CN115208326A - ZVS (zero voltage switching) type digital power amplifier based on H-bridge topology - Google Patents

ZVS (zero voltage switching) type digital power amplifier based on H-bridge topology Download PDF

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CN115208326A
CN115208326A CN202210845656.8A CN202210845656A CN115208326A CN 115208326 A CN115208326 A CN 115208326A CN 202210845656 A CN202210845656 A CN 202210845656A CN 115208326 A CN115208326 A CN 115208326A
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module
resistor
duty ratio
voltage
bridge
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黄银国
李少琦
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Tianjin University
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Tianjin University
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/351—Pulse width modulation being used in an amplifying circuit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention relates to aThe ZVS (zero voltage switching) switch type digital power amplifier based on the H-bridge topology comprises a direct-current stabilized power supply module, a bridge type chopping module, a transformer isolation module, an output rectifying and filtering module, a control module, a duty ratio loss compensation module, a switch tube driving module and an auxiliary power supply. The duty ratio loss compensation module is used for pre-distorting the externally input signal to be amplified so as to compensate the duty ratio loss problem of the H-bridge circuit, and the output of the duty ratio loss compensation module is connected to the PWM modulator of the control module; the duty ratio loss compensation module comprises an addition circuit for U 1 、U 2 Doing an addition operation, U 1 For external input of signals, U 2 For distorted voltages with the same monotonicity as the external input signal, U 2 The distortion voltage, which has the same monotonicity as the input signal, is superimposed on the external input signal after passing through the addition circuit. The invention has the characteristics of high efficiency, excellent performance and small distortion.

Description

ZVS (zero voltage switching) type digital power amplifier based on H-bridge topology
Technical Field
The invention relates to the field of digital power amplifiers, in particular to a high-efficiency low-distortion switching type ZVS (zero voltage switching) power amplifier.
Background
According to different working areas of power devices, power amplifiers are divided into analog power amplifiers and digital power amplifiers, the analog power amplifiers are divided into a class A, a class B and a class AB according to different static working points, and the digital power amplifiers mainly refer to a class D and are also called switching power amplifiers. The analog power amplifier works in a linear amplification region of a switching device, the efficiency is low due to high loss, the improvement of the power level is limited, and with the development of power electronic technology, the digital power amplifier adopting a fully-controlled switching device works in a cut-off region and a saturation region, so that the loss is low, the efficiency is high, the digital power amplifier is suitable for high-power application occasions, and the analog power amplifier is gradually replaced.
In the field of DCDC converters, the switching loss of a power field effect transistor is further reduced by a resonant soft switching technology, and the principle of the DCDC soft switching converter is that a resonant network is formed by using a parasitic capacitor of a switching tube, a resonant inductor and the like, so that current and voltage are not overlapped when the states of the switching tube are switched, for example, an H-bridge network phase-shift control DCDC soft switching converter is used, and resonance is performed by using the resonant inductor and the parasitic capacitor of the switching tube, so that the voltages at two ends of the switching tube are zero when the states of the switching tube are switched, that is, ZVS switching is realized, and the efficiency of the converter is further improved.
Based on the advantages of the digital power amplifier, the ZVS switching type digital power amplifier based on the H-bridge topology is designed, compared with the traditional digital power amplifier, the design keeps the soft switching technology in the DCDC field, the efficiency is further improved, in addition, aiming at the duty ratio loss problem caused by the resonant inductance in the soft switching technology, in order to overcome the distortion generated by the duty ratio loss compensation module, the ZVS switching type digital power amplifier is designed for compensating the soft switching technology.
Disclosure of Invention
The ZVS switch type digital power amplifier based on the H-bridge topology has the characteristics of high efficiency, high quality and small distortion, and can make up for the vacancy of the related technology. The technical scheme is as follows:
a ZVS (zero voltage switching) switch type digital power amplifier based on an H-bridge topology comprises a direct-current stabilized power supply module, a bridge type chopping module, a transformer isolation module, an output rectifying and filtering module, a control module, a switch tube driving module and an auxiliary power supply, wherein the control module is used for generating switch tube on-off control instructions through a PWM (pulse width modulation) modulator according to external input signals; the switching tube driving module is used for driving the switching tube of the bridge type chopping module to be switched on and off according to the switching-on and switching-off instructions of the control module, and chopping the voltage provided by the direct-current stabilized power supply into positive and negative pulse voltages with duty ratios modulated by input signals; positive and negative pulse voltages generated by the bridge chopping module are isolated by a transformer and are sent to the output rectifying and filtering module; an output rectifying and filtering module for rectifying the positive and negative pulse voltage into square wave voltage, which becomes a high-power output signal after high-frequency components are filtered out by LC low-pass filtering,
a duty cycle loss compensation module is also included. The duty ratio loss compensation module is used for pre-distorting an externally input signal to be amplified so as to compensate the duty ratio loss problem of the H-bridge circuit, and the output of the duty ratio loss compensation module is connected to the PWM modulator of the control module; the duty ratio loss compensation module comprises an addition circuit for U 1 、U 2 Doing an addition operation, U 1 For external input of signals, U 2 For distorted voltages with the same monotonicity as the external input signal, U 2 As having the same as the input signalThe monotonous distortion voltage is superposed on an external input signal after passing through the addition circuit.
Preferably, the voltage between the input end of the duty loss compensation module and the ground end is divided by a constant value resistor R4 and a variable resistor R5, and the divided voltage is U 2 The magnitude of the distortion voltage is adjusted by adjusting the variable resistor R5.
Preferably, the adding circuit is composed of a resistor R1, a resistor R2, a resistor R3, a feedback resistor Rf, a resistor R, and an operational amplifier, wherein an input terminal of the duty loss compensation module is connected to a positive input terminal of the operational amplifier through the resistor R2, the positive input terminal of the operational amplifier is grounded through the resistor R, a negative input terminal of the operational amplifier is grounded through the resistor R1, and the divided voltage U is divided 2 And is connected to the positive input end of the operational amplifier after passing through the resistor R3.
As can be seen from the above description, in this scheme, the switching tube operates in the ZVS switching state, which further reduces loss compared with a conventional digital power amplifier, and for the problem of duty cycle loss introduced by the H-bridge resonant network, the compensation module is used to suppress predistortion of the input signal.
Drawings
FIG. 1 is a simplified diagram of the overall circuit in accordance with the present invention.
FIG. 2 is a simplified diagram of an H-bridge circuit according to the present invention.
FIG. 3 is a timing diagram of the amplitude pulse voltage generated by the H-bridge under the action of the PWM signal.
FIG. 4 is a simplified diagram of a secondary side full-wave rectification filter circuit of the transformer.
Fig. 5 is the measured duty cycle loss in the H-bridge ZVS topology.
Fig. 6 is a duty cycle loss compensation module.
Fig. 7 shows the test output results of the prototype of the patent.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings:
fig. 1 is a simplified diagram of an overall circuit in an embodiment of the present invention, and the ZVS switched digital power amplifier based on the H-bridge topology according to the present invention includes a dc voltage-stabilized power supply, an H-bridge, an isolation transformer, a rectifying and filtering module, a duty loss compensation module, a control circuit module, and an auxiliary power supply.
FIG. 2 is an H-shaped bridge, wherein Q1, Q2, Q3 and Q4 are 4 power field effect transistors which are connected in sequence according to a diagram, Q1 and Q2 form a left bridge arm of the bridge, Q3 and Q4 form a right bridge arm of the bridge, two switching tubes Q1 and Q3 are a first group of diagonal bridge arm switching tubes, two switching tubes Q2 and Q4 are a second group of diagonal bridge arm switching tubes, under the action of a circuit control module and a switching tube driving signal, the two switching tubes on the left bridge arm and the two switching tubes on the right bridge arm are in a fixed switching period T and are in staggered complementary conduction, the conduction time of each switching tube is 0.5T, the two switching tubes on the right bridge arm are in the fixed switching period T and are in staggered complementary conduction, and the conduction time of each switching tube is 0.5T; the output positive pole of the direct current stabilized power supply is connected to the drain electrodes of the switching tubes Q1 and Q4 on the left bridge arm and the right bridge arm, the output voltage of the direct current stabilized power supply is V, the output negative pole of the direct current stabilized power supply is connected to the source electrodes of the switching tubes Q2 and Q3 under the left bridge arm and the right bridge arm, and when the two switching tubes of the diagonal bridge arms are simultaneously switched on, the voltage between two points AB on the primary side of the transformer is + V or-V (when the first group of diagonal bridge arms are switched on, the voltage between two points AB on the primary side of the transformer is + V, and when the second group of diagonal bridge arms are switched on, the voltage is-V).
Fig. 3 illustrates the working timing sequence of the H-bridge switching tube, t represents the duration of the high level of the PWM signal of the control circuit, Q1, Q2, Q3, and Q4 in the figure are driving signals of four power fets, and the last row AB represents the primary voltage of the transformer. On the basis of staggered complementary conduction of an upper switching tube and a lower switching tube of a left bridge arm and a right bridge arm, a high-level time length t of a square wave output by a PWM (pulse width modulation) modulator in a circuit control module controls the time length of simultaneous conduction of the two switching tubes of the diagonal bridge arm, when t =0, the time length of simultaneous conduction of the two switching tubes of the diagonal bridge arm is shortest and equal to 0, and when the high-level time length t is equal to half of a switching period, the time length of simultaneous conduction of the two switching tubes of the diagonal bridge arm is longest and equal to half of the switching period; under the coordination of the driving circuit and the control circuit, the voltage provided by the direct-current stabilized power supply is chopped by the H bridge, and positive and negative pulse voltages with high level duration equal to T and amplitude equal to input voltage V are obtained between the primary winding AB of the transformer, and the period of the positive and negative pulse voltages is equal to the switching period T of the switching tube.
The input signal of the controller is a + x (T), the signal modulates the duty ratio of the square wave output by the PWM module to obtain the high level time N (a + x (T)) of the PWM signal, N is a proportionality coefficient, the characteristic of the used PWM module is related to, the frequency of x (T) is required to be far less than the switching frequency, the controller adjusts the opening time of four switching tubes Q1, Q2, Q3 and Q4 according to the high level time of the PWM signal, so that the opening time of two switching tubes of a diagonal bridge arm is equal to the high level time N (a + x (T)) of the square wave output by the PWM, and positive and negative pulse voltage with the period T and the amplitude V is generated on the primary side of the transformer.
Fig. 4 shows a rectifying and filtering circuit, in which positive and negative pulse voltages of the primary side of the transformer are coupled to the secondary side through a transformer with an original secondary side turn ratio of 1/K, and are rectified to obtain a square wave voltage with a period of T/2, an amplitude of KN, and a high level duration of N (a + x (T)), and then are subjected to LC low-pass filtering, and high-frequency components are filtered to obtain an output high-power voltage, the output high-power voltage can be represented as 2KVN (a + x (T))/T, at this time, the output voltage is composed of two parts, a direct current component is 2KVNa/T, an alternating current component is 2KVx (T)/T, an output driving signal is a direct current offset superimposed alternating current component, an input signal a + x (T) is changed, a direct current of the output driving signal can be adjusted by adjusting a value, and an alternating current component of the output driving signal can be adjusted by adjusting x (T).
The duty ratio loss phenomenon is a special phenomenon of the ZVS PWM full-bridge converter, namely the duty ratio of the secondary side of the transformer is not completely equal to that of the primary side but is slightly smaller, and the difference value is recorded as duty ratio loss D loss FIG. 5 shows the experimental result of the duty loss phenomenon, where the duty loss increases linearly with the increase of the output current, and if the load resistance of the power amplifier is constant, the duty loss is proportional to the output voltage, and the reason for the duty loss is that, although the primary side has a positive voltage square wave (or a negative voltage square wave), the primary side is not enough to provide the load current, two diodes of the secondary side rectifying part are simultaneously conducted to form a secondary side freewheeling, and since the two diodes are simultaneously conducted, the secondary side voltage is clamped to zero, the primary side has powerWhen the voltage does not exist in the secondary side, the PWM module outputs square waves and the duty ratio of the secondary side is inconsistent, namely the secondary side loses part of the duty ratio, and the lost duty ratio of the secondary side is as follows:
Figure BDA0003752614300000031
wherein L is r Resonant inductance introduced to assist ZVS, V o Is the output voltage of the power amplifier, f s The switching frequency of the H-bridge switching tube, R the load of the power amplifier, V in The power supply voltage is supplied to a direct current stabilized power supply, the turn ratio of an original secondary side of a transformer is 1/K, and as can be seen from the above formula, the duty ratio loss of the secondary side of the transformer is in direct proportion to the output voltage of a power amplifier, the duty ratio of a square wave obtained after the digital power amplifier requires chopping is in direct proportion to the voltage of an input small signal, if the duty ratio loss is not restrained, the larger the input signal of the power amplifier is, the more serious the duty ratio loss is, namely the amplification factors of the power amplifier to all parts of the input signal are not the same, the duty ratio loss of the part with high input signal voltage is large, and the duty ratio loss of the part with low input signal voltage is small, so that larger distortion can be introduced.
In order to reduce the distortion introduced by the above, the present patent proposes a duty ratio loss compensation module as shown in fig. 6, which pre-distorts the input signal to be amplified, so as to compensate the subsequent duty ratio loss part, and the finally obtained actual duty ratio is proportional to the input signal.
R1, R2, R3, rf, R and operational amplifier constitute an addition circuit, to U 1 、U 2 And performing addition operation, wherein the output voltage Uo of the module is as follows:
U O ＝a(U i +bU i )
wherein:
Figure BDA0003752614300000041
Figure BDA0003752614300000042
after passing through the duty ratio loss compensation module, the input signal is predistorted by U O The expression (U) shows that the output signal of the module is increased based on the original signal by the increment and the input signal U i Proportional ratio, opposite to the lost effect of duty ratio, the value of the potentiometer R5 is adjusted to change the distortion of the input signal, the distorted signal is sent to the PWM module, and finally the duty ratio and the input signal U are generated on the secondary side i The direct proportion of the square wave voltage, the duty ratio loss of the H bridge is counteracted by the predistortion module, and the distortion of the digital power amplifier is reduced.
The magnitude of the pre-distortion of the input signal can be adjusted by adjusting the value of the potentiometer R5, when the R5 is increased, the extra increment is increased after the input control signal passes through the compensation module, and the loss of the larger duty ratio of the H bridge can be compensated; when R5 is reduced, after the input control signal passes through the compensation module, the extra increment is reduced, the loss of the compensated duty ratio is small, and in practice, the value of R5 can be adjusted according to the specific condition of the loss of the circuit duty ratio, so that the predistortion module can just compensate the loss of the duty ratio of the H bridge.
The difference between the invention and the traditional H-bridge digital power amplifying circuit is the added duty ratio loss compensation module. The phase shift control refers to a control method for controlling the duty ratio of the primary side of the transformer by changing the conduction coincidence time (generally called phase shift angle) of two upper switching tubes of the H bridge by a control module. The loss of the duty ratio is an inherent defect of a phase-shifted full-bridge topological structure, and refers to the phenomenon that the duty ratio of voltage on the secondary side of a transformer is smaller than the duty ratio of the primary side generated by a controller due to leakage inductance and resonant inductance of the transformer, the loss amount of the duty ratio on the secondary side of the transformer is in direct proportion to the magnitude of load current, and when the load resistance of a digital power amplifier is fixed, the loss amount of the duty ratio is in direct proportion to the magnitude of output voltage, namely, the signal input into a control module. The principle of the duty ratio loss compensation module is that the proportional relation is utilized, the input control signal is subjected to predistortion, the input control signal is additionally increased by utilizing an analog addition circuit, and the increment is in direct proportion to the input control signal so as to offset the duty ratio loss of the H-bridge topology.
Fig. 7 shows a test output result, a control module of a circuit under test adopts a UCC3895 chip of texas instruments company, a PWM modulation module is built in the chip, a modulation signal is input from 2 pins of the chip, complementary square wave signals are output from pins 17 and 18 of the chip as driving instructions of two switching tubes of a left arm, complementary square wave signals are output from pins 13 and 14 as driving instructions of two switching tubes of a right arm, and the time for simultaneously outputting high levels by the pins 13, 17 and 14 and 18 is modulated by the 2-pin modulation signal, so that the requirements of the invention on the functions of a control part can be met, the modulation signal input from pin 2 in the test is a triangular wave voltage with a frequency of 5Hz, a direct current bias with 2.65V and a peak-to-peak value of 0.8V, the output voltage of a direct current stabilized power supply is 160V, the turn ratio of an original secondary side of a transformer is 1.1, the circuit output is a triangular wave with a direct current bias with a peak value of 95V and a peak-peak value of 28V.

Claims (3)

1. A ZVS (zero voltage switching) switch type digital power amplifier based on an H-bridge topology comprises a direct-current stabilized power supply module, a bridge type chopping module, a transformer isolation module, an output rectification filtering module, a control module, a switch tube driving module and an auxiliary power supply, wherein the control module is used for generating switch tube on-off control instructions through a PWM (pulse width modulation) modulator according to external input signals; the switching tube driving module is used for driving the switching tube of the bridge type chopping module to be switched on and off according to the switching-on and switching-off instructions of the control module, and chopping the voltage provided by the direct-current stabilized power supply into positive and negative pulse voltages with duty ratios modulated by input signals; positive and negative pulse voltages generated by the bridge type chopping module are isolated by a transformer and are sent to the output rectifying and filtering module; an output rectifying and filtering module for rectifying the positive and negative pulse voltage into square wave voltage, which becomes a high-power output signal after high-frequency components are filtered out by LC low-pass filtering,
the duty ratio loss compensation module is used for pre-distorting an externally input signal to be amplified so as to compensate the duty ratio loss problem of the H-bridge circuit, and the output of the duty ratio loss compensation module is connected to the PWM modulator of the control module; the duty cycle loss compensation module packIncluding an addition circuit, to U 1 、U 2 Doing an addition operation, U 1 For external input of signals, U 2 For distorted voltages with the same monotonicity as the external input signal, U 2 The distortion voltage, which has the same monotonicity as the input signal, is superimposed on the external input signal after passing through the addition circuit.
2. The ZVS switched-mode digital power amplifier of claim 1, wherein the input terminal of the duty loss compensation module is divided by a constant resistor R4 and a variable resistor R5 to obtain a divided voltage U 2 The magnitude of the distortion voltage is adjusted by adjusting the variable resistor R5.
3. The ZVS switched digital power amplifier of claim 2, wherein the summing circuit comprises a resistor R1, a resistor R2, a resistor R3, a feedback resistor Rf, a resistor R, and an operational amplifier, wherein the input of the duty loss compensation module is connected to the positive input of the operational amplifier via the resistor R2, the positive input of the operational amplifier is grounded via the resistor R, the negative input of the operational amplifier is grounded via the resistor R1, and the divided voltage U is divided by the resistor R 2 And is connected to the positive input end of the operational amplifier after passing through the resistor R3.
CN202210845656.8A 2022-07-19 2022-07-19 ZVS (zero voltage switching) type digital power amplifier based on H-bridge topology Pending CN115208326A (en)

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CN116539070A (en) * 2023-07-04 2023-08-04 深圳砺驰半导体科技有限公司 Digital decoding method, chip, system, vehicle machine and medium of rotary transformer

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* Cited by examiner, † Cited by third party
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CN116539070A (en) * 2023-07-04 2023-08-04 深圳砺驰半导体科技有限公司 Digital decoding method, chip, system, vehicle machine and medium of rotary transformer
CN116539070B (en) * 2023-07-04 2023-09-15 深圳砺驰半导体科技有限公司 Digital decoding method, chip, system, vehicle machine and medium of rotary transformer

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