CN217063560U - PFC dynamic voltage regulating circuit - Google Patents
PFC dynamic voltage regulating circuit Download PDFInfo
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- CN217063560U CN217063560U CN202220708687.4U CN202220708687U CN217063560U CN 217063560 U CN217063560 U CN 217063560U CN 202220708687 U CN202220708687 U CN 202220708687U CN 217063560 U CN217063560 U CN 217063560U
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Abstract
The utility model discloses a PFC dynamic voltage regulating circuit, which is applied to a PFC voltage regulating circuit comprising a PFC chip and is connected with a voltage feedback end of the PFC chip; the method comprises the following steps: the first end of the first voltage division unit is an input end of the dynamic voltage regulation circuit; the first end of the second voltage division unit is connected with the second end of the first voltage division unit; the connection point of the first voltage division unit and the second voltage division unit is connected with the voltage feedback end of the PFC chip; a first end of the third voltage division unit is connected with a voltage feedback end of the PFC chip; the switching tube unit is configured to be controlled by an input voltage of the input end of the dynamic voltage regulating circuit to conduct connection between the second end and the third end of the switching tube unit. The utility model discloses simple structure, the discrete component that the application is easy to obtain can realize PFC dynamic voltage control process, does not need higher rated voltage's aluminum electrolytic capacitor can satisfy the requirement of wide range input voltage, can realize PFC power factor correction in the input voltage scope of broad, and the cost is lower.
Description
Technical Field
The utility model relates to a PFC technical field, concretely relates to PFC developments voltage control circuit.
Background
The input voltage of the PFC circuit on the market is normally in the range of 90-265Vac, and the output voltage is normally set at 400V. When the input voltage is higher than the normal output voltage of the PFC circuit (for example, the input voltage is higher than 400V), the PFC circuit does not work because the input voltage is higher than the output voltage, the current waveform distortion is severe, and the output voltage is unstable and has large fluctuation. The PFC circuit is usually provided with an aluminum electrolytic capacitor, and if the normal range of the input voltage and the value of the output voltage of the PFC circuit are to be increased, an aluminum electrolytic capacitor with a higher rated voltage needs to be selected, which increases the cost.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides a PFC developments voltage control circuit can realize PFC developments voltage control, satisfies wide range input voltage's requirement.
The utility model provides a PFC dynamic voltage regulating circuit, which is applied to a PFC voltage regulating circuit comprising a PFC chip, wherein the PFC dynamic voltage regulating circuit is connected with a voltage feedback end of the PFC chip; the method comprises the following steps:
a first voltage division unit, wherein a first end of the first voltage division unit is an input end of the dynamic voltage regulation circuit;
the first end of the second voltage division unit is connected with the second end of the first voltage division unit; the connection point of the first voltage division unit and the second voltage division unit is connected with the voltage feedback end of the PFC chip;
a first end of the third voltage division unit is connected with a voltage feedback end of the PFC chip;
a first end of the switching tube unit is connected with the input end of the dynamic voltage regulating circuit, a second end of the switching tube unit is connected with a second end of the third voltage dividing unit, and a third end of the switching tube unit is connected with a second end of the second voltage dividing unit; the switching tube unit is configured to be controlled by an input voltage of the input end of the dynamic voltage regulating circuit to conduct connection between the second end and the third end of the switching tube unit.
Preferably, the first voltage division unit includes one or more resistors.
Preferably, the second voltage division unit includes one or more resistors.
Preferably, the third voltage division unit includes one or more resistors.
Preferably, the switch tube unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first switch tube, a second switch tube, a third switch tube, a first capacitor and a voltage regulator tube;
the first end of the first switch tube is connected with the second end of the third voltage division unit, and the second end of the first switch tube is grounded; the third end of the first switch tube is connected with the first end of the second switch tube, the second end of the second switch tube is grounded, and the first resistor is connected in parallel between the second end of the second switch tube and the third end of the second switch tube;
the third end of the first switch tube is also connected with the first end of the second resistor, and the second end of the second resistor is respectively connected with the first end of the third resistor and the first end of the fourth resistor; the second end of the third resistor is connected with a power supply; the second end of the fourth resistor is connected with the first end of the third switching tube, and the second end of the third switching tube is grounded; the first capacitor is connected with the fifth resistor in parallel and then connected between the second end of the third switching tube and the third end of the third switching tube in parallel, the third end of the third switching tube is also connected with the first end of the sixth resistor, and the second end of the sixth resistor is connected with the input end of the dynamic voltage regulating circuit; the third end of the second switch tube is also connected with the first end of the voltage-stabilizing tube, and the second end of the voltage-stabilizing tube is connected with the second end of the second resistor.
Preferably, the first switching tube includes a field effect transistor.
Preferably, the second switch tube comprises a triode; the third switch tube comprises a triode.
Preferably, the zener diode comprises a zener diode.
The utility model has the advantages that:
the structure is simple, and the PFC dynamic voltage regulation process can be realized by using easily-obtained discrete components. When the PFC voltage regulation circuit is applied to a PFC voltage regulation circuit comprising a PFC chip, the PFC voltage is not required to be always output like a traditional circuit, the requirement of wide-range input voltage can be met without an aluminum electrolytic capacitor with higher rated voltage, PFC power factor correction can be realized in a wider input voltage range, and the PFC voltage regulation circuit has higher economic benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a PFC dynamic voltage regulation circuit, which is applied to a PFC voltage regulation circuit including a PFC chip, where the PFC dynamic voltage regulation circuit is connected to a voltage feedback end of the PFC chip; the method comprises the following steps:
the first end of the first voltage division unit is an input end of the dynamic voltage regulation circuit;
the first end of the second voltage division unit is connected with the second end of the first voltage division unit; the connection point of the first voltage division unit and the second voltage division unit is connected with the voltage feedback end of the PFC chip;
a first end of the third voltage division unit is connected with a voltage feedback end of the PFC chip;
a first end of the switching tube unit is connected with the input end of the dynamic voltage regulating circuit, a second end of the switching tube unit is connected with a second end of the third voltage dividing unit, and a third end of the switching tube unit is connected with a second end of the second voltage dividing unit; the switching tube unit is configured to be controlled by an input voltage of the input end of the dynamic voltage regulating circuit to conduct connection between the second end and the third end of the switching tube unit.
In this embodiment, the input terminal of the dynamic voltage adjusting circuit is connected to the input terminal of the PFC chip and the input terminal of the PFC voltage adjusting circuit. When the input voltage of the input end of the dynamic voltage regulating circuit is larger than a preset threshold value, the second end and the third end of the switching tube unit are conducted, the second voltage dividing unit and the third voltage dividing unit are connected in parallel, the first end of the second voltage dividing unit, namely the potential of the voltage feedback end of the PFC chip, becomes low, the voltage of the voltage feedback end of the PFC chip changes and is fed back to the PFC chip, and the PFC chip regulates the output voltage. In this embodiment, the first voltage dividing unit, the second voltage dividing unit, and the third voltage dividing unit may be set according to actual needs, and when the input voltage at the input end of the dynamic voltage regulating circuit is greater than the normal range, the potential at the voltage feedback end of the PFC chip decreases, and the output voltage of the PFC voltage regulating circuit increases.
In this embodiment, the first voltage dividing unit includes one or more resistors, the second voltage dividing unit includes one or more resistors, and the third voltage dividing unit includes one or more resistors. When the number of resistors is multiple, the resistors may be connected in series or in parallel, and the present invention is not limited herein. The resistance values of the first voltage division unit, the second voltage division unit and the third voltage division unit can be set according to actual needs.
As shown in fig. 2, in the present embodiment, the switch tube unit includes a resistor R6, a resistor R7, a resistor R3, a resistor R8, a resistor R9, a resistor R4, a first switch tube VM1, a second switch tube VT1, a third switch tube VT2, a capacitor C1, and a voltage regulator.
The first terminal of the first switch transistor VM1 is connected to the second terminal of the third voltage dividing unit, and the second terminal of the first switch transistor VM1 is grounded. The third end of the first switching tube VM1 is connected with the first end of the second switching tube VT1, the second end of the second switching tube VT1 is grounded, and a resistor R6 is connected in parallel between the second end of the second switching tube VT1 and the third end of the second switching tube VT 1.
The third end of the first switch transistor VM1 is further connected to the first end of the resistor R7, the second end of the resistor R7 is connected to the first end of the resistor R3 and the first end of the resistor R8, and the second end of the resistor R3 is connected to the power source VCC. The second end of the resistor R8 is connected with the first end of the third switching tube VT2, and the second end of the third switching tube VT2 is grounded. The capacitor C1 is connected in parallel with the resistor R9 and then connected in parallel between the second terminal of the third switching tube VT2 and the third terminal of the third switching tube VT2, the third terminal of the third switching tube VT2 is further connected with the first terminal of the resistor R4, and the second terminal of the resistor R4 is connected with the input terminal of the dynamic voltage adjusting circuit.
The third end of the second switch tube VT1 is also connected with the first end of the voltage regulator tube, and the second end of the voltage regulator tube is connected with the second end of the resistor R7.
The first switch tube includes but is not limited to a field effect transistor, and the first switch tube may be an N-type field effect transistor or an NPN-type triode. The first terminal of the first switching tube VM1 is a drain, the second terminal of the first switching tube VM1 is a source, and the third terminal of the first switching tube VM1 is a gate. The second switching tube VT1 and the third switching tube VT2 include but are not limited to a transistor, and the second switching tube VT1 and the third switching tube VT2 may be NPN transistors or PNP transistors. In this embodiment, the second switching tube VT1 and the third switching tube VT2 are both NPN transistors. The first ends of the second switching tube VT1 and the third switching tube VT2 are collectors, the second ends of the second switching tube VT1 and the third switching tube VT2 are emitters, and the third ends of the second switching tube VT1 and the third switching tube VT2 are bases.
In this embodiment, the voltage regulator includes, but is not limited to, a voltage regulator diode, and the first end of the voltage regulator diode is an anode and the second end is a cathode.
In this embodiment, when the input voltage VIN at the input terminal of the dynamic voltage regulating circuit is in a normal range (i.e., the PFC voltage regulating circuit operates normally), the power supply VCC breaks through the zener diode VZ1 through the resistor R3, and the transistor VT1 is turned on, so that the gate of the fet VM1 is at a low level, and the fet VM1 is in a high-impedance state. At this time, the resistor R1 and the resistor R5 divide the voltage to the voltage feedback terminal FB of the PFC chip, and the resistor R2 does not participate in the voltage regulation of the voltage feedback terminal FB. When the input voltage VIN at the input end of the dynamic voltage regulating circuit is larger than the normal range, the triode VT2 is driven to be conducted through voltage division of the resistor R4 and the resistor R9, and the cathode voltage of the voltage stabilizing diode VZ1 is lower than the breakdown voltage, so that the triode VT1 is in a high-impedance state. At this time, the power source VCC drives the fet VM1 to be turned on through the resistor R3 and the resistor R7, and the resistor R2 and the resistor R5 are connected in parallel, so that when the input voltage VIN is sufficiently high (larger than a normal range), the potential of the voltage feedback terminal FB is adjusted, and the PFC voltage adjustment circuit outputs a higher voltage.
When the PFC dynamic voltage regulation circuit is applied to a PFC voltage regulation circuit including a PFC chip, if an input voltage VIN at an input terminal of the PFC dynamic voltage regulation circuit is within a normal range (e.g., 90-265Vac), the PFC voltage regulation circuit outputs a normal value (e.g., 400 Vdc). When the input voltage is 300Vac occasionally, the output voltage of the PFC voltage regulation circuit is automatically adjusted to the higher range (such as 430-440Vdc), so that when the input voltage VIN exceeds the normal range, the PFC voltage regulation circuit outputs the voltage in the higher range (such as 430-440 Vdc).
The embodiment of the utility model provides a pair of PFC developments voltage control circuit, simple structure, the discrete component that the application was easily got can realize PFC developments voltage control process. When the PFC voltage regulation circuit is applied to a PFC voltage regulation circuit comprising a PFC chip, the PFC voltage is not required to be always output like a traditional circuit, the requirement of wide-range input voltage can be met without an aluminum electrolytic capacitor with higher rated voltage, PFC power factor correction can be realized in a wider input voltage range, and the PFC voltage regulation circuit has higher economic benefit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included in the scope of the claims and description of the present invention.
Claims (8)
1. A PFC dynamic voltage regulating circuit is applied to a PFC voltage regulating circuit comprising a PFC chip and is connected with a voltage feedback end of the PFC chip; it is characterized by comprising the following steps:
a first voltage division unit, wherein a first end of the first voltage division unit is an input end of the dynamic voltage regulation circuit;
the first end of the second voltage division unit is connected with the second end of the first voltage division unit; the connection point of the first voltage division unit and the second voltage division unit is connected with the voltage feedback end of the PFC chip;
a first end of the third voltage division unit is connected with a voltage feedback end of the PFC chip;
a first end of the switching tube unit is connected with the input end of the dynamic voltage regulating circuit, a second end of the switching tube unit is connected with a second end of the third voltage dividing unit, and a third end of the switching tube unit is connected with a second end of the second voltage dividing unit; the switching tube unit is configured to be controlled by an input voltage of the input end of the dynamic voltage regulating circuit to conduct connection between the second end and the third end of the switching tube unit.
2. The PFC dynamic voltage regulation circuit of claim 1, wherein the first voltage division unit comprises one or more resistors.
3. The PFC dynamic voltage regulation circuit of claim 1, wherein the second voltage divider block comprises one or more resistors.
4. The PFC dynamic voltage regulation circuit of claim 1, wherein the third voltage divider unit comprises one or more resistors.
5. The PFC dynamic voltage regulation circuit according to claim 1, wherein the switch tube unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first switch tube, a second switch tube, a third switch tube, a first capacitor and a voltage regulator tube;
the first end of the first switch tube is connected with the second end of the third voltage division unit, and the second end of the first switch tube is grounded; the third end of the first switch tube is connected with the first end of the second switch tube, the second end of the second switch tube is grounded, and the first resistor is connected between the second end of the second switch tube and the third end of the second switch tube in parallel;
the third end of the first switch tube is also connected with the first end of the second resistor, and the second end of the second resistor is respectively connected with the first end of the third resistor and the first end of the fourth resistor; the second end of the third resistor is connected with a power supply; the second end of the fourth resistor is connected with the first end of the third switching tube, and the second end of the third switching tube is grounded; the first capacitor is connected with the fifth resistor in parallel and then connected between the second end of the third switching tube and the third end of the third switching tube in parallel, the third end of the third switching tube is also connected with the first end of the sixth resistor, and the second end of the sixth resistor is connected with the input end of the dynamic voltage regulating circuit; the third end of the second switch tube is also connected with the first end of the voltage-stabilizing tube, and the second end of the voltage-stabilizing tube is connected with the second end of the second resistor.
6. The PFC dynamic voltage adjustment circuit of claim 5, wherein the first switching tube comprises a field effect transistor.
7. The PFC dynamic voltage regulation circuit of claim 5, wherein the second switching tube comprises a triode; the third switch tube comprises a triode.
8. The PFC dynamic voltage regulation circuit of claim 5, wherein the regulator tube comprises a zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708687.4U CN217063560U (en) | 2022-03-29 | 2022-03-29 | PFC dynamic voltage regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708687.4U CN217063560U (en) | 2022-03-29 | 2022-03-29 | PFC dynamic voltage regulating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217063560U true CN217063560U (en) | 2022-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220708687.4U Active CN217063560U (en) | 2022-03-29 | 2022-03-29 | PFC dynamic voltage regulating circuit |
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| Country | Link |
|---|---|
| CN (1) | CN217063560U (en) |
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2022
- 2022-03-29 CN CN202220708687.4U patent/CN217063560U/en active Active
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