CN220139427U - Control circuit and system of boost converter - Google Patents
Control circuit and system of boost converter Download PDFInfo
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- CN220139427U CN220139427U CN202321642811.2U CN202321642811U CN220139427U CN 220139427 U CN220139427 U CN 220139427U CN 202321642811 U CN202321642811 U CN 202321642811U CN 220139427 U CN220139427 U CN 220139427U
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Abstract
The utility model belongs to the field of server power supplies, and relates to a control circuit and a control system of a boost converter. The first input end of the operational amplifier is respectively connected with the direct current control module and the alternating current control module, the second input end of the operational amplifier is used for accessing reference voltage, the direct current control module and the alternating current control module are also connected with the output end of the operational amplifier, and the output end of the operational amplifier is used for being connected with the boost converter. The operational amplifier is used for receiving input voltage and processing the input voltage according to the reference voltage so as to output a duty ratio based on a processing result, wherein a direct current component and an alternating current component of the input voltage are overlapped, the direct current control module is used for outputting the direct current duty ratio, the alternating current control module is used for adjusting the alternating current component in the duty ratio so as to output the alternating current duty ratio to calibrate the direct current duty ratio, and the duty ratio is enabled to quickly follow the change of the input voltage, so that the stability of the boost converter is improved.
Description
Technical Field
The utility model belongs to the technical field of server power supplies, and particularly relates to a control circuit and a control system of a boost converter.
Background
When the server power supply realizes direct current-direct current electric energy conversion, an alternating current component input always exists in a direct current input, so that the output voltage of the controller is influenced.
The prior art generally adopts a single ring (voltage ring or current ring) or a double ring (outer ring voltage ring and inner ring current ring are nested) to inhibit the interference of alternating current signals, but the reduction of the output voltage ripple size is also limited in this way, and the system is unstable when a weak power grid and surge test are performed.
Disclosure of Invention
The embodiment of the utility model provides a control circuit and a control system of a boost converter, which aim to solve the technical problem that the boost converter is unstable caused by alternating current components when a server power supply is tested in a weak power network and surge in the prior art.
In a first aspect, an embodiment of the present utility model provides a control circuit of a boost converter, applied to the boost converter, where the boost converter includes a dc source and a load, and the control circuit of the boost converter includes an operational amplifier, a dc control module, and an ac control module;
the first input end of the operational amplifier is respectively connected with the direct current control module and the alternating current control module, the second input end of the operational amplifier is used for accessing reference voltage, the direct current control module and the alternating current control module are also connected with the output end of the operational amplifier, the output end of the operational amplifier is used for being connected with the boost converter, the direct current control module is also used for being connected with the load, and the alternating current control module is also used for being connected with a direct current source;
the operational amplifier is used for receiving input voltage and processing the input voltage according to the reference voltage so as to output a duty ratio based on a processing result, wherein the input voltage is formed by overlapping a direct current component input by the direct current control module and an alternating current component input by the alternating current control module;
the DC control module is used for outputting a DC duty cycle, and the AC control module is used for adjusting an AC component in the duty cycle so as to output the AC duty cycle to calibrate the DC duty cycle.
In some embodiments, the dc control module includes a dc compensation unit and a common compensation unit;
the first end of the direct current compensation unit is connected with the load, the second end of the direct current compensation unit is respectively connected with the first input end of the operational amplifier and the first end of the common compensation unit, and the second end of the common compensation unit is connected with the output end of the operational amplifier.
In some embodiments, the dc compensation unit includes a resistor R1, a resistor R2, and a capacitor C1;
the first end of the resistor R1 is connected with the load, the second end of the resistor R1 is connected with the first end of the resistor R2, the second end of the resistor R2 is respectively connected with the first input end of the operational amplifier and the first end of the common compensation unit, and the capacitor C1 is connected with the resistor R2 in parallel.
In some embodiments, the ac control module includes an ac compensation unit and a common compensation unit;
the first end of the alternating current compensation unit is connected with the direct current source, the second end of the alternating current compensation unit is respectively connected with the first input end of the operational amplifier and the first end of the public compensation unit, and the second end of the public compensation unit is connected with the output end of the operational amplifier.
In some embodiments, the ac compensation unit includes a resistor R3 and a capacitor C2;
the first end of the capacitor C2 is connected with the direct current source, the second end of the capacitor C2 is connected with the first end of the resistor R3, and the second end of the resistor R3 is respectively connected with the first input end of the operational amplifier and the first end of the common compensation unit.
In some embodiments, the common compensation unit includes a first compensation subunit, a second compensation subunit, and a gain compensation subunit;
the first end of the first compensation subunit is connected with the first input end of the operational amplifier, the second end of the first compensation subunit is connected with the output end of the operational amplifier, and the second compensation subunit and the gain compensation subunit are connected with the first compensation subunit in parallel.
In some embodiments, the first compensation subunit includes a resistor R4 and a capacitor C3;
the first end of the capacitor C3 is connected with the first input end of the operational amplifier, the second end of the capacitor C3 is connected with the first end of the resistor R4, and the second end of the resistor R4 is connected with the output end of the operational amplifier.
In some embodiments, the second compensation subunit is a capacitor C4;
the first end of the capacitor C4 is connected with the first input end of the operational amplifier, and the second end of the capacitor C4 is connected with the output end of the operational amplifier.
In some embodiments, the gain compensation subunit is a resistor R5;
the first end of the resistor R5 is connected with the first input end of the operational amplifier, and the second end of the resistor R5 is connected with the output end of the operational amplifier. .
In a second aspect, an embodiment of the present utility model provides a control system for a boost converter, including:
a boost converter; and
the control circuit of the boost converter as described above.
In an embodiment of the utility model, a control circuit and a control system of a boost converter are provided, the control circuit is applied to the boost converter, the boost converter comprises a direct current source and a load, and the control circuit of the boost converter comprises an operational amplifier, a direct current control module and an alternating current control module. The first input end of the operational amplifier is respectively connected with the direct current control module and the alternating current control module, the second input end of the operational amplifier is used for accessing reference voltage, the direct current control module and the alternating current control module are also connected with the output end of the operational amplifier, the output end of the operational amplifier is used for being connected with the boost converter, the direct current control module is also used for being connected with the load, and the alternating current control module is also used for being connected with a direct current source. The operational amplifier is used for receiving input voltage and processing the input voltage according to the reference voltage so as to output a duty ratio based on a processing result, wherein the input voltage is formed by superposition of a direct current component input by the direct current control module and an alternating current component input by the alternating current control module, the direct current control module is used for outputting the direct current duty ratio, and the alternating current control module is used for adjusting the alternating current component in the duty ratio so as to output the alternating current duty ratio to calibrate the direct current duty ratio, so that the duty ratio quickly follows the change of the input voltage, and the stability of the boost converter is improved.
Drawings
FIG. 1 is a block diagram of a control system for a boost converter according to an embodiment of the present utility model;
FIG. 2 is a circuit diagram of a boost converter provided by an embodiment of the present utility model;
FIG. 3 is a block diagram of a control circuit for a boost converter according to an embodiment of the present utility model;
fig. 4 is a circuit diagram of a control circuit of a boost converter according to an embodiment of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be described in detail below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Features of the various embodiments of the utility model described below may be combined with one another without constituting any conflict.
When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more.
Referring to fig. 1, fig. 1 is a block diagram of a control system of a boost converter according to an embodiment of the present utility model, and as shown in fig. 1, a control system 100 of a boost converter includes a control circuit 10 of the boost converter and a boost converter 20. The control circuit 10 of the boost converter is connected to the boost converter 20, and the control circuit 10 of the boost converter is configured to receive a voltage signal of the boost converter 20, process the voltage signal to output a duty cycle, generate a pulse signal through a pulse generator, and control the operation of the boost converter 20, so as to reduce the influence of an ac component on the boost converter 20 during a weak power grid or surge test, thereby increasing the stability of the boost converter 20.
Further, as shown in fig. 2, fig. 2 is a circuit diagram of a boost converter according to an embodiment of the present utility model, and as shown in fig. 2, the boost converter 20 includes a dc source 21, an inductor L, a switching tube Q1, a diode D1, a capacitor C, and a load 22; the first end of the direct current source 21 is connected with the first end of the inductor L, the second end of the inductor L is connected with the control end of the switching tube Q1 and the anode of the diode D1, the cathode of the diode D1 is connected with the first end of the capacitor C and the first end of the load 22, the second end of the direct current source 21 is connected with the second end of the switching tube Q1, the second end of the capacitor C and the second end of the load 22, and the control end of the switching tube Q1 is connected with the control circuit 10 of the boost converter. The dc source 21 includes an ac component, the load 22 is equivalently replaced by a controlled current source, the inductor L, the switching tube Q1, and the diode D1 form a boost module, and the capacitor C is a voltage stabilizing module. It should be noted that, since the dc source 21 includes an ac component, when the dc source 21 supplies a current to the boost converter 20, the dc and the ac component in the dc source 21 are superimposed and input to the boost module, and at this time, in order to avoid the influence of the ac component on the boost module, the control circuit 10 of the boost converter may acquire the voltages on the dc source 21 and the load 22, process the ac component in the dc source 21, and then correct the dc duty ratio generated by the dc control module 12 based on the ac duty ratio generated by the processing of the ac control module 13, and finally control the operating state of the switching tube Q1, thereby reducing the influence of the ac component on the boost converter 20 and improving the stability of the boost converter 20.
Referring to fig. 3, fig. 3 is a block diagram illustrating a control circuit of a boost converter according to an embodiment of the present utility model, and as shown in fig. 3, a control circuit 10 of the boost converter includes an operational amplifier 11, a dc control module 12 and an ac control module 13. The first input end of the operational amplifier 11 is respectively connected with the direct current control module 12 and the alternating current control module 13, the second input end of the operational amplifier 11 is used for accessing reference voltage, the direct current control module 12 and the alternating current control module 13 are also connected with the output end of the operational amplifier 11, the direct current control module 12 is also used for being connected with the load 22, the alternating current control module 13 is also used for being connected with the direct current source 21, and the output end of the operational amplifier 11 is used for being connected with the boost converter 20.
The operational amplifier 11 is configured to receive an input voltage, and process the input voltage according to the reference voltage, so as to output a duty cycle based on a processing result, where the input voltage is formed by overlapping a direct current component input by the direct current control module 12 with an alternating current component input by the alternating current control module 13; the dc control module 12 is configured to output a dc duty cycle, and the ac control module 13 is configured to adjust an ac component in the duty cycle to output an ac duty cycle to calibrate the dc duty cycle. It should be noted that the processing result may be a voltage value, by comparing the input voltage with the reference voltage, so as to obtain a voltage difference between the input voltage and the reference voltage, and adjusting the voltage difference through the ac control module 13, thereby adjusting a deviation caused by an ac component in the voltage difference, and further improving stability of the boost converter 20. The reference voltage is used to set a stable value of the output voltage of the operational amplifier 11, that is, the output voltage of the operational amplifier 11 is determined by the reference voltage, and then the duration of the output voltage is set to determine the duty ratio of the output of the operational amplifier 11. It is known that the duty ratio of the output of the operational amplifier 11 is composed of a dc duty ratio and an ac duty ratio, but the stability of the boost converter 20 is affected in practical use due to the instability of the ac component. Thus, by adjusting the ac duty cycle, the duty cycle of the output of the operational amplifier 11 can be calibrated, thereby reducing the effect of the ac component on the boost converter 20.
In some embodiments, as shown in fig. 2, the control circuit 10 of the boost converter further includes a pulse generator 14, an input terminal of the pulse generator 14 is connected to the output terminal of the operational amplifier 11, and an output terminal of the pulse generator 14 is connected to the boost converter 20. The pulse generator 14 is configured to output a pulse signal based on the calibrated output duty cycle to control the operation of the boost converter 20 according to the pulse signal.
In some embodiments, the operational amplifier 11 is an inverting amplifier, the first input terminal of the operational amplifier 11 is an inverting input terminal, the second input terminal of the operational amplifier 11 is a forward input terminal, the operational amplifier 11 obtains a processing result by subtracting the voltage (voltage signal) of the inverting input terminal from the voltage (reference voltage) of the forward input terminal, the processing result is further adjusted based on the ac control module 13, and the adjusted processing result is input to the pulse generator 14 to control the operation of the boost converter 20 according to the pulse signal.
Further, as shown in fig. 3, the dc control module 12 includes a dc compensation unit 121 and a common compensation unit 123; the ac control module 13 includes an ac compensation unit 122 and a common compensation unit 123.
The first end of the dc compensation unit 121 is connected to the load 22, the second end of the dc compensation unit 121 is connected to the first input end of the operational amplifier 11 and the first end of the common compensation unit 123, and the second end of the common compensation unit 123 is connected to the output end of the operational amplifier 11. The first end of the ac compensation unit 122 is connected to the dc source 21, the second end of the ac compensation unit 122 is connected to the first input end of the operational amplifier 11 and the first end of the common compensation unit 123, and the second end of the common compensation unit 123 is connected to the output end of the operational amplifier 11.
The dc compensation unit 121 is configured to receive a first voltage on the load 22, the ac compensation unit 122 is configured to receive a second voltage on the dc source 21, and when the dc compensation unit 121 and the ac compensation unit 122 receive the first voltage and the second voltage, respectively, the first voltage and the second voltage are overlapped to obtain an input voltage, and the input voltage is input to a first input terminal of the operational amplifier 11, at this time, the operational amplifier 11 processes the input voltage and the reference voltage, and adjusts an ac component in the processing result through the ac control module 13, and finally, the adjusted voltage is input to the pulse generator 14, so that the pulse generator 14 outputs a pulse signal with a preset duty ratio to the boost converter 20 according to the adjusted voltage. The first voltage received by the dc compensation unit 121 is a dc component, and the second voltage received by the ac compensation unit 122 includes both a dc component and an ac component.
As shown in fig. 3, the common compensation unit 123 includes a first compensation subunit 1231, a second compensation subunit 1231, and a gain compensation subunit 1233; the first end of the first compensation subunit 1231 is connected to the first input end of the operational amplifier 11, the second end of the first compensation subunit 1231 is connected to the output end of the operational amplifier 11, and the second compensation subunit 1232 and the gain compensation subunit 1233 are both connected in parallel to the first compensation subunit 1231.
Wherein the first compensation subunit 1231 is configured to adjust an intermediate frequency component of the ac component in the processing result, the second compensation subunit 1232 is configured to adjust a high frequency component of the ac component in the processing result, and the gain compensation subunit 1233 is configured to adjust an open-loop gain in the processing result.
Referring to fig. 4, fig. 4 is a circuit diagram of a control circuit of a boost converter according to an embodiment of the utility model, and as shown in fig. 4, a control circuit 10 of the boost converter includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4.
The resistor R1, the resistor R2, and the capacitor C1 form the dc compensation unit 121. The first end of the resistor R1 is connected to the load 22, the second end of the resistor R1 is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the first input end of the operational amplifier 11 and the first end of the common compensation unit 123, and the capacitor C1 is connected in parallel to the resistor R2. Specifically, after the first voltage is received, the first voltage is input to the first input end of the operational amplifier 11 through the resistor R1, the resistor R2 and the capacitor C1, and at this time, the resistor R1, the resistor R2 and the capacitor C3 provide a high-frequency pole for filtering out high-frequency components in the first voltage.
The resistor R3 and the capacitor C2 form the ac compensation unit 122; the first end of the capacitor C2 is connected to the dc source 21, the second end of the capacitor C2 is connected to the first end of the resistor R3, and the second end of the resistor R3 is connected to the first input end of the operational amplifier 11 and the first end of the common compensation unit 123, respectively. Specifically, when the second voltage is received, the second voltage is input to the first input terminal of the operational amplifier 11 through the capacitor C2 and the resistor R3, and at this time, the capacitor C2 and the resistor R3 provide an intermediate frequency pole.
The resistor R4 and the capacitor C3 form the first compensation subunit 1231; the first end of the capacitor C3 is connected to the first input end of the operational amplifier 11, the second end of the capacitor C3 is connected to the first end of the resistor R4, and the second end of the resistor R4 is connected to the output end of the operational amplifier 11. Specifically, after the first voltage and the second voltage are superimposed and input to the first input end of the operational amplifier 11, the ac component in the second voltage flows through the ac compensator formed by the resistor R3, the capacitor C2, the resistor R4, the resistor R5, the capacitor C3 and the capacitor C4, and finally an ac duty cycle is output, where the intermediate frequency pole provided by the resistor R3 and the capacitor C2 interacts with the intermediate frequency zero provided by the resistor R4 and the capacitor C3 to calibrate the frequency and the bandwidth of the ac component in the second voltage.
The capacitor C4 is a second compensation subunit 1232; the first end of the capacitor C4 is connected to the first input end of the operational amplifier 11, and the second end of the capacitor C4 is connected to the output end of the operational amplifier 11. The capacitor C4 is configured to provide a high-frequency pole, and by changing the capacity of the capacitor C4, the filtering point of the high-frequency component can be changed.
The resistor R5 is the gain compensation subunit 1233, a first end of the resistor R5 is connected to the first input terminal of the operational amplifier 11, and a second end of the resistor R5 is connected to the output terminal of the operational amplifier 11. The capacitor C2 and the resistor R5 together determine an open-loop gain in the operational amplifier 11, the open-loop dc gain is adjusted by the resistor R5, and the capacitor C2 adjusts the open-loop ac gain.
The utility model provides a control circuit and a control system of a boost converter, which are applied to the boost converter. The first input end of the operational amplifier is respectively connected with the direct current control module and the alternating current control module, the second input end of the operational amplifier is used for accessing reference voltage, the direct current control module and the alternating current control module are also connected with the output end of the operational amplifier, the output end of the operational amplifier is used for being connected with the boost converter, the direct current control module is also used for being connected with the load, and the alternating current control module is also used for being connected with a direct current source. The operational amplifier is used for receiving input voltage and processing the input voltage according to the reference voltage so as to output a duty ratio based on a processing result, wherein the input voltage is formed by overlapping a direct current component input by the direct current control module and an alternating current component input by the alternating current control module, the direct current control module is used for outputting the direct current duty ratio, and the alternating current control module is used for adjusting the alternating current component in the duty ratio so as to output the alternating current duty ratio to calibrate the direct current duty ratio, so that the duty ratio quickly changes along with the input voltage, output voltage ripple is reduced, and stability of the boost converter is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; combinations of features of the above embodiments or in different embodiments are possible within the idea of the utility model, and many other variations of the different aspects of the utility model as described above exist, which are not provided in detail for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. A control circuit of a boost converter, wherein the control circuit is applied to the boost converter, the boost converter comprises a direct current source and a load, and the control circuit of the boost converter comprises an operational amplifier, a direct current control module and an alternating current control module;
the first input end of the operational amplifier is respectively connected with the direct current control module and the alternating current control module, the second input end of the operational amplifier is used for accessing reference voltage, the direct current control module and the alternating current control module are also connected with the output end of the operational amplifier, the output end of the operational amplifier is used for being connected with the boost converter, the direct current control module is also used for being connected with the load, and the alternating current control module is also used for being connected with a direct current source;
the operational amplifier is used for receiving input voltage and processing the input voltage according to the reference voltage so as to output a duty ratio based on a processing result, wherein the input voltage is formed by overlapping a direct current component input by the direct current control module and an alternating current component input by the alternating current control module;
the DC control module is used for outputting a DC duty cycle, and the AC control module is used for adjusting an AC component in the duty cycle so as to output the AC duty cycle to calibrate the DC duty cycle.
2. The boost converter control circuit of claim 1, wherein the dc control module includes a dc compensation unit and a common compensation unit;
the first end of the direct current compensation unit is connected with the load, the second end of the direct current compensation unit is respectively connected with the first input end of the operational amplifier and the first end of the common compensation unit, and the second end of the common compensation unit is connected with the output end of the operational amplifier.
3. The control circuit of a boost converter according to claim 2, wherein the dc compensation unit comprises a resistor R1, a resistor R2, and a capacitor C1;
the first end of the resistor R1 is connected with the load, the second end of the resistor R1 is connected with the first end of the resistor R2, the second end of the resistor R2 is respectively connected with the first input end of the operational amplifier and the first end of the common compensation unit, and the capacitor C1 is connected with the resistor R2 in parallel.
4. The control circuit of a boost converter of claim 2, wherein the ac control module includes an ac compensation unit and a common compensation unit;
the first end of the alternating current compensation unit is connected with the direct current source, the second end of the alternating current compensation unit is respectively connected with the first input end of the operational amplifier and the first end of the public compensation unit, and the second end of the public compensation unit is connected with the output end of the operational amplifier.
5. The boost converter control circuit of claim 4, wherein said ac compensation unit includes a resistor R3 and a capacitor C2;
the first end of the capacitor C2 is connected with the direct current source, the second end of the capacitor C2 is connected with the first end of the resistor R3, and the second end of the resistor R3 is respectively connected with the first input end of the operational amplifier and the first end of the common compensation unit.
6. The boost converter control circuit of claim 4, wherein the common compensation unit comprises a first compensation subunit, a second compensation subunit, and a gain compensation subunit;
the first end of the first compensation subunit is connected with the first input end of the operational amplifier, the second end of the first compensation subunit is connected with the output end of the operational amplifier, and the second compensation subunit and the gain compensation subunit are connected with the first compensation subunit in parallel.
7. The boost converter control circuit of claim 5, wherein said first compensation subunit includes a resistor R4 and a capacitor C3;
the first end of the capacitor C3 is connected with the first input end of the operational amplifier, the second end of the capacitor C3 is connected with the first end of the resistor R4, and the second end of the resistor R4 is connected with the output end of the operational amplifier.
8. The boost converter control circuit of claim 6, wherein said second compensation subunit is a capacitor C4;
the first end of the capacitor C4 is connected with the first input end of the operational amplifier, and the second end of the capacitor C4 is connected with the output end of the operational amplifier.
9. The boost converter control circuit of claim 7, wherein said gain compensation subunit is a resistor R5;
the first end of the resistor R5 is connected with the first input end of the operational amplifier, and the second end of the resistor R5 is connected with the output end of the operational amplifier.
10. A control system for a boost converter, the control system comprising:
a boost converter; and
a control circuit for a boost converter according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321642811.2U CN220139427U (en) | 2023-06-26 | 2023-06-26 | Control circuit and system of boost converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321642811.2U CN220139427U (en) | 2023-06-26 | 2023-06-26 | Control circuit and system of boost converter |
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| Publication Number | Publication Date |
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| CN220139427U true CN220139427U (en) | 2023-12-05 |
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| CN202321642811.2U Active CN220139427U (en) | 2023-06-26 | 2023-06-26 | Control circuit and system of boost converter |
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| CN (1) | CN220139427U (en) |
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