CN114157165B - High-frequency full-bridge chopper circuit and transformer coupling isolation amplifier - Google Patents
High-frequency full-bridge chopper circuit and transformer coupling isolation amplifier Download PDFInfo
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- CN114157165B CN114157165B CN202111519136.XA CN202111519136A CN114157165B CN 114157165 B CN114157165 B CN 114157165B CN 202111519136 A CN202111519136 A CN 202111519136A CN 114157165 B CN114157165 B CN 114157165B
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
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Abstract
The invention discloses a high-frequency full-bridge chopper circuit and a transformer coupling isolation amplifier, wherein the full-bridge chopper circuit comprises a modulation circuit and a demodulation circuit; the modulation circuit is used for chopping the amplified input signal, obtaining a Pulse Amplitude Modulation (PAM) signal taking the input signal as an envelope and taking a chopping synchronizing signal as a period after chopping, and inputting the Pulse Amplitude Modulation (PAM) signal into the first transformer for coupling output; and the demodulation circuit is used for synchronously demodulating the PAM signal coupled and output by the first transformer, demodulating the PAM signal to obtain an envelope signal of the PAM signal, and outputting the envelope signal through subsequent filtering and amplifying. A transformer coupling isolation amplifier comprises a full-bridge chopper circuit, a signal input circuit, a transformer, a signal output circuit and a power supply circuit. The invention has simple and reasonable structure, is a high-frequency signal conditioning technology of a chopper type field-effect transistor, and has the chopping frequency which is 2 times of that of the traditional chopper circuit under the demodulation time sequence signals with the same frequency.
Description
Technical Field
The invention relates to the technical field of full-bridge chopper circuits and isolation amplifiers, in particular to a high-frequency full-bridge chopper circuit and transformer coupling isolation amplifier.
Background
The J-FET junction field effect transistor is a switching element of a sensor chopper modulation and demodulation switch circuit, a circuit is shown in figure 1, Q1 and Q2 are J-FET junction field effect transistors, a signal is subjected to chopper modulation by a chopper modulator consisting of a primary transformer T1 and a chopper tube Q2, and is coupled into a secondary transformer, and a chopper phase discriminator consisting of the secondary transformer T1 and the chopper tube Q1 is subjected to phase demodulation.
At present, the devices mainly depend on import, and in the process of searching J-FET junction field effect transistors with performance indexes capable of being replaced with those of the imported devices, the fact that the domestic replaceable manufacturers produce few separated JFETs is found, so that the domestic electric quantity sensor is difficult to produce and work; and the chopping frequency of the existing full-bridge chopper circuit is low.
Therefore, in order to solve the problems, the invention develops the research on the alternative scheme of the J-FET junction field effect transistor on the basis of the prior localization and the prior art, and the design of the high-frequency signal conditioning technology of the chopper-type field effect transistor is urgent.
Disclosure of Invention
The invention aims to provide a high-frequency full-bridge chopper circuit and a transformer coupling isolation amplifier, which are used for designing a high-frequency signal conditioning technology of a chopper type field-effect transistor-free device and realizing the full-bridge chopper circuit with high chopping frequency; and the full-bridge chopper circuit plays a role in modulation and demodulation in the circuit of the isolation amplifier.
The invention is realized by the following technical scheme:
In a first aspect, the present invention provides a high-frequency full-bridge chopper circuit, where the full-bridge chopper circuit includes a modulation circuit and a demodulation circuit;
the modulation circuit is used for chopping the amplified input signal, obtaining a Pulse Amplitude Modulation (PAM) signal taking the input signal as an envelope and taking a chopping synchronizing signal as a period after chopping, and inputting the Pulse Amplitude Modulation (PAM) signal into the first transformer for coupling output;
And the demodulation circuit is used for synchronously demodulating the PAM signal coupled and output by the first transformer, demodulating the PAM signal to obtain an envelope signal of the PAM signal, and outputting the envelope signal through subsequent filtering and amplifying.
The working principle is as follows: based on the fact that the existing bridge type chopper circuit mainly adopts J-FET junction field effect transistors, the devices mainly depend on import, and in the process of searching J-FET junction field effect transistors with performance indexes capable of being mutually replaced with imported devices, it is found that the number of JFETs produced and separated by domestic replaceable factories is very small, so that the domestic electric quantity sensor is difficult to produce and work; meanwhile, the existing full bridge has the problems of low chopping frequency of a chopper circuit and the like. The invention designs a high-frequency full-bridge chopper circuit, which is mainly composed of two single-pole double-throw switch ICs, as shown in figures 2 and 3, wherein the primary/secondary of a transformer and the single-pole double-throw circuit N1/N2 respectively form a full-bridge pulse amplitude modulation/demodulation circuit. The input signal is controlled by a time sequence signal IN11, and pulse amplitude modulation of the signal is completed by a modulation circuit; the chopped and modulated signals are coupled through a transformer T1, and the demodulation circuit completes demodulation of the modulated signals under the control of a time sequence signal IN1 and restores the modulated signals to direct current signals. Demodulation timing IN11 and modulation timing IN1 are IN phase with each other. Under the demodulation time sequence signal with the same frequency, the single-pole double-throw switch is utilized to chop twice in one period, so that the chopping frequency of the high-frequency full-bridge chopper circuit is 2 times that of the traditional J-FET-based chopper circuit. The characteristic is that the purpose of eliminating the influence of the input capacitance of the N1 and N2 circuits is achieved by reducing the frequency of the time sequence signal on the premise of ensuring the original chopping frequency.
Further, the modulation circuit comprises a chopper modulator and a first single-pole double-throw switch, one end of the chopper modulator is connected with the signal input circuit, and the other end of the chopper modulator is correspondingly connected with the pin 1 end and the pin 3 end of the primary winding of the first transformer through two ends of the first single-pole double-throw switch;
The input signal of the signal input circuit is controlled by a time sequence signal IN11, and pulse amplitude modulation of the signal is completed by the modulation circuit; the chopper-modulated signal is coupled via a first transformer T1.
Further, the demodulation circuit comprises a chopper demodulator and a second single-pole double-throw switch, wherein one end of the chopper demodulator is correspondingly connected with the pin 4 end and the pin 6 end of the secondary winding of the first transformer through two ends of the second single-pole double-throw switch, and the other end of the chopper demodulator is connected to the signal output circuit;
the demodulation circuit completes demodulation of the modulation signal under the control of the time sequence signal IN1 and restores the modulation signal to a direct current signal.
Further, the pin 2 of the primary winding of the first transformer is connected to the input of the power circuit, and the pin 5 of the primary winding of the first transformer is connected to the output of the power circuit.
Further, the first single-pole double-throw switch and the second single-pole double-throw switch are single-pole double-throw switches SGM3711YTQA G/TR with negative charge pump or other single-pole double-throw switches capable of passing positive and negative voltage signals.
Further, the modulation sequence IN11 and the demodulation sequence IN1 are IN phase with the same frequency.
In a second aspect, the present invention further provides a transformer coupled isolation amplifier, including the high-frequency full-bridge chopper circuit; also comprises a signal input circuit, a transformer, a signal output circuit and a power supply circuit,
The signal input circuit is used for inputting an input signal, amplifying the input signal and outputting the amplified input signal to the modulation circuit;
The first transformer is used for coupling the Pulse Amplitude Modulation (PAM) signal modulated by the modulation circuit and outputting the signal to the demodulation circuit;
The signal output circuit is used for carrying out low-pass filtering on the envelope signal of the PAM obtained by the output of the demodulation circuit, filtering out a high-frequency signal and amplifying and outputting the high-frequency signal;
the power supply circuit is used for providing an isolated power supply and adjusting/demodulating time sequence signals.
The invention relates to a transformer coupling isolation amplifier, which comprises a high-frequency full-bridge chopper circuit, wherein the high-frequency full-bridge chopper circuit plays a role in modulation and demodulation in a circuit of the isolation amplifier; the signal input circuit is responsible for voltage input signal acquisition, filtering, EMC protection and safety protection; the modulation and demodulation circuit is responsible for completing amplitude chopping modulation and demodulation of an input signal; the power circuit is responsible for providing an isolated power supply and adjusting/demodulating the time sequence signal; the signal output circuit is responsible for finishing filtering and buffering output, signal amplification, EMC protection and safety protection of the demodulated signals.
Further, the signal input circuit comprises a first amplifier, two input ends of the first amplifier are correspondingly connected with forward input and reverse input, an output end of the first amplifier is connected with the modulation circuit, the first amplifier is also connected with an input isolation power supply, and the input isolation power supply is connected with a primary winding side of a second transformer T2; the input isolation power supply is also connected with the modulation circuit, and the modulation circuit is connected with the primary winding side of the second transformer T2.
Further, the signal output circuit comprises a second amplifier, wherein the positive input end of the second amplifier is connected with the demodulation circuit, and the negative input end of the second amplifier is connected with the output end of the second amplifier; the second amplifier is also connected with a power supply oscillator, the power supply oscillator is connected with the secondary winding side of the second transformer T2, and the power supply oscillator is connected with a demodulation circuit.
Further, the power supply circuit adopts a DC-DC converter.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. The invention relates to a high-frequency full-bridge chopper circuit, which mainly comprises two single-pole double-throw switch ICs, wherein an input signal is controlled by a time sequence signal IN11 to finish pulse amplitude modulation of the signal IN a modulation circuit; the chopped and modulated signals are coupled through a transformer T1, and the demodulation circuit completes demodulation of the modulated signals under the control of a time sequence signal IN1 and restores the modulated signals to direct current signals. Demodulation timing IN11 and modulation timing IN1 are IN phase with each other. Under the demodulation time sequence signal with the same frequency, the single-pole double-throw switch is utilized to chop twice in one period, so that the chopping frequency of the high-frequency full-bridge chopper circuit is 2 times that of the traditional J-FET-based chopper circuit.
2. The transformer coupling isolation amplifier has a simple and reasonable structure, and the invention designs a high-frequency signal conditioning technology of a chopper type field-effect transistor-free chopper circuit to realize a full-bridge chopper circuit with high chopping frequency; and the full-bridge chopper circuit plays a role in modulation and demodulation in the circuit of the isolation amplifier.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a circuit diagram of a conventional implementation of a modem using a J-FET junction field effect transistor.
Fig. 2 is a schematic diagram of a modem circuit of a high-frequency full-bridge chopper circuit according to the present invention.
FIG. 3 is a diagram of a high frequency full bridge chopper circuit according to the present invention.
Fig. 4 is a circuit diagram of a transformer coupled isolation amplifier according to the present invention.
Detailed Description
Hereinafter, the terms "comprises" or "comprising" as may be used in various embodiments of the present invention indicate the presence of inventive functions, operations or elements, and are not limiting of the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the invention, the terms "comprises," "comprising," and their cognate terms are intended to refer to a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be interpreted as first excluding the existence of or increasing likelihood of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B or may include both a and B.
Expressions (such as "first", "second", etc.) used in the various embodiments of the invention may modify various constituent elements in the various embodiments, but the respective constituent elements may not be limited. For example, the above description does not limit the order and/or importance of the elements. The above description is only intended to distinguish one element from another element. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described to "connect" one component element to another component element, a first component element may be directly connected to a second component element, and a third component element may be "connected" between the first and second component elements. Conversely, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the invention belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in connection with the various embodiments of the invention.
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 2 and 3, the high-frequency full-bridge chopper circuit of the invention comprises a modulation circuit and a demodulation circuit;
the modulation circuit is used for chopping the amplified input signal, obtaining a Pulse Amplitude Modulation (PAM) signal taking the input signal as an envelope and taking a chopping synchronizing signal as a period after chopping, and inputting the Pulse Amplitude Modulation (PAM) signal into the first transformer for coupling output;
And the demodulation circuit is used for synchronously demodulating the PAM signal coupled and output by the first transformer, demodulating the PAM signal to obtain an envelope signal of the PAM signal, and outputting the envelope signal through subsequent filtering and amplifying.
In this embodiment, the modulation circuit includes a chopper modulator and a first single-pole double-throw switch, where one end of the chopper modulator is connected to the signal input circuit, and the other end of the chopper modulator is correspondingly connected to the pin 1 end and the pin 3 end of the primary winding of the first transformer through two ends of the first single-pole double-throw switch;
The input signal of the signal input circuit is controlled by a time sequence signal IN11, and pulse amplitude modulation of the signal is completed by the modulation circuit; the chopper-modulated signal is coupled via a first transformer T1.
In this embodiment, the demodulation circuit includes a chopper demodulator and a second single-pole double-throw switch, where one end of the chopper demodulator is correspondingly connected to the pin 4 end and the pin 6 end of the secondary winding of the first transformer through two ends of the second single-pole double-throw switch, and the other end of the chopper demodulator is connected to the signal output circuit;
the demodulation circuit completes demodulation of the modulation signal under the control of the time sequence signal IN1 and restores the modulation signal to a direct current signal.
In this embodiment, the pin 2 of the primary winding of the first transformer is connected to the input of the power circuit, and the pin 5 of the primary winding of the first transformer is connected to the output of the power circuit.
In this embodiment, the first single-pole double-throw switch and the second single-pole double-throw switch are single-pole double-throw switches SGM3711YTQA G/TR with negative charge pump or other single-pole double-throw switches that can pass through positive and negative voltage signals.
IN this embodiment, the modulation sequence IN11 and the demodulation sequence IN1 are IN phase with each other.
The working principle is as follows: based on the fact that the existing bridge type chopper circuit mainly adopts J-FET junction field effect transistors, the devices mainly depend on import, and in the process of searching J-FET junction field effect transistors with performance indexes capable of being mutually replaced with imported devices, it is found that the number of JFETs produced and separated by domestic replaceable factories is very small, so that the domestic electric quantity sensor is difficult to produce and work; meanwhile, the existing full bridge has the problems of low chopping frequency of a chopper circuit and the like. The invention designs a high-frequency full-bridge chopper circuit, which is mainly composed of two single-pole double-throw switch ICs, as shown in figures 2 and 3, wherein the primary/secondary of a transformer and the single-pole double-throw circuit N1/N2 respectively form a full-bridge pulse amplitude modulation/demodulation circuit. The input signal is controlled by a time sequence signal IN11, and pulse amplitude modulation of the signal is completed by a modulation circuit; the chopped and modulated signals are coupled through a transformer T1, and the demodulation circuit completes demodulation of the modulated signals under the control of a time sequence signal IN1 and restores the modulated signals to direct current signals. Demodulation timing IN11 and modulation timing IN1 are IN phase with each other. Under the demodulation time sequence signal with the same frequency, the single-pole double-throw switch is utilized to chop twice in one period, so that the chopping frequency of the high-frequency full-bridge chopper circuit is 2 times that of the traditional J-FET-based chopper circuit. The characteristic is that the purpose of eliminating the influence of the input capacitance of the N1 and N2 circuits is achieved by reducing the frequency of the time sequence signal on the premise of ensuring the original chopping frequency.
Example 2
As shown in fig. 4, the difference between the present embodiment and embodiment 1 is that the present embodiment provides a transformer coupling isolation amplifier, which includes the high-frequency full-bridge chopper circuit; the power supply circuit is characterized by also comprising a signal input circuit, a transformer, a signal output circuit and a power supply circuit; a high-frequency full-bridge chopper circuit plays a role in modulation and demodulation in a circuit of an isolation amplifier; the signal input circuit is responsible for voltage input signal acquisition, filtering, EMC protection and safety protection; the modulation and demodulation circuit is responsible for completing amplitude chopping modulation and demodulation of an input signal; the power circuit is responsible for providing an isolated power supply and adjusting/demodulating the time sequence signal; the signal output circuit is responsible for finishing filtering and buffering output, signal amplification, EMC protection and safety protection of the demodulated signals.
Specifically:
The signal input circuit is used for inputting an input signal, amplifying the input signal and outputting the amplified input signal to the modulation circuit;
The modulation circuit is used for chopping the amplified input signal, and obtaining a Pulse Amplitude Modulation (PAM) signal taking the input signal as an envelope and taking a chopping synchronizing signal as a period after chopping;
The first transformer is used for coupling the Pulse Amplitude Modulation (PAM) signal modulated by the modulation circuit and outputting the signal to the demodulation circuit;
And the demodulation circuit is used for synchronously demodulating the PAM signal coupled and output by the first transformer to obtain an envelope signal of the PAM.
The signal output circuit is used for carrying out low-pass filtering on the envelope signal of the PAM obtained by the output of the demodulation circuit, filtering out a high-frequency signal and amplifying and outputting the high-frequency signal;
the power supply circuit is used for providing an isolated power supply and adjusting/demodulating time sequence signals.
In this embodiment, the signal input circuit includes a first amplifier, two input ends of the first amplifier are correspondingly connected to a forward input and a reverse input, an output end of the first amplifier is connected to the modulation circuit, the first amplifier is further connected to an input isolation power supply, and the input isolation power supply is connected to a primary winding side of the second transformer T2; the input isolation power supply is also connected with the modulation circuit, and the modulation circuit is connected with the primary winding side of the second transformer T2.
In this embodiment, the signal output circuit includes a second amplifier, a positive input end of the second amplifier is connected to the demodulation circuit, and a negative input end of the second amplifier is connected to an output end of the second amplifier; the second amplifier is also connected with a power supply oscillator, the power supply oscillator is connected with the secondary winding side of the second transformer T2, and the power supply oscillator is connected with a demodulation circuit.
In this embodiment, the power supply is actually a DC-DC converter. The power supply unit channel consists of a square wave oscillation unit, a power amplification unit, an isolation transformer and a rectifying and filtering unit circuit. It provides a chopping/demodulation synchronization signal in addition to the isolated dc power supply required for the input and output signals.
As shown in fig. 4, the working process is: the input signal enters a chopper modulation circuit after being amplified by a first amplifier input with low temperature drift, and the chopper modulation circuit generally consists of a controlled switching device; under the control of a chopping synchronizing signal provided by a power supply channel of a power supply, the chopping modulation switching device chops an input signal to obtain a Pulse Amplitude Modulation (PAM) signal taking the input signal as an envelope and taking the chopping synchronizing signal as a period. The PAM signal enters a chopper demodulation circuit after being coupled by a transformer T 1. The structure and principle of the chopper demodulation circuit are similar to those of the modulation circuit. Under the control of demodulation synchronous signals provided by a power supply channel of a power supply, the chopper demodulation circuit synchronously demodulates the PAM signals. And filtering high-frequency signals from the envelope signals of the PAM obtained by demodulation through low-pass filtering, and then amplifying and outputting the signals in a second amplifier. Wherein the transformer T1 is electrically isolated from the electronic signal processing circuit as a circuit connected to the input signal source, the modulation and demodulation circuit comprises two single pole double throw switches IC, which function to modulate the direct current or low frequency signal of the first amplifier a at a higher frequency, which couples it from the primary winding to the secondary winding of the transformer T 1.
The two single-pole double-throw switch ICs construct a full-bridge chopper circuit with the following detailed design:
the input signal is controlled by a time sequence signal IN11, and pulse amplitude modulation of the signal is completed by a modulation circuit; the chopped and modulated signals are coupled through a transformer T1, and the demodulation circuit completes demodulation of the modulated signals under the control of a time sequence signal IN1 and restores the modulated signals to direct current signals. Demodulation timing IN11 and modulation timing IN1 are IN phase with each other.
The full-bridge modem circuit designed by adopting the nationwide device is shown in fig. 3:
N1 is a modulation circuit, N2 is a demodulation circuit, and the modulation circuit and the demodulation circuit are single-pole double-throw switches SGM3711YTQA G/TR with negative charge pumps or other single-pole double-throw switches capable of passing positive and negative voltage signals.
The invention has simple and reasonable structure, and designs a high-frequency signal conditioning technology of the chopper-type field-effect-tube-free chopper circuit to realize a full-bridge chopper circuit with high chopping frequency; the full-bridge chopper circuit plays a role in modulation and demodulation in a circuit of the isolation amplifier, and under the demodulation time sequence signal with the same frequency, the chopping frequency of the high-frequency full-bridge chopper circuit is 2 times that of the traditional J-FET-based chopper circuit. The characteristic is that the purpose of eliminating the influence of the input capacitance of the N1 and N2 circuits is achieved by reducing the frequency of the time sequence signal on the premise of ensuring the original chopping frequency.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The high-frequency full-bridge chopper circuit is characterized by comprising a modulation circuit and a demodulation circuit;
the modulation circuit is used for chopping the amplified input signal, obtaining a Pulse Amplitude Modulation (PAM) signal taking the input signal as an envelope and taking a chopping synchronizing signal as a period after chopping, and inputting the Pulse Amplitude Modulation (PAM) signal into the first transformer for coupling output;
the demodulation circuit is used for synchronously demodulating the Pulse Amplitude Modulation (PAM) signal coupled and output by the first transformer, demodulating the Pulse Amplitude Modulation (PAM) signal to obtain an envelope signal of the Pulse Amplitude Modulation (PAM) signal, and outputting the envelope signal through subsequent filtering and amplifying;
The modulation circuit comprises a chopper modulator and a first single-pole double-throw switch, wherein one end of the chopper modulator is connected with the signal input circuit, and the other end of the chopper modulator is correspondingly connected with the pin 1 end and the pin 3 end of the primary winding of the first transformer through the two ends of the first single-pole double-throw switch;
The input signal of the signal input circuit is controlled by a time sequence signal IN11, and pulse amplitude modulation of the signal is completed by the modulation circuit; the chopped and modulated signals are coupled through a first transformer;
The demodulation circuit comprises a chopper demodulator and a second single-pole double-throw switch, wherein one end of the chopper demodulator is correspondingly connected with the pin 4 end and the pin 6 end of the secondary winding of the first transformer through two ends of the second single-pole double-throw switch, and the other end of the chopper demodulator is connected to the signal output circuit;
the demodulation circuit completes demodulation of the modulation signal under the control of the time sequence signal IN1 and restores the modulation signal to a direct current signal.
2. The high frequency full bridge chopper circuit of claim 1 wherein pin 2 of the primary winding of the first transformer is connected to an input of a power circuit and pin 5 of the primary winding of the first transformer is connected to an output of the power circuit.
3. The high-frequency full-bridge chopper circuit of claim 1, wherein the first single-pole double-throw switch and the second single-pole double-throw switch are single-pole double-throw switches SGM3711YTQA G/TR with negative charge pump.
4. The high-frequency full-bridge chopper circuit according to claim 1, wherein the modulation timing IN11 and the demodulation timing IN1 are IN phase with each other.
5. A transformer coupled isolation amplifier comprising a high frequency full bridge chopper circuit according to any one of claims 1 to 4; also comprises a signal input circuit, a transformer, a signal output circuit and a power supply circuit,
The signal input circuit is used for inputting an input signal, amplifying the input signal and outputting the amplified input signal to the modulation circuit;
The first transformer is used for coupling the Pulse Amplitude Modulation (PAM) signal modulated by the modulation circuit and outputting the signal to the demodulation circuit;
The signal output circuit is used for carrying out low-pass filtering on the envelope signal of the Pulse Amplitude Modulation (PAM) signal obtained by the output of the demodulation circuit, filtering out a high-frequency signal and amplifying the high-frequency signal;
the power supply circuit is used for providing an isolated power supply and adjusting/demodulating time sequence signals.
6. The transformer coupled isolation amplifier of claim 5, wherein the signal input circuit comprises a first amplifier, two input terminals of the first amplifier are correspondingly connected to a forward input and a reverse input, an output terminal of the first amplifier is connected to the modulation circuit, the first amplifier is further connected to an input isolation power supply, and the input isolation power supply is connected to a primary winding side of a second transformer; the input isolation power supply is also connected with the modulation circuit, and the modulation circuit is connected with the primary winding side of the second transformer.
7. The transformer coupled isolation amplifier of claim 5, wherein the signal output circuit comprises a second amplifier, a positive input of the second amplifier being connected to the demodulation circuit, a negative input of the second amplifier being connected to an output of the second amplifier; the second amplifier is also connected with a power supply oscillator, the power supply oscillator is connected with the secondary winding side of the second transformer, and the power supply oscillator is connected with a demodulation circuit.
8. The transformer coupled isolation amplifier of claim 5, wherein the power circuit employs a DC-DC converter.
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Citations (2)
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| CN101394163A (en) * | 2008-10-09 | 2009-03-25 | 捷顶微电子（上海）有限公司 | Signal conditioning circuit and dual sampling-hold circuit applying the conditioning method |
| CN106253771A (en) * | 2016-08-26 | 2016-12-21 | 绵阳市维博电子有限责任公司 | A kind of energy release system driven for double-winding motor Hot Spare |
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| GB2463880A (en) * | 2008-09-25 | 2010-03-31 | Ubidyne Inc | An EER amplifier with linearising RF feedback |
| US9685933B2 (en) * | 2014-08-25 | 2017-06-20 | Linear Technology Corporation | Notch filter for ripple reduction |
| US9768705B1 (en) * | 2016-10-07 | 2017-09-19 | TSi Power Corp. | Multibridge power converter for AC mains |
| CN107241069A (en) * | 2017-06-06 | 2017-10-10 | 绵阳市维博电子有限责任公司 | A kind of transformer coupled isolated amplifier of connection in series-parallel chopper-type |
| CN109921662B (en) * | 2019-03-25 | 2020-10-16 | 哈工大（张家口）工业技术研究院 | Control Method of High Frequency Isolated Variable Topology AC-DC Converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101394163A (en) * | 2008-10-09 | 2009-03-25 | 捷顶微电子（上海）有限公司 | Signal conditioning circuit and dual sampling-hold circuit applying the conditioning method |
| CN106253771A (en) * | 2016-08-26 | 2016-12-21 | 绵阳市维博电子有限责任公司 | A kind of energy release system driven for double-winding motor Hot Spare |
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