CN103731124B - A kind of ladder wave generation circuit - Google Patents
A kind of ladder wave generation circuit Download PDFInfo
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- CN103731124B CN103731124B CN201410035966.9A CN201410035966A CN103731124B CN 103731124 B CN103731124 B CN 103731124B CN 201410035966 A CN201410035966 A CN 201410035966A CN 103731124 B CN103731124 B CN 103731124B
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Abstract
The present invention relates to electronic circuit technology, relate to specifically a kind of ladder wave generation circuit. The rectifier circuit that comprises of the present invention, it is characterized in that, also comprise multiple stepped-up voltage regulating networks and multiple constant current control network, described rectifier circuit is connected with stepped-up voltage regulating networks and constant current control network, and described stepped-up voltage regulating networks equate to cut once corresponding connection with the quantity of constant current control network. Beneficial effect of the present invention is, can produce the staircase waveform that exponent number is any, stepped-up voltage is adjustable, and circuit structure is simple simultaneously, there is no Digital Logic control, also do not need programming, can effectively improve circuit utilization ratio. The present invention is particularly useful for ladder wave generation circuit.
Description
Technical Field
The invention relates to the electronic circuit technology, in particular to a step wave generating circuit.
Background
At present, in the field of electronic circuit design, a step wave is a common analog signal. The conventional step wave generator generally has the following two schemes: the first scheme is shown in fig. 1, and comprises a square wave generator, a differential circuit, an amplitude limiting circuit, an integral accumulation circuit, an electronic switch circuit, a comparator and an oscillator circuit, wherein the principle is that a square wave is generated by the square wave generating circuit, and then waveforms with sharp pulses at the upper part and the lower part are obtained by the differential circuit. At this time, only the upper sharp pulse is taken, and the lower half waveform is filtered by the amplitude limiting circuit. When these pulses pass through the integrating and accumulating circuit, a sharp pulse is accumulated to a fixed value, and the next pulse is added with the same value, so that the output forms a step waveform. When the accumulation result does not exceed the threshold of the comparator, the accumulation is continued. And after the threshold is reached, the output voltage of the comparator is reversed, positive voltage is output to enable the oscillation control circuit to work, the square wave is stopped oscillating, meanwhile, the integrating capacitor is discharged to the ground in a short circuit mode, and the capacitor is accumulated after the capacitor recovers the initial state. After the capacitor discharges, the output of the integrator jumps from a negative value to zero, so that the comparator turns over again, the oscillating circuit cannot work, the output of the comparator becomes a negative value, and the whole circuit can normally generate step waves, and the steps are repeated in this way to form a period. Therefore, the scheme is realized by an integrated operational amplifier or a transistor, and although the scheme is simple, the defects are obvious: it is very difficult to generate the step wave with randomly adjustable levels in each step, and all circuits such as the square wave generator and the comparator need to be reset and adjusted, which results in the circuit structure becoming complicated. The second scheme is shown in fig. two, and comprises a clock signal generator, a counter, a CPU and a digital-to-analog converter, and is implemented by mainly controlling and generating a step wave through a programmable device, as compared with the first scheme, the scheme can obtain flexible and variable waveforms, but the scheme needs programming, and limits the application occasions, and on the other hand, the high-speed processor has higher cost, and further limits the application.
Disclosure of Invention
The invention aims to solve the problems of the traditional step wave generating circuit, and provides the step wave generating circuit which is simple in circuit structure and does not need programming.
The technical solution adopted by the present invention to solve the above technical problems is, as shown in fig. 3, including a rectifier bridge circuit, characterized by further including a plurality of step voltage adjusting networks and a plurality of constant current control networks, the rectifier bridge circuit being connected to the step voltage adjusting networks and the constant current control networks, the step voltage adjusting networks being equal in number to the constant current control networks and being connected in sequence and correspondingly; wherein,
the rectifier bridge circuit is used for providing direct current for the step voltage regulating network and the constant current control network;
the step voltage regulating network outputs step electric waves with any order and adjustable step voltage under the control of the constant current control network.
As shown in fig. 4, the constant current control network includes a reference voltage source unit, a current sampling unit, an operational amplifier and an adjusting tube; the current sampling unit is connected with the step voltage adjusting network, the reference voltage source unit and the current sampling unit are connected with the input end of the operational amplifier, the output end of the operational amplifier is connected with the adjusting tube, and the adjusting tube is connected with the step voltage adjusting network; wherein,
the reference voltage unit is used for generating a constant reference voltage and inputting the constant reference voltage to one input end of the operational amplifier;
the current sampling unit is used for regulating the current of the network by the step voltage and feeding back the current to the other input end of the operational amplifier in a voltage form;
the operational amplifier is used for receiving the reference voltage and the sampling voltage and outputting a voltage control signal to the adjusting tube;
the adjusting tube adjusts the current of the step voltage adjusting network according to the control signal of the operational amplifier, and the current of the step voltage adjusting network is kept constant.
The invention has the advantages of generating step waves with any order and adjustable step voltage, along with simple circuit structure, no digital logic control and no programming, and effectively improving the utilization efficiency of the circuit.
Drawings
FIG. 1 is a schematic block diagram of a first conventional step wave circuit;
FIG. 2 is a schematic block diagram of a second conventional step wave circuit;
FIG. 3 is a schematic block diagram of the step wave circuit of the present invention;
FIG. 4 is a more detailed functional block diagram of the step wave circuit of the present invention;
FIG. 5 is a schematic circuit diagram of an embodiment;
FIG. 6 is a schematic diagram of the step wave generated by the embodiment.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings and embodiments:
the capacitance voltage reduction circuit comprises a rectifier bridge circuit and is characterized by further comprising a plurality of step voltage regulation networks and a plurality of constant current control networks, wherein the rectifier bridge circuit is connected with the step voltage regulation networks and the constant current control networks, and the step voltage regulation networks and the constant current control networks are equal in number and are sequentially and correspondingly connected; wherein,
the rectifier bridge circuit is used for providing direct current for the step voltage regulating network and the constant current control network;
the step voltage regulating network outputs step electric waves with any order and adjustable step voltage under the control of the constant current control network.
As shown in fig. 4, the constant current control network includes a reference voltage source unit, a current sampling unit, an operational amplifier and an adjusting tube; the current sampling unit is connected with the step voltage adjusting network, the reference voltage source unit and the current sampling unit are connected with the input end of the operational amplifier, the output end of the operational amplifier is connected with the adjusting tube, and the adjusting tube is connected with the step voltage adjusting network; wherein,
the reference voltage unit is used for generating a constant reference voltage and inputting the constant reference voltage to one input end of the operational amplifier;
the current sampling unit is used for regulating the current of the network by the step voltage and feeding back the current to the other input end of the operational amplifier in a voltage form;
the operational amplifier is used for receiving the reference voltage and the sampling voltage and outputting a voltage control signal to the adjusting tube;
the adjusting tube adjusts the current of the step voltage adjusting network according to the control signal of the operational amplifier, and the current of the step voltage adjusting network is kept constant.
Example (b):
as shown in fig. 5, the AC sine wave AC is rectified by the rectifier bridge and becomes a steamed bread wave. When the voltage is zero, the M stepped voltage regulator 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 amplifier outputs forward saturation voltage, and the M MOS tubes M1M2 … Mm are in a complete conduction state. When the voltage rises to a voltage that may be the turn-on of 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. 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 step output voltage is:
V＝N1*Vt+R1*VREF_l/Rs
vt is the diode forward conduction voltage drop.
And 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 is increased and is greater 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 step output voltage is:
V＝N1*Vt+R1*VREF_2/Rs
vt is the diode forward conduction voltage drop.
In principle, the N step voltage regulating networks can generate step waves of N step voltages, and different step waves can be obtained by setting the amplitude and frequency of input sine waves and the number of diodes and resistors in each step voltage regulating network.
Fig. 6 is a step wave pattern of an embodiment of the present invention, wherein the dotted line is a sine wave rectified by a rectifier bridge, the solid line is a step wave waveform generated by the embodiment, the specific step voltage can be set by the step voltage adjusting network, and the step number can be set by the step voltage adjusting network.
Therefore, the step wave generating circuit realized by the technical scheme of the invention has the following beneficial effects: the step voltage can be of any order and is adjustable; the circuit is simple, digital logic control is not needed, and programming is not needed; when necessary, the power can be directly connected with commercial power for transformation; 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.
Claims (1)
1. A step wave generating circuit comprises a rectifier bridge circuit and is characterized by further comprising a plurality of step voltage regulating networks and a plurality of constant current control networks, wherein the rectifier bridge circuit is connected with the step voltage regulating networks and the constant current control networks, and the step voltage regulating networks and the constant current control networks are equal in number and are sequentially and correspondingly connected; wherein,
the rectifier bridge circuit is used for providing direct current for the step voltage regulating network and the constant current control network;
the step voltage regulating network outputs step electric waves with any order and adjustable step voltage under the control of the constant current control network;
the constant current control network comprises a reference voltage source unit, a current sampling unit, an operational amplifier and an adjusting tube; the current sampling unit is connected with the step voltage adjusting network, the reference voltage source unit and the current sampling unit are connected with the input end of the operational amplifier, the output end of the operational amplifier is connected with the adjusting tube, and the adjusting tube is connected with the step voltage adjusting network; wherein,
the reference voltage unit is used for generating a constant reference voltage and inputting the constant reference voltage to one input end of the operational amplifier;
the current sampling unit is used for regulating the current of the network by the step voltage and feeding back the current to the other input end of the operational amplifier in a voltage form;
the operational amplifier is used for receiving the reference voltage and the sampling voltage and outputting a voltage control signal to the adjusting tube;
the adjusting tube adjusts the current of the step voltage adjusting network according to the control signal of the operational amplifier, and the current of the step voltage adjusting network is kept constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035966.9A CN103731124B (en) | 2014-01-24 | 2014-01-24 | A kind of ladder wave generation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410035966.9A CN103731124B (en) | 2014-01-24 | 2014-01-24 | A kind of ladder wave generation circuit |
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| CN103731124A CN103731124A (en) | 2014-04-16 |
| CN103731124B true CN103731124B (en) | 2016-05-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872987A (en) * | 2014-04-03 | 2014-06-18 | 电子科技大学 | Method and circuit for converting alternating-current sine wave signals into direct-current step wave signals |
| CN104270140A (en) * | 2014-09-09 | 2015-01-07 | 张小亚 | Gateway wave generator composed of double hold amplifiers |
| CN104410392B (en) * | 2014-10-11 | 2017-03-29 | 昆山龙腾光电有限公司 | A kind of notch cuttype clock signal generating circuit |
| CN114208026A (en) * | 2021-06-16 | 2022-03-18 | 深圳市汇顶科技股份有限公司 | Power amplifier, chip and terminal equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3628055A (en) * | 1969-12-18 | 1971-12-14 | Sylvania Electric Prod | Staircase waveform generator |
| CN1085699A (en) * | 1992-10-16 | 1994-04-20 | 凌阳科技股份有限公司 | Analog type step wave generator |
| CN201590809U (en) * | 2009-11-10 | 2010-09-22 | 中兴通讯股份有限公司 | Stepped-wave generating device |
| CN103199729A (en) * | 2013-04-10 | 2013-07-10 | 国家电网公司 | Modularization multi-level converter submodule grouping stair wave modulation method |
-
2014
- 2014-01-24 CN CN201410035966.9A patent/CN103731124B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3628055A (en) * | 1969-12-18 | 1971-12-14 | Sylvania Electric Prod | Staircase waveform generator |
| CN1085699A (en) * | 1992-10-16 | 1994-04-20 | 凌阳科技股份有限公司 | Analog type step wave generator |
| CN201590809U (en) * | 2009-11-10 | 2010-09-22 | 中兴通讯股份有限公司 | Stepped-wave generating device |
| CN103199729A (en) * | 2013-04-10 | 2013-07-10 | 国家电网公司 | Modularization multi-level converter submodule grouping stair wave modulation method |
Non-Patent Citations (1)
| Title |
|---|
| "基于EWB的阶梯波发生器的电路设计";徐淑英;《武汉船舶职业技术学院学报》;20061025;第65页左栏第一段至第68页右栏第三段 * |
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| CN103731124A (en) | 2014-04-16 |
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