CN103872987A - Method and circuit for converting alternating-current sine wave signals into direct-current step wave signals - Google Patents
Method and circuit for converting alternating-current sine wave signals into direct-current step wave signals Download PDFInfo
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Abstract
The invention discloses a method and circuit for converting alternating-current sine wave signals into direct-current step wave signals. The method comprises the steps that (1) the alternating-current sine wave signals are rectified into direct-current head signals; (2) the head wave signals are transmitted into a plurality of voltage adjusting devices with different amplitudes, and are divided into multiple stages of voltage signals; (3) the voltage signals are respectively transmitted into a constant current device, voltage signal waves form flat-topped waves, all flat-topped wave voltage signals are connected in sequence, and the direct-current step wave signals are obtained. The circuit comprises a rectifier bridge circuit, the voltage adjusting devices and a plurality of constant current control devices, the rectifier bridge circuit rectifies the alternating-current sine wave signals into the direct-current head wave signals, the voltage adjusting devices are connected in parallel to form a network, the voltage adjusting set values of the voltage adjusting devices are different, the direct-current head wave signals are divided into the multi-stage signals with different amplitudes, the number of the constant current control devices is equal to that of the voltage adjusting devices, the constant current control devices are correspondingly connected with the voltage adjusting devices respectively, and used for controlling the currents of the voltage adjusting devices to be kept constant, and the output signals of the voltages adjusting devices are made to be the flat-topped waves. All the flat-topped wave signals are connected in sequence, and the direct-current step wave signals are formed.
Description
Technical Field
The invention belongs to the field of electronic circuits, and relates to a method and a circuit for converting an alternating-current sine wave signal into a direct-current step wave signal.
Background
In electronic measurement and automatic control systems, sine waves are important analog signals, and have wide application, and the sine waves are converted into step waves which can be processed as digital signals. The step wave is a signal whose value is not continuously changed along with time, its value has discreteness, and the step wave generated by the step wave signal generator can be used as time sequence control signal and multipole potential reference signal.
In some practical applications, the step wave has a digital characteristic, and thus the step wave is widely applied, for example, a step wave signal source is often required as a transistor base signal source in a transistor characteristic test. In the field of electronic circuit design, the step wave is used as a common analog signal, and the sine wave to the step wave can be generated by an AD (analog-to-digital converter) with a counter and a pulse generator, but the circuit of the method is complex and the AD cost is high. The traditional signal source adopts a pump type step wave generating circuit, the precision is lower, and the pulse signal source is required to have certain load capacity, so that the pulse signal source can only be applied to occasions with low requirements.
Disclosure of Invention
The invention provides a conversion circuit from sine waves to step waves, which can generate high-precision step waves with any steps and adjustable step voltage. The technical scheme is as follows:
a method for converting an alternating-current sine wave signal into a direct-current step wave signal comprises the following steps:
(1) rectifying the alternating-current sine wave signal into a direct-current steamed bun signal;
(2) sending the steamed bread wave signals to a plurality of voltage adjusting devices with different amplitudes, and dividing the steamed bread wave signals into multi-order voltage signals;
(3) respectively sending the voltage signals of each order to a constant current device to enable the voltage signal waveforms of each order to be flat-top waves; all the flat top wave voltage signals are continuous in sequence to obtain a direct current step wave signal.
A circuit for converting an ac sine wave signal to a dc step wave signal, comprising:
-a rectifier bridge circuit for rectifying an ac sine wave signal into a dc steamed bread wave signal;
-a plurality of voltage regulating devices connected in parallel to form a network, each voltage regulating device having a different voltage regulating set value, for dividing the dc steamed bread wave signal into a plurality of steps of different amplitudes;
a plurality of constant current control devices, the number of which is the same as that of the voltage regulating devices, and each of which is connected with each voltage regulating device correspondingly, for controlling the current of each voltage regulating device to be kept constant, so that the output signal of each voltage regulating device is a flat-top wave; all the flat top wave signals are continuous in sequence to become direct current step wave signals.
The voltage regulating device is formed by connecting a diode series pipe group and a load resistor in series, the number of diodes in the diode series pipe group of each voltage regulating device is different, when a direct-current steamed bun wave signal flows through the voltage regulating network, the partial pressure acting on the diode series pipe group is different, the partial pressure acting on the load resistor is also different, and therefore the direct-current steamed bun wave signal is converted into a multi-order signal.
The constant current control device comprises: the device comprises a current sampling unit, a reference voltage unit, an operational amplifier and an adjusting tube; wherein,
the reference voltage source unit is used for generating a constant reference voltage;
the current sampling unit is used for sampling the current of the voltage regulating device and outputting a feedback signal to the adjusting tube in a voltage form;
the operational amplifier is used for receiving the current sampling feedback signal and the reference voltage and outputting a control signal to the adjusting tube;
the adjusting tube is used for adjusting the current of the voltage adjusting device to keep constant, so that the waveform of an output signal of the voltage adjusting device is a flat-top wave.
The adjusting tube is one of a transistor, an MOS tube and an IGBT.
The operational amplifier is preferably an integrated circuit operational amplifier with low offset and high gain.
The invention has the beneficial effects that:
1. the step voltage can be of any order, and each order of voltage is adjustable;
2. the circuit is simple, digital logic control is not needed, and programming is not needed;
3. in signal source devices such as a function generator and the like, the scheme of the invention has unique advantages, can be constructed by utilizing the existing circuit, and improves the utilization efficiency of the circuit.
Drawings
Fig. 1 is a system schematic of sine wave to step wave conversion of the present invention.
Fig. 2 is a schematic diagram of a specific circuit of the present invention.
Fig. 3 is a schematic diagram of the conversion process of sine waves to step waves according to the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the invention. The following detailed description of the preferred embodiments of the invention provides specific details for a thorough understanding of the invention, but will provide a full understanding of the invention to those skilled in the art without having to describe such details.
Fig. 1 is a schematic block diagram of a sine wave to step wave conversion circuit of the present invention. The embodiment comprises a rectifier bridge circuit, a step voltage regulating network, a current sampling unit, a reference voltage unit, an operational amplifier and an adjusting tube.
The rectifier bridge circuit is used for receiving sine waves of alternating current input and rectifying the alternating current input voltage into steamed bread waves of direct current voltage;
the current sampling unit is used for sampling the current of the step voltage regulation network;
the reference voltage generating unit is used for generating a constant voltage;
the non-inverting end of the operational amplifier is used for receiving a reference voltage, and the inverting end of the operational amplifier is used for receiving a feedback voltage of the sampling circuit;
the adjusting tube adjusts the current to be constant according to the feedback voltage of the sampling circuit and the set reference voltage.
Referring to fig. 2: the step voltage adjustable step wave generation circuit diagram of the embodiment of the invention is shown, and an alternating sine wave AC is rectified by a rectifying bridge and becomes a steamed bread wave. When the voltage is zero, the M stepped voltage regulating networks have no current, the current flowing through the sampling resistor Rs is zero, the voltage on the sampling resistor Rs is zero, the voltage fed back to the negative input ends of the M operational amplifiers is zero, the operational amplifiers output forward saturation voltage, and the M MOS tubes M1M2 … Mm are in a complete conduction state. When the voltage rises to a level that will turn on the N1 diodes of the first step voltage regulation network, the first step voltage regulation network turns on and current flows through the sampling resistor Rs. The voltage continues to increase, the current increases, and the current is constant at VREF _1/Rs due to the clamping effect of the operational amplifier. The terminal voltage of the load resistor R1, i.e., the first-step output voltage, is:
V1=R1*VREF_1/Rs
in the formula: VREF is an applied voltage;
VREF _1 is a first-order output voltage;
vt1 is the diode forward conduction voltage drop of the first staircase voltage regulation network;
the input voltage continues to increase, and a smaller current is generated in the second step voltage regulating network, so that the voltage on the sampling resistor Rs is increased and is larger than VREF _ 1. The output of the first path of constant current control operational amplifier is low level, and the MOS tube M1 is cut off. The current flows to the ground through the first step voltage regulating network, the second constant current control network and the RS. The sampling current is VREF _ 2/Rs. The terminal voltage of the load resistor R2, i.e., the second step output voltage, is:
V2=R2*VREF_2/Rs
in the formula: VREF is an applied voltage;
VREF _2 is a second-order output voltage;
vt2 is the diode forward conduction voltage drop of the second staircase voltage regulation network;
by analogy, the N stepped voltage regulating networks can generate stepped waves of N-step voltage, and the stepped waves with different amplitudes can be obtained by setting the amplitude and the frequency of the input sine waves, the number of diodes in each stepped voltage regulating network and the load resistance.
The above transformation process is shown in FIG. 3.
While the step wave generating circuit provided by the present invention has been described in detail, for those skilled in the art, according to the idea of the embodiment of the present invention, the specific implementation manner and the application scope may be changed, and in summary, the present invention should not be construed as limiting the present invention.
Claims (6)
1. A method for converting an alternating-current sine wave signal into a direct-current step wave signal comprises the following steps:
(1) rectifying the alternating-current sine wave signal into a direct-current steamed bun signal;
(2) sending the steamed bread wave signals to a plurality of voltage adjusting devices with different amplitudes, and dividing the steamed bread wave signals into multi-order voltage signals;
(3) respectively sending the voltage signals of each order to a constant current device to enable the voltage signal waveforms of each order to be flat-top waves; all the flat top wave voltage signals are continuous in sequence to obtain a direct current step wave signal.
2. A circuit for converting an ac sine wave signal to a dc step wave signal, comprising:
-a rectifier bridge circuit for rectifying an ac sine wave signal into a dc steamed bread wave signal;
-a plurality of voltage regulating devices connected in parallel to form a network, each voltage regulating device having a different voltage regulating set value, for dividing the dc steamed bread wave signal into a plurality of steps of different amplitudes;
a plurality of constant current control devices, the number of which is the same as that of the voltage regulating devices, and each of which is connected with each voltage regulating device correspondingly, for controlling the current of each voltage regulating device to be kept constant, so that the output signal of each voltage regulating device is a flat-top wave; all the flat top wave signals are continuous in sequence to become direct current step wave signals.
3. The circuit for converting an ac sine wave signal to a dc step wave signal of claim 2, wherein: the voltage regulating device is formed by connecting a diode series pipe group and a load resistor in series, the number of diodes in the diode series pipe group of each voltage regulating device is different, when a direct-current steamed bun wave signal flows through the voltage regulating network, the partial pressure acting on the diode series pipe group is different, the partial pressure acting on the load resistor is also different, and therefore the direct-current steamed bun wave signal is converted into a multi-order signal.
4. The circuit for converting an ac sine wave signal to a dc step wave signal of claim 2, wherein: the constant current control device comprises: the device comprises a current sampling unit, a reference voltage unit, an operational amplifier and an adjusting tube;
the reference voltage source unit is used for generating a constant reference voltage;
the current sampling unit is used for sampling the current of the voltage regulating device and outputting a feedback signal to the adjusting tube in a voltage form;
the operational amplifier is used for receiving the current sampling feedback signal and the reference voltage and outputting a control signal to the adjusting tube;
the adjusting tube is used for adjusting the current of the voltage adjusting device to keep constant, so that the waveform of an output signal of the voltage adjusting device is a flat-top wave.
5. The circuit for converting an ac sine wave signal to a dc step wave signal of claim 4, wherein: the adjusting tube is one of a transistor, an MOS tube and an IGBT.
6. The circuit for converting an ac sine wave signal to a dc step wave signal of claim 4, wherein: the operational amplifier adopts an integrated circuit operational amplifier with low offset and high gain.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134085.2A CN103872987A (en) | 2014-04-03 | 2014-04-03 | Method and circuit for converting alternating-current sine wave signals into direct-current step wave signals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410134085.2A CN103872987A (en) | 2014-04-03 | 2014-04-03 | Method and circuit for converting alternating-current sine wave signals into direct-current step wave signals |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110058100A (en) * | 2019-05-08 | 2019-07-26 | 南京南瑞继保电气有限公司 | A kind of the Time delay measurement method, apparatus and system of DC transmission system |
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| US5162744A (en) * | 1991-10-18 | 1992-11-10 | National Semiconductor Corporation | Method of determining settling time of a device under test |
| CN1085699A (en) * | 1992-10-16 | 1994-04-20 | 凌阳科技股份有限公司 | Analog type step wave generator |
| CN103731124A (en) * | 2014-01-24 | 2014-04-16 | 电子科技大学 | Step wave generating circuit |
-
2014
- 2014-04-03 CN CN201410134085.2A patent/CN103872987A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5162744A (en) * | 1991-10-18 | 1992-11-10 | National Semiconductor Corporation | Method of determining settling time of a device under test |
| CN1085699A (en) * | 1992-10-16 | 1994-04-20 | 凌阳科技股份有限公司 | Analog type step wave generator |
| CN103731124A (en) * | 2014-01-24 | 2014-04-16 | 电子科技大学 | Step wave generating circuit |
Non-Patent Citations (1)
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| 徐淑英: ""基于EWB的阶梯波发生器的电路设计"", 《武汉船舶职业技术学院学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110058100A (en) * | 2019-05-08 | 2019-07-26 | 南京南瑞继保电气有限公司 | A kind of the Time delay measurement method, apparatus and system of DC transmission system |
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