comprises an operational amplifier U11.1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2 and a capacitor C3.

3. The circuit structure of claim 1, wherein, The third pin of the operational amplifier U11.1 is electrically connected with the second pin of the two-terminal interface JP1 through the capacitor C1, and is grounded; the second pin of the operational amplifier U11 is electrically connected with the second pin of the two-terminal interface JP1 through the resistor R2; the first pin of the operational amplifier U11 is electrically connected with the second pin of the operational amplifier U11 through the resistor R3 and the capacitor C2 in parallel; the fourth pin of the operational amplifier U11.1 is connected with a positive power supply; and the eighth pin of the operational amplifier U11 is connected with a negative power supply, and is further grounded through the capacitor C3. The second operational amplifier part comprises an operational amplifier U10.2, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C4.

4. The circuit structure of claim 1, wherein, The sixth pin of the operational amplifier U10.2 is electrically connected with the first pin of the operational amplifier U11 through the resistor R4; the fifth pin of the operational amplifier U10.2 is electrically connected with a positive power supply through the resistor R6, and is further grounded through the resistor R7; and the seventh pin of the operational amplifier U10.2 is grounded through the capacitor C4, and is further electrically connected with the sixth pin of the operational amplifier U10.2 through the resistor R5. The high-voltage output adjusting module further comprises a resistor R8; the source of the N-channel MOS tube Q1 is grounded; the drain of the N-channel MOS tube Q1 is connected with a positive power supply; and the gate of the N-channel MOS tube Q1 is electrically connected with the seventh pin of the operational amplifier U10.2 through the resistor R8.

5. The circuit structure of claim 1, wherein, The third operational amplifier part comprises an operational amplifier U12.1, a resistor R9, a resistor R10 and a resistor R11.

6. The circuit structure of claim 1, wherein, ​ The third pin of the operational amplifier U12.1 is electrically connected with the source of the NMOS Q1 through the resistor R9, the second pin of the operational amplifier U12.1 is electrically connected with the first pin of the operational amplifier U12.1, the first pin of the operational amplifier U12.1 is connected with one end of the resistor R10, the other end of the resistor R10 is an output, and the other end of the resistor R10 is grounded through the resistor R11.

7. The circuit structure of claim 1, wherein, The fan monitoring module comprises a three-terminal interface JP2 and a resistor R12, the first pin of the three-terminal interface JP2 is grounded, the second pin of the three-terminal interface JP2 outputs a signal, the third pin of the three-terminal interface JP2 is electrically connected with a positive power supply through the resistor R12, and the third pin of the three-terminal interface JP2 is also electrically connected with a fan state indicator.

8. The circuit structure of claim 1, wherein, The power supply control module further comprises a resistor R13, a resistor R14, a resistor R15 and a resistor R16. The source of the P-channel MOS Q2 and the drain of the P-channel MOS Q2 are electrically connected with a positive power supply, the gate of the P-channel MOS Q2 is connected with one end of the resistor R14, the other end of the resistor R14 is electrically connected with the collector of the transistor Q3, one end of the resistor R13 is electrically connected with the gate of the P-channel MOS Q2, and the other end of the resistor R13 is electrically connected with the source of the P-channel MOS Q2; the base of the transistor Q3 is connected with a circuit switch through the resistor R15, the emitter of the transistor Q3 is grounded, one end of the resistor R16 is grounded, and the other end of the resistor R16 is connected with one end of the resistor R14.

9. The circuit structure of claim 1, wherein, The first operational amplifier part is an operational amplifier integration circuit.

10. The circuit structure of claim 1, wherein, The second operational amplifier part is a reverse proportional operational amplifier circuit.

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