CN203104300U - Switch power supply with adjustable maximum power - Google Patents
Switch power supply with adjustable maximum power Download PDFInfo
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- CN203104300U CN203104300U CN 201220694161 CN201220694161U CN203104300U CN 203104300 U CN203104300 U CN 203104300U CN 201220694161 CN201220694161 CN 201220694161 CN 201220694161 U CN201220694161 U CN 201220694161U CN 203104300 U CN203104300 U CN 203104300U
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Abstract
The utility model discloses switch power supply with adjustable maximum power; the switch power supply comprises a 220V AC power terminal, a rectification filter circuit, a MOS pipe, a transformer, a filter circuit and a switch power supply output terminal all connected in sequence; and the switch power supply also comprises a feedback circuit, a PWM control IC, a resistor switching circuit and a CPU. In the switch power supply with adjustable power, the CPU determines a power needed by electronic equipment according to returned voltage sampling signals and PWM signals, sends control instructions to the resistor switching circuit, thereby switching to a resistor corresponding with the power, and adjusting frequency of the PWM signals outputted by the PWM control IC through the resistor, so output power of the switch power supply is further adjusted. Compared with the prior art, the switch power supply with adjustable maximum power is not limited by a rated power of electronic equipment, is low in cost, and saves power.
Description
Technical field
The utility model relates to the switch power technology field, relates in particular to a kind of maximum power Adjustable switch power supply.
Background technology
Along with the high speed development of power electronic technology, the relation of power electronic equipment and people's work, life is also close day by day, and electronic equipment all be unable to do without reliable power supply.Power supply provides the device of electric energy, be each electronic equipment indispensable pith.The size of power, whether electric current and voltage is stable, will directly influence the service behaviour and the useful life of electronic equipment.The classification of power supply is a lot, and the power supply of being used always in the electronic equipment mostly is the Switching Power Supply that directly can connect civil power.
In the existing Switching Power Supply, because the maximum power that transformer transmitted is a definite value, so can reduce the required number of turn of transformer coil by the operating frequency that increases Switching Power Supply, thereby reduce the volume of transformer, but higher operating frequency will increase loss, electromagnetic interference and the ripple of Switching Power Supply.General Switching Power Supply, its operating frequency is exactly changeless after selected, and Switching Power Supply can be to work with this frequency always, so its peak power output is also fixed.But such Switching Power Supply only is applicable in the constant electronic equipment of rated power to have certain limitation.
In the practical application, the peak power output of power supply will satisfy the needed maximum power of load, for example the rated operational voltage of an electronic equipment is 5V, its peak current can reach 4A, so power supply just must selection can provide the power supply of 20W power at least, but this electronic equipment is not the power that always needs to provide 20W, it only just need provide so high power when full load is moved, and the time of full load operation, actual can't be for a long time, only account for very little time scale, in fact this electronic equipment is under the state that is not in full load, the power supply of 10W just can satisfy the demands, but the power supply that we select still will select to satisfy the power supply of 20W power output, thereby has increased the cost of electronic equipment and wasted electric energy.
Therefore, existing Switching Power Supply have that the limitation that is subjected to load rating power is big, the cost that increases electronic equipment and the defective of waste electric energy.
The utility model content
The technical problems to be solved in the utility model is, a kind of maximum power Adjustable switch power supply is provided, with the cost that solves existing Switching Power Supply and be subjected to the limitation of electronic equipment rated power big, increase electronic equipment and the defective of waste electric energy.
For solving the problems of the technologies described above, the utility model adopts following technical scheme.
A kind of maximum power Adjustable switch power supply, it includes a 220V AC power end, a current rectifying and wave filtering circuit, a metal-oxide-semiconductor, a transformer, a filter circuit and a Switching Power Supply output that connects successively, and described Switching Power Supply also includes a feedback circuit, a PWM control IC, a resistance commutation circuit and a CPU; Described feedback circuit is used to gather filter circuit filtering voltage afterwards, and will feed back to PWM control IC and CPU after this voltage dividing potential drop; Described PWM control IC is used for the output pulse width modulation signal to metal-oxide-semiconductor, and this pulse-width signal is used to control the ON/OFF of metal-oxide-semiconductor and feeds back to CPU as feedback signal; Described CPU is used for exporting control command to the resistance commutation circuit according to this voltage sampling signal and this pulse-width signal; Described resistance commutation circuit includes an analogue quantity switch and a plurality of resistance, one end of a plurality of resistance is connected to the multi-channel input of analogue quantity switch, the pulse frequency that the other end of a plurality of resistance all is connected to the PWM control IC is provided with end, the output head grounding of described analogue quantity switch, described resistance commutation circuit is used for according to the control command of CPU the resistance corresponding with this control command being connected to the PWM control IC, and makes the electric capacity of this resistance and PWM control IC inside constitute the RC oscillating circuit.
Preferably, the resistance quantity that multi-channel input connected of described analogue quantity switch is 2.
In the disclosed maximum power Adjustable switch of the utility model power supply, voltage sampling signal and pulse-width signal that CPU passes through to be fed back are judged the required power of electronic equipment, afterwards, send control command to the resistance commutation circuit, make analogue quantity switch optionally open and switch to and the corresponding resistance of this power, make an end ground connection of this resistance, the other end is connected to the PWM control IC and constitutes the RC oscillating circuit with the electric capacity of PWM control IC inside, adjust the frequency of the pulse-width signal of PWM control IC output by the frequency of oscillation of this RC oscillating circuit, the ON/OFF that is used for the driven MOS pipe owing to this pulse-width signal is adjusted the magnetic flux density of transformer, so the power output of Switching Power Supply has been made further adjustment, has made it reach the required power of electronic equipment.When CPU judges electronic equipment and needs other power, similarly send control command to the resistance commutation circuit, make analogue quantity switch optionally open and switch to other resistance, and further adjust the power output of Switching Power Supply by the frequency of adjusting pulse-width signal.Switching Power Supply disclosed in the utility model, because its power output can be regulated according to the required power of electronic equipment, so it is not subjected to the limitation of electronic equipment rated power, that simultaneously, adopts electronic equipment of the present utility model also has an advantage that can reduce cost, save electric energy.
Description of drawings
Fig. 1 is the circuit block diagram of the maximum power Adjustable switch power supply that the utility model proposed.
Fig. 2 is the circuit block diagram of resistance commutation circuit.
Embodiment
Below in conjunction with drawings and Examples the utility model is done more detailed description.
The utility model discloses a kind of maximum power Adjustable switch power supply, in conjunction with Figure 1 and Figure 2, it includes a 220V AC power end 1, a current rectifying and wave filtering circuit 2, a metal-oxide-semiconductor 3, a transformer 4, a filter circuit 5 and a Switching Power Supply output 6 that connects successively, and described Switching Power Supply also includes a feedback circuit 7, a PWM control IC 8, a resistance commutation circuit 9 and a CPU10.Wherein:
Described feedback circuit 7 is used to gather filter circuit 5 filtering voltage afterwards, and will feed back to PWM control IC 8 and CPU10 after this voltage dividing potential drop.
Described PWM control IC 8 is used for the output pulse width modulation signal to metal-oxide-semiconductor 3, and this pulse-width signal is used to control the ON/OFF of metal-oxide-semiconductor 3 and feeds back to CPU10 as feedback signal.
Described CPU10 is used for exporting control command to resistance commutation circuit 9 according to this voltage sampling signal and this pulse-width signal;
Described resistance commutation circuit 9 includes an analogue quantity switch 90 and a plurality of resistance, one end of a plurality of resistance is connected to the multi-channel input of analogue quantity switch 90, the pulse frequency that the other end of a plurality of resistance all is connected to PWM control IC 8 is provided with end, the output head grounding of described analogue quantity switch 90, described resistance commutation circuit 9 is used for according to the control command of CPU10 the resistance corresponding with this control command being connected to PWM control IC 8, and makes the electric capacity of this resistance and PWM control IC 8 inside constitute the RC oscillating circuit.
Present embodiment is 20W with rated power, and operating frequency is that the Switching Power Supply of 200KHZ is an example.In conjunction with Figure 1 and Figure 2, the resistance quantity that multi-channel input connected of described analogue quantity switch 90 is 2, wherein, the frequency that resistance R 1 is used for pulse-width signal that PWM control IC 8 is exported is adjusted into 100KZH, and the frequency that resistance R 2 is used for pulse-width signal that PWM control IC 8 is exported is adjusted into 200KHZ.When electronic equipment is not in the full load operation, if the power output of 10W can satisfy its power demand, can make Switching Power Supply be operated in 100KHz, that is to say, the former operating frequency 200KHZ of Switching Power Supply need be dropped to half, the variation speed of its electric current also becomes original half, because the coil turn of transformer 4 does not change, so the magnetic flux density in the magnetic field that transformer 4 produces also will be original half, the power that transformer is all exported also will be half, promptly obtain the power supply of 10W, PWM control IC 8 is regulated the duty ratio of its pulse-width signal and is exported metal-oxide-semiconductor 3 to according to the voltage sampling signal that feedback circuit 7 is fed back simultaneously, opens and closes the time interval to regulate metal-oxide-semiconductor 3, thereby reach the purpose of control power output, therefore, frequency that can be by transferring pulse-width signal is to 100KHZ, and makes the power output of Switching Power Supply reach 10W, at this moment, the duty ratio of this pulse-width signal will reach 80%.When electronic equipment is in full load when operation, improve the magnetic flux density in magnetic field with said method similarly, reach 200KHZ until the output frequency of pulse-width signal, thereby the power output that realizes Switching Power Supply reaches 20W.
Based on above operation principle, can adopt following method and the power output of by-pass cock power supply.When the electronic equipment needs are more high-power, CPU10 judges by voltage sampling signal and pulse-width signal, if the duty ratio of pulse-width signal has reached 80%, and feedback voltage has decline, illustrate that electronic equipment needs bigger power output, at this moment, CPU10 control analogue quantity switch 90 is optionally open-minded, make an end ground connection of this resistance R 2, the other end is connected to PWM control IC 8 and constitutes the RC oscillating circuit with the electric capacity of PWM control IC 8 inside, adjust the frequency of the pulse-width signal of PWM control IC 8 outputs by the frequency of oscillation of this RC oscillating circuit, make the frequency of this pulse-width signal rise to 200KHz, this moment, the peak power output of power supply reached 20W.When electronic equipment needs smaller power, CPU10 is by the duty ratio of voltage sampling signal and pulse-width signal, judge and do not need high-power output this moment, then CPU10 optionally is connected to PWM control IC 8 with resistance R 1 by control analogue quantity switch 90, and readjust the RC frequency of oscillation, drop to 100KHz again with the operating frequency that makes Switching Power Supply.
Should be noted that, pass through convert resistance R1 and resistance R 2 in the said process, the power output of Switching Power Supply can be adjusted into 10W and 20W, but this is a preferred embodiment of the present utility model, be not limited to the utility model, in other embodiment of the present utility model, the resistance of greater number can also be set, and be connected to the pulse-width signal that PWM control IC 8 adjusts a plurality of frequencies by resistance with a plurality of resistances, thereby Switching Power Supply can be switched between a plurality of output frequencies, make Switching Power Supply have the advantage of flexible Application.
In the disclosed maximum power Adjustable switch of the utility model power supply, voltage sampling signal and pulse-width signal that CPU10 passes through to be fed back are judged the required power of electronic equipment, afterwards, send control command to resistance commutation circuit 9, make analogue quantity switch 90 optionally open and switch to and the corresponding resistance of this power, make an end ground connection of this resistance, the other end is connected to PWM control IC 8 and constitutes the RC oscillating circuit with the electric capacity of PWM control IC 8 inside, adjust the frequency of the pulse-width signal of PWM control IC 8 outputs by the frequency of oscillation of this RC oscillating circuit, because this pulse-width signal is used for the ON/OFF of driven MOS pipe 3, and the magnetic flux density of adjustment transformer 4, so the power output of Switching Power Supply has been made further adjustment, has made it reach the required power of electronic equipment.When CPU10 passes through the voltage sampling signal that fed back and pulse-width signal and judges electronic equipment and need other power, similarly send control command to resistance commutation circuit 9, make analogue quantity switch 90 optionally open and switch to other resistance, and further adjust the power output of Switching Power Supply by the frequency of adjusting pulse-width signal.Switching Power Supply disclosed in the utility model, because its power output can be regulated according to the required power of electronic equipment, so it is not subjected to the limitation of electronic equipment rated power, that simultaneously, adopts electronic equipment of the present utility model also has an advantage that can reduce cost, save electric energy.
The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of being made in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.
Claims (2)
1. maximum power Adjustable switch power supply, it is characterized in that, described Switching Power Supply includes a 220V AC power end (1), a current rectifying and wave filtering circuit (2), a metal-oxide-semiconductor (3), a transformer (4), a filter circuit (5) and a Switching Power Supply output (6) that connects successively, and described Switching Power Supply also includes a feedback circuit (7), a PWM control IC (8), a resistance commutation circuit (9) and a CPU(10);
Described feedback circuit (7) is used to gather the voltage after filter circuit (5) filtering, and will feed back to PWM control IC (8) and CPU(10) after this voltage dividing potential drop;
Described PWM control IC (8) is used for the output pulse width modulation signal to metal-oxide-semiconductor (3), and this pulse-width signal is used to control the ON/OFF of metal-oxide-semiconductor (3) and feeds back to CPU(10 as feedback signal);
Described CPU(10) is used for exporting control command to resistance commutation circuit (9) according to this voltage sampling signal and this pulse-width signal;
Described resistance commutation circuit (9) includes an analogue quantity switch (90) and a plurality of resistance, one end of a plurality of resistance is connected to the multi-channel input of analogue quantity switch (90), the pulse frequency that the other end of a plurality of resistance all is connected to PWM control IC (8) is provided with end, the output head grounding of described analogue quantity switch (90), described resistance commutation circuit (9) is used for according to CPU(10) control command and the resistance corresponding with this control command is connected to PWM control IC (8), and make the inner electric capacity of this resistance and PWM control IC (8) constitute the RC oscillating circuit.
2. Switching Power Supply as claimed in claim 1 is characterized in that, the resistance quantity that multi-channel input connected of described analogue quantity switch (90) is 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220694161 CN203104300U (en) | 2012-12-14 | 2012-12-14 | Switch power supply with adjustable maximum power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220694161 CN203104300U (en) | 2012-12-14 | 2012-12-14 | Switch power supply with adjustable maximum power |
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| Publication Number | Publication Date |
|---|---|
| CN203104300U true CN203104300U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220694161 Expired - Fee Related CN203104300U (en) | 2012-12-14 | 2012-12-14 | Switch power supply with adjustable maximum power |
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| CN (1) | CN203104300U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036447A (en) * | 2012-12-14 | 2013-04-10 | 深圳市新国都技术股份有限公司 | Maximum power adjustable switching power supply |
-
2012
- 2012-12-14 CN CN 201220694161 patent/CN203104300U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036447A (en) * | 2012-12-14 | 2013-04-10 | 深圳市新国都技术股份有限公司 | Maximum power adjustable switching power supply |
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Legal Events
| Date | Code | Title | Description |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20191214 |