CN105915204A - Soft starting circuit for output signal of digital signal source chip - Google Patents
Soft starting circuit for output signal of digital signal source chip Download PDFInfo
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- CN105915204A CN105915204A CN201610434995.1A CN201610434995A CN105915204A CN 105915204 A CN105915204 A CN 105915204A CN 201610434995 A CN201610434995 A CN 201610434995A CN 105915204 A CN105915204 A CN 105915204A
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- digital signal
- chip
- control circuit
- output
- soft start
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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Abstract
The invention discloses a soft starting circuit for output signals of a digital signal source chip. The circuit comprises a single chip microcomputer, the digital signal source chip, and a soft starting control circuit formed by a MosFET. According to the circuit, through combination of the single chip microcomputer, the digital signal source chip and the soft starting control circuit, the defect of relatively long transient process when signals are produced and closed by the output waveforms of the digital signal chip is overcome, and the transient impact to a post-stage circuit is avoided.
Description
Technical field
The present invention relates to a kind of soft starting circuit, particularly to a kind of derived digital signal chip signal output soft starting circuit.
Background technology
The waveform output that direct digital signal synthesizing (DDS) technology produces has the plurality of advantages such as wider frequency range, of a relatively high precision, the less distortion factor, faster conversion speed.But the signal moment generated based on digital signal source technology, the dynamic response time of circuit is long, after final-stage power amplifier amplifies, testing element is produced the phenomenons such as bigger surge voltage, overcurrent, the reliably working of test equipment is produced serious harm.Meanwhile, the power consumption of magnetic core element is more sensitive to excitation waveform, and the transient-wave of distortion can affect measuring accuracy.
Summary of the invention
In order to overcome the transient process of DDS chip signal output moment and turn off time delay process, the transition effects such as the overvoltage of elimination final-stage power amplifier appearance and overcurrent, the present invention provides a kind of derived digital signal chip signal output soft starting circuit, by single-chip microcomputer, digital signal source chip, the combination of SS (soft start) control circuit, realize output signal soft start, can effectively overcome the transient process of derived digital signal chip signal output moment and turn off time delay process so that tested magnetics obtains preferable excitation waveform.
The present invention solves above-mentioned technical problem by the following technical solutions:
The present invention provides a kind of derived digital signal chip signal output soft starting circuit, and including single-chip microcomputer, digital signal source chip, SS (soft start) control circuit, wherein, single-chip microcomputer is connected with SS (soft start) control circuit, in order to control conducting and the shutoff of SS (soft start) control circuit；The output of digital signal source chip is connected with SS (soft start) control circuit, and when SS (soft start) control circuit turns on, the output signal of digital signal source chip is shielded by SS (soft start) control circuit；When SS (soft start) control circuit turns off, the output signal of digital signal source chip is exported to late-class circuit by SS (soft start) control circuit.
As the further prioritization scheme of the present invention, the control port of single-chip microcomputer is connected with SS (soft start) control circuit, controls SS (soft start) control circuit by Single-chip Controlling port output waveform.
As the further prioritization scheme of the present invention, the I/O port of single-chip microcomputer is connected with digital signal source chip, in order to control the output waveform of digital signal source chip.
As the further prioritization scheme of the present invention, SS (soft start) control circuit is MosFET, and wherein, single-chip microcomputer is connected with the grid of MosFET, and digital signal source chip is connected with the drain electrode of MosFET, the source ground of MosFET.
Further prioritization scheme as the present invention, this circuit also includes the first to the 3rd resistance and an electric capacity, SS (soft start) control circuit is MosFET, wherein, single-chip microcomputer is connected with the grid of MosFET, one end of electric capacity respectively by the first resistance, the other end of electric capacity and the source electrode of MosFET ground connection respectively, and the drain electrode of MosFET is connected with one end, one end of the 3rd resistance of the second resistance respectively, the other end of the second resistance is connected with the output of digital signal source chip, the other end ground connection of the 3rd resistance；The drain electrode of MosFET, the second resistance, the 3rd resistance common port as the output of this soft starting circuit, to rear class circuit output signal.
The present invention uses above technical scheme compared with prior art, have following technical effect that the present invention can obtain stable output signal, can effectively overcome the transient process of derived digital signal chip signal output moment and turn off time delay process, overcome the transient process impact to late-class circuit, make tested magnetics obtain preferable excitation waveform.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the derived digital signal chip signal output soft starting circuit that the preferred embodiments of the present invention realize.
When Fig. 3 is not have soft start function, derived digital signal chip signal output starts transient-wave.
When Fig. 4 is not have soft start function, derived digital signal chip signal output turns off transient-wave.
When Fig. 5 is to have soft start function, derived digital signal chip signal output starts transient-wave.
When Fig. 6 is to have soft start function, derived digital signal chip signal output turns off transient-wave.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of described embodiment is shown in the drawings, and the most same or similar label represents same or similar element or has the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
It is understood that unless expressly stated, singulative used herein " ", " one ", " described " and " being somebody's turn to do " may also comprise plural form to those skilled in the art of the present technique.Should be further understood that, the wording used in the description of the present invention " includes " referring to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existence or adds other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that when we claim element to be " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or can also there is intermediary element.Additionally, " connection " used herein or " coupling " can include wireless connections or couple.Wording "and/or" used herein includes one or more any cell listing item being associated and all combinations.
Those skilled in the art of the present technique it is understood that unless otherwise defined, all terms used herein (including technical term and scientific terminology) have with the those of ordinary skill in art of the present invention be commonly understood by identical meaning.Should also be understood that those terms defined in such as general dictionary should be understood that have the meaning consistent with the meaning in the context of prior art, and unless defined as here, will not explain by idealization or the most formal implication.
Below in conjunction with the accompanying drawings technical scheme is described in further detail:
In order to overcome the transient process of DDS chip signal output moment and turn off time delay process, the transition effects such as the overvoltage of elimination final-stage power amplifier appearance and overcurrent, the present invention proposes a kind of derived digital signal chip signal output soft starting circuit, as shown in Figure 1, including single-chip microcomputer, digital signal source chip, SS (soft start) control circuit, wherein, single-chip microcomputer is connected with SS (soft start) control circuit, in order to control conducting and the shutoff of SS (soft start) control circuit；The output of digital signal source chip is connected with SS (soft start) control circuit, and when SS (soft start) control circuit turns on, the output signal of digital signal source chip is shielded by SS (soft start) control circuit；When SS (soft start) control circuit turns off, the output signal of digital signal source chip is exported to late-class circuit by SS (soft start) control circuit.The control port of single-chip microcomputer is connected with SS (soft start) control circuit, controls SS (soft start) control circuit by Single-chip Controlling port output waveform；The I/O port of single-chip microcomputer is connected with digital signal source chip, in order to control the output waveform of digital signal source chip.
In the present invention, first control instruction is write the pumping signal needed for digital signal source chip produces by single-chip microcomputer, opens SS (soft start) control circuit simultaneously, and now module does not has signal to export.After the transient state time that time delay is certain, closing SS (soft start) control circuit, now module exports desired signal waveform.
The specific embodiment of the invention is as follows: the model of single-chip microcomputer is STC89C52, the model of digital signal source chip is AD9834, and SS (soft start) control circuit is the N-channel MosFET of 2N7002 model.As shown in Figure 2, the control port P0.0 of single-chip microcomputer is connected with grid G, one end of electric capacity C1 of MosFET respectively by resistance R1, the other end of electric capacity C1 and the source S of MosFET ground connection respectively, the drain D of MosFET is connected with one end, one end of resistance R3 of resistance R2 respectively, the other end of resistance R2 is connected with the output of digital signal source chip, the other end ground connection of resistance R3；The drain D of MosFET, resistance R2, resistance R3 common port as the output of this soft starting circuit, to rear class circuit output signal.
As in figure 2 it is shown, Q1 is MosFET pipe 2N7002, the drain electrode of Q1 is connected between AD9834 output port and rear class signal.The conducting of Q1 pipe is controlled by Single-chip Controlling port P0.0 with turning off, when P0.0 sets high level, and Q1 pipe turns on, and the output signal of shielding AD9834；When needs signal generating module output signal, P0.0 sets low level, and Q1 pipe is closed, and the output signal of AD9834 can be supplied to late-class circuit.In whole auto test flow, suitable time delay process is introduced by SS (soft start) control circuit, there is provided sufficient response time to digital signal source chip and filter circuit, thus avoid signal to generate transient response process and the signal attenuation process of turn off process of moment.
Without soft starting circuit, directly provided signal by digital signal source chip for late-class circuit.Fig. 3 shows that signal output module is generated sinusoidal wave opening process oscillogram by 0 V；Fig. 4 shows that sine wave signal output is changed to the turn off process oscillogram of 0 V.Test result indicate that, when directly being produced output signal and cut-off signals by digital signal source chip, exist and significantly start impulse overvoltage, simultaneously turn off process the veryest long, be unfavorable for the test of late-class circuit.After rear class power amplification circuit amplifies, there is more serious harm to equipment in such transient signal.
By introducing soft starting circuit, Fig. 5 shows that signal output module is generated sinusoidal wave opening process oscillogram by 0 V；Fig. 6 shows that sine wave signal output is changed to the turn off process oscillogram of 0 V.Compared with Fig. 3, Fig. 4, test result indicate that, when signal source produces output signal and cut-off signals, do not produce startup impulse overvoltage, simultaneously turn off process very fast.
The above; it is only the detailed description of the invention in the present invention; but protection scope of the present invention is not limited thereto; any it is familiar with the people of this technology in the technical scope that disclosed herein; it is appreciated that the conversion or replacement expected; all should contain within the scope of the comprising of the present invention, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (5)
1. a derived digital signal chip signal output soft starting circuit, it is characterised in that including single-chip microcomputer, digital signal source chip, SS (soft start) control circuit, wherein, single-chip microcomputer is connected with SS (soft start) control circuit, in order to control conducting and the shutoff of SS (soft start) control circuit；The output of digital signal source chip is connected with SS (soft start) control circuit, and when SS (soft start) control circuit turns on, the output signal of digital signal source chip is shielded by SS (soft start) control circuit；When SS (soft start) control circuit turns off, the output signal of digital signal source chip is exported to late-class circuit by SS (soft start) control circuit.
A kind of derived digital signal chip signal output soft starting circuit the most according to claim 1, it is characterised in that the control port of single-chip microcomputer is connected with SS (soft start) control circuit, controls SS (soft start) control circuit by Single-chip Controlling port output waveform.
A kind of derived digital signal chip signal output soft starting circuit the most according to claim 1, it is characterised in that the I/O port of single-chip microcomputer is connected with digital signal source chip, in order to control the output waveform of digital signal source chip.
A kind of derived digital signal chip signal output soft starting circuit the most according to claim 1, it is characterised in that SS (soft start) control circuit is MosFET, wherein, single-chip microcomputer is connected with the grid of MosFET, and digital signal source chip is connected with the drain electrode of MosFET, the source ground of MosFET.
A kind of derived digital signal chip signal output soft starting circuit the most according to claim 1, it is characterized in that, this circuit also includes the first to the 3rd resistance and an electric capacity, SS (soft start) control circuit is MosFET, wherein, single-chip microcomputer is connected with the grid of MosFET, one end of electric capacity respectively by the first resistance, the other end of electric capacity and the source electrode of MosFET ground connection respectively, the drain electrode of MosFET is connected with one end, one end of the 3rd resistance of the second resistance respectively, the other end of the second resistance is connected with the output of digital signal source chip, the other end ground connection of the 3rd resistance；The drain electrode of MosFET, the second resistance, the 3rd resistance common port as the output of this soft starting circuit, provide pumping signal to late-class circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610434995.1A CN105915204A (en) | 2016-06-17 | 2016-06-17 | Soft starting circuit for output signal of digital signal source chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610434995.1A CN105915204A (en) | 2016-06-17 | 2016-06-17 | Soft starting circuit for output signal of digital signal source chip |
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| Publication Number | Publication Date |
|---|---|
| CN105915204A true CN105915204A (en) | 2016-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610434995.1A Pending CN105915204A (en) | 2016-06-17 | 2016-06-17 | Soft starting circuit for output signal of digital signal source chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230162938A1 (en) * | 2021-11-24 | 2023-05-25 | Jess-Link Products Co., Ltd. | Circuit element protection apparatus and protection method for circuit elements |
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| US20100141226A1 (en) * | 2008-12-04 | 2010-06-10 | Denso Corporation | Switching power circuit and power supply method |
| CN102510276A (en) * | 2011-11-01 | 2012-06-20 | 华南理工大学 | Big-power module high-frequency driver with non-neural advance mechanism |
| CN203027228U (en) * | 2012-12-20 | 2013-06-26 | 深圳Tcl新技术有限公司 | Soft start electronic switch and direct current power supply |
| CN205693643U (en) * | 2016-06-17 | 2016-11-16 | 南京邮电大学 | A kind of derived digital signal chip signal output soft starting circuit |
-
2016
- 2016-06-17 CN CN201610434995.1A patent/CN105915204A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100141226A1 (en) * | 2008-12-04 | 2010-06-10 | Denso Corporation | Switching power circuit and power supply method |
| CN102510276A (en) * | 2011-11-01 | 2012-06-20 | 华南理工大学 | Big-power module high-frequency driver with non-neural advance mechanism |
| CN203027228U (en) * | 2012-12-20 | 2013-06-26 | 深圳Tcl新技术有限公司 | Soft start electronic switch and direct current power supply |
| CN205693643U (en) * | 2016-06-17 | 2016-11-16 | 南京邮电大学 | A kind of derived digital signal chip signal output soft starting circuit |
Non-Patent Citations (1)
| Title |
|---|
| 彭波: "基于DDS的多通道电磁振动台控制系统", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20230162938A1 (en) * | 2021-11-24 | 2023-05-25 | Jess-Link Products Co., Ltd. | Circuit element protection apparatus and protection method for circuit elements |
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