CN108490293B - Detection circuit and control method of three-phase inverter - Google Patents
Detection circuit and control method of three-phase inverter Download PDFInfo
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- CN108490293B CN108490293B CN201810247656.1A CN201810247656A CN108490293B CN 108490293 B CN108490293 B CN 108490293B CN 201810247656 A CN201810247656 A CN 201810247656A CN 108490293 B CN108490293 B CN 108490293B
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- 238000001514 detection method Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 81
- 238000002955 isolation Methods 0.000 claims abstract description 66
- 239000003990 capacitor Substances 0.000 claims description 28
- 238000004146 energy storage Methods 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 3
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 3
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- 238000007599 discharging Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a detection circuit and a control method of a three-phase inverter, wherein the detection circuit comprises a direct current bus voltage detection circuit, a phase current detection circuit for detecting the output of the three-phase inverter and a direct current power supply, the ground end of the primary side of a direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator of the direct current bus voltage detection circuit is connected with the N line of the direct current bus and grounded, and the ground end of the primary side of an alternating current side current sampling photoelectric isolation Sigma-Delta modulator of the phase current detection circuit is directly connected with the phase output end corresponding to the three-phase inverter. The phase current detection and direct current bus voltage detection circuit of the three-phase inverter provided by the invention realizes detection of bus voltage and phase current based on the Sigma-Delta ADC technology, improves detection precision, and simultaneously, only uses one group of direct current power supplies for photoelectric isolation of primary side power supply voltage of a Sigma-Delta modulator, thereby improving the performance of an inverter system and reducing the system cost.
Description
Technical Field
The invention belongs to the technical field of inverter control, and particularly relates to a detection circuit and a control method of a three-phase inverter.
Background
Sigma-Delta ADCs (Sigma-Delta analog-to-digital converters) are widely used for electrically isolated motor drive and grid-tie inverter applications. The Sigma-Delta ADC relaxes the requirement of the analog anti-aliasing filter by oversampling the signal, and the Delta-Sigma ADC mainly consists of a digital circuit, so that the advantages of the ultra-large scale integrated circuit technology can be fully exerted. In a detection circuit of a three-phase inverter, a direct current bus voltage and a two-phase current are generally detected. Delta-Sigma ADC circuitry is typically composed of RC analog filters, photo-electrically isolated Sigma-Delta modulators, digital filters, and the like. In an electrically isolated Sigma-Delta modulator circuit, the primary side circuit and the secondary side circuit are isolated by an opto-coupler. The ground end of the primary side of the photoelectric isolation Sigma-Delta modulator is connected with the ground end of the measured circuit quantity, so that three independent direct current power supplies are usually needed for measuring the direct current bus voltage and the two-phase current, and the circuit complexity and the cost are improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a detection circuit of a three-phase inverter, which comprises a phase current detection circuit and a direct current bus voltage detection circuit, wherein the phase current detection circuit and the direct current bus voltage detection circuit only need one group of direct current power supply sources, so that the number of the direct current power supply sources can be reduced, and the design complexity and the cost of a system are reduced.
Another object of the present invention is to provide a control method of a detection circuit of a three-phase inverter, which uses an initial stage to power an energy storage capacitor and directly power to complete an initialization operation, so as to effectively ensure a subsequent stable operation.
The invention is realized by the following technical scheme:
The detection circuit of the three-phase inverter comprises a direct-current bus voltage detection circuit, a phase current detection circuit and a direct-current power supply, wherein the phase current detection circuit is used for detecting output of the three-phase inverter, the ground end of the primary side of a direct-current bus voltage detection circuit is connected with the N line of the direct-current bus, the N line of the direct-current bus is connected with the ground end of the direct-current power supply, the ground end of the primary side of the alternating-current side current sampling photoelectric isolation Sigma-Delta modulator is directly connected with the corresponding phase output end of the three-phase inverter, the positive electrode of the direct-current power supply is connected with the power supply end of the primary side of the direct-current side bus voltage sampling photoelectric isolation Sigma-Delta modulator, the power supply circuit of the primary side of the alternating-current side current sampling photoelectric isolation Sigma-Delta modulator comprises an ultrafast recovery diode and a current limiting resistor which are sequentially connected with the positive electrode of the direct-current power supply and the N line of the direct-current bus, and the power supply end of the primary side of the alternating-current side current sampling photoelectric isolation Sigma-Delta modulator in series connection with the power supply end of the direct-current bus voltage sampling device, and the power supply end of the primary side of the direct-current side current sampling photoelectric isolation Sigma-Delta modulator is connected with the primary side of the direct current isolation device, and the power supply end of the direct current side sampling device is connected with the direct current side of the current sampling device.
In the above technical scheme, the phase current detection circuit comprises a phase current sampling resistor connected in series on the phase output end, wherein the phase output end adjacent to the three-phase inverter is used as the front, and the front and rear ends of the phase current sampling resistor are respectively connected with the analog input positive end and the analog input negative end of the primary side of the alternating-current side current sampling photoelectric isolation Sigma-Delta modulator after passing through the current limiting resistor.
In the above technical scheme, the power supply end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator is connected in parallel with a filter capacitor, and the other end of the filter capacitor is connected with the ground end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator.
In the above technical scheme, the number of the current limiting resistors of the power supply circuit is at least two, and the energy storage capacitor and the parallel connection point are positioned between the current limiting resistors.
In the technical scheme, a filter capacitor is connected between an analog input positive end and an analog input negative end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator in parallel.
In the above technical scheme, the power supply end of the primary side of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator is connected in parallel with a second zener diode ZD2 and a filter capacitor, and the other ends of the second zener diode ZD2 and the filter capacitor are connected with the ground end of the primary side of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator.
In the above technical scheme, the input side photoelectric isolation Sigma-Delta modulator is ACPL-797, the output side photoelectric isolation Sigma-Delta modulator is ACPL-796J, the power supply of the direct current power supply is 17V, and the voltage stabilizing voltages of the first zener diode and the second zener diode are 5V.
In the above technical scheme, the two phase current sampling resistors are connected in parallel.
In the above technical scheme, the direct current bus voltage detection circuit comprises a sampling circuit which is connected in series with the positive electrode of the bus and the ground end and is composed of a plurality of resistors, and the sampling circuit is connected with a sampling point of the sampling circuit to the positive input end of the primary side of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator, and the positive input circuit is provided with a current limiting resistor thereon, and the negative input end of the primary side of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator and the ground end are grounded.
In the above technical scheme, a filter capacitor is arranged between the analog input positive end and the analog input negative end of the primary side of the direct current side busbar voltage sampling photoelectric isolation Sigma-Delta modulator.
In the above technical solution, two phase current detection circuits corresponding to the output U-phase and the output V-phase of the inverter three-phase bridge are included.
A control method of a detection circuit of the three-phase inverter,
1) After the whole three-phase inverter is electrified, a lower bridge arm of the three-phase inverter is firstly conducted with signals, then the ground end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator corresponding to the U phase and the V phase is conducted through an N line connected to a direct current bus and grounded, an ultrafast recovery diode is conducted, and a direct current power supply supplies power to a power supply end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator and charges an energy storage capacitor;
2) A predetermined operation of starting up is performed,
3) And stopping the conduction signal of the lower bridge arm and normally driving the three-phase inverter.
The invention has the advantages and beneficial effects that:
the phase current detection and direct current bus voltage detection circuit of the three-phase inverter provided by the invention realizes detection of bus voltage and phase current based on the Sigma-Delta ADC technology, improves detection precision, and simultaneously, only uses one group of direct current power supplies for photoelectric isolation of primary side power supply voltage of a Sigma-Delta modulator, thereby improving the performance of an inverter system and reducing the system cost.
Drawings
Fig. 1 is a schematic diagram of a three-phase inverter;
Fig. 2 is a schematic diagram of a sampling structure of a three-phase inverter;
fig. 3 is a schematic diagram of a phase current detection circuit according to the present invention.
FIG. 4 is a schematic diagram of a DC bus voltage detection circuit according to the present invention;
fig. 5 is a flow chart of the inverter phase current detection and dc bus voltage detection method provided by the invention.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the person skilled in the art better understand the solution of the present invention, the following describes the solution of the present invention with reference to specific embodiments.
Example 1
The detection circuit of the three-phase inverter of the embodiment comprises a direct current bus voltage detection circuit, a phase current detection circuit and a direct current power supply, wherein the phase current detection circuit is used for detecting output of the three-phase inverter, a ground end GND1 of a primary side of a direct current bus voltage detection circuit is connected with an N line of a direct current bus, the N line of the direct current bus is connected with the ground end of the direct current power supply, an alternating current side current sampling photoelectric isolation Sigma-Delta modulator primary side is connected with a phase output end corresponding to the three-phase inverter directly, an anode of the direct current power supply is connected with a power supply end VDD1 of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator, the power supply circuit of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator comprises an ultrafast recovery diode D1 and a current limiting resistor connected with a positive electrode of the direct current power supply and an end 1 of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator in series, and a power supply end GND1 of the direct current side current sampling photoelectric isolation Sigma-Delta modulator and a power supply end GND1 of the direct current side sampling photoelectric isolation Sigma-Delta modulator is connected with a power supply end VDD1 of the direct current power supply end of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator.
The phase current detection and direct current bus voltage detection circuit of the three-phase inverter provided by the invention realizes detection of bus voltage and phase current based on the Sigma-Delta ADC technology, improves detection precision, and simultaneously, only uses one group of direct current power supplies for photoelectric isolation of primary side power supply voltage of a Sigma-Delta modulator, thereby improving the performance of an inverter system and reducing the system cost.
The power supply circuit comprises at least two current limiting resistors, such as three current limiting resistors R8, R9 and R10 which are sequentially connected in series, wherein the energy storage capacitor is connected in parallel between the current limiting resistors, such as between the current limiting resistors R8 and R9. The arrangement of a plurality of current limiting resistors is adopted, so that the current limiting of the direct current power supply and the energy storage capacitor during discharging is realized conveniently.
Example two
As a specific implementation manner, the detection circuit of the three-phase inverter includes two phase current detection circuits corresponding to the output U-phase and the output V of the three-phase bridge of the inverter, and c_u1 and c_v1 are phase output ends of the output U-phase and the output V-phase. The input side photoelectric isolation Sigma-Delta modulator is ACPL-797, the output side photoelectric isolation Sigma-Delta modulator is ACPL-796J, the power supply of the direct current power supply is 17V, and the voltage stabilizing voltages of the first Zener diode and the second Zener diode are 5V. Since the phase outputs c_u1 and c_v1 are ac outputs, these two points are not always equipotential (at some point are equipotential, at the moment V4, V5, V6 are on). The primary side DC supply ground GND1 of chips ACPL-796J must be connected to the analog input negative terminal VIN. When VIN-is used to measure two currents, VIN-of the two chips ACPL-796J are connected to the phase outputs C_U1, C_V1, respectively. If no independent power supply is adopted, the circuit structure of the invention is not adopted, and problems can occur, namely the phase output ends C_U1 and C_V1 are short-circuited with the primary side DC power supply ground end passing through ACPL-796J (because a group of DC power supplies are adopted, only one DC power supply ground end is adopted). This is not allowed. The invention realizes intermittent effective grounding and continuous power supply by utilizing the cooperation of the ultrafast recovery diode and the energy storage capacitor, solves the problems and realizes the sharing of the direct current power supply.
Taking the U-phase current sampling as an example, C_U and C_U1 are input to the analog input positive terminal VIN+ and the analog input negative terminal VIN-of the opto-isolated Sigma-Delta modulator ACPL-796J. The positive end +17V of the direct current power supply needs to be connected with an ultrafast recovery diode D1, a current limiting resistor R8R9R10 and zener diode voltage stabilizing ZD1 to 5V in series, and the primary side power supply ground end GND1 connected with the photoelectric isolation Sigma-Delta modulator ACPL-796J needs to be connected with an analog input negative end VIN-.
Specifically, the phase current detection circuit comprises phase current sampling resistors connected in series on the phase output end, and the two phase current sampling resistors are connected in parallel. And the front end and the rear end of the phase current sampling resistor are respectively connected with the analog input positive end and the analog input negative end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator after passing through the current limiting resistor.
Preferably, the power supply end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator is connected in parallel with a filter capacitor, and the other end of the filter capacitor is connected with the ground end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator. Further, a filter capacitor is connected between the positive analog input end and the negative analog input end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator in parallel. The arrangement of the plurality of filter capacitors effectively provides the overall anti-interference performance of the circuit.
The power supply end of the primary side of the direct-current side bus voltage sampling photoelectric isolation Sigma-Delta modulator is connected with a second zener diode ZD2 and a filter capacitor in parallel, and the other ends of the second zener diode ZD2 and the filter capacitor are connected with the ground end of the primary side of the direct-current side bus voltage sampling photoelectric isolation Sigma-Delta modulator. The direct current bus voltage detection circuit comprises a sampling circuit which is connected in series with the positive electrode of a bus and the ground end and consists of a plurality of resistors, such as three resistors R7, R5 and R6, and is connected with a sampling point of the sampling circuit to the analog input positive end of the primary side of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator, and the positive input circuit is provided with a current limiting resistor thereon. And a filter capacitor is arranged between the analog input positive end and the analog input negative end of the primary side of the direct-current side busbar voltage sampling photoelectric isolation Sigma-Delta modulator.
Specifically, the DC bus voltage is divided to a range of 0-200mV via a sampling resistor and input to the analog input positive terminal VIN+ and the analog input negative terminal VIN-of the opto-isolated Sigma-Delta modulator ACPL-C797. Wherein ACPL-C797 primary side power supply voltage end VDD1 is connected with a direct current voltage source +17V, and primary side power supply ground end GND1 is connected with GND of the direct current voltage source. Whereas ACPL-C797 primary supply ground GND1 must be connected to ACPL-C797 analog input negative terminal VIN-, so that in the voltage detection circuit GND of the DC voltage source is connected to dc_n of the DC bus voltage.
Example III
The invention also discloses a control method of the detection circuit of the three-phase inverter,
1) After the whole three-phase inverter is electrified, a continuous conduction signal of a lower bridge arm of the three-phase inverter is firstly provided for continuously conducting an inverter tube V4 and an inverter tube V6, if the preset time is 100us, the ground end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator corresponding to the U phase and the V phase is connected to the N line of a direct current bus and grounded, an ultrafast recovery diode is conducted, and a direct current power supply supplies power to the power supply end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator and charges an energy storage capacitor;
2) Performing start-up predetermined operations such as phase current zero calibration, and other functions;
3) After the preset time reaches or completes the initial preset operation, the conduction signal to the lower bridge arm is stopped, the three-phase inverter is normally driven, the three-phase inverter works in a PWM mode, and the C_U1 and the C_V1 can be respectively communicated with the DC_N in one switching period, so that the primary sides of the two ACPL-796J can be reliably supplied with power. When the lower bridge arm of the phase inverter is conducted, the ground end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator corresponding to the U phase and/or V phase is connected to the ground through an N line connected to a direct current bus, an ultrafast recovery diode is conducted, and a direct current power supply supplies power to the power supply end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator and charges an energy storage capacitor; when the lower bridge arm of the three-phase inverter is cut off, the ground end of the primary side of the alternating-current side current sampling photoelectric isolation Sigma-Delta modulator is disconnected and grounded, the energy storage capacitor discharges to supply power to the power supply end of the primary side of the alternating-current side current sampling photoelectric isolation Sigma-Delta modulator, and the fast recovery diode D1 can play a role in reverse blocking.
By the circuit and the principle, in the direct-current bus voltage and two-phase current detection circuit, only one group of direct-current power supplies are used for photoelectric isolation of the primary side power supply voltage of the Sigma-Delta modulator, so that the performance of an inverter system can be improved, and the system cost is reduced.
Moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (6)
1. A detection circuit of a three-phase inverter is characterized in that: the DC bus voltage detection circuit comprises a DC bus voltage detection circuit, a phase current detection circuit for detecting the output of a three-phase inverter, and a DC power supply, wherein the ground end of the primary side of a DC side bus voltage sampling photoelectric isolation Sigma-Delta modulator of the DC bus voltage detection circuit is connected with the N line of the DC bus, the N line of the DC bus is connected with the ground end of the DC power supply, the ground end of the primary side of an AC side current sampling photoelectric isolation Sigma-Delta modulator of the phase current detection circuit is directly connected with the corresponding phase output end of the three-phase inverter, the positive electrode of the DC power supply is connected with the power supply end of the primary side of the DC side bus voltage sampling photoelectric isolation Sigma-Delta modulator, the power supply circuit of the primary side of the AC side current sampling photoelectric isolation Sigma-Delta modulator comprises an ultra-fast recovery diode and a current limiting resistor which are sequentially connected between the power supply ends of the primary side of the DC power supply and the AC side current sampling photoelectric isolation Sigma-Delta modulator, the phase current detection circuit comprises a phase current sampling resistor connected in series on a phase output end, and is used for being in front of the phase output end of a three-phase inverter, and conversely, the front end and the rear end of the phase current sampling resistor are respectively connected with an analog input positive end and an analog input negative end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator after passing through the current limiting resistor, the current limiting resistors of the power supply circuit are at least two, the energy storage capacitors are connected in parallel between the current limiting resistors, a filter capacitor is connected in parallel between the positive analog input end and the negative analog input end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator,
The direct current bus voltage detection circuit comprises a sampling circuit which is connected in series with the positive electrode of the bus and the ground end and is composed of a plurality of resistors, a sampling point of the sampling circuit is connected to the positive input end of the primary side of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator, a positive input line of the current limiting resistor is arranged on the sampling point, and the negative input end and the ground end of the primary side of the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator are grounded.
2. The detection circuit of a three-phase inverter as claimed in claim 1, wherein: and the other end of the filter capacitor is connected with the ground end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator.
3. The detection circuit of a three-phase inverter as claimed in claim 1, wherein: the power supply end of the primary side of the direct-current side bus voltage sampling photoelectric isolation Sigma-Delta modulator is connected with a second zener diode ZD2 and a filter capacitor in parallel, and the other ends of the second zener diode ZD2 and the filter capacitor are connected with the ground end of the primary side of the direct-current side bus voltage sampling photoelectric isolation Sigma-Delta modulator.
4. The detection circuit of a three-phase inverter as claimed in claim 1, wherein: the direct current side bus voltage sampling photoelectric isolation Sigma-Delta modulator is ACPL-797, the alternating current side current sampling photoelectric isolation Sigma-Delta modulator is ACPL-796J, the power supply of the direct current power supply is 17V, and the regulated voltage of the first Zener diode and the second Zener diode is 5V.
5. The detection circuit of a three-phase inverter as claimed in claim 1, wherein: the phase current sampling resistor is connected in parallel.
6. A control method of the detection circuit of the three-phase inverter according to any one of claims 1 to 5, characterized in that:
1) After the whole three-phase inverter is electrified, a lower bridge arm of the three-phase inverter is firstly conducted with signals, then the ground end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator corresponding to the U phase and the V phase is conducted through an N line connected to a direct current bus and grounded, an ultrafast recovery diode is conducted, and a direct current power supply supplies power to a power supply end of the primary side of the alternating current side current sampling photoelectric isolation Sigma-Delta modulator and charges an energy storage capacitor;
2) A predetermined operation of starting up is performed,
3) And stopping the conduction signal of the lower bridge arm and normally driving the three-phase inverter.
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|---|---|
| CN108490293A (en) | 2018-09-04 |
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