CN114285288A - Voltage-stabilizing power supply module and wide-output-voltage-range circuit - Google Patents
Voltage-stabilizing power supply module and wide-output-voltage-range circuit Download PDFInfo
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- CN114285288A CN114285288A CN202111502576.4A CN202111502576A CN114285288A CN 114285288 A CN114285288 A CN 114285288A CN 202111502576 A CN202111502576 A CN 202111502576A CN 114285288 A CN114285288 A CN 114285288A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a wide output voltage range circuit which comprises a first capacitor, a first switch, a second capacitor, a third switch, a fourth switch, a third capacitor and a transformer, wherein the third switch and the fourth switch are connected in series, a primary winding of the transformer is connected in series with the third capacitor and then connected in parallel with the third switch or the fourth switch, a secondary winding of the transformer is connected in parallel with a load, the second switch is connected in series with the second capacitor and then connected in parallel with the first switch, and two ends of a series branch of the first capacitor and the first switch are connected in parallel with an auxiliary winding of the transformer. The output voltage of the secondary winding changes in a wide range, and the voltage of the auxiliary winding passing through the voltage stabilizing power supply module is related to the input voltage and the turn ratio of the auxiliary winding to the primary winding and is unrelated to the output voltage. When the output voltage is changed, the output voltage of the auxiliary winding is unchanged, and stable auxiliary voltage can be provided.
Description
Technical Field
The invention belongs to the technical field of electric energy conversion, and particularly relates to a wide output voltage range circuit.
Background
The power supply of the auxiliary circuit of the asymmetric half-bridge flyback circuit is generally realized by adding an auxiliary winding in a transformer of a main circuit, and the auxiliary voltage Vcc rectified by the auxiliary winding is proportional to the output voltage Vo, so that when the range of the output voltage Vo is wider, the voltage range of the auxiliary voltage Vcc is also wider, the working voltage Vdd of a chip is limited by under-voltage protection, the number of turns of the auxiliary winding is ensured, when the output voltage Vo is lowest, the voltage of the auxiliary voltage Vcc needs to be greater than the lowest value of the working voltage Vdd of the chip, and when the output voltage Vo is highest, the voltage of the auxiliary power Vcc is greater than the maximum value of the working voltage Vdd of the chip. Therefore, the primary chip needs to be powered after certain processing is performed on the power supply Vcc of the auxiliary winding.
Disclosure of Invention
The invention aims to provide a voltage-stabilizing power supply module, which is used for solving the problem that the output voltage of the voltage-stabilizing power supply module can be stable when the output voltage changes.
In order to achieve the above and other related objects, in an embodiment of the invention, a voltage-stabilizing power supply module includes a first capacitor, a first switch, a second switch, and a second capacitor, where the first capacitor is connected in series with the first switch, the second switch is connected in series with the second capacitor and then connected in parallel with the first switch, two ends of the second capacitor are output ports of the voltage-stabilizing power supply module, and two ends of a branch of the series connection of the first capacitor and the first switch are input ports of the voltage-stabilizing power supply module.
In an embodiment of the invention, the first switch and the second switch are diodes, and the first switch and the second switch are connected in series in the same direction.
The invention also provides a wide output voltage range circuit which comprises a third switch, a fourth switch, a third capacitor and a transformer, wherein the third switch and the fourth switch are connected in series, a primary winding of the transformer is connected in series with the third capacitor and then connected in parallel with the third switch or the fourth switch, a secondary winding of the transformer is connected in parallel with a load, the wide output voltage range circuit also comprises a first capacitor, a first switch, a second switch and a second capacitor, the first capacitor is connected in series with the first switch, the second switch is connected in series with the second capacitor and then connected in parallel with the first switch, and two ends of a series branch of the first capacitor and the first switch are connected in parallel with an auxiliary winding of the transformer.
In an embodiment of the invention, the first switch and the second switch are diodes, and the first switch and the second switch are connected in series in the same direction.
In an embodiment of the present invention, the dotted terminal of the auxiliary winding is the same as the dotted terminal of the secondary winding.
In an embodiment of the invention, the dotted terminal of the auxiliary winding is opposite to the dotted terminal of the secondary winding.
In an embodiment of the invention, the wide output voltage range circuit further includes a fifth switch and a fifth capacitor, the fifth switch and the fifth capacitor are connected in series and then connected in parallel with the secondary winding, and two ends of the fifth capacitor are connected in parallel with the load.
The voltage-stabilizing power supply circuit provided for the asymmetric half-bridge flyback circuit successfully solves the problems of wide output range and unstable auxiliary winding power supply on the premise of hardly increasing the cost, increasing the complexity of a transformer, reducing the circuit efficiency and increasing the standby power consumption, and has very important practical value.
Drawings
FIG. 1 is a schematic diagram of a wide output voltage range circuit according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram of a wide output voltage range circuit according to a second embodiment of the present invention.
FIG. 3 is a schematic diagram of a wide output voltage range circuit according to a third embodiment of the present invention.
Fig. 4 is a schematic diagram of a fourth embodiment of the wide output voltage range circuit of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification to understand and read by those skilled in the art, and are not used to limit the practical limit conditions of the present invention, so they have no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, a switch S1 and a switch S2 are connected in series and then connected in parallel with a capacitor C1, two ends of the capacitor C1 are connected in parallel with an input voltage Vin, a primary winding Np of a transformer T1 is connected in series with a capacitor Cr and then connected in parallel with a switch S2, a secondary winding Ns of the transformer T1 is connected in series with a diode D1 and a capacitor C2, and two ends of the capacitor C2 output an output voltage Vo. The present embodiment is only exemplified by half-wave rectification, but the present invention is not limited thereto, and for example, full-wave rectification or synchronous rectification may be used as the embodiment of the present invention.
The transformer T1 also includes an auxiliary winding Na having a dotted terminal opposite to that of the secondary winding Ns. The auxiliary winding Na is connected with a capacitor C3 and a diode D2 in series, and two ends of the diode D2 are connected with a series branch of the capacitor C4 and a diode D3 in parallel. The capacitor C4 outputs the auxiliary voltage Vcc across it.
The working principle and process of the wide output voltage range circuit of the invention are explained as follows:
when the wide output voltage range circuit works in a steady state, the average value of the voltage on the capacitor Cr is approximately equal to Vo, Np/Ns, the capacitance value of the capacitor Cr is large, the instantaneous value of the voltage at the two ends of the capacitor Cr is equal to the average value Vo, Np/Ns in a switching period, when the switch S1 of the wide output voltage range circuit is switched on and the switch S2 is switched off, the voltage at the two ends of the auxiliary winding Na of the transformer T1 is equal to,
Va＝-Na*(Vin-Vcr)/Np＝-(Vin-Vo*Np/Ns)*Na/Np，
at the moment, the diode D2 is conducted, and the voltage VC3 across the capacitor C3 is equal to the voltage Va across the auxiliary winding;
when the switch S1 is turned off and the switch S2 is turned on, the voltage Va of the auxiliary winding Na is coupled to the output voltage Vo, and the voltage Va is:
Va＝Vo*Na/Ns,
at the moment, D2 is cut off, D3 is turned on, and the voltage on C4 is the sum of the voltage Va of the auxiliary winding Na and the voltage at the two ends of the capacitor C3;
Vcc＝Na*Vo/Ns+(Vin-Vo*Np/Ns)*Na/Np
＝Na*Vo/Ns+Vin*Na/Np-Vo*Na/Ns＝Vin*Na/Np
as can be seen from the above equation, the voltage across C4 is related to the input voltage Vin, the number of turns of the auxiliary winding Na, the number of turns of the primary winding Np, and is independent of the output voltage Vo. Because the wide output voltage range circuit is usually applied to the rear stage of the front stage with the PFC circuit, the output voltage of the PFC circuit is relatively stable, and the input voltage Vin of the wide output voltage range circuit is also relatively stable, the relatively stable auxiliary voltage Vcc, Vin Na3/Np can be obtained by selecting the appropriate turn ratio of the auxiliary winding Na and the primary winding Np, and the auxiliary voltage Vcc, Vin Na3/Np are irrelevant to the height of the output voltage. The voltage is higher than the undervoltage protection point of the chip power supply voltage Vdd and lower than the withstand voltage of the chip Vdd, so that the normal power supply of the control module is ensured.
In another embodiment of the wide output voltage range circuit of the present invention, as shown in fig. 2, the auxiliary winding is of the same name and the output winding Np is reversed, unlike the embodiment of fig. 1.
The average value of the voltage across the capacitor Cr is approximately equal to Vo × Np/Ns, and assuming that the capacitance of the capacitor Cr is large, the instantaneous value of the voltage across the capacitor Cr during the switching period is equal to the average value Vo × Np/Ns, when the switch S1 is turned on and the switch S2 is turned off, the voltage across the auxiliary winding Na of the transformer is,
Va＝Na*(Vin-Vcr)/Np＝(Vin-Vo*Np/Ns)*Na/Np，
when switch S1 is off and switch S2 is on, the auxiliary winding voltage Va is coupled to the output voltage Vo, the auxiliary winding voltage Va being:
Va＝-Na*Vo/Ns,
when the diode D2 is turned on, the voltage across the capacitor C3 is equal to the voltage Va across the auxiliary winding,
when the switch S1 is turned on again, the D2 is turned off, the D3 is turned on, and the voltage on the C4 is the sum of the winding voltage and the voltage across the C3;
VC4＝(Vin-Vo*Np/Ns)*Na3/Np+Na3*Vo/Ns
＝Vin*Na3/Np-Vo*Na3/Ns+Na3*Vo/Ns＝Vin*Na3/Np
as can be seen from the above equation, the sum of the voltages across C4 is related to the input voltage Vin, the number of turns Na3 in the auxiliary winding, the number of turns Np in the main winding, and is independent of the output voltage Vo.
In another embodiment of the wide output voltage range circuit of the present invention, shown in fig. 3, the capacitor Cr and the winding Np are connected in parallel with the switch S1, unlike the embodiment shown in fig. 1.
The working principle and process of the wide output voltage range circuit of the invention are explained as follows:
when the wide output voltage range circuit works in a steady state, the average value of the voltage on the capacitor Cr is approximately equal to Vo, Np/Ns, the capacitance value of the capacitor Cr is large, the instantaneous value of the voltage at the two ends of the capacitor Cr is equal to the average value Vo, Np/Ns in a switching period, when the switch S1 of the wide output voltage range circuit is turned off and the switch S2 is turned on, the voltage at the two ends of the auxiliary winding Na of the transformer T1 is equal to,
Va＝-Na*(Vin-Vcr)/Np＝-(Vin-Vo*Np/Ns)*Na/Np，
at the moment, the diode D2 is conducted, and the voltage VC3 across the capacitor C3 is equal to the voltage Va across the auxiliary winding;
when the switch S1 is turned on and the switch S2 is turned off, the voltage Va of the auxiliary winding Na is coupled to the output voltage Vo, and the voltage Va is:
Va＝Vo*Na/Ns,
at the moment, D2 is cut off, D3 is turned on, and the voltage on C4 is the sum of the voltage Va of the auxiliary winding Na and the voltage at the two ends of the capacitor C3;
Vcc＝Na*Vo/Ns+(Vin-Vo*Np/Ns)*Na/Np
＝Na*Vo/Ns+Vin*Na/Np-Vo*Na/Ns＝Vin*Na/Np
as can be seen from the above equation, the voltage across C4 is related to the input voltage Vin, the number of turns of the auxiliary winding Na, the number of turns of the primary winding Np, and is independent of the output voltage Vo. Because the wide output voltage range circuit is usually applied to the rear stage of the front stage with the PFC circuit, the output voltage of the PFC circuit is relatively stable, and the input voltage Vin of the wide output voltage range circuit is also relatively stable, the relatively stable auxiliary voltage Vcc, Vin Na3/Np can be obtained by selecting the appropriate turn ratio of the auxiliary winding Na and the primary winding Np, and the auxiliary voltage Vcc, Vin Na3/Np are irrelevant to the height of the output voltage. The voltage is higher than the undervoltage protection point of the chip power supply voltage Vdd and lower than the withstand voltage of the chip Vdd, so that the normal power supply of the control module is ensured.
In another embodiment of the wide output voltage range circuit of the present invention, as shown in fig. 4, the auxiliary winding is of the same name and the output winding Np is reversed, unlike the embodiment of fig. 3.
The average value of the voltage across the capacitor Cr is approximately equal to Vo × Np/Ns, and assuming that the capacitance of the capacitor Cr is large, the instantaneous value of the voltage across the capacitor Cr during the switching period is equal to the average value Vo × Np/Ns, when the switch S1 is turned on and the switch S2 is turned off, the voltage across the auxiliary winding Na of the transformer is,
Va＝Na*(Vin-Vcr)/Np＝(Vin-Vo*Np/Ns)*Na/Np，
when switch S1 is off and switch S2 is on, the auxiliary winding voltage Va is coupled to the output voltage Vo, the auxiliary winding voltage Va being:
Va＝-Na*Vo/Ns,
when the diode D2 is turned on, the voltage across the capacitor C3 is equal to the voltage Va across the auxiliary winding,
when the switch S1 is turned on again, the D2 is turned off, the D3 is turned on, and the voltage on the C4 is the sum of the winding voltage and the voltage across the C3;
VC4＝(Vin-Vo*Np/Ns)*Na3/Np+Na3*Vo/Ns
＝Vin*Na3/Np-Vo*Na3/Ns+Na3*Vo/Ns＝Vin*Na3/Np
as can be seen from the above equation, the sum of the voltages across C4 is related to the input voltage Vin, the number of turns Na3 in the auxiliary winding, the number of turns Np in the main winding, and is independent of the output voltage Vo.
The auxiliary voltage is related to the input voltage Vin, the turn ratio of the auxiliary winding Na to the primary winding Np and is unrelated to the output voltage Vo. By adjusting the turn ratio of Na and Np, a proper and stable auxiliary voltage can be obtained, the power supply voltage of the auxiliary winding is reduced, the power consumption of the auxiliary winding is reduced, the efficiency of a circuit is improved, the standby power consumption of the whole machine is reduced, and the cost of the linear voltage stabilizing circuit is saved. The cost of the voltage stabilizing circuit is reduced, and an additional auxiliary winding is eliminated, so that the design of the transformer is relatively simple, and the cost is lower.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The voltage-stabilizing power supply module is characterized by comprising a first capacitor, a first switch, a second switch and a second capacitor, wherein the first capacitor is connected with the first switch in series, the second switch is connected with the second capacitor in series and then connected with the first switch in parallel, two ends of the second capacitor are output ports of the voltage-stabilizing power supply module, and two ends of a series branch of the first capacitor and the first switch are input ports of the voltage-stabilizing power supply module.
2. The regulated power supply module according to claim 1, wherein said first switch and said second switch are diodes, and said first switch and said second switch are connected in series in the same direction.
3. The wide output voltage range circuit comprises a third switch, a fourth switch, a third capacitor and a transformer, wherein the third switch and the fourth switch are connected in series, a primary winding of the transformer is connected in series with the third capacitor and then connected in parallel with the third switch or the fourth switch, and a secondary winding of the transformer is connected in parallel with a load.
4. The wide output voltage range circuit of claim 3, wherein the first switch and the second switch are diodes, and wherein the first switch and the second switch are connected in series in the same direction.
5. The wide output voltage range circuit of claim 4, wherein the dotted terminal of the auxiliary winding is the same as the dotted terminal of the secondary winding.
6. The wide output voltage range circuit of claim 4, wherein the dotted terminal of the auxiliary winding is opposite to the dotted terminal of the secondary winding.
7. The wide output voltage range circuit of claim 3, further comprising a fifth switch and a fifth capacitor, wherein the fifth switch and the fifth capacitor are connected in series and then connected in parallel with the secondary winding, and two ends of the fifth capacitor are connected in parallel with the load.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771353A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Auxiliary source circuit for switch power supply |
| CN104779806A (en) * | 2015-04-30 | 2015-07-15 | 广州金升阳科技有限公司 | Asymmetrical half-bridge fly-back converter and control method thereof |
| CN105375783A (en) * | 2015-11-13 | 2016-03-02 | 广州金升阳科技有限公司 | Feedback control method, feedback control method based control method for asymmetric half bridge type flyback converter, and realization circuits for two methods |
| CN206389269U (en) * | 2016-10-26 | 2017-08-08 | 广州金升阳科技有限公司 | drive control circuit |
| CN113258784A (en) * | 2021-06-08 | 2021-08-13 | 成都芯源系统有限公司 | Power supply circuit of switching power supply and control method thereof |
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- 2021-12-09 CN CN202111502576.4A patent/CN114285288A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771353A (en) * | 2010-02-24 | 2010-07-07 | 英飞特电子（杭州）有限公司 | Auxiliary source circuit for switch power supply |
| CN104779806A (en) * | 2015-04-30 | 2015-07-15 | 广州金升阳科技有限公司 | Asymmetrical half-bridge fly-back converter and control method thereof |
| CN105375783A (en) * | 2015-11-13 | 2016-03-02 | 广州金升阳科技有限公司 | Feedback control method, feedback control method based control method for asymmetric half bridge type flyback converter, and realization circuits for two methods |
| CN206389269U (en) * | 2016-10-26 | 2017-08-08 | 广州金升阳科技有限公司 | drive control circuit |
| CN113258784A (en) * | 2021-06-08 | 2021-08-13 | 成都芯源系统有限公司 | Power supply circuit of switching power supply and control method thereof |
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