A control circuit for an interleaved parallel Boost circuit

Abstract

The present application discloses a control circuit for an interleaved parallel Boost circuit, including a monitoring circuit; the monitoring end of the monitoring circuit is connected to the monitoring point of the interleaved parallel Boost main circuit, and is used for monitoring the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit; the input end of the monitoring circuit is connected to the output end of the interleaved parallel Boost main circuit, and is used for receiving the output voltage signal of the interleaved parallel Boost main circuit; the output end of the monitoring circuit is connected to the control end of the interleaved parallel Boost main circuit, and is used for outputting an adjustable drive control signal to the interleaved parallel Boost main circuit; the monitoring circuit is used for generating a drive control signal by using the current signal and the output voltage signal of each circuit in the interleaved parallel Boost main circuit; the present application controls each circuit through the monitoring circuit to make up for the current deviation generated by each circuit, ensures that the current signals output by each circuit in the interleaved parallel Boost main circuit are equal, improves the reliability of the circuit, and avoids the damage caused by unequal current in each path.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuit control, and in particular to a control circuit of an interleaved parallel Boost circuit. Background Art

[0002] When the Boost circuit works in critical mode, the circuit has the advantages of zero current turn-on and no reverse recovery. However, since the input current has a large current peak and current ripple, it is generally not applicable to high-power drive power supplies. At this time, an interleaved parallel Boost technology is widely used in high-power drive power supplies. The interleaved operation technology makes the working signal frequency of each unit consistent and the phase angles staggered, which can reduce the current peak and current ripple of the input current.

[0003] See also Figure 1 As shown, in the existing staggered parallel Boost circuit, an equal driving control signal is provided to each switch tube in the staggered parallel Boost main circuit 1 through the main control circuit 2, so that the current flowing through each path is equal; however, under the requirements of high quality and high reliability, the staggered parallel Boost circuit often causes unequal opening time of the driving control signal of each switch tube in high-temperature reliability work due to differences in component parameters used in each path, poor high-temperature characteristics of materials, etc., resulting in uneven current flowing through each path, thereby damaging the components and even causing the switch tube to explode due to overcurrent.

[0004] Therefore, how to keep the output current of the staggered parallel Boost circuit equal is a problem that needs to be solved at present. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a control circuit for an interleaved parallel Boost circuit, so that the output current of the interleaved parallel Boost circuit remains equal. The specific scheme is as follows:

[0006] A control circuit for an interleaved parallel Boost circuit, comprising a monitoring circuit;

[0007] The monitoring end of the monitoring circuit is connected to the monitoring point of the staggered parallel Boost main circuit, and is used to monitor the current signal in the switching cycle of each circuit in the staggered parallel Boost main circuit;

[0008] The input end of the monitoring circuit is connected to the output end of the staggered parallel Boost main circuit, and is used to receive the output voltage signal of the staggered parallel Boost main circuit;

[0009] The output terminal of the monitoring circuit is connected to the control terminal of the interleaved Boost main circuit, and is used to output an adjustable drive control signal to the interleaved Boost main circuit, so that the output currents of each circuit in the interleaved Boost main circuit are equal;

[0010] The monitoring circuit is used to generate a drive control signal by using the current signal of each circuit in the interleaved Boost main circuit and the output voltage signal.

[0011] Optionally, the monitoring circuit is a single-chip microcomputer;

[0012] The single-chip microcomputer is connected to the interleaved Boost main circuit. The single-chip microcomputer is used to obtain the current signal within the switching period of each circuit in the interleaved Boost main circuit and the output voltage signal, and output a drive control signal to control the interleaved Boost main circuit according to the output voltage signal and the current signal within the switching period of each circuit in the interleaved Boost main circuit, so that the output currents of each circuit in the interleaved Boost main circuit are equal.

[0013] Optionally, the monitoring circuit includes a main control circuit and a difference comparison circuit;

[0014] The monitoring terminal of the difference comparison circuit is connected to the monitoring point of the interleaved Boost main circuit, and the monitoring terminal is used to monitor the current signal within the switching period of each circuit in the interleaved Boost main circuit;

[0015] The output terminal of the difference comparison circuit is connected to the first input terminal of the main control circuit. The output terminal of the difference comparison circuit is used to output a difference comparison signal obtained by comparing the current signals of each circuit of the interleaved Boost main circuit monitored by the monitoring terminal to the main control circuit;

[0016] The first input terminal of the main control circuit is connected to the output terminal of the difference comparison circuit, and receives the difference comparison signal through the first input terminal. The second input terminal of the main control circuit is connected to the output terminal of the interleaved Boost main circuit, and receives the output voltage signal of the interleaved Boost main circuit through the second input terminal. The output terminal of the main control circuit is connected to the control terminal of the interleaved Boost main circuit, and is used to output a drive control signal to the interleaved Boost main circuit;

[0017] The main control circuit is used to generate multiple drive control signals according to the output voltage signal, and adjust the drive control signals according to the difference comparison signal, so that the output currents of each circuit in each interleaved Boost main circuit are equal.

[0018] Optionally, multiple output terminals of the main control circuit are respectively connected to control terminals of all paths of the interleaved parallel Boost main circuit, and each output terminal outputs a drive control signal corresponding to each path of circuit in the interleaved parallel Boost main circuit.

[0019] Optionally, the monitoring points of the interleaved parallel Boost main circuit are the input ends of inductors, the output ends of each path of circuit, or the output ends of switching tubes in each path of circuit in the interleaved parallel Boost main circuit.

[0020] Optionally, the interleaved parallel Boost main circuit includes a first circuit and a second circuit; both the first circuit and the second circuit include an inductor, a switching tube, a diode, and a resistor; the output end of the inductor is connected to the input end of the switching tube and the positive pole of the diode, and the output end of the switching tube is connected to the input end of the resistor; the input ends of the inductors in the first circuit and the second circuit are connected to each other, the output end of the resistor and the negative pole of the diode in the first circuit are connected to the output end of the resistor and the negative pole of the diode in the second circuit, and the control ends of the diodes in the first circuit and the second circuit are respectively connected to the output terminal of the main control circuit.

[0021] Optionally, the difference comparison circuit includes a first operational amplifier circuit, a second operational amplifier circuit, and a subtractor;

[0022] The first operational amplifier circuit includes a first operational amplifier and a first compensation circuit, and the second operational amplifier circuit includes a second operational amplifier and a second compensation circuit;

[0023] The first compensation circuit is connected in parallel between the negative input terminal and the output terminal of the first operational amplifier, and the second compensation circuit is connected in parallel between the negative input terminal and the output terminal of the second operational amplifier;

[0024] The negative input terminal of the first operational amplifier is connected to the monitoring point of the first circuit, the negative input terminal of the second operational amplifier is connected to the monitoring point of the second circuit, and the positive input terminals of the first operational amplifier and the second operational amplifier are respectively connected to obtain a first reference voltage and a second reference voltage;

[0025] The output terminals of the first operational amplifier and the second operational amplifier are respectively connected to the subtractor, and the output terminal of the subtractor is connected to the main control circuit;

[0026] The first operational amplifier circuit and the second operational amplifier circuit are respectively used to obtain voltage signals corresponding to the current signals of the switching tubes in the first circuit and the second circuit, and respectively generate and send corresponding comparison signals to the subtractor;

[0027] The subtractor is configured to perform a subtraction operation on the comparison signals output by the first operational amplifier circuit and the second operational amplifier circuit, generate a difference comparison signal, and send it to the main control circuit.

[0028] Optionally, the main control circuit includes a detection module, a feedback circuit, a sawtooth wave generation circuit, a first comparison circuit, a second comparison circuit, and a drive control circuit;

[0029] The detection module is connected to the output end of the subtractor, and is configured to generate and send a detection signal to the sawtooth wave generation circuit according to the difference comparison signal sent by the subtractor;

[0030] The feedback circuit is connected to the output end of the interleaved parallel Boost main circuit, and is configured to output a feedback signal to the first comparison circuit and the second comparison circuit by using the output voltage signal and the third reference voltage;

[0031] The first comparison circuit and the second comparison circuit are respectively connected to the sawtooth wave generation circuit and the feedback circuit. The first comparison circuit generates a first comparison signal by using the first sawtooth wave signal and the feedback signal sent by the sawtooth wave generation circuit and the feedback circuit, and the second comparison circuit generates a second comparison signal by using the second sawtooth wave signal and the feedback signal sent by the sawtooth wave generation circuit and the feedback circuit;

[0032] The drive control circuit is respectively connected to the control ends of the first circuit and the second circuit, and the drive control circuit is respectively connected to the output ends of the first comparison circuit and the second comparison circuit. The drive control circuit respectively generates a first drive control signal and a second drive control signal by using the first comparison signal and the second comparison signal, and respectively outputs the first drive control signal and the second drive control signal to the control ends of the first circuit and the second circuit, so that the output currents of each circuit in the interleaved parallel Boost main circuit are equal.

[0033] In the present invention, the control circuit of the interleaved parallel Boost circuit includes a monitoring circuit; the monitoring terminal of the monitoring circuit is connected to the monitoring point of the interleaved parallel Boost main circuit for monitoring the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit; the input terminal of the monitoring circuit is connected to the output terminal of the interleaved parallel Boost main circuit for receiving the output voltage signal of the interleaved parallel Boost main circuit; the output terminal of the monitoring circuit is connected to the control terminal of the interleaved parallel Boost main circuit for outputting an adjustable drive control signal to the interleaved parallel Boost main circuit to make the output currents of each circuit in the interleaved parallel Boost main circuit equal; the monitoring circuit is used to generate a drive control signal by using the current signal and the output voltage signal of each circuit in the interleaved parallel Boost main circuit.

[0034] In the present invention, the monitoring circuit obtains the current signals of each circuit in the interleaved parallel Boost main circuit and the output voltage signal of the interleaved parallel Boost main circuit, generates the drive control signals for controlling each circuit in the interleaved parallel Boost main circuit, and by transmitting the drive control signals to the control terminals of each circuit in the interleaved parallel Boost main circuit, controls each circuit to compensate for the current deviation generated by each circuit, ensures that the current signals output by each circuit in the interleaved parallel Boost main circuit are equal, improves the reliability of the circuit, and avoids the situation of unequal currents in each circuit, which ultimately leads to damage. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0036] Figure 1 is the interleaved parallel Boost circuit in the prior art;

[0037] Figure 2 is a control circuit of an interleaved parallel Boost circuit disclosed in an embodiment of the present invention;

[0038] Figure 3 is another control circuit of an interleaved parallel Boost circuit disclosed in an embodiment of the present invention;

[0039] Figure 4 is another control circuit of an interleaved parallel Boost circuit disclosed in an embodiment of the present invention;

[0040] Figure 5 is another control circuit of an interleaved parallel Boost circuit disclosed in an embodiment of the present invention;

[0041] Figure 6 Another control circuit for the interleaved parallel Boost circuit disclosed in the embodiments of the present invention;

[0042] Figure 7 Another control circuit for the interleaved parallel Boost circuit disclosed in the embodiments of the present invention. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0044] The embodiments of the present invention disclose a control circuit for an interleaved parallel Boost circuit. Refer to Figure 2 As shown, the circuit includes a monitoring circuit 2;

[0045] The monitoring end of the monitoring circuit 2 is connected to the monitoring point of the interleaved parallel Boost main circuit 1, and is used to monitor the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit 1;

[0046] The input end of the monitoring circuit 2 is connected to the output end of the interleaved parallel Boost main circuit 1, and is used to receive the output voltage signal V0 of the interleaved parallel Boost main circuit 1;

[0047] The output end of the monitoring circuit 2 is connected to the control end of the interleaved parallel Boost main circuit 1, and is used to output an adjustable drive control signal to the interleaved parallel Boost main circuit 1, so that the output currents of each circuit in the interleaved parallel Boost main circuit 1 are equal;

[0048] The monitoring circuit 2 is used to generate a drive control signal by using the current signal of each circuit in the interleaved parallel Boost main circuit 1 and the output voltage signal V0.

[0049] Specifically, by collecting the current signal of each circuit in the interleaved parallel Boost main circuit 1 and comparing it with the reference signal, a corresponding difference comparison signal can be obtained. Then, using this difference comparison signal and the output voltage signal V0 of the interleaved parallel Boost main circuit 1, a drive control signal for each circuit can be generated, thereby realizing the control of the interleaved parallel Boost main circuit 1, and enabling each circuit in the interleaved parallel Boost main circuit 1 to output the same current signal according to the drive control signal.

[0050] Specifically, the monitoring circuit 2 can generate a drive control signal using the output voltage signal V0, and then specifically adjust the generated drive control signal using the difference comparison signal. Finally, the adjusted drive control signal is sent to the interleaved Boost main circuit 1, so that each circuit in the interleaved Boost main circuit 1 outputs the same current signal according to the drive control signal.

[0051] It can be seen that in the embodiment of the present invention, the monitoring circuit 2 obtains the current signals of each circuit in the interleaved Boost main circuit 1 and the output voltage signal V0 of the interleaved Boost main circuit 1, generates a drive control signal for controlling each circuit in the interleaved Boost main circuit 1, and controls each circuit to compensate for the current deviation generated by each circuit by transmitting the drive control signal to the control end of each circuit in the interleaved Boost main circuit 1, ensuring that the current signals output by each circuit in the interleaved Boost main circuit 1 are equal, improving the reliability of the circuit, and avoiding the situation of unequal current in each path, which ultimately leads to damage.

[0052] The embodiment of the present invention discloses a specific control circuit for an interleaved Boost circuit. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically:

[0053] See Figure 3 As shown, in the embodiment of the present invention, the above-mentioned monitoring circuit 2 may include a main control circuit 21 and a difference comparison circuit 22;

[0054] The monitoring end of the difference comparison circuit 22 is connected to the interleaved Boost main circuit 1, and the monitoring end is used to monitor the current signal within the switching period of each circuit in the interleaved Boost main circuit 1;

[0055] The output end of the difference comparison circuit 22 is connected to the first input end of the main control circuit 21. The output end of the difference comparison circuit 22 is used to output a difference comparison signal obtained by comparing the current signals of each circuit in the interleaved Boost main circuit 1 monitored by the monitoring end to the main control circuit 21;

[0056] The first input end of the main control circuit 21 is connected to the output end of the difference comparison circuit 22. The main control circuit 21 receives the difference comparison signal through the first input end. The second input end of the main control circuit 21 is connected to the output end of the interleaved Boost main circuit 1. The main control circuit 21 receives the output voltage signal V0 of the interleaved Boost main circuit 1 through the second input end. The output end of the main control circuit 21 is connected to the control end of the interleaved Boost main circuit 1. The output end of the main control circuit 21 is used to output the drive control signal generated by the main control circuit 21 to the interleaved Boost main circuit 1;

[0057] The main control circuit 21 is configured to generate a plurality of drive control signals according to the output voltage signal V0, and adjust the drive control signals according to the difference comparison signal, so that the output currents of each circuit in each interleaved parallel Boost main circuit are equal.

[0058] Specifically, to ensure that the output currents of each path of the interleaved parallel Boost main circuit 1 are equal, a negative feedback form can be adopted to control the output currents of each circuit in the interleaved parallel Boost main circuit 1 to be equal. For this purpose, the main control circuit 21 and the difference comparison circuit 22 can be added to achieve this.

[0059] Among them, to achieve feedback control so that the output currents of each circuit in the interleaved parallel Boost main circuit 1 are equal, the difference comparison circuit 22 collects the current signals output by each path of the interleaved parallel Boost main circuit 1. The monitoring terminal of the difference comparison circuit 22 is connected to the monitoring point of the interleaved parallel Boost main circuit 1. The monitoring point of the interleaved parallel Boost main circuit 1 is the input end of the inductor in each circuit of the interleaved parallel Boost main circuit 1, the output end of each circuit, or the output end of the switching tube in each circuit. It can be understood that when the interleaved parallel Boost main circuit 1 includes multiple circuits, the difference comparison circuit 22 also includes multiple monitoring terminals, so that the monitoring terminals correspond to each circuit in the interleaved parallel Boost main circuit 1 one by one, and the connection points of each monitoring terminal to the monitoring point in each circuit are the same. For example, taking the monitoring point of the interleaved parallel Boost main circuit 1 as the output end of the switching tube in each circuit, all the monitoring terminals are connected to the output end of the switching tube in each circuit, and there will be no situation where different monitoring terminals are connected to different types of monitoring points. For example, the first monitoring terminal is connected to the output end of the switching tube in the first circuit of the interleaved parallel Boost main circuit 1, then the second monitoring terminal is connected to the output end of the switching tube in the second circuit of the interleaved parallel Boost main circuit 1, and there will be no situation where the second monitoring terminal is connected to the output end of the second circuit of the interleaved parallel Boost main circuit 1.

[0060] Specifically, after the difference comparison circuit 22 collects the current signals output by each path of the interleaved parallel Boost main circuit 1, the current signal of each path in the interleaved parallel Boost main circuit 1 will be compared with the corresponding reference signal in the difference comparison circuit 22 to obtain a difference comparison signal, and the difference comparison circuit 22 outputs the difference comparison signal to the main control circuit 21.

[0061] It can be understood that when the current signal of each path in the interleaved parallel Boost main circuit 1 fluctuates, a comparison signal will be generated between it and the reference signal. A difference will be generated between the comparison signals of each path. Based on this difference, a difference comparison signal will be generated. After the main control circuit 21 generates the drive control signal according to the output voltage signal V0, it can adjust the corresponding drive control signal according to the difference recorded in the difference comparison signal to drive each circuit in the interleaved parallel Boost main circuit 1 so that the current output by each circuit is equal.

[0062] Among them, to ensure that the main control circuit 21 can use the difference comparison signal to control the equal current output of each circuit in the interleaved parallel Boost main circuit 1, the reference signal of the difference comparison circuit 22 can be set according to actual application requirements to ensure the equal current output of each circuit in the interleaved parallel Boost main circuit 1.

[0063] Specifically, after the main control circuit 21 obtains the output voltage signal V0, it generates drive control signals corresponding to each circuit in the interleaved parallel Boost main circuit 1, then uses the difference comparison signal to adjust the drive control signals corresponding to each circuit in the interleaved parallel Boost main circuit 1, and finally sends each drive control signal to the control ends of the corresponding circuits respectively, driving the corresponding switching tubes to switch according to the corresponding drive control signals, so as to control the output current of each circuit, making the current signals output by each circuit equal, avoiding unequal current, so as to prevent component damage and even the phenomenon of overcurrent explosion of the switching tubes.

[0064] It should be noted that the interleaved parallel Boost main circuit 1 can include multiple paths of circuits. For example, two paths of circuits or four paths of circuits. At this time, the corresponding main control circuit 21 also includes multiple output ends respectively connected to the control ends of each path of the interleaved parallel Boost main circuit 1. Each output end outputs drive control signals corresponding to each path of circuits in the interleaved parallel Boost main circuit 1, and the drive control signals received by each path of circuits may all be different.

[0065] It can be understood that the difference comparison signal is based on the current signals of each path of circuits in the interleaved parallel Boost main circuit 1. Therefore, the drive control signals corresponding to each circuit can be obtained by using the difference comparison signal.

[0066] It can be understood that in practical applications, due to the principle of negative feedback, the current signals output by each circuit in the interleaved parallel Boost main circuit 1 are not exactly the same at the same moment. However, through the difference comparison circuit 22 and the main control circuit 21, the difference between the current signals output by each circuit in the interleaved parallel Boost main circuit 1 at the same moment can be controlled within a certain preset range. For example, the difference between the current signals of each circuit can be within a few milliamperes. At this time, such a small deviation can be ignored, meeting the requirements of practical applications, and the current signals output by each circuit in the interleaved parallel Boost main circuit 1 can be regarded as the same.

[0067] It can be seen that in the embodiment of the present invention, a difference comparison circuit 22 is added to obtain the current signals of each circuit in the interleaved parallel Boost main circuit 1, and a difference comparison signal is generated based on the current signals of each circuit. The main control circuit 21 generates corresponding drive control signals according to the difference comparison signal to control each circuit, thereby compensating for the current deviation generated by each circuit, ensuring that the current signals output by each circuit in the interleaved parallel Boost main circuit 1 are equal, improving the reliability of the circuit, and avoiding the situation of unequal current in each circuit, which ultimately leads to damage.

[0068] Furthermore, the embodiment of the present invention also discloses a specific control circuit for an interleaved parallel Boost circuit. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically:

[0069] Specifically, as shown in Figure 4 the above-mentioned interleaved parallel Boost main circuit 1 may include a first circuit 11 and a second circuit 12; both the first circuit 11 and the second circuit 12 include inductors (L1, L2), switching tubes (S1, S2), diodes (D1, D2), and resistors (R1, R2); the output ends of the inductors (L1, L2) are connected to the input ends of the switching tubes (S1, S2) and the anodes of the diodes (D1, D2), and the output ends of the switching tubes (S1, S2) are connected to the input ends of the resistors (R1, R2); the input ends of the inductors (L1, L2) in the first circuit 11 and the second circuit 12 are connected to each other, the output end of the resistor R1 in the first circuit 11 is connected to the output end of the resistor R2 in the second circuit 12, the cathodes of the diodes D1 in the first circuit 11 are connected to the cathodes of the diodes D2 in the second circuit 12, and the control ends of the switching tubes (S1, S2) in the first circuit 11 and the second circuit 12 are respectively connected to the output end of the main control circuit 21.

[0070] It should be noted that as shown in Figure 4As shown, only when the monitoring points of the interleaved boost main circuit 1 are the input ends of the inductors (L1, L2), protection resistors (R3 and R4) as shown by the dotted lines in the figure need to be added to the input ends of the inductors (L1, L2). Only when the monitoring points of the interleaved boost main circuit 1 are the output ends of each path, protection resistors (R5 and R6) as shown by the dotted lines in the figure need to be added.

[0071] Specifically, refer to Figure 5 As shown, the above-mentioned difference comparison circuit 22 may include a first operational amplifier circuit 221, a second operational amplifier circuit 222, and a subtractor 223;

[0072] The first operational amplifier circuit 221 includes a first operational amplifier U1 and a first compensation circuit 2211, and the second operational amplifier circuit 222 includes a second operational amplifier U2 and a second compensation circuit 2221;

[0073] The first compensation circuit 2211 is connected in parallel between the negative input terminal and the output terminal of the first operational amplifier U1, and the second compensation circuit 2221 is connected in parallel between the negative input terminal and the output terminal of the second operational amplifier U2;

[0074] The negative input terminal of the first operational amplifier U1 is connected to the monitoring point of the first circuit 11, the negative input terminal of the second operational amplifier U2 is connected to the monitoring point of the second circuit 12, and the positive input terminals of the first operational amplifier U1 and the second operational amplifier U2 are respectively connected to obtain the first reference voltage Vref1 and the second reference voltage Vref2;

[0075] The output terminals of the first operational amplifier U1 and the second operational amplifier U2 are respectively connected to the subtractor 223, and the output terminal of the subtractor 223 is connected to the main control circuit 21;

[0076] The first operational amplifier circuit 221 and the second operational amplifier circuit 222 are respectively used to obtain voltage signals corresponding to the current signals of the switching tubes (S1, S2) of the first circuit 11 and the second circuit 12, and respectively generate and send corresponding comparison signals to the subtractor 223;

[0077] The subtractor 223 is used to perform a subtraction operation on the comparison signals output by the first operational amplifier circuit 221 and the second operational amplifier circuit 222, generate a difference comparison signal, and send the difference comparison signal to the main control circuit 21.

[0078] It should be noted that compared with the acquisition of current signals, the acquisition of voltage signals is more convenient. Also, because there is a corresponding conversion relationship between voltage signals and current signals, the first operational amplifier U1 and the second operational amplifier U2 acquire voltage signals corresponding to the current signals of the switching tubes (S1, S2), and compare them. Similarly, a corresponding differential comparison signal can be obtained, which has the same effect as directly acquiring current signals, and then controls the interleaved parallel Boost main circuit 1.

[0079] Specifically, the first operational amplifier U1 samples the voltage signal of the first switching tube S1 on the first circuit 11 of the interleaved parallel Boost main circuit 1. This voltage signal is related to the current flowing through the first switching tube S1 on this path. The voltage signal of the first switching tube S1 is compared with the internal reference voltage Vref1 of the first operational amplifier U1, and the first comparison signal V6 is output and supplied to the subtractor 223. The second operational amplifier U2 samples the voltage signal of the second switching tube S2 on the second circuit 12 of the interleaved parallel Boost main circuit 1. This voltage signal is related to the current flowing through the second switching tube S2 on this path. The voltage signal of the second switching tube S2 is compared with the internal reference voltage Vref2 of the operational amplifier, and the second comparison signal V7 is output and supplied to the subtractor 223. The subtractor 223 performs a subtraction operation on the first comparison signal and the second comparison signal to obtain a differential comparison signal V8 and provide it to the main control circuit 21. The main control circuit 21 adjusts the drive control signals of the two-way outputs according to the magnitude of the differential comparison signal V8, so that the current flowing through each path in the interleaved parallel Boost main circuit 1 is equal.

[0080] Specifically, referring to Figure 6 As shown, the above-mentioned main control circuit 21 may include a detection module 211, a feedback circuit 212, a sawtooth wave generation circuit 213, a first comparison circuit 214, a second comparison circuit 215, and a drive control circuit 216;

[0081] The detection module 211 is connected to the output end of the subtractor 223, and is used to generate and send a detection signal to the sawtooth wave generation circuit 213 according to the differential comparison signal sent by the subtractor 223;

[0082] The feedback circuit 212 is connected to the output end of the interleaved parallel Boost main circuit 1, and is used to output a feedback signal V1 to the first comparison circuit 214 and the second comparison circuit 215 by using the output voltage signal V0 and the third reference voltage Verf3;

[0083] The first comparison circuit 214 and the second comparison circuit 215 are respectively connected to the sawtooth wave generation circuit 213 and the feedback circuit 212. The first comparison circuit 214 generates a first comparison signal V4 by using the first sawtooth wave signal V2 and the feedback signal V1 sent by the sawtooth wave generation circuit 213 and the feedback circuit 212. The second comparison circuit 215 generates a second comparison signal V5 by using the second sawtooth wave signal V3 and the feedback signal V1 sent by the sawtooth wave generation circuit 213 and the feedback circuit 212.

[0084] The drive control circuit 216 is respectively connected to the control ends of the first circuit 11 and the second circuit 12. The drive control circuit 216 is respectively connected to the output ends of the first comparison circuit 214 and the second comparison circuit 215. The drive control circuit 216 respectively generates a first drive control signal DRV1 and a second drive control signal DRV2 by using the first comparison signal V4 and the second comparison signal V5, and respectively outputs the first drive control signal DRV1 and the second drive control signal DRV2 to the control ends of the first circuit 11 and the second circuit 12, so that the output currents of the circuits in the interleaved parallel Boost main circuit 1 are equal.

[0085] Specifically, the feedback circuit 212 performs proportional calculation according to the output voltage signal V0 and the internal reference signal Vref3 to obtain a feedback signal V1 related to the output voltage and supplies it to the first comparison circuit 214 and the second comparison circuit 215.

[0086] Specifically, the sawtooth wave generation circuit 213 outputs sawtooth wave signals V2 and V3 with different Ton times according to the input detection signal.

[0087] Specifically, the first comparison circuit 214 and the first comparison circuit 214 receive the feedback signal V1 and respectively receive the sawtooth wave signal V2 and the sawtooth wave signal V3, and output comparison signals V4 and V5 to supply to the drive control circuit 216.

[0088] Specifically, the drive control circuit 216 respectively outputs interleaved drive control signals DRV1 and DRV2 according to the two input comparison signals V4 and V5, and respectively drives the on and off of the switching tubes S1 and S2 of the interleaved parallel Boost circuit, so that the interleaved parallel Boost main circuit 1 outputs a stable DC voltage Vo;

[0089] Among them, when the difference comparison circuit 22 adopts as Figure 5When the difference comparison circuit 22 is as shown, after the difference comparison circuit 22 outputs a difference comparison signal V8 using the first comparison signal V6 and the second comparison signal V7, the Ton time of the drive control signals DRV1 and DRV2 is determined by the Ton time of the sawtooth signals V2 and V3; that is, when the Ton time of the sawtooth signal V2 is greater than the Ton time of the sawtooth signal V3, the Ton time of the drive control signal DRV1 is greater than the Ton time of the drive control signal DRV2, when the Ton time of the sawtooth signal V2 is equal to the Ton time of the sawtooth signal V3, the Ton time of the drive control signal DRV1 is equal to the Ton time of the drive control signal DRV2, and when the Ton time of the sawtooth signal V2 is less than the Ton time of the sawtooth signal V3, the Ton time of the drive control signal DRV1 is less than the Ton time of the drive control signal DRV2.

[0090] Further, the detection module 211 is configured to, when detecting that the difference comparison signal is less than 0, it indicates that the current flowing through the switching transistor S1 is greater than the current flowing through the switching transistor S2; or when the detection module 211 detects that the difference comparison signal is equal to 0, it indicates that the current flowing through the switching transistor S1 is equal to the current flowing through the switching transistor S2; or when the detection module 211 detects that the difference comparison signal is greater than 0, it indicates that the current flowing through the switching transistor S1 is greater than the current flowing through the switching transistor S2;

[0091] When the difference comparison signal is equal to 0, the detection module 211 does not output a detection signal, that is, the sawtooth wave generation circuit 213 does not make an adjustment and outputs according to the original setting; or when the difference comparison signal is greater than 0 or less than 0, the detection module 211 outputs a detection signal to the sawtooth wave generation circuit 213.

[0092] Among them, the output detection signal can represent keeping the drive control signal of the switching transistor S1 unchanged and increasing or decreasing the Ton time of the drive control signal of the switching transistor S2, or represent keeping the drive control signal of the switching transistor S2 unchanged and increasing or decreasing the Ton time of the drive control signal of the switching transistor S1, or represent simultaneously adjusting the drive control signals of the switching transistors S1 and S2 to increase or decrease.

[0093] Of course, the judgment order of the switching transistors S1 and S2 can be reversed. For example, when detecting that the difference comparison signal is less than 0, it indicates that the current flowing through the switching transistor S2 is greater than the current flowing through the switching transistor S1. The specific situation is set according to the actual application scenario and is not limited here.

[0094] In addition, the embodiment of the present invention also discloses a control circuit for an interleaved parallel Boost circuit. Refer to Figure 7 As shown, the circuit monitoring circuit 2 is a single-chip microcomputer 3;

[0095] The single-chip microcomputer 3 is connected to the interleaved parallel Boost main circuit 1. The single-chip microcomputer 3 is used to obtain the current signal and the output voltage signal V0 within the switching period of each circuit in the interleaved parallel Boost main circuit 1, and output a drive control signal to control the interleaved parallel Boost main circuit 1 according to the output voltage signal V0 and the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit 1, so that the output currents of each circuit in the interleaved parallel Boost main circuit 1 are equal.

[0096] Specifically, the single-chip microcomputer 3 is used to generate and output two interleaved drive signals according to the output voltage signal V0 and the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit 1, and provide them to the two switching tubes S1 and S2 of the interleaved parallel Boost main circuit 1 to control the interleaved on and off of the two switching tubes S1 and S2, so that the interleaved parallel Boost main circuit 1 outputs a stable DC voltage Vo.

[0097] Specifically, the single-chip microcomputer 3 circuit includes two input detection terminals A1 and A2. The two detection terminals respectively detect the current signals flowing through each switching tube S1 and S2 in the interleaved parallel Boost main circuit 1. The single-chip microcomputer 3 also adjusts the two interleaved drive signals DRV1 and DRV2 output by the main control circuit 21 period by period according to the magnitudes of the voltage signals corresponding to the current signals of the switching tubes S1 and S2 indirectly detected by the detection terminals, so that the current signals input by the two detection terminals are equal.

[0098] It can be understood that the adjustment method includes keeping the drive signal of the switching tube S1 unchanged, increasing or decreasing the Ton time of the drive signal of the switching tube S2, or keeping the drive signal of the switching tube S2 unchanged, increasing or decreasing the Ton time of the drive signal of the switching tube S1, or adjusting the drive signals of the switching tubes S1 and S2 to increase or decrease simultaneously.

[0099] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0100] Those skilled in the art may further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0101] The above has introduced the technical content provided by the present invention in detail. Specific examples have been used herein to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A control circuit for an interleaved parallel Boost circuit, characterized in that including a monitoring circuit; The monitoring end of the monitoring circuit is connected to the monitoring point of the interleaved parallel Boost main circuit, and is used to monitor the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit; The input end of the monitoring circuit is connected to the output end of the interleaved parallel Boost main circuit, and is used to receive the output voltage signal of the interleaved parallel Boost main circuit; The output end of the monitoring circuit is connected to the control end of the interleaved parallel Boost main circuit, and is used to output an adjustable drive control signal to the interleaved parallel Boost main circuit, so that the output currents of each circuit within the interleaved parallel Boost main circuit are equal; The monitoring circuit is used to generate a drive control signal by using the current signal of each circuit in the interleaved parallel Boost main circuit and the output voltage signal; Wherein, the monitoring circuit includes a main control circuit and a difference comparison circuit; The interleaved parallel Boost main circuit includes a first circuit and a second circuit; The difference comparison circuit includes a first operational amplifier circuit, a second operational amplifier circuit and a subtractor; the subtractor is used to perform a subtraction operation on the comparison signals output by the first operational amplifier circuit and the second operational amplifier circuit to generate a difference comparison signal, and send it to the main control circuit; The main control circuit includes a detection module, a feedback circuit, a sawtooth wave generation circuit, a first comparison circuit, a second comparison circuit and a drive control circuit; The detection module is connected to the output end of the subtractor, and is used to generate and send a detection signal to the sawtooth wave generation circuit according to the difference comparison signal sent by the subtractor; The feedback circuit is connected to the output end of the interleaved parallel Boost main circuit, and is used to output a feedback signal to the first comparison circuit and the second comparison circuit by using the output voltage signal and the third reference voltage; The first comparison circuit and the second comparison circuit are respectively connected to the sawtooth wave generation circuit and the feedback circuit. The first comparison circuit uses the first sawtooth wave signal and the feedback signal sent by the sawtooth wave generation circuit and the feedback circuit to generate a first comparison signal. The second comparison circuit uses the second sawtooth wave signal and the feedback signal sent by the sawtooth wave generation circuit and the feedback circuit to generate a second comparison signal; The drive control circuit is respectively connected to the control ends of the first circuit and the second circuit. The drive control circuit is respectively connected to the output ends of the first comparison circuit and the second comparison circuit. The drive control circuit respectively uses the first comparison signal and the second comparison signal to generate a first drive control signal and a second drive control signal, and respectively outputs the first drive control signal and the second drive control signal to the control ends of the first circuit and the second circuit, so that the output currents of each circuit within the interleaved parallel Boost main circuit are equal.

2. The control circuit of the interleaved parallel Boost circuit according to claim 1, wherein The monitoring circuit is a single-chip microcomputer; The microcontroller is connected to the interleaved parallel Boost main circuit. The microcontroller is used to obtain the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit and the output voltage signal, and output a drive control signal to control the interleaved parallel Boost main circuit according to the output voltage signal and the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit, so that the output currents of each circuit in the interleaved parallel Boost main circuit are equal.

3. The control circuit of the interleaved parallel Boost circuit according to claim 1, characterized in that, The monitoring end of the difference comparison circuit is connected to the monitoring point of the interleaved parallel Boost main circuit. The monitoring end is used to monitor the current signal within the switching period of each circuit in the interleaved parallel Boost main circuit; The output end of the difference comparison circuit is connected to the first input end of the main control circuit. The output end of the difference comparison circuit is used to output a difference comparison signal obtained by comparing the current signals of each circuit of the interleaved parallel Boost main circuit monitored by the monitoring end to the main control circuit; The first input end of the main control circuit is connected to the output end of the difference comparison circuit, and receives the difference comparison signal through the first input end. The second input end of the main control circuit is connected to the output end of the interleaved parallel Boost main circuit, and receives the output voltage signal of the interleaved parallel Boost main circuit through the second input end. The output end of the main control circuit is connected to the control end of the interleaved parallel Boost main circuit, and is used to output a drive control signal to the interleaved parallel Boost main circuit; The main control circuit is used to generate multiple drive control signals according to the output voltage signal, and adjust the drive control signals according to the difference comparison signal, so that the output currents of each circuit in each interleaved parallel Boost main circuit are equal.

4. The control circuit of the interleaved parallel Boost circuit according to claim 3, characterized in that, Multiple output ends of the main control circuit are respectively connected to the control ends of each circuit of the interleaved parallel Boost main circuit, and each output end respectively outputs a drive control signal corresponding to each circuit in the interleaved parallel Boost main circuit.

5. The control circuit of the interleaved parallel Boost circuit according to claim 3, wherein The monitoring point of the interleaved parallel Boost main circuit is the input end of the inductor, the output end of each circuit, or the output end of the switch tube in each circuit of the interleaved parallel Boost main circuit.

6. The control circuit of the interleaved parallel Boost circuit according to any one of claims 3 to 5, characterized in that, Both the first circuit and the second circuit include an inductor, a switch tube, a diode, and a resistor; the output end of the inductor is connected to the input end of the switch tube and the positive pole of the diode, and the output end of the switch tube is connected to the input end of the resistor; the input ends of the inductors in the first circuit and the second circuit are connected to each other, the output end of the resistor and the negative pole of the diode in the first circuit are connected to the output end of the resistor and the negative pole of the diode in the second circuit, and the control ends of the diodes in the first circuit and the second circuit are respectively connected to the output end of the main control circuit.

7. The control circuit of the interleaved parallel Boost circuit according to claim 6, wherein The first operational amplifier circuit includes a first operational amplifier and a first compensation circuit, and the second operational amplifier circuit includes a second operational amplifier and a second compensation circuit; The first compensation circuit is connected in parallel between the negative input terminal and the output terminal of the first operational amplifier, and the second compensation circuit is connected in parallel between the negative input terminal and the output terminal of the second operational amplifier; The negative input terminal of the first operational amplifier is connected to the monitoring point of the first circuit, the negative input terminal of the second operational amplifier is connected to the monitoring point of the second circuit, and the positive input terminals of the first operational amplifier and the second operational amplifier are respectively connected to obtain a first reference voltage and a second reference voltage; The output terminals of the first operational amplifier and the second operational amplifier are respectively connected to the subtractor, and the output terminal of the subtractor is connected to the main control circuit; The first operational amplifier circuit and the second operational amplifier circuit are respectively used to obtain voltage signals corresponding to the current signals of the switching tubes of the first circuit and the second circuit, and respectively generate and send corresponding comparison signals to the subtractor.

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