CN202004673U - Step-down power circuit architecture - Google Patents
Step-down power circuit architecture Download PDFInfo
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- CN202004673U CN202004673U CN2011200440291U CN201120044029U CN202004673U CN 202004673 U CN202004673 U CN 202004673U CN 2011200440291 U CN2011200440291 U CN 2011200440291U CN 201120044029 U CN201120044029 U CN 201120044029U CN 202004673 U CN202004673 U CN 202004673U
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Abstract
The utility model discloses a step-down power circuit architecture, which is suitable for supplying power to an external load device such as an induction cooker. The step-down power circuit architecture comprises an input rectification filtering unit, a control chip, a step-down switch unit, an output filtering voltage stabilization unit and a feedback sampling power supply unit, wherein the input rectification filtering unit converts externally input AC input power into a first signal; the control chip is connected with the first signal and a fourth signal, and generates a second signal; the step-down switch unit is connected with the second signal, and generates a first step-down output signal and the third signal; the output filtering voltage stabilization unit is connected with and regulates the first step-down output signal and the third signal, and generates a second step-down output signal; the first and second step-down output signals are connected with the external load device; the feedback sampling power supply unit receives the first step-down output signal, and generates the fourth signal; the first signal is connected with the fourth signal by a starting resistor; and the control chip is provided with a power end, a drain end, a grounding end, a compensation end and a current sensing end.
Description
Technical field
The utility model relates to a kind of voltage-dropping power supply circuit framework, relates in particular to a kind of voltage-dropping power supply circuit structure that the electromagnetic oven power source design of tool high efficiency, low standby power loss, low-cost characteristic can be provided.
Background technology
Along with the mankind consume natural resources excessively, make living environment by heavy damage, face the pressure of energy deficiency simultaneously, thereby the demand of energy-saving and emission-reduction is extremely urgent, especially for electric equipment and electronic product, must be optimized its power supply changeover device,, realize higher conversion efficiency and lower static stand-by power consumption to reduce energy resource consumption.
Generally, present electromagnetic oven power supply plan generally adopts the anti-sharp structure of simplicity of design, but the shortcoming of inverse-excitation type switch power-supply is that conversion efficiency is not high, stand-by power consumption is too big on the market, and it is bigger instead to swash number of parts sizes numerous, transformer required in the power-supply system, thereby cause system cost and production cost to remain high, can't satisfy various new standard of energy and safety standard more.Therefore, need a kind of new-type voltage-dropping power supply circuit framework, utilize control chip to carry out accurate switch control,, and solve the above problems as electromagnetic oven to provide stable out-put supply to the external electrical device.
The utility model content
Main purpose of the present utility model is to provide a kind of voltage-dropping power supply circuit framework, is used for providing the electromagnetic oven power source design of tool high efficiency, low standby power loss, low-cost characteristic.
In order to achieve the above object, the voltage-dropping power supply circuit framework that the utility model provides comprises input rectifying filter unit, step-down switching unit, output filtering voltage regulation unit, feedback sample power supply unit and control chip, input rectifying filter unit wherein converts the alternating current input power supplying of outside input to first signal; Control chip connects first signal and the 4th signal, and produces secondary signal; The step-down switching unit connects secondary signal and produces the first step-down output signal and the 3rd signal; Output filtering voltage regulation unit connects and regulates the first step-down output signal and the 3rd signal, and produces the second step-down output signal, and this second step-down signal and the first step-down signal connect the external loading device; The feedback sample power supply unit receives the first step-down output signal and produce the 4th signal, and first signal connects the 4th signal through starting resistance; Control chip has power end, drain electrode end, earth terminal, compensation end and current sense end, and this power end connects the 4th signal, this drain electrode end connects first signal, this earth terminal connects secondary signal, this compensation end connects secondary signal through building-out capacitor, and this current sense end connects secondary signal through current sensing resistor.
In above-mentioned voltage-dropping power supply circuit framework, described input rectifying filter unit comprises a fuse, one piezo-resistance, one common mode filter inductance, one prime electric capacity, one back grade electric capacity, one rectifier bridge and an input filter capacitor, one end of this fuse connects this first interchange end, the other end of this fuse connects an end of this piezo-resistance, the other end of this piezo-resistance connects this second interchange end, and this fuse is connected in series with this piezo-resistance, and a string contact of this this fuse and this piezo-resistance this prime electric capacity that is connected in parallel, one side of this common mode filtering inductance connects this prime electric capacity, and the opposite side of this common mode filtering inductance connects this back level electric capacity, this rectifier bridge comprises one first diode, one second diode, one the 3rd diode and one the 4th diode, one negative pole of this first diode connects a positive pole of this second diode, one negative pole of the 3rd diode connects a positive pole of the 4th diode, an and negative pole of this first diode and a negative pole of the 3rd diode this back level electric capacity that is connected in parallel, and a positive pole anodal and the 3rd diode of this first diode connects this system earth, and the negative pole of the negative pole of this second diode and the 4th diode connects this first signal, anodal this first signal of connection of this input filter capacitor, and a negative pole connected system ground connection of this input filter capacitor.
In above-mentioned voltage-dropping power supply circuit framework, described step-down switching unit comprises a fly-wheel diode and a transformer, anodal this system earth of connection of this fly-wheel diode, one negative pole of this fly-wheel diode connects this secondary signal, this transformer has one first side and one second side, and first this secondary signal of side cross-over connection of this transformer and this first step-down output signal, second this system earth of side cross-over connection and the 3rd signal of this transformer.
In above-mentioned voltage-dropping power supply circuit framework, the steady unit of described output filtering comprises a rectifier diode, one linear voltage regulator, one first output filter capacitor, one second output filter capacitor, one the 3rd output filter capacitor, one first dummy load, one second dummy load and one the 3rd dummy load, one anodal the 3rd signal that connects of this rectifier diode, one end of this first dummy load connects this first step-down output signal, this second dummy load and this first output filter capacitor this first step-down output signal of cross-over connection in parallel and this system earth, the other end of this first dummy load connects a positive pole of this second output filter capacitor, one negative pole of this rectifier diode and an input of this linear voltage regulator, one negative pole of this second output filter capacitor connects this system earth, one output of this linear voltage regulator connects this second step-down output signal, and an earth terminal of this linear voltage regulator connects this system earth, the 3rd dummy load and the 3rd output filter capacitor this second step-down output signal of cross-over connection in parallel and this system earth.
In above-mentioned voltage-dropping power supply circuit framework, described feedback sample power supply unit comprises feedback rectifier diode, a feedback filtering electric capacity and a starting resistance, anodal this first step-down output signal that connects of this feedback rectifier diode, one negative pole of this feedback rectifier diode connects the 4th signal, one anodal the 4th signal that connects of this feedback filtering electric capacity, and a negative pole of this feedback filtering electric capacity connects this secondary signal, one end of this starting resistance connects the 4th signal, and the other end of this starting resistance connects this first signal.
In above-mentioned voltage-dropping power supply circuit framework, described control chip is an OB2226 chip, and this OB2226 chip is a pwm power switch chip, the drain electrode end of this OB2226 chip is the drain electrode of an internal power MOSFET, the power end of this OB2226 chip and current sense end be through after the internal arithmetic of this OB2226 chip to regulate the ON time of this inside MOSFET, it is stable to use control output voltage.
Therefore, the beneficial effect of voltage-dropping power supply circuit framework of the present utility model is to overcome present technical bottleneck, and the power source design of tool high efficiency, low standby power loss, low-cost characteristic is provided, and especially is fit to power supply to the external loading device as electromagnetic oven.
Description of drawings
Fig. 1 is the schematic diagram of voltage-dropping power supply circuit framework among the utility model embodiment;
Fig. 2 is the schematic diagram of input rectifying filter unit among the utility model embodiment;
Fig. 3 is the schematic diagram of step-down switching unit among the utility model embodiment;
Fig. 4 is the schematic diagram of output filtering voltage regulation unit among the utility model embodiment; And
Fig. 5 is the schematic diagram of feedback sample power supply unit among the utility model embodiment.
Embodiment
Those of ordinary skill in the art below will do more detailed description in the mode of exemplary enforcement, so that can implement according to this after studying this specification carefully to the utility model.
With reference to figure 1, Fig. 1 is the schematic diagram of the utility model voltage-dropping power supply circuit framework.As shown in Figure 1, voltage-dropping power supply circuit framework 1 of the present utility model comprises input rectifying filter unit 10, control chip 20, step-down switching unit 30, output filtering voltage regulation unit 40 and feedback sample power supply unit 50, is used for converting the alternating current input power supplying VAC of outside input to the first stable step-down output signal VO1 and the second step-down output signal VO2.
Alternating current input power supplying VAC has first and exchanges the end VAC+ and the second interchange end VAC-.
Input rectifying filter unit 10 converts alternating current input power supplying VAC to first signal V1, control chip 20 connects the first signal V1 and produces secondary signal V2, step-down switching unit 30 connects secondary signal V2 and produces the first step-down output signal VO1 and the 3rd signal V3,40 connections of output filtering voltage regulation unit are also regulated the first step-down output signal VO1 and the 3rd signal V3, and produce the second step-down output signal VO2, feedback sample power supply unit 50 receives the first step-down output signal VO1 and produces the 4th signal V4, and this first signal V1 connects the 4th signal V4 through starting resistance RD.
Therefore, the utility model the first step-down output signal VO1 and the second step-down output signal VO2 can be connected and power supply to external loading device (not shown), such as electromagnetic oven, use and reach high efficiency, low standby power loss, purpose cheaply.
With reference to figure 2, Fig. 2 is the schematic diagram of the utility model input rectifying filter unit.Input rectifying filter unit 10 comprises fuse FUSE, piezo-resistance MOV, common mode filtering inductance L 1, prime capacitor C X1, back level capacitor C X2, rectifier bridge BD1 and input filter capacitor C1, wherein the end of fuse FUSE connects the first interchange end VAC+, the other end of fuse FUSE connects the end of piezo-resistance MOV, the other end of piezo-resistance MOV connects second and exchanges end VAC-, and fuse FUSE is connected in series with piezo-resistance MOV, and fuse FUSE and piezo-resistance MOV are connected in series the some prime capacitor C X1 that is connected in parallel, one side of common mode filtering inductance L 1 connects prime capacitor C X1, and the opposite side of common mode filtering inductance L 1 connects back level capacitor C X2.
Rectifier bridge BD1 comprises the first diode DB1, the second diode DB2, the 3rd diode DB3 and the 4th diode DB4, wherein the negative pole of the first diode DB1 connects the positive pole of the second diode DB2, the negative pole of the 3rd diode DB3 connects the positive pole of the 4th diode DB4, and level capacitor C X2 after the negative pole of the negative pole of the first diode DB1 and the 3rd diode DB3 is connected in parallel, and the anodal connected system ground connection of anodal and the 3rd diode DB3 of the first diode DB1, the negative pole of the negative pole of the second diode DB2 and the 4th diode DB4 is exported first signal, input filter capacitor C1 cross-over connection first signal V1 and the system earth.
With reference to figure 3, Fig. 3 is the schematic diagram of the utility model step-down switching unit.As shown in Figure 3, step-down switching unit 30 comprises sustained diode 2 and transformer T1, the anodal connected system ground connection of sustained diode 2 wherein, the negative pole of sustained diode 2 connects secondary signal V2, and transformer T1 has first side and second side, and the first side cross-over connection secondary signal V2 and the first step-down output signal of transformer T1, and second side of transformer T1 has first end and second end, the first end connected system ground connection of second side, second end of second side connects the 3rd signal V3.
With reference to figure 4, Fig. 4 is the schematic diagram of the utility model output filtering voltage regulation unit.As shown in Figure 4, the steady unit 40 of output filtering comprises rectifier diode D3, linear voltage regulator 78L05, the first output filter capacitor C4, the second output filter capacitor C5, the 3rd output filter capacitor C6, the first dummy load R4, the second dummy load R5 and the 3rd dummy load R6.
The positive pole of rectifier diode D3 connects the 3rd signal V3, the end of the first dummy load R4 connects the first step-down output signal VO1, the second dummy load R5 and first output filter capacitor C4 cross-over connection first step-down output signal VO1 and the system earth in parallel, the other end of the first dummy load R4 connects the end of the second output filter capacitor C5, the input of the negative pole of rectifier diode D3 and linear voltage regulator 78L05, the earth terminal connected system ground connection of the other end of the second output filter capacitor C5 and linear voltage regulator 78L05, the output of linear voltage regulator 78L05 connects the second step-down output signal VO2, the 3rd dummy load R6 and the 3rd output filter capacitor C6 cross-over connection second step-down output signal VO2 and the system earth in parallel.
Usually, the first step-down output signal VO1 can be+18V, and the second step-down output signal VO2 can be+5V, and linear voltage regulator 78L05 has+the 5V voltage stabilizing function.
Step-down switching unit 30 can further comprise π type filter circuit or common mode filtering circuit, to improve filter effect at different output ripple requirements.
With reference to figure 5, Fig. 5 is the schematic diagram of the utility model feedback sample power supply unit.As shown in Figure 5, feedback sample power supply unit 50 comprises feedback rectifier diode D1 and feedback filtering capacitor C 3, the positive pole that wherein feeds back rectifier diode D1 connects the first step-down output signal VO1, the negative pole of feedback rectifier diode D1 connects the 4th signal V4, the positive terminal of feedback filtering capacitor C 3 connects the 4th signal V4, and the negative pole end of feedback filtering capacitor C 3 connects secondary signal V2.
Above-mentioned control chip 20 can utilize commercial OB2226 chip and realize, the OB2226 chip is the pwm power switch chip, wherein drain electrode end DRAIN is the drain electrode of internal power MOSFET, after power end VDD and current sense end CS the internal arithmetic through the OB2226 chip, the ON time of the inner MOSFET of scalable, it is stable to use control output voltage.
Skilled personnel under defined the utility model scope, will expect the modifications and changes according to the embodiment of shown and explanation in not departing from as appended claims.
Claims (6)
1. a voltage-dropping power supply circuit framework is characterized in that, this voltage-dropping power supply circuit framework comprises:
One input rectifying filter unit, the alternating current input power supplying that the outside is imported converts one first signal to, and this input rectifying filter unit has one first and exchanges end and one second interchange end;
One step-down switching unit connects a secondary signal, and produces one first step-down output signal and one the 3rd signal;
One output filtering voltage regulation unit connects and regulates the 3rd signal, and produces one second step-down output signal, and this first step-down output signal and this second step-down output signal are to be used for power supply to give an external loading device;
One feedback sample power supply unit receives this first step-down output signal, and produces one the 4th signal, and this first signal connects the 4th signal through a starting resistance;
One control chip, have a power end, a drain electrode end, an earth terminal, a compensation end and a current sense end, and this power end connects the 4th signal, this drain electrode end connects this first signal, this earth terminal connects this secondary signal, this compensation end connects this secondary signal through a building-out capacitor, and this current sense end connects this secondary signal through a current sensing resistor.
2. voltage-dropping power supply circuit framework according to claim 1 is characterized in that,
Described input rectifying filter unit comprises a fuse, one piezo-resistance, one common mode filter inductance, one prime electric capacity, one back grade electric capacity, one rectifier bridge and an input filter capacitor, one end of this fuse connects this first interchange end, the other end of this fuse connects an end of this piezo-resistance, the other end of this piezo-resistance connects this second interchange end, and this fuse is connected in series with this piezo-resistance, and a string contact of this fuse and this piezo-resistance this prime electric capacity that is connected in parallel, one side of this common mode filtering inductance connects this prime electric capacity, and the opposite side of this common mode filtering inductance connects this back level electric capacity, this rectifier bridge comprises one first diode, one second diode, one the 3rd diode and one the 4th diode, one negative pole of this first diode connects a positive pole of this second diode, one negative pole of the 3rd diode connects a positive pole of the 4th diode, an and negative pole of this first diode and a negative pole of the 3rd diode this back level electric capacity that is connected in parallel, and a positive pole anodal and the 3rd diode of this first diode connects this system earth, and the negative pole of the negative pole of this second diode and the 4th diode connects this first signal, anodal this first signal of connection of this input filter capacitor, and a negative pole connected system ground connection of this input filter capacitor.
3. voltage-dropping power supply circuit framework according to claim 1 is characterized in that,
Described step-down switching unit comprises a fly-wheel diode and a transformer, anodal this system earth of connection of this fly-wheel diode, one negative pole of this fly-wheel diode connects this secondary signal, this transformer has one first side and one second side, and first this secondary signal of side cross-over connection of this transformer and this first step-down output signal, second this system earth of side cross-over connection and the 3rd signal of this transformer.
4. voltage-dropping power supply circuit framework according to claim 1 is characterized in that,
The steady unit of described output filtering comprises a rectifier diode, one linear voltage regulator, one first output filter capacitor, one second output filter capacitor, one the 3rd output filter capacitor, one first dummy load, one second dummy load and one the 3rd dummy load, one anodal the 3rd signal that connects of this rectifier diode, one end of this first dummy load connects this first step-down output signal, this second dummy load and this first output filter capacitor this first step-down output signal of cross-over connection in parallel and this system earth, the other end of this first dummy load connects a positive pole of this second output filter capacitor, one negative pole of this rectifier diode and an input of this linear voltage regulator, one negative pole of this second output filter capacitor connects this system earth, one output of this linear voltage regulator connects this second step-down output signal, and an earth terminal of this linear voltage regulator connects this system earth, the 3rd dummy load and the 3rd output filter capacitor this second step-down output signal of cross-over connection in parallel and this system earth.
5. voltage-dropping power supply circuit framework according to claim 1 is characterized in that,
Described feedback sample power supply unit comprises feedback rectifier diode, a feedback filtering electric capacity and a starting resistance, anodal this first step-down output signal that connects of this feedback rectifier diode, one negative pole of this feedback rectifier diode connects the 4th signal, one anodal the 4th signal that connects of this feedback filtering electric capacity, and a negative pole of this feedback filtering electric capacity connects this secondary signal, one end of this starting resistance connects the 4th signal, and the other end of this starting resistance connects this first signal.
6. voltage-dropping power supply circuit framework according to claim 1 is characterized in that,
Described control chip is an OB2226 chip, and this OB2226 chip is a pwm power switch chip, the drain electrode end of this OB2226 chip is the drain electrode of an internal power MOSFET, the power end of this OB2226 chip and current sense end be through after the internal arithmetic of this OB2226 chip to regulate the ON time of this inside MOSFET, it is stable to use control output voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200440291U CN202004673U (en) | 2011-02-17 | 2011-02-17 | Step-down power circuit architecture |
| TW100206242U TWM413100U (en) | 2011-02-17 | 2011-04-08 | Architecture of voltage-reduction electric power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200440291U CN202004673U (en) | 2011-02-17 | 2011-02-17 | Step-down power circuit architecture |
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| Publication Number | Publication Date |
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| CN202004673U true CN202004673U (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200440291U Expired - Lifetime CN202004673U (en) | 2011-02-17 | 2011-02-17 | Step-down power circuit architecture |
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| Country | Link |
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| CN (1) | CN202004673U (en) |
| TW (1) | TWM413100U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207347A (en) * | 2015-09-11 | 2015-12-30 | 珠海格力电器股份有限公司 | Multi-output power supply with uninterrupted power supply |
| CN106992698A (en) * | 2017-05-04 | 2017-07-28 | 厦门其力电子科技有限公司 | A kind of module for power supply circuit with double-mode |
-
2011
- 2011-02-17 CN CN2011200440291U patent/CN202004673U/en not_active Expired - Lifetime
- 2011-04-08 TW TW100206242U patent/TWM413100U/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207347A (en) * | 2015-09-11 | 2015-12-30 | 珠海格力电器股份有限公司 | Multi-output power supply with uninterrupted power supply |
| CN106992698A (en) * | 2017-05-04 | 2017-07-28 | 厦门其力电子科技有限公司 | A kind of module for power supply circuit with double-mode |
| CN106992698B (en) * | 2017-05-04 | 2023-06-06 | 厦门其力电子科技有限公司 | Module power supply circuit with dual mode |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM413100U (en) | 2011-10-01 |
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Granted publication date: 20111005 |