CN213402849U - Three-phase inverter with high control precision - Google Patents
Three-phase inverter with high control precision Download PDFInfo
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- CN213402849U CN213402849U CN202022593214.8U CN202022593214U CN213402849U CN 213402849 U CN213402849 U CN 213402849U CN 202022593214 U CN202022593214 U CN 202022593214U CN 213402849 U CN213402849 U CN 213402849U
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Abstract
The utility model relates to a three-phase inverter with high control precision, which comprises a three-phase inverter circuit and a processor, wherein a load voltage acquisition circuit, a drive protection circuit, a current acquisition circuit and a direct current input voltage acquisition circuit are connected between the three-phase inverter circuit and the processor; the processor realizes real-time acquisition of the output voltage of the inverter through the load voltage measuring circuit, real-time comparison of the calculated value of the real-time effective value of the output voltage with a given rated voltage value to form a voltage deviation signal, and then realizes the consistency of the output voltage and the given rated voltage through the calculation processing of the processor; the direct current input voltage acquisition circuit and the current acquisition circuit are used for direct current overvoltage and current overcurrent protection. The driving protection circuit converts a 3.3V control signal into a 15V signal to drive the power switching tube to work, and simultaneously interlocks the driving signals of the upper bridge arm and the lower bridge arm, thereby effectively preventing the power tube of the same bridge arm from being directly connected and effectively ensuring the normal work of the three-phase inverter when in use.
Description
Technical Field
The utility model belongs to the technical field of the dc-to-ac converter, a three-phase dc-to-ac converter that control accuracy is high is related to.
Background
The inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current (generally 220V,50Hz sine wave). It is composed of inverter bridge, control logic and filter circuit. The multifunctional electric grinding wheel is widely applicable to air conditioners, home theaters, electric grinding wheels, electric tools, sewing machines, DVDs (digital video disks), VCDs (video recorders), computers, televisions, washing machines, range hoods, refrigerators, video recorders, massagers, fans, lighting and the like.
When the inverter is used, the inverter can be ensured to normally operate only by ensuring that the voltage and current sampling of the input and output circuits of the inverter are the same as the rated value, and the inverter is prevented from being out of order when in use.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a three-phase inverter that control accuracy is high has increased sampling circuit between three-phase inverter circuit and treater, has realized the treater to three-phase inverter circuit's accurate control.
The technical proposal adopted by the utility model is that,
the three-phase inverter with high control precision comprises a three-phase inverter circuit and a processor, wherein a load voltage acquisition circuit, a driving protection circuit, a current acquisition circuit and a direct current input voltage acquisition circuit are connected between the three-phase inverter circuit and the processor;
the load voltage acquisition circuit comprises an operational amplifier U1, wherein a second group of operational amplifier input pins IN 2-and IN2+ of the operational amplifier U1 are used as the input end of the load voltage acquisition circuit to be connected with the positive pole and the negative pole of a three-phase inverter circuit load, a second group of operational amplifier output pins OUT2 of the operational amplifier U1 are connected with a first group of operational amplifier input pins IN1+ of the operational amplifier U1, and a first group of operational amplifier output pins OUT1 of the operational amplifier U1 are connected with a processor.
The driving protection circuit comprises a driving chip U4 and a driving chip U5,
the AN pin of the driving chip U4 receives a driving signal PWM1H of the processor through a triode Q1, the OUT pin of the driving chip U4 outputs a control signal HO1 to a power tube T1 of the three-phase inverter circuit through a triode Q2,
the base electrode of the triode Q1 is connected with the processor through a resistor R46, the collector electrode of the triode Q1 is connected with a 5V voltage source, and the emitter electrode of the triode Q1 is connected with AN AN pin of a driving chip U4; the base electrode of the triode Q2 is connected with the OUT pin of the driving chip U4, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the grid electrode of a power tube T1 in the three-phase inverter circuit through a resistor R48, and a resistor R49 is connected between the base electrode and the collector electrode of the triode Q2 in parallel;
the AN pin of the driving chip U5 is connected with a driving signal PWM1L of the processor by a triode Q3, the OUT pin of the driving chip U5 is output to a control signal LO1 of a power tube T2 of the three-phase inverter circuit by a triode Q4,
the base electrode of the triode Q3 is connected with the processor through a resistor R52, the collector electrode of the triode Q4 is connected with a 5V voltage source, and the emitter electrode of the triode Q3 is connected with AN AN pin of a driving chip U5; the base electrode of the triode Q4 is connected with the OUT pin of the driving chip U5, the emitter electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected with the grid electrode of a power tube T2 in the three-phase inverter circuit through a resistor R54, and a resistor R55 is connected between the base electrode and the collector electrode of the triode Q4 in parallel.
The current acquisition circuit comprises a current transformer CT and an operational amplifier U2, the primary side of the current transformer CT is connected in series with the output circuit of one phase of the three-phase inverter circuit, a current acquisition circuit is connected to the back of a secondary side parallel resistor R16 of the current transformer CT, one end of the secondary side of the current transformer CT is sequentially connected with a resistor R17 and a resistor R20 IN series and then connected with a first group of operational amplifier input pins IN 1-of an operational amplifier U2, the other end of the secondary side of the current transformer CT is sequentially connected with a resistor R18 and a resistor R21 IN series and then connected with a first group of operational amplifier input pins IN1+ of an operational amplifier U2, a first group of operational amplifier output pins OUT1 of the operational amplifier U2 is sequentially connected with a resistor R25 and a resistor R24 IN series and then connected with a second group of operational amplifier input pins IN2+ of the operational amplifier U2, and a second group of operational amplifier output pins OUT2 of the operational amplifier U2 is connected with a processor.
A capacitor C10 is connected IN parallel between the resistor R17 and the resistor R18, a resistor R19 and a capacitor C11 are connected IN parallel between the resistor R20 and an IN 1-pin of the operational amplifier, a resistor R22 and a capacitor C12 are connected IN parallel between the resistor R21 and an IN1+ pin of the operational amplifier, a 3V voltage source is connected between the resistor R25 and the resistor R24 through a resistor R23 which is connected IN parallel, and the resistor R24 and the IN2+ pin of the operational amplifier are grounded through a capacitor C16 which is connected IN parallel.
The direct-current input voltage acquisition circuit comprises an operational amplifier U3, wherein a second group of operational amplifier input pins IN 2-and IN2+ of the operational amplifier U3 are used as the input end of the direct-current input voltage acquisition circuit and are connected with the positive pole and the negative pole of the input voltage of the three-phase inverter circuit, a second group of operational amplifier output pins OUT2 of the operational amplifier U3 are connected with a first group of operational amplifier input pins IN1+ of the operational amplifier U1, and a first group of operational amplifier output pins OUT1 of the operational amplifier U1 are connected with a processor.
The utility model has the advantages that:
the processor realizes real-time acquisition of the output voltage of the inverter through the load voltage measuring circuit, real-time comparison of the calculated value of the real-time effective value of the output voltage with a given rated voltage value to form a voltage deviation signal, and then realizes the consistency of the output voltage and the given rated voltage through the calculation processing of the processor; the direct current input voltage acquisition circuit and the current acquisition circuit are used for direct current overvoltage and current overcurrent protection. The driving protection circuit converts a 3.3V control signal into a 15V signal to drive the power switching tube to work, and simultaneously interlocks the driving signals of the upper bridge arm and the lower bridge arm, thereby effectively preventing the power tube of the same bridge arm from being directly connected and effectively ensuring the normal work of the three-phase inverter when in use.
The present invention will be described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a block diagram of the circuit flow of the present invention;
fig. 2 is a circuit diagram of the load voltage acquisition circuit of the present invention;
fig. 3 is a circuit diagram of the driving protection circuit of the present invention;
fig. 4 is a circuit diagram of the current collecting circuit of the present invention;
fig. 5 is the dc input voltage acquisition circuit of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, but the scope and implementation of the present invention are not limited thereto.
The processor is a TMS320F28335 type single chip microcomputer, the processor realizes real-time collection of the output voltage of the inverter through a load voltage measuring circuit, real-time effective value calculated values of the output voltage are compared with a given rated voltage value in real time to form voltage deviation signals, and then the output voltage is consistent with the given rated voltage through operation processing of the processor; the direct current input voltage acquisition circuit and the current acquisition circuit are used for direct current overvoltage and current overcurrent protection. The driving protection circuit converts a 3.3V control signal into a 15V signal to drive the power switching tube to work, and simultaneously interlocks the driving signals of the upper bridge arm and the lower bridge arm, thereby effectively preventing the power switching tube of the same bridge arm from being directly connected.
Further, as shown IN fig. 2, after the positive electrode of the three-phase inverter circuit load is subjected to first-stage filtering by means of resistors R8, R9, R10, R11 and a capacitor C2 which are connected IN sequence, an input resistor R2 and a capacitor C7 are subjected to second-stage filtering, and then the third-stage filtering is performed by means of a resistor R1 and a capacitor C3 and is input into a second group of operational amplifier input pins IN2+ of the operational amplifier U1; after the negative pole of the three-phase inverter circuit load is subjected to first-stage filtering by virtue of resistors R12, R13, R14, R15 and a capacitor C6 which are sequentially connected, an input resistor R5 and a capacitor C1 are subjected to second-stage filtering, and then third-stage filtering is performed by virtue of a resistor R6 and a capacitor C4 to be input into a second group of operational amplifier input pins IN2 & lt- & gt of an operational amplifier U1; the second group of operational amplifier output pins OUT2 of the operational amplifier U1 are subjected to fourth-stage filtering through a resistor R4 and a capacitor C5 and then are input into the first group of operational amplifier input pins IN1+ of the operational amplifier U1; the first group of operational amplifiers of the operational amplifier U1 adopts a voltage follower connection mode, namely a first group of operational amplifier input pins IN1 of the operational amplifier U1 are connected IN parallel with the output pins OUT1 of the first group of operational amplifiers of the operational amplifier U1 and used for improving the acquisition precision of acquired signals, and the first group of operational amplifier output pins OUT1 of the operational amplifier U1 transmits load voltage signals to an analog-to-digital conversion interface of a digital signal processor, so that the load voltage signal sampling is realized.
The effective value is used for sampling the output voltage of the three-phase inverter circuit, the voltage error can be reduced, the sampling period is shortened, the output result is continuously arranged in the original data, the integrity of elements in a window is strong, one phase voltage of the three-phase voltage is acquired, and the operation steps are simplified. The combination of the specific driving circuit and the load voltage acquisition circuit has the advantages of simple structure, low cost, strong anti-interference capability and the like.
In the specific embodiment 2, the voltage sampling algorithm adopts a sliding window sampling mode to realize the real-time acquisition of the output voltage of the inverter. And comparing the calculated value of the real-time effective value of the output voltage with the given rated voltage value in real time to form a voltage deviation signal, and then adjusting the SVPWM modulation ratio in real time through a PID program in the processor to realize the consistency of the output voltage and the given rated voltage.
The sliding window sampling method is as follows:
suppose the measured voltage is U (t) Umsin (ω t) and N average samples are taken in each period, the sampling phase interval is then
Assuming that sampling is started from the kth point, and the corresponding phase angle of the kth sampling point is recorded, completing sampling at the kth + N sampling points; during the sampling process, the instantaneous value of the voltage at the jth sampling point can be expressed as
According to the voltage effective value calculation formula, the voltage effective value can be obtained as
When sampling for the (N + 1) th time, the 1 st sampling voltage value needs to be removed, and N sampling values from the 2 nd time to the (N + 1) th time are reserved, so that continuous voltage sampling of a sliding window can be realized, and one control calculation can be completed between two sampling intervals.
the AN pin of the driving chip U4 receives a driving signal PWM1H of the processor through a triode Q1, the OUT pin of the driving chip U4 outputs a control signal HO1 to a power tube T1 of the three-phase inverter circuit through a triode Q2,
the base electrode of the triode Q1 is connected with the processor through a resistor R46, the collector electrode of the triode Q1 is connected with a 5V voltage source, and the emitter electrode of the triode Q1 is connected with AN AN pin of a driving chip U4; the base electrode of the triode Q2 is connected with the OUT pin of the driving chip U4, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the grid electrode of a power tube T1 in the three-phase inverter circuit through a resistor R48, and a resistor R49 is connected between the base electrode and the collector electrode of the triode Q2 in parallel;
the AN pin of the driving chip U5 is connected with a driving signal PWM1L of the processor by a triode Q3, the OUT pin of the driving chip U5 is output to a control signal LO1 of a power tube T2 of the three-phase inverter circuit by a triode Q4,
the base electrode of the triode Q3 is connected with the processor through a resistor R52, the collector electrode of the triode Q4 is connected with a 5V voltage source, and the emitter electrode of the triode Q3 is connected with AN AN pin of a driving chip U5; the base electrode of the triode Q4 is connected with the OUT pin of the driving chip U5, the emitter electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected with the grid electrode of a power tube T2 in the three-phase inverter circuit through a resistor R54, and a resistor R55 is connected between the base electrode and the collector electrode of the triode Q4 in parallel.
The input end of the drive protection circuit is connected with a processor drive signal, the output end of the drive protection circuit is connected with power tubes of a three-phase inverter circuit, and each drive circuit can drive two power tubes in one phase circuit, so that the three-phase inverter circuit needs three drive circuits, the drive chips U4 and U5 are drive chips of model TLP350, and the TLP350 drive chip has a power supply isolation function;
driving signals PWM1H and PWM1L generated by a processor are input to AN pins of U4 and U5 of a driving chip respectively through transistors Q1 and Q3, and driving signals HO1 and LO1 are generated; when the PWM1H is at a high level, the transistor Q1 is turned on, the OUT pin of the driver chip U4 outputs a high level, the driver signal HO1 is at a high level through the resistor R49, when the PWM1H is at a low level, the transistor Q1 is turned off, the OUT pin of the driver chip U4 outputs a low level, and the driver signal HO1 is changed to a low level through the transistor Q2 for fast discharging; the PWM1L signal is complementary to PWM1H to reliably drive the power transistor on and off.
Further, as shown IN fig. 4, a capacitor C10 is connected IN parallel between the resistor R17 and the resistor R18, a resistor R19 and a capacitor C11 are connected IN parallel between the resistor R20 and the IN 1-pin of the operational amplifier, a resistor R22 and a capacitor C12 are connected IN parallel between the resistor R21 and the IN1+ pin of the operational amplifier, a 3V voltage source is connected between the resistor R25 and the resistor R24 through a parallel resistor R23, and a ground is connected between the resistor R24 and the IN2+ pin of the operational amplifier through a parallel capacitor C16.
The output current of the three-phase inverter circuit is input into a current acquisition circuit by a current transformer CT, the output current of the current transformer CT is converted into a voltage signal by a resistor R16, and is subjected to first filtering by a filter consisting of a resistor R17, a resistor R18 and a capacitor C10, and then is input into a first group of operational amplifier input pins IN 1-and IN1+ of an operational amplifier U2 by a resistor R20, a resistor R17, a capacitor C11, a resistor R21, a resistor R22 and a capacitor C12 for second filtering, and is amplified by an operational amplifier U2 to output a U-I signal, the U-I signal is conditioned to be between 0 and 3V by the resistor R23, the resistor R25 and the REF-3V, and is input into a second group of operational amplifier input pins IN2+ of the operational amplifier U2 by a low pass filter consisting of the resistor R24 and the capacitor C16, and the second group of operational amplifier input pins IN 2-OUT 2 of the operational amplifier U2 are connected IN parallel, a wiring mode of a voltage follower is adopted for improving the acquisition precision of the acquired signal; and then output through the second set of op-amp pins OUT2 of op-amp U2. And the current signal is transmitted to an analog-to-digital conversion interface of the digital signal processor, so that the current signal sampling is realized.
IN specific embodiment 5, as shown IN fig. 5, the dc input voltage collecting circuit includes an operational amplifier U3, the second set of operational amplifier input pins IN 2-and IN2+ of the operational amplifier U3 are used as input terminals of the dc input voltage collecting circuit and connected to the positive and negative poles of the input voltage of the three-phase inverter circuit, the second set of operational amplifier output pins OUT2 of the operational amplifier U3 is connected to the first set of operational amplifier input pins IN1+ of the operational amplifier U1, and the first set of operational amplifier output pins OUT1 of the operational amplifier U1 is connected to the processor.
After the positive electrode of the input voltage of the three-phase inverter circuit is subjected to first-stage filtering by sequentially connected resistors R26, R27, R28, R29, R30, R31 and a capacitor C17, the input resistor R39 and the capacitor C23 are subjected to second-stage filtering, and then the third-stage filtering is performed by a resistor R38 and a capacitor C18 to be input into a second group of operational amplifier input pins IN2+ of an operational amplifier U3; after the negative pole of the input voltage of the three-phase inverter circuit is subjected to first-stage filtering by virtue of resistors R32, R33, R34, R35, R36, R37 and a capacitor C22 which are sequentially connected, input resistor R42 and capacitor C21 are subjected to second-stage filtering, and then the third-stage filtering is performed by virtue of resistor R43 and capacitor C19 to be input into a second group of operational amplifier input pins IN2 & lt- & gt of an operational amplifier U3; the second group of operational amplifier output pins OUT2 of the operational amplifier U3 are subjected to fourth-stage filtering through a resistor R41 and a capacitor C20 and then are input into the first group of operational amplifier input pins IN1+ of the operational amplifier U3; the first group of operational amplifiers of the operational amplifier U3 adopts a voltage follower connection mode, namely a first group of operational amplifier input pins IN1 of the operational amplifier U3 are connected IN parallel with the output pins OUT1 of the first group of operational amplifiers of the operational amplifier U3 and used for improving the acquisition precision of acquired signals, and the first group of operational amplifier output pins OUT1 of the operational amplifier U3 transmits direct-current input voltage signals to an analog-to-digital conversion interface of a digital signal processor, so that the sampling of load voltage signals is realized.
Claims (5)
1. Three-phase inverter that control accuracy is high, including three-phase inverter circuit and treater, its characterized in that: a load voltage acquisition circuit, a driving protection circuit, a current acquisition circuit and a direct current input voltage acquisition circuit are also connected between the three-phase inverter circuit and the processor;
the load voltage acquisition circuit comprises an operational amplifier U1, wherein a second group of operational amplifier input pins IN 2-and IN2+ of the operational amplifier U1 are used as the input end of the load voltage acquisition circuit to be connected with the positive pole and the negative pole of a three-phase inverter circuit load, a second group of operational amplifier output pins OUT2 of the operational amplifier U1 are connected with a first group of operational amplifier input pins IN1+ of the operational amplifier U1, and a first group of operational amplifier output pins OUT1 of the operational amplifier U1 are connected with a processor.
2. The three-phase inverter according to claim 1, wherein the three-phase inverter has high control accuracy: the driving protection circuit comprises a driving chip U4 and a driving chip U5,
the AN pin of the driving chip U4 receives a driving signal PWM1H of the processor through a triode Q1, the OUT pin of the driving chip U4 outputs a control signal HO1 to a power tube T1 of the three-phase inverter circuit through a triode Q2,
the base electrode of the triode Q1 is connected with the processor through a resistor R46, the collector electrode of the triode Q1 is connected with a 5V voltage source, and the emitter electrode of the triode Q1 is connected with AN AN pin of a driving chip U4; the base electrode of the triode Q2 is connected with the OUT pin of the driving chip U4, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is connected with the grid electrode of a power tube T1 in the three-phase inverter circuit through a resistor R48, and a resistor R49 is connected between the base electrode and the collector electrode of the triode Q2 in parallel;
the AN pin of the driving chip U5 is connected with a driving signal PWM1L of the processor by a triode Q3, the OUT pin of the driving chip U5 is output to a control signal LO1 of a power tube T2 of the three-phase inverter circuit by a triode Q4,
the base electrode of the triode Q3 is connected with the processor through a resistor R52, the collector electrode of the triode Q4 is connected with a 5V voltage source, and the emitter electrode of the triode Q3 is connected with AN AN pin of a driving chip U5; the base electrode of the triode Q4 is connected with the OUT pin of the driving chip U5, the emitter electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected with the grid electrode of a power tube T2 in the three-phase inverter circuit through a resistor R54, and a resistor R55 is connected between the base electrode and the collector electrode of the triode Q4 in parallel.
3. The three-phase inverter according to claim 1, wherein the three-phase inverter has high control accuracy: the current acquisition circuit comprises a current transformer CT and an operational amplifier U2, the primary side of the current transformer CT is connected in series with the output circuit of one phase of the three-phase inverter circuit, a current acquisition circuit is connected to the back of a secondary side parallel resistor R16 of the current transformer CT, one end of the secondary side of the current transformer CT is sequentially connected with a resistor R17 and a resistor R20 IN series and then connected with a first group of operational amplifier input pins IN 1-of an operational amplifier U2, the other end of the secondary side of the current transformer CT is sequentially connected with a resistor R18 and a resistor R21 IN series and then connected with a first group of operational amplifier input pins IN1+ of an operational amplifier U2, a first group of operational amplifier output pins OUT1 of the operational amplifier U2 is sequentially connected with a resistor R25 and a resistor R24 IN series and then connected with a second group of operational amplifier input pins IN2+ of the operational amplifier U2, and a second group of operational amplifier output pins OUT2 of the operational amplifier U2 is connected with a processor.
4. The three-phase inverter according to claim 3, wherein the three-phase inverter has high control accuracy: a capacitor C10 is connected IN parallel between the resistor R17 and the resistor R18, a resistor R19 and a capacitor C11 are connected IN parallel between the resistor R20 and an IN 1-pin of the operational amplifier, a resistor R22 and a capacitor C12 are connected IN parallel between the resistor R21 and an IN1+ pin of the operational amplifier, a 3V voltage source is connected between the resistor R25 and the resistor R24 through a resistor R23 which is connected IN parallel, and the resistor R24 and the IN2+ pin of the operational amplifier are grounded through a capacitor C16 which is connected IN parallel.
5. The three-phase inverter according to claim 1, wherein the three-phase inverter has high control accuracy: the direct-current input voltage acquisition circuit comprises an operational amplifier U3, wherein a second group of operational amplifier input pins IN 2-and IN2+ of the operational amplifier U3 are used as the input end of the direct-current input voltage acquisition circuit and are connected with the positive pole and the negative pole of the input voltage of the three-phase inverter circuit, a second group of operational amplifier output pins OUT2 of the operational amplifier U3 are connected with a first group of operational amplifier input pins IN1+ of the operational amplifier U1, and a first group of operational amplifier output pins OUT1 of the operational amplifier U1 are connected with a processor.
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| CN202022593214.8U CN213402849U (en) | 2020-11-11 | 2020-11-11 | Three-phase inverter with high control precision |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765379A (en) * | 2021-08-31 | 2021-12-07 | 湖北三江航天万峰科技发展有限公司 | Digital voltage stabilizing device based on current loop control and control method thereof |
| CN114678834A (en) * | 2022-05-27 | 2022-06-28 | 深圳芯能半导体技术有限公司 | Overload protection circuit and method for three-phase asynchronous motor |
-
2020
- 2020-11-11 CN CN202022593214.8U patent/CN213402849U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765379A (en) * | 2021-08-31 | 2021-12-07 | 湖北三江航天万峰科技发展有限公司 | Digital voltage stabilizing device based on current loop control and control method thereof |
| CN114678834A (en) * | 2022-05-27 | 2022-06-28 | 深圳芯能半导体技术有限公司 | Overload protection circuit and method for three-phase asynchronous motor |
| CN114678834B (en) * | 2022-05-27 | 2022-09-13 | 深圳芯能半导体技术有限公司 | Overload protection circuit and method for three-phase asynchronous motor |
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