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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- CN103872987A CN103872987A CN201410134085.2A CN201410134085A CN103872987A CN 103872987 A CN103872987 A CN 103872987A CN 201410134085 A CN201410134085 A CN 201410134085A CN 103872987 A CN103872987 A CN 103872987A
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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 electronic circuit field, relate to a kind of method and circuit that AC sine wave signal is converted into direct current step signal.
Background technology
In electronic measurements and automatic control system, sine wave is very important a kind of analog signal, has a wide range of applications, and sine wave is changed into staircase waveform and can treat as Digital Signal Processing.Staircase waveform is not continually varying signal in time of a kind of value, and its value has discreteness, and the staircase waveform being produced by step signal generator can be used as timing control signal and multipole current potential reference signal.
In some practical applications, because having numerical characteristic, staircase waveform is widely applied, and for example in transistor characteristic test, often need step signal source as transistor base signal source.In electronic circuit design field, staircase waveform is as a kind of conventional analog signal, sinusoidal wave can be by AD(AD converter to staircase waveform) counter of joining, pulse generator generation, still this method circuit more complicated, AD cost is higher.Traditional signal source adopts pump formula ladder wave generation circuit, and precision is lower, and requires pulse signal source to have certain load capacity, so can only be applicable to less demanding occasion.
Summary of the invention
The invention provides a kind ofly sinusoidal wave to staircase waveform conversion circuit, can produce arbitrary order, high accuracy staircase waveform that stepped-up voltage is adjustable.Its technical scheme is:
A method that AC sine wave signal is converted into direct current step signal, comprises step:
(1), by AC sine wave signal rectification be direct current steamed bun signal;
(2), steamed bun ripple signal is sent into the voltage regulating device that multiple amplitudes are different, be divided into multistage voltage signal;
(3), each rank voltage signal is sent into respectively to constant-current device, make each rank waveform voltage signal become flat-topped wave; All flat-topped wave voltage signal orders continuously, obtain direct current step signal.
A circuit that AC sine wave signal is converted into direct current step signal, comprising:
-rectifier circuit, becomes direct current steamed bun ripple signal by AC sine wave signal rectification;
-multiple voltage regulating devices, and be unified into network, the voltage-regulation set point difference of each voltage regulating device, becomes by direct current steamed bun ripple division of signal the multistage signal that amplitude is different;
-multiple constant-current control devices, its quantity is identical with voltage regulating device, is connected respectively each voltage regulating device, keeps constant for controlling the electric current of each voltage regulating device, and the output signal that makes voltage regulating device is flat-topped wave; All flat-topped wave signal sequences are continuous, become direct current step signal.
Described voltage regulating device is in series by a diode tandem tube group and a load resistance, number of diodes difference in the diode tandem tube group of each voltage regulating device, in the time that direct current steamed bun ripple signal is flowed through voltage-regulation network, act on the dividing potential drop difference of diode tandem tube group, act on the also difference of dividing potential drop on load resistance, thereby direct current steamed bun ripple signal is changed into multistage signal.
Described constant-current control device comprises: current sampling unit, reference voltage unit, operational amplifier and adjustment pipe; Wherein,
Described reference voltage source unit is for generation of constant reference voltage;
Described current sampling unit is for the electric current of sampled voltage adjusting device, and with voltage form to adjusting pipe output feedback signal;
Described operational amplifier is for received current sampled feedback signal and reference voltage, to adjusting pipe output control signal;
Described adjustment pipe keeps constant for the electric current of regulation voltage adjusting device, and the signal output waveform that makes voltage regulating device is flat-topped wave.
Described adjustment pipe is one of transistor, metal-oxide-semiconductor, IGBT.
Described operational amplifier is the integrated circuit operational amplifier of low imbalance high-gain preferably.
Beneficial effect of the present invention:
1, stepped-up voltage can be arbitrary order, and every rank voltage is all adjustable;
2, circuit is simple, there is no Digital Logic control, does not also need programming;
3, in the signal source devices such as function generator, the present invention program has unique advantage, can utilize existing circuit to build, and improves circuit utilization ratio.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram that sine wave of the present invention transforms to staircase waveform.
Fig. 2 is a kind of physical circuit schematic diagram of the present invention.
Fig. 3 is the sinusoidal wave conversion process schematic diagram to staircase waveform of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiment.The present invention contain any in marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.For making the public that the present invention is had thoroughly and to be understood, below in the preferred embodiment of the present invention detailed explanation concrete details, but do not have for a person skilled in the art the description of these details can understand the present invention completely yet.
Fig. 1 is the theory diagram of a kind of sine wave of the present invention to staircase waveform conversion circuit.In this embodiment, comprise rectifier circuit, stepped-up voltage regulating networks, current sampling unit, reference voltage unit, operational amplifier and adjustment pipe.
Described rectifier circuit exchanges for receiving the sine wave of inputting, and described AC-input voltage is rectified into the steamed bun ripple of direct voltage;
Described current sampling unit is for the electric current of the stepped-up voltage regulating networks of sampling;
Described reference voltage generation unit is for generation of constant voltage;
The in-phase end of described operational amplifier is used for receiving reference voltage, and end of oppisite phase is for receiving the feedback voltage of sample circuit;
Described adjustment pipe is adjusted current constant according to the reference voltage of the feedback voltage of sample circuit and setting.
With reference to figure 2: the adjustable staircase waveform of stepped-up voltage that is depicted as the embodiment of the present invention produces circuit diagram, and AC sine wave AC, through rectifier bridge rectification, becomes steamed bun ripple.It is 1 o'clock at voltage, m stepped-up voltage regulating networks do not have electric current, the electric current of sampling resistor Rs of flowing through is zero, voltage on sampling resistor Rs is zero, the voltage that feeds back to the negative input end of m operational amplifier is zero, operational amplifier output forward saturation voltage, m metal-oxide-semiconductor M1M2 ... Mm is in complete conducting state.In the time that voltage rises to the voltage of N1 diode current flow that can make first stepped-up voltage regulating networks, first stepped-up voltage regulating networks conducting, has the electric current sampling resistor Rs that flows through.Voltage continues to increase, and electric current increases, and due to the clamped effect of operational amplifier, current constant is at VREF_1/Rs.The terminal voltage of load resistance R1 i.e. the first ladder output voltage is:
V1=R1*VREF_1/Rs
In formula: VREF is applied voltage;
VREF_1 is single order output voltage;
Vt1 is first stepped-up voltage regulating networks diode forward conduction voltage drop;
Input voltage continues to increase, and produces less electric current in the second ladder voltage-regulation network, and the voltage on sampling resistor Rs is increased, and is greater than VREF_1.First via constant current control algorithm amplifier is output as low level, metal-oxide-semiconductor M1 cut-off.Electric current arrives ground by the first stepped-up voltage regulating networks, the second ladder voltage-regulation network, the second tunnel constant current control network, RS.Sample rate current is VREF_2/Rs.The terminal voltage of load resistance R2 i.e. the second ladder output voltage is:
V2=R2*VREF_2/Rs
In formula: VREF is applied voltage;
VREF_2 is second order output voltage;
Vt2 is second stepped-up voltage regulating networks diode forward conduction voltage drop;
The rest may be inferred, N stepped-up voltage regulating networks can produce the staircase waveform of N rank voltage, can obtain by number of diodes in amplitude, frequency and each stepped-up voltage regulating networks of input sine wave and load resistance are set the staircase waveform of different amplitudes.
Above-mentioned conversion process as shown in Figure 3.
Above a kind of ladder wave generation circuit provided by the present invention is described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, in concrete execution mode and range of application, all can change to some extent part, in sum, the present invention should not be construed as limitation of the present invention.
Claims (6)
1. a method that AC sine wave signal is converted into direct current step signal, comprises step:
(1), by AC sine wave signal rectification be direct current steamed bun signal;
(2), steamed bun ripple signal is sent into the voltage regulating device that multiple amplitudes are different, be divided into multistage voltage signal;
(3), each rank voltage signal is sent into respectively to constant-current device, make each rank waveform voltage signal become flat-topped wave; All flat-topped wave voltage signal orders continuously, obtain direct current step signal.
2. a circuit that AC sine wave signal is converted into direct current step signal, comprising:
-rectifier circuit, becomes direct current steamed bun ripple signal by AC sine wave signal rectification;
-multiple voltage regulating devices, and be unified into network, the voltage-regulation set point difference of each voltage regulating device, becomes by direct current steamed bun ripple division of signal the multistage signal that amplitude is different;
-multiple constant-current control devices, its quantity is identical with voltage regulating device, is connected respectively each voltage regulating device, keeps constant for controlling the electric current of each voltage regulating device, and the output signal that makes voltage regulating device is flat-topped wave; All flat-topped wave signal sequences are continuous, become direct current step signal.
3. the circuit that AC sine wave signal is converted into direct current step signal as claimed in claim 2, it is characterized in that: described voltage regulating device is in series by a diode tandem tube group and a load resistance, number of diodes difference in the diode tandem tube group of each voltage regulating device, in the time that direct current steamed bun ripple signal is flowed through voltage-regulation network, act on the dividing potential drop difference of diode tandem tube group, act on the also difference of dividing potential drop on load resistance, thereby direct current steamed bun ripple signal is changed into multistage signal.
4. the circuit that AC sine wave signal is converted into direct current step signal as claimed in claim 2, is characterized in that: described constant-current control device comprises: current sampling unit, reference voltage unit, operational amplifier and adjustment pipe;
Described reference voltage source unit is for generation of constant reference voltage;
Described current sampling unit is for the electric current of sampled voltage adjusting device, and with voltage form to adjusting pipe output feedback signal;
Described operational amplifier is for received current sampled feedback signal and reference voltage, to adjusting pipe output control signal;
Described adjustment pipe keeps constant for the electric current of regulation voltage adjusting device, and the signal output waveform that makes voltage regulating device is flat-topped wave.
5. the circuit that AC sine wave signal is converted into direct current step signal as claimed in claim 4, is characterized in that: described adjustment pipe is one of transistor, metal-oxide-semiconductor, IGBT.
6. the circuit that AC sine wave signal is converted into direct current step signal as claimed in claim 4, is characterized in that: described operational amplifier adopts the integrated circuit operational amplifier of low imbalance 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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| CN201410134085.2A Pending 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 |
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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 |
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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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