CN201639499U - Switch power supply with ultra-wide input range - Google Patents
Switch power supply with ultra-wide input range Download PDFInfo
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- CN201639499U CN201639499U CN2009202619576U CN200920261957U CN201639499U CN 201639499 U CN201639499 U CN 201639499U CN 2009202619576 U CN2009202619576 U CN 2009202619576U CN 200920261957 U CN200920261957 U CN 200920261957U CN 201639499 U CN201639499 U CN 201639499U
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Abstract
The utility model relates to a switch power supply with an ultra-wide input range, which comprises an alternating-current-to-direct-current converting circuit, a voltage-reduction converting circuit and a PWM control circuit, wherein the voltage-reduction converting circuit comprises a first capacitor, a second capacitor and a control circuit, wherein the first capacitor is connected with the alternating-current-to-direct-current converting circuit; the second capacitor is connected with the first capacitor in series; and the control circuit is connected with the first capacitor and the second capacitor and used for controlling the first capacitor and the second capacitor to be connected in series for working when high voltage is input to the alternating-current-to-direct-current converting circuit, and for controlling the first capacitor to work only when low voltage is input. The switch power supply with ultra-wide input range can meet the requirement on ultra-wide input range and voltage resistance, and reduces the occupied volume and the cost of the capacitors.
Description
Technical field
The utility model relates to a kind of power supply, relates in particular to super wide input range Switching Power Supply step-down conversion circuit.
Background technology
According to the requirement of power department, the input voltage range of ammeter power supply should be positive and negative 1.9 times of rated voltage, is about the alternating voltage of 65-460 volt, and the power supply of this type is called the Switching Power Supply of super wide input range.In step-down (BUCK) translation circuit of super wide input range Switching Power Supply, when selecting BUCK electric capacity according to power output, the load voltage value of electric capacity is the twice of the BUCK electric capacity of non-super wide input, such as, the Switching Power Supply of a non-super wide input range of 20W of design only needs a 47UF/400V electric capacity, and the Switching Power Supply that designs a super wide input range of 20W then needs the electric capacity of two 100UF/400V.
Therefore in the BUCK of super wide input range Switching Power Supply circuit, must use the electric capacity of two 100UF/400V to string together formation BUCK electric capacity in order to satisfy super wide input range and withstand voltage requirement, will make that like this total capacity has reduced half, in addition, also can increase shared volume of electric capacity and electric capacity cost.
The utility model content
The purpose of this utility model is to provide a kind of super wide input range Switching Power Supply and to the method for alternating voltage step-down conversion, satisfying super wide input range and withstand voltage requirement, and shared volume and the electric capacity cost of minimizing electric capacity.
The utility model provides a kind of super wide input range Switching Power Supply, comprise AC-to DC translation circuit, step-down conversion circuit, DC-to-DC reduction voltage circuit and pwm control circuit, step-down conversion circuit comprises first electric capacity, is connected with the AC-to DC translation circuit; Second electric capacity is with first capacitances in series; Control circuit is connected with first electric capacity and second electric capacity, is used for controlling first electric capacity and the second capacitances in series work when AC-to DC translation circuit input high pressure, and when input low pressure, control has only the first electric capacity work.
Preferably, above-mentioned control circuit comprises switching tube Q3, pressurizer Q4 and resistance R 3, and wherein the drain electrode of switching tube Q3 and source electrode are connected with the two ends of second electric capacity respectively, and grid is connected with second end of pressurizer Q4; The 3rd end ground connection of pressurizer Q4, first end is connected with the drain electrode of switching tube Q3 by resistance R 3.
Preferably, above-mentioned control circuit also comprises the 3rd capacitor C 6, resistance R 15 and sample resistance R24, wherein the two ends of the 3rd capacitor C 6 and resistance R 15 are connected with second end and the 3rd end of pressurizer Q4 respectively, and the two ends of sample resistance R24 are connected with the 3rd end and first end of pressurizer Q4 respectively.
Preferably, above-mentioned control circuit also comprises resistance R 17 and R18, and wherein said R17 is in parallel with described first electric capacity with the series circuit that R18 forms.
Preferably, above-mentioned control circuit also comprises resistance R 19 and R20, and wherein R19 is in parallel with described second electric capacity with the series circuit that R20 forms, and connects with the series circuit that R18 forms with described R17.
Preferably, above-mentioned control circuit also comprises resistance R 12 and R25, and the series circuit that wherein said R12 and R25 form is with after described the 3rd capacitor C 6 is connected, and is in parallel with the series circuit of described first electric capacity and second electric capacity composition again.
Preferably, above-mentioned control circuit also comprises sample resistance R27, R28, R29 and the 4th capacitor C 10, wherein the 4th capacitor C 10 is in parallel with sample resistance R24, and sample resistance R27, R28, R29 and the 4th capacitor C 10 are formed after the series circuit, and be in parallel with the series circuit of described first electric capacity and second electric capacity composition again.
The super wide input range Switching Power Supply that the utility model embodiment provides can satisfy super wide input range and withstand voltage requirement, reduces shared volume and the electric capacity cost of electric capacity.
Description of drawings
Figure 1 shows that the structural representation of a kind of embodiment of the super wide input range Switching Power Supply of the utility model;
Figure 2 shows that the circuit diagram of step-down conversion circuit shown in Figure 1.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme described in the utility model is described in further detail, so that those skilled in the art can better understand the utility model and being implemented, but illustrated embodiment is not as to qualification of the present utility model.
Figure 1 shows that the structural representation of a kind of embodiment of the super wide input range Switching Power Supply of the utility model.
Super wide input range Switching Power Supply 10 comprises AC-to DC translation circuit 101, step-down conversion circuit 102, DC-to-DC reduction voltage circuit 103 and pwm control circuit 104.Wherein, step-down conversion circuit 102 is connected with AC-to DC translation circuit 101, and DC-to-DC reduction voltage circuit 103 is connected with step-down conversion circuit 102, and pwm control circuit 104 is connected with DC-to-DC reduction voltage circuit 103.
AC-to DC translation circuit 101 is used for alternating voltage is become direct voltage.Pwm control circuit 104 is used to control the direct voltage that step-down conversion circuit 102 and DC-to-DC reduction voltage circuit 103 exported AC-to DC translation circuit 101 to carry out exporting after the step-down.
Figure 2 shows that the circuit diagram of step-down conversion circuit shown in Figure 1.
The circuit of step-down conversion circuit comprises first capacitor C 8, second capacitor C 7 and the control circuit.
First capacitor C 8 is connected with AC-to DC translation circuit 101.Second capacitor C 7 is connected with first capacitor C 8.Control circuit is connected with first capacitor C 8 and second capacitor C 7, is used for controlling first capacitor C 8 and 7 tandem workings of second capacitor C when AC-to DC translation circuit 101 input high pressure, and when input low pressure, control has only 8 work of described first capacitor C.
The particular circuit configurations of control circuit is as follows, and control circuit comprises switching tube Q3, pressurizer Q4 and resistance R 3, and wherein the drain electrode of switching tube Q3 and source electrode are connected with the two ends of second capacitor C 7 respectively, and grid is connected with second end of pressurizer Q4; The 3rd end ground connection of pressurizer Q4, first end is connected with the drain electrode of switching tube Q3 by resistance R 3.In the present embodiment, switching tube Q3 can be that triode also can make relay etc. have the electronic devices and components of on-off action.
In addition, control circuit also comprises the 3rd capacitor C 6, resistance R 15 and sample resistance R24, wherein the two ends of the 3rd capacitor C 6 and resistance R 15 are connected with second end and the 3rd end of pressurizer Q4 respectively, and the two ends of sample resistance R24 are connected with the 3rd end and first end of pressurizer Q4 respectively.
Control circuit also comprises resistance R 12, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 25, sampling R27, sampling R28, sampling R29 and the 4th capacitor C 10.
Resistance R 17 is in parallel with first capacitor C 8 with the series circuit that R18 forms.Resistance R 19 is in parallel with second capacitor C 7 with the series circuit that R20 forms, and connects with the series circuit that R18 forms with resistance R 17.The series circuit that resistance R 12 and R25 form is with after the 3rd capacitor C 6 is connected, and is in parallel with the series circuit of first capacitor C 8 and second capacitor C, 7 compositions again.The 4th capacitor C 10 is in parallel with sample resistance R24, and after sample resistance R27, R28, R29 and the 4th capacitor C 10 composition series circuits, in parallel with the series circuit of first capacitor C 8 and second capacitor C, 7 compositions again.
The operation principle of control circuit is as follows among the utility model embodiment:
Pressurizer Q4 is accurate pressurizer TL432, be used for detecting the input voltage that AC-to DC translation circuit 101 is imported, when input voltage is higher than set point, pressurizer Q4 conducting, this moment, the grid voltage of switching tube Q3 was lower than 1.5V, therefore the drain electrode of switching tube Q3 is an off-state, thereby controls second capacitor C 7 and 8 tandem workings of first capacitor C; Otherwise when input voltage was lower than set point, pressurizer Q4 ended, and switching tube Q3 conducting with 7 short circuits of second capacitor C, has only the work of first capacitor C 8 thereby make, with double power requirement when satisfying low pressure of capacitance.
In the present embodiment, set point can not be the upper limit of low pressure and the lower limit of high pressure, therefore this predetermined value is set at 140V, has only 8 work of first capacitor C when being lower than 140V, and first capacitor C 8 and second capacitor C 7 are all worked when being higher than 140V.Further, the utility model causes vibration in order to prevent voltage near set point, increased negative feedback resistor R3, regulates the resistance of resistance R 3, can change the return difference of circuit upset.
In addition, switching tube Q3 is in conducting moment, because the ripple current of 100HZ is arranged in second capacitor C 7, so that the conducting electric current of switching tube Q3 need not selected is too big, selects 5A/500V MOSFET for use in the utility model embodiment.
The above-mentioned super wide input range Switching Power Supply that the utility model provides has been finished the voltage input of super wide range in the confined space, and the design of the Switching Power Supply of ultralow working temperature.When needing the Switching Power Supply of 20W output, the above-mentioned super wide input range Switching Power Supply of using the utility model to provide, can realize that input range is the alternating voltage of 65-460 volt, the working temperature of this moment is-25 ℃-60 ℃, and printed circuit board (PCB) is of a size of: 100*50mm; If existing design, then BUCK electric capacity must be connected with the electric capacity of 2 100UF/400V and could be satisfied the requirement of low-pressure low-temperature, and can't finish being arranged on the printed circuit board (PCB) of 100*50mm on because the electric capacity volume of 100UF/400V is too big this moment.
The super wide input range Switching Power Supply that the utility model embodiment provides can satisfy super wide input range and withstand voltage requirement, reduces shared volume and the electric capacity cost of electric capacity.
The above only is a preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (7)
1. a super wide input range Switching Power Supply comprises AC-to DC translation circuit, step-down conversion circuit, DC-to-DC reduction voltage circuit and pwm control circuit, it is characterized in that described step-down conversion circuit comprises:
First electric capacity is connected with described AC-to DC translation circuit;
Second electric capacity is with described first capacitances in series;
Control circuit is connected with described first electric capacity and second electric capacity, when AC-to DC translation circuit input high pressure, controls described first electric capacity and the second capacitances in series work, and when input low pressure, control has only the described first electric capacity work.
2. super wide input range Switching Power Supply as claimed in claim 1, it is characterized in that, described control circuit comprises switching tube Q3, pressurizer Q4 and resistance R 3, and wherein the drain electrode of switching tube Q3 and source electrode are connected with the two ends of second electric capacity respectively, and grid is connected with second end of pressurizer Q4; The 3rd end ground connection of pressurizer Q4, first end is connected with the drain electrode of switching tube Q3 by resistance R 3.
3. super wide input range Switching Power Supply as claimed in claim 2, it is characterized in that, described control circuit also comprises the 3rd capacitor C 6, resistance R 15 and sample resistance R24, the two ends of the 3rd capacitor C 6 and resistance R 15 are connected with second end and the 3rd end of pressurizer Q4 respectively, and the two ends of sample resistance R24 are connected with the 3rd end and first end of pressurizer Q4 respectively.
4. super wide input range Switching Power Supply as claimed in claim 3 is characterized in that described control circuit also comprises resistance R 17 and R18, and wherein said R17 is in parallel with described first electric capacity with the series circuit that R18 forms.
5. super wide input range Switching Power Supply as claimed in claim 4, it is characterized in that, described control circuit also comprises resistance R 19 and R20, and wherein resistance R 19 is in parallel with described second electric capacity with the series circuit that R20 forms, and connects with the series circuit that R18 forms with described resistance R 17.
6. super wide input range Switching Power Supply as claimed in claim 5, it is characterized in that, described control circuit also comprises resistance R 12 and R25, the series circuit that wherein said resistance R 12 and R25 form is with after described the 3rd capacitor C 6 is connected, and is in parallel with the series circuit of described first electric capacity and second electric capacity composition again.
7. super wide input range Switching Power Supply as claimed in claim 6, it is characterized in that, described control circuit also comprises sample resistance R27, R28, R29 and the 4th capacitor C 10, wherein the 4th capacitor C 10 is in parallel with sample resistance R24, and sample resistance R27, R28, R29 and the 4th capacitor C 10 are formed after the series circuit, and be in parallel with the series circuit of described first electric capacity and second electric capacity composition again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202619576U CN201639499U (en) | 2009-12-23 | 2009-12-23 | Switch power supply with ultra-wide input range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202619576U CN201639499U (en) | 2009-12-23 | 2009-12-23 | Switch power supply with ultra-wide input range |
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| Publication Number | Publication Date |
|---|---|
| CN201639499U true CN201639499U (en) | 2010-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202619576U Expired - Lifetime CN201639499U (en) | 2009-12-23 | 2009-12-23 | Switch power supply with ultra-wide input range |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013818B (en) * | 2009-12-23 | 2013-03-13 | 深圳市航嘉驰源电气股份有限公司 | Switch power supply with super-wide input range and method for reducing and translating alternating voltage |
-
2009
- 2009-12-23 CN CN2009202619576U patent/CN201639499U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013818B (en) * | 2009-12-23 | 2013-03-13 | 深圳市航嘉驰源电气股份有限公司 | Switch power supply with super-wide input range and method for reducing and translating alternating voltage |
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| DD01 | Delivery of document by public notice |
Addressee: Hu Haiguo Document name: Notification to Go Through Formalities of Registration |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101117 Effective date of abandoning: 20091223 |
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| RGAV | Abandon patent right to avoid regrant |