CN110930836A - Power electronic technology teaching experimental instrument - Google Patents
Power electronic technology teaching experimental instrument Download PDFInfo
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- CN110930836A CN110930836A CN201911126585.0A CN201911126585A CN110930836A CN 110930836 A CN110930836 A CN 110930836A CN 201911126585 A CN201911126585 A CN 201911126585A CN 110930836 A CN110930836 A CN 110930836A
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Abstract
The invention relates to a power electronic technology teaching experimental instrument, which comprises an AC-DC conversion circuit, a DC-DC conversion circuit and a DC-DC conversion circuit, wherein the AC-DC conversion circuit is used for converting 220V alternating current commercial power into 36V direct current; the DC-AC inverter circuit is used for inverting the 36V direct current output by the AC-DC conversion circuit into 36V alternating current and supplying the 36V alternating current to the controllable silicon and the load circuit; the 12V and 5V conversion circuit is used for converting the 36V direct current output by the AC-DC conversion circuit into 12V direct current and 5V direct current and providing the 12V direct current and the 5V direct current to the single chip microcomputer and the driving circuit; the single chip microcomputer and the driving circuit are used for controlling the conduction angles of the silicon controlled rectifier and the silicon controlled rectifier in the load circuit during the experiment of the thyristor rectifier circuit; the key display screen is used for adjusting and displaying the conduction angle of the controlled silicon and the controlled silicon in the load circuit. The invention provides safe alternating current working voltage for the silicon controlled rectifier and the load circuit; in addition, a trigger circuit which is controlled by a single chip microcomputer and has control angle display is adopted, the trigger angle control adopts a key mode, the angle display adopts liquid crystal display, and the control angle adjustment is convenient and visual.
Description
Technical Field
The invention relates to power electronic teaching equipment, in particular to a power electronic technology teaching experimental instrument.
Background
At present, most of power electronic experimental equipment used in domestic college laboratories is in a large-scale combined type experiment table form, such as products of companies like Tianhuang teaching instruments, Zheda Qii and the like, the price is high, the voltage is strong current of 380V, the experiment of students is dangerous, the power consumption is high, the work is not stable, the control angle of the silicon controlled rectifier is inconvenient to adjust in the experiment, and the observation is inconvenient.
Disclosure of Invention
The invention aims to provide a power electronic technology teaching experimental instrument which can improve the safety of experimental operation, save energy, is stable and is convenient to control and observe.
The technical scheme for solving the technical problems is as follows: a power electronic technology teaching experimental instrument comprises an AC-DC conversion circuit, a DC-AC inverter circuit, 12V and 5V conversion circuits, a single chip microcomputer and driving circuit, a silicon controlled rectifier and load circuit and a key display screen;
the AC-DC conversion circuit is used for converting 220V alternating current commercial power into 36V direct current;
the DC-AC inverter circuit is used for inverting the 36V direct current output by the AC-DC conversion circuit into 36V alternating current and providing the 36V alternating current to the silicon controlled rectifier and the load circuit;
the 12V and 5V conversion circuit is used for converting the 36V direct current output by the AC-DC conversion circuit into 12V direct current and 5V direct current and providing the 12V direct current and the 5V direct current to the single chip microcomputer and the driving circuit;
the single chip microcomputer and the driving circuit are used for controlling the conduction angle of the silicon controlled rectifier and the silicon controlled rectifier in the load circuit during the experiment of the thyristor rectifier circuit;
and the key display screen is used for adjusting and displaying the conduction angle of the controllable silicon and the controllable silicon in the load circuit.
The invention has the beneficial effects that: the power electronic technology teaching experimental instrument adopts the AC-DC conversion circuit and the 12V and 5V conversion circuit to convert the commercial power into the safe voltage to supply power to the singlechip and the driving circuit, so that the safety of experimental operation can be improved; the AC-DC conversion circuit and the DC-AC inverter circuit are matched to provide safe alternating voltage for the silicon controlled rectifier and the load circuit, so that the purposes of saving energy and improving stability can be realized while the safety of experimental operation is improved; the AC-DC conversion circuit and the DC-AC inverter circuit adopt a high-frequency switching power supply technology, so that the size can be reduced, and the miniaturization and portability of equipment can be realized; in addition, for the experiment of the thyristor rectification circuit part, a trigger circuit with control angle display and controlled by a single chip microcomputer is adopted, the trigger angle control adopts a key mode, the angle display adopts liquid crystal display, and the control angle is convenient and visual to adjust compared with the trigger circuit of an analog circuit.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the input end of the AC-DC conversion circuit is connected with a mains supply, and the output end of the AC-DC conversion circuit is respectively connected with the input end of the DC-AC inverter circuit and the input ends of the 12V and 5V conversion circuits; the output end of the DC-AC inverter circuit is connected to the power supply end of the silicon controlled rectifier and the load circuit, the output ends of the 12V and 5V conversion circuits are connected to the power supply ends of the single chip microcomputer and the drive circuit, and the control output ends of the single chip microcomputer and the drive circuit are connected to the control input ends of the silicon controlled rectifier and the load circuit; the key display screen is connected to the setting end and the display end of the single chip microcomputer and the driving circuit.
Further, the thyristor and load circuit comprises a unidirectional thyristor Q1 of a TYN1225 model and a pure resistance load R14; the anode of the unidirectional silicon controlled rectifier Q1 is connected to the anode of the output end of the DC-AC inverter circuit, and the cathode of the unidirectional silicon controlled rectifier Q1 is connected to the cathode of the output end of the DC-AC inverter circuit through the pure resistance load R14.
The beneficial effect of adopting the further scheme is that: the silicon controlled rectifier and the load circuit are designed and selected in a miniaturized manner, so that the cost can be saved, and the volume can be reduced.
Further, the single chip microcomputer and the driving circuit comprise a single chip microcomputer U1 and a driving circuit, wherein the single chip microcomputer U1 is specifically an STC89C52 type single chip microcomputer; the driving circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a triode Q6, a triode Q7, a triode Q8, a triode Q9, a pulse transformer T1, a capacitor C44, a capacitor 36, a diode D17 and a diode D16; one end of the resistor R5 is connected to a P20 pin of the single chip microcomputer U1, the other end of the resistor R5 is connected to a base of the transistor Q6, a collector of the transistor Q6 is connected to a 12V output end of the 12V and 5V conversion circuit through the resistor R6, an emitter of the transistor Q6 is grounded, a collector of the transistor Q6 is further connected to a base of the transistor Q7 and a base of the transistor Q8 through the resistor R7, a collector of the transistor Q7 is connected to a 12V output end of the 12V and 5V conversion circuit, a collector of the transistor Q8 is grounded, an emitter of the transistor Q7 and an emitter of the transistor Q8 are both connected to one end of a primary coil of the pulse transformer T1 through a capacitor C44, the other end of the primary coil of the pulse transformer T1 is grounded, and one end of a secondary coil of the pulse transformer T1 is connected to a negative electrode of the diode D17 through the resistor R8 The other end of the secondary winding of the pulse transformer T1 is connected to the anode of the diode D17 through the capacitor C36, the other end of the secondary coil of the pulse transformer T1 is also connected to the anode of the diode D17 through the resistor R9, the other end of the secondary coil of the pulse transformer T1 is also connected to the cathode of the diode D16, the anode of the diode D16 is connected to the anode of the diode D17 through the resistor R10, the base of the transistor Q9 is connected to the anode of the diode D17, the collector of the transistor Q9 is connected to the cathode of the diode D17, the emitter of the triode Q9 is connected to the anode of the diode D16, the collector of the triode Q9 is connected to the control electrode of the unidirectional thyristor Q1, and the emitter of the triode Q9 is connected to the cathode of the unidirectional thyristor Q1.
The beneficial effect of adopting the further scheme is that: the trigger pulse generating circuit controlled by the single chip microcomputer is manufactured by adopting a surface mount type original piece, so that the volume of the whole experimental equipment is further reduced.
Further, an alternating voltage zero crossing point signal extraction circuit is also arranged on the single chip microcomputer U1 and comprises an optocoupler U3, an optocoupler U4, a resistor R11, a resistor R22, a resistor R23 and a triode Q11; the emitting diode positive pole of opto-coupler U3 is connected on the positive pole of unidirectional silicon controlled rectifier Q1, the emitting diode negative pole of opto-coupler U3 is connected on the negative pole of unidirectional silicon controlled rectifier Q1, the emitting diode positive pole of opto-coupler U4 is connected on the negative pole of unidirectional silicon controlled rectifier Q1, the emitting diode negative pole of opto-coupler U4 is connected on the positive pole of unidirectional silicon controlled rectifier Q1, the collecting electrode of opto-coupler U3's phototriode is connected on triode Q11's base, the emitter ground of opto-coupler U3's phototriode, the collecting electrode of opto-coupler U4's phototriode is connected on triode Q11's base, the emitter ground of opto-coupler U4's phototriode, triode Q11's collecting electrode passes through resistance R23 connects the VCC, triode Q11's base passes through resistance R22 connects the VCC, triode Q11's emission ground, and the collector of the triode Q11 is connected with the P32/INT0 pin of the singlechip U1.
Further, the key circuit includes a key S1, a key S2, and a key S3; one end of the key S1 is grounded, the other end of the key S1 is connected to a P10 pin of the singlechip U1, and the other end of the key S1 is also connected to a voltage VCC through a resistor R1; one end of the key S2 is grounded, the other end of the key S2 is connected to a P11 pin of the singlechip U1, and the other end of the key S2 is also connected to a voltage VCC through a resistor R2; one end of the key S3 is grounded, the other end of the key S3 is connected to a P12 pin of the singlechip U1, and the other end of the key S3 is also connected to a voltage VCC through a resistor R3.
Further, the display screen is an LCD1602 liquid crystal display screen.
Further, the AC-DC conversion circuit is specifically an isolated flyback AC-DC power supply.
Further, the DC-AC inverter circuit is specifically an EG8010+ IR2110S + latching pure sine wave inverter.
Drawings
FIG. 1 is a schematic block diagram of a power electronic technology teaching experimental apparatus of the present invention;
FIG. 2-1 is a partial schematic diagram of a specific circuit structure of a power electronic technology teaching experimental apparatus according to the present invention;
FIG. 2-2 is a partial schematic diagram of a specific circuit structure of a power electronic technology teaching experimental apparatus according to the present invention;
FIG. 3 is a schematic diagram of the circuit structure of the AC-DC converting circuit;
FIG. 4 is a schematic diagram of a circuit structure of the DC-AC inverter circuit;
FIG. 5 is a waveform diagram of an AC zero crossing signal generated in a power electronics teaching experiment apparatus according to the present invention;
FIG. 6 is a control flow chart of the one-way thyristor controlled by the single chip microcomputer;
fig. 7 is a timing diagram of the 220V ac main power supply on interval, the synchronization signal and the trigger signal.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a power electronic technology teaching experimental apparatus comprises an AC-DC conversion circuit, a DC-AC inverter circuit, 12V and 5V conversion circuits, a single chip microcomputer and driving circuit, a thyristor and load circuit, and a key display screen;
the AC-DC conversion circuit is used for converting 220V alternating current commercial power into 36V direct current;
the DC-AC inverter circuit is used for inverting the 36V direct current output by the AC-DC conversion circuit into 36V alternating current and providing the 36V alternating current to the silicon controlled rectifier and the load circuit;
the 12V and 5V conversion circuit is used for converting the 36V direct current output by the AC-DC conversion circuit into 12V direct current and 5V direct current and providing the 12V direct current and the 5V direct current to the single chip microcomputer and the driving circuit;
the single chip microcomputer and the driving circuit are used for controlling the conduction angle of the silicon controlled rectifier and the silicon controlled rectifier in the load circuit during the experiment of the thyristor rectifier circuit;
and the key display screen is used for adjusting and displaying the conduction angle of the controllable silicon and the controllable silicon in the load circuit.
Specifically, the method comprises the following steps:
the input end of the AC-DC conversion circuit is connected with a mains supply, and the output end of the AC-DC conversion circuit is respectively connected with the input end of the DC-AC inverter circuit and the input ends of the 12V and 5V conversion circuits; the output end of the DC-AC inverter circuit is connected to the power supply end of the silicon controlled rectifier and the load circuit, the output ends of the 12V and 5V conversion circuits are connected to the power supply ends of the single chip microcomputer and the drive circuit, and the control output ends of the single chip microcomputer and the drive circuit are connected to the control input ends of the silicon controlled rectifier and the load circuit; the key display screen is connected to the setting end and the display end of the single chip microcomputer and the driving circuit.
The power electronic technology teaching experimental instrument adopts the AC-DC conversion circuit and the 12V and 5V conversion circuit to convert the commercial power into the safe voltage to supply power to the singlechip and the driving circuit, so that the safety of experimental operation can be improved; the AC-DC conversion circuit and the DC-AC inverter circuit are matched to provide safe alternating voltage for the silicon controlled rectifier and the load circuit, so that the purposes of saving energy and improving stability can be realized while the safety of experimental operation is improved; the AC-DC conversion circuit and the DC-AC inverter circuit adopt a high-frequency switching power supply technology, so that the size can be reduced, and the miniaturization and portability of equipment can be realized; in addition, for the experiment of the thyristor rectification circuit part, a trigger circuit with control angle display and controlled by a single chip microcomputer is adopted, the trigger angle control adopts a key mode, the angle display adopts liquid crystal display, and the control angle is convenient and visual to adjust compared with the trigger circuit of an analog circuit.
Fig. 2-1 and 2-2 are schematic diagrams of an overall circuit structure of a teaching experimental instrument for power electronic technology of the present invention, as shown in fig. 2-1 and 2-2:
the thyristor and load circuit comprises a unidirectional thyristor Q1 of a TYN1225 model and a pure resistance load R14; the anode of the unidirectional silicon controlled rectifier Q1 is connected to the anode of the output end of the DC-AC inverter circuit, and the cathode of the unidirectional silicon controlled rectifier Q1 is connected to the cathode of the output end of the DC-AC inverter circuit through the pure resistance load R14. The silicon controlled rectifier and the load circuit are designed and selected in a miniaturized manner, so that the cost can be saved, and the volume can be reduced.
The single-chip microcomputer and the driving circuit comprise a single-chip microcomputer U1 and a driving circuit, wherein the single-chip microcomputer U1 is specifically an STC89C52 type single-chip microcomputer; the driving circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a triode Q6, a triode Q7, a triode Q8, a triode Q9, a pulse transformer T1, a capacitor C44, a capacitor 36, a diode D17 and a diode D16; one end of the resistor R5 is connected to a P20 pin of the single chip microcomputer U1, the other end of the resistor R5 is connected to a base of the transistor Q6, a collector of the transistor Q6 is connected to a 12V output end of the 12V and 5V conversion circuit through the resistor R6, an emitter of the transistor Q6 is grounded, a collector of the transistor Q6 is further connected to a base of the transistor Q7 and a base of the transistor Q8 through the resistor R7, a collector of the transistor Q7 is connected to a 12V output end of the 12V and 5V conversion circuit, a collector of the transistor Q8 is grounded, an emitter of the transistor Q7 and an emitter of the transistor Q8 are both connected to one end of a primary coil of the pulse transformer T1 through a capacitor C44, the other end of the primary coil of the pulse transformer T1 is grounded, and one end of a secondary coil of the pulse transformer T1 is connected to a negative electrode of the diode D17 through the resistor R8 The other end of the secondary winding of the pulse transformer T1 is connected to the anode of the diode D17 through the capacitor C36, the other end of the secondary coil of the pulse transformer T1 is also connected to the anode of the diode D17 through the resistor R9, the other end of the secondary coil of the pulse transformer T1 is also connected to the cathode of the diode D16, the anode of the diode D16 is connected to the anode of the diode D17 through the resistor R10, the base of the transistor Q9 is connected to the anode of the diode D17, the collector of the transistor Q9 is connected to the cathode of the diode D17, the emitter of the triode Q9 is connected to the anode of the diode D16, the collector of the triode Q9 is connected to the control electrode of the unidirectional thyristor Q1, and the emitter of the triode Q9 is connected to the cathode of the unidirectional thyristor Q1.
The driving principle of the driving circuit is as follows: the resistor R5 drives the transistor Q6 and a complementary push-pull circuit (composed of a transistor Q7 and a transistor Q8) at the rear stage, the push-pull circuit composed of a transistor Q7 and a transistor Q8 drives a pulse transformer T1 at the rear stage, and the secondary stage of the pulse transformer T1 drives a one-way thyristor Q1.
The trigger pulse generating circuit controlled by the single chip microcomputer is manufactured by adopting a surface mount type original piece, so that the volume of the whole experimental equipment is further reduced.
The single chip microcomputer U1 is also provided with an alternating voltage zero crossing point signal extraction circuit, and the alternating voltage zero crossing point signal extraction circuit comprises an optocoupler U3, an optocoupler U4, a resistor R11, a resistor R22, a resistor R23 and a triode Q11; the emitting diode positive pole of opto-coupler U3 is connected on the positive pole of unidirectional silicon controlled rectifier Q1, the emitting diode negative pole of opto-coupler U3 is connected on the negative pole of unidirectional silicon controlled rectifier Q1, the emitting diode positive pole of opto-coupler U4 is connected on the negative pole of unidirectional silicon controlled rectifier Q1, the emitting diode negative pole of opto-coupler U4 is connected on the positive pole of unidirectional silicon controlled rectifier Q1, the collecting electrode of opto-coupler U3's phototriode is connected on triode Q11's base, the emitter ground of opto-coupler U3's phototriode, the collecting electrode of opto-coupler U4's phototriode is connected on triode Q11's base, the emitter ground of opto-coupler U4's phototriode, triode Q11's collecting electrode passes through resistance R23 connects the VCC, triode Q11's base passes through resistance R22 connects the VCC, triode Q11's emission ground, and the collector of the triode Q11 is connected with the P32/INT0 pin of the singlechip U1.
The key circuit comprises a key S1, a key S2 and a key S3; one end of the key S1 is grounded, the other end of the key S1 is connected to a P10 pin of the singlechip U1, and the other end of the key S1 is also connected to a voltage VCC through a resistor R1; one end of the key S2 is grounded, the other end of the key S2 is connected to a P11 pin of the singlechip U1, and the other end of the key S2 is also connected to a voltage VCC through a resistor R2; one end of the key S3 is grounded, the other end of the key S3 is connected to a P12 pin of the singlechip U1, and the other end of the key S3 is also connected to a voltage VCC through a resistor R3.
The display screen is an LCD1602 liquid crystal display screen.
Fig. 3 is a schematic circuit diagram of an AC-DC conversion circuit, which is specifically an isolated flyback AC-DC power supply.
Fig. 4 is a schematic circuit structure diagram of a DC-AC inverter circuit, specifically, an EG8010+ IR2110S + latching pure sine wave inverter (EG 02 for short), and the driving principle of the DC-AC inverter circuit is a unipolar modulation mode.
In a power electronic technology teaching experimental apparatus of the present invention:
an STC89C52 type single chip microcomputer is selected for the convenience of flexible design. Because the trigger of the thyristor is controlled, a unidirectional thyristor of the type TYN1225 is used. The load is a pure resistance load, as only the trigger of the thyristor needs to be controlled.
The thyristor is a semiconductor device widely used in circuit system design, and the semiconductor device is also often used in the development of a control system of a singlechip. The bidirectional thyristor is characterized in that after being conducted, the bidirectional thyristor still keeps conducting even if a signal is removed; when the load current is zero (zero crossing of the ac voltage), it is automatically turned off. The trigger signal needs to be sent out during each half-wave of the alternating current, and the sending time of the trigger signal determines the size of the conduction angle. The realization mode of controlling the conduction angle is that the bidirectional silicon controlled switch is triggered to be conducted after a period of zero crossing point, and the longer the period of time is, the shorter the conduction time of the silicon controlled switch is; conversely, the longer the thyristor is on. It is necessary to extract the zero crossing point of the ac voltage and determine the sending time of the trigger signal based on the zero crossing point, so as to achieve the purpose of adjustment.
When the teaching experimental instrument for the power electronic technology is used for testing:
the alternating current voltage zero crossing point signal extracting circuit is composed of an optocoupler U3, an optocoupler U4, a resistor R11, a resistor R22, a resistor R23 and a triode Q11, a P32/INT0 pin of a singlechip U1 is connected with a collector of a triode Q11 to obtain a required alternating current voltage zero crossing point signal, the waveform of the required alternating current voltage zero crossing point signal is a pulse signal shown in figure 5, the optocoupler U3 inputs a threshold voltage of a diode, the pulse signal is used as a timing zero point of a trigger pulse generated by the singlechip U1 to calculate a control angle of the trigger pulse
The main control unit takes an STC89C52 singlechip as a core, a synchronous signal generated in an alternating voltage zero-crossing point signal extraction circuit is connected to INT0 of STC89C52, and the falling edge of the signal can interrupt STC89C52, so that the falling edge is used as the starting point of delay time. The control angle of the trigger pulse is calculated, the trigger pulse is sent to the one-way thyristor, the output voltage is controlled, and the control flow is shown in fig. 6.
Three buttons (button S1, button S2, and button S3) are used to control only a single thyristor: one is a switch and the other two are respectively an increase conduction angle and a decrease conduction angle. The timing relationship among the 220V ac main power-on interval, the synchronization signal and the trigger signal is shown in fig. 7. The shaded portion in fig. 7 indicates the conduction interval of the thyristor, and the size of the conduction interval determines the conduction degree of the thyristor. The phase relation between the trigger signal and the synchronous signal can be changed by changing the delay time, namely the purpose of controlling the conduction angle is achieved.
In the present invention:
1, the highest 36 volt-ampere total voltage that adopts of whole system, equal miniaturized design and selection such as silicon controlled rectifier and load circuit, student's experiment operation security improves, and whole equipment power consumption reduces.
2, for the experiment of the thyristor rectification circuit part, a trigger circuit which is controlled by a single chip microcomputer and has control angle display is adopted, the trigger angle control adopts a key mode, the angle display adopts liquid crystal display, the control angle is compared with the trigger circuit of an analog circuit, and the control angle is convenient and visual to adjust.
3, the AC-DC conversion circuit and the DC-AC inverter circuit adopt a high-frequency switching power supply technology, so that the volume of equipment can be reduced, miniaturization and portability are realized, and the use by a user is facilitated.
The small-sized portable power electronic experimental equipment with low cost, economy and applicability is a blank in the current market, is expected to have better market prospect, can meet the requirements of numerous small colleges with intense funds, can face students or electronic enthusiasts, and has great significance for teaching and popularization of power electronic technology.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a power electronic technology teaching experiment instrument which characterized in that: the device comprises an AC-DC conversion circuit, a DC-AC inverter circuit, 12V and 5V conversion circuits, a singlechip, a driving circuit, a silicon controlled rectifier, a load circuit and a key display screen;
the AC-DC conversion circuit is used for converting 220V alternating current commercial power into 36V direct current;
the DC-AC inverter circuit is used for inverting the 36V direct current output by the AC-DC conversion circuit into 36V alternating current and providing the 36V alternating current to the silicon controlled rectifier and the load circuit;
the 12V and 5V conversion circuit is used for converting the 36V direct current output by the AC-DC conversion circuit into 12V direct current and 5V direct current and providing the 12V direct current and the 5V direct current to the single chip microcomputer and the driving circuit;
the single chip microcomputer and the driving circuit are used for controlling the conduction angle of the silicon controlled rectifier and the silicon controlled rectifier in the load circuit during the experiment of the thyristor rectifier circuit;
and the key display screen is used for adjusting and displaying the conduction angle of the controllable silicon and the controllable silicon in the load circuit.
2. The teaching experimental instrument for power electronic technology as claimed in claim 1, wherein: the input end of the AC-DC conversion circuit is connected with a mains supply, and the output end of the AC-DC conversion circuit is respectively connected with the input end of the DC-AC inverter circuit and the input ends of the 12V and 5V conversion circuits; the output end of the DC-AC inverter circuit is connected to the power supply end of the silicon controlled rectifier and the load circuit, the output ends of the 12V and 5V conversion circuits are connected to the power supply ends of the single chip microcomputer and the drive circuit, and the control output ends of the single chip microcomputer and the drive circuit are connected to the control input ends of the silicon controlled rectifier and the load circuit; the key display screen is connected to the setting end and the display end of the single chip microcomputer and the driving circuit.
3. The teaching experimental instrument for power electronic technology as claimed in claim 2, wherein: the thyristor and load circuit comprises a unidirectional thyristor Q1 of a TYN1225 model and a pure resistance load R14; the anode of the unidirectional silicon controlled rectifier Q1 is connected to the anode of the output end of the DC-AC inverter circuit, and the cathode of the unidirectional silicon controlled rectifier Q1 is connected to the cathode of the output end of the DC-AC inverter circuit through the pure resistance load R14.
4. A power electronics teaching laboratory apparatus according to claim 3 wherein: the single-chip microcomputer and the driving circuit comprise a single-chip microcomputer U1 and a driving circuit, wherein the single-chip microcomputer U1 is specifically an STC89C52 type single-chip microcomputer; the driving circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a triode Q6, a triode Q7, a triode Q8, a triode Q9, a pulse transformer T1, a capacitor C44, a capacitor 36, a diode D17 and a diode D16; one end of the resistor R5 is connected to a P20 pin of the single chip microcomputer U1, the other end of the resistor R5 is connected to a base of the transistor Q6, a collector of the transistor Q6 is connected to a 12V output end of the 12V and 5V conversion circuit through the resistor R6, an emitter of the transistor Q6 is grounded, a collector of the transistor Q6 is further connected to a base of the transistor Q7 and a base of the transistor Q8 through the resistor R7, a collector of the transistor Q7 is connected to a 12V output end of the 12V and 5V conversion circuit, a collector of the transistor Q8 is grounded, an emitter of the transistor Q7 and an emitter of the transistor Q8 are both connected to one end of a primary coil of the pulse transformer T1 through a capacitor C44, the other end of the primary coil of the pulse transformer T1 is grounded, and one end of a secondary coil of the pulse transformer T1 is connected to a negative electrode of the diode D17 through the resistor R8 The other end of the secondary winding of the pulse transformer T1 is connected to the anode of the diode D17 through the capacitor C36, the other end of the secondary coil of the pulse transformer T1 is also connected to the anode of the diode D17 through the resistor R9, the other end of the secondary coil of the pulse transformer T1 is also connected to the cathode of the diode D16, the anode of the diode D16 is connected to the anode of the diode D17 through the resistor R10, the base of the transistor Q9 is connected to the anode of the diode D17, the collector of the transistor Q9 is connected to the cathode of the diode D17, the emitter of the triode Q9 is connected to the anode of the diode D16, the collector of the triode Q9 is connected to the control electrode of the unidirectional thyristor Q1, and the emitter of the triode Q9 is connected to the cathode of the unidirectional thyristor Q1.
5. The teaching experimental instrument for power electronic technology as claimed in claim 4, wherein: the single chip microcomputer U1 is also provided with an alternating voltage zero crossing point signal extraction circuit, and the alternating voltage zero crossing point signal extraction circuit comprises an optocoupler U3, an optocoupler U4, a resistor R11, a resistor R22, a resistor R23 and a triode Q11; the emitting diode positive pole of opto-coupler U3 is connected on the positive pole of unidirectional silicon controlled rectifier Q1, the emitting diode negative pole of opto-coupler U3 is connected on the negative pole of unidirectional silicon controlled rectifier Q1, the emitting diode positive pole of opto-coupler U4 is connected on the negative pole of unidirectional silicon controlled rectifier Q1, the emitting diode negative pole of opto-coupler U4 is connected on the positive pole of unidirectional silicon controlled rectifier Q1, the collecting electrode of opto-coupler U3's phototriode is connected on triode Q11's base, the emitter ground of opto-coupler U3's phototriode, the collecting electrode of opto-coupler U4's phototriode is connected on triode Q11's base, the emitter ground of opto-coupler U4's phototriode, triode Q11's collecting electrode passes through resistance R23 connects the VCC, triode Q11's base passes through resistance R22 connects the VCC, triode Q11's emission ground, and the collector of the triode Q11 is connected with the P32/INT0 pin of the singlechip U1.
6. A power electronic technology teaching experimental instrument according to claim 4 or 5, characterized in that: the key circuit comprises a key S1, a key S2 and a key S3; one end of the key S1 is grounded, the other end of the key S1 is connected to a P10 pin of the singlechip U1, and the other end of the key S1 is also connected to a voltage VCC through a resistor R1; one end of the key S2 is grounded, the other end of the key S2 is connected to a P11 pin of the singlechip U1, and the other end of the key S2 is also connected to a voltage VCC through a resistor R2; one end of the key S3 is grounded, the other end of the key S3 is connected to a P12 pin of the singlechip U1, and the other end of the key S3 is also connected to a voltage VCC through a resistor R3.
7. A power electronic technology teaching experimental instrument according to claim 4 or 5, characterized in that: the display screen is an LCD1602 liquid crystal display screen.
8. A power electronics teaching laboratory instrument according to any one of claims 1 to 5, further comprising: the AC-DC conversion circuit is specifically an isolated flyback AC-DC power supply.
9. The teaching experimental instrument for power electronic technology as claimed in claim 8, wherein: the DC-AC inverter circuit is specifically an EG8010+ IR2110S + latching pure sine wave inverter.
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| CN201911126585.0A CN110930836A (en) | 2019-11-18 | 2019-11-18 | Power electronic technology teaching experimental instrument |
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Application publication date: 20200327 |