CN204633601U - A kind of adjustable constant-voltage constant - Google Patents
A kind of adjustable constant-voltage constant Download PDFInfo
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- CN204633601U CN204633601U CN201520194725.9U CN201520194725U CN204633601U CN 204633601 U CN204633601 U CN 204633601U CN 201520194725 U CN201520194725 U CN 201520194725U CN 204633601 U CN204633601 U CN 204633601U
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Abstract
The utility model provides a kind of adjustable constant-voltage constant, it is characterized in that: it comprises: rectification filtering module, controlled switch voltage reduction module, 5V switch buck module, electric current and voltage adjustment module, electric current and voltage sampling module, OLED display module, described rectification filtering module is connected to civil power by transformer, rectification filtering module is connected with controlled switch voltage reduction module, 5V switch buck module, controlled switch voltage reduction module, 5V switch buck module are connected with electric current and voltage sampling module, controlled switch voltage reduction module are connected with electric current and voltage adjustment module.The utility model uses constant pressure and flow step-down two kinds of control methods, power supply constant voltage can not only be exported, all right constant current output, and can automatically switch under both modes.
Description
Technical field
The utility model relates to power supply field, is specially a kind of adjustable constant-voltage constant.
Background technology
Along with the development of semiconductor technology, at present, a lot of ARM core processor, the operating voltage of DSP, FPGA etc. is more and more lower, but because its internal transistor increases with Moore's Law all the time, the electric current needed is also always in continuous increase, and existing external power source cannot meet this demand, such as, the processor Exynos5422 operating voltage of the integrated GPU of Cortex-A15 framework only has 1.1V, and full-load current is just at more than 6A.Needing integrated PMU on circuit boards in actual use, is the low-voltage high-current power source that chip needs by about 5V voltage transitions.But, in exploitation environment in early stage, often need repeatedly to test supply power voltage electric current, could determine PMU power supply circuits, early stage, chip power supply can only be provided by outside, but existing power supply can not provide so large electric current at lower voltages on market, existing method is reserved the mode of larger surplus, design interim external power source, but this mode adds the workload of developer, cause the construction cycle to extend, and extremely difficulty is investigated once power supply goes wrong.
In addition, the power supply architecture that existing DC power supply majority designs for constant voltage and current limiting, cannot export as constant-current source, or too little as output current during constant-current source.Such as, but along with the development of electronic product, need constant current-supplying, or the automatically switch occasion of power supply of constant voltage/constant current gets more and more, namely great power LED needs constant current-supplying, the charging process of lithium battery need first constant current again constant voltage power.And all need constant-current source to export larger current under these two kinds of application scenarios, existing power supply cannot satisfy the demands.As Chinese patent 201210241608.4, provide a kind of constant voltage and current limiting power supply, cannot constant current output.As Chinese patent 201410032376.0, provide a kind of can the power supply of constant voltage or constant current output, but which employs LM2596 as step-down main control chip, export maximum current and only have 3A, the demand of High-current output of cannot satisfying the demand.
Utility model content
The technical problem that the utility model solves is to provide a kind of adjustable constant-voltage constant, to solve the problem proposed in above-mentioned background technology.
The technical problem that the utility model solves realizes by the following technical solutions: a kind of adjustable constant-voltage constant, comprise: rectification filtering module, controlled switch voltage reduction module, 5V switch buck module, electric current and voltage adjustment module, electric current and voltage sampling module, OLED display module, described rectification filtering module is connected to civil power by transformer, rectification filtering module is connected with controlled switch voltage reduction module, 5V switch buck module, controlled switch voltage reduction module, 5V switch buck module is connected with electric current and voltage sampling module, controlled switch voltage reduction module is connected with electric current and voltage adjustment module.
Described electric current and voltage sampling module is connected with OLED display module, adjustable output interface, USB output interface.
Described controlled switch voltage reduction module uses synchronized model Buck switch topology to carry out step-down, the diode of brachium pontis under traditional B uck topology is replaced with full N-channel MOS pipe, achieve full control copped wave rectification, compared with the buck topology of other linear voltage regulators or non-synchronous type, significantly reduce switching loss, reduce heating, make it the electric current that can export 20V voltage and 10A.Between buck inductor and output filter capacitor, add current sampling resistor, realize current feedback by amplifier resistance both end voltage through current feedback network, thus realize the function of constant current output.Between output capacitance and power supply ground, use resistance pressure-dividing network sampled voltage, realize Voltage Feedback, thus realize the function of constant voltage output.The parameter of resistance pressure-dividing network and current feedback network all can use electric current and voltage sampling module to change, thus it is adjustable to realize electric current and voltage.
Described 5V switch buck module uses the Buck topology of synchronized model equally, provide the constant voltage source of a 5V, maximum output 3A electric current, because 5V voltage source is the power supply be all widely used under various environment, therefore this voltage source is except giving the electric current and voltage sampling module of system, OLED display module is powered, and also draws and uses for outside.
Described electric current and voltage adjustment module, use potentiometer to carry out adjusting resistance values, the feedback resistance value changing voltage feedback network changes output voltage, and the comparative voltage changing current feedback network changes output current, realizes electric current and voltage adjustable.
Described electric current and voltage sampling module, resistance pressure-dividing network is used to sample output voltage, the information of voltage of output is provided to OLED display module, current sampling resistor is used to sample output current, but because the signal be sampled to is too faint, in order to improve precision, employing programmable amplifier to amplify sampled signal, then giving OLED module and carrying out output current sampling.
Described transformer uses that 24V, 200W are mono-exports Industrial Frequency Transformer, for the work of whole system provides the energy.
Described rectification filtering module uses diode bridge to carry out full-bridge rectification, uses π type CLC filter network to carry out filtering, for late-class circuit provides galvanic current source.
Described OLED display module gets electric current and voltage information from electric current and voltage sampling module, processes, and delivers to OLED screen curtain and show after decoding.
Compared with prior art, the beneficial effects of the utility model are: 1, the utility model uses constant pressure and flow step-down two kinds of control methods, power supply constant voltage can not only be exported, all right constant current output, and can automatically switch under both modes.
2, the utility model uses synchronized model high frequency Buck switch buck topology, and uses the low internal resistance metal-oxide-semiconductor of full N raceway groove to be used as switch power level, significantly reduces switching loss, improves step-down efficiency, make this power supply can export big current compared with conventional power source.
3, the utility model uses a road high integration 5V power supply to be used as auxiliary power supply, and it not only can provide the energy for Systematical control and display section, also draws and uses for outside.
4, the utility model use programmable amplifier carrys out the current sampling signal on amplified current sample resistance, solve the drawback of the too small inconvenient quantification treatment of current sampling signal in the past, achieve the high-acruracy survey of electric current, and greatly reduce the internal resistance of source compared with other schemes.
5, the utility model uses self-luminous OLED display screen to carry out the electric current and voltage of the current output of display power supply, and volume is little, and contrast is high, little power consumption, and display effect is eye-catching.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model.
Fig. 2 is controlled switch voltage reduction module circuit diagram of the present utility model.
Fig. 3 is 5V switch buck module circuit diagram of the present utility model.
Fig. 4 is electric current and voltage adjustment module circuit diagram of the present utility model.
Fig. 5 is electric current and voltage sampling module circuit diagram of the present utility model.
Fig. 6 is OLED display module circuit diagram of the present utility model.
Fig. 7 is transformer circuit figure of the present utility model.
Fig. 8 is rectification filtering module circuit diagram of the present utility model.
Embodiment
In order to make actualizing technology means of the present utility model, creation characteristic, reach object and effect is easy to understand, below in conjunction with concrete diagram, set forth the utility model further.
As shown in Figure 1, a kind of adjustable constant-voltage constant, comprise: rectification filtering module, controlled switch voltage reduction module, 5V switch buck module, electric current and voltage adjustment module, electric current and voltage sampling module, OLED display module, described rectification filtering module is connected to civil power by transformer, rectification filtering module is connected with controlled switch voltage reduction module, 5V switch buck module, controlled switch voltage reduction module, 5V switch buck module are connected with electric current and voltage sampling module, controlled switch voltage reduction module are connected with electric current and voltage adjustment module.
Described electric current and voltage sampling module is connected with OLED display module, adjustable output interface, USB output interface.
Described controlled switch voltage reduction module uses synchronized model Buck switch topology to carry out step-down, the diode of brachium pontis under traditional B uck topology is replaced with full N-channel MOS pipe, achieve full control copped wave rectification, compared with the buck topology of other linear voltage regulators or non-synchronous type, significantly reduce switching loss, reduce heating, make it the electric current that can export 20V voltage and 10A.Between buck inductor and output filter capacitor, add current sampling resistor, realize current feedback by amplifier resistance both end voltage through current feedback network, thus realize the function of constant current output.Between output capacitance and power supply ground, use resistance pressure-dividing network sampled voltage, realize Voltage Feedback, thus realize the function of constant voltage output.The parameter of resistance pressure-dividing network and current feedback network all can use electric current and voltage sampling module to change, thus it is adjustable to realize electric current and voltage.
Described 5V switch buck module uses the Buck topology of synchronized model equally, provide the constant voltage source of a 5V, maximum output 3A electric current, because 5V voltage source is the power supply be all widely used under various environment, therefore this voltage source is except giving the electric current and voltage sampling module of system, OLED display module is powered, and also draws and uses for outside.
Described electric current and voltage adjustment module, use potentiometer to carry out adjusting resistance values, the feedback resistance value changing voltage feedback network changes output voltage, and the comparative voltage changing current feedback network changes output current, realizes electric current and voltage adjustable.
Described electric current and voltage sampling module, resistance pressure-dividing network is used to sample output voltage, the information of voltage of output is provided to OLED display module, current sampling resistor is used to sample output current, but because the signal be sampled to is too faint, in order to improve precision, employing programmable amplifier to amplify sampled signal, then giving OLED module and carrying out output current sampling.
Described transformer uses that 24V, 200W are mono-exports Industrial Frequency Transformer, for the work of whole system provides the energy.
Described rectification filtering module uses diode bridge to carry out full-bridge rectification, uses π type CLC filter network to carry out filtering, for late-class circuit provides galvanic current source.
Described OLED display module gets electric current and voltage information from electric current and voltage sampling module, processes, and delivers to OLED screen curtain and show after decoding.
First preferred version of the present utility model is, described controlled switch voltage reduction module, use the synchronous Buck controller of LT3741 constant pressure and flow of Linear company, its buck topology is that full N-channel MOS pipe drives, greatly reduce heating, make it to export large voltage high-current, and under any voltage/current, all can realize constant pressure and flow operation.Switching frequency is set as 300KHz, reduces the inductance value of filtered external inductance and the capacitance of electric capacity significantly, reduces the volume and weight of power supply.
Second preferred version of the present utility model is, described controlled switch voltage reduction module, wherein the upper brachium pontis of Buck power stage uses the AOD4184N channel MOS tube of AOSMD company, conducting resistance 8 milliohm, withstand voltage 40V, maximum current 50A, lower brachium pontis uses the AOD438N channel MOS tube of AOSMD company, conducting resistance 3.5 milliohm, withstand voltage 30V, maximum current 85A, by using full N-channel MOS pipe, significantly can reduce the switching loss in switching process and conduction loss, reducing caloric value, improve step-down efficiency, make power supply can export 20V voltage and 10A electric current.
3rd preferred version of the present utility model is, described 5V switch buck module uses the TPS54335 synchronized model Buck switching regulator of TexasInstrument company, self be integrated with switch MOS pipe, in use only need configuring external inductance capacitance and Voltage Feedback resistance, namely the output of 5V 3A can be provided under the input voltage of 7V to 28V, and reduce volume.
4th preferred version of the present utility model is, described electric current and voltage sampling module, use the INA169 rail-to-rail programmable amplifier of TexasInstrument company, 20 times can be set, 50 times, the multiplication factor of 100 times, and its rail-to-rail characteristic can carry out current sampling from positive source side, is suitable as very much the amplification of current sampling signal.
5th preferred version of the present utility model is, described OLED display module, use the UG-2864HSWEG01 of Univision company, be the 0.96 cun of 12864 spontaneous optical screen of White OLED, during use, do not need outside backlight, and due to its self-luminous characteristic, contrast is very high, can check in the sun, and visible angle can reach 170 °, maximum operating currenbt 28.9mA, reduces the power consumption of display module itself.
Operation principle of the present utility model is: after device powers on, alternating current is transformed into low-voltage AC by transformer module, low-voltage AC becomes low-voltage DC by rectification filtering module, low-voltage DC is divided into two-way, wherein a road enters 5V switch buck module, produce 5V direct current, power to electric current and voltage sampling module and OLED display module, and export as a road, power to external equipment through electric current and voltage sampling module, another road enters controlled switch voltage reduction module, controlled switch voltage reduction module accepts the controling parameters of electric current and voltage adjustment module, during startup, output voltage is first from 0V, increase gradually in 200ms, constantly electric current and voltage is detected in increase process, if any one of voltage/current reaches the set point of electric current and voltage adjustment module, then stop increasing voltage, under lower state, if module work load when constant voltage mode increases, when making output current exceed setting current value, mode of operation can be switched to constant current mode by module, reduces operating voltage until output current is not more than setting electric current, if module work load when constant current mode reduces, when making output current be less than setting current value, module can attempt improving output voltage, attempt to make electric current again reach setting current value, if electric current reaches set point not yet when output voltage is elevated to setting voltage, then module work state switches back constant voltage mode, exports setting voltage.The direct current that controlled voltage reduction module exports is connected to external loading through electric current and voltage sampling module.Electric current and voltage sampling module uses resistance pressure-dividing network to sample output voltage, uses current sampling resistor to sample output current through programmable amplifier, then gives OLED module by the voltage and current signal of sampling.OLED module, by after the voltage and current signal quantification treatment of sampling, is delivered to OLED screen curtain and is shown.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.Claimed scope of the present utility model is defined by appending claims and equivalent thereof.
Claims (6)
1. an adjustable constant-voltage constant, it is characterized in that: it comprises: rectification filtering module, controlled switch voltage reduction module, 5V switch buck module, electric current and voltage adjustment module, electric current and voltage sampling module, OLED display module, described rectification filtering module is connected to civil power by transformer, rectification filtering module is connected with controlled switch voltage reduction module, 5V switch buck module, controlled switch voltage reduction module, 5V switch buck module are connected with electric current and voltage sampling module, controlled switch voltage reduction module are connected with electric current and voltage adjustment module.
2. a kind of adjustable constant-voltage constant according to claim 1, is characterized in that: described electric current and voltage sampling module is connected with OLED display module, adjustable output interface, USB output interface.
3. a kind of adjustable constant-voltage constant according to claim 1, is characterized in that: described transformer uses that 24V, 200W are mono-exports Industrial Frequency Transformer, for the work of whole system provides the energy.
4. a kind of adjustable constant-voltage constant according to claim 1, is characterized in that: described rectification filtering module uses diode bridge to carry out full-bridge rectification, uses π type CLC filter network to carry out filtering, for late-class circuit provides galvanic current source.
5. a kind of adjustable constant-voltage constant according to claim 1, is characterized in that: described controlled switch voltage reduction module comprises the synchronous Buck controller of constant pressure and flow.
6. a kind of adjustable constant-voltage constant according to claim 1, is characterized in that: described OLED display module is the 0.96 cun of 12864 spontaneous optical screen of White OLED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520194725.9U CN204633601U (en) | 2015-04-01 | 2015-04-01 | A kind of adjustable constant-voltage constant |
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| CN201520194725.9U CN204633601U (en) | 2015-04-01 | 2015-04-01 | A kind of adjustable constant-voltage constant |
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| CN204633601U true CN204633601U (en) | 2015-09-09 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676140A (en) * | 2016-01-26 | 2016-06-15 | 山东科技大学 | Precise load current generator of lithium battery |
| CN107681464A (en) * | 2017-09-01 | 2018-02-09 | 歌尔股份有限公司 | A kind of power circuit |
| CN109194120A (en) * | 2018-10-16 | 2019-01-11 | 杨玲 | A kind of buck converter with output protection |
| CN109219188A (en) * | 2018-08-21 | 2019-01-15 | 厦门阳光恩耐照明有限公司 | A kind of RGBW driving circuit |
| CN110323946A (en) * | 2019-07-02 | 2019-10-11 | 北京工业大学 | The power-supply system of magnetic membrane material synthesis based on FPGA control |
| CN110542766A (en) * | 2019-08-22 | 2019-12-06 | 中国船舶重工集团公司第七0七研究所九江分部 | processing circuit suitable for acoustic Doppler measures velocity of flow |
| CN111436178A (en) * | 2019-01-12 | 2020-07-21 | 上海航空电器有限公司 | Aircraft cabin lighting equipment drive circuit with double-ring synchronous control function |
-
2015
- 2015-04-01 CN CN201520194725.9U patent/CN204633601U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676140A (en) * | 2016-01-26 | 2016-06-15 | 山东科技大学 | Precise load current generator of lithium battery |
| CN107681464A (en) * | 2017-09-01 | 2018-02-09 | 歌尔股份有限公司 | A kind of power circuit |
| CN109219188A (en) * | 2018-08-21 | 2019-01-15 | 厦门阳光恩耐照明有限公司 | A kind of RGBW driving circuit |
| CN109194120A (en) * | 2018-10-16 | 2019-01-11 | 杨玲 | A kind of buck converter with output protection |
| CN111436178A (en) * | 2019-01-12 | 2020-07-21 | 上海航空电器有限公司 | Aircraft cabin lighting equipment drive circuit with double-ring synchronous control function |
| CN111436178B (en) * | 2019-01-12 | 2023-08-08 | 上海航空电器有限公司 | Aircraft cabin lighting equipment driving circuit with double-ring synchronous control function |
| CN110323946A (en) * | 2019-07-02 | 2019-10-11 | 北京工业大学 | The power-supply system of magnetic membrane material synthesis based on FPGA control |
| CN110542766A (en) * | 2019-08-22 | 2019-12-06 | 中国船舶重工集团公司第七0七研究所九江分部 | processing circuit suitable for acoustic Doppler measures velocity of flow |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 Termination date: 20160401 |