CN112511026B - H-bridge inverter system and dead zone compensation device thereof - Google Patents
H-bridge inverter system and dead zone compensation device thereof Download PDFInfo
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- CN112511026B CN112511026B CN202011225236.7A CN202011225236A CN112511026B CN 112511026 B CN112511026 B CN 112511026B CN 202011225236 A CN202011225236 A CN 202011225236A CN 112511026 B CN112511026 B CN 112511026B
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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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
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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
-
- 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
- H02M7/53873—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 digital control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an H-bridge inverter system and a dead zone compensation device thereof. The dead zone compensation device suitable for H bridge contravariant, it includes: the current detection unit is used for sampling the inductive current of the H-bridge inverter; a control module generating a target duty cycle based on the sampling current and a preset reference current value; the dead zone compensation module is used for retrieving the maximum value and the minimum value in the sampling current for N times, taking the retrieved maximum value and the retrieved minimum value in the sampling current as judgment quantities and outputting corresponding duty ratio compensation quantity delta duty; and the PWM signal output module is used for superposing the target duty ratio duty and the duty ratio compensation quantity delta duty so as to correct the target duty ratio duty and output a PWM signal with a corrected duty ratio to drive the H-bridge inverter. In this way, dead-time compensation of the H-bridge inverter can be achieved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of dead zone compensation of H-bridge inversion, in particular to an H-bridge inversion system and a dead zone compensation device thereof.
[ background of the invention ]
In a bridge circuit using bipolar modulation, in order to prevent a power tube of the same bridge arm from being directly connected, a dead time is reserved in the switching process. The dead time ensures reliable operation of the power device, but also reduces the output power quality. In order to reduce the influence of dead zone on the output power quality, corresponding measures for adding dead zone compensation are required, some existing compensation schemes need to add extra hardware circuits,
therefore, a dead zone compensation measure that does not require an additional hardware circuit is necessary.
[ summary of the invention ]
The invention aims to provide an H-bridge inverter system and a dead-zone compensation device thereof, which can not only perform dead-zone compensation on H-bridge inversion, but also do not need to add an additional hardware circuit.
In order to solve the above problems, according to a first aspect of the present invention, there is provided a dead zone compensation device suitable for H-bridge inversion, comprising: the current detection unit is used for sampling the inductive current of the H-bridge inverter and outputting a sampling current reflecting the inductive current; the control module generates a target duty ratio duty based on the sampling current received by the input end of the control module and a preset reference current value, and outputs the target duty ratio duty through the output end of the control module; the dead zone compensation module is used for retrieving the maximum value and the minimum value in the sampling current received by the input end of the dead zone compensation module for N times, taking the retrieved maximum value and the retrieved minimum value in the sampling current as judgment quantities, and outputting corresponding duty ratio compensation quantity delta duty, wherein N is a natural number greater than 1; and the input end of the PWM signal output module is connected with the output end of the control module and the output end of the dead zone compensation module, and the PWM signal output module is used for superposing the target duty ratio duty and the duty ratio compensation quantity delta duty so as to correct the target duty ratio duty and output a PWM signal after duty ratio correction to drive the H-bridge inverter.
According to a second aspect of the present invention, there is provided an H-bridge inverter system comprising: an H-bridge inverter and a dead-time compensation device. The dead zone compensation device includes: the current detection unit is used for sampling the inductive current of the H-bridge inverter and outputting the sampling current reflecting the inductive current; the control module generates a target duty ratio duty based on the sampling current received by the input end of the control module and a preset reference current value, and outputs the target duty ratio duty through the output end of the control module; the dead zone compensation module is used for retrieving the maximum value and the minimum value in the sampling current for N times received by the input end of the dead zone compensation module, taking the retrieved maximum value and minimum value in the sampling current as judgment quantities and outputting corresponding duty ratio compensation quantity delta duty, wherein N is a natural number greater than 1; and the input end of the PWM signal output module is connected with the output end of the control module and the output end of the dead zone compensation module, and the PWM signal output module is used for superposing the target duty ratio duty and the duty ratio compensation quantity delta duty so as to correct the target duty ratio duty and output a PWM signal after duty ratio correction to drive the H-bridge inverter.
Compared with the prior art, the H-bridge inverter system and the dead-zone compensation device thereof can realize the dead-zone compensation of the H-bridge inverter.
Other objects, features and advantages of the present invention will be described in detail in the following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings.
[ description of the drawings ]
The present invention will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:
FIG. 1 is a schematic circuit diagram of an H-bridge inverter system with dead-time compensation according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of dead zone generation;
FIG. 3 is a schematic diagram comparing ideal current and actual current output by an H-bridge inverter without dead-zone compensation in one embodiment; and
FIG. 4 is a flow diagram of the operation of the deadband compensation module of FIG. 1 in one embodiment.
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least an implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. The terms "plurality" or "a plurality" in the present invention mean two or more. "and/or" in the present invention means "and" or ".
Fig. 1 is a circuit diagram of an H-bridge inverter system capable of performing dead-zone compensation according to an embodiment of the present invention. The H-bridge inverter system shown in fig. 1 includes an H-bridge inverter 110 and a dead-band compensation device (not identified).
The topological structure of the H-bridge inverter 110 is shown in fig. 1, where Vdc is bus voltage (or dc-side voltage), and Cdc is a bus capacitor (or dc-side filter and energy storage capacitor); l1 and L2 are inverter inductors, Cf is a filter capacitor, V1-V4 are power tubes (or power switches), and D1-D4 are diodes; S1-S4 are H bridge driving signals to respectively control the on and off of the power tubes V1-V4; vg is the mains voltage and is connected to both ends L and N.
As described in the foregoing background, in order to prevent the power transistors of the same bridge arm from being turned on, a dead time is reserved in the switching process. Please refer to fig. 2, which is a timing diagram of the S1-S4 driving signals with dead time generated based on the PWM signal with Duty _ Ideal in one embodiment, wherein Td is the set dead time and Ts is the driving switching period of the power transistor. The dead time ensures reliable operation of the power device, but also reduces the output power quality, please refer to fig. 3, which is a schematic diagram showing comparison between an ideal current and an actual current output by the H-bridge inverter without dead time compensation in one embodiment, the actual current is an equivalent average value of a sampling value of a switching period, and it can be confirmed that an error part of the actual current caused by the dead time is a stage in which the dead time compensation needs to be added.
Referring to fig. 1, the dead-time compensation apparatus of the present invention includes a current detection unit 120, a CLA (Control Law Accelerator coprocessor) 130, a Control module 140, a dead-time compensation module 150, and a PWM (Pulse width modulation) signal output module 160. The CLA (Control Law Accelerator co-processor) 130, the Control module 140, the dead zone compensation module 150, and the PWM (Pulse width modulation) signal output module 160 are located in a DSP (digital signal processor).
The current detection unit 120 is configured to sample an inductor current of the H-bridge inverter 110 and output a sampled current (or a sampled current signal) reflecting the inductor current. In the specific embodiment shown in fig. 1, the current detection unit 120 is an AC HCT (i.e., an alternating hall current sensor); the sampling manner of the current detection unit 120 may be AD sampling (i.e., analog-to-digital sampling).
The input end of the CLA is connected to the output end of the current detection unit 120, the output end of the CLA is connected to the input end of the control module 140 and the input end of the dead-zone compensation module 150, and the CLA is configured to process the sampling current received by the input end of the CLA and output the processed sampling current to the control module 140 and the dead-zone compensation module 150 through the output end of the CLA.
The control module 140 generates a target duty ratio duty of the PWM signal based on the sampling current received at its input terminal and a preset reference current value, and outputs the target duty ratio duty through its output terminal, wherein the duty ratio is a ratio of the power-on time to the total time in one pulse cycle.
The dead-zone compensation module 150 is configured to retrieve a maximum value and a minimum value of N times of current sampling currents received by an input end of the dead-zone compensation module, and output a corresponding duty compensation amount Δ duty by using the retrieved maximum value and minimum value of the current sampling currents as a determination amount, so as to achieve the purpose of dead-zone compensation, where N is a natural number greater than 1.
Referring now to fig. 4, a software flow diagram (or workflow diagram) of the dead band compensation module 150 of fig. 1 in one embodiment is shown. In the embodiment shown in FIG. 4, the software flow of the dead band compensation module 150 includes the following steps.
And step 420, acquiring the minimum value of the N times of sampling currents provided by the CLA, and recording the minimum value as the current sampling current recording minimum value. In the embodiment shown in fig. 4, where N is 16, the minimum of 16 current samples provided by the CLA may be obtained by using a selective sorting method.
And step 430, acquiring the maximum value of the N times of sampling currents provided by the CLA, and recording the maximum value as the current sampling current recording maximum value. In the embodiment shown in fig. 4, where N is 16, the maximum of 16 current sample values provided by the CLA may be obtained by using the selective sorting method.
When the duty compensation amount Δ duty is Td/Ts or-Td/Ts, Td is a dead time set to prevent the same bridge arm power tubes (e.g., power switches V1, V2 in the left bridge arm, and power switches V3, V4 in the right bridge arm) in the H-bridge inverter 110 from going through; ts is the drive switching period of power tubes V1-V4 in H-bridge inverter 110.
As shown in fig. 1, an input end of the PWM signal output module 160 is connected to output ends of the control module 140 and the dead zone compensation module 150, and the PWM signal output module 160 superimposes the target duty cycle output by the control module 140 and the duty compensation amount Δ duty output by the dead zone compensation module 140 to correct (or dead zone compensate) the target duty cycle and output a PWM signal with the corrected duty cycle, so as to finally drive the H-bridge inverter 110.
To sum up, the dead zone compensation device of the present invention includes: the current detection unit is used for sampling the inductive current of the H-bridge inverter and outputting a sampling current reflecting the inductive current; the control module generates a target duty ratio duty based on the sampling current received by the input end of the control module and a preset reference current value, and outputs the target duty ratio duty through the output end of the control module; the dead zone compensation module is used for retrieving the maximum value and the minimum value in the sampling current for N times received by the input end of the dead zone compensation module, taking the retrieved maximum value and minimum value in the sampling current as judgment quantities and outputting corresponding duty ratio compensation quantity delta duty, wherein N is a natural number greater than 1; and the input end of the PWM signal output module is connected with the output ends of the control module and the dead zone compensation module, and the PWM signal output module is used for superposing the target duty ratio duty and the duty ratio compensation quantity delta duty so as to correct the target duty ratio duty and output a PWM signal after duty ratio correction to drive the H-bridge inverter. Therefore, the dead-zone compensation is realized on the existing hardware platform through software, and an additional hardware compensation circuit is not needed.
In the present invention, the terms "connected", "connecting", and the like mean electrically connected or communicatively connected, directly or indirectly, unless otherwise specified. As used herein, "coupled" refers to indirect or direct electrical connections, which may be through one or more electrical devices (e.g., resistors, capacitors, inductors, etc.).
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art will be able to make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims should not be limited to the description of the embodiments contained herein.
Claims (8)
1. A dead-time compensation device suitable for H-bridge inversion is characterized by comprising:
the current detection unit is used for sampling the inductive current of the H-bridge inverter and outputting a sampling current reflecting the inductive current;
the control module generates a target duty ratio duty based on the sampling current received by the input end of the control module and a preset reference current value, and outputs the target duty ratio duty through the output end of the control module;
the dead zone compensation module is used for retrieving the maximum value and the minimum value in the sampling current for N times received by the input end of the dead zone compensation module, taking the retrieved maximum value and minimum value in the sampling current as judgment quantities and outputting corresponding duty ratio compensation quantity delta duty, wherein N is a natural number greater than 1;
a PWM signal output module, the input end of which is connected with the output end of the control module and the output end of the dead zone compensation module, and which is used for superposing the target duty ratio duty and the duty ratio compensation quantity delta duty so as to correct the target duty ratio duty and outputting a PWM signal with corrected duty ratio to drive the H-bridge inverter,
the working process of the dead zone compensation module comprises the following steps:
acquiring the minimum value of the N times of sampling currents, and recording the minimum value as the current sampling current recording minimum value;
acquiring the maximum value of the N times of sampling currents, and recording the maximum value as the current sampling current recording maximum value;
judging whether the current sampling current recording minimum value is greater than 0, if so, enabling the duty ratio compensation quantity delta duty output by the dead zone compensation module to be Td/Ts; if not, enabling the duty ratio compensation quantity delta duty output by the dead zone compensation module to be 0;
judging whether the current sampling current recording maximum value is less than 0, if so, enabling the duty ratio compensation quantity delta duty output by the dead zone compensation module to be-Td/Ts; if not, the duty ratio compensation quantity delta duty output by the dead zone compensation module is made to be 0,
wherein Td is a set dead time; ts is the driving switching period of the power tube in the H-bridge inverter,
the number of N times is 16 times.
2. The dead-time compensation device suitable for H-bridge inversion of claim 1, further comprising an integrated control law accelerator coprocessor for processing the sampled current output by the current detection unit,
the sampling current output by the current detection unit is processed by the integrated control law accelerator coprocessor and is connected with the input end of the control module;
and the sampling current output by the current detection unit is processed by the integrated control law accelerator coprocessor and is connected with the input end of the dead-time compensation module.
3. The deadband compensation arrangement for an H-bridge inverter of claim 1, wherein the operation of the deadband compensation module further comprises:
and initially assigning a value to the dead zone compensation module before acquiring the minimum value of the sampling current for N times and the maximum value of the sampling current for N times.
4. The dead-time compensation device for H-bridge inversion according to claim 3,
and when the dead zone compensation module is initially assigned, the minimum value of the current sampling current record is assigned to be 0, and the maximum value of the current sampling current record is assigned to be the range value of the analog-to-digital converter.
5. The dead-zone compensation apparatus for H-bridge inversion according to claim 1,
obtaining the minimum value of the sampling current for N times by adopting a selection sorting method;
and acquiring the maximum value of the sampling current for N times by adopting a selection sorting method.
6. The dead-time compensation device for H-bridge inversion according to claim 1,
the current detection unit is a Hall current sensor;
the sampling mode of the current detection unit is analog-digital sampling.
7. The dead-zone compensation device for H-bridge inversion according to claim 2,
the integrated control law accelerator coprocessor, the control module, the dead zone compensation module and the PWM signal output module are positioned in the digital signal processor.
8. An H-bridge inverter system, comprising:
an H-bridge inverter;
the H-bridge inverted dead-time compensation apparatus as set forth in any one of claims 1 to 7.
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| CN113612381B (en) * | 2021-07-21 | 2023-02-10 | 深圳数马电子技术有限公司 | Dead zone compensation method, dead zone compensation device, motor driver and storage medium |
| CN115967294B (en) * | 2023-03-16 | 2023-05-23 | 哈尔滨工业大学 | Inverter digital closed-loop modulation method |
| CN117914108B (en) * | 2024-03-07 | 2024-05-28 | 江苏康众数字医疗科技股份有限公司 | Arbitrary current generation system and method based on H-bridge state feedback |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1905339A (en) * | 2006-07-31 | 2007-01-31 | 湖南大学 | Compensating method for active power filter inverter harmonic domain dead zone effect |
| CN110545033A (en) * | 2018-05-28 | 2019-12-06 | 株洲中车时代电气股份有限公司 | method and system for compensating dead zone in inverter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1905339A (en) * | 2006-07-31 | 2007-01-31 | 湖南大学 | Compensating method for active power filter inverter harmonic domain dead zone effect |
| CN110545033A (en) * | 2018-05-28 | 2019-12-06 | 株洲中车时代电气股份有限公司 | method and system for compensating dead zone in inverter |
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