CN102916587A - Digital adjustable bipolar high-voltage power supply - Google Patents
Digital adjustable bipolar high-voltage power supply Download PDFInfo
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- CN102916587A CN102916587A CN2012103713139A CN201210371313A CN102916587A CN 102916587 A CN102916587 A CN 102916587A CN 2012103713139 A CN2012103713139 A CN 2012103713139A CN 201210371313 A CN201210371313 A CN 201210371313A CN 102916587 A CN102916587 A CN 102916587A
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Abstract
The invention discloses a digital adjustable bipolar high-voltage power supply. Firstly, a direct-current voltage is boosted by a boosted circuit, and an intuitive digital voltage regulating command is sent out by a micro-controller at a center control part; and then, the voltage regulating command is converted into an analog signal by a digital-to-analog conversion circuit, and a linear voltage regulating circuit for receiving a high voltage of an input end can output a required voltage according to the analog signal of the voltage regulating command. The digital adjustable bipolar high-voltage power supply can meet the requirements under different working conditions, and the product applicability is improved.
Description
Technical field
The present invention relates to a kind of digital adjustable double polarity high voltage source.
Background technology
The output voltage of the high voltage source that occurs in the existing market is generally all unadjustable, perhaps can only be by manually carrying out analog regulation, and degree of regulation is poor, can't satisfy the demand of prior art.And generally power supply all is unipolar, namely only has the output of positive voltage, and the present invention is the adjustable output of positive negative bipolar high pressure.
Summary of the invention
The object of the invention is to provide a kind of digital adjustable double polarity high voltage source, and it can realize the classification of power supply bipolar voltage adjustable, and each step voltage can be adjustable by the microcontroller stepping, can satisfy the power requirement under the different operating modes.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of digital adjustable double polarity high voltage source, described digital adjustable double polarity high voltage source comprises:
Input power, described input power be+5V ~+DC power supply of 20V;
Described input power access DC/DC booster circuit;
Described DC/DC booster circuit links to each other with microcontroller and is subjected to described microprocessor controls, described DC/DC booster circuit output two-way high voltage is delivered to respectively (this linear voltage regulating circuit is realized the bipolar voltage regulation output, and namely one road positive high voltage and one road negative high voltage are regulated) in the linear voltage regulating circuit in a linear voltage regulating circuit;
Described linear voltage regulating circuit is regulated output voltage according to the instruction that D/A converting circuit sends;
Described D/A converting circuit links to each other with microcontroller, described microcontroller sends the voltage-regulation instruction, described D/A converting circuit is according to described voltage-regulation instruction output aanalogvoltage, and described aanalogvoltage is delivered to the realization of linear voltage regulating circuit to the control of described linear voltage regulating circuit.
For technique scheme, the optimization implementing measure that the inventor also makes progress.
As optimization, the output of described digital adjustable double polarity power is provided with current detection circuit, described current detection circuit detects supply voltage and output current, detection obtains supply voltage and output current is sent to microcontroller after the analog to digital conversion circuit sample conversion, and described microcontroller is preserved the data that collect and compared management with set point.
As optimization; be provided with differential amplifier circuit between described analog to digital conversion circuit and current detecting unit; described differential amplifier circuit is closed linear voltage regulator circuit for detection of the voltage difference that detects the resistance two ends in the current detection circuit when voltage is excessive, realize the overcurrent protection of power supply.
As optimization, described input voltage is+5V ~+20V; The high-tension magnitude of voltage of two-way that described DC/DC booster circuit is exported is respectively+100V ,-100V, electric current is 100mA.
As optimization, the resolution of the digital to analog converter in the described D/A converting circuit is 8bit; The resolution of the analog to digital converter in the described analog to digital conversion circuit is 12bit.
With respect to scheme of the prior art, advantage of the present invention is:
1. digital adjustable double polarity high voltage source described in the invention, at first adopt booster circuit that direct voltage is boosted, send digital voltage regulating command directly perceived in middle control part by microcontroller, by D/A converting circuit this voltage-regulation instruction transformation is become analog signal again, receive the high-tension linear voltage regulating circuit of input and then can according to the analog signal of above-mentioned voltage-regulation instruction, export needed voltage.Thereby the present invention can satisfy the demand under the different operating modes, raising product applicability;
2. also added current detection circuit among the present invention, current detection circuit detects output voltage, the electric current of power supply, and is sent to microcontroller during with fructufy and processes preservation.The present invention utilizes differential amplifier circuit to detect the voltage at current sense resistor two ends, realizes the monitoring to linear voltage regulating circuit output current.When output current was excessive, microcontroller cut out linear voltage regulator circuit.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is the overall structure theory diagram of the embodiment of the invention;
Fig. 2 is the circuit theory diagrams of DC/DC booster circuit in the embodiment of the invention;
Fig. 3 is the circuit theory diagrams of D/A converting circuit in the embodiment of the invention;
Fig. 4 is the circuit theory diagrams of embodiment of the invention neutral line voltage regulator circuit;
Fig. 5 is the circuit theory diagrams of differential amplifier circuit in the embodiment of the invention.
Embodiment
Below in conjunction with specific embodiment such scheme is described further.Should be understood that these embodiment are not limited to limit the scope of the invention for explanation the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment:
Present embodiment has been described a kind of digital adjustable double polarity high voltage source, its structural principle block diagram as shown in Figure 1, described digital adjustable double polarity high voltage source comprises:
Input power,
Described input power access DC/DC booster circuit, the input voltage of described input power be+5V ~+20V;
Described DC/DC booster circuit links to each other with microcontroller and is subjected to described microprocessor controls, described DC/DC booster circuit output two-way high voltage is delivered to respectively in the two linear voltage regulating circuits, the high-tension magnitude of voltage of two-way that described DC/DC booster circuit is exported is respectively+100V ,-100V, electric current is 100mA;
Described linear voltage regulating circuit is regulated output voltage according to the instruction that D/A converting circuit sends, and the resolution of the digital to analog converter in the described D/A converting circuit is 8bit;
Described D/A converting circuit links to each other with microcontroller, described microcontroller sends the voltage-regulation instruction, described D/A converting circuit is according to described voltage-regulation instruction output aanalogvoltage, and described aanalogvoltage is delivered to the realization of linear voltage regulating circuit to the control of described linear voltage regulating circuit.
The output of described digital adjustable double polarity power is provided with current detection circuit, described current detection circuit detects supply voltage and output current, detection obtains supply voltage and output current is sent to microcontroller after the analog to digital conversion circuit sample conversion, and described microcontroller is preserved the data that collect and compared management with set point.The resolution of the analog to digital converter in the described analog to digital conversion circuit is 12bit.
Be provided with differential amplifier circuit between described analog to digital conversion circuit and current detecting unit; described differential amplifier circuit is for detection of the voltage difference at the detection resistance two ends of current detection circuit; when voltage difference is excessive; be that linear voltage regulating circuit output current is closed linear voltage regulator circuit when excessive, realize the overcurrent protection to power supply.
The effect of DC/DC booster circuit be general+5V that input power is inputted ~+the 20V direct voltage boosts to+100V and-high pressure of 100V, physical circuit is as shown in Figure 2.In normal operation, when oscillator arranges the PWM latch, GATE pin output high level, power MOSFET conducting; When IC internal current comparator resets latch, GATE pin output low level, power MOSFET turn-offs.Output voltage is by forming feedback voltage to the FB pin after the divider resistance dividing potential drop, the error amplifier of chip internal compares feedback voltage FB and an inner 1.230V voltage reference, and in error signal of ITH pin output.Voltage on the ITH pin is set the input threshold of current comparator.When load current increased, the decline of FB voltage relative datum voltage was risen the ITH pin level, and this causes the chip internal current comparator a larger peak inductor current value saltus step to occur.Average inductive current will increase, until equate with load current, keep thus voltage stabilizing output.
D/A converting circuit as shown in Figure 3, this D/A converting circuit be by microcontroller by SPI interface control digital to analog converter, the output voltage of D/A converting circuit is 0 ~ 2.048V.Digital to analog converter is the 8bit Voltage-output digital to analog converter of a SPI interface, and 2.7V ~ 5.5V powers by single supply.Physical circuit is when work, inputted first the data of one group of 16bit to digital to analog converter by the SPI interface by microcontroller, be used for arranging mode of operation and the reference voltage of digital to analog converter, reference voltage is for adopting in the sheet+the 1.024V reference voltage, output voltage range be 0V ~+2.048V(0V to 2 is times to reference voltage); Set up microcontroller after the above parameter and input again the data of one group of 16bit to digital to analog converter, be used for arranging the output voltage of TLV5624CD.
As shown in Figure 3, DIN, SCLK, CS, FS are respectively data input pin, clock, sheet choosing, the sequential gating of SPI interface, and DAOUT is the lead-out terminal of digital to analog converter.The output voltage of digital to analog converter flows to the linear voltage regulating circuit, make linear voltage regulating circuit output 0V ~+adjustable voltage of 100V/-100V.
Corresponding relation between the output voltage of digital to analog converter output voltage and linear voltage regulating circuit is as follows:
The linear voltage regulator circuit of digital to analog converter output voltage
+2.048V +100V -100V
… … …
+1.536V +75V -75V
… … …
+1.024V +50V -50V
… … …
+0.512V +25V -25V
Described linear voltage regulating circuit as shown in Figure 4, DAIN is the output of DA among the figure, also is the input of linear voltage regulating circuit analog signal.Among the figure the first half be 0V ~+regulating circuit of 100V, among the figure the latter half be 0V ~-regulating circuit of 100V.
In the adjusting part of positive voltage, operational amplifier A DA4841-2 and R48, R49 consist of a homophase amplifying circuit, so that at the output of 1 pin of operational amplifier A DS4841-2 and DAIN voltage magnitude, phase place the same voltage all.Short according to void, empty disconnected principle is the * 9.1 (TX+ is output voltage) of TX+/(68.1+68.1+68.1+9.1) at the voltage of 6 pin of ADS4841-2 as can be known again, then exports a negative voltage at 7 pin of operational amplifier A DA4841-2.The TXEN end is the control end of the linear voltage regulator circuit output of control, and when TXEN output high level, the 6 pin chip enable ends of 74HC4052 are low level.
74HC4052 is analog switch, and its truth table is as follows:
So, when the 74HC4052 gating, its 1 pin output low level, thus so that the base stage of triode Q5 is 0V, owing to its emission integrates as negative voltage, thus triode Q5 conducting, and work in the range of linearity, thus open linear voltage regulator circuit.
Its specific works process is as follows: at first because triode Q5 is in conducting state, triode Q3 flows through the conducting of triode Q5 collector electrode because of base current, the emitter current of triode Q3 is so that R39 produces pressure drop, because this pressure drop acts between the GS of metal-oxide-semiconductor M3 too, so the M3 conducting also works in the range of linearity, the output of regulation voltage.
Triode Q4 is used for the effect of linear voltage regulating circuit current limliting, when electric power outputting current increases, pressure drop on the R36 also can increase thereupon, when electric current increases to certain value (pressure drop on the R36 surpasses 0.6V), triode Q4 conducting, thus the electric current on the triode Q3 base stage is diminished, reduced the voltage between the GS of metal-oxide-semiconductor M3, thereby reduce output current, realize the purpose of current limliting.
And the principle of the negative voltage of linear voltage regulating circuit part (schematic diagram the latter half) is identical with the principle of positive voltage part, does not repeat them here.
And current detection circuit adopts the precision resistance of 1 Ω as the detection resistance that detects electric current, namely the current value of power supply output is converted to magnitude of voltage.When being 50mA such as the electric current that flows through on the precision resistance, the voltage difference at precision resistance two ends is 0.05V; When electric current was 100mA, the voltage difference at precision resistance two ends was 0.1V.
The current foldback circuit that differential amplifier circuit consists of as shown in Figure 5.The differential amplification device is INA117KU, is used for obtaining detecting the voltage difference at resistance two ends.Detect resistance and be placed between 2 pin and 3 pin of INA117KU, the voltage difference at 6 pin of INA117KU output precision resistance two ends: Vo=V3-V2.The specific works process is as follows: behind the gating of the output voltage of differential amplifier INA117 through analog switch 74HC4052; give voltage comparator TLV2372 and carry out voltage ratio; when the output voltage of INA117 surpasses the threshold values that comparator sets (the corresponding output current value of 0.107V is 107mA); the comparator level upset; the output high level; trigger d type flip flop 74HC74 and latch, thereby close linear voltage regulator circuit, realize overcurrent protection.
Current detection circuit detects the electric power output voltage and the output current that obtain and be sent to microcontroller after the analog to digital conversion circuit sampling; described microcontroller i.e. the output current of monitoring power supply at any time; when electric current output surpasses 150mAh; be that the data of analog to digital conversion circuit sampling are greater than 010111010001; just think overcurrent; trigger overcurrent protection, the output of powered-down.
Above-mentioned example only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the people who is familiar with technique can understand content of the present invention and according to this enforcement, can not limit protection scope of the present invention with this.All equivalent transformations that Spirit Essence is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (7)
1. a digital adjustable double polarity high voltage source is characterized in that, described digital adjustable double polarity high voltage source comprises:
Input power;
Described input power access DC/DC booster circuit;
Described DC/DC booster circuit links to each other with microcontroller and is subjected to described microprocessor controls, and described DC/DC booster circuit output two-way high voltage is delivered to respectively in the linear voltage regulating circuit;
Described linear voltage regulating circuit is regulated output voltage according to the instruction that D/A converting circuit sends;
Described D/A converting circuit links to each other with microcontroller, described microcontroller sends the voltage-regulation instruction, described D/A converting circuit is according to described voltage-regulation instruction output aanalogvoltage, and described aanalogvoltage is delivered to the realization of linear voltage regulating circuit to the control of described linear voltage regulating circuit.
2. digital adjustable double polarity high voltage source according to claim 1, it is characterized in that, the output of described digital adjustable double polarity power is provided with current detection circuit, described current detection circuit detects supply voltage and output current, detection obtains supply voltage and output current is sent to microcontroller after the analog to digital conversion circuit sample conversion, and described microcontroller is preserved the data that collect and compared management with set point.
3. digital adjustable double polarity high voltage source according to claim 2; it is characterized in that; be provided with differential amplifier circuit between described analog to digital conversion circuit and current detecting unit; described differential amplifier circuit is for detection of the voltage difference that detects the resistance two ends in the current detection circuit; when voltage is excessive, close linear voltage regulator circuit, realize the overcurrent protection of power supply.
4. digital adjustable double polarity high voltage source according to claim 1 is characterized in that, described input voltage is+and 5V ~+20V.
5. digital adjustable double polarity high voltage source according to claim 1 is characterized in that, the high-tension magnitude of voltage of two-way that described DC/DC booster circuit is exported is respectively+100V ,-100V, electric current is 100mA.
6. digital adjustable double polarity high voltage source according to claim 1 is characterized in that the resolution of the digital to analog converter in the described D/A converting circuit is 8bit.
7. digital adjustable double polarity high voltage source according to claim 2 is characterized in that the resolution of the analog to digital converter in the described analog to digital conversion circuit is 12bit.
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| CN201210371313.9A CN102916587B (en) | 2012-09-27 | 2012-09-27 | Digital adjustable bipolar high-voltage power supply |
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| CN201210371313.9A CN102916587B (en) | 2012-09-27 | 2012-09-27 | Digital adjustable bipolar high-voltage power supply |
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| CN102916587B CN102916587B (en) | 2015-05-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311878A (en) * | 2013-04-24 | 2013-09-18 | 华南理工大学 | Bipolar electrical stimulation protection device |
| CN106100292A (en) * | 2016-08-22 | 2016-11-09 | 上海怿星电子科技有限公司 | A kind of small power DC power supply able to programme and power configuration method |
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| JPH053674A (en) * | 1991-06-25 | 1993-01-08 | Matsushita Electric Works Ltd | Switching power supply |
| JPH1169812A (en) * | 1997-08-19 | 1999-03-09 | Matsushita Electric Ind Co Ltd | Power supply unit for crt |
| CN101505093A (en) * | 2009-03-09 | 2009-08-12 | 哈尔滨工业大学 | Multipath output electrical power suitable for space environment |
| CN101926219A (en) * | 2008-01-28 | 2010-12-22 | 奥斯兰姆有限公司 | The driver of optical projection system |
| CN202818112U (en) * | 2012-09-27 | 2013-03-20 | 苏州中傲信息技术有限公司 | Digital adjustable bipolar high-voltage power supply |
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2012
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH053674A (en) * | 1991-06-25 | 1993-01-08 | Matsushita Electric Works Ltd | Switching power supply |
| JPH1169812A (en) * | 1997-08-19 | 1999-03-09 | Matsushita Electric Ind Co Ltd | Power supply unit for crt |
| CN101926219A (en) * | 2008-01-28 | 2010-12-22 | 奥斯兰姆有限公司 | The driver of optical projection system |
| CN101505093A (en) * | 2009-03-09 | 2009-08-12 | 哈尔滨工业大学 | Multipath output electrical power suitable for space environment |
| CN202818112U (en) * | 2012-09-27 | 2013-03-20 | 苏州中傲信息技术有限公司 | Digital adjustable bipolar high-voltage power supply |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311878A (en) * | 2013-04-24 | 2013-09-18 | 华南理工大学 | Bipolar electrical stimulation protection device |
| CN103311878B (en) * | 2013-04-24 | 2016-03-02 | 华南理工大学 | A kind of bipolar electrical stimulation protection device |
| CN106100292A (en) * | 2016-08-22 | 2016-11-09 | 上海怿星电子科技有限公司 | A kind of small power DC power supply able to programme and power configuration method |
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| CN102916587B (en) | 2015-05-06 |
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Address after: 215000, Suzhou, Suzhou Industrial Park, No. 99 love road, D612, Patentee after: Pride in Intelligent Technology (Suzhou) Co., Ltd. Address before: Wei Ting Zhen Xing Cheng Road, Suzhou city of Jiangsu Province, No. 9 215122 Patentee before: Suzhou Zhongao Information Technology Co.,Ltd. |