CN204721221U - The control circuit of DC/DC switch power source output voltage - Google Patents
The control circuit of DC/DC switch power source output voltage Download PDFInfo
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- CN204721221U CN204721221U CN201520474705.7U CN201520474705U CN204721221U CN 204721221 U CN204721221 U CN 204721221U CN 201520474705 U CN201520474705 U CN 201520474705U CN 204721221 U CN204721221 U CN 204721221U
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Abstract
The utility model relates to the control circuit of DC/DC switch power source output voltage, wherein said storage battery output voltage is the input voltage of above-mentioned power supply, sample circuit comprises R5, R6, reference voltage circuit comprises R7, D1, voltage comparator circuit comprises U2, R8, R9, R10, R12, output voltage sampling circuit comprises R13, R14, it is characterized in that allowing the output voltage of storage battery, the output voltage of Discrete control DC/DC Switching Power Supply, storage battery output voltage is when more than 12.5V, and power supply exports the constant voltage of a 12.2V; When accumulator electric-quantity drops to 2/3rds of available capacity, namely when storage battery output voltage is lower than 12.5V, power supply exports the constant low voltage of another 11.4V thereupon, the beneficial effects of the utility model are, solve LED street lamp forward and backward brightness at night different, after midnight compared with the problem that the first half of the night, brightness reduced by half, in autumn and winter, the large and small automatic conversion of spring and summer time power output, autumn, winter or continuously a couple of days overcast and rainy, haze time LED can continue luminescence and work, avoid extinguishing completely.
Description
Technical field
The utility model relates to electronic technology field, specifically a kind of control circuit of DC/DC switch power source output voltage.
Background technology
In the street lamp illumination system application taking solar cell as the energy, there is many technical problems: the carried charge of storage battery has except relation except the power with solar cell, Various Seasonal, different weather environment can have influence on the size of charge in batteries electricity, for the state that storage battery is different, the output voltage of LED power or electric current must make corresponding adjustment, current LED power Problems existing is that output voltage or electric current are in the autumn and winter, how the spring and summer period is arranged, overcast and rainy continuously in experience, during haze weather, how to make automatic adjustment according to the size of the existing electricity of storage battery, autumn, winter, light application time was short, the electric energy of solar cell conversion is relative to the spring, summer will be lacked, but, autumn, season in winter two is again than the spring, summer, evening hours was long, make the spring, during summer, electric energy is superfluous, autumn, electric energy wretched insufficiency during winter, cause the autumn, night in winter, because accumulators store little energy, just extinguish after LED street lamp work is not long-time, lose the effect of illumination, at continuous wet weather, also there is same problem in the period of haze, although period load after midnight reduces by half, function obtains application now, but, it is completed after load segment by time controller, can not fundamentally solve above-mentioned Problems existing, and add a power main in installing after load segment, increase engineering cost.
Summary of the invention
Technical problem to be solved in the utility model overcomes the deficiencies in the prior art, a kind of control circuit of DC/DC switch power source output voltage is provided, the utility model solves the technical scheme that its technical problem adopts: structure of the present utility model comprises power input P1, power output end P2, input voltage, sample circuit, reference voltage circuit, voltage comparator circuit, output voltage sampling circuit, pwm pulse adjusts wide U1, wherein said storage battery output voltage is the input voltage of above-mentioned power supply, sample circuit comprises R5, R6, reference voltage circuit comprises R7, D1, voltage comparator circuit comprises U2, R8, R9, R10, R12, output voltage sampling circuit comprises R13, R14, it is characterized in that allowing the output voltage of storage battery, the i.e. input voltage of power supply, the output voltage of Discrete control DC/DC Switching Power Supply, storage battery output voltage is when more than 12.5V, power supply exports the constant voltage of a 12.2V, when accumulator electric-quantity drops to 2/3rds of available capacity, namely when storage battery output voltage is lower than 12.5V, power supply exports the constant low voltage of another 11.4V thereupon, input voltage sample circuit is connected with power input P1 after being connected by R5 and R6, the voltage at R6 two ends be sampling voltage it centered by 6V on, lower change, current-limiting resistance R7 and D1 is connected with power input P1 after connecting, the reference voltage of 6V is obtained at D1 two ends, the reference voltage of 6V and power supply input sampling voltage and are added in respectively on R8 and R9 of voltage comparator circuit, electric power output voltage sample circuit R13 and R14 is connected on power output end P2 after connecting, R13 voltage to earth adjusts the 7th pin of stretch circuit U1 to be connected as pulse width modulated control voltage and pwm pulse, by the duty ratio of its control impuls, pulse width modulated voltage is subject to the two ore control of input voltage and output voltage, when power input voltage is greater than 12.5V, voltage comparator circuit output voltage is 0V, the constant voltage of the output 12.2V of DC/DC Switching Power Supply, at this moment three resistance R10, R12, the tie point of R13 is equivalent to ground connection, when power input voltage is lower than 12.5V, voltage comparator circuit exports a 6V voltage, 6V voltage is through R10, R12 series connection divides the two ends being pressed in R10 to define the voltage of 0.03V, the pulse width modulated magnitude of voltage that this voltage provides by R13 increases, thus make to carry DC/DC switch power source output voltage and reduce to 11.4V, output voltage controlling circuit by the output of DC/DC Switching Power Supply to battery-operated time span, weather environment, indirectly make corresponding reflection season.
The beneficial effects of the utility model are, the utility model is according to battery capacity and LED voltage-current characteristic, by actual measurement and computing, give 12.2V and the 11.4V size of two kinds of different output voltages, adapt to the needs under Various Seasonal, different weather condition with this.Give the battery-operated voltage drop of nominal value 12V in addition to 12.5V, as the condition that electric power output voltage adjusts automatically, solve LED street lamp forward and backward brightness at night different, after midnight compared with the problem that the first half of the night, brightness reduced by half, can in autumn and winter, the large and small automatic conversion of spring and summer time power output, autumn, winter or continuously a couple of days overcast and rainy, haze time LED can continue luminescence and work, avoid extinguishing completely.
Accompanying drawing explanation
Fig. 1: the utility model circuit theory diagrams.
The control circuit element model of electric power output voltage and parameter thereof in figure: U1-ML5118, U2-LM358, R5-10.5K, R6-3.4K, R7-10.5K, R8-1K, R9-1K, R10-17 Ω, R12-3.4K, R13-1.0K, R14-8.87K, D1-IN5233.
Embodiment
Illustrate with reference to accompanying drawing and following concrete detailed description is done to the utility model, as shown in drawings, structure of the present utility model comprises power input P1, power output end P2, input voltage, sample circuit, reference voltage circuit, voltage comparator circuit, output voltage sampling circuit, pwm pulse adjusts wide U1, wherein said storage battery output voltage is the input voltage of above-mentioned power supply, sample circuit comprises R5, R6, reference voltage circuit comprises R7, D1, voltage comparator circuit comprises U2, R8, R9, R10, R12, output voltage sampling circuit comprises R13, R14, it is characterized in that allowing the output voltage of storage battery, the i.e. input voltage of power supply, the output voltage of Discrete control DC/DC Switching Power Supply, storage battery output voltage is when more than 12.5V, power supply exports the constant voltage of a 12.2V, when accumulator electric-quantity drops to 2/3rds of available capacity, namely when storage battery output voltage is lower than 12.5V, power supply exports the constant low voltage of another 11.4V thereupon, input voltage sample circuit is connected with power input P1 after being connected by R5 and R6, the voltage at R6 two ends be sampling voltage it centered by 6V on, lower change, current-limiting resistance R7 and D1 is connected with power input P1 after connecting, the reference voltage of 6V is obtained at D1 two ends, the reference voltage of 6V and power supply input sampling voltage and are added in respectively on R8 and R9 of voltage comparator circuit, electric power output voltage sample circuit R13 and R14 is connected on power output end P2 after connecting, R13 voltage to earth adjusts the 7th pin of stretch circuit U1 to be connected as pulse width modulated control voltage and pwm pulse, by the duty ratio of its control impuls, pulse width modulated voltage is subject to the two ore control of input voltage and output voltage, when power input voltage is greater than 12.5V, voltage comparator circuit output voltage is 0V, the constant voltage of the output 12.2V of DC/DC Switching Power Supply, at this moment three resistance R10, R12, the tie point of R13 is equivalent to ground connection, when power input voltage is lower than 12.5V, voltage comparator circuit exports a 6V voltage, 6V voltage is through R10, R12 series connection divides the two ends being pressed in R10 to define the voltage of 0.03V, the pulse width modulated magnitude of voltage that this voltage provides by R13 increases, thus make to carry DC/DC switch power source output voltage and reduce to 11.4V, output voltage controlling circuit by the output of DC/DC Switching Power Supply to battery-operated time span, weather environment, indirectly make corresponding reflection season.
Embodiment recited above is only be described preferred implementation of the present utility model; not design of the present utility model and scope are limited; under the prerequisite not departing from the utility model design concept; the various modification that in this area, common engineers and technicians make the technical solution of the utility model and improvement; protection range of the present utility model all should be fallen into; the technology contents of the utility model request protection, all records in detail in the claims.
Claims (1)
- The control circuit of 1.DC/DC switch power source output voltage, comprise power input P1, power output end P2, input voltage, sample circuit, reference voltage circuit, voltage comparator circuit, output voltage sampling circuit, pwm pulse adjusts wide U1, wherein said storage battery output voltage is the input voltage of above-mentioned power supply, sample circuit comprises R5, R6, reference voltage circuit comprises R7, D1, voltage comparator circuit comprises U2, R8, R9, R10, R12, output voltage sampling circuit comprises R13, R14, it is characterized in that allowing the output voltage of storage battery, the i.e. input voltage of power supply, the output voltage of Discrete control DC/DC Switching Power Supply, storage battery output voltage is when more than 12.5V, power supply exports the constant voltage of a 12.2V, when accumulator electric-quantity drops to 2/3rds of available capacity, namely when storage battery output voltage is lower than 12.5V, power supply exports the constant low voltage of another 11.4V thereupon, input voltage sample circuit is connected with power input P1 after being connected by R5 and R6, the voltage at R6 two ends be sampling voltage it centered by 6V on, lower change, current-limiting resistance R7 and D1 is connected with power input P1 after connecting, the reference voltage of 6V is obtained at D1 two ends, the reference voltage of 6V and power supply input sampling voltage and are added in respectively on R8 and R9 of voltage comparator circuit, electric power output voltage sample circuit R13 and R14 is connected on power output end P2 after connecting, R13 voltage to earth adjusts the 7th pin of stretch circuit U1 to be connected as pulse width modulated control voltage and pwm pulse, by the duty ratio of its control impuls, pulse width modulated voltage is subject to the two ore control of input voltage and output voltage, when power input voltage is greater than 12.5V, voltage comparator circuit output voltage is 0V, the constant voltage of the output 12.2V of DC/DC Switching Power Supply, at this moment three resistance R10, R12, the tie point of R13 is equivalent to ground connection, when power input voltage is lower than 12.5V, voltage comparator circuit exports a 6V voltage, 6V voltage is through R10, R12 series connection divides the two ends being pressed in R10 to define the voltage of 0.03V, the pulse width modulated magnitude of voltage that this voltage provides by R13 increases, thus make to carry DC/DC switch power source output voltage and reduce to 11.4V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520474705.7U CN204721221U (en) | 2015-06-30 | 2015-06-30 | The control circuit of DC/DC switch power source output voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520474705.7U CN204721221U (en) | 2015-06-30 | 2015-06-30 | The control circuit of DC/DC switch power source output voltage |
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| Publication Number | Publication Date |
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| CN204721221U true CN204721221U (en) | 2015-10-21 |
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| CN201520474705.7U Expired - Fee Related CN204721221U (en) | 2015-06-30 | 2015-06-30 | The control circuit of DC/DC switch power source output voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358295A (en) * | 2018-09-20 | 2019-02-19 | 北京时代民芯科技有限公司 | A kind of power failure indicating circuit applied to DC-DC |
-
2015
- 2015-06-30 CN CN201520474705.7U patent/CN204721221U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358295A (en) * | 2018-09-20 | 2019-02-19 | 北京时代民芯科技有限公司 | A kind of power failure indicating circuit applied to DC-DC |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20160630 |
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| CF01 | Termination of patent right due to non-payment of annual fee |