CN201127004Y - Switch power supply circuit and linear transformation circuit - Google Patents
Switch power supply circuit and linear transformation circuit Download PDFInfo
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- CN201127004Y CN201127004Y CNU2007201714413U CN200720171441U CN201127004Y CN 201127004 Y CN201127004 Y CN 201127004Y CN U2007201714413 U CNU2007201714413 U CN U2007201714413U CN 200720171441 U CN200720171441 U CN 200720171441U CN 201127004 Y CN201127004 Y CN 201127004Y
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Abstract
The utility model appropriate for the field of power supply circuit provides a switching power supply circuit and a linear transformation circuit. The switching power supply circuit comprises a transformer, a voltage steering circuit connected to a primary winding of the transformer, and a pulse width regulation controller controlled and communicated by the voltage steering circuit; the transformer comprises more than two primary windings; the circuit further comprises a switch performing unit switching between the primary windings of the transformer; a voltage detection circuit for triggering the switch performing unit to switch between the primary windings of the transformer according to variation of input voltage; and a power switch tube which is connected between the switch performing unit and zero potential and which is controlled and communicated by the pulse width regulation controller. The utility model increases quantity of the switching power supply circuit and the primary winding of the linear transformation circuit, detects size of input voltage, to control the switching the plurality of the primary winding, so as to regulate proportion of the lowest to the highest input voltages.
Description
Technical field
The utility model belongs to the power circuit field, relates in particular to a kind of switching power circuit and linear transforming circuit.
Background technology
The alternating current input voltage range of global general-use is 90V-264V at present, the ratio of minimum voltage and ceiling voltage is 1: 3 in the input voltage, it is that 100W is with interior inverse-excitation type or positive activation type Switching Power Supply that the power supply that can realize this general input range is common in power, as shown in Figure 1, the Switching Power Supply of this inverse-excitation type or positive activation type adopts pulse width modulation (Pulse Width Modulation now mostly, PWM) frequency is transferred wide mode, promptly realize the adjusting of output voltage V out by the conduction ratio that changes weekly phase internal power pipe, the former limit of input voltage vin and transformer winding inductance value Lp, the electric current I p of the former limit of transformer winding inductance, the frequency f of power tube switch and conduction ratio D are relevant, be specially Vin=Lp * Ip * f/D, if minimum and maximum conduction ratio is used Dmin respectively, Dmax represents, input voltage changes from Vin-min to Vin-max, Dmin=Dmax/ ((1-Dmax) K+Dmax) then, K=Vin-max/Vin-min wherein, in the actual design, consider grid voltage change and load variations, fully loaded and the Vout rise in the low pressure input, under the situation of high pressure input zero load and Vout downward modulation, general D gets 0.2-0.45, then can get K ≈ 3 by following formula.
This power circuit is owing to be subjected to the restriction of conduction ratio D, can only realize the adjustable range of ratio about 1: 3 of minimum voltage and ceiling voltage in the input voltage, but need use the relative broad range input voltage at some, power tens on the occasion of hectowatt, then can not satisfy the demand.
The utility model content
The purpose of this utility model is to provide a kind of switching power circuit, is intended to solve the problem that existing switching power circuit can not satisfy the relative broad range input voltage.
The utility model is to realize like this, a kind of switching power circuit comprises a transformer, the voltage steering circuit that is connected with the former limit of described transformer winding, with Pwm controller by described voltage steering circuit control conducting, described transformer comprise plural former limit winding; Described circuit also comprises:
The switch performance element that between the winding of the former limit of described transformer, switches;
The voltage detecting circuit that between the winding of the former limit of described transformer, switches according to the described switch performance element of the change triggers of input voltage; And
By the power switch pipe of described Pwm controller control conducting, described power switch pipe is connected between described switch performance element and the zero potential.
Another purpose of the present utility model is to provide a kind of linear transforming circuit, comprises a transformer, described transformer comprise plural former limit winding; Described linear transformer also comprises:
The switch performance element that between the winding of the former limit of described transformer, switches; And
The voltage detecting circuit that between the winding of the former limit of described transformer, switches according to the described switch performance element of the change triggers of input voltage.
The utility model embodiment is by the quantity of the former limit winding of increase switching power circuit and linear transforming circuit, detect the size of input voltage, and regulate the ratio of minimum input voltage and maximum input voltage to be controlled at the mode of switching between the winding of a plurality of former limits, need can be applied to the occasion of relative broad range input voltage.
Description of drawings
Fig. 1 is that the power that prior art provides is the circuit diagram of 100W with interior inverse-excitation type switch power-supply;
Fig. 2 is the circuit structure schematic diagram of the Switching Power Supply that provides of the utility model first embodiment;
Fig. 3 is the schematic diagram of the voltage steering circuit among Fig. 2;
Fig. 4 is the improvement schematic diagram of the switching power circuit that provides of the utility model first embodiment;
Fig. 5 is the circuit structure schematic diagram of the linear transforming circuit that provides of the utility model second embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model, the quantity of the former limit winding by increasing transformer, detect the size of input voltage, and regulate the ratio of minimum input voltage and maximum input voltage to be controlled at the mode of switching between the winding of a plurality of former limits, meet the needs of relative broad range input voltage and power tens on the occasion of hectowatt.
Fig. 2 shows the circuit structure principle of the Switching Power Supply that the utility model first embodiment provides, wherein, transformer T comprises the former limit winding of two series connection, the first former limit winding NP1 is connected with power switch pipe Q1 by switch performance element K with the second former limit winding NP2, the collector electrode of power switch pipe Q1 or leakage level are connected with switch performance element K, the emitter of power switch pipe Q1 or source class connecting to neutral current potential, base stage or grid level are connected with the output of PWM controller, the power end of PWM controller is connected with the output Vcc of the auxiliary winding of transformer T, power end is connected with former limit winding electric by a voltage steering circuit simultaneously, this voltage steering circuit is connected to series connection place of the first former limit winding NP1 and the second former limit winding NP2, also can be connected with input Vin when specifically implementing.Input Vin also is connected with a voltage detecting circuit, this voltage detecting circuit is connected with switch performance element K, control switch performance element K is implemented in the switching between the first former limit winding NP1 and the second former limit winding NP2, and the power end of switch performance element K is connected by a pressurizer with the output Vcc of the auxiliary winding of transformer T.
When input Vin has input voltage signal, the voltage steering circuit triggers the PWM controller according to input voltage signal and sends pwm signal, this pwm signal makes power switch pipe Q1 conducting, form path between input Vin, the former limit of transformer T winding, switch performance element K, power switch pipe Q1 and the zero potential, transformer T starts working, the output Vcc of auxiliary winding has voltage output, power end and pressurizer power supply to the PWM controller, auxiliary winding NS1 output end vo ut has voltage output equally, at this moment, the voltage steering circuit is instead ended partially; Voltage detecting circuit detects the variation of input voltage vin simultaneously, switch between the first former limit winding NP1 and the second former limit winding NP2 according to detection triggers switch performance element K, according to Vin=Lp * Ip * f/D, input voltage vin is relevant with the inductance size of the former limit of transformer winding, when input voltage vin is low, voltage detecting circuit trigger switch performance element K switches the first former limit winding NP1 by power switch pipe Q1 connecting to neutral current potential, be equivalent to have only the first former limit winding NP1 effective, can realize minimum input voltage and maximum input voltage 1: 3 during this period; When voltage detecting circuit detects input voltage vin and reaches 3 times of minimum input voltage, control switch performance element K switches the second former limit winding NP2 by power switch pipe Q1 connecting to neutral current potential, because the first former limit winding NP1 connects with the second former limit winding NP2, be equivalent to the first former limit winding NP1 and the second former limit winding NP2 is all effective, each parameter value such as inductance of the former limit winding of whole transformer T is the first former limit winding NP1 and the second former limit winding NP2 parameter value sum, can realize minimum input voltage and maximum input voltage 1: 3 during this period, and the minimum input voltage in during this is and is having only first maximum input voltage of former limit in the winding NP1 valid period, therefore transformer T in each work period minimum input voltage and maximum input voltage be 1: 9, for example can make input voltage range is 30-270VAC.
Be the former limit winding of giving tacit consent to before the circuit start with the first former limit winding NP1 in the circuit shown in Figure 2, power switch pipe Q1 crosses big peak current at the startup transient flow when high pressure is imported in order to avoid, between the first former limit winding NP1 and switch performance element K, increase a current-limiting resistance Rt, efficient when considering the low pressure input again, recommend to use negative temperature coefficient heat-sensitive (Negative Temperature Coefficient Thermistor, NTC) resistance.Also can be the acquiescence winding according to the former limit winding that actual conditions are provided with other during specific implementation, this moment, the connected mode of current-limiting resistance Rt was done adaptive change, repeated no more.
Switch performance element K among Fig. 2 can be a mechanical relay, it also can be contactless and so on switching device, as thyristor, solid-state relay etc., mechanical relay is because there is the existence of operate time, when change action, can there be the drop time with the moment of relay actuation time in output voltage, can use in some less demanding occasion, but recommend to use noncontacting switch devices such as thyristor, solid-state relay in the requirements at the higher level occasion.
Fig. 3 shows the schematic diagram of the voltage steering circuit among Fig. 2, be voltage steering circuit part in the frame of broken lines wherein, series connection place of the first former limit winding NP1 and the second former limit winding NP2 is passed through resistance R 1 more successively through behind the divider resistance, R2, R3 connecting to neutral current potential, resistance R 2, R3 series connection back is simultaneously in parallel with an electric capacity and a three terminal regulator, and the reference edge of this three terminal regulator and resistance R 2, R3 series connection place connects, anode connecting to neutral current potential, negative electrode connecting resistance R1, series connection place of R2, the negative electrode of this three terminal regulator also links to each other with the base stage of power switch pipe Q by diode D, the negative electrode of diode D links to each other with the base stage of power switch pipe Q, and the anode of diode D links to each other with the negative electrode of three terminal regulator.The collector electrode of power switch pipe Q is connected by series connection place of resistance with the first former limit winding NP1 and the second former limit winding NP2, and emitter is connected by the power end of resistance with the PWM controller.Operation principle is: after input voltage vin process resistance R 1, R2, the R3 dividing potential drop, by three terminal regulator power controlling switching tube Q conducting, input voltage vin is the power supply of PWM controller by power switch pipe Q, the PWM controller sends pwm signal, this pwm signal makes power switch pipe Q1 conducting, and then transformer T starts working, and Vcc voltage output back voltage steering circuit is then instead ended partially.
Because power circuit will be taken into account the high-low pressure input, the requirement of high pressure input is preferentially satisfied in the selection of power switch pipe Q1, limited more powerful conversion to such an extent as to the conducting internal resistance of power switch pipe Q1 is bigger, therefore, as improvement to the utility model first embodiment, can adopt two device for power switching to switch the first former limit winding NP1 and the second former limit winding NP2, specifically referring to Fig. 4, when voltage steering circuit (not shown among Fig. 4) triggers the work of PWM controller, logic gates is according to the testing result of voltage detecting circuit, the pwm signal that the PWM controller is sent exports the first power switch pipe Q2 or the second power switch pipe Q3 to, the conducting internal resistance of the first power switch pipe Q2 is less, and the conducting internal resistance of the second power switch pipe Q3 is bigger; The base stage of the first power switch pipe Q2 and the second power switch pipe Q3 all is connected with logic gates, by described logic gates Selective Control Q2 or Q3 alternate conduction, the collector electrode of the second power switch pipe Q3 is connected to series connection place of the second former limit winding NP1 and the second former limit winding NP2, the collector electrode of the first power switch pipe Q2 then is connected with the second former limit winding NP2, when the second power switch pipe Q3 conducting, be equivalent to the first former limit winding NP1 by the first power switch pipe Q2 connecting to neutral current potential, have only the first former limit winding NP1 effective; When the first power switch pipe Q2 conducting, be equivalent to the first former limit winding NP1 and the second former limit winding NP2 series connection back connecting to neutral current potential, the first former limit winding NP1 and the second former limit winding NP2 are all effective, thereby by the switching between the first power switch pipe Q2 and the second power switch pipe Q3 realized transformer T in each work period minimum input voltage and maximum input voltage be 1: 9, and the power tube conducting internal resistance when the power tube conducting internal resistance during the high pressure input is imported less than low pressure has realized more powerful conversion.
Fig. 5 shows the circuit structure principle of the linear transforming circuit that the utility model second embodiment provides, this circuit detects the change triggers power switch pipe Q4 conducting of input voltage by voltage detecting circuit, and then switch performance element K is switched between the first former limit winding NP1 and the second former limit winding NP2, realize the minimum input voltage and maximum input voltage ratio of relative broad range, the output voltage V out of the auxiliary winding of transformer T changes with the variation of input voltage.The power end of switch performance element K is connected with the output Vcc of the auxiliary winding of transformer T by a pressurizer, and remainder is identical with voltage of voltage regulation circuit among Fig. 2, Fig. 3, Fig. 4, repeats no more.
Below only be described with regard to the switching power circuit and the linear transforming circuit of two former limit windings, be to be understood that, can also realize the minimum input voltage and maximum input voltage ratio of wide region by the quantity and the device for power switching that increase former limit winding, principle is the same, specifically repeats no more.Fig. 2 and circuit shown in Figure 3 only change the former limit of transformer winding quantity and switching device, and concrete circuit structure can be structures such as inverse-excitation type, positive activation type or half-bridge.
The quantity of the utility model embodiment by increasing the former limit of switching power circuit winding and the quantity of the former limit winding of linear transforming circuit, detect the size of input voltage, and regulate the ratio of minimum input voltage and maximum input voltage to be controlled at the mode of switching between the winding of a plurality of former limits, can the satisfy the demand occasion of relative broad range input voltage, and the power tube conducting internal resistance of the power tube conducting internal resistance that is arranged on high pressure when input when importing less than low pressure, realized more powerful conversion.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (9)
1, a kind of switching power circuit, comprise a transformer, the voltage steering circuit that is connected with the former limit of described transformer winding and by the Pwm controller of described voltage steering circuit control conducting, it is characterized in that, described transformer comprise plural former limit winding; Described circuit also comprises:
The switch performance element that between the winding of the former limit of described transformer, switches;
The voltage detecting circuit that between the winding of the former limit of described transformer, switches according to the described switch performance element of the change triggers of input voltage; And
By the power switch pipe of described Pwm controller control conducting, described power switch pipe is connected between described switch performance element and the zero potential.
2, switching power circuit as claimed in claim 1 is characterized in that, described circuit further comprises:
Be connected the auxiliary winding voltage output of described transformer and the pressurizer between the described switch performance element power end.
3, switching power circuit as claimed in claim 1 or 2 is characterized in that, described switch performance element is a mechanical relay.
4, switching power circuit as claimed in claim 1 or 2 is characterized in that, described switch performance element is thyristor or solid-state relay.
5, switching power circuit as claimed in claim 1 or 2 is characterized in that, described switch performance element comprises a plurality of power switch pipes; Described switching power circuit further comprises:
One controls the logic gates of a plurality of power switch pipe alternate conduction in the described switch performance element according to the variation of input voltage.
6, a kind of linear transforming circuit comprises a transformer, it is characterized in that, described transformer comprise plural former limit winding; Described linear transformer also comprises:
The switch performance element that between the winding of the former limit of described transformer, switches; And
The voltage detecting circuit that between the winding of the former limit of described transformer, switches according to the described switch performance element of the change triggers of input voltage.
7, the described linear transforming circuit of claim 6 is characterized in that, described linear transforming circuit further comprises:
Be connected the voltage output end of auxiliary winding of described transformer and the pressurizer between the described switch performance element power end.
8, claim 6 or 7 described linear transforming circuits is characterized in that described switch performance element is a mechanical relay.
9, claim 6 or 7 described linear transforming circuits is characterized in that described switch performance element is thyristor or solid-state relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201714413U CN201127004Y (en) | 2007-12-07 | 2007-12-07 | Switch power supply circuit and linear transformation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201714413U CN201127004Y (en) | 2007-12-07 | 2007-12-07 | Switch power supply circuit and linear transformation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201127004Y true CN201127004Y (en) | 2008-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201714413U Expired - Fee Related CN201127004Y (en) | 2007-12-07 | 2007-12-07 | Switch power supply circuit and linear transformation circuit |
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| CN (1) | CN201127004Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570573A (en) * | 2011-12-31 | 2012-07-11 | 成都市华为赛门铁克科技有限公司 | Power supply method and system as well as power supply |
| WO2012155325A1 (en) * | 2011-05-16 | 2012-11-22 | Intersil Americas Inc. | Dc/dc power converter with wide input voltage range |
| CN107231090A (en) * | 2016-03-23 | 2017-10-03 | 施耐德电气工业公司 | Switch mode power |
| WO2018077910A1 (en) * | 2016-10-26 | 2018-05-03 | Abb Schweiz Ag | A switched-mode power supply with power factor correction |
-
2007
- 2007-12-07 CN CNU2007201714413U patent/CN201127004Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012155325A1 (en) * | 2011-05-16 | 2012-11-22 | Intersil Americas Inc. | Dc/dc power converter with wide input voltage range |
| CN102570573A (en) * | 2011-12-31 | 2012-07-11 | 成都市华为赛门铁克科技有限公司 | Power supply method and system as well as power supply |
| CN107231090A (en) * | 2016-03-23 | 2017-10-03 | 施耐德电气工业公司 | Switch mode power |
| WO2018077910A1 (en) * | 2016-10-26 | 2018-05-03 | Abb Schweiz Ag | A switched-mode power supply with power factor correction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20081001 Termination date: 20151207 |
|
| EXPY | Termination of patent right or utility model |