Multiphase Buck phase cutting control circuit

Abstract

The utility model relates to the field of circuit devices, and discloses a multi-phase Buck phase cutting control circuit, which comprises two comparators X1 and X2 which are mainly used for comparing two voltage signals and outputting a digital signal to indicate which input voltage is higher, and two inverters U1 and U2 which are mainly used for inverting the input digital signal, that is to say, the two inverters U1 and U2 are used for outputting a digital signal to indicate which input voltage is higher. If the input is a high level, the output is a low level and vice versa, the three AND gates U3, U4 and U5 have the main effects that the output is the high level (logic 1) only when all the inputs are the high level (logic 1), and if any one of the inputs is the low level (logic 0), the output is the low level (logic 0), the threshold voltage of the comparator X1 is 0.2 V, and the threshold voltage of the comparator X2 is 0.5 V. According to the utility model, the circuit is simple and the cost is low; the multi-phase Buck phase cutting control circuit is realized in an analog mode and is high in reliability.

Description

Technical Field

[0001] The utility model relates to the field of circuit devices, and in particular to a multi-phase Buck phase-cut control circuit. Background Art

[0002] Multiphase buck circuits, due to their high reliability and bidirectional power flow, are increasingly being adopted as core technology solutions in products such as waveform generators and energy storage converters. When the load of a multiphase buck circuit is reduced, for example, to less than 50% of the rated load, only two phases need to operate simultaneously to meet the requirements. When the load drops below 20% of the rated load, only one phase is required. In other words, the greater the load, the more phases are required to operate in a multiphase buck circuit; the lighter the load, the fewer phases are required.

[0003] Although the existing technology uses DSP chips in conjunction with software algorithms to implement phase-cutting control, the software algorithm detects the load size and then closes or opens a phase according to the algorithm set by the software. However, the solution is complex and requires software code writing. In addition, the cost of DSP chips is high, resulting in a long development cycle, difficulty in debugging, and high cost of the entire control circuit. Therefore, those skilled in the art have provided a multi-phase Buck phase-cutting control circuit to solve the problems raised in the above background technology. Utility Model Content

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multi-phase Buck phase-cut control circuit, which provides a circuit that is simple, low-cost, and is implemented in an analog manner and has high reliability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-phase Buck phase-cut control circuit, comprising:

[0006] The two comparators X1 and X2 compare two voltage signals and output a digital signal to indicate which input voltage is higher.

[0007] The two inverters U1 and U2 are used to invert the input digital signal, that is, if the input is high, the output is low, and vice versa;

[0008] The three AND gates U3, U4 and U5 have the main function of outputting a high level (logic 1) only when all inputs are high (logic 1). If any input is low (logic 0), the output will be low (logic 0).

[0009] By the above technical scheme, only 2 comparators, 2 inverters, 3 AND gates, a plurality of resistors and capacitors can constitute the multi-phase Buck phase-cut control circuit in an analog mode.

[0010] Further, the threshold voltage of the comparator X1 is 0.2V, and the threshold voltage of the comparator X2 is 0.5V.

[0011] By the above technical scheme, the circuit is effectively controlled.

[0012] Further, one end of the comparator X1 is electrically connected with one end of the inverter U1, and the other end of the inverter U1 is electrically connected with the AND gate U5.

[0013] By the above technical scheme, the comparator X1 is effectively installed.

[0014] Further, one end of the comparator X2 is electrically connected with one end of the inverter U2, one end of the inverter U2 is electrically connected with one end of the AND gate U3, and one end of the AND gate U3 is electrically connected with the AND gate U4.

[0015] By the above technical scheme, the comparator X2 is effectively installed.

[0016] Further, a plurality of resistors and capacitors are arranged in the circuit.

[0017] By the above technical scheme, the circuit is effectively protected.

[0018] Further, the other end of the comparator X1 is electrically connected with the resistor R2 and grounded.

[0019] By the above technical scheme, the safety of the comparator X1 in use is effectively improved.

[0020] Further, the other end of the comparator X2 is electrically connected with the resistor R10 and grounded.

[0021] By the above technical scheme, the safety of the comparator X2 in use is effectively improved.

[0022] The utility model has the advantages of:

[0023] 1. In the utility model, only 2 comparators, 2 inverters, 3 AND gates, a plurality of resistors and capacitors can constitute the multi-phase Buck phase-cut control circuit in an analog mode.

[0024] 2. In the utility model, the circuit is simple and low in cost, and is reliable in analog mode. DRAWINGS

[0025] Figure 1This is a circuit diagram of a multi-phase Buck phase-cut control circuit proposed in the utility model. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Reference Figure 1 The present invention provides an embodiment of a multi-phase Buck phase-cut control circuit, comprising: two comparators X1 and X2, whose main function is to compare two voltage signals and output a digital signal to indicate which input voltage is higher; two inverters U1 and U2, whose main function is to invert the input digital signal, that is, if the input is high, the output is low, and vice versa; three AND gates U3, U4 and U5, whose main function is to output a high level (logic 1) only when all inputs are high (logic 1); if any input is low (logic 0), the output is low (logic 0). Only two comparators, two inverters, three AND gates, and several resistors and capacitors are needed to form an analog multi-phase Buck phase-cut control circuit. The circuit is simple and low-cost; it is implemented in an analog manner and has high reliability.

[0028] The threshold voltage of comparator X1 is 0.2V, and the threshold voltage of comparator X2 is 0.5V. One end of comparator X1 is electrically connected to one end of inverter U1, and the other end of inverter U1 is electrically connected to AND gate U5. One end of comparator X2 is electrically connected to one end of inverter U2, and the other end of inverter U2 is electrically connected to one end of AND gate U3, and one end of AND gate U3 is electrically connected to AND gate U4. Several resistors and capacitors are provided in the circuit. The other end of comparator X1 is electrically connected to resistor R2 and grounded, and the other end of comparator X2 is electrically connected to resistor R10 and grounded.

[0029] Working principle: When the error amplifier output voltage is lower than 0.5V, comparator X2 outputs a high level, which passes through inverter U2 and AND gates U3 and U4 to block the 2nd and 4th phase drive pulses. When the error amplifier output voltage continues to decrease and is lower than 0.2V, comparator X1 outputs a high level, which passes through inverter U1 and AND gate U5 to block the 3rd drive pulse. Only 2 comparators, 2 inverters, 3 AND gates, and several resistors and capacitors are needed to form an analog multi-phase Buck phase-cutting control circuit. The circuit is simple and low-cost; it is implemented in an analog way and has high reliability.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-phase Buck phase-cut control circuit, characterized by: include: The two comparators X1 and X2 compare two voltage signals and output a digital signal to indicate which input voltage is higher. The two inverters U1 and U2 are used to invert the input digital signal, that is, if the input is high, the output is low, and vice versa; The main function of the three AND gates U3, U4 and U5 is that the output is high level (logic 1) only when all inputs are high level (logic 1). If any input is low level (logic 0), the output is low level (logic 0).

2. The multi-phase Buck phase-cut control circuit according to claim 1, characterized in that: The threshold voltage of the comparator X1 is 0.2V, and the threshold voltage of the comparator X2 is 0.5V.

3. The multi-phase Buck phase-cut control circuit according to claim 1, characterized in that: One end of the comparator X1 is electrically connected to one end of the inverter U1 , and the other end of the inverter U1 is electrically connected to the AND gate U5 .

4. The multi-phase Buck phase-cut control circuit according to claim 1, characterized in that: One end of the comparator X2 is electrically connected to one end of the inverter U2 , the other end of the inverter U2 is electrically connected to one end of the AND gate U3 , and one end of the AND gate U3 is electrically connected to the AND gate U4 .

5. The multi-phase Buck phase-cut control circuit according to claim 1, characterized in that: The circuit is provided with a plurality of resistors and capacitors.

6. The multi-phase Buck phase-cut control circuit according to claim 1, characterized in that: The other end of the comparator X1 is electrically connected to the resistor R2 and grounded.

7. The multi-phase Buck phase-cut control circuit according to claim 1, characterized in that: The other end of the comparator X2 is electrically connected to the resistor R10 and grounded.

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