WO2020007057A1

WO2020007057A1 - High-voltage electrostatic precipitator system and electronic device

Info

Publication number: WO2020007057A1
Application number: PCT/CN2019/076635
Authority: WO
Inventors: 谢颂婷; 熊再祥; 戴平安
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-07-06
Filing date: 2019-03-01
Publication date: 2020-01-09
Also published as: CN208810739U

Abstract

Disclosed is a high-voltage electrostatic precipitator system, used for an electronic device (500) having a pyroelectric infrared sensor. The pyroelectric infrared sensor comprises a filter (5). The high-voltage electrostatic precipitator system comprises a DC power supply module (100), a self-oscillating circuit (200), a transformer (T1), and a voltage N-multiplication rectifier circuit (400). The self-oscillating circuit (200) converts a DC voltage output by the DC power supply module to a first AC voltage, and applies the first AC voltage between two ends of a primary winding (N2), and a second AC voltage generated between a first end and a second end of a secondary winding (N3) is applied to between a first input end and a second input end of the voltage N-multiplication rectifier circuit (400). The voltage N-multiplication rectifier circuit (400) converts the second AC voltage to a high DC voltage, so as to form a high voltage electrostatic field between the first output end and the second output end of the voltage N-multiplication rectifier circuit. The filter is in the high voltage electrostatic field and can remove dust thereat.

Description

High-voltage electrostatic dust removal system and electronic device

Technical field

The present application relates to the field of consumer electronics technology, and in particular, to a high-voltage electrostatic dedusting system and an electronic device.

Background technique

At present, most electronic devices (for example, next to the lens of a laser projector) are equipped with a human body sensor. Its main function is to immediately trigger the main system to enter eye protection mode when it detects that someone is in front of the lens, so that the brightness of the outgoing light automatically changes. Weak to prevent eye injuries from light from the lens.

At present, the human body sensor often used is a pyroelectric infrared sensor (as shown in Fig. 1), which is mainly composed of a filter, a dual detection element, a field effect tube and other components. Among them, the filter allows light similar to infrared (7-10 μm) radiated by the human body to pass through. The transmitted infrared is received by the dual detection unit and converted into an electrical signal, which is amplified by the field effect tube and output to trigger eye protection. Mode to protect the human eye. However, when some dust or impurities are accumulated on the filter, the detection sensitivity of the detector will decrease, such as the human body's infrared radiation is blocked; or the light emitted by other heat sources has a center wavelength outside the human body's infrared radiation, but after accumulation After the dusty filter, reflection or refraction will occur, and its final center wavelength may fall within 7 to 10 μm; the above conditions will cause the human body's induction system of the laser projector to misreport.

Utility model content

In view of this, the present invention provides a high-voltage electrostatic dedusting system for an electronic device provided with a pyroelectric infrared sensor, so as to solve the problem that the detection of the pyroelectric infrared sensor is affected by the dust or impurities accumulated on the filter of the pyroelectric infrared sensor. Question of sensitivity.

The utility model provides a high-voltage electrostatic dedusting system. The high-voltage electrostatic dedusting system is applied to an electronic device provided with a pyroelectric infrared sensor. The pyroelectric infrared sensor includes a filter. The high-voltage electrostatic dedusting system includes A DC power module, a self-excited oscillation circuit, a transformer, and an N-fold voltage rectifier circuit, wherein the DC power module includes a positive terminal and a negative terminal, and the DC power module is used to output a DC voltage, and the transformer includes a primary winding and Secondary winding, N is an integer greater than or equal to 2; the self-excited oscillation circuit and the primary winding are connected in series between the positive terminal and the negative terminal; the first end of the secondary winding is connected A first input terminal of the N-fold voltage rectification circuit, and a second end of the secondary winding connected to a second input end of the N-fold voltage rectification circuit;

The self-excited oscillation circuit is configured to convert a DC voltage output by the DC power module into a first AC voltage, and load the first AC voltage between two ends of the primary winding, and the secondary winding A second AC voltage generated between the first terminal and the second terminal is loaded between the first input terminal and the second input terminal of the N-times voltage rectification circuit, and the N-times voltage rectification circuit is configured to apply the The second AC voltage is converted into a DC high voltage to form a high voltage electrostatic field between the first output terminal and the second output terminal of the N-times voltage rectification circuit, and the filter is in the high voltage electrostatic field to remove all The dust on the filter.

Wherein, N = 3, at this time, the N-times voltage rectification circuit includes a first rectifier diode, a second rectifier diode, a third rectifier diode, a first filter capacitor, a second filter capacitor, and a third filter capacitor;

The anode of the first rectifier diode is connected to the first end of the secondary winding, and the anode of the first rectifier tube is the first input end of the N-times voltage rectifier circuit; the anode of the first rectifier diode is connected An anode of the second rectifier diode, and a cathode of the second rectifier diode is connected to an anode of the third rectifier diode;

The positive electrode of the first filter capacitor is connected to the negative electrode of the first rectifier diode, the positive electrode of the second filter capacitor is connected to the negative electrode of the second rectifier diode, and the positive electrode of the third filter capacitor is connected to the third rectifier. The anode of the diode, and the anode of the third filter capacitor is the first output terminal of the N-fold voltage rectifier circuit; the anode of the second filter capacitor is connected to the first terminal of the secondary winding, and the first filter The negative electrode of the capacitor and the third filter capacitor are respectively connected to the second end of the secondary winding, the second input terminal of the N-times voltage rectification circuit is connected to the second end of the secondary winding, and the first The negative electrode of the filter capacitor is the second input terminal of the N-times voltage rectification circuit; the negative electrode of the third filter capacitor is the second output terminal of the N-times voltage rectification circuit.

Wherein, N = 2, and at this time, the N-times voltage rectification circuit includes a fourth rectifier diode, a fifth rectifier diode, a fourth filter capacitor, and a fifth filter capacitor;

The positive terminal of the fourth filter capacitor is connected to the first end of the secondary winding, and the positive terminal of the fourth filter capacitor is the first input terminal of the N-times voltage rectification circuit; the negative terminals of the fourth filter capacitor are respectively The anode of the fourth rectifier diode is connected to the anode of the fifth rectifier diode, the anode of the fifth rectifier diode is connected to the anode of the fifth filter capacitor, and the anode of the fifth filter capacitor is N times the The first output terminal of the voltage rectifier circuit; the negative electrode of the fourth rectifier diode and the positive electrode of the fifth filter capacitor are respectively connected to the second end of the secondary winding, and the negative electrode of the fourth rectifier diode is the The second input terminal of the N-fold voltage rectifier circuit; the positive electrode of the fifth filter capacitor is the second output terminal of the N-fold voltage rectifier circuit.

The self-excited oscillation circuit includes a first transistor, a first inductor, and a first resistor. A base of the first transistor is connected to one end of the first resistor. One end is connected to one end of the first inductor, the other end of the first inductor and the collector of the first triode are respectively connected to the positive end of the DC power module, and the emission of the first triode is Poles are connected to the primary winding; the self-excited oscillation module is configured to load the first AC voltage between two ends of the primary winding when the first triode is turned on.

The self-excited oscillation circuit includes a first triode, a first inductor, a first resistor, and a first capacitor. A base of the first triode is connected to one end of the first resistor. The other end of a resistor is connected to one end of the first inductor, and the other end of the first inductor and the collector of the first transistor are respectively connected to the positive end of the DC power module. A capacitor is connected in parallel between the positive end of the DC power module and the base of the first triode, and the emitter of the first triode is connected to the primary winding; the self-excited oscillation module is used for When the first transistor is turned on, the first AC voltage is loaded between two ends of the primary winding.

Wherein, a second resistor and a diode connected in series are connected in parallel between the positive terminal and the negative terminal of the DC power module, and the anode of the diode is connected to the positive terminal of the DC power module.

The input terminal of the self-excited oscillation circuit is connected to the positive terminal, and the output terminal of the self-excited oscillation circuit is connected to the primary winding; the positive terminal and the negative terminal of the DC power module are also connected in series. A protection resistor is connected; wherein one end of the protection resistor is connected to the positive terminal, and the other end of the protection resistor is respectively connected to the anode of the diode and the self-excited oscillation circuit; or, one end of the protection resistor is connected To the negative terminal, the other ends of the protection resistor are respectively connected to the second resistor and the primary winding.

The frequency of the first AC voltage is 5-20 kHz. Selectable is 10-18kHz. The higher the frequency of the alternating current, the less harm it will cause to the human body.

Wherein, the first output terminal and the second output terminal of the N-times voltage rectification circuit are respectively connected with a conductive plate.

The utility model also provides an electronic device including the high-voltage electrostatic dedusting system according to the first aspect of the utility model.

The high-voltage electrostatic dedusting system provided by the utility model is used for an electronic device provided with a pyroelectric infrared sensor, and through the combined action of a DC power module, a self-excited oscillation circuit, a transformer, and an N-fold voltage rectifier circuit, A high-voltage electrostatic field is formed between the first output terminal and the second output terminal of the rectifier circuit, and the filter of the pyroelectric infrared sensor is located in the high-voltage electrostatic field. Separated into positive ions and negative ions (ie electrons), the electrons encounter dust particles when they run towards the positive electrode of the high-voltage electrostatic field, and they will combine with the dust particles to make the dust particles negatively charged, so that they are adsorbed to the positive electrode of the high-voltage electrostatic field. It is collected to achieve the purpose of removing dust on the filter. After the dust outside the filter is removed, the detection sensitivity of the pyroelectric infrared sensor on the electronic device can be restored.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural diagram of a pyroelectric infrared sensor in the prior art;

2 is a schematic structural diagram of a high-voltage electrostatic dedusting system disclosed by the present utility model;

3 is a schematic structural diagram of still another high-voltage electrostatic dedusting system disclosed by the present utility model;

4 is a schematic diagram of a sine wave alternating current on a secondary winding of a transformer provided by the present invention;

5 is a schematic structural diagram of still another high-voltage electrostatic dedusting system disclosed by the present utility model;

FIG. 6 is a schematic structural diagram of another high-voltage electrostatic dedusting system disclosed by the present utility model.

Main device numbers:

DC power module 100, self-excited oscillation circuit 200, N-fold voltage rectification circuit 400, electronic device 500, pyroelectric infrared sensor 50, filter 5, primary winding N2, secondary winding N3, first rectifier diode VD1, first Two rectifier diodes VD2, third rectifier diode VD3, first filter capacitor C1, second filter capacitor C2, third filter capacitor C3, fourth rectifier diode VD4, fifth rectifier diode VD5, fourth filter capacitor C4, fifth filter Capacitor C5.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the implementations in this application, all other implementations obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

In addition, the descriptions of the following embodiments are made with reference to additional illustrations to illustrate specific embodiments that can be implemented by the present application. The directional terms mentioned in this application, for example, "up", "down", "front", "rear", "left", "right", "inside", "outside", "side", etc., are only It refers to the direction of the attached drawings. Therefore, the terminology used is to better and more clearly explain and understand the application, rather than to indicate or imply that the device or element referred to must have a specific orientation, a specific orientation Construction and operation are therefore not to be construed as limitations on the present application.

In the description of this application, it should be noted that the terms "installation", "connected", and "connected" should be understood in a broad sense, unless explicitly stated and limited otherwise. For example, they may be fixed connections or removable. Ground connection, or integral connection; it can be mechanical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

In addition, in the description of the present application, unless otherwise stated, "a plurality" means two or more. If the term "process" appears in this specification, it means not only an independent process, but when it cannot be clearly distinguished from other processes, it is also included in the term as long as the intended function of the process can be achieved. In addition, the numerical range indicated by "本" in this specification means the range which includes the numerical value described before and after "￣" as a minimum value and a maximum value, respectively. In the drawings, similar or identical units are denoted by the same reference numerals.

The terms "first", "second", and the like in the description and claims of the present application and the above-mentioned drawings are used to distinguish different objects, and are not used to describe a specific order. Furthermore, the terms "including" and "having", as well as any of them, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device containing a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.

The present application provides a high-voltage electrostatic dedusting system, which can solve the problem that the filter of a pyroelectric infrared sensor on an existing electronic device is prone to false alarms due to dust accumulation.

Please refer to FIG. 2, which is a schematic diagram of a high-voltage electrostatic dedusting system disclosed in an embodiment of the present application. The high-voltage electrostatic dedusting system is applied to an electronic device 500. The electronic device 500 here is any device provided with a pyroelectric infrared sensor 50. In the following description, a laser projector is used as the specific electronic device 500 for description; of course, the electronic device 500 may also be a light control setting using thermal radiation induction, a fire alarm that detects the position of a human body in far infrared, and the like. When the electronic device 500 is a laser projector, the pyroelectric infrared sensor 50 is usually located beside the lens of the laser projector. The pyroelectric infrared sensor 50 includes a filter 5, and of course, it also includes a Fresnel lens, a dual detection element, a field effect tube, and the like shown in FIG. 1. The high-voltage electrostatic dedusting system includes a DC power supply module 100, a self-excited oscillation circuit 200, a transformer T1, and an N-fold voltage rectification circuit 400, where N is an integer greater than or equal to two.

The DC power module 100 includes a positive terminal and a negative terminal, and the DC power module 100 is configured to output a DC voltage, for example, a DC voltage of 10V, 15V, or 20V. The voltage output by the DC power module 100 is mainly used to make the subsequent self-excited oscillation circuit 200, the transformer T1, and the N-times voltage rectification circuit 400 work. The transformer T1 includes a primary winding N2 and a secondary winding N3, and of course, an iron core (not shown in the figure). The primary winding N2 and the secondary winding N3 are both wound on the core. The self-excited oscillation circuit 200 and the primary winding N2 are connected in series between the positive terminal and the negative terminal of the DC power supply module 100 in sequence. The first terminal of the secondary winding N3 is connected to the N-times voltage. A first input terminal I1 of the rectifier circuit 400 and a second terminal of the secondary winding N3 are connected to the second input terminal I2 of the N-times voltage rectifier circuit 400.

The self-excited oscillation circuit 200 is configured to convert a DC voltage output from the DC power module 100 into a first AC voltage, and load the first AC voltage between two ends of the primary winding N2 and pass through a transformer The role of T1 generates a second AC voltage between the first end and the second end of the secondary winding N3, and the second AC voltage is loaded on the first input terminal and the second input terminal of the N-times voltage rectification circuit 400 between. In this application, the first AC voltage across the primary winding N2 is referred to as e1 (effective value); the second AC voltage across the secondary winding N3 is referred to as e2 (effective value), and the maximum value is referred to as E _2M .

The N-fold voltage rectification circuit 400 is configured to convert the second AC voltage e2 into a DC high voltage to form a high-voltage electrostatic field between a first output terminal and a second output terminal of the N-fold voltage rectification circuit 400. The filter is in the high-voltage electrostatic field to remove dust on the filter. Wherein, after the function of the N-times voltage rectifying circuit 400, the value of the DC high voltage is close to N _{2 E2M} , that is,

Times e2.

Optionally, a conductive plate (which may be made of a conductive metal material) is connected to the first output terminal and the second output terminal of the N-times voltage rectification circuit, respectively, to serve as a positive electrode and a negative electrode of the generated high voltage electrostatic field.

In the present application, the self-excited oscillation circuit 200 can convert the DC voltage generated by the DC power module 100 into a sinusoidal AC with a certain frequency by self-excited oscillation without an external input signal. Thereafter, a first AC voltage e1 is applied to both ends of the primary winding N2 of the transformer T1, so that a second AC voltage e2 is generated between the first end and the second end of the secondary winding N3. In order to obtain a high-voltage electrostatic field in this application, obviously, the second AC voltage e2 is greater than the first AC voltage e1. If the turns ratio of the primary winding N2 and the secondary winding N3 is 1: M, then e2: e1 = M, and M is greater than 1. Optionally, M is an integer of 5-100. Further, M is an integer of 10-50.

The frequency of the first AC voltage can be controlled by adjusting parameters of the self-excited oscillation circuit 200. Optionally, the frequency of the first AC voltage is 5-20 kHz. Selectable is 10-18kHz. The higher the frequency of the first alternating current, the less damage the human body has.

In the high-voltage electrostatic dedusting system described in FIG. 2, the first output end of the N-times voltage rectification circuit 400 and A high-voltage electrostatic field is formed between the second output terminals. When the filter 5 of the pyroelectric infrared sensor 50 provided on the electronic device 500 (for example, a laser projector) is in the high-voltage electrostatic field, due to this area The air is separated into positive and negative ions (ie, electrons) by the high-voltage electrostatic field. When the electrons run toward the positive electrode of the high-voltage electrostatic field, they encounter dust particles and will combine with the dust particles to make the dust particles negatively charged and adsorbed. The positive electrode to the high-voltage electrostatic field is collected, thereby achieving the purpose of removing dust on the filter. When the dust outside the filter is removed, the detection sensitivity of the pyroelectric infrared sensor 50 will be restored; for a laser projector, it can be prevented from entering the eye protection mode by mistake.

Please refer to FIG. 3, which is a schematic diagram of another high-voltage electrostatic dedusting system disclosed in an embodiment of the present application.

As shown in FIG. 3, in this embodiment, the self-excited oscillation circuit 200 includes a first transistor Q1 (specifically, an inexpensive NPN transistor), a first inductor L1, and a first resistor R1. The base of the transistor Q1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the first inductor L1, and the other end of the first inductor L1 and the The collectors of the first triode Q1 are connected to the positive ends of the DC power module 100, respectively, and the emitter of the first triode Q1 is connected to the primary winding N2. The self-excited oscillation module can convert the DC voltage generated by the DC power supply module 100 into a high-frequency sinusoidal AC power by self-excited oscillation without an external input signal. When the first triode Q1 is turned on, the first AC voltage generated by the self-excited oscillation circuit 200 may be applied to both ends of the primary winding N2 to implement the power to the transformer T1.

Optionally, a second resistor R2 and a diode D1 connected in series are connected in parallel between the positive terminal and the negative terminal of the DC power module 100, and the anode of the diode D1 is connected to the DC power module 100. Positive end. In the present application, the presence of the second resistor R2 and the diode D1 can play a detection role to prevent the positive terminal and the negative terminal of the DC power module 100 from being connected to the self-excited oscillation circuit 200 in the reverse direction, which may affect The current in the primary winding N2 of the transformer T1 is described.

Further, a protection resistor Rp is connected in series between the positive terminal and the negative terminal of the DC power module 100, and one end of the protection resistor Rp is connected to the negative terminal of the DC power module 100, and the protection resistor The other ends of Rp are respectively connected to the second resistor R2 and the primary winding N2. The presence of the protection resistor Rp can prevent the DC power supply module 100, the diode D1, and the like from being damaged due to too much current passing through them.

In this embodiment, the N-times voltage rectification circuit 400 is a three-times voltage rectification circuit, that is, N = 3. The three-times voltage rectifier circuit 400 includes a first rectifier diode VD1, a second rectifier diode VD2, a third rectifier diode VD3, a first filter capacitor C1, a second filter capacitor C2, and a third filter capacitor C3.

Specifically, the anode of the first rectifier diode VD1 is connected to the first end of the secondary winding N3. As mentioned above, the first end of the secondary winding N3 is connected to the first end of the N-times voltage rectifier circuit 400. An input terminal I1, so the positive electrode of the first rectifier diode VD1 can be regarded as the first input terminal I1 of the N-times voltage rectifier circuit 400 here. The negative electrode of the first rectifier diode VD1 is connected to the positive electrode of the second rectifier diode VD2, and the negative electrode of the second rectifier diode VD2 is connected to the positive electrode of the third rectifier diode VD3. The positive electrode of the first filter capacitor C1 is connected to the negative electrode of the first rectifier diode VD1, the positive electrode of the second filter capacitor C2 is connected to the negative electrode of the second rectifier diode VD2, and the positive electrode of the third filter capacitor C3 is connected The negative electrode of the third rectifier diode VD3; the positive electrode of the third filter capacitor C3 (or the negative electrode of the third rectifier diode VD3) can be regarded as the first output terminal O1 of the N-times voltage rectifier circuit 400 . The negative terminal of the second filter capacitor C2 is connected to the first end of the secondary winding N3, and the negative terminals of the first filter capacitor C1 and the third filter capacitor C3 are respectively connected to the first terminal of the secondary winding N3. Two terminals. Since the second input terminal I2 of the N-times voltage rectifier circuit 400 mentioned above is connected to the second terminal of the secondary winding N3, the negative terminal of the first filter capacitor C1 can be regarded as the N-times. The second input terminal I2 of the voltage rectification circuit 400; the negative electrode of the third filter capacitor C3 can be regarded as the second output terminal O2 of the N-times voltage rectification circuit 400. That is, the second input terminal I2 and the second output terminal O2 of the N-times voltage rectification circuit 400 are connected together, and the two are equipotential.

As described above, the self-excited oscillation circuit 200 can generate a sinusoidal AC signal with a certain frequency. Accordingly, the second AC voltage e2 loaded between the first end and the second end of the secondary winding N3 also has a sinusoidal waveform. (See Figure 4). The working principle of the three-times voltage rectifier circuit 400 is as follows: When the first half cycle (x = 0 to π) is set, the polarity of e2 is positive, negative, and negative. Only the first rectifier diode VD1 is turned on. The filter capacitor C1 is charged to the peak voltage E _{2M of} e2; at the second half cycle (x = π ~ 2π), the polarity of e2 is positive and negative. The voltage E _2M on the first filter capacitor C1 and the secondary winding N3 are two. The second AC voltage e2 (the maximum value is E _2M ) at the terminal is added in series, the second rectifier diode VD2 is turned on, and the second filter capacitor C2 is charged to 2E _2M through VD2; and at the third half cycle (x = 2π ～ 3π) ), The polarity of e2 becomes up, down, and down again. At this time, the voltage 2E _2M on the second filter capacitor C2 is connected in series with the second AC voltage e2 (the maximum value is E _2M ) across the secondary winding N3, and the third rectification is performed. The diode VD3 is turned on, and the third filter capacitor C3 is charged to 3E _2M through VD3. After repeated charging in this way, the voltage on the third filter capacitor C3 is stabilized at about 3E _2M after a certain period of time, which is N times A three-fold rectified voltage is obtained between the first output terminal O1 and the second output terminal O2 of the voltage rectification circuit 400 (

E2), forming a high-voltage electrostatic field. At this time, the voltage of the first output terminal O1 of the N-times voltage rectification circuit 400 is higher than the voltage of the second output terminal O2, that is, the first output terminal O1 is connected to the positive electrode of the high-voltage electrostatic field. When the filter 5 on the electronic device is in the high-voltage electrostatic field, dust on the filter 5 can be removed by electrostatic dust removal.

It can be known from the above analysis that the implementation of the high-voltage electrostatic dedusting system described in FIG. 3 of the present application can solve the problem of false alarms caused by the accumulation of dust on the filter of the pyroelectric infrared sensor on the electronic device. In addition, in other embodiments of the present application, the circuit structure of the three-times voltage rectifier circuit may be different from the structure in FIG. 3 above, but as long as the similar function can be achieved.

Please refer to FIG. 5, which is a schematic diagram of another high-voltage electrostatic dedusting system disclosed in an embodiment of the present application. The overall structure and composition of the high-voltage electrostatic dedusting system shown in this embodiment is substantially the same as that of the high-voltage electrostatic dedusting system shown in FIG. 3. For details, refer to the description of FIG. 3 in the foregoing embodiment, and details are not described herein again.

Further, the difference is that, in the high-voltage electrostatic dedusting system shown in FIG. 5, the self-excited oscillation circuit 200 includes a first transistor Q1 (specifically, a low-cost NPN-type transistor), a first inductor L1, and a first inductor. A resistor R1 and a first capacitor C6, the base of the first transistor Q1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to one end of the first inductor L1 The other end of the first inductor L1 and the collector of the first transistor Q1 are respectively connected to the positive end of the DC power module 100, and the first capacitor C6 is connected in parallel to the DC power module 100 Between the positive end of the first transistor and the base of the first transistor Q1, the emitter of the first transistor Q1 is connected to the primary winding N2.

In this embodiment, the self-excited oscillation circuit 200 is an LC oscillating circuit, which can generate a sine wave alternating current with a very high frequency. Accordingly, the frequency of the second AC voltage e2 is also higher, and the harm to the human body is less, such as the frequency Up to 10-20kHz. When the first triode Q1 is turned on, a first AC voltage generated by the self-excited oscillation circuit 200 may be applied to both ends of the primary winding N2 to implement power to the transformer T1.

Similarly, the implementation of the high-voltage electrostatic dedusting system described in FIG. 5 of this application can solve the false alarm of the human body induction system caused by the accumulation of dust in the filter of the pyroelectric infrared sensor on the existing electronic device (such as a laser projector). The problem.

Please refer to FIG. 6, which is a schematic diagram of another high-voltage electrostatic dedusting system disclosed in an embodiment of the present application. The overall structure and composition of the high-voltage electrostatic dedusting system shown in this embodiment is substantially the same as that of the high-voltage electrostatic dedusting system shown in FIG. 5. For details, please refer to the description of FIG. 3 and FIG. 5 in the foregoing embodiment, and details are not described herein again.

Further, the difference includes that, in the high-voltage electrostatic dedusting system shown in FIG. 6, a protection resistor Rp is further connected in series between the positive terminal and the negative terminal of the DC power supply module 100. An input terminal 201 of the self-excited oscillation circuit 200 is connected to the positive terminal, and an output terminal 202 of the self-excited oscillation circuit 200 is connected to the primary winding N2. One end of the protection resistor Rp is connected to the positive end of the DC power module 100, and the other ends of the protection resistor Rp are respectively connected to the anode of the diode D1 and the input terminal 201 of the self-excited oscillation circuit 200. The presence of the protection resistor Rp can prevent the DC power supply module 100, the diode D1, and the like from being damaged due to too much current passing through them.

Further, the difference further includes that in the high-voltage electrostatic dedusting system shown in FIG. 6, the N-voltage rectification circuit 400 is a double-voltage rectification circuit, that is, N = 2.

Specifically, the N-fold voltage rectifier circuit 400 includes a fourth rectifier diode VD4, a fifth rectifier diode VD5, a fourth filter capacitor C4, and a fifth filter capacitor C5. The positive terminal of the fourth filter capacitor C4 is connected to the first terminal of the secondary winding N3. As mentioned above, the first terminal of the secondary winding N3 is connected to the first input terminal of the N-times voltage rectification circuit 400. I1. Therefore, the positive electrode of the fourth filter capacitor C4 can be regarded as the first input terminal I1 of the N-times voltage rectification circuit 400. The negative electrode of the fourth filter capacitor C4 is connected to the positive electrode of the fourth rectifier diode VD4 and the negative electrode of the fifth rectifier diode VD5, and the positive electrode of the fifth rectifier diode VD5 is connected to the negative electrode of the fifth filter capacitor C5. Here, the negative electrode of the fifth filter capacitor C5 (or the positive electrode of the fifth rectifier diode VD5) can be regarded as the first output terminal O1 of the N-times voltage rectifier circuit 400. The negative electrode of the fourth rectifier diode VD4 and the positive electrode of the fifth filter capacitor C5 are respectively connected to the second end of the secondary winding N3; as mentioned above, the second input of the N-fold voltage rectifier circuit 400 is mentioned Terminal I2 is connected to the second terminal of the secondary winding N3. Here, the anode of the fourth rectifier diode VD4 can be regarded as the second input terminal I2 of the N-times voltage rectifier circuit 400; the anode of the fifth filter capacitor C5 can be regarded as Considered as the second output terminal O2 of the N-times voltage rectification circuit 400. That is, the second input terminal I2 and the second output terminal O2 of the N-times voltage rectification circuit 400 are connected together, and the two are equipotential.

As described above, the self-excited oscillation circuit 200 can generate a sinusoidal AC signal with a certain frequency. Accordingly, the second AC voltage e2 loaded between the first end and the second end of the secondary winding N3 also has a sinusoidal waveform. (See Figure 4). The working principle of this double-voltage rectifier circuit is as follows: When the first half cycle (x = 0 to π) is set, the polarity of e2 is positive, negative and negative, only the fourth rectifier diode VD4 is turned on, and the current passes through VD1 to the fourth Filter capacitor C4 is charged to the peak voltage of e2

And remains basically unchanged; at the second half cycle (x = π ~ 2π), the polarity of e2 is positive, negative, positive, negative, and the fifth rectifier diode VD5 is turned on. At this time, the voltage E _2M on the fourth filter capacitor C4 It is added in series with the second AC voltage e2 (the maximum value is E _2M ) across the secondary winding N3, and the current is charged to the fifth filter capacitor C5 through VD5, and the charging voltage is 2E _2M ; , The voltage on the fifth filter capacitor C5 is stabilized at about 2E _2M , so that a double-voltage rectified voltage is obtained between the first output terminal O1 and the second output terminal O2 of the N-fold voltage rectification circuit 400.

A high-voltage electrostatic field is formed. At this time, the voltage O2 of the second output terminal O2 of the N-times voltage rectification circuit 400 is higher than the voltage of the first output terminal O1, that is, the second output terminal O2 is connected to the positive electrode of the high-voltage electrostatic field. When the filter 5 of the electronic device (such as a laser projector) is in the high-voltage electrostatic field, the dust on the filter 5 can be removed by electrostatic dust removal.

Similarly, the implementation of the high-voltage electrostatic dedusting system described in FIG. 6 of this application can solve the false alarm of the human induction system caused by the accumulation of dust in the filter of the pyroelectric infrared sensor on the existing electronic device (such as a laser projector). problem.

The present application also provides an electronic device including a high-voltage electrostatic dedusting system as described in any one of FIGS. 2 to 6. I will not repeat them here.

The high-voltage electrostatic dedusting system and electronic device provided in this application have been described in detail above. Specific examples are used in this article to explain the principle and implementation of this application. The description of the above embodiments is only to help understand the method of this application. And its core ideas; at the same time, for those of ordinary skill in the art, according to the ideas of this application, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be interpreted as an application to this application. limits.

Claims

A high-voltage electrostatic dedusting system, characterized in that the high-voltage electrostatic dedusting system is applied to an electronic device provided with a pyroelectric infrared sensor, the pyroelectric infrared sensor includes a filter, and the high-voltage electrostatic dedusting system includes a direct current. A power supply module, a self-excited oscillation circuit, a transformer, and an N-voltage rectifier circuit, wherein the DC power supply module includes a positive terminal and a negative terminal, and the DC power supply module is used to output a DC voltage, and the transformer includes a primary winding and a secondary winding; Secondary winding, N is an integer greater than or equal to 2; the self-excited oscillation circuit and the primary winding are connected in series between the positive terminal and the negative terminal; the first end of the secondary winding is connected to the The first input terminal of the N-fold voltage rectifier circuit, and the second end of the secondary winding connected to the second input end of the N-fold voltage rectifier circuit;

The self-excited oscillation circuit is configured to convert a DC voltage output by the DC power module into a first AC voltage, and load the first AC voltage between two ends of the primary winding, and the secondary winding A second AC voltage generated between the first terminal and the second terminal is loaded between the first input terminal and the second input terminal of the N-times voltage rectification circuit, and the N-times voltage rectification circuit is configured to apply the The second AC voltage is converted into a DC high voltage to form a high-voltage electrostatic field between the first output terminal and the second output terminal of the N-times voltage rectification circuit, and the filter is in the high-voltage electrostatic field.
The high-voltage electrostatic dedusting system according to claim 1, wherein the N is 3, and the N-time voltage rectification circuit includes a first rectifier diode, a second rectifier diode, a third rectifier diode, and a first filter. A capacitor, a second filter capacitor, and a third filter capacitor;

The anode of the first rectifier diode is connected to the first end of the secondary winding, and the anode of the first rectifier tube is the first input end of the N-times voltage rectifier circuit; the anode of the first rectifier diode is connected An anode of the second rectifier diode, and a cathode of the second rectifier diode is connected to an anode of the third rectifier diode;

The positive electrode of the first filter capacitor is connected to the negative electrode of the first rectifier diode, the positive electrode of the second filter capacitor is connected to the negative electrode of the second rectifier diode, and the positive electrode of the third filter capacitor is connected to the third rectifier. The anode of the diode, and the anode of the third filter capacitor is the first output terminal of the N-fold voltage rectifier circuit; the anode of the second filter capacitor is connected to the first terminal of the secondary winding, and the first filter The negative electrode of the capacitor and the third filter capacitor are respectively connected to the second end of the secondary winding, and the negative electrode of the first filter capacitor is the second input terminal of the N-times voltage rectification circuit; the third filter The negative electrode of the capacitor is the second output terminal of the N-times voltage rectifier circuit.
The high-voltage electrostatic dedusting system according to claim 1, wherein the N is 2, and the N-times voltage rectification circuit includes a fourth rectifier diode, a fifth rectifier diode, a fourth filter capacitor, and a fifth filter. capacitance;

The positive terminal of the fourth filter capacitor is connected to the first end of the secondary winding, and the positive terminal of the fourth filter capacitor is the first input terminal of the N-times voltage rectification circuit; the negative terminals of the fourth filter capacitor are respectively The anode of the fourth rectifier diode is connected to the anode of the fifth rectifier diode, the anode of the fifth rectifier diode is connected to the anode of the fifth filter capacitor, and the anode of the fifth filter capacitor is N times the The first output terminal of the voltage rectifier circuit; the negative electrode of the fourth rectifier diode and the positive electrode of the fifth filter capacitor are respectively connected to the second end of the secondary winding, and the negative electrode of the fourth rectifier diode is the The second input terminal of the N-fold voltage rectifier circuit; the positive electrode of the fifth filter capacitor is the second output terminal of the N-fold voltage rectifier circuit.
The high-voltage electrostatic dedusting system according to claim 1, wherein the self-excited oscillation circuit includes a first triode, a first inductor, and a first resistor, and a base stage of the first triode and the One end of the first resistor is connected, the other end of the first resistor is connected to one end of the first inductor, and the other end of the first inductor and the collector of the first triode are connected to the first electrode respectively. The positive end of the DC power module, the emitter of the first triode is connected to the primary winding; the self-excited oscillation module is used to connect the first alternating current when the first triode is on A voltage is applied between the two ends of the primary winding.
The high-voltage electrostatic dedusting system according to claim 1, wherein the self-excited oscillation circuit comprises a first triode, a first inductor, a first resistor, and a first capacitor, and a base of the first triode The stage is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the first inductor, and the other end of the first inductor and the collector of the first transistor are respectively Connected to the positive end of the DC power module, the first capacitor is connected in parallel between the positive end of the DC power module and the base of the first transistor, and the emitter of the first transistor Connected to the primary winding; the self-excited oscillation module is configured to load the first AC voltage between two ends of the primary winding when the first triode is turned on.
The high-voltage electrostatic dedusting system according to any one of claims 1 to 5, wherein a second resistor and a diode connected in series in series are further connected in parallel between the positive terminal and the negative terminal of the DC power module, and The anode of the diode is connected to the positive end of the DC power module.
The high-voltage electrostatic dedusting system according to claim 6, wherein an input terminal of the self-excited oscillation circuit is connected to the positive terminal, and an output terminal of the self-excited oscillation circuit is connected to the primary winding; A protection resistor is also connected in series between the positive terminal of the power module and the negative terminal,

Wherein, one end of the protection resistor is connected to the positive terminal, and the other end of the protection resistor is respectively connected to the anode of the diode and the input terminal of the self-excited oscillation circuit; or, one end of the protection resistor is connected to the The negative terminal, the other end of the protection resistor is connected to the second resistor and the primary winding, respectively.
The high-voltage electrostatic dedusting system according to claim 1, wherein the frequency of the first AC voltage is 5-20 kHz.
The high-voltage electrostatic dedusting system according to claim 1, wherein a conductive plate is connected to the first output terminal and the second output terminal of the N-times voltage rectification circuit, respectively.
An electronic device, comprising the high-voltage electrostatic dedusting system according to any one of claims 1-9.