CN113067465A - Negative resistance based on DSP control - Google Patents
Negative resistance based on DSP control Download PDFInfo
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- CN113067465A CN113067465A CN202110465762.9A CN202110465762A CN113067465A CN 113067465 A CN113067465 A CN 113067465A CN 202110465762 A CN202110465762 A CN 202110465762A CN 113067465 A CN113067465 A CN 113067465A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
Abstract
The invention discloses a negative resistor based on DSP control, which comprises a direct current voltage source, a full-bridge inverter circuit, a current sampling module, a DSP controller and a switch tube driving module which are connected in sequence; the full-bridge inverter circuit comprises 4 semiconductor power switching tubes; the DSP controller comprises a CAP module, a first PWM module and a second PWM module; the first PWM module generates 2 square wave control signals PWMA1 and PWMB 1; the second PWM module generates 2 paths of square wave control signals PWMA2 and PWMB 2; the switching tube driving module respectively generates 4 paths of switching tube driving signals according to square wave control signals PWMA1, PWMB1, PWMA2 and PWMB 2; the 4 paths of switch tube driving signals and the switch tube driving signals respectively control the on and off of the 4 semiconductor power switch tubes so as to realize the control of the output voltage phase and the effective value of the full-bridge inverter circuit. Under the condition that the input voltage at the direct current side is fixed, the invention can realize the flexible control of the effective value of the output voltage of the full-bridge inverter circuit by changing the duty ratio of the output voltage of the full-bridge inverter circuit.
Description
Technical Field
The invention relates to the technical field of negative resistance construction, in particular to a negative resistance based on DSP control.
Background
The negative resistance is a one-port active element which satisfies ohm's law, and is characterized in that when an associated reference direction is selected, the phases of the voltage at two ends of the negative resistance and the flowing current are opposite, and active power is output outwards. The existing negative resistance construction methods mainly comprise two methods: one is based on an operational amplifier and a positive resistance; and the other is an inverter circuit based on self-oscillation control. The former is limited by the saturation voltage of the operational amplifier, the output active power is limited, and the inverter is only suitable for small-power occasions, the latter directly generates a switching tube driving signal through a zero-crossing comparator, the duty ratio of the output voltage of the inverter circuit is always equal to 0.5, and the adjustment of the size of the output voltage of the inverter circuit can be realized only by changing the voltage on the direct current side of the inverter circuit through cascading a DC-DC converter at the front end of the inverter circuit, but the cost and the volume of the system are increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a negative resistor based on DSP control, a driving signal of a switching tube of an inverter circuit is generated through synchronous and phase-shift control, the inverter circuit is only utilized, and the control of the output voltage and the phase of the inverter circuit is realized.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a negative resistance based on DSP control comprises a direct current voltage source, a full-bridge inverter circuit, a current sampling module, a DSP controller and a switch tube driving module; the direct current voltage source is connected with the full-bridge inverter circuit; the full-bridge inverter circuit comprises 4 semiconductor power switching tubes Q1、Q2、Q3、Q4(ii) a The current sampling module samples the output current of the full-bridge inverter circuit and generates a square wave signal which has the same phase and the same frequency as the output current of the full-bridge inverter circuit; the DSP controller comprises a CAP module (namely a pulse capture module), a first PWM module (namely a first pulse width modulation module) and a second PWM module (namely a second pulse width modulation module); the CAP module captures the rising edge of the square wave signal generated by the current sampling module, acquires the phase and the frequency of the output current of the full-bridge inverter circuit in real time, and generates a synchronous signal of the first PWM module when the CAP module captures the rising edge of the square wave signal; the first PWM module generates 2 square wave control signals PWMA1 and PWMB 1; the second PWM module generates 2 square wave control signals PWMA2 and PWMB 2; the switching tube driving module respectively generates 4 paths of switching tube driving signals V according to square wave control signals PWMA1, PWMB1, PWMA2 and PWMB2GS1、VGS2、VGS3、VGS4(ii) a The switch tube driving signal VGS1、VGS2、VGS3、VGS4Respectively controlling switch tubes Q1、Q2、Q3And Q4Turn on and turn off; the fundamental component phase place of full-bridge inverter circuit output voltage is the same with its output current's fundamental component phase place, full-bridge inverter circuit output voltage's duty cycle is adjustable, and the port characteristic of whole circuit can be equivalent to the negative resistance.
Further, the first PWM module includes a first period counter and a first time base counter, the second PWM module includes a second period counter and a second time base counter, values of the first period counter and the second period counter are always equal to a period value PRD of an output current of the full-bridge inverter circuit, and the period value PRD of the output current of the full-bridge inverter circuit satisfies: PRD ═ TS/TCLKWherein T isSIndicating the period of the output current of the full-bridge inverter circuit, TCLKRepresenting the clock period of the PWM module of the DSP controller; the first and second time-based counters are configured in a down mode in which the first and second time-based counters first load the values of the first and second periodic counters and then begin decrementing down until they decrement to 0, automatically reload the values of the first and second periodic counters and repeat the above acts; when the value of the first time base counter equals the value of the first period counter, the square wave control signal PWMA1 is asserted high and the square wave control signal PWMB1 is asserted low, and when the value of the first time base counter equals the value of 1/2 the first period counter, the square wave control signal PWMA1 is asserted low and the square wave control signal PWMB1 is asserted high; when the value of the second time base counter equals the value of the second period counter, the square wave control signal PWMA2 is asserted high and the square wave control signal PWMB2 is asserted low, and when the value of the second time base counter equals the value of 1/2 the second period counter, the square wave control signal PWMA2 is asserted low and the square wave control signal PWMB2 is asserted high; and when the value of the first time base counter is reduced to 0, generating a synchronous signal of a second PWM module.
Further, when the synchronization signal of the PWM module arrives, the value of the first time-based counter is updated to be phase 1 immediately, and when the synchronization signal of the second PWM module arrives, the value of the second time-based counter is updated to be phase 2 immediately, where phase 1 and phase 2 satisfy the following relationship:
wherein D isSAnd represents the duty ratio of the output voltage of the full-bridge inverter circuit.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention is based on a power electronic converter, and can realize negative resistance of any power level.
2. Through synchronous and phase-shift control, the negative resistance with adjustable output voltage is realized only by using an inverter circuit, and the negative resistance voltage regulator has the characteristics of simple structure, low cost, small volume and high efficiency.
In a word, the negative resistance based on the DSP control disclosed by the invention can realize the flexible control of the effective value of the output voltage of the full-bridge inverter circuit by changing the duty ratio of the output voltage of the full-bridge inverter circuit under the condition that the input voltage at the direct current side is fixed, and has obvious advantages in practical application.
Drawings
Fig. 1 is a block diagram of a negative resistance based on DSP control according to an embodiment.
Fig. 2 is a schematic diagram of the switching tube driving signal generation shown in fig. 1 according to the embodiment.
Fig. 3 is a block diagram of a series-series wireless power transmission system based on the proposed negative resistance in an embodiment.
Fig. 4 is a steady-state waveform diagram of the output voltage and the output current of the inverter circuit shown in fig. 3 according to the embodiment.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
As shown in fig. 1, the present embodiment discloses a negative resistance based on DSP control, which includes a dc voltage source, a full-bridge inverter circuit, a current sampling module, a DSP controller, and a switching tube driving module; the direct current voltage source is connected with the full-bridge inverter circuit; the full-bridge inverter circuit comprises 4 semiconductor power switching tubes Q1、Q2、Q3、Q4(ii) a The current sampling module samples the output current of the full-bridge inverter circuit and generates a square wave signal which has the same phase and the same frequency as the output current of the full-bridge inverter circuit; the DSP controller comprises a CAP module (namely a pulse capture module), a first PWM module (namely a first pulse width modulation module) and a second PWM module (namely a second pulse width modulation module); the first PWM module comprises a first period counter and a first time base counter, the second PWM module comprises a second period counter and a second time base counter, and the values of the first period counter and the second period counter are always equal to the period value PRD of the current output by the full-bridge inverter circuit; the CAP module captures the rising edge of the square wave signal generated by the current sampling module, acquires the phase and the frequency of the output current of the full-bridge inverter circuit in real time, and generates a synchronous signal of the first PWM module when the CAP module captures the rising edge of the square wave signal; the first PWM module generates 2 square wave control signals PWMA1 and PWMB 1; the second PWM module generates 2 square wave control signals PWMA2 and PWMB 2; the switching tube driving module respectively generates 4 paths of switching tube driving signals V according to square wave control signals PWMA1, PWMB1, PWMA2 and PWMB2GS1、VGS2、VGS3、VGS4(ii) a The switch tube driving signal VGS1、VGS2、VGS3、VGS4Respectively controlling switch tubes Q1、Q2、Q3And Q4Turn on and turn off; the fundamental component of the output voltage and the fundamental component of the output current of the inverter circuit are always kept in the same phase, and the port characteristic of the whole circuit can be equivalent to negative resistance-RN。
In the present embodiment, the specific generation process of the square wave control signal and the switching tube driving signal is as shown in fig. 2. Firstly, a CAP module of a DSP controller captures square waves generated by a sampling moduleSignal i'PThe DSP controller calculates the frequency of the output current of the inverter circuit according to the captured rising edge of the square wave signal, and updates the values PRD (PRD ═ T) of the first period counter and the second period counter in real timeS/TCLKWherein T isSIndicating the period of the output current of the full-bridge inverter circuit, TCLKRepresenting the clock period of the PWM module of the DSP controller) while generating the synchronization signal S of the first PWM module when the rising edge of the square wave signal arrivesn1. The first and second PWM modules are configured in a down mode in which timebase counter 1 and timebase counter 2 first load the values of the first and second cycle counters and then begin decrementing down until subtracting to 0, automatically reloading the values of the first and second cycle counters and repeating the above actions. As shown in fig. 2, when the value CTR1 of the time base counter 1 is equal to the value of the first period counter, the square wave control signal PWMA1 is set high and the square wave control signal PWMB1 is set low, when the value CTR of the time base counter 1 is equal to the value 1/2 of the first period counter, the square wave control signal PWMA1 is set low and the square wave control signal PWMB1 is set high, and when the value CTR of the time base counter 1 is reduced to 0, the synchronization signal S of the second PWM module is generatedn2. The square wave control signals PWMA2 and PWMB2 are produced on the same principle as PWMA1 and PWMB1, when the value CTR2 of the base counter 2 equals the value of the second period counter, the square wave control signal PWMA2 is set high and the square wave control signal PWMB2 is set low, when the value CTR2 of the base counter 2 equals the value of the second period counter 1/2, the square wave control signal PWMA2 is set low and the square wave control signal PWMB2 is set high.
When the synchronous signal S of the first PWM modulen1When the time comes, the value CTR of the time-base counter 1 is immediately updated to Pha1 when the synchronization signal S of the second PWM modulen1At the time of arrival, the value CTR2 of said timebase counter 2 is immediately updated to Pha2, where Pha1 and Pha2 satisfy:
wherein D isSRepresenting the inverse of a full bridgeThe duty ratio of the output voltage of the variable circuit.
To further illustrate the advantages of the present invention, in the present embodiment, the proposed negative resistance is used in a series-series type wireless power transmission system, and its functional block diagram is shown in fig. 3, where V isdcRepresenting the voltage of a DC voltage source, LPAnd LSRespectively representing the inductance of the transmitter coil and the inductance of the receiver coil, CPAnd CSRespectively representing the transmitting and receiving end capacitances, RSAnd RPIndicating the internal resistances of the transmitting and receiving coils, MPSRepresenting the mutual inductance between the coils, RLRepresenting the load value. The corresponding inverter circuit output voltage and output current waveforms in circuit steady state are shown in FIG. 4, where vacIndicating the output voltage, v, of the inverter circuitac1Representing the fundamental component of the output voltage of the inverter circuit, its effective value Vac1The following relationship is satisfied:
it can be seen from fig. 4 that the fundamental component of the output voltage and the fundamental component of the output current of the inverter circuit are kept in phase.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. A negative resistance based on DSP control characterized in that: the device comprises a direct current voltage source, a full-bridge inverter circuit, a current sampling module, a DSP controller and a switching tube driving module; the direct current voltage source is connected with the full-bridge inverter circuit; the full-bridge inverter circuit comprises 4 semiconductor power switching tubes Q1、Q2、Q3、Q4(ii) a The current sampling module samples the output current of the full-bridge inverter circuit to generate the phase of the output current of the full-bridge inverter circuitSquare wave signals with the same frequency; the DSP controller comprises a CAP module, a first PWM module and a second PWM module; the CAP module captures the rising edge of the square wave signal generated by the current sampling module, acquires the phase and the frequency of the output current of the full-bridge inverter circuit in real time, and generates a synchronous signal of the first PWM module when the CAP module captures the rising edge of the square wave signal; the first PWM module generates 2 square wave control signals PWMA1 and PWMB 1; the second PWM module generates 2 square wave control signals PWMA2 and PWMB 2; the switching tube driving module respectively generates 4 paths of switching tube driving signals V according to square wave control signals PWMA1, PWMB1, PWMA2 and PWMB2GS1、VGS2、VGS3、VGS4(ii) a The switch tube driving signal VGS1、VGS2、VGS3、VGS4Respectively controlling switch tubes Q1、Q2、Q3And Q4Turn on and turn off; the fundamental component phase place of full-bridge inverter circuit output voltage is the same with its output current's fundamental component phase place, full-bridge inverter circuit output voltage's duty cycle is adjustable, and the port characteristic of whole circuit can be equivalent to the negative resistance.
2. The DSP control-based negative resistance of claim 1, wherein: the first PWM module comprises a first period counter and a first time base counter, the second PWM module comprises a second period counter and a second time base counter, the values of the first period counter and the second period counter are always equal to the period value PRD of the output current of the full-bridge inverter circuit, and the period value PRD of the output current of the full-bridge inverter circuit meets the following requirements: PRD ═ TS/TCLKWherein T isSIndicating the period of the output current of the full-bridge inverter circuit, TCLKRepresenting the clock period of the PWM module of the DSP controller; the first and second time-based counters are configured in a down mode in which the first and second time-based counters first load the values of the first and second cycle counters and then begin decrementing down until they decrement to 0, automatically reloading the first and second cycle countersThe value of the counter, and repeat the above actions; when the value of the first time base counter equals the value of the first period counter, the square wave control signal PWMA1 is asserted high and the square wave control signal PWMB1 is asserted low, and when the value of the first time base counter equals the value of 1/2 the first period counter, the square wave control signal PWMA1 is asserted low and the square wave control signal PWMB1 is asserted high; when the value of the second time base counter equals the value of the second period counter, the square wave control signal PWMA2 is asserted high and the square wave control signal PWMB2 is asserted low, and when the value of the second time base counter equals the value of 1/2 the second period counter, the square wave control signal PWMA2 is asserted low and the square wave control signal PWMB2 is asserted high; and when the value of the first time base counter is reduced to 0, generating a synchronous signal of a second PWM module.
3. A DSP-controlled negative resistance according to claim 2, wherein: when the synchronization signal of the PWM module arrives, the value of the first time-based counter is updated to Pha1 immediately, and when the synchronization signal of the second PWM module arrives, the value of the second time-based counter is updated to Pha2 immediately, where Pha1 and Pha2 satisfy the following relationship:
wherein D isSAnd represents the duty ratio of the output voltage of the full-bridge inverter circuit.
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| CN202110465762.9A CN113067465B (en) | 2021-04-28 | 2021-04-28 | Negative resistance based on DSP control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422443A (en) * | 2021-07-26 | 2021-09-21 | 大连海事大学 | Magnetic adsorption type underwater wireless power supply system with multiple cascaded transmitting and receiving coils |
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| CN215580889U (en) * | 2021-04-28 | 2022-01-18 | 华南理工大学 | Negative resistance based on DSP control |
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2021
- 2021-04-28 CN CN202110465762.9A patent/CN113067465B/en active Active
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|---|---|---|---|---|
| WO2004001942A1 (en) * | 2002-06-23 | 2003-12-31 | Powerlynx A/S | Power converter |
| CN102856916A (en) * | 2012-04-10 | 2013-01-02 | 北京昆兰新能源技术有限公司 | Reactive power control method and circuit of single-phase photovoltaic inverter |
| CN109149979A (en) * | 2018-09-13 | 2019-01-04 | 华南理工大学 | A kind of high-power voltage-controlled type negative resistance for resonance circuit |
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| Title |
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| CN113422443A (en) * | 2021-07-26 | 2021-09-21 | 大连海事大学 | Magnetic adsorption type underwater wireless power supply system with multiple cascaded transmitting and receiving coils |
| CN113422443B (en) * | 2021-07-26 | 2024-02-02 | 大连海事大学 | Magnetic adsorption type underwater wireless power supply system with multiple transmitting and receiving coils in cascade connection |
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