Electromagnetic rapping drive circuit of dust remover
By distinguishing the positive and negative half-period of the AC power supply in the electro-dust collector and generating only the trigger current in the positive half-period, the problems of high power consumption of Thyristor and large isolation transformer in traditional electro-dust collectors are solved, and a more efficient and reliable electromagnetic vibration driving circuit is achieved.
Patent Information
- Application Number
- CN202421814183.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-30
AI Technical Summary
In existing electro-dust collectors, the traditional thyristor trigger isolation method generates a trigger signal in every half cycle of AC power, resulting in an increase in power consumption of the thyristor, and the isolation transformer is large in size and has high power requirements.
By distinguishing between the positive and negative half cycles of the AC power supply, a trigger current is generated only when the positive half cycle of the AC power supply is used, and the thyristor trigger current is used in the pulsed form, reducing the power consumption on the thyristor and reducing the power and volume of the isolation transformer.
It realizes reducing the power consumption of thyristors, reducing the power and volume of the isolation transformer, and improving the reliability of overall performance.
Smart Images
Figure CN223010789U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an electromagnetic vibration driving circuit for a dust collector, belonging to the technical field of electrostatic precipitators. Background Art
[0002] An electrostatic precipitator is a device for treating air dust pollution. The supporting vibration system can keep the dust removal effect of the dust collector in a good state by regularly cleaning the dust adsorbed on the electrostatic precipitator plates.
[0003] Electromagnetic vibration is one of the vibration types of the dust collector and is widely used in electrostatic precipitators. Electromagnetic vibration generally adopts a matrix layout, controlled by rows and columns. Thyristors are used to control the gating of rows and columns. Each vibrator is connected across the row selection line and the column selection line. Only one vibrator can be put into operation at any time.
[0004] A thyristor is a unidirectional conduction device that only allows the current in the positive half cycle to pass through in an AC circuit, thus forming a DC pulse current. The working principle of the vibrator is that when the coil passes through the DC pulse current, the coil generates a magnetic stress to lift the vibration hammer, and the vibration hammer freely falls to strike the anvil when the coil is powered off. The vibrator is an inductive load. When the thyristor drives an inductive load, the trigger pulse needs to have sufficient current intensity and width. The row and column thyristors are used in series in the matrix, and their cathodes are not at the same potential. Therefore, the thyristor trigger needs to adopt an isolation method.
[0005] The commonly used thyristor trigger isolation method generally adopts transformer isolation. The traditional method does not distinguish between the positive and negative half cycles of the alternating current, and thyristor trigger signals will be generated in each half cycle of the alternating current. However, the trigger signals in the negative half cycle do not work, which increases the power consumption on the thyristor. Moreover, in order to ensure that there is sufficient trigger current in each half cycle of the alternating current, the transformer has a high power requirement and a large volume. Content of the Utility Model
[0006] The purpose of the utility model is to provide an electromagnetic vibration driving circuit for a dust collector aiming at the defects or deficiencies in the prior art. By distinguishing between the positive and negative half cycles of the AC power supply, trigger current is generated only in the positive half cycle of the alternating current. The thyristor trigger current is in the form of a pulse, which reduces the power consumption on the thyristor, reduces the power and volume of the isolation transformer, and makes the overall performance more reliable.
[0007] To achieve the above purpose, the utility model adopts the following technical solutions: It includes a trigger pulse generation circuit 1, a row selection thyristor trigger circuit 2, a column selection thyristor trigger circuit 3, and a thyristor 4. The trigger pulse generation circuit 1 is connected to the row selection thyristor trigger circuit 2 and the column selection thyristor trigger circuit 3. The row selection thyristor trigger circuit 2 and the column selection thyristor trigger circuit 3 are connected to the thyristor 4.
[0008] Further, the thyristor 4 includes a row selection thyristor SCR1 and a column selection thyristor SCR2. The anodes of all row selection thyristors SCR1 are connected in parallel and then connected to the A end of the AC power supply, and the cathodes of all column selection thyristors SCR2 are connected in parallel and then connected to the B end of the AC power supply.
[0009] Further, the trigger pulse generation circuit 1 includes a DC power supply VCC, a transformer T1, an optocoupler U1, a control signal switch K1, a triode Q1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, and a resistor R5. The input terminal 1 and the output terminal 3 of the transformer T1 are the same-name terminals. The input terminal 1 of the transformer T1 is connected to the A end of the AC power supply, and the input terminal 2 of the transformer T1 is connected to the B end of the AC power supply. The output terminal 3 of the transformer T1 is connected to the positive pole of the input of the optocoupler U1 through a current-limiting resistor R1. The negative input of the optocoupler U1 is connected to the output terminal 4 of the transformer T1. The DC power supply VCC is connected to the E pole of the PNP triode Q1. A path is formed from the DC power supply VCC through the resistor R3, the capacitor C1, the resistor R2, the output terminal of the optocoupler U1, the control signal switch K1 and then to the VCC power ground. A resistor R4 is connected in parallel at both ends of the capacitor C1. The connection point of the resistor R3 and the capacitor C1 is connected to the B pole of the triode Q1 through a resistor R5.
[0010] Further, the row selection thyristor trigger circuit 2 includes a transformer T2, a unidirectional diode D1, a trigger capacitor C2, a low-power thyristor Q2, an optocoupler U2, a resistor R6, a resistor R7, and a resistor R8. The input terminal 1 and the output terminal 3 of the transformer T2 are the same-name terminals. The input terminal 1 of the transformer T2 is connected to the A end of the AC power supply, and the input terminal 2 of the transformer T2 is connected to the B end of the AC power supply. The output terminal 4 of the transformer T2 is connected to a current-limiting resistor R6. The other end of the resistor R6 is connected to the positive pole of the diode D1. The negative pole of D1 is connected in parallel with the C pole of the output terminal of the optocoupler U2, the upper end of the capacitor C2, and the MT2 end of the low-power thyristor Q2. The E pole of the output terminal of the optocoupler U2 is connected to the control pole of Q2. A resistor R8 is connected in parallel between the control pole and the MT1 pole of Q2. The MT1 pole of Q2 is connected to the control pole of the row selection thyristor SCR1. The cathode of the row selection thyristor SCR1 is connected in parallel with the lower end of the capacitor C2 and the output terminal 3 of the transformer T2. The positive pole of the input of the optocoupler U2 is connected to a resistor R7. The other end of the resistor R7 is connected to the C pole of Q1. The negative pole of the input of the optocoupler U2 is connected to the DC power ground.
[0011] Further, the column selection thyristor trigger circuit 3 is the same as the row selection thyristor trigger circuit 2.
[0012] After adopting the above technical solution, the beneficial effects of the present utility model are as follows: By distinguishing the positive and negative half-cycles of the AC power supply, the trigger current is generated only during the positive half-cycle of the alternating current. The thyristor trigger current is in the form of a pulse, reducing the power consumption on the thyristor, reducing the power and volume of the isolation transformer, and making the overall performance more reliable. Description of the Drawings
[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0014] Figure 1 It is a schematic diagram of the circuit principle of the present invention.
[0015] Explanation of reference numerals in the drawings: trigger pulse generation circuit 1, row selection thyristor trigger circuit 2, column selection thyristor trigger circuit 3, thyristor 4. Specific embodiments
[0016] Refer to Figure 1 As shown, the technical solution adopted in this specific embodiment is as follows: It includes a trigger pulse generation circuit 1, a row selection thyristor trigger circuit 2, a column selection thyristor trigger circuit 3, and a thyristor 4. The trigger pulse generation circuit 1 is connected to the row selection thyristor trigger circuit 2 and the column selection thyristor trigger circuit 3. The row selection thyristor trigger circuit 2 and the column selection thyristor trigger circuit 3 are connected to the thyristor 4. In this embodiment, only a single loop is described for illustration. The actual number of loops is determined according to the number of row selections and column selections. The trigger pulse generation circuit distinguishes between the positive and negative half-cycles of the AC power supply and only generates a trigger current during the positive half-cycle of the alternating current. The thyristor trigger current is in the form of a pulse, reducing the power consumption on the thyristor and enabling the circuit to work in each AC cycle. The row selection thyristor trigger circuit and the column selection thyristor trigger circuit only discharge the capacitor during the positive half-cycle of the alternating current and slowly charge the capacitor during the negative half-cycle of the alternating current. The charging current is small, reducing the power and volume of the isolation transformer and making the overall performance more stable.
[0017] More specifically, the thyristor 4 includes a row selection thyristor SCR1 and a column selection thyristor SCR2. The anodes of all row selection thyristors SCR1 are connected in parallel and then connected to the A terminal of the AC power supply. The cathodes of all column selection thyristors SCR2 are connected in parallel and then connected to the B terminal of the AC power supply. The cathode of the row selection thyristor and the anode of the column selection thyristor are used to connect the vibrator coil across. The actual number of row selection thyristors is determined according to the number of row selections, and the number of column selection thyristors is determined according to the number of column selections.
[0018] More specifically, the trigger pulse generation circuit 1 includes a DC power supply VCC, a transformer T1, an optocoupler U1, a control signal switch K1, a triode Q1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3, and a resistor R5. The input terminal 1 and the output terminal 3 of the transformer T1 are the same-name terminals. The input terminal 1 of the transformer T1 is connected to the A terminal of the AC power supply, and the input terminal 2 of the transformer T1 is connected to the B terminal of the AC power supply. The output terminal 3 of the transformer T1 is connected to the positive electrode of the input of the optocoupler U1 through a current-limiting resistor R1, and the negative electrode of the input of the optocoupler U1 is connected to the output terminal 4 of the transformer T1. In this embodiment, by using the unidirectional conduction characteristic of the optocoupler input, the output of the optocoupler U1 functions to conduct during the positive half-cycle of the alternating current and turn off during the negative half-cycle.
[0019] The DC power supply VCC is connected to the E electrode of the PNP triode Q1. A path is formed from the DC power supply VCC through the resistor R3, the capacitor C1, the resistor R2, the output terminal of the optocoupler U1, and the control signal switch K1 to the VCC power ground in sequence. A resistor R4 is connected in parallel across both ends of the capacitor C1, and the connection point of the resistor R3 and the capacitor C1 is connected to the B electrode of the triode Q1 through a resistor R5.
[0020] During the negative half-cycle of the alternating current, the output of the optocoupler U1 is disconnected, the potential of the B electrode of the triode Q1 is the DC power supply VCC, the triode Q1 is cut off, and there is no output at the C electrode. During the positive half-cycle of the alternating current, the output of the optocoupler U1 is turned on. At the moment when the control signal switch K1 is closed, a current is generated from the DC power supply VCC through the R3, C1, R2, the output terminal of the optocoupler U1, and the control signal switch K1 to the DC power ground. This current generates a voltage drop across the resistor R3, causing the triode Q1 to be saturated and conducting. The DC power supply VCC outputs through the C electrode of the triode Q1. Since the capacitor C1 is very small, after a short period of time, the capacitor C1 is fully charged, the voltage drop across the R3 disappears, and the triode Q1 turns off, and the output of the DC power supply VCC to the outside is disconnected. It can be seen that the output of the DC power supply VCC through the triode Q1 is short-lived and only occurs at the moment when the output of the optocoupler U1 is turned on and the controllable switch K1 is closed. When the AC power supply is in the negative half-cycle, the charge on the capacitor C1 is released through the resistor R4 within half an AC cycle. When the next positive half-cycle of the alternating current comes, the capacitor C1 can repeat the charging process, enabling the circuit to work in each AC cycle.
[0021] More specifically, the row-select thyristor trigger circuit 2 includes a transformer T2, a unidirectional diode D1, a trigger capacitor C2, a low-power thyristor Q2, an optocoupler U2, a resistor R6, a resistor R7, and a resistor R8. The input terminal 1 and the output terminal 3 of the transformer T2 are the same-name terminals. The input terminal 1 of the transformer T2 is connected to the A terminal of the AC power supply, the input terminal 2 of the transformer T2 is connected to the B terminal of the AC power supply, the output terminal 4 of the transformer T2 is connected to the current-limiting resistor R6, the other end of the resistor R6 is connected to the positive electrode of the diode D1, the negative electrode of D1 is connected in parallel with the C electrode of the output terminal of the optocoupler U2, the upper end of the capacitor C2, and the MT2 terminal of the low-power thyristor Q2. The E electrode of the output terminal of the optocoupler U2 is connected to the control electrode of Q2. A resistor R8 is connected in parallel between the control electrode and the MT1 electrode of Q2. The MT1 electrode of Q2 is connected to the control electrode of the row-select thyristor SCR1. The cathode of the row-select thyristor SCR1 is connected in parallel with the lower end of the capacitor C2 and the output terminal 3 of the transformer T2. The positive electrode of the input terminal of the optocoupler U2 is connected to the resistor R7, the other end of the resistor R7 is connected to the C electrode of Q1, and the negative electrode of the input terminal of the optocoupler U2 is connected to the ground of the DC power supply;
[0022] During the negative half-cycle of the alternating current, since the triode Q1 is cut off, the optocoupler U2 has no input and the output is disconnected. The low-power thyristor Q2 is cut off. The output of the transformer T2 charges the trigger capacitor C2 through the current-limiting resistor R6 and the diode D1. Since there is the charging time of the entire negative half-cycle of the alternating current, the charging current is very small, and the power of the transformer T2 can be made very small. During the positive half-cycle of the alternating current, if the control signal switch K1 is closed, at the moment of closing, the DC power supply VCC outputs through the C electrode of Q1, enabling the output of the optocoupler U2 to turn on. The capacitor C2 discharges through the output of the optocoupler U2, the resistor R8, and the control electrode of the thyristor SCR1. The current generated produces a voltage drop across R8, and this voltage drop triggers the low-power thyristor Q2 to conduct. After Q2 conducts, the capacitor C2 quickly discharges through Q2 to the control electrode of the thyristor SCR1. This discharge current is relatively large, triggering SCR1 to conduct quickly. When the discharge of the capacitor C2 ends, the thyristor SCR1 maintains conduction until the end of the positive half-cycle of the alternating current.
[0023] More specifically, the column-select thyristor trigger circuit 3 is the same as the row-select thyristor trigger circuit 2.
[0024] Working principle of the present utility model: During the negative half-cycle of the alternating current, the output of optocoupler U1 is disconnected. The potential of the base of triode Q1 is the DC power supply VCC, and triode Q1 is cut off, with no output at the collector. During the positive half-cycle of the alternating current, the output of optocoupler U1 is turned on. At the moment when the control signal switch K1 is closed, a current is generated from the DC power supply VCC through R3, C1, R2, the output terminal of optocoupler U1, and the control signal switch K1 to the DC power supply ground. This current generates a voltage drop across resistor R3, causing triode Q1 to be saturated and conducting. The DC power supply VCC outputs through the collector of triode Q1. Since capacitor C1 is very small, after a short period of time, capacitor C1 is fully charged, the voltage drop across R3 disappears, and triode Q1 turns off, disconnecting the output of the DC power supply VCC to the outside. Thus, it can be seen that the output of the DC power supply VCC through triode Q1 is short-lived and only occurs at the moment when the output of optocoupler U1 is turned on and the controllable switch K1 is closed. When the AC power supply is in the negative half-cycle, the charge on capacitor C1 is discharged through resistor R4 within half an AC cycle. When the next positive half-cycle of the alternating current comes, capacitor C1 can repeat the charging process, enabling this circuit to work in each AC cycle. During the negative half-cycle of the alternating current, since triode Q1 is cut off, optocoupler U2 has no input and its output is disconnected. The small-power thyristor Q2 is cut off, and the output of transformer T2 charges the trigger capacitor C2 through the current-limiting resistor R6 and diode D1. Due to the entire charging time of the negative half-cycle of the alternating current, the charging current is very small, and the power of transformer T2 can be made very small. During the positive half-cycle of the alternating current, if the control signal switch K1 is closed, at the moment of closing, the DC power supply VCC outputs through the collector of Q1, causing the output of optocoupler U2 to be turned on. Capacitor C2 discharges through the output of optocoupler U2, resistor R8, and the control electrode of thyristor SCR1, generating a voltage drop across R8. This voltage drop triggers the small-power thyristor Q2 to conduct. After Q2 conducts, capacitor C2 quickly discharges through Q2 to the control electrode of thyristor SCR1. This discharge current is relatively large, triggering SCR1 to conduct quickly. When capacitor C2 finishes discharging, thyristor SCR1 maintains conduction until the end of the positive half-cycle of the alternating current.
[0025] The above is only used to illustrate the technical solution of the present utility model and not to limit it. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present utility model, as long as they do not depart from the spirit and scope of the technical solution of the present utility model, shall be covered within the scope of the claims of the present utility model.
Claims
1. A dust collector electromagnetic vibration drive circuit, characterized in that: It comprises a trigger pulse generating circuit (1), a row-selected thyristor trigger circuit (2), a column-selected thyristor trigger circuit (3), and a thyristor (4). The trigger pulse generating circuit (1) is connected to the row-selected thyristor trigger circuit (2) and the column-selected thyristor trigger circuit (3), and the row-selected thyristor trigger circuit (2) and the column-selected thyristor trigger circuit (3) are connected to the thyristor (4).
2. The electromagnetic vibration driving circuit of a dust collector according to claim 1, characterized in that: The thyristors (4) include row-selected thyristors SCR1 and column-selected thyristors SCR2. The anodes of all row-selected thyristors SCR1 are connected in parallel and connected to the A terminal of the AC power supply. The cathodes of all column-selected thyristors SCR2 are connected in parallel and connected to the B terminal of the AC power supply.
3. The electromagnetic vibration driving circuit of a dust collector according to claim 1, characterized in that: The trigger pulse generating circuit (1) comprises a DC power supply VCC, a transformer T1, an optical coupler U1, a control signal switch K1, a transistor Q1, a capacitor C1, a resistor R1, a resistor R2, a resistor R3 and a resistor R5. The input terminal 1 and the output terminal 3 of the transformer T1 are the same terminals. The input terminal 1 of the transformer T1 is connected to the A terminal of the AC power supply, and the input terminal 2 of the transformer T1 is connected to the B terminal of the AC power supply. The output terminal 3 of the transformer T1 is connected to the positive electrode of the optical coupler U1 input through the current limiting resistor R1, and the negative electrode of the optical coupler U1 is connected to the output terminal 4 of the transformer T1. The DC power supply VCC is connected to the E pole of the PNP transistor Q1. A path is formed from the DC power supply VCC through the resistor R3, the capacitor C1, the resistor R2, the output terminal of the optical coupler U1, the control signal switch K1, and then to the VCC power supply ground. The two ends of the capacitor C1 are connected in parallel with a resistor R4. The connection point between the resistor R3 and the capacitor C1 is connected to the B pole of the transistor Q1 through the resistor R5.
4. The electromagnetic vibration driving circuit for a dust collector according to claim 1, characterized in that: The row selection thyristor trigger circuit (2) comprises a transformer T2, a unidirectional diode D1, a trigger capacitor C2, a low-power thyristor Q2, an optical coupler U2, a resistor R6, a resistor R7 and a resistor R8. The input terminal 1 and the output terminal 3 of the transformer T2 are the same terminals. The input terminal 1 of the transformer T2 is connected to the A terminal of the AC power supply, the input terminal 2 of the transformer T2 is connected to the B terminal of the AC power supply, the output terminal 4 of the transformer T2 is connected to the current limiting resistor R6, the other end of the resistor R6 is connected to the positive electrode of the diode D1, and the negative electrode of D1 is connected to the output terminal of the optical coupler U2. The C terminal, the upper end of the capacitor C2, and the MT2 terminal of the low-power thyristor Q2 are connected in parallel, the E terminal of the optocoupler U2 is connected to the control terminal of Q2, a resistor R8 is connected in parallel between the control terminal of Q2 and the MT1 terminal, the MT1 terminal of Q2 is connected to the control terminal of the row-selected thyristor SCR1, the cathode of the row-selected thyristor SCR1 is connected in parallel with the lower end of the capacitor C2 and the output terminal 3 of the transformer T2, the positive terminal of the optocoupler U2 is connected to the resistor R7, the other end of the resistor R7 is connected to the C terminal of Q1, and the negative terminal of the optocoupler U2 is connected to the DC power supply ground.
5. The electromagnetic vibration driving circuit for a dust collector according to claim 1, characterized in that: The column-selected thyristor trigger circuit (3) is the same as the row-selected thyristor trigger circuit (2).